Spring Test Probe Description:
ICT/FCT spring test probe
Specifications:
Current: 0.5A to 7.0A, customizable
Contact resistance:<20 mΩ (typical value)
Working stroke: 0.10mm to 6.00mm (short stroke for precision pads, long travel to overcome height changes)
Barrel diameter: 0.25mm to 2.30mm (e.g., fine pitch for high-density PCB)
Working life: 50,000 to 500,000 cycles (depending on spring test probe model)
Functional applications + key performance + compatibility:
Applications:
Online Testing (ICT), Boundary Scan, Circuit Board Functional Testing (FCT), Battery Connection
Key Performance:
High reliability contact: Gold-plated structure ensures low and stable long-term contact resistance.
Self-cleaning function: The patented SUS631 spring design can puncture the oxide layer and improve testing yield.
Anti-solder residue: Special plunger tip design to prevent blockage and contamination.
Compatibility:
Spacing compatibility: Perfectly compatible with pin spacing of 0.4mm and above.
Fixture compatibility: Standard size, plug and play with mainstream testing fixtures (such as TR, M3 series).
Interface compatibility: Provides multiple plunger tip styles (pointed, coronal, flat, etc.) to match PCB pads, vias, and test points.
Core values: Ensure testing coverage and reliability, maximize first pass rate, reduce misjudgment and maintenance costs.
Challenges and Solutions of ICT/FCT spring test probe:
Micro spacing and high-density
Challenge: PCB layouts are becoming increasingly compact, with test point spacing as low as 0.2mm. Traditional spring test probes are prone to short circuits, misalignment, or damage to adjacent components due to physical interference.
Solution: Ultra fine diameter, high rigidity, coaxial shielding design.
- Using an extremely thin plunger tip with a diameter of 0.10mm and an ultra-thin wall of 0.15mm barrel, interference-free testing is achieved.
- The materials used are beryllium copper, tungsten copper, SK4, and optimized heat treatment process. Ensure that the barrel has extremely high bending strength and its lifespan is not reduced.
- Integrated coaxial shielding structure can effectively suppress signal crosstalk and attenuation when detecting small RF or high-frequency test points, ensuring signal integrity.
Low contact resistance and high stability
Challenge: Unstable contact resistance is the main cause of misjudgment and NDF due to oxidation, pollution, and pressure fluctuations. Serious impact on testing throughput and reliability.
Solution: Self-cleaning, coating and Hengli technology.
- The spring test probe tip adopts a sharp pointed tip, pyramid-shaped, and coronal-shape. It can puncture the oxide layer and pollutants on the surface of the test point during each contact, achieving self-cleaning.
- The coating is made of high wear-resistant gold Au or palladium cobalt Pd-Co alloy. While ensuring ultra-low and stable contact resistance of the spring test probe, it greatly extends its wear resistance life.
- Precise spring design and SUS631 spring provide stable and repeatable contact pressure. Ensure that the resistance value of the spring test probe is highly consistent with each contact.
Extreme lifespan and maintenance costs
Challenge: Spring test probes need to withstand millions of impacts on high-speed automated production lines. Frequent replacement can lead to testing downtime and high maintenance costs.
Solution: Ultra long lifespan design and modular replacement.
- Collaborative design of spring test probe from three dimensions: ultra-strong spring wire, optimized stroke and stress distribution, and solid long-term lubrication. Increase its nominal lifespan from the traditional 50,000 cycles to 500,000 cycles or even more.
- Provide modular probe heads or spring test probe kits for quick replacement. Allow engineers to replace the entire testing module without shutting down or in a very short period of time, minimizing the average repair time.
Why Choose Johoty’s Spring Test Probe?
Johoty’s spring test probe hase >10 shapes of plunger tip, flexible custom of length, stroke, diameter, current, spring force, etc. Johoty is your trust partner!
Spring Test Probe Benefits:
Addressing the challenges of high-density and high-speed testing
Engineer’s Challenge:
Electronic products are moving towards high-frequency and high-speed 5G, high-speed SerDes, PCIe, and spring test probes are no longer just simple conduction tools. Weak impedance mismatch, high contact resistance, or signal attenuation can all lead to distorted test results. Customers are unable to accurately distinguish between good and defective products, even causing high-performance design to fail.
Johoty brings you huge benefits:
Extremely low contact resistance and high stability: Johoty’s ICT/FCT spring test probe uses a high wear-resistant gold coating. Maintain stable contact resistance in the milliohm range after millions of tests. Your test data is always highly reliable with extremely low misjudgment rates.
Optimized impedance matching and low inductance design: For high-frequency applications, Johoty provides coaxial spring test probes and spring test probes with specific impedance values. This can minimize signal reflection and attenuation to the greatest extent possible, ensuring that real signals can still be captured in GHz level testing.
Excellent current carrying capacity: For high current burning tests, Johoty’s ICT/FCT spring test probe uses low resistivity materials and optimized structures. It can continuously carry higher currents without heating up, avoiding poor contact or damage to peripheral devices caused by thermal expansion.
Addressing the challenges of testing fixture lifespan and maintenance costs
Engineer’s Challenge:
Frequent maintenance of testing fixtures and replacement of ICT/FCT spring test probes are time killers and cost black holes in the production line. After 10,000 punctures, ordinary spring test probes may experience unstable contact due to spring fatigue and plunger wear. This forces the production line to shut down for maintenance, seriously affecting production capacity and delivery cycles.
Johoty brings you huge benefits:
Ultra-long mechanical lifespan: The core spring of Johoty’s spring test probe is made of SUS631 and undergoes special heat treatment. It can ensure a stable stroke of usually 100,000 or even 500,000 times without attenuating its elasticity. This directly translates into longer maintenance cycles and lower downtime.
High machining accuracy and consistency: The machining tolerance of each Johoty’s spring test probe is controlled within ± 0.01mm. This consistency ensures uniform pressure at every test point on the fixture. Avoiding test failures or PCB pad damage caused by individual spring test probes being lazy or overvoltage.
Rich plunger tip options for complex scenarios: whether sharp pointed tips are used to puncture oxide layers or coronal tips are used for alignment and fault tolerance. Alternatively, the triangular head can be used for high currents, and Johoty offers a full range of plunger tip options that can accurately match various tested points such as test points and through holes.
Solving the challenges of non-standard and high difficulty testing solutions
Engineer’s Challenge:
Standard products cannot solve all problems. Engineers often encounter micro spacing, irregular structures, special materials, or extreme environmental testing. What they need now is not just suppliers, but technical partners who can work together to solve problems. They crave for fast, professional technical response and customized solutions.
Johoty brings you huge benefits:
Powerful collaborative design and customization capabilities: Johoty has a professional 45 person R&D team that can flexibly customize according to specific customer needs. We can quickly provide customized solutions for spring test probe structure, size, elasticity, and materials. Whether it is a 0.2mm spring test probe with ultra-small spacing or a special material with high temperature resistance, they can be developed collaboratively.
Deep technical consultation and problem diagnosis: Johoty’s engineering team can provide technical support beyond Spring Test Probe itself. Assist clients in analyzing the root cause of test failures. Is it a spring test probe issue, fixture issue, or PCB design issue? And provide systematic solutions.
Fast sample and delivery response: Understanding the urgency of research and development, Johoty can provide efficient sample services and stable batch delivery. We can ensure that the project progress of engineers is not hindered.
Solving the challenge of finding the optimal solution between budget and risk
Engineer’s Challenge:
Engineers often need to make the most cost-effective decisions under strict budget control. They need to consider the unit price of spring test probes, as well as the maintenance costs, downtime costs, and quality risk costs associated with long-term use. Meanwhile, the stability and risk resistance of the supply chain are also crucial.
Johoty brings you huge benefits:
Highly competitive total cost of ownership: Although Johoty’s single spring test probe may not be the lowest price in the market. But its long lifespan, high yield, and stability make it much cheaper than cheap spring test probes that require frequent replacement during their lifecycle. This is a smarter cost saving approach.
The supply chain advantages of Chinese intelligent manufacturing: Johoty is rooted in the global manufacturing center and has a mature, efficient, and highly resilient supply chain system. This ensures stable and timely supply during global market fluctuations. We can greatly reduce the risk of supply chain disruptions.
Excellent Quality Benchmarking International Brands: Johoty’s Spring Test Probe directly benchmarks and surpasses many top international brands in terms of quality. But it offers more attractive prices. This provides engineers with a win-win option: they can achieve top-notch performance without having to pay a high brand premium.
Spring Test Probe Applications:
Power rail voltage/ripple test
Challenge: Ripple and transient jumps need to be detected in FCT for power rails of 3.3 V, 5 V, and 12 V. However, the unstable contact, high contact impedance, and signal distortion of the spring test probe lead to measurement errors.
The function of Johoty’s ICT/FCT spring test probe: provide low contact resistance, stable spring pressure, reliable contact, and support high-frequency response. Reduce signal distortion caused by spring test probes.
Customized solution: Johoty can customize according to the size, spacing, travel, and load current requirements of the customer’s power rail testing points. Including barrel diameter, stroke, spring force, pin head type, etc.
Efficiency improvement/cost savings: reduced contact failures, decreased offline maintenance frequency, which can save downtime for maintenance and spring test probe replacement costs. The lifespan of spring test probes can be increased to 500,000 cycles.
Advantages: Compared to conventional spring test probes, it has higher contact resistance, lower lifespan, and more frequent replacement. Johoty’s spring test probe is more reliable in terms of fatigue resistance, low impedance, and signal distortion control.
Whole board electrical connectivity testing
Challenge: In the ICT stage, it is necessary to measure open circuit, short circuit, resistance, capacitance, inductance, diode polarity, etc. High density PCBA testing points, limited space, difficult probe positioning, and easy wear of solder pads.
The function of Johoty’s ICT/FCT spring test probe: provide micro plunger diameter, multi stroke design, and good mechanical positioning. Ensure reliable contact at high-density points and reduce pad damage.
Customized solution: Provide different outer diameters, strokes, and spring force combinations starting from 0.20 mm. Head shapes such as pointed tip, flat head, ball head, blade type, etc., suitable for dense board design.
Efficiency improvement/cost savings: Reduce the number of rework/downtime caused by spring test probe contact failures and improve test yield. The increase in lifespan means that the replacement cycle of spring test probes is extended, thereby reducing consumables expenses.
Advantages: Conventional module spring test probes have positioning deviation and poor durability, while Johoty customized spring test probes support high-density, low profile, and long lifespan, improving reliability.
Relay/switch function testing
Challenge: Relay input/output in home appliance control boards and industrial control boards must detect switch delay <10 ms and contact resistance <100 mΩ. Traditional spring test probes have poor spring force control and unstable contact resistance.
The function of Johoty’s ICT/FCT spring test probe: provide stable spring force, low contact resistance, and high cycle usage. Ensure accurate detection of relay status with each contact.
Customized solution: Spring test probes specifically designed for large stroke relays can be provided. Head shapes such as blades or cups, adapted to different contact structures. And a larger spring stroke can be set to match the action of the switch mechanism.
Efficiency improvement/cost savings: Improved testing accuracy and reduced false/missed detections caused by spring test probe contact failures. Extending the lifespan reduces the frequency of replacing spring test probes, thereby reducing production downtime costs.
Advantage: Conventional spring test probes are prone to spring fatigue and contact deformation due to multiple switch tests. Johoty’s spring test probes have better lifespan, more stable contact, and lower failure rate.
Communication interface electrical/waveform integrity verification
Challenge: Communication ports such as UART, RS-232, RS-485, CAN, I2C need to be tested for transmission/reception functionality and waveform integrity in FCT. The spring test probe introduces inductance/capacitance and improper contact, resulting in signal distortion.
The function of Johoty’s ICT/FCT spring test probe: design a low self introduction and low impedance structure that supports high-frequency signal acquisition. We can ensure the true restoration of the contact signal.
Customized solution: Spring test probes can be customized according to customer communication frequency/protocol requirements. Including head shape and stroke, optimizing structure to reduce parasitic parameters, and providing TDR testing support.
Efficiency improvement/cost savings: Reduce debugging time/repair times caused by signal distortion. High precision spring test probes reduce misjudgments and lower scrap rates.
Advantage: Traditional spring test probes can become a bottleneck in high-speed communication interfaces. Johoty’s spring test probe provides dedicated signal integrity design and customization support, making it more suitable for high-speed/complex communication testing.
Multi-channel LED driver/light control consistency testing
Challenge: In FCT, it is necessary to detect the logic control, brightness consistency, and synchronization of multiple LED driving signals. There are many testing points and complex layouts, and the positioning of spring test probes is cumbersome with large signal errors.
The function of Johoty’s ICT/FCT spring test probe: support multi pin array design, different head type contact pins, stable contact, and low resistance. We ensure consistency in multi-channel parallel testing.
Customized solution: Provide customized spring test probe arrangements, special head shapes, cup/blade shapes. And spring test probe specifications can be customized according to LED driving current/voltage requirements to adapt to specific lighting structures.
Efficiency improvement/cost savings: Parallel testing with multiple spring test probes reduces testing cycles. High precision spring test probes reduce rework caused by channel inconsistencies.
Advantages: Traditional single pogo pin point by point testing is slow and has high positioning errors. Johoty supports array, customization, more precise positioning, and higher efficiency.
Key matrix/input signal scanning verification
Challenge: Key matrix testing in POS terminals and industrial control panels requires fast scanning of open/short circuit arrangements. Spring test probes are prone to contact failure or virtual connections at the intersection of rows and columns.
The function of Johoty’s ICT/FCT spring test probe: adapt to thin film contacts with low stroke and high precision. Ensure reliable signal capture and reduce missed measurements.
Customized solution: Customizable fine diameter contact pins and low spring force. This can protect the membrane switch and head shape such as inclined or spherical to adapt to special contacts.
Efficiency improvement/cost savings: reduce test failure rate, improve scanning speed, and reduce manual intervention.
Advantages: The existing spring test probe often has excessive spring force, causes significant damage to thin film contacts, and has a short lifespan. Johoty spring test probe has controllable spring force, longer lifespan, and stronger adaptability.
Sensor interface/reserved port detection
Challenge: Interfaces such as temperature and humidity, air pressure, and Hall sensors need to be tested for connectivity and response. The number of testing interfaces is large and diverse, and spring test probes must adapt to different port shapes.
The function of Johoty’s ICT/FCT spring test probe: provide multiple tail installation methods: press in, threaded, and pin in. Adapt to different sockets to ensure reliable contact.
Customized solution: Customize spring test probes according to the socket form, pin spacing, and density of the interface structure. Including its tail form, stroke, spring force, and head shape, for quick replacement or modular maintenance.
Efficiency improvement/cost savings: Modular replacement of spring test probes reduces maintenance time and interface adaptation costs. Reliable contact reduces retesting caused by poor contact.
Advantages: Generally, the tail form of spring test probe is fixed, and when the interface changes, the fixture needs to be adjusted or replaced. Johoty offers customizable tail, easy replacement, and high adaptability.
Drive motor/electromagnetic lock output detection
Challenge: PWM, direction control, Hall feedback, and electromagnetic drive output in fans, pump control boards, and new energy storage devices must be carefully tested. Need to be exposed to high current and high-frequency switching signals.
The function of Johoty’s ICT/FCT spring test probe: customize high rated current, low contact impedance, self spring structure anti fatigue, and adapt to repeated switching tests.
Customized solutions: can be customized according to customer current levels (such as 5 A/10 A), high-frequency switching, and blade/cup shapes. To adapt to high-power output terminals.
Efficiency improvement/cost savings: High current adaptation reduces downtime caused by spring test probe overheating/damage. Improve testing reliability, spring test probe lifespan, and reduce consumable costs.
Advantages: Spring test probes generally have low current carrying capacity, fast thermal rise, and short lifespan. Johoty’s spring test probe is suitable for high-power scenarios, with more stable contact and longer lifespan.
Spring Test Probe Advantages:
Ultra-low and stable contact resistance (<20mΩ)
Challenge: Misjudgment. Traditional spring test probes have fluctuating or high resistance. This leads to inconsistent test results for high impedance, low-power components. Causing false defects or missed detections, seriously interfering with fault analysis and reducing production line throughput.
Johoty’s solution and advantages: using patented coating technology and high elasticity beryllium copper or SUS631 springs. Each contact resistance remains stable at an extremely low level. This provides you with unparalleled test signal fidelity, eliminating testing errors caused by the performance of the spring test probe itself.
Excellent lifespan consistency (>100,000 cycles)
Challenge: Unplanned downtime and maintenance. The production line is frequently interrupted due to premature failure of individual spring test probes, and needs to be searched and replaced. Seriously reducing OEE and driving up maintenance costs.
Johoty’s solution and advantages: precise spring mechanics design and ultra-wear-resistant plunger tip processing technology. Ensured consistent performance of the entire batch of spring test probes after 200,000 tests. This directly translates into predictable maintenance cycles and maximizing the continuous operation time of the production line.
Micron level positioning accuracy and extremely small plunger tip marks
Challenge: Physical damage to precision solder pads and miniaturized components. As the PCB wiring density increases, the test points become increasingly small, and rough spring test probes can puncture the solder pads or leave excessive pressure marks. This could potentially damage the long-term reliability of your product.
Johoty’s solution and advantages: Control roundness and straightness, optimize the geometric shape of the plunger tip, and achieve precise and gentle contact. This can protect your expensive prototype boards and products, and is also a necessary prerequisite for handling ultra-small package testing.
Excellent stability under extreme testing conditions
Challenge: Performance degradation in high-temperature/high-frequency testing environments. When conducting high-frequency digital/RF testing in a high-temperature chamber, the electrical performance of ordinary spring test probes will deteriorate sharply. This will result in gaps in the testing coverage.
Johoty’s solution and advantages: The entire series of spring test probes use high-temperature materials and special heat treatment. We ensure no drift in performance within the range of -55°C to+155°C. The optimized RF characteristics minimize signal loss and crosstalk, providing you with a wide range of temperature and frequency testing margins.
FAQ
This requires Johoty’s ultra-fine diameter and high-precision alignment probe. We can provide a series of probes with diameters ranging from 0.20mm to 0.35mm. Using springs and barrels with micrometer-level precision, no bending or misalignment occurs at extremely small distances.
The anti-slip spring test probe has a pointed four-star plunger tip that can puncture the oxide layer and accurately locate it. It can minimize short circuits effectively caused by the sliding plunger.
High frequency: Adopting a gold-plated internal structure and low loss dielectric material to ensure impedance matching and minimal signal attenuation.
High current: Provide high current spring test probes with thick gold or palladium cobalt alloy plating, 10mΩ resistance. It can safely pass a continuous current of up to 50A and control the temperature rise within 30℃.
Low and high temperature: The spring is made of SUS631 or imported piano steel wire. Maintain elastic stability within the range of -55℃ to +155℃, with a lifespan of over 1 million cycles.
Johoty has the ability to customize spring test probes with irregular structures and multi-angle contacts. We provide lateral contact ball tip, Non standard solutions such as spring top pins and long spring test probes for flip type Clamshell fixtures. A large stroke, oblique contact probe used for battery connectors that can avoid obstacles at specific angles. Apply uniform pressure to the surface or shrapnel, and Johoty’s ICT/FCT Spring Test Probe ensures stable contact resistance.
