Probe Pin: Current Rating 0.5-5A typical

Q: What is the difference between a probe pin and a pogo pin?

Probe pin is the industrial term for precision test contacts used in automated test equipment, while pogo pin is a colloquial term often used for similar spring-loaded connectors in consumer electronics. Probe pins typically have stricter specifications for contact resistance, lifecycle, and precision alignment.

Q: How do I select the right probe pin for my application?

Consider test point geometry (pad size, pitch), current requirements, frequency of signals, required contact force, operating environment, and lifecycle needs. Crown tips work well for flat pads, spear tips for vias, and multi-finger tips for uneven surfaces.

Q: What causes probe pin failure in test fixtures?

Common failure modes include spring fatigue from over-compression, plating wear from excessive cycles, contamination buildup on tips, corrosion in humid environments, and misalignment causing bent plungers.

Component Specifications

Definition

A probe pin is a spring-loaded, precision-engineered electrical contact component designed for automated test equipment (ATE) and manual test fixtures. It creates temporary electrical connections between test points on devices under test (DUTs) like PCBs, semiconductor packages, or connectors and the test system's measurement instruments. These components ensure reliable signal transmission during electrical testing while minimizing contact resistance and preventing damage to delicate test points through controlled spring force and specialized tip geometries.

Working Principle

The probe pin operates on a spring-loaded plunger mechanism housed within a barrel. When pressed against a test point, the plunger compresses an internal spring, maintaining consistent contact force. This establishes a low-resistance electrical path from the test point through the plunger tip, spring, and barrel to the test fixture's wiring. The spring mechanism accommodates variations in test point height and provides wiping action to break through surface oxides, ensuring reliable electrical contact.

Materials

Plunger and barrel: Beryllium copper (BeCu) or phosphor bronze with gold plating (typically 30-50 microinches hard gold over nickel underplate) for optimal conductivity and corrosion resistance. Spring: Music wire or stainless steel. Insulators: PEEK, Vespel, or ceramic for high-temperature applications. Alternative materials include palladium-nickel or selective gold plating for cost optimization.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Lifecycle	100,000-1,000,000 cycles depending on design
Tip Styles	Crown, spear, serrated, concave, multi-finger
Spring Force	10-300g typical range
Current Rating	0.5-5A typical
Travel Distance	0.25-6.35mm (0.010-0.250 inches)
Plunger Diameter	0.25mm-2.0mm (0.010-0.080 inches)
Contact Resistance	<50mΩ initial, <100mΩ after lifecycle
Operating Temperature	-55°C to +125°C standard, up to +200°C for high-temp variants

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, IEC 60512, MIL-STD-202, EIA-364

Parent Products

This component is used in the following industrial products

Electrical Test Fixture/Probes

A precision interface component used to establish electrical contact with microfluidic chips or cell sorting cartridges for signal transmission and testing.

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Engineering Analysis

Risks & Mitigation

Contact resistance drift over time
Tip contamination affecting measurements
Spring fatigue reducing contact force
Plating wear exposing base material
Misalignment damaging test points
Electrostatic discharge (ESD) sensitivity

FMEA Triads

Trigger: Insufficient spring force or worn spring
Failure: Intermittent contact or high resistance
Mitigation: Regular calibration of test fixtures, preventive replacement based on cycle count, use of probes with higher spring force margins

Trigger: Contamination on tip surface
Failure: Increased contact resistance and measurement errors
Mitigation: Regular cleaning with appropriate solvents, use of probes with wiping action, controlled cleanroom environment

Trigger: Misalignment in test fixture
Failure: Bent plunger or damaged test point
Mitigation: Precision fixture design with guide plates, optical alignment verification, use of probes with self-aligning features

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Plunger diameter: ±0.005mm, Barrel length: ±0.02mm, Spring force: ±10% of nominal value

Test Method

Contact resistance measured per EIA-364-23, lifecycle testing per EIA-364-09, current rating verification per EIA-364-70, insertion/extraction force per EIA-364-13

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Probe Pin

Manufacturer profiles associated with Probe Pin.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between a probe pin and a pogo pin?