INDUSTRY COMPONENT

Probe Pin

A precision electrical contact component used in test fixtures to establish temporary connections for electrical testing of printed circuit boards and electronic assemblies.

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

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Probe Pin.

test probe pin pogo pin spring probe electrical test contact PCB test fixture ATE component semiconductor test spring-loaded connector Probe Pin Probe Pin in Computer, Electronic and Optical Product Manufacturing

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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.7 / 5.0 (33 reviews)

"The technical documentation for this Probe Pin is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Probe Pin so far."

"Testing the Probe Pin now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

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.

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.

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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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