Test Probe Array

Product Specifications

Technical details and manufacturing context for Test Probe Array

Definition

The Test Probe Array is a critical component of an Electrical Test Station, consisting of multiple precisely positioned electrical probes arranged in a specific pattern to interface with test points on printed circuit boards (PCBs), integrated circuits (ICs), or other electronic assemblies. It enables efficient, high-throughput electrical testing by providing simultaneous contact for signal transmission, power delivery, and measurement during functional testing, continuity checks, or parametric analysis. The array is customizable in terms of the number of probes (16–256), probe pitch (0.5–2.54 mm), array size (50×50–300×300 mm), and probe length (10–50 mm), allowing adaptation to various DUT layouts. Key electrical specifications include contact resistance ≤50 mΩ (measured at 10 mA), current rating 1–5 A per probe, insulation resistance ≥1000 MΩ (at 100 V DC), and dielectric withstanding voltage of 500 V AC for 1 minute. Mechanical parameters include spring force 0.5–2.0 N at 2/3 compression, operating temperature range -40–85°C, and weight 0.5–5 kg depending on size and probe count. Materials used for probes include beryllium copper, phosphor bronze, tungsten carbide, and PEEK (Polyether Ether Ketone) for insulation or structural parts. Probe material options are beryllium copper or hardened steel. These values are reference ranges; actual specifications must be confirmed with the manufacturer for the specific model and application. The array is designed for use in automated test equipment, and its performance depends on proper alignment, compression, and maintenance. Regular inspection for probe wear, contamination, and spring fatigue is recommended to ensure consistent contact and measurement accuracy.

Working Principle

The array aligns with predefined test points on the device under test (DUT). When engaged, each probe makes electrical contact, allowing test signals to be sent from the test station's instrumentation through the probes to the DUT, and responses to be measured back through the same probes. This parallel testing capability significantly reduces test time compared to sequential probing. The probes are spring-loaded to accommodate variations in DUT surface height and to ensure consistent contact force. The array is typically mounted on a fixture that provides mechanical alignment and compression. Proper engagement requires that the DUT be positioned accurately relative to the probe tips, and that the compression distance be within the specified spring travel range. The electrical performance is influenced by contact resistance, which should be minimized to avoid signal degradation. The array must be maintained to prevent probe tip contamination or damage, which can lead to open or high-resistance contacts.

Common Materials

Beryllium Copper, Phosphor Bronze, Tungsten Carbide, PEEK (Polyether Ether Ketone)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Number of Probes	16–256 pcs	Customizable based on test points
Probe Pitch	0.5–2.54 mm	Standard pitches; custom available
Contact Resistance	≤50 mΩ	Measured at 10 mA
Current Rating	1–5 A	Per probe; depends on probe type
Operating Temperature	-40–85 °C	Extended range available
Probe Length	10–50 mm	Custom lengths on request
Spring Force	0.5–2.0 N	At 2/3 compression
Probe Material	BeCu, Steel	Beryllium copper or hardened steel
Insulation Resistance	≥1000 MΩ	At 100 V DC
Dielectric Withstanding Voltage	500 V AC	For 1 minute
Array Size (L×W)	50×50–300×300 mm	Custom sizes available
Weight	0.5–5 kg	Depends on size and probe count

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

Components / BOM

Probe Tip Part
Makes direct electrical contact with test points on the device under test

Material: Tungsten Carbide or Beryllium Copper
Probe Body Part
Houses the spring mechanism and provides structural support

Material: Phosphor Bronze or Stainless Steel
Spring Mechanism Part
Provides controlled contact force and allows for vertical compliance

Material: Spring Steel
Mounting Plate Part
Holds all probes in precise alignment and positions the array relative to the test fixture

Material: Aluminum or PEEK

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Electrical Test Station

View system integration details

Manufacturers of Test Probe Array

Manufacturer profiles associated with Test Probe Array.

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Frequently Asked Questions

What is the typical number of probes in a Test Probe Array?

The number of probes is customizable and typically ranges from 16 to 256, depending on the test points required. The exact count should be specified based on the DUT layout and confirmed with the manufacturer.

What materials are used for the probes?

Probe materials include beryllium copper, phosphor bronze, tungsten carbide, and PEEK (Polyether Ether Ketone) for insulation or structural parts. The probe material options are beryllium copper or hardened steel. Material selection affects conductivity, wear resistance, and operating temperature range.

What is the contact resistance specification?

The contact resistance is ≤50 mΩ, measured at 10 mA. This value is a reference; actual performance may vary with probe type, material, and condition. It is important to verify the specification for the specific model and application.

How should the array be maintained?

Regular inspection for probe wear, contamination, and spring fatigue is recommended. Clean probe tips as needed, and replace worn or damaged probes. Ensure that the compression distance is within the specified range to maintain consistent contact force and electrical performance.

Data Basis

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Preliminary Technical Classification

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pressure:	Max 5 N per probe
other spec:	Contact resistance: <50 mΩ, Insulation resistance: >100 MΩ
temperature:	-40°C to +125°C

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