P75-LM2 with Hexagonal Head Pogo Pin

P75-LM2 with Hexagonal Head Pogo Pin is a specialized spring-loaded test probe designed to provide high-reliability contact for printed circuit board (PCB) testing and electrical verification. This specific LM2 variant features a unique hexagonal (6-point) star head profile, which effectively penetrates through oxidation and contaminants on solder joints or test pads. Consequently, it ensures a low-resistance connection even in demanding industrial environments. Precision engineering allows the internal spring mechanism to maintain consistent pressure throughout thousands of cycles. Furthermore, the gold-plated finish enhances conductivity while preventing long-term corrosion. Therefore, the P75-LM2 stands as an essential component for engineers building custom test fixtures or automated testing equipment (ATE).

Key Features:

• Hexagonal Star Head: The 6-point head design provides multiple contact points, allowing it to “bite” into solder and pads for superior electrical stability.
• High-Durability Spring: An internal high-carbon steel spring facilitates over 100,000 compression cycles without significant fatigue.
• Gold Plating: Both the plunger and the barrel feature a high-quality gold plating to minimize contact resistance and maximize corrosion resistance.
• Universal Compatibility: This probe fits standard R75 series receptacles, which allows for easy replacement without de-soldering the entire fixture.
• Stable Current Flow: The precision-machined barrel ensures a steady current path, making it suitable for both signal and low-power testing.

Technical Specifications:

• Full Travel: ≈ 2.50 mm
• Spring Pressure: ≈ 100g to 120g (at recommended travel)
• Current Rating: 3.0 A maximum
• Contact Resistance: ≤ 50 mΩ
• Rated Life: ≥ 100,000 cycles
• Operating Temperature: −40°C to +125°C

Mechanical Specifications:

• Plunger Material: High-carbon steel (Gold plated over nickel)
• Barrel Material: Phosphor bronze (Gold plated over nickel)
• Spring Material: Stainless steel or high-carbon music wire
• Head Type: LM2 (Hexagonal / 6-Point Star)

Dimensions:

• Total Length: ≈ 16.5 mm
• Barrel Diameter: 1.02 mm
• Head Diameter: 1.30 mm
• Recommended Mounting Hole: 1.35 mm to 1.40 mm (when used with R75 series receptacles)
• Minimum Center Distance: 1.91 mm (75 mil)

Pinout and Wiring:

• Signal Contact: The hexagonal head serves as the active contact point that interfaces directly with the Target PCB.
• Fixture Wiring: You typically insert the P75-LM2 into an R75 series receptacle. However, you must solder the signal wire directly to the tail end of the receptacle, not the pogo pin itself, to allow for quick pin replacement.
• Installation: Ensure the pin remains vertical within the fixture to prevent lateral stress on the internal spring mechanism.

Datasheet Reference:

• Download P75 Series Technical Reference Datasheet

Commonly Used in:

• ICT Fixtures: Used extensively in In-Circuit Test (ICT) beds of nails for high-volume PCB manufacturing.
• Programming Headers: Providing a temporary, solderless connection for flashing firmware onto microcontrollers.
• Custom Test Jigs: Essential for DIY electronics testing where frequent board revisions require flexible contact solutions.

Applications:

• Solder Joint Testing: The star head penetrates Flux residue and oxidation on finished solder joints.
• Through-Hole Component Testing: Ideally suited for contacting the legs of through-hole components from the bottom of the PCB.
• Burn-in Testing: Maintains reliable contact during thermal stress testing of semiconductor devices.

Equivalent Models:

• GKS-075 Series: The industry-standard equivalent from European manufacturers, offering identical dimensions and mounting specs.
• P75-E2: A similar model featuring a conical head style; however, it lacks the multi-point penetration of the LM2 star head.
• R75-2W: This is the compatible wire-wrap receptacle used to house the P75-LM2 pin.

Package Includes:

• 1 x P75-LM2 Hexagonal Head Pogo Pin (Spring Test Probe)