399-91-039-21-300000

Headers, Receptacles, Female Sockets Overview

The Mill-Max 399-91-039-21-300000 is a spring-loaded test probe designed for high-reliability electrical connections. It features a sleeve and plunger contact type with gold-plated brass alloy contacts. The component supports through-hole mounting and solder cup termination. It operates within a temperature range of -55°C to 125°C and has a rated current capacity of 6.4A. The plunger diameter is 0.019 inches (0.48mm), with an initial operating force of 5gf and a mid-pressure force of 60gf. It offers a mechanical life of 1,000,000 cycles.

Headers, Receptacles, Female Sockets Feature Summary

• Provides reliable electrical connection in rigorous environments using spring-loaded pogo pin technology
• Features gold-plated brass alloy contacts for corrosion resistance and conductivity
• Designed for through-hole installation with solder cup termination

Headers, Receptacles, Female Sockets Applications

• In-circuit testing (ICT)
• Burn-in boards
• Production test fixtures

Headers, Receptacles, Female Sockets Procurement Notes

Verify the specific plunger tip configuration and contact finish thickness against project requirements. Confirm that the through-hole footprint matches the target PCB layout. Ensure the operating force specifications align with the mating device's mechanical constraints. Check RoHS compliance status if required by the end product regulations.

Headers, Receptacles, Female Sockets Selection Notes

Select this component when high-cycle durability and consistent contact resistance are critical. The 6.4A rating suits moderate current applications. Consider the 0.019-inch plunger size for precise alignment needs. Evaluate the -55°C to 125°C range against environmental conditions. Compare against other 399 series variants for different pitch or row configurations.

Headers, Receptacles, Female Sockets Part Context

This part belongs to the Mill-Max 399 series of individual spring-loaded contacts and test probes. These components are engineered for precision-machined interconnect applications requiring high reliability. The series is recognized for manufacturing consistency and performance in demanding electronic testing scenarios.

Headers, Receptacles, Female Sockets Replacement Considerations

Consult official Mill-Max catalogs for direct substitutes within the 399 series. Verify identical plunger dimensions, operating forces, and termination styles before substitution. Generic equivalents may not match the specified mechanical life or contact material properties.