MIL-DTL-38999 III (D38999) harsh environment connectors consist of wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs. They are offered in 9 shell sizes and 54 insert arrangements, utilizing M39029 contacts in sizes 22D, 20, 16, 12, 10 power, and 8 twinax. 38999 Series 3 connectors are offered in a variety of shell materials, including aluminum, stainless steel, and lightweight composite. They are also available in a wide assortment of plating options, including olive drab cadmium, nickel, black zinc nickel, and passivated stainless steel. Selection includes RoHS-compliant, cadmium-free finishes, as well as Boeing BACC-approved designs.
Part Aliases: TE Connectivity | Deutsch YACT24MH21HNV00100
The D38999/24MH21HN is a high-performance MIL-DTL-38999 III (D38999) connector, featuring a jam nut receptacle design for secure and reliable connections in harsh environments. With 21 gold-plated contacts, this connector offers a maximum operating temperature of 200 °C and a voltage rating of 1250 V DC. Its composite shell construction, with electroless nickel plating, provides excellent durability and ingress protection, making it ideal for military and aerospace applications. The pin contact configuration, with a mating style of triple start threaded, ensures a stable and low-resistance connection, with a mating life of 1500 cycles. Overall, the D38999/24MH21HN is a rugged and reliable connector solution for high-reliability systems.