776533-3 12 Pin Female Assembly Wiring Harness Automotive Connector Car Electrical Wire Socket

The TE Connectivity 776533-3 is a 12-position, 2-row, sealable plug assembly from the AMPSEAL 16 Connector System. This connector is designed for wire-to-wire applications and is mechanically mated with a lance-less contact system. The housing is molded in black glass-filled thermoplastic. It accepts heavy-duty stamped and formed (HDSF) size 16 receptacle (socket) contacts. The connector offers a nominal voltage architecture of 12 V, 24 V, 48 V and 240 V, with a broad operating temperature range from -40 °C to +125 °C. The centreline spacing between circuits is 4.5 mm [0.177 in]. The connector is fully sealable, providing moisture resistance through wire seals and a peripheral seal at the interface area. It is rated IP67, making it suitable for harsh automotive and industrial environments where exposure to water, dust and other contaminants is expected. The AMPSEAL 16 family includes plug assemblies, cap assemblies, and HDSF size 16 contacts. The housing assemblies are available in 2 through 12 circuit versions. The 776533-3 is the 12-way plug assembly, which mates with a corresponding cap assembly (loaded with pin contacts) or a printed circuit board mounted header. The connector system is intended for wire-to-wire and wire-to-device applications.

Product Features

The plug assembly incorporates a sealed connector system with wire seals (available in standard diameter and reduced diameter options) and a peripheral seal that compresses during mating, providing IP67 rated environmental sealing. The lance-less contact system retains contacts without traditional lances, reducing the risk of damage during assembly and improving contact retention reliability. The Terminal Position Assurance (TPA) feature locks the contacts in the housing after insertion; the TPA must be in the pre-staged (unlocked) position before inserting contacts, then moved to the fully locked position to secure the contacts, which prevents accidental contact back-out. An integral Connector Position Assurance (CPA) is designed on the plug assembly. It acts as a secondary locking mechanism that prevents the connector latch from being inadvertently depressed, ensuring the connector remains mated under vibration and shock. The CPA is shipped in a staged position and must be pushed into the fully engaged position after mating. The connector is available with different keying configurations (colour coded and mechanical); the 776533-3 is identified as Code C, which prevents mismating with cap assemblies having different keying codes. For any cavities not loaded with contacts, a sealing plug (part number 776363-1 for both standard and reduced diameter wire seals) can be inserted to maintain the environmental seal.

Materials and Construction

The plug housing is made from glass-filled thermoplastic, providing high mechanical strength and dimensional stability over the entire temperature range. The wire seals and peripheral seal are moulded from silicone rubber, offering excellent flexibility, compression set resistance and chemical compatibility. The HDSF size 16 socket contacts are made from a copper alloy and are available with gold or nickel plating. Although the HDSF size 16 contacts accept a wire range of 14-20 AWG with insulation diameters from 1.27 mm to 3.94 mm, the product is recommended to be used with wires having insulation diameters that match the selected wire seal (standard diameter wire seal for insulation Ø 2.18-3.67 mm, typically 14-18 AWG; reduced diameter wire seal for insulation Ø 1.30-2.54 mm, typically 18-20 AWG). The black colour of the housing indicates the specific keying code (Code C).

Sealing and Environmental Protection

The AMPSEAL 16 connector system achieves moisture resistance by two methods: wire seals that individually seal each wire entry, and a peripheral seal that seals the mating interface between the plug and cap assemblies. For the 776533-3 plug, the wire seals are integrated into the rear of the housing. When a contact with a crimped wire is inserted, the wire insulation passes through the wire seal, creating a tight barrier against fluids and dust. Unused cavities are closed with dedicated sealing plugs. The combination of these features enables the connector to meet IP67 requirements, meaning it is dust-tight and can withstand temporary immersion in water.

Terminal Position Assurance (TPA) and Connector Position Assurance (CPA)

The TPA is a rigid plastic component that slides into the plug housing after all contacts are inserted. In the pre-staged (unlocked) position, there is clearance between the seal cover and the TPA. Contacts are inserted straight into the cavities, forcing them through the wire seal until an audible and tactile click indicates that the contact retention finger has engaged behind the contact retention shoulder. After all contacts are inserted, the TPA is pushed into the fully locked position. For the plug housing, the TPA is locked by holding the rear of the housing and pushing the TPA toward the rear until it latches. This action forces the TPA fingers behind the contacts, providing a secondary lock that increases contact retention force. The CPA is initially in a staged position as shipped (see Figure 2 of the application specification). After the plug and cap are mated and the primary latch is fully engaged (an audible click is heard), the CPA is pushed forward until it slides under the primary latch pad. In this fully engaged position, the CPA prevents the latch from being depressed, thus avoiding accidental unmating. To unmate, the CPA must first be slid rearward to reveal the latch tip, then the latch pad is depressed while pulling the housings apart.

Contact System and Wire Size

The 776533-3 accepts HDSF size 16 socket contacts. These contacts are designed for wire sizes from 14 AWG to 20 AWG. The specific contact part numbers are not listed in the provided material, but they are covered under Application Specification 114-13045. For proper sealing, the wire insulation diameter must be compatible with the chosen wire seal option (SDWS or RDWS). The contacts are crimped (refer to Application Specification 114-13045 for termination procedures). After crimping, each contact is manually loaded into the plug housing cavity. A retention verification is performed by pulling each wire with a force of 4.5 to 8.9 N [1 to 2 lbf] to confirm that the contact is locked in place.

Assembly Procedure Overview

The assembly procedure for the 776533-3 follows the general AMPSEAL 16 instructions. First, verify that the TPA is in the pre-staged (unlocked) position. Then align the crimped socket contact with the desired cavity and push straight in until a click is felt. After all contacts are inserted, push the TPA into the fully locked position. Tug each wire to confirm retention. Insert sealing plugs into any unused cavities. Finally, mate the plug assembly with the corresponding cap assembly or PCB header until the primary latch clicks, then push the CPA into the locked position (under the latch pad). Unmating requires sliding the CPA back, depressing the latch, and pulling apart. For contact removal or TPA removal, a special Contact/TPA Removal Tool (P/N 776441-1) is required, as described in the application specification.

Performance Expectations

The AMPSEAL 16 connector system is designed to meet rigorous automotive performance requirements. Although specific numerical limits are not detailed in the provided specification, the system is qualified for mechanical mating durability, contact retention, vibration resistance, thermal shock, and fluid resistance. The IP67 rating confirms protection against water ingress. The operating temperature range of -40 °C to 125 °C supports under-hood and exposed applications. The glass-filled PBT housing provides UL 94HB flammability rating.

Regulatory Compliance

Based on the information provided, the product is compliant with EU RoHS (2011/65/EU) including Delegated Directive 2015/863/EU, and compliant with EU ELV Directive 2000/53/EC. China RoHS 2 shows no restricted substance(s) above threshold. Regarding EU REACH (EC) No. 1907/2006, the product does not contain REACH SVHC (ECHA Candidate List February 2026, 253 substances). The halogen content is BFR/CFR/PVC-free; however other sources may have Br or Cl > 900 ppm. The solder process capability is not suitable for soldering processes.

Conclusion

The TE Connectivity 776533-3 is a robust, sealable 12-position plug assembly from the AMPSEAL 16 family. It features a lance-less contact system, TPA, CPA, IP67 sealing, and a wide operating temperature range. The connector is suitable for wire-to-wire and wire-to-device automotive and industrial applications requiring reliable environmental protection and secure contact retention. The product is fully compliant with major environmental regulations and is packaged in tubes of 14 pieces.