RH7126XL-0.64-21/1318774-1 12 V, 12 Position, Automotive Housing for Female Terminals

1. Overview and Primary Application

The RH7126XL-0.64-21/1318774-1 is a 12-position automotive-grade connector housing designed specifically for female terminals. As a housing for female terminals, it serves as the non-sealed, protective casing that holds receptacle contacts, enabling secure electrical connections in wire-to-board, wire-to-device, and wire-to-wire systems. The component is rated for a nominal voltage architecture of 12 V (operating voltage 12 VDC), making it suitable for standard automotive electrical systems. With a non-sealable design, this housing is intended for applications where environmental sealing is not required, such as interior or protected engine bay locations.

2. Mechanical and Housing Construction

The housing features a rectangular shape, which is a common form factor for multi-position automotive connectors. It is molded from Polybutylene Terephthalate (PBT), a thermoplastic polyester known for its high mechanical strength, dimensional stability, and resistance to heat and chemicals. The natural (uncolored)primary product color indicates no added pigment, which is typical for standard-grade PBT materials.

Key mechanical attributes include:

Primary locking feature: Locking lance. This integral locking mechanism on the housing engages with the female terminal to retain it securely inside the cavity.

Mating alignment: With polarization. The housing includes polarization features to ensure correct mating orientation with the corresponding header or device connector, preventing misinsertion.

Cable exit angle: 180° (straight or inline). This allows cables to enter and exit along the same axis, simplifying harness routing in linear assemblies.

Strain relief: Without. No integrated strain relief is provided; therefore, external cable management or support may be needed in high-vibration environments.

Connector mounting type: Cable mount (free-hanging). The connector is designed to be attached to wires and cables, not panel- or PCB-mounted directly.

3. Contact and Electrical Specifications

The housing accommodates receptacle-type contacts with a contact size of 0.64 mm and a mating tab width of 0.64 mm (0.025 in). This .64mm terminal system is a widely adopted industry standard for low-to-medium current automotive signal and power circuits. The connector is not a mixed or hybrid type, meaning all 12 positions accept the same contact size and type.

Electrical parameters are strictly defined:

Nominal Voltage Architecture: 12 V

Operating Voltage: 12 VDC
These ratings confirm the housing is intended for 12V DC electrical systems common in passenger cars, light trucks, and other 12V-based vehicles.

4. Configuration and Dimensional Data

The housing provides 12 positions arranged in 2 rows. Key dimensional specifications are:

Centerline (pitch): 2.2 mm (0.087 in). This tight pitch allows for compact connector design while maintaining adequate creepage and clearance distances for 12V applications.

Row-to-row spacing: 3 mm (0.118 in)

Product length: 15.4 mm (0.61 in)

Product width: 21 mm (0.83 in)

Connector height: 15.8 mm (0.62 in)

The 2-row configuration with a 2.2 mm pitch and 3 mm row spacing results in a compact, rectangular footprint, facilitating use in space-constrained automotive modules such as body control units, lighting assemblies, or interior wiring junctions.

5. Environmental and Thermal Performance

The operating temperature range is -30 to 105 °C (-22 to 221 °F), with a maximum rated temperature of 105 °C. This range covers typical automotive interior and underhood (non-engine-mounted) environments. The housing is explicitly non-sealable (Sealable: No), meaning it does not include provisions for silicone seals or gaskets. Therefore, it must not be used in locations exposed to direct water spray, high-pressure washing, or submersion.

6. Connector System and Locking Features

The connector system supports three mating configurations:

Wire-to-Board (with a compatible PCB header)

Wire-to-Device (with a device-integrated header)

Wire-to-Wire (with a matching plug housing)

The primary locking feature is the Locking Lance, molded into the housing cavity. When a female terminal is inserted, the lance deflects and then snaps behind a shoulder on the terminal, providing retention. There is no Terminal Position Assurance (TPA) device, meaning the locking lance is the sole means of terminal retention. This simplifies assembly but requires careful insertion to ensure proper lance engagement.

No strain relief is provided. In applications with significant cable movement or vibration, external strain relief (such as cable ties or adhesive-lined heat shrink) may be required to prevent forces from being transmitted to the terminal crimp and the locking lance.