RH7121CXL-1-10/174973-2 12 Pin 2 Row Vertical Multilock Connector

1. Overview and Primary Application

The RH7121CXL-1-10/174973-2 is a 12-position, 2-row vertical Multilock connector assembly designed for wire-to-board applications. Unlike a simple header or housing alone, this product is a complete connector assembly that terminates to a printed circuit board. It features a fully shrouded header design, which provides protection to the mating tabs and guides the mating female housing during connection. Rated for a nominal voltage architecture of 12 V (maximum voltage rating 12 VDC), this connector is intended for automotive or other 12V DC electrical systems. The non-sealable design makes it suitable for interior or protected environments where direct water exposure is not expected. Each contact carries a maximum current rating of 1 A, making this connector ideal for low-current signal circuits.

2. Mechanical and Housing Construction

The connector has a rectangular shape and is molded in black primary product color. As a fully shrouded header, the mating area is surrounded by a plastic wall, which reduces the risk of bent pins during handling and mating. The connector is not a mixed or hybrid type, meaning all 12 positions accept the same tab size and type.

Key mechanical attributes include:

Connector product type: Connector Assembly – this includes the housing and pre-loaded male tabs (contacts).

Header type: Fully Shrouded – offers protection and correct mating guidance.

Mating alignment: With – polarization features ensure correct orientation with the mating female housing.

Mating retention type: Locking Interface – the header includes features (such as a latch or locking ramp) that engage with the mating housing to prevent accidental unmating.

PCB mount retention: With – the connector is secured to the PCB using mounting holes (PCB mount retention type: Mounting Hole).

Panel mount feature: Without – this connector is not designed for mounting through a panel; it is board-mounted only.

PCB mount alignment: Without – no additional alignment posts are provided (alignment is achieved through the mounting holes and the mating interface).

3. Contact and Electrical Specifications

The connector features tab-type contacts (male pins) that are pre-loaded into the housing. Contact specifications are as follows:

Contact type: Tab (male pin)

Mating tab thickness: 0.64 mm (0.025 in)

Mating tab width: 1 mm (0.04 in)

Contact current rating (max): 1 A per contact

Contact mating area plating material: Tin (Sn)

The contact geometry (0.64 mm thickness × 1.00 mm width) is a common terminal size for low-current signal applications in automotive electronics. The tin plating provides adequate corrosion resistance and solderability for environments that are not exposed to extreme temperatures or aggressive chemicals. Each contact is rated for 1 A maximum, so this connector is intended exclusively for signal circuits, not for power distribution. The connector contains a single section (Number of Sections: 1) with 12 signal positions.

Electrical parameters are strictly defined:

Nominal Voltage Architecture: 12 V

Operating Voltage: 12 VDC

Maximum Voltage Rating: 12 VDC

These ratings confirm the connector is intended for 12V DC electrical systems. It should not be used above 12V or for AC applications without additional verification.

4. Configuration and Dimensional Data

The connector offers 12 positions arranged in 2 rows. Key housing dimensional specifications:

Centerline (pitch): 2.5 mm (0.098 in)

Number of rows: 2

Number of signal positions: 12

The 2.5 mm pitch is slightly larger than the 2.2 mm pitch seen in some compact connectors, providing more robust creepage and clearance distances while still allowing a reasonably compact footprint. This pitch is common in Multilock connector families.

Overall connector dimensions:

Connector length: 27.5 mm

Connector width: 16.9 mm

Profile height from PCB: 19.2 mm

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 applications (cabin, dashboard, door modules) and some protected underhood locations not subject to extreme engine heat. The connector is non-sealable (Sealable: No), meaning it does not include seals or gaskets. Therefore, it must not be used in locations exposed to direct water spray, high-pressure washing, condensation, or submersion.

The header is fully shrouded, which provides some protection against dust and accidental contact, but does not provide fluid sealing. For dry or dust-only environments, this connector is highly reliable.

Electrical characteristics specific to application:

Circuit Application: Signal – confirmed by the 1 A current rating.

Shielded: No – this is an unshielded connector, making it suitable for low-frequency signal applications but not for high-speed data or EMI-sensitive circuits.