MiniFit

MiniFit is a family of electrical connectors manufactured by Molex, commonly referred to as Mini-Fit Jr. It is designed for power and signal interconnections in consumer electronics, automotive, and industrial equipment. The series uses a 4.2 mm pitch and supports multiple circuits in a single housing, enabling compact, high-current connections. Terminals are crimped and mate with female housings and male receptacles; many variants feature polarisation keys and optional locking latches to prevent mis-mating and to provide a secure connection. The system is modular, with a range of wire-to-wire, wire-to-board, and board-to-board configurations, available in various circuit counts from 2 up to 24 or more, depending on the housing. The contacts are designed to carry relatively high current per circuit for a compact connector, and the assembly is rated for repeated mating cycles.

Applications and use: The Mini-Fit Jr. family is widely used in personal computers for power distribution, notably the 24-pin main motherboard power connector and the 4- and 8-pin CPU power connectors. It is also employed in automotive electronics, consumer appliances, and industrial equipment due to its balance of current capability, size, and mating reliability.

Variants and related series: The term Mini-Fit is often used interchangeably with the Mini-Fit Jr. family; Molex also offers related families with different pitches and locking styles. Mini-Fit should not be confused with Micro-Fit, which uses a 3.0 mm pitch, or with other Molex connector series.

History: Introduced in the 1990s, the Mini-Fit Jr. family became a standard solution for compact, high-current interconnections in computers and other devices, and it has since seen widespread adoption across various industries.