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Molex Mini-Fit Jr — Specs and Wiring Guide

The Molex Mini-Fit Jr is one of the most recognized power connectors in the electronics industry, used in everything from computer power supplies to industrial control panels and automotive interior modules. Operating at a 4.2mm pitch with 13 amps per contact and a 600 VAC voltage rating, the Mini-Fit Jr delivers substantial power handling in a relatively compact package. The connector is available in configurations from 2 to 24 circuits in single and dual-row arrangements, and features Molex's blind-mate design with a positive-lock latch. The Mini-Fit Jr is the basis for the ATX computer power supply connector and is found in countless industrial, medical, and transportation applications worldwide. Its broad availability, low cost, and proven reliability make it a default choice for internal power distribution.

Specifications

Pin Count4
Wire Gauge Range22–16 AWG
Voltage Rating600 VAC
Current Rating13A continuous
IP RatingIP20
Mating Cycles30
Operating Temp-40°C to +105°C

Key Features

  • Industry-standard 4.2mm pitch power connector
  • 13A per contact at up to 600 VAC
  • Available in 2 to 24-circuit configurations
  • Blind-mate design with positive-lock latch
  • Basis for ATX computer power connectors
  • Available in panel-mount and free-hanging versions

Compatible Terminals & Components

ComponentPart Number
Mini-Fit Jr Female Terminal (22–16 AWG)39-00-0038
Mini-Fit Jr Male Terminal (22–16 AWG)39-00-0039
Mini-Fit Jr 4-Circuit Receptacle5557-04R
Mini-Fit Jr 4-Circuit Plug5559-04P

Frequently Asked Questions