Comparing Molex Power Connectors
When selecting power interconnects, Molex’s Mini-Fit and Micro-Fit families represent industry standards for high-density power delivery.
1. Molex Micro-Fit 3.0 (3.00mm Pitch)
- Current Rating: Up to 8.5A per circuit
- Wire Sizes: AWG 18-30
- Key Feature: Fully isolated terminals with TPA (Terminal Position Assurance) options in half the space of Mini-Fit.
2. Molex Mini-Fit Jr. (4.20mm Pitch)
- Current Rating: Up to 9.0A to 13.0A per circuit (depending on terminal material)
- Wire Sizes: AWG 16-28
- Key Feature: Heavy-duty positive lock latching; standard in ATX computer power supplies and telecom rectifiers.
Which One Should You Specify?
Choose Micro-Fit 3.0 when space on the PCB edge is constrained but you require robust 5A-8A delivery. Choose Mini-Fit Jr. when working with heavier gauge wire (AWG 16) and higher mechanical stress.