Specifications
| Pitch | 4.2 mm |
|---|---|
| Contacts | 2–24 |
| Rows | one or two |
| Current per contact | 9 A |
| Voltage | 600 V |
| Wire | AWG 24–16 |
| Latch | yes, a tab to press |
| Mating | wire-to-board and wire-to-wire |
| Maker | Molex |
| Housing | 5557 (39-01-…) |
| Contact | 5556 · 5558 |
| Board header | 5566 |
Lookalikes and how to tell them apart
4.2 mm pitch, usually two rows, a latch and a polarised housing. Micro-Fit 3.0 is the smaller 3.0 mm version.
| Connector | Pitch | Latch | Per contact |
|---|---|---|---|
| Molex Mini-Fit Jr | 4.2 mm | yes, a tab to press | 9 A |
| Molex Micro-Fit 3.0 | 3.0 mm | yes, a tab to press | 8.5 A |
| JST VH | 3.96 mm | yes, a tab to press | 10 A |
Before you plug it in
Inside appliances and power supplies these connectors can carry mains voltage. Unplug the device and wait for the capacitors to discharge before you touch them.
Crimp terminals need the crimper die made for their size: pliers crush them and the contact works loose. Housings and terminals of different series don’t mix, even at the same pitch.
The current rating is a maximum per contact, at the wire size the maker states. With thinner wire, or with every contact carrying current, stay well below it.
Open the connector identifier →Not sure it is this one? Enter the pitch, the contacts and where you found it: the identifier compares 22 connector families.
Other connectors
JST SH JST GH Molex PicoBlade Hirose DF13 JST ZH JST PH Grove JST XH JST SM JST RCY Molex KK 254 Dupont Servo plug Molex Micro-Fit 3.0 JST VH XT30 XT60 XT90 Deans (T-plug) Anderson Powerpole DC barrel plug
Frequently asked questions
What is the pitch of the Molex Mini-Fit Jr connector?
4.2 mm between the centres of two neighbouring contacts.
How much current can a Molex Mini-Fit Jr connector carry?
9 A per contact, at up to 600 V, according to Molex.
Figures from the makers’ catalogues and datasheets. Ratings are maxima: derate for thin wire and for many loaded contacts.