Molex Micro-Fit & Mini-Fit Cross-Reference: 43025, 43045 & Drop-In Equivalents
Time:2026-11-09
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Micro-Fit and Mini-Fit are the two Molex series that show up whenever a board needs a locking, high-current wire-to-board connection — power supplies, motor drives, medical devices, LED lighting. If your BOM lists one of them, you already know the branded part carries a real price tag and a real lead time. A drop-in equivalent is how you fix both.
Same as with our JST line: we don’t print the Molex logo, and we don’t claim to be Molex. We make a footprint-compatible connector that mates with the same terminals and the same mating half, out of our factory in Shenzhen, China — factory-direct, low MOQ, short lead time.
Micro-Fit 3.0 — the 3.0 mm workhorse
Micro-Fit 3.0 is the 3.0 mm pitch series with the keyed, polarized housing and the reassuring positive latch. It carries real current in a compact body, which is why it’s everywhere from power tools to industrial controllers. The two numbers you’ll see most are 43025 (the dual-row header) and 43045 (the PCB-mounted receptacle). We build both footprints — single and dual row, vertical and right-angle.
Mini-Fit 3.0 — bigger, for bigger current
Mini-Fit 3.0 steps up to handle higher current for mains-adjacent and high-power boards. It’s the larger sibling with the same locking philosophy. Our Mini-Fit-compatible housings and headers cover the common 4.2 mm pitch configurations, including the dual-row versions your drawings already call for.
4.2 mm — the classic you didn’t know by name
That 4.2 mm white housing with the latch that shows up in so many ATX power and industrial builds? That’s the same family. We carry 4.2 mm compatible housings and headers in 2 to 8 circuits, straight and right-angle, so you can match the pin counts on your existing drawings.
At a glance
| Series | Pitch | Key part numbers | Our compatible |
|---|---|---|---|
| Micro-Fit 3.0 | 3.0 mm | 43025, 43045 | Header + receptacle, SMT / DIP |
| Mini-Fit 3.0 | 4.2 mm | Mini-Fit family | Housing + header, 2–12 circuits |
| 4.2 mm classic | 4.2 mm | ATX-style | White housing, straight / right-angle |
The reason these cross-reference pages exist is simple: a branded Micro-Fit or Mini-Fit order usually means premium pricing, lead times measured in weeks and MOQs that assume you’re a volume OEM. Our compatible parts keep the same footprint and cut all three — so a pilot run doesn’t have to be a leap of faith.
If you’re swapping an existing Molex part out, send us the drawing or part number and our engineers will confirm the drop-in match before you order. We’d rather verify than guess.
Frequently Asked Questions
Are these genuine Molex parts?
No. They are Molex-compatible equivalents — same pitch, footprint and terminal style, manufactured in our own Shenzhen factory.
Can I use them with genuine Molex terminals?
They are designed to be drop-in and mate with the same terminals and mating halves as the original series. We recommend using our matching terminals for guaranteed fit.
Do you support samples?
Yes. We supply samples so you can verify the footprint and mating before committing to production quantities.
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