Molex Micro-Fit 3.0 Cross-Reference Substitute Options

Molex Micro-Fit 3.0 Cross-Reference and Substitute Options for Russian and CIS Buyers: When a Same-Pitch Alternate Works and When It Must Not

Molex Micro-Fit 3.0 (3.0 mm pitch wire-to-board power connector, housings 43645/43650 and terminals 43030/43031) and TE Connectivity Micro MATE-N-LOK (3.0 mm pitch — this is the 3.0 mm micro variant, not the 6.35 mm Universal MATE-N-LOK) overlap in pitch, voltage rating and current class, but they do not mate to each other and the locking-ramp geometry, polarization key, housing length, PCB footprint and crimp contact geometry all differ. A same-pitch alternate must be qualified per line, not assumed. This article walks a Russian or CIS buyer through ten engineering axes for the most common substitutes and gives a working cross-reference workflow.

By the IC Source Direct supply-chain desk. Data through Q3 2026.

Data Notes

Molex publishes the Micro-Fit 3.0 family datasheet covering the 43645 (right-angle through-hole header), 43650 (vertical through-hole header), 43030 (female crimp terminal) and 43031 (male crimp terminal) lines, with pitch, current rating, voltage rating, mating-cycle count and reflow profile values cited below taken from the manufacturer's published ranges for the series. Where the value depends on the specific position count, wire gauge or stack height, we mark the axis as unknown.
TE Connectivity publishes the Micro MATE-N-LOK 3.0 mm family datasheet as a separate document covering 794617 (plug housing), 794618 (receptacle housing), 770968 (socket contact) and 770967 (pin contact). Values cited for that family come from that datasheet. Where we cite a substitute family without an in-catalog part, the values are from the manufacturer's published datasheet and not from our catalog's specifications block.
We are an independent connector and interconnect distributor, not an authorized distributor for Molex or for TE Connectivity. We do not carry the manufacturer warranty. We do not treat any pair of series on this page as a verified-equivalent swap. The default claim level is level 2 — mating interface matches on paper only. Verify against the original manufacturer datasheet and your own qualification process.
Article first published 2026-09-15. Last updated 2026-09-15.

What a Russian or CIS buyer usually asks first

A typical query looks like «аналог Molex Micro-Fit 3.0 купить» and «чем заменить Molex Micro-Fit 3.0 без переделки платы». The Micro-Fit 3.0 family is one of the most widely specified 3.0 mm pitch wire-to-board power connectors in industrial control and white-goods builds, and it sits squarely in the cross-reference question a Russian or CIS procurement team asks when allocation tightens. The same query also arrives as «Micro-Fit 3.0 — поставка в Россию в малом объёме» and «TE Micro MATE-N-LOK аналог на ту же посадку».

Before touching any cross-reference, fix one thing on your side. The Micro-Fit 3.0 family is a wire-to-board crimp family with a single-row or dual-row polarized housing, a locking ramp on the wire side, and a through-hole vertical or right-angle header on the PCB side. The pitch is 3.0 mm. The current rating is up to roughly 8.5 A per circuit depending on wire gauge and circuit count, and the voltage ceiling is 250 V. Any substitute family must match all three: pitch, current/voltage class, and the wire-to-board crimp topology. A substitute that drops one of the three is not a substitute. That is the first axis, and it dominates everything below.

The ten-axis comparison

For each axis below, we mark matched where the published Molex and TE datasheets agree within the typical engineering tolerance, differs where the published data does not agree, and unknown where we cannot pull a verifiable value from the datasheet or from our catalog's specifications block. The default claim level on this comparison is level 2 — mating interface matches on paper only for the closest candidates and level 1 — visually similar outline for everything else. A buyer who needs anything stronger must do the qualification themselves.

1. Form / fit outline — differs

The Micro-Fit 3.0 housing is a polarized single-row or dual-row PA66 / nylon body with a positive locking ramp on the wire side and a series of through-hole PCB tails on the header side. The TE Micro MATE-N-LOK housing is a similar outline — single or dual row, polarized, latch on the wire side — but the locking ramp geometry, the panel-cutout footprint, and the polarization key position are not identical. A Micro-Fit 3.0 plug cannot mate to a Micro MATE-N-LOK header, even though the pitch is the same. The form is similar; the mating interface is not. This is the axis that decides whether a same-pitch alternate can substitute at all, and the answer here is no unless the PCB layout is being redesigned to accept the alternate header.

2. Dimensions — matched on pitch, differs in outline

Pitch on Micro-Fit 3.0 is 3.0 mm; pitch on Micro MATE-N-LOK is 3.0 mm. Position count families overlap partially — Micro-Fit 3.0 is offered in 2 through 24 circuits single row and dual row, Micro MATE-N-LOK in 2 through 24 circuits single and dual row — but the housing length, the locking-ramp-to-ramp distance, and the PCB tail footprint are not the same. The pitch is matched but the external housing dimensions and the PCB footprint are not, so a board designed for Micro-Fit 3.0 cannot accept a Micro MATE-N-LOK header without a PCB respin.

3. Pin-to-pin — differs

Pin numbering convention differs between the two families: the wire-side numbering starts at the locking-ramp edge on Micro-Fit 3.0, while the Micro MATE-N-LOK numbering starts at the polarization key. The crimp contact geometry is also not interchangeable — a 43030-series Molex female crimp terminal will not retain in a 794617 TE housing, and a 770968 TE socket contact will not retain in a 43645 Molex housing. Pin-to-pin is not compatible at the contact level, and a substitution that swaps only the housings without changing the contacts is mechanically wrong.

4. Electrical parameters — matched within current class

Both families are rated up to roughly 8.5 A per circuit depending on wire gauge, with a 250 V ceiling. The exact derating curves differ — Micro-Fit 3.0 publishes a steeper derating above 4-6 circuits in dual row, while Micro MATE-N-LOK publishes a slightly different curve shape — so a buyer carrying more than 6 A on a specific line in a 12-circuit dual-row Micro-Fit 3.0 build must check the candidate's curve for the same circuit count. Electrical parameters are in the same class but not identical. Contact resistance, insulation resistance, and dielectric withstanding voltage values are published per family and must be checked against the actual datasheet for the exact SKU.

5. Mechanical parameters — differs

Mating cycle ratings are similar — both families publish a 30-cycle typical rating on the standard housings — but retention force on the crimp side, latch-hold force on the housing, and the locking-ramp audible-click threshold differ. Wire gauge range on the crimp side is the same (AWG 20-30), but the crimp tooling is family-specific. A Molex 43030 terminal is crimped with a Molex 63811-series hand tool or equivalent; a TE 770968 terminal is crimped with a TE 91510-series hand tool or equivalent. Crimp pull-force tests must be re-run for the substitute family.

6. Environmental class — matched within commercial / industrial band

Both families operate in the -40 °C to +105 °C commercial / industrial band. Neither is automotive-grade by default — neither Micro-Fit 3.0 nor Micro MATE-N-LOK is AEC-Q-qualified as a family, although both manufacturers offer automotive-validated variants under different catalog numbers. If the BOM line calls for an AEC-Q-qualified part, the cross-reference question does not apply, and the buyer must source the automotive-validated variant of each family separately.

7. Ingress protection — differs (none by default)

Neither Micro-Fit 3.0 nor Micro MATE-N-LOK is rated IP67 in the standard through-hole header configuration. Both families are designed for sealed enclosures where the connector itself is not the seal. If the original design relies on a sealed wire entry (M12, Deutsch DT, or a sealed circular), neither family can replace it, and a substitution that loses the enclosure's IP rating fails qualification regardless of pitch or current class.

8. Temperature range — matched within commercial / industrial band

Both families publish -40 °C to +105 °C as the standard operating range. Reflow profiles differ slightly between the SMT variants (Micro-Fit 3.0 SMT is available in selected position counts) and the through-hole variants that dominate the catalog. Through-hole wave or selective solder is the typical process for both families; a SMT-to-THT process swap is its own change.

9. Materials / plating — differs

Micro-Fit 3.0 uses phosphor-bronze contacts with tin or selective gold plating in a PA66 housing on the standard line, with LCP variants on higher-temperature SKUs. Micro MATE-N-LOK uses phosphor-bronze contacts with tin or gold plating in a similar nylon family. The housing material difference is small at the standard temperature range and grows at the upper end — if the design runs at the +105 °C ceiling continuously, the LCP variants of Micro-Fit 3.0 are not equivalent to the standard PA66 Micro MATE-N-LOK housings, and the substitute candidate must be re-validated.

10. Certifications — unknown without file number

Both Molex and TE publish UL file numbers for selected Micro-Fit 3.0 and Micro MATE-N-LOK positions. The specific UL listing depends on the exact part number, the position count, and the plating code. Do not assume that a Micro-Fit 3.0 line item and a Micro MATE-N-LOK line item on the same BOM share certifications. For Russian and CIS imports, EAC/TR CU conformity assessment is the buyer's responsibility — we provide commercial invoice, packing list, and country-of-origin documents on request, but we do not issue EAC declarations on the buyer's behalf, and we cannot confirm compliance for a part we do not physically see.

Claim level on this comparison

This is a claim level 2 — mating interface matches on paper only comparison on the pitch axis between Micro-Fit 3.0 and Micro MATE-N-LOK. It is level 1 — visually similar outline on the locking-ramp, polarization, and crimp-contact axes where the two families differ entirely. We do not represent either family as a verified-equivalent swap for the other. We do not represent either as pin-to-pin identical to a competing series from JST, Hirose, or Würth Elektronik. The 10-axis table above is the engineering artifact a buyer needs to start their own qualification.

When you must not substitute Micro-Fit 3.0 with another 3.0 mm pitch candidate

A wire-to-board crimp connector carrying a power path cannot be swapped on outline alone. Three concrete failure cases:

The original line carries more than 8 A per circuit in a multi-circuit dual-row build. Micro-Fit 3.0 publishes a derating curve that drops per-circuit current as the dual-row circuit count grows. A same-pitch alternate with a flatter derating curve may look equivalent on paper but fail thermally under load. Re-run the derating against the actual candidate datasheet for the same circuit count.
The original line is in a sealed assembly (IP54 or higher enclosure rating). Neither Micro-Fit 3.0 nor Micro MATE-N-LOK is sealed in the through-hole standard configuration. The seal must come from the enclosure, the cable gland, or a different sealed connector family. Substituting the connector with a different unsealed series does not recover the IP rating.
The original line carries a safety-circuit signal — a fault output, an interlock, an emergency-stop loop. Cross-referencing a safety signal path with an unqualified same-pitch alternate is not a sourcing decision; it is a qualification decision that must be made by the buyer's safety engineering function with the alternate manufacturer's documentation in hand.

How IC Source Direct handles the cross-reference request

When a Russian or CIS buyer sends us a BOM with a Molex Micro-Fit 3.0 line item and asks for a same-pitch alternate or a different-brand substitute, the workflow is the same as for any other shortage-driven substitution:

Send the BOM or shortage list. A CSV or Excel with MPN, quantity, and target unit price is enough; we also accept PDF mark-ups of the original BOM. Submit through the procurement desk at our procurement page or by mailing the file to our Shenzhen sourcing desk.
We match each line independently. A Micro-Fit 3.0 line is quoted against Micro-Fit 3.0 stock in our catalog where the buyer wants the original family, and against three to five cross-reference candidates from compatible 3.0 mm pitch families (TE Micro MATE-N-LOK, Würth Elektronik WR-MPC3 3.0 mm, and other catalog entries) where the buyer is willing to accept a different brand or a PCB rework.
We deliver a per-line substitution table with pitch, position count, current rating, voltage rating, housing material, plating, mating cycle rating, and a column marked "unknown" for any axis we cannot verify from the manufacturer's published datasheet or from our catalog's specifications block.
Final qualification stays with the buyer's engineering team. We never tell a buyer "you can substitute X for Y." We provide the engineering data and the supply options; the buyer decides.

Where IC Source Direct fits, and where it does not

IC Source Direct is an independent connector and interconnect distributor based in Shenzhen, with a dedicated weekly consolidated air lane serving Russia and the CIS under DDP door-to-door terms where the quotation states it. We screen end users and end uses, classify before quoting, and decline transactions that cannot be screened.

We are the right fit for machine-down urgent spares, allocation-driven substitution, multi-brand mixed BOMs, small batches below manufacturer MOQ, EOL and last-time-buy support, and cross-reference research where the buyer is willing to accept the engineering responsibility for the substitution. We are not the right fit for safety-critical new designs that require an authorized distributor's traceability chain, regulated medical devices that need an ISO 13485-documented supply chain, and parts where the buyer needs the original manufacturer's warranty to flow through to the end customer. Those requests we decline and refer back to the manufacturer or to an authorized channel.

Next step

Send your BOM or shortage list to our procurement desk or to baojia for a per-line parse, and we will return a cross-reference table for any line that is in shortage — including the axes we can verify and the axes we cannot.

FAQ

Is TE Micro MATE-N-LOK a drop-in substitute for Molex Micro-Fit 3.0?

No. Both share 3.0 mm pitch and roughly 8.5 A per circuit / 250 V ratings, but the locking ramp, polarization key, housing length, PCB footprint, and crimp contact geometry all differ. A Micro-Fit 3.0 plug cannot mate to a Micro MATE-N-LOK header. A substitution requires a PCB layout review and a re-crimp of the wire side.

What buyer question in Russian maps to the Micro-Fit 3.0 substitution?

Typical queries are «аналог Molex Micro-Fit 3.0 купить» and «чем заменить Molex Micro-Fit 3.0 без переделки платы». Both arrive at the same procurement desk and are handled per line, not as a paired substitution.

Does IC Source Direct issue EAC or TR CU declarations for Molex Micro-Fit 3.0 imports?

No. We provide commercial invoice, packing list, and country-of-origin documents. The buyer is responsible for EAC/TR CU conformity assessment at the point of import. We do not issue conformity declarations on the buyer's behalf.

Is Micro-Fit 3.0 a verified-equivalent swap for Micro MATE-N-LOK?

No, and we do not represent either family as a verified-equivalent swap for the other. We publish a per-line substitution table with the axes matched, differed, and unknown; the buyer's engineering team makes the final qualification call.

What is the minimum information to send for a Micro-Fit 3.0 cross-reference quote?

MPN, quantity per line, target unit price or target total, and the application context: signal, low-current power, or higher-current power distribution. We can parse CSV, Excel, or PDF mark-ups of the original BOM.

Can Micro MATE-N-LOK carry the same current as Micro-Fit 3.0 in a 12-circuit dual-row build?

Both publish up to 8.5 A per circuit on the upper end of the derating curve, but the exact derating curve shape differs by circuit count. The 12-circuit dual-row case must be checked against the alternate's published derating curve, not assumed equivalent on the headline rating.

What happens if the cross-reference line is in shortage at IC Source Direct?

We return the per-line substitution table with three to five cross-reference candidates from compatible 3.0 mm pitch families, mark the axes that match, differ, and are unknown, and the buyer decides. We do not pick a winner on the buyer's behalf.