Is there a pin-compatible replacement for B4B-XH-2(LF)(SN)?

While no replacements are guaranteed as pin-to-pin without verification, candidates like DEALON's XH-4PS have the same 2.5mm pitch, 4-pin straight configuration, making them highly likely to be compatible after checking the datasheet drawing.

What risks should I check before replacing B4B-XH-2(LF)(SN)?

The main risk is mechanical incompatibility. You must verify the substitute's datasheet to ensure its footprint, shroud dimensions, and pin length match your PCB layout and mating connector. Electrical ratings are generally well-matched.

B4B-XH-2(LF)(SN) Alternatives, Datasheet & Cross Reference | JST

The JST B4B-XH-2(LF)(SN) is a standard 4-pin, 2.5mm pitch straight header. Several functional alternatives with matching electrical and mechanical properties are available from other manufacturers, offering flexible sourcing options.

AI replacement insight

Electrical risklow

Multiple candidates match the 250V/3A rating of the target part.

Package riskmedium

While pitch and mounting style match, exact housing dimensions and pin lengths must be verified from datasheets.

Sourcing risklow

The XH connector family is a multi-sourced industry standard, providing many sourcing options.

Can it be replaced directly?

There are several strong candidates that match the key specifications, but none are pre-verified as drop-in. A datasheet review is required.

Best replacement path

Use a form-fit-function alternative from a compatible vendor like DEALON or Megastar after verifying mechanical drawings.

Main risk

The primary risk is minor differences in the connector's mechanical dimensions, such as the shroud height or footprint, which could affect PCB layout or mating.

Recommended alternatives

A 4-pin, 2.5mm pitch vertical header with matching electrical ratings. Verify mechanical fit before use.

View details

Alternative comparison matrix

Feature / factor	B4B-XH-2(LF)(SN)	XH-4PS	XHB-D-4A	ZX-XH2.54-4PZZ-Y	Compatibility / risk
Package	Through Hole, Straight	Through Hole, Vertical	Through Hole, Straight	Through Hole, Straight	Through Hole, Vertical / Through Hole, Straight — Mounting type matches.; XHB-D-4A: Mounting type matches.; ZX-XH2.54-4PZZ-Y: Mounting type matches.
Pitch	2.5mm	2.5mm	2.5mm	2.5mm	2.5mm — Standard XH pitch.; XHB-D-4A: Standard XH pitch.; ZX-XH2.54-4PZZ-Y: Standard XH pitch.
Pin Count	4	4	4	4	4 — Pin count matches.; XHB-D-4A: Pin count matches.; ZX-XH2.54-4PZZ-Y: Pin count matches.
Voltage	250V	250V	250V	250V	250V — Voltage rating matches.; XHB-D-4A: Voltage rating matches (per datasheet).; ZX-XH2.54-4PZZ-Y: Voltage rating matches.
Current	3A	3A	3A	3A	3A — Current rating matches.; XHB-D-4A: Current rating matches (per datasheet).; ZX-XH2.54-4PZZ-Y: Current rating matches.

Application & sourcing insights

Questions & answers

Several strong functional alternatives exist, such as DEALON XHB-D-4A or Megastar ZX-XH2.54-4PZZ-Y. They match in pitch, pin count, and electrical ratings, but require mechanical verification.