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

Several parts like XH-4PS offer the same form, fit, and function, making them potential pin-compatible replacements. However, pin-to-pin compatibility is only guaranteed after you compare the mechanical drawings in the datasheets to verify shroud dimensions and pin lengths.

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

The main risk is mechanical mismatch. Before replacing, you must verify the candidate's datasheet to ensure the shroud dimensions, pin length, and overall footprint match your PCB layout. Also, check that the electrical ratings (voltage and current) are sufficient for your application.

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

B4B-XH-A-E(LF)(SN) is a standard 4-pin, 2.5mm pitch straight header from JST. Several functional alternatives from other manufacturers are available, offering a similar form factor and electrical performance.

AI replacement insight

Electrical risklow

Many alternatives match the 3A/250V rating.

Package riskmedium

Requires verification of mechanical drawings for shroud dimensions and pinout.

Sourcing risklow

The XH series is a popular standard with many suppliers.

Can it be replaced directly?

No direct, verified pin-to-pin replacement is listed, but several strong `form_fit_function` alternatives from other manufacturers exist. These require datasheet review to confirm mechanical compatibility.

Best replacement path

Use a cross-vendor XH-compatible 4-pin straight header like XH-4PS or ZX-XH2.54-4PZZ-Y after verifying the mechanical drawing in the datasheet.

Main risk

The primary risk is mechanical incompatibility. While pitch and pin count may match, the plastic shroud's dimensions or pin length could differ, preventing a proper fit on the PCB or with the mating connector.

Recommended alternatives

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

View details

Alternative comparison matrix

Feature / factor	B4B-XH-A-E(LF)(SN)	XH-4PS	ZX-XH2.54-4PZZ-Y	Compatibility / risk
Positions	4	4	4	4 — matched; ZX-XH2.54-4PZZ-Y: matched
Pitch	2.5mm	2.5mm	2.5mm	2.5mm — matched; ZX-XH2.54-4PZZ-Y: matched
Package	Through Hole, Straight	Through Hole, Straight	Through Hole, Straight	Through Hole, Straight — Orientation matches target's top-entry.; ZX-XH2.54-4PZZ-Y: Orientation matches target's top-entry.
Electrical	3A / 250V	3A / 250V	3A / 250V	3A / 250V — matched; ZX-XH2.54-4PZZ-Y: matched

Application & sourcing insights

Questions & answers

The best alternatives are likely cross-vendor compatible parts like XH-4PS or ZX-XH2.54-4PZZ-Y. They match key electrical and physical specs but require you to check the datasheet's mechanical drawing to ensure a perfect fit.