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

While many parts are functionally identical, a true pin-compatible replacement must also match the PCB footprint, including the mounting boss. No candidates have been confirmed to include this feature, so datasheet and footprint verification is mandatory.

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

The main risk is mechanical: many substitutes lack the mounting boss, affecting stability. Also, some generic part numbers have different voltage ratings from different vendors, so always verify the datasheet for the specific part you buy.

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

The JST B4B-XH-AM(LF)(SN) is a common 4-pin, 2.5mm pitch straight header. While many alternatives exist in the XH connector family, careful verification of mechanical dimensions, especially the mounting boss, is required for a reliable replacement.

AI replacement insight

Package riskmedium

Most alternatives lack the mounting boss of the original JST part.

Electrical risklow

Many alternatives match the 3A/250V rating, but verification is still needed.

Can it be replaced directly?

No direct drop-in replacement has been confirmed. Several functional alternatives exist, but all require mechanical verification of the mounting footprint.

Best replacement path

Source a cross-vendor XH-series 4-pin straight header and verify its mechanical drawing against the JST original, paying close attention to the mounting boss.

Main risk

Mechanical mismatch due to the absence of a mounting boss on most alternatives, potentially impacting PCB stability.

Recommended alternatives

This DEALON header is a functional alternative but lacks the mounting boss found on the JST part; check mechanical drawings.

View details

Alternative comparison matrix

Feature / factor	B4B-XH-AM(LF)(SN)	XH-4PS	ZX-XH2.54-4PZZ-Y	Compatibility / risk
Pin Count	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	Straight, Through Hole, with Boss	Straight, Through Hole	Straight, Through Hole	Straight, Through Hole — Candidate lacks mounting boss.; ZX-XH2.54-4PZZ-Y: Candidate lacks mounting boss.
Voltage	250V	250V	250V	250V — Matched; ZX-XH2.54-4PZZ-Y: Matched
Current	3A	3A	3A	3A — Matched; ZX-XH2.54-4PZZ-Y: Matched

Application & sourcing insights

Questions & answers

The best alternatives are other XH-series 4-pin straight headers like Megastar's ZX-XH2.54-4PZZ-Y or DEALON's XH-4PS, provided the absence of a mounting boss is acceptable for your PCB design.