Is there a pin-compatible replacement for B03B-XASK-1-A(LF)(SN)?

No direct pin-compatible replacement has been identified. While some alternatives have the same pin count and pitch, they belong to the XH connector family, which is not mechanically compatible with the target's XA family locking shroud.

What risks should I check before replacing B03B-XASK-1-A(LF)(SN)?

The main risk is mechanical incompatibility. Verify the PCB footprint dimensions from the datasheets. Crucially, the candidate will not mate with the original XA series housing. You must also replace the mating connector in your design.

B03B-XASK-1-A(LF)(SN) Alternatives, Datasheet & Cross Reference | JST

Finding a substitute for the JST B03B-XASK-1-A(LF)(SN) requires careful review. While many 3-pin, 2.5mm headers exist, the target's XA series has a unique locking feature not found in common XH series alternatives.

AI replacement insight

Package riskhigh

Candidate connectors (XH series) have a different shroud and lack the locking feature of the target (XA series).

Application riskhigh

The original mating connector will not fit the substitute, requiring a system-level design change.

Can it be replaced directly?

No, there are no direct, pin-to-pin replacements among the candidates reviewed. The primary issue is the mechanical incompatibility between the target's JST XA series and the candidates' XH series.

Best replacement path

Source another JST XA series connector or a verified cross-reference. Using an XH series part requires changing the mating connector and verifying the PCB footprint.

Main risk

Mechanical Mismatch

Recommended alternatives

A 3-pin, 2.5mm pitch header from a different connector family; requires mechanical and mating part verification.

View details

Alternative comparison matrix

Feature / factor	B03B-XASK-1-A(LF)(SN)	XH-D-3A	ZX-XH2.54-3PZZ-Y	Compatibility / risk
Series	XA Series	XH Series	XH Series	XH Series — Target is JST XA series, which has a locking ramp. Not mate-compatible.; ZX-XH2.54-3PZZ-Y: Target is JST XA series, which has a locking ramp and different shroud. Not mate-compatible.
Package	Through Hole, Shrouded, Locking	Through Hole	Through Hole	Through Hole — Footprint requires verification due to series mismatch.; ZX-XH2.54-3PZZ-Y: Footprint requires verification due to series mismatch.
Current	3A	3A	3A	3A — matched; ZX-XH2.54-3PZZ-Y: matched
Voltage	250V	250V	250V	250V — matched; ZX-XH2.54-3PZZ-Y: matched
Temperature	-25°C to +85°C	-	-25°C to +85°C	-25°C to +85°C — matched

Application & sourcing insights

Questions & answers

The best alternative is another XA series connector. If unavailable, candidates like Megastar's ZX-XH2.54-3PZZ-Y can be considered, but they are XH series and will require changing the mating connector and verifying the PCB footprint.