Is there a pin-compatible replacement for A1251H-5P?

No direct pin-to-pin replacement has been verified. A1257H-5P is likely mechanically compatible but has a lower voltage rating. Other candidates belong to different connector systems and are not drop-in replacements.

What risks should I check before replacing A1251H-5P?

Key risks include mechanical incompatibility with the mating header, as different series are not interchangeable, and reduced electrical ratings, such as the lower voltage on the A1257H-5P.

A1251H-5P Alternatives, Datasheet & Cross Reference | CJT

Find alternatives for the CJT A1251H-5P, a 5-position, 1.25mm pitch connector housing. Review parametric differences and mechanical compatibility before selection.

AI replacement insight

Package riskhigh

Mating interface is critical and differs between connector series.

Electrical riskmedium

One candidate has a significantly lower voltage rating.

Can it be replaced directly?

No direct, fully-equivalent replacement is identified. All candidates require engineering review for either electrical or mechanical differences.

Best replacement path

Evaluate A1257H-5P if a 50V rating is acceptable. Otherwise, a system-level change to a new connector family like JST GH is required.

Main risk

The primary risk is mechanical incompatibility. Connectors must be replaced as a mating pair (housing and header).

Recommended alternatives

A similar 5-pin housing from the same manufacturer but with a lower voltage rating of 50V.

View details

Alternative comparison matrix

Feature / factor	A1251H-5P	A1257H-5P	GHR-05V-S	Compatibility / risk
Voltage	125V	50V	-	50V — Significant downgrade from target's 125V rating.
Manufacturer	CJT	CJT	-	CJT — Same manufacturer, suggests potential family compatibility.
Pitch Mm	1.25mm	1.25mm	1.25mm	1.25mm — matched; GHR-05V-S: matched
Positions	5	5	5	5 — matched; GHR-05V-S: matched
Material	Nylon 66	Nylon 66	PBT	Nylon 66 / PBT — matched; GHR-05V-S: Verify flammability and chemical resistance if critical.
Family	CJT A1251 Series	-	JST GH Series	JST GH Series — Not mechanically compatible; requires changing mating header.
Temperature	-40°C to +105°C	-	-40°C to +105°C	-40°C to +105°C — From ES data.

Application & sourcing insights

Questions & answers

A1257H-5P from CJT is a close match but has a lower voltage rating (50V vs 125V). For other options like JST's GHR-05V-S, you must also replace the mating PCB header.