Is there a pin-compatible replacement for ZX-MX1.25-4PLT?

CJT's A1257WV-S-4P-LCP appears to be pin-compatible in form and footprint, but has a significantly lower voltage rating (50V vs 125V). No direct pin-for-pin replacement with identical ratings has been identified in this review. Always verify datasheet dimensions before layout.

What risks should I check before replacing ZX-MX1.25-4PLT?

Key risks include: 1) Package Mismatch: Ensure the replacement is vertical SMT, not through-hole or right-angle. 2) Electrical Downgrade: Some alternatives have lower voltage ratings (e.g., 50V). 3) Mating Incompatibility: Ensure the replacement is part of the same connector family (e.g., PicoBlade compatible) to mate correctly.

ZX-MX1.25-4PLT Alternatives, Datasheet & Cross Reference | Megastar

ZX-MX1.25-4PLT is a 4-pin, 1.25mm pitch vertical SMT header from Megastar, compatible with the PicoBlade connector system. Finding a direct replacement requires matching the vertical orientation, SMT footprint, and 125V rating.

AI replacement insight

Package riskhigh

Many alternatives have different mounting (THT) or orientation (right-angle).

Electrical riskmedium

One strong form-fit candidate has a significantly lower voltage rating.

Sourcing risklow

Many functional alternatives from various manufacturers are available.

Can it be replaced directly?

No direct, fully-rated replacement was found. A1257WV-S-4P-LCP is a potential form-fit match but has a lower voltage rating, requiring engineering review.

Best replacement path

A form-factor match with a voltage downgrade (A1257WV-S-4P-LCP) or an electrical match with a form-factor change (e.g., ZX-MX1.25-4PZZ).

Main risk

The primary risk is accepting a substitute with a lower voltage rating or a different physical form factor (mounting type or orientation).

Recommended alternatives

A form-fit match with a lower voltage rating (50V vs 125V) that requires careful engineering review.

View details

Alternative comparison matrix

Feature / factor	ZX-MX1.25-4PLT	A1257WV-S-4P-LCP	ZX-MX1.25-4PWT	ZX-MX1.25-4PZZ	Compatibility / risk
Package	4-pin SMT Header, Vertical	4-pin SMT Header, Vertical	SMT, Right Angle	Through Hole, Vertical	4-pin SMT Header, Vertical / SMT, Right Angle / Through Hole, Vertical — Form factor appears to match based on datasheet and discovery evidence.; ZX-MX1.25-4PWT: Different orientation requires mechanical and layout changes.; ZX-MX1.25-4PZZ: Requires PCB redesign.
Voltage	125V AC/DC	50V AC/DC	125V AC/DC	125V AC/DC	50V AC/DC / 125V AC/DC — Significant voltage downgrade, requires circuit validation.; ZX-MX1.25-4PWT: matched; ZX-MX1.25-4PZZ: matched
Current	1.0A	1A	1.0A	1.0A	1A / 1.0A — matched; ZX-MX1.25-4PWT: matched; ZX-MX1.25-4PZZ: matched
Application	PicoBlade Compatible	PicoBlade Compatible	-	-	PicoBlade Compatible — Both parts are in the same connector family, ensuring mating compatibility.

Application & sourcing insights

Questions & answers

The best alternative depends on design flexibility. For a similar form factor but lower voltage, CJT's A1257WV-S-4P-LCP is an option, but requires careful review of its 50V rating. For the same electrical specs but different mounting, several through-hole or right-angle SMT options exist.