Is there a pin-compatible replacement for JK-MSMD050-30?

Yes, several pin-compatible replacements in the same 1812 package exist. JK-MSMD050-60V and TECHFUSE mSMD050-60V are both strong pin-compatible options.

What risks should I check before replacing JK-MSMD050-30?

The primary risk is a mismatch in hold current (Ih), which defines the normal operating current. Also check trip current (It) and resistance characteristics, as these affect protection timing and circuit behavior.

JK-MSMD050-30 Alternatives, Datasheet & Cross Reference | Jinrui Electronic Materials Co.

Find verified substitutes for the Jinrui JK-MSMD050-30, a 30V, 0.5A PTC resettable fuse in an 1812 package. This guide provides direct upgrade paths and functional alternatives with detailed engineering analysis.

AI replacement insight

Electrical risklow

Low if hold/trip currents match. Resistance differences may have minor impact.

Package risklow

All strong candidates are in the same 1812 package.

Sourcing risklow

Multiple vendors offer compatible parts, improving availability.

Can it be replaced directly?

Yes, JK-MSMD050-60V is a direct upgrade path. For a cross-vendor option, TECHFUSE mSMD050-60V is also a strong match with identical key ratings.

Best replacement path

The best replacement is JK-MSMD050-60V from the same manufacturer, offering an identical hold current and a higher 60V rating.

Main risk

The main risk when substituting is selecting a part with a different hold current, which can compromise circuit protection by tripping too late or too early.

Recommended alternatives

Upgrade from the same manufacturer with identical hold current and a higher 60V rating.

View details

Alternative comparison matrix

Feature / factor	JK-MSMD050-30	JK-MSMD050-60V	mSMD050-60V	Compatibility / risk
Package	1812	1812	-	1812 — Identical package ensures form and fit.
Voltage	30V	60V	-	60V — Higher voltage rating provides increased design margin.
Current	0.5A	1.0A	-	1.0A — Identical trip current.
Resistance	Rmin 0.20Ω, R1max 0.80Ω	Rmin 0.15Ω, R1max 1.4Ω	-	Rmin 0.15Ω, R1max 1.4Ω — Resistance values differ, may affect in-rush or post-trip behavior. Review required.

Application & sourcing insights

Questions & answers

The best alternative is JK-MSMD050-60V. It is made by the same manufacturer and has the same 0.5A hold current but a higher 60V voltage rating, making it a safe upgrade.