Is there a pin-compatible replacement for SMD1812-300C-16V?

While several parts share the 1812 package, no direct pin-to-pin replacement has been confirmed. Candidates like BHFUSE BSMD1812-300-16V require review of key electrical parameters like max fault current before use.

What risks should I check before replacing SMD1812-300C-16V?

The primary risk is a mismatch in the maximum fault current (Imax). The target is rated for 100A, while some alternatives are rated lower (e.g., 40A). Exceeding this can cause device failure. Also check initial and post-trip resistance.

SMD1812-300C-16V Alternatives, Datasheet & Cross Reference | BNstar

Finding a substitute for the BNstar SMD1812-300C-16V PTC fuse requires matching hold current (3.0A), voltage (16V), and package (1812). Key alternatives exist but require verification of max fault current.

AI replacement insight

Electrical riskhigh

Lower Imax on candidates (40A vs 100A) is a critical safety and reliability concern.

Package risklow

Candidates share the same 1812 package, ensuring form and fit compatibility.

Can it be replaced directly?

No direct drop-in replacement is confirmed. All candidates require engineering review, primarily for the max fault current rating.

Best replacement path

Use BHFUSE BSMD1812-300-16V after verifying the application's maximum possible fault current is safely below 40A.

Main risk

The most significant risk is the lower maximum fault current (Imax) of available alternatives, which could lead to fuse failure.

Recommended alternatives

A functional alternative in a matching 1812 package with identical key ratings, but a much lower max fault current.

View details

Alternative comparison matrix

Feature / factor	SMD1812-300C-16V	BSMD1812-300-16V	BSMD1812-300-24V	Compatibility / risk
Package	1812	1812	1812	1812 — Form and fit match.; BSMD1812-300-24V: Form and fit match.
Current	100A	40A	40A	40A — Max fault current is significantly lower.; BSMD1812-300-24V: Max fault current is significantly lower.
Voltage	16V	16V	24V	16V / 24V — Max voltage matches.; BSMD1812-300-24V: Higher voltage rating is a safe upgrade.
Resistance	0.040Ω	0.05Ω	0.012Ω	0.05Ω / 0.012Ω — Max post-trip resistance is higher.; BSMD1812-300-24V: Initial resistance is slightly higher.

Application & sourcing insights

Questions & answers

BHFUSE BSMD1812-300-16V is a strong functional alternative, matching hold current, voltage, and package. However, its lower max fault current (40A vs 100A) must be verified for your application.