Is there a pin-compatible replacement for TLC-PSMD100?

Yes, several 0805 package PTC fuses are pin-compatible, such as RUILON SMD0805P100TF and BNstar SMD0805-100C-12V. While they fit the footprint, electrical parameters like max fault current (Imax) differ and require careful review.

What risks should I check before replacing TLC-PSMD100?

The most critical risk is the maximum fault current (Imax). The TLC-PSMD100 is rated for 100A, while many alternatives are rated lower (e.g., 40A). Using a part with a lower Imax can cause the fuse to fail permanently in a high-current short circuit. Also verify trip time and resistance characteristics.

TLC-PSMD100 Alternatives, Datasheet & Cross Reference | TLC Electronic

TLC-PSMD100 is a popular 0805 PTC resettable fuse with a 1A hold current and 6V rating. Finding a substitute requires matching hold/trip currents and verifying the maximum fault current rating (Imax).

AI replacement insight

Electrical riskhigh

Lower Imax (40A vs 100A) is a critical safety difference.

Package risklow

All candidates match the 0805 package.

Can it be replaced directly?

No perfect drop-in replacement is identified. While several parts match the form and key currents, all have a lower maximum fault current (Imax) rating than the original's 100A, which is a critical safety parameter.

Best replacement path

BNstar's SMD0805-100C-12V offers matching hold/trip currents and a higher voltage rating, but requires checking if its lower 40A max fault current is sufficient for the application.

Main risk

The primary risk is the lower maximum fault current (Imax) of all candidates, which could lead to fuse failure and circuit damage under high-current fault conditions.

Recommended alternatives

Matches hold/trip current and package with a higher voltage rating, but has a lower max fault current (Imax).

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Alternative comparison matrix

Feature / factor	TLC-PSMD100	SMD0805-100C-12V	SMD0805P100TF	Compatibility / risk
Package	0805	0805	0805	0805 — Form and fit match.; SMD0805P100TF: Form and fit match.
Current	100A	40A	40A	40A — Max fault current (Imax) is significantly lower.; SMD0805P100TF: Max fault current (Imax) is significantly lower.
Voltage	6V	12V	6V	12V / 6V — Higher voltage rating provides more margin.; SMD0805P100TF: Max voltage matches.

Application & sourcing insights

Questions & answers

SMD0805-100C-12V by BNstar is a strong candidate, matching the 1A hold current and offering a higher 12V rating. However, its 40A max fault current is lower than the original's 100A and must be verified for your design.