Is there a pin-compatible replacement for TLC-MSMD300?

While SMD1812P300TF shares the same 1812 package and pinout, it is not a confirmed drop-in replacement. Differences in trip current and power dissipation mean it should be considered a functional alternate that requires engineering validation.

What risks should I check before replacing TLC-MSMD300?

Before replacing TLC-MSMD300, you must verify the hold current (Ih), max voltage (Vmax), and max fault current (Imax). Also check the trip current (It) and power dissipation (Pd), as mismatches can lead to nuisance trips or thermal problems.

TLC-MSMD300 Alternatives, Datasheet & Cross Reference | TLC Electronic

Finding a substitute for the TLC-MSMD300 PTC fuse requires matching the 3.0A hold current and 1812 package. Several alternatives exist, but careful review of trip current, power dissipation, and fault current ratings is essential for safe operation.

AI replacement insight

Electrical riskhigh

Mismatch in hold/trip current or power rating can cause malfunction or safety issues.

Package risklow

Multiple candidates are available in the same 1812 package.

Can it be replaced directly?

No, a direct drop-in replacement for TLC-MSMD300 is not confirmed. The best candidate, SMD1812P300TF, has different trip current and power ratings that must be evaluated by an engineer.

Best replacement path

SMD1812P300TF is the most promising candidate due to its matching 3.0A hold current and higher voltage rating.

Main risk

The primary risk is selecting a part with an incorrect hold current, which would compromise the circuit's overcurrent protection or cause nuisance tripping.

Recommended alternatives

A strong functional alternative in the same 1812 package with matching 3.0A hold current and higher voltage rating.

View details

Alternative comparison matrix

Feature / factor	TLC-MSMD300	SMD1812P300TF	SMD1812P350TF	Compatibility / risk
Package	1812	1812	1812	1812 — Form factor matches.; SMD1812P350TF: Form factor matches.
Current	6A	5A	35A?	5A / 35A? — Lower trip current may cause nuisance trips.; SMD1812P350TF: Max fault current may be lower, a safety risk.
Voltage	6.0V	8.0V	6.0V	8.0V / 6.0V — Higher voltage rating provides more margin.; SMD1812P350TF: Voltage rating matches, no extra margin.
Power	1.2W	0.8W	2.0W	0.8W / 2.0W — Lower power dissipation requires thermal analysis.; SMD1812P350TF: Higher power dissipation is acceptable.

Application & sourcing insights

Questions & answers

The best alternative found is SMD1812P300TF by RUILON. It matches the critical 3.0A hold current, 1812 package, and has a higher 8V voltage rating. However, its trip current and power dissipation differ, requiring engineering review.