Is there a pin-compatible replacement for 0603L050SLYR?

Yes, several PTC fuses like BNstar's SMD0603-050C-12V share the same 2-pin 0603 package. While physically compatible, you must verify key electrical parameters like fault current and power dissipation to ensure functional safety.

What risks should I check before replacing 0603L050SLYR?

Key risks include using a part with a lower maximum fault current (Imax) or power dissipation, which could lead to fuse failure in an over-current event. Also, verify the trip time characteristics to ensure it protects your circuit as expected.

0603L050SLYR Alternatives, Datasheet & Cross Reference | Littelfuse

Finding a replacement for the Littelfuse 0603L050SLYR resettable PTC fuse involves matching its 0.5A hold current, 6V rating, and 0603 package. Several alternatives exist but require careful review of power dissipation and max fault current ratings.

AI replacement insight

Electrical riskmedium

Hold current matches, but fault current and power are lower on candidates.

Package risklow

All viable candidates are in the same 0603 package.

Sourcing risklow

Alternatives are available from multiple manufacturers.

Can it be replaced directly?

No perfect drop-in replacement was found. The closest alternatives, like SMD0603-050C-12V, have parametric differences in power and fault current ratings that require review.

Best replacement path

Prioritize candidates with a 0.5A hold current and 0603 package. The BNstar SMD0603-050C-12V is a promising option due to its superior voltage rating, but requires engineering validation.

Main risk

The primary risk is a mismatch in secondary protection parameters like maximum fault current (Imax) and power dissipation, which could compromise circuit safety.

Recommended alternatives

Alternative in same 0603 package with matching hold current but requires review of power and fault current ratings.

View details

Alternative comparison matrix

Feature / factor	0603L050SLYR	SMD0603-050C-12V	SMD0603P050TF	Compatibility / risk
Package	0603	0603	0603	0603 — Same 0603 package.; SMD0603P050TF: Same 0603 package.
Current	0.5A	0.5A	0.5A	0.5A — Hold current matches.; SMD0603P050TF: Hold current matches.
Voltage	6.0V	12.0V	6.0V	12.0V / 6.0V — Higher voltage rating provides more margin.; SMD0603P050TF: Voltage rating matches.
Power	0.6W	0.5W	0.5W	0.5W — Lower power dissipation, review required.; SMD0603P050TF: Lower power dissipation, review required.
Max Fault Current	50A	40A	~40A	40A / ~40A — Lower max fault current, review required.; SMD0603P050TF: Lower max fault current, review required.

Application & sourcing insights

Questions & answers

The BNstar SMD0603-050C-12V is a strong candidate, offering the same hold current and package with a higher voltage rating. However, its lower power and fault current ratings must be verified for your application.