Is there a pin-compatible replacement for BAS20LT1G?

Yes, BAS21LT1G is a pin-compatible replacement from the same manufacturer. Other parts like MMBD1501A and BAS21S share the same SOT-23 package but require verification of electrical parameters for your specific application.

What risks should I check before replacing BAS20LT1G?

Key risks include differences in forward voltage (Vf), which affects power dissipation, and accidentally choosing a diode array instead of a single diode. Always verify the candidate's datasheet for its internal configuration.

BAS20LT1G Alternatives, Datasheet & Cross Reference | onsemi

BAS20LT1G is a 200V, 200mA general-purpose switching diode in a SOT-23 package from onsemi. This page provides analysis of potential alternatives, focusing on electrical and mechanical compatibility.

AI replacement insight

Package risklow

SOT-23 is a highly standardized package.

Electrical riskmedium

Must verify internal diode configuration (single vs. array) and check for Vf differences.

Sourcing risklow

Multiple strong alternatives exist from major and regional manufacturers.

Can it be replaced directly?

Yes, BAS21LT1G is a strong candidate for direct replacement, being from the same manufacturer and product family.

Best replacement path

BAS21LT1G from onsemi offers a direct upgrade path with a higher voltage rating.

Main risk

The primary risk is accidentally selecting a part with a different internal configuration, such as a diode array, which shares the same SOT-23 package.

Recommended alternatives

A pin-compatible upgrade from the same manufacturer with a higher voltage rating.

View details

Alternative comparison matrix

Feature / factor	BAS20LT1G	BAS21LT1G	MMBD1501A	BAS21S	Compatibility / risk
Package	SOT-23 (TO-236)	SOT-23 (TO-236)	SOT-23	SOT-23	SOT-23 (TO-236) — Identical package and pin count.; MMBD1501A: Same package family.; BAS21S: Same package family.
Voltage	200V	250V	200V	250V	250V / 200V — Higher voltage rating provides more design margin.; MMBD1501A: matched; BAS21S: Higher voltage rating.
Current	200mA	200mA	-	200mA	200mA — matched; BAS21S: matched
Trr	50ns	50ns	-	-	50ns — Reverse recovery time matches.
Vf	~1.25V @ 200mA	-	1.3V @ 200mA	-	1.3V @ 200mA — Slightly higher forward voltage may increase power loss.
Capacitance	5pF	-	4pF	-	4pF — Slightly lower capacitance is generally favorable.
Manufacturer	onsemi	-	-	GOODWORK	GOODWORK — Cross-vendor alternative requires sourcing qualification.

Application & sourcing insights

Questions & answers

BAS21LT1G from onsemi is an excellent alternative, offering the same performance with a higher voltage rating (250V vs 200V) in the same SOT-23 package.