Is there a pin-compatible replacement for 1SMA4741A?

Several parts like 1SMA4742A and 1SMA4740A share the same SMA package and pinout. However, their Zener voltages (12V and 10V respectively) differ from the 11V target, so they are not drop-in replacements without engineering review.

What risks should I check before replacing 1SMA4741A?

The primary risk is the Zener voltage (Vz). Ensure your circuit can tolerate a different regulation voltage (e.g., 10V, 12V, or 13V). Also verify power dissipation, dynamic impedance (Zzt), and reverse leakage current from the datasheet.

1SMA4741A Alternatives, Datasheet & Cross Reference | GOODWORK

1SMA4741A is a 1W, 11V Zener diode in a common SMA package. Alternatives exist within the 1SMA47xx series and other families, but require careful review of the Zener voltage.

AI replacement insight

Electrical riskmedium

Zener voltage is a critical parameter; most alternatives have a different Vz.

Package risklow

The SMA package is common, and many alternatives share the same footprint.

Sourcing risklow

Zener diodes are widely available from multiple manufacturers.

Can it be replaced directly?

No direct drop-in replacement has been identified. All close alternatives have a different Zener voltage and require engineering validation.

Best replacement path

Evaluate 1SMA4742A for its similar characteristics and common use as a voltage step-up in the same series.

Main risk

The main risk is functional failure or circuit damage due to incorrect voltage regulation from a substitute with a different Zener voltage.

Recommended alternatives

A strong parametric alternative in the same package and power rating, with a slightly higher 12V Zener voltage.

View details

Alternative comparison matrix

Feature / factor	1SMA4741A	1SMA4742A	1SMA4740A	1SMA5928BT3G	Compatibility / risk
Package	SMA	DO-214AC/SMA	SMA (DO-214AC)	SMA (DO-214AC)	DO-214AC/SMA / SMA (DO-214AC) — Candidate and target packages are form-fit compatible.; 1SMA4740A: Candidate and target packages are form-fit compatible.; 1SMA5928BT3G: Candidate and target packages are form-fit compatible.
Voltage	11.0V	12.0V	10.0V	13.0V	12.0V / 10.0V / 13.0V — Candidate Zener voltage is 9% higher.; 1SMA4740A: Candidate Zener voltage is 9% lower.; 1SMA5928BT3G: Candidate Zener voltage is 18% higher.
Power	1.0W	1.0W	1.0W	1.5W	1.0W / 1.5W — Power rating matches the target.; 1SMA4740A: Power rating matches the target.; 1SMA5928BT3G: Candidate has a higher power rating, which is a safe upgrade.
Manufacturer	GOODWORK	MDD(Microdiode Semiconductor)	-	onsemi	MDD(Microdiode Semiconductor) / onsemi — Cross-vendor alternative.; 1SMA5928BT3G: Cross-vendor alternative.

Application & sourcing insights

Questions & answers

1SMA4742A is a strong candidate in the same package and power rating, but has a slightly higher 12V Zener voltage. For applications tolerant of this change, it is a good option to evaluate.