Is there a pin-compatible replacement for 1SMA5931BT3G?

Yes, other Zener diodes in the SMA (DO-214AC) package are pin-compatible. However, you must verify the Zener voltage (Vz) is 18V and the power rating is at least 1.5W for it to be a functional drop-in replacement.

What risks should I check before replacing 1SMA5931BT3G?

The main risks are electrical. Ensure the replacement's Zener voltage (Vz) matches the required 18V. Also, verify its power dissipation is at least 1.5W and its operating temperature range is suitable for your application. A different Vz will change the circuit's regulation point.

1SMA5931BT3G Alternatives, Datasheet & Cross Reference | onsemi

Reviewing alternatives for the onsemi 1SMA5931BT3G, an 18V 1.5W Zener diode in an SMA package. Key considerations for replacement are matching the Zener voltage, power rating, and package.

AI replacement insight

Electrical riskhigh

Using a substitute with a different Zener voltage will change the circuit's performance and may cause failure.

Package risklow

Candidates with the same SMA package should be physically compatible.

Can it be replaced directly?

No direct 1-to-1 replacement was found in this batch. Candidates like 1SMA5932BT3G are close in voltage (20V vs 18V) but require engineering review before use.

Best replacement path

Search for a Zener diode with Vz=18V, Pd>=1.5W in an SMA (DO-214AC) package from a reputable manufacturer.

Main risk

The primary risk is using a part with a different Zener voltage, which will alter the circuit's voltage regulation behavior.

Recommended alternatives

Form-fit compatible Zener diode from the same series, but with a higher 20V Zener voltage.

View details

Alternative comparison matrix

Feature / factor	1SMA5931BT3G	1SMA5932BT3G	1SMA5935BT3G	Compatibility / risk
Package	SMA (DO-214AC)	SMA (DO-214AC)	SMA (DO-214AC)	SMA (DO-214AC) — Package is form-fit compatible.; 1SMA5935BT3G: Package is form-fit compatible.
Power	1.5 W	1.5 W	1.5 W	1.5 W — Power rating matches the target.; 1SMA5935BT3G: Power rating matches the target.
Voltage	18.0 V	20.0 V	27.0 V	20.0 V / 27.0 V — Zener voltage is higher than target.; 1SMA5935BT3G: Zener voltage is significantly higher.
Manufacturer	onsemi	onsemi	onsemi	onsemi — Same manufacturer and product series.; 1SMA5935BT3G: Same manufacturer and product series.

Application & sourcing insights

Questions & answers

The best alternatives are Zener diodes with an 18V nominal voltage, 1.5W or higher power rating, and an SMA (DO-214AC) package. Parts from the same onsemi 1SMA59xx series, like 1SMA5932BT3G (20V), are form-fit compatible but require voltage tolerance checks.