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Best Alternatives to 3SMB5919B

Package: SMB (DO-214AA)Luguang Electronic Technology Co., Ltd.DiodesZener Voltage (Nom): 5.6 VPower Dissipation: 3 WZener Impedance (Zzt): 2 ΩReverse Leakage Current (Ir): 5 µA @ 3 VMaximum Forward Voltage: 1.5 V @ 200 mA

The 3SMB5919B is a 3W, 5.6V Zener diode in a standard SMB package, used for voltage regulation and transient protection. Finding a suitable replacement requires matching the Zener voltage, power rating, and package.

AI replacement insight

Electrical riskmedium

Zener voltage and power rating must be strictly matched to avoid circuit failure.

Package risklow

SMB (DO-214AA) is a widely used, standardized package, ensuring physical compatibility.

Can it be replaced directly?

Direct replacement for 3SMB5919B should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

The most direct replacement path is to select a part with the same 5.6V Zener voltage, 3W or higher power rating, and SMB package, such as 1SMB5919BT3G.

Main risk

The main risk is using a part with a different Zener voltage or a lower power rating, which can lead to circuit malfunction or component failure.

Recommended alternatives

3
1SMB5919BT3G package
1SMB5919BT3G

FUXINSEMI

Needs validationlow risk

Strong alternative with matching Zener voltage (5.6V), power (3W), and SMB package.

View details

Alternative comparison matrix

Feature / factor3SMB5919B1SMB5919BT3G1SMB5920BT3G1SMB5919BCompatibility / risk
PackageSMB (DO-214AA)SMB (DO-214AA)SMB (DO-214AA)SMB (DO-214AA)SMB (DO-214AA) — Same form factor.; 1SMB5920BT3G: Same form factor.; 1SMB5919B: Same form factor.
Voltage5.6V5.6V6.2V5.6V5.6V / 6.2V — Zener voltage matches.; 1SMB5920BT3G: Higher Zener voltage.; 1SMB5919B: Zener voltage matches.
Power3W3W3W1.5W3W / 1.5W — Power rating matches.; 1SMB5920BT3G: Power rating matches.; 1SMB5919B: Lower power rating.
Impedance2Ω2Ω--2Ω — Zener impedance matches.
Current5µA @ 3V5µA @ 3V--5µA @ 3V — Reverse leakage current matches.

Application & sourcing insights

Questions & answers

Verified drop-in options for 3SMB5919B are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.