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Best Alternatives to 1SMA4743A

Package: SMAGOODWORKDiodes - Zener - SingleNominal Zener Voltage: 13 VPower Dissipation: 1 WForward Voltage: 1.2 VZener Current (IZT): 19 mADynamic Impedance (ZZT): 10 Ohm

The 1SMA4743A is a 13V, 1W Zener diode in a common SMA package. When searching for alternatives, key considerations are matching the Zener voltage and ensuring the package is compatible.

AI replacement insight

Electrical risklow

Low if Zener voltage is matched. High otherwise.

Package risklow

SMA is a standard package with many compatible options.

Sourcing risklow

Multiple manufacturers produce similar 13V, 1W Zener diodes.

Can it be replaced directly?

Direct replacement for 1SMA4743A should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.

Best replacement path

The onsemi 1SMA5928BT3G is a strong candidate, offering the same 13V Zener voltage and package with a higher 1.5W power rating.

Main risk

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

Recommended alternatives

3
1SMA5928BT3G package
1SMA5928BT3G

onsemi

Needs validationlow risk

Excellent alternative with matching Zener voltage and package, plus a higher power rating for increased reliability.

View details

Alternative comparison matrix

Feature / factor1SMA4743A1SMA5928BT3G1SMA4742A1SMA5929BT3GCompatibility / risk
PackageSMASMA (DO-214AC)DO-214AC/SMASMA (DO-214AC)SMA (DO-214AC) / DO-214AC/SMA — Package matches, ensuring form and fit.; 1SMA4742A: Package matches, ensuring form and fit.; 1SMA5929BT3G: Package matches, ensuring form and fit.
Voltage13.0V13.0V12.0V15.0V13.0V / 12.0V / 15.0V — Zener voltage matches the target.; 1SMA4742A: Zener voltage is lower, will regulate at a different level.; 1SMA5929BT3G: Zener voltage is higher, will regulate at a different level.
Power1.0W1.5W1.0W1.5W1.5W / 1.0W — Higher power rating provides more thermal margin.; 1SMA4742A: Power rating is identical.; 1SMA5929BT3G: Higher power rating provides more thermal margin.
PinoutStandardUnknown--Unknown — Pinout assumed standard for SMA diode, but requires verification.

Application & sourcing insights

Questions & answers

Verified drop-in options for 1SMA4743A 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.