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Best Alternatives to MMSZ4705T1G

Package: SOD-123onsemiDiodes - Zener - SinglePackage: Tape & Reel (TR); Cut Tape (CT); Digi-Reel®Voltage - Zener (Nom) (Vz): 18 VTolerance: ±5%Current - Reverse Leakage @ Vr: 50 nA @ 13.6 VVoltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA

MMSZ4705T1G is an 18V, 500mW Zener diode in a SOD-123 package from onsemi. While several alternatives exist, careful review of Zener voltage and test conditions is required for a successful replacement.

AI replacement insight

Electrical riskmedium

Candidates may have different Zener voltage or test conditions affecting impedance.

Package risklow

All viable candidates use the same SOD-123 package.

Sourcing riskmedium

Some alternatives are from different vendors or have unknown lifecycle status.

Can it be replaced directly?

LMSZ5248BT1G is the closest functional and physical match, but requires engineering validation due to different test current specifications in its datasheet.

Best replacement path

The most direct path is LMSZ5248BT1G, which matches key parameters. For more options, consider other parts in the onsemi MMSZ series, but be prepared to accept slight voltage variations (e.g., 20V).

Main risk

The primary risk is selecting a part with an incorrect Zener voltage, which will fail to regulate at the intended 18V.

Recommended alternatives

2
LMSZ5248BT1G package
LMSZ5248BT1G

LRC

Needs validationlow risk

A strong cross-vendor alternative with matching package, Zener voltage, and power rating.

View details

Alternative comparison matrix

Feature / factorMMSZ4705T1GLMSZ5248BT1GMMSZ5250BT1GAlt 3Compatibility / risk
PackageSOD-123SOD-123SOD-123SOD-123 — Same package ensures form-fit compatibility.; MMSZ5250BT1G: Same package ensures form-fit compatibility.
Voltage18.0 V18.0 V20.0 V18.0 V / 20.0 V — Nominal Zener voltage matches.; MMSZ5250BT1G: Zener voltage is 11% higher.
Power0.5 W0.5 W0.5 W0.5 W — Power dissipation rating matches.; MMSZ5250BT1G: Power dissipation rating matches.
Current50 µA7.0 mA-7.0 mA — Zener test current (Izt) is significantly different, may affect impedance.
LifecycleActive--- — Candidate lifecycle is not specified, check availability.
Manufactureronsemi-onsemionsemi — Same manufacturer, same product series.

Application & sourcing insights

Questions & answers

Verified drop-in options for MMSZ4705T1G 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.