Is there a pin-compatible replacement for BZX84C18LT1G?

Yes, MMBZ5248BQ-7-F is a likely pin-compatible replacement. Both use the standard SOT-23 package for Zener diodes. However, always verify the pinout (Anode, Cathode) from the datasheets before board layout.

What risks should I check before replacing BZX84C18LT1G?

Key risks include: 1) Zener voltage mismatch, which alters the regulation point. 2) Lower power rating, which can lead to overheating. 3) Different dynamic impedance (Zzt), which can affect regulation stability. 4) Package or pinout differences.

BZX84C18LT1G Alternatives, Datasheet & Cross Reference | onsemi

BZX84C18LT1G is a popular 18V, 250mW Zener diode in a SOT-23 package from onsemi. When seeking alternatives, focus on matching the Zener voltage, package, and ensuring power dissipation meets or exceeds the original.

AI replacement insight

Electrical risklow

Key electricals like Vz and tolerance are well-matched by top candidates.

Package risklow

SOT-23 is a highly standardized package, making physical replacement straightforward.

Can it be replaced directly?

Yes, MMBZ5248BQ-7-F is a strong candidate for a direct replacement, sharing the same 18V Zener voltage, SOT-23 package, and tolerance.

Best replacement path

MMBZ5248BQ-7-F from Diodes Inc. is the best path, offering identical key parameters with a higher power rating and AEC-Q qualification.

Main risk

The main risk when substituting Zener diodes is a mismatch in Zener voltage (Vz) or dynamic impedance, which can affect regulation performance.

Recommended alternatives

Strong SOT-23 Zener diode alternative with matching 18V rating, higher power handling, and AEC-Q qualification.

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Alternative comparison matrix

Feature / factor	BZX84C18LT1G	MMBZ5248BQ-7-F	BZX84B18_R1_00001	Compatibility / risk
Package	SOT-23	SOT-23	SOT-23	SOT-23 — Package matches, pinout is standard for this type.; BZX84B18_R1_00001: Package matches.
Voltage	18 V	18 V	18 V	18 V — Zener voltage matches.; BZX84B18_R1_00001: Zener voltage matches.
Power	250 mW	350 mW	410 mW	350 mW / 410 mW — Higher power rating provides more thermal margin.; BZX84B18_R1_00001: Higher power rating provides more thermal margin.
Tolerance	Standard (±5%)	±5%	±2%	±5% / ±2% — Voltage tolerance matches.; BZX84B18_R1_00001: Tighter voltage tolerance is an upgrade.
Temperature	-65°C to +150°C	-65°C to +150°C	-55°C to +150°C	-65°C to +150°C / -55°C to +150°C — Operating temperature range matches.; BZX84B18_R1_00001: Low end of temp range is higher (-55°C vs -65°C).

Application & sourcing insights

Questions & answers

MMBZ5248BQ-7-F by Diodes Inc. is an excellent alternative. It matches the 18V Zener voltage and SOT-23 package, while offering a higher power rating of 350mW and AEC-Q automotive qualification.