MMBZ18VALT1G

Overview

The MMBZ18VALT1G is a dual common anode Zener transient voltage suppressor manufactured by onsemi. It operates within the MMBZ A-Series and is housed in a compact SOT-23-3 (SC-59-3) surface-mount package. The device features a nominal Zener voltage of 18 V with a tolerance of ±2%. It supports a peak pulse power dissipation of 40 W at 1.0 ms and withstands a maximum reverse working voltage of 15.3 V. The component is qualified to AEC-Q101 standards for automotive applications, ensuring reliability under harsh conditions.

Feature Summary

• Dual junction common anode configuration enables protection of two separate signal lines using a single three-terminal package.
• High thermal robustness with a maximum junction temperature rating of +175°C for mission-critical environments.
• AEC-Q101 qualification ensures compliance with automotive industry requirements for quality and reliability.
• Compact SOT-23-3 footprint optimizes board space for high-density electronic assemblies.

Applications

• Transient overvoltage and ESD protection in automotive engine control units.
• ESD suppression for automotive transmission control units.
• Voltage regulation in cellular phones and handheld portable devices.
• Protection circuits on high-density printed circuit boards.

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and qualification level. Ensure the ordering code matches the required AEC-Q101 automotive grade if intended for vehicle electronics. Confirm RoHS and halogen-free status through manufacturer documentation before finalizing procurement specifications.

Selection Notes

Select this component when dual-line ESD protection is required in a minimal footprint. The 18 V breakdown voltage suits applications requiring clamping near standard logic or sensor supply rails. Verify that the 40 W peak pulse capability meets the expected transient energy levels in the target circuit design.

Part Context

This part belongs to the MMBZ A-Series of dual common anode Zener diodes from onsemi. The series provides integrated ESD and transient protection solutions designed specifically for space-constrained consumer and automotive electronics. It serves as a consolidated alternative to discrete diode arrangements.

Replacement Considerations

Direct functional substitutes include other parts within the MMBZ A-Series offering similar 18 V ratings and SOT-23 packaging. Verify pinout compatibility and electrical parameters such as clamp voltage and peak pulse power before substitution.