Vishay General Semiconductor - Diodes Division SMB10J18AHM3_A/H

Overview

SMB10J18AHM3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on DC power rails and signal lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 1000 W peak pulse power (10/1000 µs), 34.2 A peak pulse current (IPPM), and clamps transients to ≤29.2 V at rated surge. Used in automotive ECUs and industrial sensor interfaces where AEC-Q101 qualification and low clamping voltage are critical.

For engineers reviewing the SMB10J18AHM3_A/H datasheet, SMB10J18AHM3_A/H pinout, SMB10J18AHM3_A/H application, or SMB10J18AHM3_A/H equivalent, key selection criteria include verified AEC-Q101 qualification, unidirectional polarity with cathode band marking, 1000 W surge rating at 25 °C, thermal resistance (RθJA = 72 °C/W), and halogen-free RoHS compliance per HM3 suffix.

Technical Context

This TVS diode operates as a clamping device across protected lines, entering avalanche conduction when reverse voltage exceeds VBR (20.0–22.1 V). Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at 18 V), while the SMB package supports automated SMT placement and meets MSL level 1 (260 °C reflow peak).

It delivers 1000 W peak pulse power under 10/1000 µs waveform with clamping voltage ≤29.2 V at 34.2 A IPPM, enabling robust protection against ISO 7637-2 Load Dump and IEC 61000-4-5 surges. Junction temperature range is -55 °C to +150 °C, and it is qualified to AEC-Q101 for automotive under-hood applications.

Key Specifications

Pinout & Package

Two-terminal unidirectional TVS diode in SMB (DO-214AA) package. Cathode identified by black band on body; anode is unmarked end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Compared with SMBJ18AHE3_A/H and SAC18, SMB10J18AHM3_A/H uniquely combines AEC-Q101 qualification, halogen-free construction, and full 1000 W surge capability in SMB package-making it the only option qualified for under-hood automotive deployment with strict material compliance.

Availability

SMB10J18AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with AEC-Q101 validation and halogen-free compliance.

Supply support for SMB10J18AHM3_A/H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.

The SMB10J series targets high-power transient suppression in harsh environments, engineered specifically for automotive and industrial applications demanding AEC-Q101 qualification, high surge robustness, and consistent clamping behavior.

FAQ

What is the clamping voltage of SMB10J18AHM3_A/H at its rated peak pulse current?

The SMB10J18AHM3_A/H clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 34.2 A (10/1000 µs waveform). This value is measured under standardized test conditions per ANSI/IEEE C62.35 and ensures downstream components see limited overvoltage stress. The SMB10J18AHM3_A/H achieves this with low incremental surge resistance, directly supporting robust protection of 12 V and 24 V system rails.

Is SMB10J18AHM3_A/H qualified for automotive applications?

Yes, SMB10J18AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's official documentation and ordering code suffix "HM3_X". This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and mechanical shock-validating its suitability for under-hood automotive electronics such as body control modules and ADAS camera power supplies. The SMB10J18AHM3_A/H meets all requirements for automotive-grade transient suppression.

What does the "HM3" suffix indicate in SMB10J18AHM3_A/H?

"HM3" denotes halogen-free, RoHS-compliant construction per Vishay's material categorization standard. Unlike E3-suffix parts, HM3 devices contain no brominated or chlorinated flame retardants and meet JEDEC JESD201 Class 2 whisker resistance. This makes SMB10J18AHM3_A/H compliant with stringent automotive and industrial environmental mandates. The "_A/H" further specifies tape-and-reel packaging (7" reel, 750 units) and revision level A.

How does SMB10J18AHM3_A/H differ from bidirectional TVS diodes like SMB8J18CA?

SMB10J18AHM3_A/H is unidirectional with cathode band marking and optimized for DC rail protection, offering 1000 W PPPM. In contrast, SMB8J18CA is bidirectional (no polarity marking), rated for 800 W PPPM, and intended for AC or dual-polarity signal line protection. The SMB10J18AHM3_A/H's higher power rating, AEC-Q101 qualification, and halogen-free HM3 construction make it unsuitable as a drop-in replacement for SMB8J18CA in AC-coupled applications.

What is the thermal resistance of SMB10J18AHM3_A/H, and how does it affect layout?

SMB10J18AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe operation at full 1000 W surge rating, PCB layout must provide adequate copper area and avoid thermal bottlenecks. Reducing pad size increases RθJA, derating surge capability-so the SMB10J18AHM3_A/H must be placed per Vishay's recommended mounting footprint to ensure reliability.