Vishay General Semiconductor - Diodes Division SMA5J30AHM3_A/H

Overview

SMA5J30AHM3_A/H from Vishay General Semiconductor is a unidirectional 30 V standoff transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, rated for 500 W peak pulse power, 10.3 A peak pulse current at 48.4 V clamping, and 1.0 μA max reverse leakage at 30 V, used to protect MOSFETs and signal lines in automotive power electronics against inductive switching transients.

For engineers reviewing the SMA5J30AHM3_A/H datasheet, SMA5J30AHM3_A/H pinout, SMA5J30AHM3_A/H application, or SMA5J30AHM3_A/H equivalent, key selection criteria include clamping voltage under 48.4 V at 10.3 A, 30 V working voltage tolerance, AEC-Q101 qualification status, halogen-free RoHS compliance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.

Technical Context

This TVS diode operates as a unidirectional clamping device with a breakdown voltage range of 33.3–36.8 V at 1 mA test current, designed to conduct surge energy away from sensitive downstream components during transient events such as load dump or ESD. Its glass-passivated junction ensures stable performance across temperature and long-term reliability.

The SMA5J30AHM3_A/H features low incremental surge resistance and fast response time (<1 ns), enabling effective suppression of 10/1000 μs waveform transients while maintaining low thermal resistance (R_θJA = 80 °C/W). It is qualified to AEC-Q101 and rated for operation from −55 °C to +150 °C junction temperature.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMA5J30AHM3_A/H, SMA5J30AHE3_A/H offers identical clamping and thermal performance but lacks halogen-free compliance, while SMCJ30A-H delivers triple the surge power in a larger footprint-making SMA5J30AHM3_A/H optimal for AEC-Q101-compliant, space-limited automotive modules needing verified halogen-free materials.

Availability

SMA5J30AHM3_A/H is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, and telecom DC power interfaces requiring stable component supply, full traceability, and lifecycle continuity support.

Supply support for SMA5J30AHM3_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, and protection devices with emphasis on reliability, efficiency, and application-specific validation.

The SMA5J series was engineered for high-power-density transient suppression in automotive and industrial systems, balancing compact size, AEC-Q101 qualification, and precise clamping performance under real-world surge conditions.

FAQ

What is the clamping voltage of the SMA5J30AHM3_A/H under a 10/1000 μs surge?

The SMA5J30AHM3_A/H has a maximum clamping voltage (V_C) of 48.4 V at 10.3 A peak pulse current (I_PPM) under the standardized 10/1000 μs waveform. This value is measured per JEDEC standards and reflects the actual voltage imposed on protected circuitry during transient events. The SMA5J30AHM3_A/H maintains this clamping performance across its qualified temperature range and is validated for repeated surge exposure without parameter shift.

Is the SMA5J30AHM3_A/H qualified for automotive applications?

Yes, the SMA5J30AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88875. It undergoes stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification per automotive requirements. The SMA5J30AHM3_A/H is specifically intended for use in engine control units, body electronics, and ADAS power domains where reliability under harsh thermal and electrical conditions is mandatory.

What does the "HM3" suffix indicate in SMA5J30AHM3_A/H?

The "HM3" suffix in SMA5J30AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from "HE3" (RoHS-compliant, AEC-Q101, but not halogen-free) and "E3/M3" (commercial grade only). The "_A/H" portion specifies packaging: 7-inch tape-and-reel, 1800-unit quantity, with revision "A". This coding ensures traceability to material composition, reliability grade, and assembly compatibility.

How does the SMA5J30AHM3_A/H compare to bidirectional TVS diodes like SMA5J30CA?

The SMA5J30AHM3_A/H is unidirectional and intended for DC rail protection where polarity is fixed, offering lower leakage (1.0 μA vs. up to 2.0 μA for CA variants) and tighter V_BR tolerance. In contrast, SMA5J30CA provides symmetrical clamping for AC or floating signal lines but cannot be used in DC configurations without external biasing. The SMA5J30AHM3_A/H is not interchangeable with SMA5J30CA without circuit redesign due to polarity and leakage differences.

What is the thermal resistance of the SMA5J30AHM3_A/H, and how does it affect layout?

The SMA5J30AHM3_A/H has a typical junction-to-ambient thermal resistance (R_θJA) of 80 °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 500 W surge rating, PCB layout must provide adequate copper area and thermal vias. Reducing pad size increases R_θJA, lowering sustainable surge repetition rate. The SMA5J30AHM3_A/H datasheet specifies exact pad dimensions in inches/mm to ensure compliance with derating curves in Figure 2.