Vishay General Semiconductor - Diodes Division SMA5J26AHM3_A/H

Overview

SMA5J26AHM3_A/H from Vishay General Semiconductor is a unidirectional 500 W transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, with 26 V stand-off voltage (VWM), 28.9–31.9 V breakdown voltage (VBR), and 42.1 V clamping voltage (VC) at 11.9 A peak pulse current (IPPM). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial power electronics.

For engineers reviewing the SMA5J26AHM3_A/H datasheet, SMA5J26AHM3_A/H pinout, SMA5J26AHM3_A/H application, or SMA5J26AHM3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HM3 suffix), 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.

Technical Context

This TVS diode operates as a clamping device triggered by overvoltage events exceeding its 26 V reverse stand-off threshold. Its glass-passivated junction enables fast response (<1 ns) and stable breakdown behavior under repetitive 10/1000 μs surge waveforms.

Designed for surface-mount use in high-density PCB layouts, it delivers 500 W peak pulse power dissipation with thermal resistance of 80 °C/W (junction-to-ambient) and 25 °C/W (junction-to-lead), requiring minimal copper area while maintaining operation from –55 °C to +150 °C.

Key Specifications

Pinout & Package

Two-terminal SMA (DO-214AC) package: anode and cathode leads formed in gull-wing configuration. Cathode identified by molded band. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal for rated power handling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMA5J26AHM3_A/H, the HE3 variant trades halogen-free construction and AEC-Q101 validation for lower unit cost, while the SMC5J26AHE3_A/H offers superior thermal derating at the expense of footprint size-making SMA5J26AHM3_A/H optimal for space-constrained, automotive-qualified 24 V systems.

Availability

SMA5J26AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor drives, telecom power feeding circuits, and consumer appliance inverters requiring stable component supply with full traceability and lifecycle management.

Supply support for SMA5J26AHM3_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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.

The SMA5J series is designed for high-power-density transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where compact size, AEC-Q101 compliance, and repeatable clamping performance are essential.

FAQ

What is the maximum clamping voltage of the SMA5J26AHM3_A/H under a 10/1000 μs surge?

The SMA5J26AHM3_A/H has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current (IPPM) of 11.9 A using a 10/1000 μs waveform. This value is measured at TA = 25 °C on specified 5.0 mm × 5.0 mm copper pads and defines the upper voltage limit imposed on protected circuitry during transient events. The SMA5J26AHM3_A/H maintains this clamping performance across its operational temperature range.

Is the SMA5J26AHM3_A/H qualified for automotive applications?

Yes, the SMA5J26AHM3_A/H is AEC-Q101 qualified, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It undergoes stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification per AEC-Q101 standards. The SMA5J26AHM3_A/H is intended for use in engine control, body electronics, and ADAS subsystems where reliability under thermal and mechanical stress is mandatory.

What does the "_A/H" suffix mean in SMA5J26AHM3_A/H?

The "_A/H" suffix in SMA5J26AHM3_A/H specifies packaging and revision coding: "A" denotes the revision level of the device specification, and "H" indicates the preferred package code for 7-inch diameter plastic tape and reel, with a base quantity of 1800 units. This ordering code ensures consistent reel configuration and traceability for automated assembly. The SMA5J26AHM3_A/H is supplied in this format unless alternate delivery modes are requested.

Can the SMA5J26AHM3_A/H be used in bidirectional configurations?

No, the SMA5J26AHM3_A/H is a unidirectional TVS diode, as confirmed by its part number ending in "A" (not "CA") and its cathode band marking. Bidirectional operation requires the CA suffix (e.g., SMA5J26CA), which exhibits symmetrical clamping in both polarities. Using SMA5J26AHM3_A/H in reverse-biased configurations beyond its 26 V stand-off voltage will cause conduction and potential failure. Always verify polarity during PCB layout for the SMA5J26AHM3_A/H.

What is the thermal resistance of the SMA5J26AHM3_A/H, and how does it affect layout design?

The SMA5J26AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W and junction-to-lead resistance (RθJL) of 25 °C/W, measured on 0.2" × 0.2" copper pads. These values require adherence to the recommended pad layout to achieve rated 500 W pulse power. Reducing copper area increases RθJA, causing higher junction temperatures and possible derating; the SMA5J26AHM3_A/H must be mounted per Vishay's DO-214AC footprint guidelines to maintain performance and reliability.