Vishay General Semiconductor - Diodes Division SMA5J22AHM3_A/I

Overview

SMA5J22AHM3_A/I from Vishay General Semiconductor is a unidirectional 500 W Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, with 22 V stand-off voltage (V_WM), 24.4–26.9 V breakdown voltage (V_BR), and 14.1 A peak pulse current (I_PPM) at 35.5 V clamping voltage (V_C). It protects MOSFETs and sensor signal lines in automotive powertrain control modules against inductive switching transients.

For engineers reviewing the SMA5J22AHM3_A/I datasheet, SMA5J22AHM3_A/I pinout, SMA5J22AHM3_A/I application, or SMA5J22AHM3_A/I equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, thermal resistance (R_θJA = 80 °C/W), AEC-Q101 qualification status, and halogen-free RoHS compliance per ordering suffix HM3.

Technical Context

This device operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds V_BR (24.4–26.9 V), clamping transient energy within 1 ns response time. Its glass-passivated junction ensures stable leakage (<1.0 μA at V_WM) and low incremental surge resistance for repeatable protection performance.

Designed for surface-mount placement on 0.2" × 0.2" copper pads, it delivers 500 W peak pulse power (10/1000 μs waveform) with derating above 25 °C ambient, and supports operating junction temperatures up to +150 °C. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), surface-mount, unidirectional polarity indicated by cathode band. Matte tin-plated leads, MSL Level 1 (260 °C reflow peak), compliant with J-STD-002 and JESD 22-B102 solderability standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMA5J22AHE3_A/I, SMA5J22AHM3_A/I adds halogen-free assurance for strict environmental compliance; compared with SMA6J22A-M3/5A, it trades 100 W pulse power headroom for tighter cost and qualification alignment in standard AEC-Q101 automotive deployments.

Availability

SMA5J22AHM3_A/I is available at Aetrix Electronics and suitable for automotive powertrain control, industrial motor drives, and ADAS camera interface designs requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.

Supply support for SMA5J22AHM3_A/I 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 automotive-grade reliability and high-power density packaging.

The SMA5J series is designed specifically for high-energy transient suppression in harsh-environment applications, targeting automotive, industrial, and telecom systems where AEC-Q101 qualification and consistent clamping performance are mandatory.

FAQ

What is the clamping voltage of SMA5J22AHM3_A/I at its rated peak pulse current?

The SMA5J22AHM3_A/I has a maximum clamping voltage (V_C) of 35.5 V at its rated peak pulse current (I_PPM) of 14.1 A, measured under the standardized 10/1000 μs waveform. This value is critical for ensuring the protected downstream IC remains within its absolute maximum voltage rating during surge events. The SMA5J22AHM3_A/I achieves this clamping performance while maintaining low leakage and fast response.

Is SMA5J22AHM3_A/I qualified for automotive applications?

Yes, SMA5J22AHM3_A/I is AEC-Q101 qualified, as confirmed by the HM3 suffix in its ordering code. This qualification validates its reliability for automotive use, including extended temperature operation (-55 °C to +150 °C), mechanical robustness, and long-term stability under thermal cycling and humidity exposure. The SMA5J22AHM3_A/I is commonly deployed in engine control units and ADAS modules where such certification is mandatory.

What does the "HM3" suffix indicate in SMA5J22AHM3_A/I?

The "HM3" suffix in SMA5J22AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, not halogen-free). The HM3 designation ensures compliance with automotive green procurement policies and eliminates brominated flame retardants from the molding compound. SMA5J22AHM3_A/I meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards.

How does the thermal resistance of SMA5J22AHM3_A/I affect PCB layout?

The SMA5J22AHM3_A/I has a typical junction-to-ambient thermal resistance (R_θJA) of 80 °C/W when mounted on 0.2" × 0.2" copper pads. This value directly impacts minimum copper area requirements: reducing pad size increases R_θJA, risking thermal runaway during repeated surges. For reliable operation, maintain the recommended pad layout per Vishay's DO-214AC outline drawing. SMA5J22AHM3_A/I does not require additional heatsinking for single-event protection in most automotive applications.

Can SMA5J22AHM3_A/I be used in bidirectional configurations?

No, SMA5J22AHM3_A/I is a unidirectional TVS diode, as indicated by the "A" (not "CA") suffix and cathode band marking. Bidirectional operation requires the CA-suffixed variant (e.g., SMA5J22CA). Using SMA5J22AHM3_A/I in reverse-biased signal paths would result in forward conduction and failure. Always verify polarity alignment during placement-SMA5J22AHM3_A/I must be oriented with cathode toward the transient source.