Vishay General Semiconductor - Diodes Division SMAJ5.0AHM3_A/H

Overview

SMAJ5.0AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for primary overvoltage protection of sensitive electronics. It features a 5.0 V stand-off voltage (VWM), 6.40–7.07 V breakdown voltage (VBR) at 10 mA test current, 400 W peak pulse power (10/1000 μs), and clamps transients to ≤9.2 V at 43.5 A peak surge current - deployed on power rails and I/O lines of automotive ECUs and industrial sensor interfaces.

For engineers reviewing the SMAJ5.0AHM3_A/H datasheet, SMAJ5.0AHM3_A/H pinout, SMAJ5.0AHM3_A/H application, or SMAJ5.0AHM3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and thermal resistance (RθJA = 120 °C/W) for board-level thermal design validation.

Technical Context

This TVS diode operates as a clamping device in reverse-biased configuration, leveraging an avalanche junction to divert transient energy above VWM while maintaining low leakage (<800 μA at 5.0 V). Its glass-passivated chip junction ensures stable breakdown characteristics and fast response time (<1.0 ns), critical for suppressing ESD and inductive switching spikes.

The SMAJ5.0AHM3_A/H is rated for -55 °C to +150 °C operating junction temperature, with 40 A non-repetitive forward surge capability (8.3 ms half-sine) and 3.3 W steady-state power dissipation on infinite heatsink at 50 °C ambient - enabling use in high-reliability automotive and industrial environments where thermal derating and long-term stability are mandatory.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow), matte tin-plated leads solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ5.0AHM3_A/H, the HE3 variant omits AEC-Q101 validation and may lack traceability documentation for automotive PPAP, while the M3/61 version shares halogen-free compliance but lacks automotive qualification and uses a legacy ordering suffix - making SMAJ5.0AHM3_A/H the only option fully aligned with Tier-1 automotive supply chain requirements.

Availability

SMAJ5.0AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor modules, and telecom power input stages requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.

Supply support for SMAJ5.0AHM3_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, efficiency, and application-specific performance.

The SMAJ series is engineered for high-energy transient suppression in automotive, industrial, and communications systems - delivering consistent clamping behavior, low leakage, and robust surge endurance in compact surface-mount packages.

FAQ

What does the 'HM3' suffix indicate in SMAJ5.0AHM3_A/H?

The 'HM3' suffix in SMAJ5.0AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The 'H' identifies the AEC-Q101 grade, 'M3' specifies halogen-free material content, and '_A/H' indicates the revision level and 7-inch tape-and-reel packaging format (1800 pieces per reel). This distinguishes it from commercial variants like SMAJ5.0A-E3 or SMAJ5.0A-M3 that lack automotive qualification.

Is SMAJ5.0AHM3_A/H bidirectional or unidirectional?

SMAJ5.0AHM3_A/H is a unidirectional transient voltage suppressor. Its polarity is marked by a cathode band on the SMA package body, and it conducts only in reverse bias above VBR. Bidirectional versions carry a 'CA' suffix (e.g., SMAJ5.0CA); this part is explicitly designated 'A', confirming unidirectional functionality per Vishay's ordering table and electrical characteristics table.

What is the maximum clamping voltage for SMAJ5.0AHM3_A/H under surge conditions?

The maximum clamping voltage (VC) for SMAJ5.0AHM3_A/H is 9.2 V at 43.5 A peak pulse current (IPPM), measured with a 10/1000 μs waveform per JEDEC standards. This value is guaranteed across the full operating temperature range and represents the upper limit of voltage imposed on protected circuitry during a 400 W transient event - critical for ensuring downstream ICs remain within absolute maximum ratings.

Does SMAJ5.0AHM3_A/H meet automotive qualification standards?

Yes, SMAJ5.0AHM3_A/H is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 09-Jan-2024 (Document Number: 88390), under the "Mechanical Data" section and ordering information table. This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD, making it suitable for automotive powertrain, body electronics, and ADAS applications requiring zero-defect reliability.

What is the thermal resistance and how does it affect PCB layout for SMAJ5.0AHM3_A/H?

SMAJ5.0AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value directly impacts PCB copper area design: reducing RθJA requires larger thermal pads or internal planes. For sustained 3.3 W dissipation, ambient temperature must be limited to ≤50 °C unless additional copper or airflow is provided - underscoring the need for validated thermal layout per Vishay's recommended pad dimensions.