Vishay General Semiconductor - Diodes Division SMAJ130AHM3/H

Overview

SMAJ130AHM3/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 130 V standoff voltage (V_WM), 144–159 V breakdown range (V_BR at 1 mA), 209 V clamping voltage (V_C) at 1.4 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), commonly deployed on power rails and I/O lines in industrial motor drives and automotive ECUs.

For engineers reviewing the SMAJ130AHM3/H datasheet, SMAJ130AHM3/H pinout, SMAJ130AHM3/H application, or SMAJ130AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and low incremental surge resistance enabling fast, repeatable clamping during ESD and load-dump transients.

Technical Context

This TVS diode operates as a unidirectional clamp-cathode-banded-triggering conduction when reverse voltage exceeds V_BR, diverting surge current to ground while limiting downstream voltage to ≤209 V. Its glass-passivated junction ensures stable leakage (<1.0 μA at V_WM) and long-term reliability under thermal cycling.

Designed for surface-mount automation, it mounts on 0.2" × 0.2" copper pads per JEDEC standard, with thermal resistance R_θJA = 120 °C/W and R_θJL = 30 °C/W. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade deployment.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), surface-mount, 2-terminal device with molded epoxy case meeting UL 94 V-0; cathode identified by a band on the body; terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ130AHM3/H, SMAJ130AHE3/H omits halogen-free and AEC-Q101 compliance-reducing cost but limiting automotive use-while SMBJ130A-HM3 trades compactness for higher surge capacity and thermal margin in space-tolerant designs.

Availability

SMAJ130AHM3/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor controllers, telecom power supplies, and consumer appliance control boards requiring stable component supply across multi-year production cycles.

Supply support for SMAJ130AHM3/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 validation.

The SMAJ series targets high-reliability transient suppression in harsh environments; engineered for fast response, low clamping, and automotive-grade qualification-especially where space-constrained SMD layouts demand DO-214AC compatibility.

FAQ

What is the clamping voltage of SMAJ130AHM3/H and how is it measured?

The clamping voltage (V_C) of SMAJ130AHM3/H is 209 V, measured at a peak pulse current (I_PPM) of 1.4 A using a standardized 10/1000 μs double-exponential waveform. This value reflects the maximum voltage seen across the device during full-rated surge conditions and is critical for ensuring protected circuitry remains below its absolute maximum ratings. The SMAJ130AHM3/H achieves this clamping performance while maintaining low incremental surge resistance, directly verified in Vishay's characterization data.

Is SMAJ130AHM3/H suitable for automotive applications?

Yes, SMAJ130AHM3/H is AEC-Q101 qualified and explicitly designated for automotive use-the "HM3" suffix confirms halogen-free, RoHS-compliant construction and qualification to the AEC-Q101 stress test standard. It is deployed in engine control units, body control modules, and ADAS sensor interfaces where sustained operation at 150 °C and immunity to load-dump transients are required. The SMAJ130AHM3/H meets these requirements without derating in typical under-hood thermal profiles.

What does the "HM3" suffix mean in SMAJ130AHM3/H?

The "HM3" suffix in SMAJ130AHM3/H indicates halogen-free, RoHS-compliant construction with full AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., "E3" or "M3") and confirms compliance with automotive environmental and reliability standards-including extended temperature operation, mechanical shock/vibration testing, and accelerated life validation. The SMAJ130AHM3/H is supplied on 7" tape-and-reel (package code H) and rated for MSL Level 1 handling.

How does SMAJ130AHM3/H compare to bidirectional TVS diodes like SMAJ130CA?

SMAJ130AHM3/H is unidirectional and intended for DC line protection with defined polarity (cathode to ground), whereas SMAJ130CA is bidirectional and used on AC or floating signal lines. The SMAJ130AHM3/H offers lower leakage (<1.0 μA at 130 V) and supports forward conduction for certain biasing schemes, while SMAJ130CA exhibits symmetrical clamping in both directions but higher reverse leakage at V_WM. Selection depends on circuit topology-not interchangeability.

What is the thermal resistance and mounting requirement for SMAJ130AHM3/H?

SMAJ130AHM3/H has a typical junction-to-ambient thermal resistance (R_θJA) of 120 °C/W and junction-to-lead (R_θJL) of 30 °C/W, measured on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per JEDEC standard. To maintain rated power dissipation and avoid thermal runaway, PCB layout must replicate this pad area for each terminal. The SMAJ130AHM3/H is rated for MSL Level 1 and withstands peak reflow temperatures up to 260 °C without preconditioning.