Vishay General Semiconductor - Diodes Division SMBJ45AHE3_A/H

Overview

SMBJ45AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 8.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and automotive ECUs.

For engineers reviewing the SMBJ45AHE3_A/H datasheet, SMBJ45AHE3_A/H pinout, SMBJ45AHE3_A/H application, or SMBJ45AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and compliance with UL 497B surge protector classification.

Technical Context

This TVS diode operates as a voltage-clamping protection device triggered by reverse-biased avalanche breakdown. Its glass-passivated junction ensures stable leakage performance (<1.0 µA at VWM), while low incremental surge resistance enables effective energy diversion during ESD or lightning-induced surges.

The SMBJ45AHE3_A/H is rated for 600 W peak pulse power under 10/1000 µs waveform with 0.01% duty cycle, and supports repetitive surge events when thermally managed. Its 100 A IFSM rating (8.3 ms half-sine) confirms robustness against inrush currents in DC power rail protection applications.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking; anode is unmarked end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ45AHE3_A/H, the HM3 variant adds halogen-free compliance without altering protection performance, while the E3/52 version removes automotive qualification - enabling trade-offs between reliability assurance, regulatory compliance, and unit cost in volume production.

Availability

SMBJ45AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor nodes, telecom line cards, and consumer power adapter applications requiring stable component supply and AEC-Q101 traceability.

Supply support for SMBJ45AHE3_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, power efficiency, and automotive-grade qualification.

The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising signal fidelity or thermal margin.

FAQ

What is the clamping voltage of SMBJ45AHE3_A/H at its rated peak pulse current?

The SMBJ45AHE3_A/H has a maximum clamping voltage (VC) of 72.7 V when subjected to its specified peak pulse current of 8.3 A using the 10/1000 µs waveform. This value is measured under standardized test conditions and represents the upper limit of voltage imposed on the protected circuit during a surge event. The SMBJ45AHE3_A/H maintains this clamping performance across its qualified operating temperature range.

Is SMBJ45AHE3_A/H qualified for automotive applications?

Yes, SMBJ45AHE3_A/H is AEC-Q101 qualified, confirming its suitability for automotive applications such as engine control units, body electronics, and ADAS sensor modules. This qualification includes rigorous testing for temperature cycling, humidity bias, mechanical shock, and accelerated life stress. The "HE3" suffix explicitly denotes AEC-Q101 compliance, distinguishing it from commercial-grade variants like SMBJ45A-E3/52.

What is the maximum reverse leakage current for SMBJ45AHE3_A/H at its stand-off voltage?

The SMBJ45AHE3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 45 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage ensures minimal impact on standby power consumption in battery-operated or energy-sensitive systems. Leakage remains within specification across the full operating temperature range of –55 to +150 °C.

How does the thermal resistance of SMBJ45AHE3_A/H affect PCB layout?

The SMBJ45AHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To sustain repeated surge events or elevated ambient temperatures, designers must allocate adequate copper area and consider thermal vias. Failure to meet pad layout guidelines may cause junction temperature to exceed 150 °C, degrading long-term reliability of the SMBJ45AHE3_A/H.

What packaging and reel options are available for SMBJ45AHE3_A/H?

SMBJ45AHE3_A/H is supplied in 7" diameter plastic tape and reel format with a base quantity of 750 units per reel, using package code "H". This configuration supports automated SMT placement and is compatible with standard pick-and-place equipment. The "A/H" suffix indicates both the revision code (A) and delivery mode (7" reel). Alternative formats include 13" reels (code "I") for high-volume production runs.