Vishay General Semiconductor - Diodes Division SMB10J18AHE3_A/H

Overview

SMB10J18AHE3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on power and signal lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 1000 W peak pulse power (10/1000 µs), 34.2 A peak pulse current (IPPM), and clamps transients to ≤29.2 V at rated surge - used in automotive ECUs, industrial sensor interfaces, and DC power rails.

For engineers reviewing the SMB10J18AHE3_A/H datasheet, SMB10J18AHE3_A/H pinout, SMB10J18AHE3_A/H application, or SMB10J18AHE3_A/H equivalent, key selection criteria include AEC-Q101 qualification, unidirectional polarity with cathode band marking, low clamping voltage under 30 V, 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 that enters avalanche conduction when reverse voltage exceeds its breakdown threshold (VBR = 20.0–22.1 V at IT = 1.0 mA). Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM = 18 V) and fast response time (<1 ns), enabling protection against ESD, lightning-induced surges, and inductive switching transients.

Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, with maximum junction temperature of +150 °C. It meets MSL Level 1 per J-STD-020 (peak reflow 260 °C) and is qualified to AEC-Q101 for automotive underhood applications.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by color band on one end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMB10J18AHE3_A/H, SMBJ18AHE3_A/H offers identical protection performance and automotive qualification in the same SMB footprint, while 1.5SMC18AH trades compactness for slightly better thermal derating at the cost of increased board area and rework complexity.

Availability

SMB10J18AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and DC power supply designs requiring stable component supply with AEC-Q101 assurance, RoHS compliance, and high-reliability surge immunity.

Supply support for SMB10J18AHE3_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, automotive qualification, and high-power density packaging.

The SMB10J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust transient suppression in harsh environments - especially automotive, industrial, and telecom infrastructure where repeatable clamping and AEC-Q101 validation are mandatory.

FAQ

What is the clamping voltage of SMB10J18AHE3_A/H at its rated peak pulse current?

The SMB10J18AHE3_A/H clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 34.2 A (10/1000 µs waveform). This value is measured under standard test conditions with 0.2" × 0.2" copper pads per terminal and directly determines the maximum overvoltage seen by downstream components during surge events. The SMB10J18AHE3_A/H maintains this clamping performance across its qualified operating temperature range.

Is SMB10J18AHE3_A/H suitable for automotive applications?

Yes, SMB10J18AHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant and AEC-Q101 qualified construction. It supports underhood and body-control module applications, having passed temperature cycling, mechanical shock, and humidity testing per the AEC standard. The SMB10J18AHE3_A/H also meets MSL Level 1 for reflow compatibility in automotive PCB assembly.

How does the SMB10J18AHE3_A/H differ from bidirectional variants like SMB8J18CA?

The SMB10J18AHE3_A/H is unidirectional with cathode marking and conducts only in reverse avalanche mode, while SMB8J18CA is bidirectional and symmetrical - offering protection for AC-coupled or differential lines. SMB10J18AHE3_A/H has higher peak pulse power (1000 W vs. 800 W) and lower clamping voltage (29.2 V vs. 29.2 V same, but at different IPPM), making it preferred for DC rail protection. SMB10J18AHE3_A/H cannot replace SMB8J18CA in true bidirectional signal paths without circuit redesign.

What is the maximum reverse leakage current for SMB10J18AHE3_A/H at its stand-off voltage?

The SMB10J18AHE3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at its stand-off voltage (VWM) of 18 V and ambient temperature of 25 °C. This ultra-low leakage ensures minimal power drain in always-on automotive subsystems and preserves battery life in sleep-mode applications. Leakage remains within specification up to TJ = 150 °C, verified per Vishay's thermal characterization data.

Can SMB10J18AHE3_A/H be used in place of SMBJ18AHE3_A/H?

Yes, SMB10J18AHE3_A/H and SMBJ18AHE3_A/H share identical electrical specifications (VWM = 18 V, VBR = 20.0–22.1 V, PPPM = 1000 W), package (SMB/DO-214AA), and qualification (AEC-Q101, RoHS). They originate from the same Vishay die family and differ only in part numbering convention and traceability coding. The SMB10J18AHE3_A/H functions as a direct functional and mechanical replacement for SMBJ18AHE3_A/H in all design contexts.