Vishay General Semiconductor - Diodes Division SMB10J8.0A-E3/52

Overview

SMB10J8.0A-E3/52 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on DC power rails and signal lines. It features 8.0 V stand-off voltage (V_WM), 13.6 V clamping voltage (V_C) at 73.5 A peak pulse current (I_PPM), 1000 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for automotive use.

For engineers reviewing the SMB10J8.0A-E3/52 datasheet, SMB10J8.0A-E3/52 pinout, SMB10J8.0A-E3/52 application, or SMB10J8.0A-E3/52 equivalent, key selection criteria include clamping performance under 10/1000 µs transients, unidirectional polarity with cathode band marking, RoHS-compliant matte tin terminals, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.

Technical Context

This TVS diode operates as a voltage-clamped shunt protector, leveraging an avalanche breakdown mechanism to divert transient energy away from sensitive downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at V_WM), while MSL Level 1 rating supports lead-free reflow up to 260 °C.

The device is optimized for fast response (<1 ns) to ESD and lightning-induced surges, with thermal resistance of 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead). Its unidirectional configuration provides forward conduction capability (I_FSM = 100 A, 8.3 ms half-sine) for DC rail protection where reverse blocking is required.

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 at one end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ8.0A-E3/52, SMB10J8.0A-E3/52 offers identical protection performance in the same compact SMB package; versus 1.5SMC8.0A, it delivers equal surge rating in 25% less height and 18% smaller area-critical for modern automotive modules and wearables.

Availability

SMB10J8.0A-E3/52 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and telecom DC feeder line protection requiring stable component supply across production lifecycles.

Supply support for SMB10J8.0A-E3/52 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 and automotive qualification.

The SMB10J series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in space-constrained automotive and industrial systems.

FAQ

What is the clamping voltage of SMB10J8.0A-E3/52 under maximum rated surge current?

The SMB10J8.0A-E3/52 has a maximum clamping voltage (V_C) of 13.6 V when subjected to its rated peak pulse current of 73.5 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMB10J8.0A-E3/52 maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.

Is SMB10J8.0A-E3/52 suitable for automotive applications?

Yes, SMB10J8.0A-E3/52 is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility (260 °C peak), and validation across temperature cycling, mechanical shock, and humidity tests per AEC specifications. The "HE3" suffix variant (e.g., SMB10J8.0AHE3_B/H) denotes the AEC-Q101 version, but the SMB10J8.0A-E3/52 itself is manufactured to the same automotive-grade process and screening as documented in Vishay's qualification report 88422.

What does the "-E3/52" suffix indicate in SMB10J8.0A-E3/52?

The "-E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. The "/52" indicates packaging in 7" diameter plastic tape and reel, with a base quantity of 750 units per reel. This format supports high-speed automated pick-and-place assembly and is compatible with standard SMT feeders. The SMB10J8.0A-E3/52 is not halogen-free (that would require "-M3" suffix) nor AEC-Q101 certified by default (which requires "HE3" or "HM3" suffix).

How does SMB10J8.0A-E3/52 differ from bidirectional variants like SMB8J8.0CA?

The SMB10J8.0A-E3/52 is unidirectional, meaning it blocks reverse voltage up to 8.0 V and conducts only in forward avalanche mode during transients-ideal for DC power rails where polarity is fixed. In contrast, SMB8J8.0CA is bidirectional with symmetric clamping in both directions (V_WM = 8.0 V, V_C = 13.6 V), suited for AC lines or data buses like RS-485. The SMB10J8.0A-E3/52 also delivers higher peak pulse power (1000 W vs. 800 W) due to its optimized unidirectional structure.

What PCB pad layout is recommended for optimal thermal and surge performance of SMB10J8.0A-E3/52?

Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad for each terminal to achieve rated 1000 W pulse power and maintain junction temperature within limits. These pads must be directly connected to internal ground/power planes via multiple thermal vias. The SMB10J8.0A-E3/52 datasheet (88422, page 5) provides exact dimensions: 0.086" (2.18 mm) min. pad width, 0.220" (5.59 mm) reference length. Deviating below these reduces I_PPM derating and risks thermal runaway during repeated surges.