Vishay General Semiconductor - Diodes Division SMB10J8.5AHE3/5B

Overview

SMB10J8.5AHE3/5B 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 a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V clamping voltage (VC) at 20 A peak pulse current (IPPM), and 1000 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial power supply inputs.

For engineers reviewing the SMB10J8.5AHE3/5B datasheet, SMB10J8.5AHE3/5B pinout, SMB10J8.5AHE3/5B application, or SMB10J8.5AHE3/5B equivalent, key selection criteria include clamping performance under 20 A surge, AEC-Q101 qualification for automotive use, unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.

Technical Context

This TVS diode operates as a shunt-clamping device that remains high-impedance below VWM (8.5 V) and rapidly transitions to low-impedance conduction above VBR to limit transient overvoltages. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and repeatable breakdown behavior across temperature (-55 °C to +150 °C).

The SMB10J8.5AHE3/5B delivers 1000 W peak pulse power handling per 10/1000 µs waveform when mounted on 0.2" × 0.2" copper pads, with thermal resistance RθJA = 72 °C/W and RθJL = 20 °C/W - enabling effective heat dissipation during transient events without requiring external heatsinking in typical PCB layouts.

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; polarity indicated by cathode band at one end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ8.5A-E3/52, the SMB10J8.5AHE3/5B adds AEC-Q101 qualification and extended reel quantity (3200 pcs), while versus SMCJ8.5AHE3/52 it trades 500 W extra surge capacity for 30% smaller PCB area and lower thermal mass - optimizing for space-constrained automotive modules.

Availability

SMB10J8.5AHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial power input protection, and telecom line interface circuits requiring stable component supply with AEC-Q101 assurance and SMT production scalability.

Supply support for SMB10J8.5AHE3/5B 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 optimization.

The SMB10J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density transient suppression in automotive, industrial, and communications systems where compact size and AEC-Q101 compliance are mandatory.

FAQ

What is the clamping voltage of SMB10J8.5AHE3/5B at its rated peak pulse current?

The SMB10J8.5AHE3/5B has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current (IPPM) of 20 A using the 10/1000 µs waveform. This value is measured under standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and ensures downstream components remain within safe operating voltage limits during surge events.

Is SMB10J8.5AHE3/5B qualified for automotive applications?

Yes, SMB10J8.5AHE3/5B is AEC-Q101 qualified, as confirmed by Vishay's documentation (Document Number: 88422, Revision: 09-Jan-2024). The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, making it suitable for use in automotive subsystems including engine control units, ADAS sensors, and body electronics where reliability under temperature cycling and vibration is critical.

What does the "5B" in SMB10J8.5AHE3/5B indicate?

The "5B" in SMB10J8.5AHE3/5B specifies the packaging configuration: 13-inch diameter plastic tape and reel containing 3200 units. This differs from "52", which denotes 7-inch reels with 750 units. Both share identical electrical and mechanical specifications; the suffix only reflects logistics and SMT line feed compatibility.

How does SMB10J8.5AHE3/5B differ from bidirectional variants like SMB8J8.5CA?

The SMB10J8.5AHE3/5B is unidirectional with cathode band marking and 1000 W PPPM, whereas SMB8J8.5CA is bidirectional (no polarity marking) with 800 W PPPM and 40 A IPPM. Unidirectional operation allows lower clamping voltage for DC-biased lines, while bidirectional types suit AC-coupled or symmetrical signal paths - the choice depends on circuit topology and surge polarity expectations.

What is the thermal resistance of SMB10J8.5AHE3/5B, and how does it affect layout design?

SMB10J8.5AHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W. These values assume mounting on 0.2" × 0.2" copper pads per terminal. To maintain TJ ≤ 150 °C during repeated surges, designers must ensure adequate copper area and avoid excessive trace length between the device and ground plane - especially critical in high-duty-cycle industrial applications.