Diodes Incorporated SMBJ8.0CA-13-F

Overview

SMBJ8.0CA-13-F from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in SMB package, designed for robust overvoltage protection of DC power rails and signal lines. It features 8.0 V reverse standoff voltage (VRWM), 8.89–10.23 V breakdown voltage (VBR) at 1.0 mA, 13.6 V maximum clamping voltage (VC) at 44.1 A peak pulse current (IPP), and 600 W peak pulse power dissipation - deployed in industrial motor drives to safeguard gate drivers against inductive switching transients.

For engineers reviewing the SMBJ8.0CA-13-F datasheet, SMBJ8.0CA-13-F pinout, SMBJ8.0CA-13-F application, or SMBJ8.0CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, unidirectional vs. bi-directional polarity requirements for AC-coupled or bidirectional data lines, thermal derating above +25°C, and compatibility with automated SMT placement on 0.8 mm pitch PCBs.

Technical Context

This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC signals, differential buses (e.g., RS-485), and floating power domains without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance and low leakage under repeated surge stress.

The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity standards when integrated with appropriate series impedance. Clamping performance is validated using the 10/1000 µs double-exponential waveform per REA, with thermal derating defined down to 4.8 W/°C above ambient.

Key Specifications

Pinout & Package

Two-terminal SMB package: Cathode band omitted (bi-directional); terminals are non-polarized anode/cathode pair. Standard SMB mechanical dimensions: length 4.06–4.57 mm, width 3.30–3.94 mm, height 1.96–2.21 mm, lead spacing 5.00–5.59 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ8.0CA-13-F, the unidirectional SMBJ8.0A-13-F offers identical clamping but requires polarity-aware layout, while the SMAJ8.0CA sacrifices 33% peak power and thermal robustness for smaller footprint - making the SMBJ variant optimal for industrial-grade surge immunity where reliability trumps size.

Availability

SMBJ8.0CA-13-F is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, RS-485 communication interfaces, and smart energy metering terminals requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for SMBJ8.0CA-13-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.

SMBJ series TVS diodes are engineered for high-reliability board-level ESD and surge protection in automotive, industrial, and communications infrastructure - emphasizing tight VBR tolerance, repeatable clamping, and AEC-Q200 readiness.

FAQ

What is the maximum clamping voltage of SMBJ8.0CA-13-F at its rated peak pulse current?

The maximum clamping voltage (VC) is 13.6 V at 44.1 A peak pulse current (IPP), measured under the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range (−55 °C to +150 °C) and defines the upper voltage limit imposed on protected circuitry during surge events.

Can SMBJ8.0CA-13-F be used in place of a unidirectional TVS like SMBJ8.0A-13-F?

Yes, but only if the protected circuit is inherently symmetrical or AC-coupled. The bi-directional SMBJ8.0CA-13-F clamps equally for both polarities, whereas the unidirectional version conducts only when cathode is more positive than anode. Substituting without verifying signal polarity may result in unintended conduction or failed protection.

Does SMBJ8.0CA-13-F meet AEC-Q200 stress test requirements for automotive use?

While not officially AEC-Q200 qualified, the SMBJ8.0CA-13-F shares construction, materials, and thermal performance with AEC-Q200–qualified variants in the same SMBJ family (e.g., SMBJ8.0CAQ-13-F). Its −55 °C to +150 °C operating range, glass passivation, and 600 W surge capability align with Grade 2 automotive requirements when validated in system-level testing.

How does the 50 µA maximum leakage current impact low-power sensor node designs?

At 50 µA maximum reverse leakage (IR) at 8.0 V VRWM, the SMBJ8.0CA-13-F adds negligible loading to battery-powered circuits - for example, contributing just 0.4 mW of standby power loss on a 8 V rail. This enables direct integration into always-on IoT sensors without compromising multi-year battery life.