Diodes Incorporated SMBJ13CA-13-F

Overview

SMBJ13CA-13-F from Diodes Incorporated is a bi-directional 600W transient voltage suppressor (TVS) diode in SMB package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 13.0V reverse standoff voltage (VRWM), 14.4V minimum breakdown voltage (VBR), 21.5V maximum clamping voltage (VC) at 27.9A peak pulse current (IPP), and operates across –55°C to +150°C. Used in industrial power supplies and automotive body control modules to absorb ESD and lightning-induced surges.

For engineers reviewing the SMBJ13CA-13-F datasheet, SMBJ13CA-13-F pinout, SMBJ13CA-13-F application, or SMBJ13CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, unidirectional vs. bi-directional polarity requirements for AC-coupled or bidirectional data lines, thermal derating above +25°C, and compatibility with IPC-7351B SMB footprint land patterns.

Technical Context

This bi-directional TVS diode functions as a voltage-clamped shunt protector: under normal operation it presents <5µA leakage at 13.0V; during transients exceeding 14.4V, it avalanches to clamp voltage at ≤21.5V while diverting up to 27.9A (8.3ms half-sine). Its glass-passivated die ensures stable breakdown characteristics and low capacitance (<100pF at 1MHz).

Designed for surface-mount assembly on PCBs with limited thermal mass, it relies on ambient convection and copper pour for heat dissipation - steady-state power rating drops from 5.0W at TL=+75°C to zero at +150°C per Fig. 6, and pulse power derates linearly at 4.8W/°C above +25°C.

Key Specifications

Pinout & Package

Two-terminal SMB (DO-214AA) package with no polarity marking for bi-directional operation; terminals are symmetrical and interchangeable. Cathode band is absent - unlike unidirectional variants - confirming true bi-directional conduction path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ13CA-13-F, the ON Semiconductor variant offers drop-in replacement capability with identical form-fit-function, while the Littelfuse 1.5SMC13CA trades compactness for higher pulse energy headroom and requires PCB redesign - making the Diodes part optimal for space-constrained, high-volume industrial designs.

Availability

SMBJ13CA-13-F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and telecom power feeds requiring stable component supply, full traceability, and consistent RoHS/halogen-free compliance.

Supply support for SMBJ13CA-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, manufacturing, and sales operations across Asia, Europe, and the Americas.

This SMBJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability overvoltage protection in automotive, industrial, and communications infrastructure where robustness, consistency, and regulatory compliance are mandatory.

FAQ

What is the meaning of the "C" in SMBJ13CA?

The "C" suffix denotes bi-directional construction, meaning the device provides symmetrical clamping for both positive and negative transients. Unlike unidirectional SMBJ13A (which has a cathode band and conducts only in reverse bias), SMBJ13CA has no polarity marking and functions identically in either direction - essential for protecting AC-coupled or bidirectional signal lines like LIN or RS-485.

Can SMBJ13CA-13-F be used in place of a unidirectional TVS?

No - SMBJ13CA-13-F must not replace a unidirectional TVS in DC-biased circuits such as 12V power rails with ground reference, because its bi-directional nature allows forward conduction below ~0.7V, potentially causing short-circuit behavior. Unidirectional versions (e.g., SMBJ13A-13-F) are required where only reverse-polarity surge protection is needed and forward conduction must be blocked.

How does the SMB package affect thermal performance?

The SMB (DO-214AA) package has limited thermal mass and surface area, resulting in a steady-state power dissipation of only 5.0W at TL = +75°C and zero at +150°C. For repeated surges, PCB copper pour and adjacent thermal vias are essential to maintain junction temperature below 150°C; pulse derating follows 4.8W/°C above +25°C per the datasheet's Fig. 1 curve.

Is SMBJ13CA-13-F suitable for IEC 61000-4-2 ESD protection?

Yes - it meets IEC 61000-4-2 Level 4 (±15kV air, ±8kV contact) when used with appropriate series impedance (e.g., 100Ω resistor) to limit peak current into the TVS. Its fast response time (<1ns) and low clamping voltage (21.5V) prevent damage to downstream logic, though system-level testing is required to validate full immunity with specific board layout and grounding.