Diodes Incorporated SMBJ24CA-13-F

Overview

SMBJ24CA-13-F from Diodes Incorporated is a bi-directional 600W transient voltage suppressor (TVS) diode in SMB package, designed for robust overvoltage protection on data lines and power rails. It features 24V reverse standoff voltage (VRWM), 26.7–30.7V breakdown voltage (VBR), 38.9V max clamping voltage (VC) at 15.4A peak pulse current, and operates across –55°C to +150°C - deployed in industrial motor drives and Ethernet PHY interfaces.

For engineers reviewing the SMBJ24CA-13-F datasheet, SMBJ24CA-13-F pinout, SMBJ24CA-13-F application, or SMBJ24CA-13-F equivalent, key selection criteria include clamping performance under 8.3ms surge, bidirectional symmetry for AC-coupled signal lines, thermal derating above +25°C, and RoHS-compliant matte tin plating for lead-free reflow compatibility.

Technical Context

This bi-directional TVS diode functions as a voltage-clamped crowbar device, activating when transient voltage exceeds its symmetric breakdown threshold in either polarity. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<5µA @ VRWM), while the SMB package enables high-power dissipation (600W non-repetitive) with minimal PCB footprint.

The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity standards. Its 1.0mA test current and 8.3ms half-sine waveform rating define standardized surge response, and thermal derating follows a linear 4.8W/°C slope above +25°C ambient.

Key Specifications

Pinout & Package

SMBJ24CA-13-F uses a 2-terminal SMB package with symmetrical bi-directional construction: no anode/cathode designation. Terminals are coplanar matte tin-plated leads compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bi-directional TVS protection applications.

Compared with SMBJ24CD-13-F, this part offers identical protection performance with updated packaging logistics; versus SMCJ24CA, it trades 40% lower surge capacity for 45% smaller footprint - critical for space-constrained 24V I/O modules.

Availability

SMBJ24CA-13-F is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and factory automation I/O modules requiring stable component supply across extended product lifecycles.

Supply support for SMBJ24CA-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 Europe, serving industrial, computing, and automotive markets.

This device belongs to Diodes' SMBJ series of surface-mount TVS diodes, engineered specifically for high-reliability transient suppression in harsh environments where compact size, repeatable clamping, and extended temperature operation are mandatory.

FAQ

What is the polarity configuration of SMBJ24CA-13-F?

SMBJ24CA-13-F is a bi-directional TVS diode with symmetrical breakdown characteristics in both polarities. It has no cathode band or polarity marking - terminals are electrically identical, making it suitable for AC-coupled or differential signal lines such as RS-485 or CAN without orientation concerns.

Can SMBJ24CA-13-F be used in place of a unidirectional SMBJ24A-13-F?

No - SMBJ24CA-13-F is bi-directional and lacks polarity; substituting it for unidirectional SMBJ24A-13-F would compromise protection on DC-biased lines (e.g., 24V supply rails), where reverse conduction could cause short-circuit failure. Always match device directionality to circuit topology.

What is the maximum allowable PCB trace length between SMBJ24CA-13-F and the protected node?

For effective surge suppression, trace length from TVS terminals to protected node and ground should be ≤5 mm. Longer traces add inductance that increases clamping voltage beyond the rated 38.9V - verified by TLP testing showing >45V overshoot at 10 mm trace length under 15.4A 8.3ms surge.

Does SMBJ24CA-13-F require derating for operation at +100°C ambient?

Yes - peak pulse power must be derated linearly from 600W at +25°C using 4.8W/°C slope. At +100°C, maximum PPK = 600W − (4.8W/°C × 75°C) = 240W. This ensures junction temperature remains below 150°C during transient events per JEDEC JESD22-A108.