Diodes Incorporated SMBJ45A-13-F

Overview

SMBJ45A-13-F from Diodes Incorporated is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with 45V reverse standoff voltage, 50.0V minimum breakdown voltage at 1mA test current, and 72.7V maximum clamping voltage at 8.3A peak pulse current. It features glass-passivated die construction, SMB package, and is rated for automotive-grade operating temperature range (−55°C to +150°C), used in DC power rail protection for industrial motor drives.

For engineers reviewing the SMBJ45A-13-F datasheet, SMBJ45A-13-F pinout, SMBJ45A-13-F application, or SMBJ45A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC V_DD, peak pulse current capability under IEC 61000-4-5 surge conditions, thermal derating above +25°C, and RoHS-compliant matte tin lead finish compatibility with lead-free reflow profiles.

Technical Context

This TVS diode operates as a fast-acting shunt clamp during voltage transients, triggering when reverse voltage exceeds 50.0V (V_BR) and limiting downstream voltage to ≤72.7V (V_C) at 8.3A (I_PP). Its unidirectional configuration provides polarity-specific protection on positive-rail lines only.

Designed for single-pulse surge suppression per IEC 61000-4-5 (10/1000μs waveform), it delivers 600W peak pulse power with 4.8W/°C derating above +25°C ambient and withstands 100A non-repetitive forward surge (8.3ms half-sine) without failure.

Key Specifications

Pinout & Package

Package: SMB (Surface Mount Body), molded plastic case per UL 94V-0, 0.1g mass, 3.30–3.94mm length × 4.06–4.57mm width × 1.96–2.21mm height. Cathode band denotes polarity for unidirectional operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ45CA-13-F, the unidirectional SMBJ45A-13-F provides lower leakage and sharper turn-on for DC rails; versus SMCJ45A, it trades peak power for compact SMB footprint-optimal for space-constrained 24–48V industrial controls.

Availability

SMBJ45A-13-F is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and programmable logic controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SMBJ45A-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 U.S.

The SMBJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for robust, surface-mount surge protection in automotive, industrial, and telecom infrastructure applications where reliability under harsh electrical stress is critical.

FAQ

What is the maximum clamping voltage of SMBJ45A-13-F at its rated peak pulse current?

The maximum clamping voltage (V_C) is 72.7V at 8.3A peak pulse current (I_PP) under the standard 10/1000μs waveform. This value is measured with 1.0mA test current for breakdown voltage and confirmed per DS19002 Rev. 20-2, page 3, ensuring predictable overvoltage limiting during surge events.

Is SMBJ45A-13-F suitable for automotive applications requiring AEC-Q200 qualification?

No-SMBJ45A-13-F is not AEC-Q200 qualified. While it operates from −55°C to +150°C and meets industrial surge standards, Diodes Incorporated does not list this specific part number in its AEC-Q200-certified TVS portfolio. For automotive use, consider the AEC-Q200 qualified P4SMAJ45A or SMAJ45A series instead.

How does the SMB package of SMBJ45A-13-F affect thermal performance compared to DO-214AA (SMB) variants from other manufacturers?

The SMB package dimensions (3.30–3.94mm × 4.06–4.57mm × 1.96–2.21mm) match JEDEC MO-136, enabling direct PCB footprint compatibility. Thermal resistance from junction-to-ambient is ~100°C/W with standard 1-in² copper pad; actual performance depends on board layout-not manufacturer-specific variation-as all SMB packages adhere to the same mechanical standard.

Can SMBJ45A-13-F be used to protect a 3.3V logic line?

No-it is not suitable. With a 45V reverse standoff voltage and 50V minimum breakdown, SMBJ45A-13-F triggers far above 3.3V logic levels and would not clamp before damage occurs. For 3.3V circuits, select a TVS with V_RWM ≤ 3.6V (e.g., SMBJ3.3A) to ensure clamping begins near the IC's absolute maximum rating.