Diodes Incorporated SMBJ13A-13-F

Overview

SMBJ13A-13-F from Diodes Incorporated is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with 13.0V reverse standoff voltage, 14.4V minimum breakdown voltage at 1.0mA test current, and 21.5V maximum clamping voltage at 27.9A peak pulse current. It features glass-passivated die construction, SMB package, and is rated for industrial-grade operating temperatures from –55°C to +150°C. It protects DC power rails and I/O lines in automotive body electronics and industrial PLC input modules.

For engineers reviewing the SMBJ13A-13-F datasheet, SMBJ13A-13-F pinout, SMBJ13A-13-F application, or SMBJ13A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC V_DD, peak pulse current capability under 8.3ms surge, standoff voltage alignment with nominal bus voltage, and SMB footprint compatibility with board space constraints.

Technical Context

This unidirectional TVS diode operates as a fast-acting shunt clamp during ESD or lightning-induced transients, triggering when reverse voltage exceeds 14.4V and limiting downstream voltage to ≤21.5V at 27.9A. Its glass-passivated junction ensures stable leakage (<5.0μA at 13.0V) and repeatable breakdown behavior across temperature.

The device complies with IEC 61000-4-2 Level 4 (±15kV contact) and IEC 61000-4-5 (4kV 8/20μs), with thermal derating of 4.8W/°C above +25°C ambient and steady-state power dissipation of 5.0W at lead temperature +75°C.

Key Specifications

Pinout & Package

Package: SMB (Surface Mount Body), molded plastic case per UL 94V-0, 3.30–3.94mm length × 4.06–4.57mm width × 1.96–2.21mm height, cathode band marking on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ13CA-13-F, the unidirectional SMBJ13A-13-F provides lower leakage and sharper turn-on for DC rails, while SAC13-015L trades smaller size for higher surge capacity-making SMBJ13A optimal for space-constrained 12V industrial and automotive protection where 600W suffices.

Availability

SMBJ13A-13-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and DC motor drive power stages requiring stable component supply and full traceability.

Supply support for SMBJ13A-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 North America.

The SMBJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability DC rail and interface line protection in automotive, industrial, and computing applications where compact size and repeatable clamping performance are critical.

FAQ

What is the maximum clamping voltage of SMBJ13A-13-F at its rated peak pulse current?

The maximum clamping voltage is 21.5V at 27.9A peak pulse current (I_PP) under the standardized 8.3ms half-sine waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and represents the highest voltage imposed on the protected line during worst-case surge conditions.

Is SMBJ13A-13-F suitable for protecting RS-485 bus lines?

SMBJ13A-13-F is unidirectional and therefore not ideal for differential RS-485 lines without additional circuitry. For RS-485, a bi-directional variant like SMBJ13CA-13-F-or a dedicated RS-485 TVS array-is recommended to handle both positive and negative transients on A and B lines simultaneously.

Does SMBJ13A-13-F meet automotive qualification standards?

While not AEC-Q200 qualified out-of-the-box, SMBJ13A-13-F meets key automotive surge immunity requirements including ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 4kV. Customers implementing it in automotive applications should perform board-level validation per their specific OEM requirements.

How does the SMB package compare to SMA in terms of thermal performance?

The SMB package offers ~20% higher thermal resistance than SMA due to reduced copper pad area and shorter leadframe paths, resulting in lower steady-state power dissipation (5.0W at T_L = +75°C vs. SMA's ~6.5W). However, SMB's superior surge robustness per unit volume makes it preferred for transient-only protection where average power is negligible.