Diodes Incorporated SMBJ350A-13-F

Overview

SMBJ350A-13-F from Diodes Incorporated is a 600W surface-mount transient voltage suppressor (TVS) diode designed for unidirectional overvoltage protection in DC power lines and signal interfaces. It features a 350V reverse standoff voltage, 567V maximum clamping voltage at 1.1A peak pulse current, and glass-passivated die construction for robust surge immunity in industrial power supplies and telecom infrastructure.

For engineers reviewing the SMBJ350A-13-F datasheet, SMBJ350A-13-F pinout, SMBJ350A-13-F application, or SMBJ350A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC V_MAX, I_PP capability under 8.3ms surge waveforms, thermal derating above 25°C ambient, and SMB package compatibility with automated PCB assembly.

Technical Context

This unidirectional TVS diode operates as a voltage-clamped shunt protector: it remains high-impedance below 350V (V_RWM) and transitions to low-impedance conduction when transient voltage exceeds 391V (V_{BR min}). Its 567V clamping voltage is guaranteed at 1.1A I_PP under standardized 8.3ms half-sine waveform testing.

Thermal design requires attention to steady-state power dissipation (5.0W at T_L = 75°C) and pulse derating-4.8W/°C above 25°C ambient-with full pulse power limited to 600W only at T_A = 25°C and non-repetitive duty (≤4 pulses/minute).

Key Specifications

Pinout & Package

Case: SMB (Surface Mount Body), molded plastic per UL 94V-0; polarity indicated by cathode band; weight ≈ 0.1g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ350A-13-F, the Vishay SMBJ350A-E3/5A offers identical protection parameters and sourcing flexibility, while the ON Semiconductor P6SMB350A provides equivalent clamping performance with broader legacy design adoption-both support drop-in replacement in SMB-layout PCBs without requalification.

Availability

SMBJ350A-13-F is available at Aetrix Electronics and suitable for industrial power supplies, telecom line interfaces, and automotive body control modules requiring stable component supply with consistent RoHS-compliant manufacturing and tape-and-reel packaging.

Supply support for SMBJ350A-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, specializing in high-reliability protection, power management, and signal integrity solutions for industrial, computing, and communications markets.

The SMBJ series is engineered specifically for robust transient suppression in harsh environments-optimized for fast clamping, repeatable surge endurance, and compatibility with automated SMT assembly processes across consumer, industrial, and telecom applications.

FAQ

What is the maximum clamping voltage of SMBJ350A-13-F and under what test condition?

The maximum clamping voltage is 567V, measured at 1.1A peak pulse current (I_PP) using an 8.3ms single half-sine waveform per REA 10/1000 standard. This value is guaranteed across temperature and represents the highest voltage imposed on the protected circuit during that specific surge event.

Can SMBJ350A-13-F be used in bidirectional protection circuits?

No-SMBJ350A-13-F is a unidirectional TVS diode with cathode-band polarity marking. For bidirectional protection, a symmetric device such as SMBJ350CA (center-tapped, dual-anode configuration) must be used; substituting this part in AC or differential-line applications will result in forward conduction and failure.

How does the SMB package affect thermal performance compared to SMA or SMC?

The SMB package has lower thermal resistance than SMA but higher than SMC: its 5.0W steady-state dissipation rating at T_L = 75°C reflects moderate PCB copper area requirements. Unlike SMC, SMB cannot handle >600W pulse power without strict ambient control, and unlike SMA, it supports higher I_FSM (100A) due to improved leadframe geometry.

Is SMBJ350A-13-F suitable for automotive applications requiring AEC-Q200 qualification?

No-this part is commercial-grade (not AEC-Q200 qualified). While its operating temperature range (-55°C to +150°C) meets automotive junction limits, it lacks the stress-test validation (temperature cycling, humidity bias, mechanical shock) required for automotive ECUs. Use AEC-Q200-qualified equivalents like SMBJ350A-Q for such applications.