Diodes Incorporated SMBJ28A-13-F

Overview

SMBJ28A-13-F from Diodes Incorporated is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with 28V reverse standoff voltage, 31.1V minimum breakdown voltage, and 45.4V maximum clamping voltage at 13.2A peak pulse current-designed to protect DC power rails and I/O lines in industrial motor drives against ESD and lightning-induced surges.

For engineers reviewing the SMBJ28A-13-F datasheet, SMBJ28A-13-F pinout, SMBJ28A-13-F application, or SMBJ28A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC V_DD, peak pulse current capability under 8.3ms waveform, thermal derating above +25°C, and SMB package compatibility with automated SMT assembly.

Technical Context

This TVS operates as a voltage-clamped shunt protector: under normal bias (V_RWM = 28V), leakage remains ≤5.0μA; when transient exceeds V_BR (31.1–35.8V @ 1.0mA), it avalanches into low-impedance conduction to clamp voltage to ≤45.4V at I_PP = 13.2A.

Its glass-passivated junction ensures stable breakdown characteristics across -55°C to +150°C operating range, while the SMB package supports 4.8W/°C thermal derating above ambient and 5.0W steady-state dissipation at T_L = +75°C-enabling reliable surge handling in thermally constrained PCB layouts.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), molded plastic case rated UL 94V-0, 0.1g weight, matte tin-plated terminals solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unidirectional TVS diode applications.

Compared with SMBJ28A-E3/52 and P6SMB28A, the SMBJ28A-13-F offers identical clamping performance to the ON Semiconductor part while meeting modern RoHS and halogen-free standards-making it the preferred choice for new industrial and automotive designs requiring full environmental compliance.

Availability

SMBJ28A-13-F is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supply designs requiring stable component supply, consistent surge performance, and full RoHS/halogen-free compliance.

Supply support for SMBJ28A-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.

The SMBJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability board-level ESD and surge protection in industrial, automotive, and communications equipment where compact size and repeatable clamping are critical.

FAQ

What is the maximum allowable mounting temperature for SMBJ28A-13-F during reflow soldering?

The SMBJ28A-13-F uses matte tin plating compliant with J-STD-020 Level 1 moisture sensitivity, allowing standard lead-free reflow profiles with peak temperatures up to 260°C. Its molded plastic case is rated UL 94V-0 and withstands typical 60–90 second exposure above 235°C without delamination or marking degradation.

Can SMBJ28A-13-F be used in bi-directional protection applications?

No-SMBJ28A-13-F is unidirectional, indicated by the absence of "C" suffix. For bi-directional protection at 28V standoff, the correct part is SMBJ28CA-13-F, which has symmetrical clamping for AC-coupled or floating lines and double the leakage current specification at VRWM.

How does thermal derating affect the 600W peak pulse rating above +25°C ambient?

Per DS19002 Rev. 20-2, the SMBJ28A-13-F derates linearly at 4.8W/°C above +25°C. At +75°C ambient, its peak pulse power drops to 360W (600W − 4.8W × 50°C), requiring system-level validation of surge energy under elevated temperature conditions.

Is the 13.2A peak pulse current rating valid for repetitive surges?

No-the 13.2A rating applies only to non-repetitive 8.3ms half-sine wave pulses, with maximum duty cycle of four pulses per minute. Repetitive surge testing requires derating both current and frequency per the pulse derating curve in Figure 1 of the datasheet to avoid junction overheating.