Diodes Incorporated SMBJ17CA-13-F

Overview

SMBJ17CA-13-F from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in SMB package, rated for 600W peak pulse power, 17V reverse standoff voltage (VRWM), 27.6V max clamping voltage at 21.7A peak pulse current, and operating from –55°C to +150°C. It protects DC power rails and I/O lines in industrial motor drives against ESD, lightning-induced surges, and inductive switching transients.

For engineers reviewing the SMBJ17CA-13-F datasheet, SMBJ17CA-13-F pinout, SMBJ17CA-13-F application, or SMBJ17CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, bidirectional capability for AC-coupled or floating signal paths, thermal derating above +25°C, and compatibility with automated SMT assembly using standard reflow profiles for SMB packages.

Technical Context

This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC signals, differential buses (e.g., RS-485), and ungrounded interfaces without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<5 µA at VRWM).

The device uses a single silicon junction with no internal series impedance; clamping behavior follows the standard avalanche diode model defined by IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge). Thermal resistance from junction-to-lead is optimized for SMB package mounting on 1-in² copper area.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, molded plastic case with UL 94V-0 flammability rating, 0.1 g typical weight, matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ17CA-13-F, SP1003-017 offers marginally higher clamping voltage but broader global distribution, while P6SMB17CA delivers exact parametric and mechanical equivalence-making it ideal for qualification continuity in high-reliability programs.

Availability

SMBJ17CA-13-F is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers, outdoor LED lighting systems, and DC power distribution units requiring stable component supply across multi-year production cycles.

Supply support for SMBJ17CA-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-energy surge immunity in industrial, automotive, and infrastructure applications where reliability under repetitive surge stress is critical.

FAQ

What is the meaning of the "C" in SMBJ17CA?

The "C" suffix denotes bi-directional configuration - the device provides symmetrical clamping for both positive and negative transients, unlike uni-directional variants (e.g., SMBJ17A) that only clamp one polarity. This makes SMBJ17CA suitable for AC signal lines, floating grounds, and differential interfaces without polarity concerns.

Can SMBJ17CA-13-F be used in place of a uni-directional TVS?

Yes, but only if circuit topology allows symmetric clamping and no DC bias conflicts exist. Bi-directional devices exhibit ~2× higher leakage near VRWM compared to uni-directional equivalents. For 17 V DC rails, SMBJ17CA's 5 µA leakage is acceptable; however, in ultra-low-power sensor nodes, uni-directional SMBJ17A (1 µA leakage) may be preferable.

What is the recommended PCB pad layout for SMBJ17CA-13-F?

Diodes Incorporated specifies an SMB footprint with 2.50 mm pad width, 6.80 mm overall length (X1), and 2.30 mm terminal spacing (Y). Use minimum 1-in² copper pour connected to each pad via multiple thermal vias for optimal power dissipation during surge events - critical to maintain clamping performance at elevated ambient temperatures.

How does SMBJ17CA-13-F perform under repeated surge stress?

Per DS19002 Rev. 20–2, the device is rated for non-repetitive pulses only (max 4 pulses/minute). Repeated surges exceeding this duty cycle cause cumulative junction heating and accelerated parameter shift. For applications with frequent transients, derate peak current by 20% or implement active current limiting upstream to ensure long-term reliability.