Diodes Incorporated SMBJ22A-13-F

Overview

SMBJ22A-13-F from Diodes Incorporated is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with 22V reverse standoff voltage, 24.4V minimum breakdown voltage at 1mA, 35.5V maximum clamping voltage at 16.9A peak pulse current, and SMB package. It protects DC power rails and signal lines in industrial motor drives against ESD and lightning-induced surges.

For engineers reviewing the SMBJ22A-13-F datasheet, SMBJ22A-13-F pinout, SMBJ22A-13-F application, or SMBJ22A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC V_DD, peak pulse current capability under 8.3ms half-sine surge, thermal derating above +25°C, and RoHS-compliant matte tin termination compatibility with lead-free reflow.

Technical Context

This TVS operates as a fast-acting shunt clamp: under normal bias (V_RWM ≤ 22V), leakage stays below 5μA; when transient exceeds V_BR (24.4–28.0V), it avalanches within <1ns to limit voltage to ≤35.5V at 16.9A. Its glass-passivated die ensures stable parametric performance across -55°C to +150°C junction temperature.

The device uses a single PN junction structure with cathode-band polarity marking for unidirectional operation. It is not rated for bidirectional use-no "C" suffix-and requires correct orientation in series with the protected line to ground, with no internal series impedance or control logic.

Key Specifications

Pinout & Package

Package: SMB (Surface Mount Body), molded plastic case per UL 94V-0, 0.1g mass, 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 transient suppression applications.

Compared with SMBJ22A-E3/52 and P6SMB22A, the SMBJ22A-13-F offers the tightest clamping voltage (35.5V) and lowest leakage (≤5μA), making it optimal for space-constrained industrial controllers where thermal margin and precision rail protection are critical.

Availability

SMBJ22A-13-F is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers, automotive body control modules, and renewable energy inverters requiring stable component supply across multi-year production cycles.

Supply support for SMBJ22A-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 and automotive markets.

The SMBJ series was designed specifically for robust, surface-mount transient suppression in harsh environments-emphasizing repeatable clamping, low leakage, and extended temperature operation without derating penalties.

FAQ

What is the maximum allowable PCB temperature during reflow soldering for SMBJ22A-13-F?

The SMBJ22A-13-F is qualified for lead-free reflow per J-STD-020, with a peak temperature of 260°C for ≤30 seconds. Its matte tin finish and SMB package withstand standard IPC/JEDEC profiles, including ramp rates up to 3°C/s and time above 217°C limited to 60–150 seconds. Preheating to 150°C is recommended to minimize thermal shock.

Can SMBJ22A-13-F be used in bidirectional signal line protection?

No. SMBJ22A-13-F is unidirectional only, indicated by the absence of "C" in its part number. For bidirectional protection (e.g., USB data lines or RS-485), use SMBJ22CA-13-F, which has symmetrical clamping in both polarities and no cathode band. Using SMBJ22A-13-F on AC-coupled signals risks forward conduction and permanent damage.

How does the 4.8W/°C derating factor apply in real-world thermal design?

At ambient temperatures above +25°C, the device's peak pulse power must be linearly reduced by 4.8W per °C rise. For example, at +75°C ambient, maximum usable P_PK drops to 600W − (4.8W/°C × 50°C) = 360W. This reflects junction-to-ambient thermal resistance limitations and must be applied when calculating worst-case surge survivability in enclosed enclosures.

Is SMBJ22A-13-F suitable for protecting 3.3V logic interfaces?

Not directly. Its 22V standoff is too high for 3.3V rails; clamping would occur far above safe logic thresholds. For 3.3V I/O, select lower-voltage TVS devices like SMBJ3.3A-13-F (3.3V standoff, 6.4V clamping). SMBJ22A-13-F is intended for 24V power rails or high-side switched 12V/24V loads where clamping to ≤35.5V preserves downstream regulation.