Diodes Incorporated SMAJ7.0A-13-F

Overview

SMAJ7.0A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 7.0V reverse standoff voltage, 12.0V max clamping voltage at 33.3A peak pulse current, and fast response time under 1ps. Used in automotive body control modules to protect CAN transceiver inputs against ISO 7637-2 load dump and ESD events.

For engineers reviewing the SMAJ7.0A-13-F datasheet, SMAJ7.0A-13-F pinout, SMAJ7.0A-13-F application, or SMAJ7.0A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC V_CC, peak pulse current capability under 8.3ms surge, unidirectional polarity alignment with supply rail, and SMA package thermal performance under sustained ambient up to +150°C.

Technical Context

This TVS operates as a voltage-clamped shunt device triggered by avalanche breakdown when reverse voltage exceeds 7.78V (min V_BR). Its glass-passivated junction ensures stable leakage (<200µA at 7.0V) and repeatable clamping behavior across temperature (-55°C to +150°C).

The device responds to transients within picoseconds and sustains 400W non-repetitive peak pulse power per the 10/1000µs waveform. Its unidirectional configuration requires correct cathode-band orientation toward the protected line's positive rail to avoid forward conduction during normal operation.

Key Specifications

Pinout & Package

Two-terminal SMA package: anode and cathode terminals aligned along the long axis; cathode identified by a band on the top surface. Molded plastic case meets UL 94V-0 flammability rating and J-STD-020 Level 1 moisture sensitivity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P6SMB7.0A and SMAJ7.0A-TP, SMAJ7.0A-13-F offers lower leakage and tighter V_BR tolerance-critical for low-power automotive sensors and high-reliability industrial I/O-while maintaining identical package and surge handling.

Availability

SMAJ7.0A-13-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, USB-C power delivery subsystems, and telecom line card designs requiring stable component supply and AEC-Q101-compliant alternatives.

Supply support for SMAJ7.0A-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 SMAJ series belongs to Diodes' transient voltage suppression product line, engineered specifically for high-energy surge protection in automotive, industrial, and communications infrastructure where reliability under harsh electrical environments is mandatory.

FAQ

What is the maximum operating temperature for SMAJ7.0A-13-F?

The SMAJ7.0A-13-F has a junction operating temperature range of −55°C to +150°C. Its thermal resistance (R_θJA) is optimized for the SMA package, allowing full 400W pulse power derating only when leads are maintained at ambient temperature. At +75°C lead temperature, steady-state power dissipation is rated at 1.0W.

Is SMAJ7.0A-13-F RoHS and halogen-free compliant?

Yes. SMAJ7.0A-13-F carries matte tin lead finish and complies with EU RoHS directives 2011/65/EU and 2015/863/EU. It is also halogen- and antimony-free per Diodes' "Green" definition: <900ppm bromine, <900ppm chlorine, and <1000ppm antimony compounds.

How does SMAJ7.0A-13-F differ from bidirectional variants like SMAJ7.0CA-13-F?

SMAJ7.0A-13-F is unidirectional with a cathode band marking and specified for use between a positive rail and ground. SMAJ7.0CA-13-F is bidirectional, lacks polarity marking, and clamps symmetrically for AC-coupled or floating signal lines. Their breakdown and clamping voltages differ: SMAJ7.0CA has higher V_BR (min 7.78V) but same VC (12.0V), making it unsuitable as a drop-in replacement in DC-biased circuits.

Can SMAJ7.0A-13-F be used in parallel for higher surge current handling?

No. Parallel connection is not recommended due to mismatch in dynamic impedance and avalanche turn-on characteristics, which causes uneven current sharing and potential thermal runaway. For higher surge capability, select a higher-rated part (e.g., SMAJ15A) or use a multi-stage protection scheme with upstream current-limiting resistors or inductors.