Diodes Incorporated SMAJ5.0AQ-13-F

Overview

SMAJ5.0AQ-13-F from Diodes Incorporated is a unidirectional 400W automotive transient voltage suppressor (TVS) diode designed for primary overvoltage protection on power and signal lines in vehicle ECUs, body control modules, and infotainment systems. It features a 5.0V reverse standoff voltage (VRWM), 6.4V minimum breakdown voltage (VBR), 9.2V maximum clamping voltage (VC) at 43.5A peak pulse current, and AEC-Q101 qualification for under-hood applications.

For engineers reviewing the SMAJ5.0AQ-13-F datasheet, SMAJ5.0AQ-13-F pinout, SMAJ5.0AQ-13-F application, or SMAJ5.0AQ-13-F equivalent, key selection criteria include ISO7637-2 Pulse 1/2a/3a/3b surge immunity, ISO10605 ESD robustness (±30kV), clamping ratio (VC/VRWM ≈ 1.84), unidirectional polarity, and SMA package thermal performance up to +175°C junction temperature.

Technical Context

This TVS diode operates as a shunt-clamping device triggered by avalanche breakdown above VRWM, delivering fast response (<1 ns) to transients defined in ISO7637-2 (Pulse 1: −100V, Pulse 2a: +50V, Pulse 3a: −150V, Pulse 3b: +100V) and ISO10605 (±30kV contact/air discharge). Its glass-passivated die ensures stable leakage and repeatable clamping behavior across automotive temperature range (−55°C to +175°C).

Designed for surface-mount integration on 12V/24V automotive power rails and CAN/LIN bus lines, it sustains 40A peak forward surge current (IFSM) under 8.3ms half-sine waveform and dissipates 1.0W steady-state power at TL = +75°C. The cathode-band polarity indicator enables correct orientation during automated placement.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), molded plastic UL 94V-0, moisture sensitivity level 1, 0.064g weight. Cathode band denotes unidirectional polarity; bi-directional variants omit this marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ5.0A-13-F, the SMAJ5.0AQ-13-F adds AEC-Q101 validation and change control-critical for production automotive BOMs-while matching electrical specs; versus 1.5SMC5.0A-Q, it trades surge capacity for space-constrained SMA layout compatibility in compact ECUs.

Availability

SMAJ5.0AQ-13-F is available at Aetrix Electronics and suitable for engine control units, body control modules, infotainment head units, and CAN/LIN bus nodes requiring stable component supply across multi-year automotive production cycles.

Supply support for SMAJ5.0AQ-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 components for automotive, industrial, and computing markets with design centers in US, Germany, Taiwan, and China.

The SMAJ series targets automotive-grade transient suppression, engineered specifically to meet ISO7637-2 and ISO10605 requirements while supporting IATF 16949 production and AEC-Q101 qualification protocols.

FAQ

What is the maximum clamping voltage of SMAJ5.0AQ-13-F at its rated peak pulse current?

The maximum clamping voltage (VC) is 9.2V at 43.5A peak pulse current (IPP), measured per the 10×1000μs waveform defined in Figure 4 of DS40739. This value ensures protected circuits remain below critical overvoltage thresholds during ISO7637-2 Pulse 1 and Pulse 2a events.

Is SMAJ5.0AQ-13-F suitable for bidirectional signal lines like USB or HDMI?

No-SMAJ5.0AQ-13-F is unidirectional and intended for positive-rail protection only. For bidirectional data lines, use the bi-directional variant SMAJ5.0CQ-13-F (suffix C), which provides symmetrical clamping for both polarities and matches the same 5.0V VRWM and 9.2V VC ratings.

How does the SMA package affect thermal performance in high-temperature environments?

The SMA package delivers 1.0W steady-state power dissipation at TL = +75°C, with derating to zero at +175°C junction temperature. Its low thermal resistance (RθJA ≈ 120°C/W typical) requires minimal copper pour; for sustained 400W pulses, localized board copper and airflow must be verified per Figure 1's pulse derating curve.

Does SMAJ5.0AQ-13-F require external series impedance for optimal clamping performance?

Yes-a series impedance (e.g., 1–10Ω resistor or ferrite bead) between the TVS and protected IC improves energy sharing during fast transients and reduces di/dt-induced voltage overshoot. Diodes' application note AP02011 recommends 3.3Ω for CAN bus protection and 5.6Ω for 12V power rail designs using SMAJ devices.