Diodes Incorporated SMAJ9.0A-13-F

Overview

SMAJ9.0A-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 9.0V reverse standoff voltage, 15.4V max clamping voltage at 26.0A peak pulse current, and fast response time to ESD and surge events. Used in automotive infotainment power rails and industrial sensor I/O protection.

For engineers reviewing the SMAJ9.0A-13-F datasheet, SMAJ9.0A-13-F pinout, SMAJ9.0A-13-F application, or SMAJ9.0A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC V_DD, peak pulse current capability under IEC 61000-4-5 waveform, unidirectional polarity alignment with DC bias, and SMA package thermal performance under sustained surge duty cycles.

Technical Context

This TVS operates as a clamping device triggered by avalanche breakdown above its 10.0–11.1V breakdown voltage range at 1.0mA test current. Its glass-passivated die ensures stable leakage (<5.0µA at 9.0V VRWM) and repeatable clamping behavior across temperature.

The device responds to transients with sub-nanosecond intrinsic switching speed and sustains 400W non-repetitive peak pulse power per the 10/1000µs waveform. Thermal derating begins above +25°C ambient, with full power rated only at TA ≤ +25°C and steady-state dissipation limited to 1.0W at TL = +75°C.

Key Specifications

Pinout & Package

Two-terminal SMA package: anode and cathode terminals aligned along the long axis, with cathode identified by a band on the top surface. The SMA outline measures 4.00–4.60mm in length (B), 2.29–2.92mm in width (A), and 1.27–1.63mm in height (C); lead-free matte tin plating ensures solderability per MIL-STD-202.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ9.0A-13-F, the non-F variant offers identical protection but lacks guaranteed RoHS compliance and green material certification, while SMAJ9.0CA-13-F trades unidirectional leakage advantage for symmetrical clamping-making the original optimal for fixed-polarity 9V power inputs.

Availability

SMAJ9.0A-13-F is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and telecom DC power feeds requiring stable component supply with full traceability and lifecycle support.

Supply support for SMAJ9.0A-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 suppressor product line, engineered specifically for high-reliability board-level surge protection in automotive, industrial, and communications infrastructure applications.

FAQ

What is the maximum operating temperature for SMAJ9.0A-13-F?

The device has a junction temperature range of –55°C to +150°C and a storage temperature range of –55°C to +150°C. Its steady-state power dissipation is rated at 1.0W only when lead temperature (TL) is maintained at +75°C; derating is required above that temperature per Figure 6 in the datasheet.

Does SMAJ9.0A-13-F meet AEC-Q200 stress testing requirements?

No-SMAJ9.0A-13-F is a standard-qualification part. For automotive applications requiring AEC-Q200 qualification, Diodes offers the pin-compatible SMAJ9.0AQ-13-F variant, which undergoes additional stress testing and is manufactured in IATF 16949-certified facilities.

How does the 10/1000µs waveform relate to SMAJ9.0A-13-F's 400W rating?

The 400W peak pulse power rating is defined using the standardized 10/1000µs double-exponential surge waveform (10µs rise, 1000µs decay). At 26.0A peak current and 15.4V clamping voltage, the instantaneous power reaches 400W, confirming compliance with IEC 61000-4-5 test conditions.

Can SMAJ9.0A-13-F be used in parallel for higher surge current handling?

Not recommended-minor parametric mismatches between devices cause current imbalance during surges, leading to premature failure of the unit carrying disproportionate current. For higher current needs, select a higher-rated TVS (e.g., SMBJ9.0A) or verify matched-bin parallel operation with derated total current per Diodes' application guidance.