Diodes Incorporated SMAJ10A-13

Overview

SMAJ10A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with 10V reverse standoff voltage, 11.1–12.3V breakdown voltage at 1mA, and 17.0V max clamping voltage at 23.5A peak pulse current. It provides robust ESD and surge protection for DC power rails and signal lines in industrial power supplies and automotive control modules.

For engineers reviewing the SMAJ10A-13 datasheet, SMAJ10A-13 pinout, SMAJ10A-13 application, or SMAJ10A-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC V_DD, peak pulse current capability under IEC 61000-4-5 8/20µs surges, unidirectional polarity requirement, and SMA package thermal performance under sustained ambient temperatures up to +150°C.

Technical Context

This TVS diode operates in avalanche breakdown mode during overvoltage events, delivering fast response (<1ps) and low dynamic impedance to limit transient energy delivered to downstream circuitry. Its glass-passivated junction ensures stable leakage and breakdown characteristics across temperature.

Designed for unidirectional DC line protection, it conducts only when anode-to-cathode voltage exceeds V_BR; reverse leakage remains ≤5.0µA at 10V VRWM, enabling low-power standby compatibility. Derating curves confirm usable pulse power down to 25% of 400W at +125°C ambient.

Key Specifications

Pinout & Package

Two-terminal device in SMA (DO-214AC) package: Cathode indicated by band on body; Anode and Cathode terminals are non-polarized in layout but functionally asymmetric. Package dimensions: 4.00–4.60mm width × 2.29–2.92mm height × 1.27–1.63mm thickness.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ10A-13, the -F variant offers identical protection with RoHS compliance, while P6SMB10A trades smaller SMA size for higher pulse power and clamping voltage-making it preferable for harsher surge environments where board space permits.

Availability

SMAJ10A-13 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and smart energy metering systems requiring stable component supply across multi-year production cycles.

Supply support for SMAJ10A-13 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 California, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability DC line protection in automotive, industrial, and communications infrastructure where compact size and repeatable clamping performance are critical.

FAQ

Is SMAJ10A-13 bidirectional or unidirectional?

SMAJ10A-13 is unidirectional. The absence of "C" in the part number (e.g., SMAJ10CA-13) confirms its unidirectional configuration, meaning it clamps only when cathode voltage exceeds anode voltage by ≥V_BR. It exhibits low leakage (<5.0µA) at 10V reverse bias and conducts fully during positive transients on the cathode side.

What is the maximum allowable PCB trace length between SMAJ10A-13 and the protected IC?

For optimal clamping performance, keep the total loop inductance below 10nH. This typically requires combined anode and cathode trace lengths under 15mm using 0.5mm-wide traces on outer layers. Longer paths increase V_PEAK = L·di/dt, risking overshoot beyond the 17.0V clamping voltage during fast-rising transients.

Can SMAJ10A-13 be used in parallel to increase surge current handling?

No-parallel connection is not recommended due to mismatched V_BR tolerances (±5%) causing current imbalance. One device may absorb >80% of the surge, exceeding its 23.5A rating. For higher current needs, select a single higher-rated device like SMAJ15A-13 or use a dedicated multi-chip TVS array.

Does SMAJ10A-13 meet AEC-Q200 stress test requirements?

SMAJ10A-13 is not AEC-Q200 qualified. While its −55°C to +150°C operating range aligns with Grade 1 automotive temperature requirements, Diodes Incorporated does not list this specific variant in its AEC-Q200-certified product catalog. For automotive safety-critical applications, consider the AEC-Q200-qualified SMAJ10AHE3_A/H series instead.