Diodes Incorporated SMAJ16A-13-F

Overview

SMAJ16A-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 16V reverse standoff voltage (VRWM), 26.0V maximum clamping voltage at 15.3A peak pulse current, and fast response time under 1.0ps. Used in automotive infotainment power rails to suppress load dump and ISO 7637-2 transients.

For engineers reviewing the SMAJ16A-13-F datasheet, SMAJ16A-13-F pinout, SMAJ16A-13-F application, or SMAJ16A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current capability under 8.3ms half-sine surge, unidirectional polarity alignment with DC bias, and SMA package thermal performance under PCB copper area constraints.

Technical Context

This TVS operates as a voltage-clamped shunt protector: when transient voltage exceeds its breakdown threshold (17.8–19.7V), it avalanches into low-impedance conduction to divert surge current away from downstream circuitry. Its glass-passivated die ensures stable leakage (<5µA at 16V) and repeatable clamping behavior across temperature (-55°C to +150°C).

The device uses a single-junction PN structure optimized for high-energy transient absorption-not ESD-only protection-and is rated for non-repetitive 400W pulses per JEDEC-standard 10/1000µs waveform. Its 1.0W steady-state power dissipation at TL=75°C supports continuous operation in thermally constrained layouts.

Key Specifications

Pinout & Package

Two-terminal SMA (DO-214AC) package with cathode band marking on unidirectional devices. Terminals are anode (unmarked end) and cathode (banded end); polarity must align with DC bias direction for proper clamping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ16A-13-F, SMAJ16A-E3/5A offers identical clamping performance with relaxed leakage tolerance, while P6SMB16A trades compactness for higher surge capacity and larger thermal mass-making each suitable for distinct layout and reliability trade-offs.

Availability

SMAJ16A-13-F is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and telecom DC power inputs requiring stable component supply, consistent parametric performance, and full traceability across production lots.

Supply support for SMAJ16A-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 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 equipment where precise clamping, low leakage, and AEC-Q200-aligned construction are required.

FAQ

What is the maximum operating temperature for SMAJ16A-13-F?

The SMAJ16A-13-F has a junction temperature range of –55°C to +150°C and a storage temperature range of –55°C to +150°C. Its thermal derating curve shows 100% pulse power capability at ambient ≤25°C, decreasing linearly to ~50% at +100°C ambient. Lead temperature must be maintained ≤75°C for full 1.0W steady-state dissipation.

Is SMAJ16A-13-F suitable for bidirectional signal line protection?

No-SMAJ16A-13-F is unidirectional and intended for DC-biased lines like power rails. For bidirectional signal lines (e.g., RS-485, CAN), use the bidirectional variant SMAJ16CA-13-F, which lacks polarity marking and clamps symmetrically above and below ground.

How does the clamping voltage of SMAJ16A-13-F compare to its breakdown voltage?

Its minimum breakdown voltage is 17.8V at 1.0mA test current, while its maximum clamping voltage is 26.0V at 15.3A peak pulse current. This 8.2V differential represents the dynamic impedance (≈0.54Ω) during surge conduction-critical for calculating voltage overshoot at the protected IC's input.

Can SMAJ16A-13-F be used in parallel for higher surge current handling?

Not recommended without external balancing-minor parametric variations between units cause current sharing imbalance, leading to premature failure of one device. For higher current, select a single higher-rated TVS (e.g., SMAJ20A) or verify matched binning and thermal coupling per Diodes' application note AN-2001.