STMicroelectronics SMA6F13A

Overview

SMA6F13A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for primary-level surge protection in DC power rails and signal lines. It features a 13 V stand-off voltage (VRM), 14.4–16.0 V breakdown voltage (VBR) at 1 mA, and clamps to ≤21.5 V at 29 A (10/1000 µs), enabling robust IEC 61000-4-2 Level 4 ESD protection (±25 kV contact / ±30 kV air) in automotive body electronics and industrial sensor interfaces.

For engineers reviewing the SMA6F13A datasheet, SMA6F13A pinout, SMA6F13A application, or SMA6F13A equivalent, key selection criteria include clamping voltage under 29 A surge, low leakage (<0.2 µA @ 25 °C), high junction temperature capability (up to +175 °C), and compatibility with standard SMA flat package reflow profiles per J-STD-020 MSL level 1.

Technical Context

The SMA6F13A employs planar silicon avalanche technology to deliver precise voltage clamping during fast transients. Its unidirectional configuration supports DC-biased circuits where reverse polarity protection is not required, and its dynamic resistance of 0.190 Ω ensures minimal voltage overshoot under high-current pulses.

Thermal performance is optimized for sustained operation: maximum junction temperature reaches +175 °C, and peak pulse power remains at 400 W even at Tj = 175 °C (10/1000 µs). The device complies with IEC 61000-4-2, UL94 V0, and JEDEC-standard footprint requirements.

Key Specifications

Pinout & Package

The SMA6F13A uses the industry-standard SMA (DO-214AC) flat package: 2.25–2.90 mm length, 5.00–5.35 mm width, 0.90–1.10 mm height, matte tin-plated leads, and JEDEC-compliant footprint. It is a two-terminal surface-mount device with no polarity marking on the cathode band per Figure 14; orientation follows standard SMA tape-and-reel configuration (Figure 15).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ13A and 1.5SMC13A, the SMA6F13A uniquely balances 600 W surge handling, SMA footprint compatibility, and sub-1 µA leakage at 85 °C-making it optimal for space-constrained, thermally aggressive automotive and industrial nodes where both size and reliability are non-negotiable.

Availability

SMA6F13A is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN networks, smart metering systems, and outdoor IoT sensor nodes requiring stable component supply across extended temperature and surge stress conditions.

Supply support for SMA6F13A 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power discrete solutions with vertical manufacturing control.

The SMA6F series belongs to ST's Transil™ TVS portfolio, engineered specifically for high-reliability transient suppression in harsh-environment electronics where long-term stability, low leakage, and high-temperature operation are critical.

FAQ

What is the maximum clamping voltage of SMA6F13A under a 10/1000 µs surge?

The maximum clamping voltage is 21.5 V at 29 A for a 10/1000 µs waveform, measured at T_amb = 25 °C. This value increases with junction temperature per the α_T coefficient (8.4 × 10⁻⁴/°C), reaching ~23.1 V at T_j = 125 °C using the formula V_CL(T_j) = V_CL(25 °C) × [1 + α_T × (T_j − 25)].

Can SMA6F13A be used in bidirectional signal line protection?

No - SMA6F13A is strictly unidirectional and lacks symmetrical breakdown behavior. For bidirectional protection (e.g., USB, RS-232), ST recommends the SMA6F13CA variant or discrete back-to-back diode configurations. Using SMA6F13A on AC-coupled or floating lines risks reverse conduction failure.

Is the SMA6F13A RoHS and REACH compliant?

Yes - it carries ST's ECOPACK®2 qualification, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead finish is matte tin, and halogen-free packaging is confirmed per ST's public compliance documentation (ECOPACK® status accessible via www.st.com/ecopack).

What is the recommended PCB footprint for SMA6F13A?

The recommended footprint matches JEDEC DO-214AC and IPC7531 standards: pad length ≥3.9 mm, pad width ≥1.2 mm, solder mask opening ≥0.2 mm beyond copper, and 35 µm Cu thickness on FR4. Thermal relief vias under pads improve heat dissipation during surge events, especially in high-density layouts.