STMicroelectronics SMA6F10A

Overview

SMA6F10A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for primary-level surge protection in DC power lines and signal interfaces. It features a 10 V stand-off voltage (VRM), 11.1–12.3 V breakdown voltage (VBR), 17 V clamping voltage (VCL) at 1 A IPP, and operates up to 175 °C junction temperature - enabling robust protection in automotive body electronics, industrial I/O modules, and PoE-powered devices.

For engineers reviewing the SMA6F10A datasheet, SMA6F10A pinout, SMA6F10A application, or SMA6F10A equivalent, key selection criteria include its low 0.2 μA leakage at 25 °C, high-temperature stability up to 175 °C, 25 kV contact/30 kV air ESD immunity per IEC 61000-4-2 Level 4, and compatibility with standard SMA flat package PCB layouts.

Technical Context

The SMA6F10A employs planar silicon avalanche technology to deliver precise, repeatable clamping behavior during fast transients. Its unidirectional configuration supports DC-biased lines where reverse polarity is not expected, and its low dynamic resistance (0.127 Ω at 10/1000 µs) ensures minimal voltage overshoot under 1 A peak pulse current.

Thermal design is enabled by a maximum junction temperature of 175 °C and thermal impedance curves showing <100 °C/W for single-pulse operation on FR4 with recommended copper area. The device complies with J-STD-020 MSL Level 1 and passes JEDEC JESD22-B102 E3 solderability testing.

Key Specifications

Pinout & Package

The SMA6F10A is housed in an industry-standard SMA (DO-214AC) flat package with two terminals: cathode (marked end) and anode. The package measures 2.25–2.90 mm in length (D), 5.00–5.35 mm in width (E), and 0.90–1.10 mm in height (A), with matte tin-plated leads compliant with RoHS and JEDEC standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ10A and 1.5SMC10A, the SMA6F10A delivers optimal balance of 600 W surge capacity, ultra-low leakage, and high-temperature operation in the compact SMA footprint - making it preferred for space-constrained, thermally demanding applications such as automotive ADAS domain controllers and DIN-rail mounted edge gateways.

Availability

SMA6F10A is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial programmable logic controllers, and smart grid metering equipment requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for SMA6F10A 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, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.

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 elevated junction temperature operation are critical design requirements.

FAQ

What is the maximum clamping voltage of SMA6F10A under a 10/1000 µs surge?

The SMA6F10A clamps to a maximum of 17 V when subjected to a 1 A peak pulse current with a 10/1000 µs waveform, as specified in Table 2 of DS12564 Rev 3. This value is measured at 25 °C ambient and remains stable across its full operating temperature range due to low voltage temperature coefficient (αT = 7.8 × 10⁻⁴ /°C).

Can SMA6F10A be used in bidirectional signal lines?

No - SMA6F10A is a unidirectional TVS diode intended only for DC-biased or ground-referenced lines. For bidirectional protection (e.g., RS-485, USB D+/D−), ST recommends the complementary SMA6F10CA variant, which provides symmetrical clamping above and below ground with identical VRM and VCL ratings.

Does SMA6F10A require derating at elevated ambient temperatures?

Yes - while the device is rated for 175 °C junction temperature, its peak pulse power must be derated above 25 °C ambient. Figure 3 in DS12564 shows that at 125 °C ambient, the 10/1000 µs power rating drops to ~400 W. Designers must use thermal modeling and layout copper area to maintain Tj ≤ 175 °C under worst-case surge repetition.

Is the SMA6F10A compatible with lead-free reflow processes?

Yes - the device uses matte tin-plated leads and is qualified for lead-free reflow per J-STD-020 MSL Level 1. Its recommended reflow profile peaks at 240–245 °C for 2–3 seconds, matching standard Pb-free SAC305 process windows, and it withstands up to 260 °C for 10 seconds during manual soldering.