STMicroelectronics SMA6F130AY

Overview

SMA6F130AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMA Flat package, designed to clamp transient overvoltages up to 209 V (10/1000 µs) at 3 A peak pulse current while maintaining low leakage (0.2 µA @ 25 °C) and supporting junction temperatures up to +175 °C. It delivers 600 W peak pulse power (10/1000 µs) and exceeds ISO 10605 ESD immunity (±30 kV contact/air) and ISO 7637-2 pulse robustness (Pulse 1: −150 V; Pulse 3a: −220 V), targeting 12 V/24 V automotive power line protection.

For engineers reviewing the SMA6F130AY datasheet, SMA6F130AY pinout, SMA6F130AY application, or SMA6F130AY equivalent, key selection criteria include clamping voltage (209 V @ 3 A), stand-off voltage (130 V), thermal derating above 25 °C, IEC 61000-4-4 level 4 surge compliance, and compatibility with high-reliability automotive PCB layouts using JEDEC-standard SMA Flat footprint.

Technical Context

This unidirectional TVS diode uses planar silicon technology to achieve stable breakdown behavior across −55 °C to +175 °C operating junction temperature, with a temperature coefficient α_T of 10.8 × 10⁻⁴/°C for V_BR and V_CL. Its dynamic resistance R_D is 7 Ω (typ.) at 10/1000 µs, enabling precise clamping under fast transients.

The device meets stringent automotive stress standards: ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V); IEC 61000-4-4 Level 4 (±4 kV); and ISO 10605 (±30 kV, C = 150/330 pF, R = 330 Ω). It is rated for MSL Level 1 and UL94 V0 flammability.

Key Specifications

Pinout & Package

The SMA6F130AY is housed in a flat, surface-mount SMA Flat package (JEDEC DO-214AC), measuring 2.25–2.90 mm × 5.00–5.35 mm × 0.90–1.10 mm height, with matte tin-plated leads and IPC7531-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMA6F120AY and SMA6F154AY, the SMA6F130AY provides optimal balance for standard 12 V automotive systems: sufficient V_RM margin above 13.5 V battery float voltage, clamping low enough to protect common 24 V-rated power management ICs, and peak current capability aligned with typical ISO 7637-2 test profiles.

Availability

SMA6F130AY is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and ADAS camera power systems requiring stable component supply with AEC-Q101 assurance and long-term automotive lifecycle support.

Supply support for SMA6F130AY 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 automotive, industrial, and power discrete solutions with vertical manufacturing and rigorous quality certification.

The SMA6FY Transil series targets automotive electronics protection, specifically engineered to meet ISO 7637-2, ISO 10605, and IEC 61000-4-4 requirements while supporting high-temperature under-hood operation and long-term reliability in safety-critical ECUs.

FAQ

What is the maximum clamping voltage of SMA6F130AY under a 10/1000 µs surge?

The maximum clamping voltage (V_CL) is 209 V at a peak pulse current (I_PP) of 3 A for a 10/1000 µs waveform, measured at T_amb = 25 °C. This value increases with junction temperature per the coefficient α_T = 10.8 × 10⁻⁴/°C, reaching approximately 225 V at T_j = 150 °C.

Can SMA6F130AY be used in 24 V automotive systems?

No - SMA6F130AY has a 130 V stand-off voltage (V_RM) optimized for 12 V nominal systems. For 24 V applications, ST recommends SMA6F154AY (V_RM = 154 V) or SMA6F170AY (V_RM = 170 V), which provide appropriate voltage margin above 28 V battery float and comply with ISO 7637-2 Pulse 3b (+150 V).

Does SMA6F130AY require derating for PCB copper area?

Yes - thermal resistance (R_th(j-a)) improves with increased copper area under each lead: from ~140 °C/W with 0 cm² to ~40 °C/W with 4.5 cm² per lead (Figure 11). For sustained surge duty or high ambient temperatures, design with ≥2 cm² total copper per lead to maintain T_j < 150 °C during repetitive transients.

Is SMA6F130AY compatible with lead-free reflow soldering?

Yes - it is qualified for lead-free reflow per J-STD-020 MSL Level 1, with a maximum peak temperature of 240–245 °C (Figure 24). The matte tin plating and flat package geometry ensure reliable wetting and coplanarity; no pre-bake is required due to its moisture sensitivity classification.