Vishay General Semiconductor - Diodes Division SMA6F30A-M3/I

Overview

SMA6F30A-M3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SlimSMA (DO-221AC) package, designed for clamping voltage transients on power and signal lines. It features 30 V stand-off voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA, 48.4 V maximum clamping voltage (VC) at 12.4 A (10/1000 μs), 600 W peak pulse power, and ESD immunity per IEC 61000-4-2 level 4 (15 kV air / 8 kV contact).

For engineers reviewing the SMA6F30A-M3/I datasheet, SMA6F30A-M3/I pinout, SMA6F30A-M3/I application, or SMA6F30A-M3/I equivalent, this device is selected for robust overvoltage protection in space-constrained consumer, industrial, and telecom systems where low-profile mounting, automated assembly, and high-energy surge handling are critical.

Technical Context

This TVS diode operates as a unidirectional Zener-clamp device with sharp avalanche breakdown behavior. Its electrical response is defined by VWM = 30 V, VBR min/max = 33.3 V / 36.8 V at IT = 1 mA, and VC = 48.4 V at IPP = 12.4 A under 10/1000 μs waveform - indicating fast transient suppression with low dynamic impedance (RD = 0.935 Ω).

Thermal performance is characterized by RθJA = 120–150 °C/W (FR4 PCB, 2 oz.), TJ max = 175 °C, and PD = 8 W at TM = 55 °C. The M3 suffix confirms halogen-free, RoHS-compliant construction, JESD201 class 2 whisker resistance, and MSL level 1 moisture sensitivity.

Key Specifications

Pinout & Package

SlimSMA (DO-221AC) surface-mount package with cathode indicated by color band; terminals are matte tin-plated for solderability per J-STD-002 and JESD22-B102.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMA6F30AHE3/52, SMA6F30A-M3/I offers identical protection performance with optimized logistics for large-batch manufacturing; versus SMBJ30A, it delivers 35% lower profile and 37% better thermal resistance on FR4, enabling denser, cooler-running designs.

Availability

SMA6F30A-M3/I is available at Aetrix Electronics and suitable for USB power delivery systems, industrial sensor interfaces, telecom line cards, and automotive infotainment modules requiring stable component supply and long-term obsolescence management.

Supply support for SMA6F30A-M3/I 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

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.

The SMA6F series is engineered for high-energy transient suppression in compact surface-mount formats, targeting design-in across consumer, industrial, and communications infrastructure where space, surge margin, and manufacturability are critical.

FAQ

What is the maximum clamping voltage of SMA6F30A-M3/I under a 10/1000 μs surge?

The SMA6F30A-M3/I has a maximum clamping voltage (VC) of 48.4 V at 12.4 A under the standard 10/1000 μs waveform. This value is measured per the manufacturer's test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping performance remains consistent across its rated operating temperature range (−55 °C to +175 °C), making SMA6F30A-M3/I suitable for demanding thermal environments.

Does SMA6F30A-M3/I support lead-free reflow soldering?

Yes, SMA6F30A-M3/I meets J-STD-020 MSL level 1 with a maximum lead-free reflow peak temperature of 260 °C, eliminating the need for pre-baking or special handling. Its matte tin-plated terminals comply with J-STD-002 and JESD22-B102 for reliable wetting and joint formation. The M3 suffix further certifies halogen-free, RoHS-compliant materials - confirming full compatibility with modern lead-free manufacturing processes used for SMA6F30A-M3/I.

How does the SlimSMA (DO-221AC) package of SMA6F30A-M3/I compare to SMB in size and thermal performance?

The SlimSMA (DO-221AC) package of SMA6F30A-M3/I measures 4.35 mm × 2.70 mm × 0.95 mm, offering a 60% lower profile than the SMB (DO-214AA) package (4.57 mm × 3.94 mm × 2.40 mm). Thermally, SMA6F30A-M3/I achieves RθJA = 120–150 °C/W on FR4, significantly better than SMBJ30A's ~190 °C/W - enabling higher power dissipation in constrained spaces. These advantages make SMA6F30A-M3/I preferable where board height and thermal density are limiting factors.

Is SMA6F30A-M3/I suitable for bidirectional transient protection?

No, SMA6F30A-M3/I is strictly unidirectional and must not be used in AC-coupled or bipolar signal paths. Its design provides clamping only for positive transients relative to cathode; reverse polarity events will not trigger protection. For bidirectional applications such as RS-485 or Ethernet data lines, a dedicated bidirectional TVS like SMA6F30AY-M3/I (if available) or dual-diode configuration is required. Using SMA6F30A-M3/I in bidirectional roles risks unprotected failure.

What is the leakage current specification for SMA6F30A-M3/I at its stand-off voltage?

SMA6F30A-M3/I exhibits a maximum reverse leakage current (ID) of 0.2 μA at its 30 V stand-off voltage (VWM) and TA = 25 °C. This ultra-low leakage ensures minimal power drain in always-on circuits and prevents false triggering in high-impedance sensing nodes. Leakage remains below 1.0 μA across the full operating temperature range (−55 °C to +175 °C), preserving system efficiency and measurement accuracy in battery-powered and precision analog applications using SMA6F30A-M3/I.