Vishay General Semiconductor - Diodes Division 6DFN47A-M3/I

Overview

6DFN47A-M3/I from Vishay General Semiconductor is a unidirectional surface-mount TRANSZORB® transient voltage suppressor in DFN3820A package, with 47 V nominal breakdown voltage (V_BR), 40.2 V stand-off voltage (V_WM), 600 W peak pulse power (10/1000 μs), 9.3 A peak pulse current, and 64.8 V maximum clamping voltage (V_C). It protects MOSFETs and signal lines in industrial sensor units against lightning-induced transients.

For engineers reviewing the 6DFN47A-M3/I datasheet, 6DFN47A-M3/I pinout, 6DFN47A-M3/I application, or 6DFN47A-M3/I equivalent, key selection criteria include unidirectional polarity, MSL Level 1 moisture sensitivity, side-wettable flanks for AOI, 175 °C max junction temperature, and compatibility with SMP (DO-220AA) footprint.

Technical Context

This device uses passivated anisotropic rectifier technology to deliver stable clamping under repetitive surge conditions. Its low-profile DFN3820A package enables high-density PCB layouts while maintaining thermal resistance of 140–175 °C/W (junction-to-ambient) and 5–6.5 °C/W (junction-to-mount).

The 6DFN47A-M3/I operates across -65 °C to +175 °C, exhibits 0.092 %/°C temperature coefficient of V_BR, and meets IEC 61000-4-2 ESD immunity at ±30 kV (contact/air discharge). It is halogen-free, RoHS-compliant, and qualified to JESD 201 Class 2 whisker test.

Key Specifications

Pinout & Package

DFN3820A is a 2-terminal surface-mount package with cathode marked by color band; anode serves as heatsink. Dimensions: 3.95 mm × 2.18 mm × 0.88 mm (L × W × H), with side-wettable flanks for solder joint inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ48A and SMCJ48A, the 6DFN47A-M3/I delivers identical clamping performance in a 40 % smaller footprint with AOI-compatible side-wettable flanks and lower thermal resistance to mount, making it optimal for high-density industrial and medical PCBs where inspection reliability and thermal management are critical.

Availability

6DFN47A-M3/I is available at Aetrix Electronics and suitable for industrial sensor protection, automotive body control module inputs, and medical imaging signal chain applications requiring stable component supply, long-term lifecycle support, and consistent M3-grade environmental compliance.

Supply support for 6DFN47A-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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.

The 6DFNxxA series was designed specifically for high-density, automated manufacturing environments requiring AOI-ready TVS devices with industry-grade reliability, low profile, and precise clamping in consumer, industrial, and medical systems.

FAQ

What is the maximum clamping voltage of the 6DFN47A-M3/I under a 10/1000 μs surge?

The 6DFN47A-M3/I has a maximum clamping voltage (V_C) of 64.8 V when subjected to its rated peak pulse current (I_PPM = 9.3 A) under the standard 10/1000 μs waveform. This value is guaranteed per the manufacturer's datasheet (Document Number: 98464, Rev. 10-Nov-2023) and defines the upper voltage limit imposed on protected circuitry during surge events. The 6DFN47A-M3/I maintains this clamping performance across its full operating temperature range.

Is the 6DFN47A-M3/I compatible with lead-free reflow processes?

Yes, the 6DFN47A-M3/I is fully compatible with lead-free reflow processes. It meets JEDEC J-STD-020 MSL Level 1 specifications and supports a maximum peak reflow temperature of 260 °C. Its matte tin-plated terminals comply with J-STD-002 and JESD 22-B102 solderability standards, and the M3 suffix confirms qualification to JESD 201 Class 2 whisker testing. The 6DFN47A-M3/I is designed for standard Pb-free assembly without pre-baking.

Does the 6DFN47A-M3/I have bidirectional or unidirectional polarity?

The 6DFN47A-M3/I is a unidirectional transient voltage suppressor. Polarity is indicated by a color band marking the cathode end; the anode functions as the heatsink connection. This configuration is intended for DC line protection where reverse voltage is not expected. The 6DFN47A-M3/I does not provide symmetrical clamping for AC signals or bipolar transients - use a bidirectional variant only if explicitly required.

What is the thermal resistance from junction to ambient (R_θJA) for the 6DFN47A-M3/I?

The thermal resistance from junction to ambient (R_θJA) for the 6DFN47A-M3/I is specified as 140 °C/W (typical) and 175 °C/W (maximum), measured per JEDEC 51-2A on a standard FR4 PCB with 2 oz. copper. This value assumes the recommended mounting pad layout from the datasheet. Effective heat dissipation depends on PCB copper area and airflow; for high-repetition surge duty, thermal design must account for the 175 °C/W worst-case R_θJA to avoid exceeding the 175 °C T_J max limit.

How does the 6DFN47A-M3/I compare to the 6DFN43A-M3/I in terms of breakdown voltage and clamping performance?

The 6DFN47A-M3/I has a nominal breakdown voltage (V_BR) of 47.0 V (min 44.7 V, max 49.4 V), versus 43.0 V for the 6DFN43A-M3/I. Its clamping voltage (V_C) is 64.8 V at 9.3 A, compared to 59.3 V at 10.1 A for the 6DFN43A-M3/I. Both share identical package, power rating (600 W), and thermal specs. The 6DFN47A-M3/I is selected when system operating voltage approaches 40–42 V and tighter margin above V_WM = 40.2 V is required.