Taiwan Semiconductor Corporation MUR340S R7G

Overview

MUR340S R7G from Taiwan Semiconductor is a 3A, 400V ultra-fast recovery surface-mount rectifier in DO-214AB (SMC) package, featuring 50 ns reverse recovery time, 1.25 V forward voltage at 3A/25°C, and 75 A peak surge current-designed for high-frequency freewheeling and switching-mode power supplies in telecom and computing infrastructure.

For engineers reviewing the MUR340S R7G datasheet, MUR340S R7G pinout, MUR340S R7G application, or MUR340S R7G equivalent, key selection criteria include its 400 V repetitive peak reverse voltage, 175 °C maximum junction temperature, ultra-fast 50 ns recovery, RoHS/halogen-free compliance, and suitability for space-constrained SMT layouts requiring low forward loss and thermal robustness.

Technical Context

This single-die, glass-passivated silicon rectifier operates with a cathode-band polarity indicator and supports continuous forward current up to 3 A at 175 °C junction temperature. Its 11 °C/W junction-to-lead thermal resistance enables efficient heat transfer to PCB copper in high-density power stages.

The device delivers 1.05 V forward voltage at 3 A and 150 °C, enabling stable conduction under elevated thermal stress. Reverse leakage remains ≤250 μA at 150 °C and rated 400 V, supporting reliable blocking in SMPS secondary-side rectification and flyback snubber circuits.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount molded plastic case with matte tin-plated leads, UL 94V-0 rated, moisture sensitivity level 1, and cathode polarity indicated by a band.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-fast rectifier applications.

Compared with STTH3L04S and ES3D-E3/57T, the MUR340S R7G offers optimal balance of 400 V blocking, 50 ns speed, and 1.25 V forward drop in DO-214AB-making it the preferred choice for 48 V–380 V telecom and server power designs where voltage margin and thermal robustness are critical.

Availability

MUR340S R7G is available at Aetrix Electronics and suitable for server power supply rectification, telecom DC-DC converter output stages, and industrial motor drive snubber circuits requiring stable component supply and long-term manufacturability.

Supply support for MUR340S R7G 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and power discrete manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and communications markets since 1979.

The MUR340S R7G belongs to TSC's MUR3xS ultra-fast rectifier family, engineered specifically for high-efficiency, high-frequency AC-DC and DC-DC conversion where fast recovery, low VF, and rugged thermal performance are essential.

FAQ

What is the maximum junction temperature rating for the MUR340S R7G?

The MUR340S R7G has a maximum junction temperature (TJ max) of 175 °C, allowing reliable operation in high-ambient environments such as enclosed server power supplies and industrial motor drives. This rating is validated per JEDEC test conditions and supports continuous 3 A forward current when thermal design maintains junction temperature within limit. The MUR340S R7G's 11 °C/W junction-to-lead thermal resistance further enables effective heat transfer to PCB copper or heatsinks.

Does the MUR340S R7G have RoHS and halogen-free compliance?

Yes, the MUR340S R7G is RoHS compliant and halogen-free per IEC 61249-2-21. It uses green molding compound and matte tin-plated leads that meet J-STD-002 solderability standards. These environmental qualifications are verified in Taiwan Semiconductor's official documentation and supported by material declarations available upon request. The MUR340S R7G meets both regulatory and reliability requirements for commercial telecom and computing equipment.

What is the reverse recovery time (trr) specification for the MUR340S R7G?

The MUR340S R7G has a typical reverse recovery time (trr) of 50 ns, measured at IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. This ultra-fast recovery characteristic reduces switching losses and EMI in high-frequency power converters operating above 100 kHz. The MUR340S R7G's trr is consistent across its rated temperature range and is a key differentiator versus standard recovery rectifiers in SMC packages.

Is the MUR340S R7G suitable for use in flyback converter freewheeling applications?

Yes, the MUR340S R7G is explicitly designed for freewheeling applications in switching-mode converters including flyback topologies. Its 400 V VRRM provides margin against reflected voltage spikes, 50 ns trr minimizes energy loss during diode commutation, and 1.25 V VF at 3 A ensures low conduction loss. The MUR340S R7G's DO-214AB package also supports robust mechanical mounting and thermal coupling in compact adapter designs.

What packaging and reel quantity is used for the MUR340S R7G?

The MUR340S R7G is supplied in DO-214AB (SMC) package on tape-and-reel format, with 3,000 units per reel. This packaging supports automated SMT assembly and complies with J-STD-020 moisture sensitivity level 1, eliminating bake requirements prior to reflow. The marking code "MUR340S" is laser-etched on the cathode-banded surface, and the "R7G" suffix denotes Taiwan Semiconductor's standard green-compliant variant.