Taiwan Semiconductor Corporation MUR305S M6G

Overview

MUR305S from Taiwan Semiconductor is a 3A, 50V ultra-fast recovery surface-mount rectifier in DO-214AB (SMC) package, featuring 25ns reverse recovery time, 0.875V forward voltage at 3A/25°C, and 175°C maximum junction temperature. It serves as a freewheeling diode or output rectifier in high-frequency switching power supplies for telecom and computing equipment.

For engineers reviewing the MUR305S datasheet, MUR305S pinout, MUR305S application, or MUR305S equivalent, key selection criteria include its 50V V_RRM, ultra-fast trr of 25ns, low VF at elevated temperature, moisture sensitivity level 1 compliance, and DO-214AB mechanical compatibility with automated SMT assembly lines.

Technical Context

The MUR305S employs a glass-passivated silicon PN junction optimized for high-speed switching, enabling efficient operation in DC-DC converters and SMPS where rapid turn-off minimizes switching losses. Its thermal resistance R_θJL of 11°C/W supports reliable conduction at 3A continuous current with proper PCB copper heatsinking.

Designed for unidirectional current flow, it exhibits low leakage (≤5μA @ 25°C, ≤150μA @ 150°C) and withstands 75A non-repetitive surge current (8.3ms half-sine), making it suitable for transient-prone freewheeling paths in inductive load circuits.

Key Specifications

Pinout & Package

Package: DO-214AB (SMC), surface-mount plastic case with matte tin-plated leads, cathode indicated by band, weight ≈0.210g, UL 94V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH3L05S and ES3D, the MUR305S delivers the fastest reverse recovery (25ns), lowest forward voltage (0.875V), and highest surge capability (75A), making it optimal for thermally demanding, high-frequency switching applications where efficiency and reliability are prioritized over footprint size.

Availability

MUR305S is available at Aetrix Electronics and suitable for server power supplies, telecom DC-DC converters, and industrial PLC power input stages requiring stable component supply and consistent DO-214AB packaging.

Supply support for MUR305S 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 discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and telecom markets since 1979.

The MUR305S belongs to TSC's ultra-fast rectifier product line, engineered specifically for high-efficiency, high-frequency switching power conversion where low trr and stable VF across temperature are essential.

FAQ

What is the maximum junction temperature rating for the MUR305S?

The MUR305S has a maximum junction temperature (T_JMAX) of +175°C, allowing operation in high-ambient environments such as enclosed industrial enclosures or densely packed server power modules. This rating is validated per TSC's absolute maximum ratings table and supports derating curves up to 175°C with appropriate thermal design using the specified R_θJL of 11°C/W. The MUR305S maintains stable electrical performance within this range when mounted on adequate copper area.

Is the MUR305S compatible with lead-free reflow soldering processes?

Yes, the MUR305S features matte tin-plated leads compliant with J-STD-002 for solderability and is rated for lead-free reflow profiles including peak temperatures up to 260°C. Its moisture sensitivity level is rated at Level 1 per J-STD-020, meaning it can be stored indefinitely in dry pack and placed directly into reflow without baking. The MUR305S has been qualified for standard IPC/JEDEC industry reflow cycles.

What does the "S" suffix indicate in MUR305S?

The "S" suffix in MUR305S denotes surface-mount packaging in the DO-214AB (SMC) case, distinguishing it from through-hole variants. It confirms tape-and-reel packaging (3,000 units per reel), RoHS compliance, and halogen-free construction per IEC 61249-2-21. The MUR305S marking code appears as "MUR305S" on the device body alongside date and factory codes.

How does the reverse recovery time of the MUR305S compare to standard fast rectifiers?

The MUR305S achieves a typical reverse recovery time (t_rr) of 25ns under IF = 0.5A, IR = 1.0A, Irr = 0.25A conditions-approximately 2–3× faster than standard fast rectifiers (typically 50–100ns). This ultra-fast characteristic reduces switching loss and voltage overshoot in high-frequency converters. The MUR305S maintains this performance consistently across its operating temperature range, unlike many alternatives whose t_rr degrades significantly above 100°C.

Can the MUR305S be used in place of a Schottky diode in low-voltage applications?

No-the MUR305S is a PN junction ultra-fast rectifier with a forward voltage of 0.875V at 3A/25°C, whereas Schottky diodes typically offer 0.3–0.5V V_F at similar currents. While the MUR305S provides superior reverse voltage capability (50V vs. common 20–45V Schottky limits) and higher T_JMAX, its higher V_F makes it less efficient in sub-5V output applications. Use the MUR305S where 50V blocking, 25ns speed, and 175°C operation outweigh the need for lowest possible conduction loss.