Taiwan Semiconductor Corporation MUR820

Overview

MUR820 from Taiwan Semiconductor is an ultra-fast recovery rectifier diode in TO-220AC package, rated for 8 A average forward current and 200 V repetitive peak reverse voltage, with 25 ns reverse recovery time and 0.975 V max forward voltage at 8 A and 25°C - used in high-frequency DC/DC converters and switching inverters.

For engineers reviewing the MUR820 datasheet, MUR820 pinout, MUR820 application, or MUR820 equivalent, key selection criteria include ultra-fast trr (25 ns), low VF (≤0.975 V), AEC-Q101 qualification availability, thermal resistance (R_θJC = 3°C/W), and TO-220AC mounting compatibility.

Technical Context

The MUR820 employs a single-die, glass-passivated silicon junction optimized for high-speed switching in hard-commutated topologies. Its 25 ns reverse recovery time enables operation up to several hundred kHz without excessive switching loss.

Thermal performance is defined by R_θJC = 3°C/W and maximum junction temperature of 175°C, supporting continuous conduction mode in power supplies with moderate heatsinking. The device is unidirectional, single-anode–cathode configuration with polarity marked on case.

Key Specifications

Pinout & Package

Package: TO-220AC - three-terminal, through-hole, single-anode–cathode–case configuration; case is electrically connected to cathode; matte tin-plated leads; UL 94V-0 molding compound; mounting torque ≤0.56 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH8R06D, the MUR820 delivers lower conduction loss in 200 V systems; compared with MUR820G, it shares identical performance but differs in manufacturer-specific process and traceability - both support seamless design reuse without layout or thermal redesign.

Availability

MUR820 is available at Aetrix Electronics and suitable for DC/DC converters, switching inverters, and industrial SMPS requiring stable component supply with consistent TO-220AC mechanical fit and thermal performance.

Supply support for MUR820 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 industrial, computing, and automotive markets since 1979.

The MUR820 belongs to TSC's ultra-fast recovery rectifier family, engineered for high-efficiency, high-frequency power conversion where low VF and sub-50 ns trr are critical - targeting cost-sensitive yet thermally demanding applications.

FAQ

What is the maximum junction temperature rating for the MUR820?

The MUR820 has a maximum junction temperature (T_J) rating of +175°C, enabling reliable operation in enclosed industrial enclosures or under sustained thermal stress. This rating is supported by its glass-passivated die construction and 3°C/W junction-to-case thermal resistance. Derating curves in the datasheet confirm usable current capacity down to –55°C ambient. Thermal design must ensure case temperature remains within limits to avoid exceeding 175°C at the die.

Is the MUR820 pin-compatible with other TO-220AC rectifiers like the UF820 or STTH8R06D?

Yes, the MUR820 uses the standard TO-220AC outline with anode–cathode–case pinout, matching UF820 and STTH8R06D mechanically. However, electrical differences exist: UF820 has higher VF (~1.1 V) and slower trr (~50 ns); STTH8R06D offers 600 V VRRM but higher VF (1.7 V). Layout reuse is possible, but thermal and switching loss validation is required for each replacement.

Does the MUR820 have automotive qualification?

The base MUR820 is not AEC-Q101 qualified, but the MUR820H variant is explicitly qualified per AEC-Q101 Rev D for automotive applications. Both share identical electrical specs and TO-220AC packaging; only the 'H' suffix denotes qualification testing. For automotive designs requiring PPAP or reliability validation, MUR820H must be specified - MUR820 alone does not meet automotive stress test requirements.

What is the reverse recovery time (trr) specification for the MUR820, and how is it measured?

The MUR820 has a typical reverse recovery time (trr) of 25 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, I_RR = 0.25 A, and T_J = 25°C. This value reflects the time required for minority carriers to clear after forward conduction ceases. It directly impacts switching loss and EMI in high-frequency converters - lower trr reduces Q_rr and associated voltage overshoot during turn-off.

Can the MUR820 be used in freewheeling applications with inductive loads?

Yes, the MUR820 is specifically designed for freewheeling applications, as confirmed in its official Applications section. Its 100 A non-repetitive surge rating (IFSM) and 25 ns trr allow rapid current commutation during MOSFET/IGBT turn-off, suppressing voltage spikes across inductive loads. The TO-220AC case provides robust thermal dissipation during transient energy absorption - making MUR820 suitable for motor drives and solenoid controls.