Taiwan Semiconductor Corporation MUR440H

Overview

MUR440H from Taiwan Semiconductor is an AEC-Q101-qualified ultra-fast recovery rectifier diode rated for 4 A average forward current and 400 V repetitive peak reverse voltage, with 50 ns reverse recovery time and 1.28 V max forward voltage at 4 A and 25°C, used in automotive-grade DC-DC converters and switching inverters.

For engineers reviewing the MUR440H datasheet, MUR440H pinout, MUR440H application, or MUR440H equivalent, key selection criteria include its DO-201AD package, 125 A surge rating, 175°C max junction temperature, AEC-Q101 qualification status, and thermal resistance of 15°C/W (junction-to-lead).

Technical Context

The MUR440H employs a glass-passivated silicon junction optimized for high-frequency switching, delivering ultra-fast recovery (trr ≤ 50 ns) under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A test conditions. Its 400 V VRRM rating supports medium-voltage SMPS topologies requiring low conduction loss and minimal reverse recovery charge.

Thermally, it features R_θJL = 15°C/W and R_θJA = 28°C/W, enabling reliable operation up to 175°C junction temperature. The pure tin-plated leads meet J-STD-002 solderability and JESD201 Class 2 whisker resistance requirements.

Key Specifications

Pinout & Package

Package: DO-201AD axial-leaded through-hole package with cathode band marking, 1.20 g weight, UL 94V-0 molding compound, and pure tin-plated leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH4R04DJF and MUR440E, the MUR440H offers identical ultra-fast performance and AEC-Q101 qualification in DO-201AD, but with pure tin plating meeting J-STD-002 and JESD201 Class 2-critical for high-reliability automotive solder joints.

Availability

MUR440H is available at Aetrix Electronics and suitable for automotive power conversion, industrial motor drives, server ORing circuits, and renewable energy charge controllers requiring stable component supply and AEC-Q101 assurance.

Supply support for MUR440H 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 automotive, industrial, and computing markets since 1979.

The MUR440H belongs to TSC's MUR4xx ultra-fast rectifier family, engineered specifically for high-efficiency, high-reliability switching power supplies where fast recovery, high-temperature operation, and automotive qualification are mandatory.

FAQ

What is the maximum junction temperature rating for the MUR440H?

The MUR440H has a maximum junction temperature (T_J(max)) of +175°C, verified per AEC-Q101 stress testing. This rating allows uninterrupted operation in under-hood automotive environments and high-ambient industrial settings without thermal derating. The MUR440H maintains specified electrical parameters up to this limit, supported by its 15°C/W junction-to-lead thermal resistance.

Is the MUR440H pin-compatible with other DO-201AD rectifiers like MUR420 or MUR460?

Yes-the MUR440H shares the same DO-201AD package, axial lead configuration, and cathode-band polarity marking as MUR420 and MUR460. However, voltage ratings differ: MUR420 is 200 V, MUR440H is 400 V, and MUR460 is 600 V. Substituting MUR440H for MUR420 may over-specify voltage margin; substituting for MUR460 risks reverse breakdown. Always verify VRRM against circuit requirements before replacement.

Does the "H" suffix in MUR440H indicate AEC-Q101 qualification?

Yes-the "H" suffix explicitly denotes AEC-Q101 qualification per Taiwan Semiconductor's ordering nomenclature. The MUR440H undergoes full AEC-Q101 stress testing including high-temperature operating life (HTOL), temperature cycling (TC), high-temperature reverse bias (HTRB), and unbiased highly accelerated stress test (UHAST). This distinguishes it from non-H variants like MUR440, which lack automotive qualification.

What is the typical reverse recovery time (trr) of the MUR440H, and under what conditions is it measured?

The MUR440H has a maximum reverse recovery time (trr) of 50 ns, measured under standardized conditions: IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A, per JEDEC JESD282B.01. This ultra-fast trr enables efficient operation in switching power supplies above 100 kHz. The MUR440H achieves this via optimized carrier lifetime control in its glass-passivated silicon die.

Can the MUR440H replace a standard FR series fast rectifier in an existing design?

Yes-the MUR440H can replace standard FR-series rectifiers (e.g., FR404) in designs requiring faster recovery and higher temperature capability. Its 50 ns trr is ~4× faster than typical FR devices (~200 ns), reducing switching losses and EMI. However, confirm layout clearance for DO-201AD mechanical dimensions and verify that 400 V VRRM meets system transient requirements before substitution. The MUR440H also provides AEC-Q101 qualification unavailable in most FR parts.