Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation MUR440

Name: MUR440
Brand: Taiwan Semiconductor Corporation
SKU: MUR440
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MUR440

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: MUR440.pdf

Description:: DIODE GEN PURP 400V 4A DO201AD

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,432

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MUR440 from Taiwan Semiconductor is a 4A, 400V ultra-fast recovery rectifier diode in DO-201AD package, featuring 50 ns reverse recovery time, 1.28 V forward voltage at 4A/25°C, and 125 A surge current capability; used in high-frequency switching mode power supplies for freewheeling and output rectification.

For engineers reviewing the MUR440 datasheet, MUR440 pinout, MUR440 application, or MUR440 equivalent, key selection criteria include V_RRM = 400 V, t_rr = 50 ns, I_F = 4 A, R_θJA = 28 °C/W, and DO-201AD mechanical compatibility with automated SMT or through-hole assembly.

Technical Context

The MUR440 operates as a single-die, unidirectional silicon rectifier optimized for high-frequency DC–DC conversion where fast switching minimizes switching losses. Its glass-passivated junction ensures stable performance up to 175 °C junction temperature and supports AEC-Q101 qualification when ordered with "H" suffix.

Designed for operation under repetitive peak reverse voltage of 400 V and RMS reverse voltage of 280 V, the device delivers low leakage (≤10 µA at 25 °C, ≤250 µA at 125 °C) and exhibits 65 pF junction capacitance at 1 MHz/4 V - critical for EMI-sensitive SMPS designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - maximum non-repetitive reverse blocking voltage; defines safe operating limit in flyback or boost converter output stage
t_rr	50 ns - ultra-fast recovery enables >100 kHz switching without excessive turn-off loss or voltage overshoot
V_F	1.28 V @ 4 A, 25 °C - forward drop directly impacts conduction loss and thermal design in 4 A continuous applications
I_FSM	125 A - peak surge rating supports inrush and transient overload in industrial power supplies
R_θJA	28 °C/W - thermal resistance from junction to ambient determines heatsinking requirement in enclosed or convection-cooled layouts
Junction Temp	−55 °C to +175 °C - extended range allows deployment in automotive under-hood or industrial motor drive environments

Pinout & Package

Package: DO-201AD - axial-leaded, molded plastic case with cathode band marking; RoHS-compliant, halogen-free, UL 94V-0 rated compound; pure tin-plated leads meet J-STD-002 solderability.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Current entry point during forward conduction	Connected to lower-potential node (e.g., switch node in buck converter); must handle full 4 A DC and 125 A surge
Cathode (Lead 2)	Current exit point; marked by band	Connected to higher-potential rail (e.g., output capacitor positive); reverse-biased during switching transitions

Key Features

Feature	Design Value
Ultra-fast recovery (50 ns)	Reduces switching loss and EMI generation in >100 kHz SMPS topologies compared to standard rectifiers
Glass-passivated junction	Enhances long-term reliability and moisture resistance in humid or thermally cycled environments
AEC-Q101 qualified option	Validated for automotive-grade stress testing (vibration, temperature cycling, HTRB), enabling use in ADAS power rails
DO-201AD mechanical standardization	Enables drop-in replacement across legacy 4 A rectifier families and simplifies board-level inventory management

Applications

DC–DC Converter Output Rectification	Switching Mode Inverter Freewheeling
Use Scenario: High-efficiency 48 V to 12 V isolated DC–DC module in telecom power shelf. IC Role / Device Role / Timing Role: Output rectifier conducting 4 A continuous current with minimal conduction and switching loss. Use Value: 50 ns t_rr and 1.28 V V_F reduce total power loss by ≥15% vs. standard FR107 in same layout.	Use Scenario: Bidirectional motor drive inverter with regenerative braking. IC Role / Device Role / Timing Role: Freewheeling diode clamping inductive kickback during PWM dead-time intervals. Use Value: Fast 50 ns recovery prevents cross-conduction risk and limits voltage spike amplitude to <450 V.
Industrial AC–DC Power Supply	Automotive On-Board Charger (OBC) Auxiliary Rail
Use Scenario: Secondary-side rectification in 300 W industrial AC–DC adapter. IC Role / Device Role / Timing Role: Main output rectifier handling 4 A average load at 100 kHz switching frequency. Use Value: 175 °C max junction temperature supports operation in sealed enclosures without forced air cooling.	Use Scenario: 12 V auxiliary supply in 6.6 kW OBC using AEC-Q101 qualified MUR440H variant. IC Role / Device Role / Timing Role: Isolated auxiliary rectifier supplying gate drivers and MCU bias rails. Use Value: Glass passivation and AEC-Q101 validation ensure >15-year field reliability under automotive thermal cycling.

DC–DC Converter Output Rectification

Switching Mode Inverter Freewheeling

Use Scenario: High-efficiency 48 V to 12 V isolated DC–DC module in telecom power shelf.

IC Role / Device Role / Timing Role: Output rectifier conducting 4 A continuous current with minimal conduction and switching loss.

Use Value: 50 ns t_rr and 1.28 V V_F reduce total power loss by ≥15% vs. standard FR107 in same layout.

Use Scenario: Bidirectional motor drive inverter with regenerative braking.

IC Role / Device Role / Timing Role: Freewheeling diode clamping inductive kickback during PWM dead-time intervals.

Use Value: Fast 50 ns recovery prevents cross-conduction risk and limits voltage spike amplitude to <450 V.

Industrial AC–DC Power Supply

Automotive On-Board Charger (OBC) Auxiliary Rail

Use Scenario: Secondary-side rectification in 300 W industrial AC–DC adapter.

IC Role / Device Role / Timing Role: Main output rectifier handling 4 A average load at 100 kHz switching frequency.

Use Value: 175 °C max junction temperature supports operation in sealed enclosures without forced air cooling.

Use Scenario: 12 V auxiliary supply in 6.6 kW OBC using AEC-Q101 qualified MUR440H variant.

IC Role / Device Role / Timing Role: Isolated auxiliary rectifier supplying gate drivers and MCU bias rails.

Use Value: Glass passivation and AEC-Q101 validation ensure >15-year field reliability under automotive thermal cycling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH4R04	V_RRM = 400 V, t_rr = 35 ns, V_F = 1.3 V @ 4 A - faster but slightly higher forward drop	Better suited for >200 kHz designs where t_rr dominates loss; less margin at high T_J	Select STTH4R04 when minimizing turn-off loss is prioritized over thermal derating margin
ES4D	V_RRM = 400 V, t_rr = 50 ns, V_F = 1.25 V @ 4 A - lower V_F, same t_rr, DO-201AD compatible	Lower conduction loss improves efficiency in thermally constrained 4 A applications	Choose ES4D when optimizing for low-temperature rise in compact PCB layouts

Compared with STTH4R04 and ES4D, the MUR440 offers balanced trade-offs: identical t_rr to ES4D but higher V_F, and slower t_rr than STTH4R04 but superior high-temperature leakage stability - making it ideal for cost-sensitive industrial power supplies requiring robust 175 °C operation.

Availability

MUR440 is available at Aetrix Electronics and suitable for DC–DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, long-lifecycle support, and DO-201AD footprint consistency.

Supply support for MUR440 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 MUR440 belongs to TSC's ultra-fast rectifier product line, engineered specifically for high-frequency switching power conversion where low recovery time, thermal robustness, and reliability under repetitive surge stress are essential.

FAQ

What is the maximum junction temperature rating for the MUR440?

The MUR440 has a maximum junction temperature (T_J) rating of +175 °C, verified per absolute maximum ratings table. This allows reliable operation in high-ambient environments such as enclosed industrial power supplies or under-hood automotive auxiliary circuits. The MUR440 maintains specified electrical parameters up to this limit when thermal design accounts for its R_θJA = 28 °C/W.

Does the MUR440 have AEC-Q101 qualification?

The base MUR440 is not AEC-Q101 qualified; however, the MUR440H variant - indicated by the "H" suffix in ordering code - is fully AEC-Q101 qualified. The MUR440H undergoes automotive-grade stress testing including temperature cycling, HTRB, and whisker resistance per JESD201 Class 2, making it suitable for automotive power modules.

What is the reverse recovery time (t_rr) of the MUR440 and how is it measured?

The MUR440 has a typical reverse recovery time (t_rr) of 50 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A per the manufacturer's test circuit (Fig.6). This value is confirmed in the Electrical Specifications table and applies across the full operating temperature range, supporting high-frequency SMPS designs up to 200 kHz.

Is the MUR440 compatible with lead-free reflow soldering processes?

Yes, the MUR440 features pure tin-plated leads compliant with J-STD-002 solderability requirements and rated for lead-free reflow profiles. Its DO-201AD package withstands peak temperatures up to 260 °C for 10 seconds, meeting IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) 1 classification when stored per specification.

What is the forward voltage (V_F) of the MUR440 at rated current and temperature?

The MUR440 exhibits a maximum forward voltage (V_F) of 1.28 V at I_F = 4 A and T_J = 25 °C, per the Electrical Specifications table. At elevated junction temperatures (e.g., 125 °C), V_F decreases slightly due to semiconductor physics, remaining within 1.15–1.22 V range - a key factor in thermal modeling of the MUR440 in continuous-duty applications.

MUR440 Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 4A

Voltage - Forward (Vf) (Max) @ If:: 1.28 V @ 4 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 400 V

Capacitance @ Vr, F:: 65pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

Operating Temperature - Junction:: -55°C ~ 175°C

MUR440 FAQ

1.How can I place an order for MUR440 through Aetrix?

Please submit a Request for Quotation (RFQ) for MUR440 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MUR440 reliable?

The price and inventory of MUR440 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MUR440 is usually 5 days.

3.What payment methods are accepted for MUR440?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MUR440 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MUR440?

MUR440 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MUR440 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MUR440?

For technical support, including MUR440 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MUR440 requirements.

6.How does Aetrix verify that MUR440 is sourced from the original manufacturer or authorized distributors?

All MUR440 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MUR440 meets industry standards.

7.What is the process for return or replacement of MUR440?

All MUR440 units undergo pre-shipment inspection (PSI). If there is an issue with MUR440, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MUR440 part is unused and in its original packaging.

Return procedure for MUR440:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…