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Diodes Incorporated MUR140-T
- Part No.:
- MUR140-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
MUR140-T.pdf
- Description:
- DIODE GEN PURP 400V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:4,500
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Product details
Overview
MUR140-T from Diodes Incorporated is a 1.0A, 400V peak repetitive reverse voltage super-fast recovery rectifier diode in DO-41 package, featuring 50 ns reverse recovery time (trr), 1.25 V forward voltage at 1.0A/25°C, and 35A non-repetitive surge current rating; used in high-frequency switching power supplies and DC-DC converters for efficient AC-to-DC conversion.
For engineers reviewing the MUR140-T datasheet, MUR140-T pinout, MUR140-T application, or MUR140-T equivalent, key selection criteria include trr ≤ 75 ns, VRRM = 400 V, IO = 1.0 A at TT = 120°C, thermal resistance RJA = 72 K/W, and DO-41 mechanical compatibility with automated tape-and-reel assembly.
Technical Context
This super-fast rectifier employs glass-passivated junction construction to achieve low reverse recovery charge and minimal switching losses in high-frequency operation. Its 50 ns trr (measured at IF = 0.5A, IR = 1.0A, Irr = 0.25A) enables use in SMPS operating up to several hundred kHz.
The device supports single-phase, half-wave rectification at 60 Hz with resistive or inductive loads, and requires 20% average current derating under capacitive load conditions. Junction temperature range spans –65°C to +175°C, supporting harsh-environment deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum peak reverse voltage the diode blocks without breakdown; defines safe AC input voltage headroom in bridge or flyback designs. |
| IO @ TT=120°C | 1.0 A - Continuous average forward current rating at terminal temperature of 120°C; sets minimum heatsinking requirement for steady-state operation. |
| trr (Note 2) | 50 ns - Measured reverse recovery time under defined di/dt and current transition; directly impacts switching loss and EMI in high-frequency converters. |
| VFM @ 1.0A/25°C | 1.25 V - Forward voltage drop at rated DC current and room temperature; determines conduction loss and thermal dissipation in rectifier stage. |
| IFSM (8.3ms) | 35 A - Non-repetitive surge current capability; allows tolerance of line transients and startup inrush without failure. |
| Cj @ 0V | 45 pF - Junction capacitance at zero bias; affects high-frequency impedance and snubber design in resonant topologies. |
Pinout & Package
Package: DO-41 molded plastic case, UL 94V-0 rated, cathode indicated by band, lead finish bright tin, weight ≈ 0.35 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to AC source or transformer secondary; must withstand peak inverse voltage during off-state. |
| Cathode | Forward current exit point | Connected to output filter capacitor or load; marked with band; polarity critical for correct rectification. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Enhances reliability and moisture resistance; eliminates need for hermetic sealing in industrial-grade applications. |
| Super-fast recovery (50 ns) | Reduces reverse recovery loss and associated ringing, enabling higher switching frequencies than standard fast rectifiers. |
| Low forward voltage (1.25 V) | Lowers conduction loss at 1A, improving efficiency and easing thermal management in compact power supplies. |
| 35A surge rating | Withstands short-duration overcurrent events such as cold-start surges or line spikes without degradation. |
Applications
| Switch-Mode Power Supply (SMPS) | DC-DC Converter Output Stage |
|---|---|
Use Scenario: Secondary-side rectification in 100–500 kHz flyback or forward converters. IC Role / Device Role / Timing Role: Unidirectional current steering element converting high-frequency AC to regulated DC. Use Value: 50 ns trr minimizes switching loss and improves efficiency over standard fast rectifiers like UF4007. | Use Scenario: Synchronous or asynchronous rectification in isolated/non-isolated buck-derived topologies. IC Role / Device Role / Timing Role: High-speed freewheeling path during low-side switch off-time. Use Value: 1.25 V VFM at 1A reduces conduction loss relative to Schottky alternatives above 40V blocking. |
| AC-DC Adapter Front End | Industrial Motor Drive Snubber Circuit |
Use Scenario: Input rectification in universal-input (90–264 VAC) wall adapters. IC Role / Device Role / Timing Role: Half-wave or full-wave rectifier in bridge configuration. Use Value: 400 V VRRM provides 2× safety margin over 264 VAC peak (373 V), ensuring long-term reliability. | Use Scenario: Clamp diode in IGBT snubber networks for 3-phase inverters. IC Role / Device Role / Timing Role: Fast turn-off path absorbing inductive energy during switching transitions. Use Value: 35A IFSM handles repetitive turn-off spikes; 72 K/W RJA supports mounting on shared heatsink with power devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UF4007-T | VRRM = 1000 V, trr = 75 ns, VFM = 1.7 V @ 1A | Higher voltage rating but slower recovery and higher conduction loss | Select when >400 V blocking is required; avoid where trr < 60 ns is critical. |
| STTH1R04DI-T | VRRM = 400 V, trr = 45 ns, VFM = 1.3 V @ 1A, DO-41 compatible | Nearly identical specs but tighter trr tolerance and slightly higher VFM | Drop-in replacement where sub-50 ns trr is prioritized; verify layout thermal coupling due to higher RJA (80 K/W). |
Compared with MUR140-T, UF4007-T trades speed for voltage headroom, while STTH1R04DI-T offers faster recovery at marginally higher conduction loss-both require validation of thermal performance in high-density layouts.
Availability
MUR140-T is available at Aetrix Electronics and suitable for switch-mode power supplies, AC-DC adapters, and industrial motor drive snubbers requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for SMT placement.
Supply support for MUR140-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in Taiwan and China.
The MUR series targets high-efficiency, high-frequency rectification in commercial and industrial power conversion, emphasizing speed, ruggedness, and manufacturability in standard packages like DO-41.
FAQ
What is the maximum junction temperature for MUR140-T?
The absolute maximum junction temperature is +175°C, with continuous operation supported from –65°C to +175°C. Derating begins at terminal temperature >120°C, where average forward current drops linearly to zero at 175°C per Figure 1 in the datasheet.
Is MUR140-T suitable for synchronous rectification?
No-MUR140-T is a unidirectional, passive silicon PN-junction rectifier. Synchronous rectification requires actively controlled MOSFETs with gate drive circuitry; this diode functions only as a freewheeling or output rectifier in asynchronous topologies.
Does MUR140-T meet lead-free and RoHS requirements?
Yes-MUR140-T features lead-free terminations with bright tin plating and complies with RoHS Directive 2011/65/EU, including exemptions for high-temperature solder and glass passivation per Annexes 5 and 7 of EU Directive 13.2.2003.
How does the DO-41 package affect thermal performance?
The DO-41 package has a junction-to-ambient thermal resistance of 72 K/W, meaning a 1.0A/1.25V (1.25W) dissipation yields ~90°C rise above ambient. Effective PCB copper area and airflow are essential to maintain TJ < 120°C in continuous operation.
MUR140-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 75 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 400 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
- Operating Temperature - Junction:
- -65°C ~ 175°C
MUR140-T FAQ
1.How can I place an order for MUR140-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MUR140-T 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 MUR140-T reliable?
The price and inventory of MUR140-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MUR140-T is usually 5 days.
3.What payment methods are accepted for MUR140-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MUR140-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MUR140-T?
MUR140-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MUR140-T 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 MUR140-T?
For technical support, including MUR140-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MUR140-T requirements.
6.How does Aetrix verify that MUR140-T is sourced from the original manufacturer or authorized distributors?
All MUR140-T 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 MUR140-T meets industry standards.
7.What is the process for return or replacement of MUR140-T?
All MUR140-T units undergo pre-shipment inspection (PSI). If there is an issue with MUR140-T, 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 MUR140-T part is unused and in its original packaging.
Return procedure for MUR140-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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