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Taiwan Semiconductor Corporation MUR140S
- Part No.:
- MUR140S
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
MUR140S.pdf
- Description:
- DIODE GEN PURP 400V 1A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,940
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Product details
Overview
MUR140S from Taiwan Semiconductor is a 1 A, 400 V ultra-fast recovery surface-mount rectifier diode in DO-214AA (SMB) package, featuring 50 ns reverse recovery time, 1.25 V forward voltage at 1 A and 25°C, and 150 µA reverse leakage at 150°C - deployed in high-frequency switching power supplies for efficient AC/DC conversion.
For engineers reviewing the MUR140S datasheet, MUR140S pinout, MUR140S application, or MUR140S equivalent, key selection criteria include peak repetitive reverse voltage (400 V), surge current capability (35 A), junction-to-lead thermal resistance (17 °C/W), and RoHS/halogen-free compliance for industrial-grade power conversion designs.
Technical Context
The MUR140S is a single-die, planar passivated silicon PN junction rectifier optimized for high-frequency operation. Its ultra-fast recovery (trr = 50 ns) minimizes switching losses in SMPS topologies operating above 50 kHz, while the 400 V VRRM rating supports 280 V RMS input applications with safety margin.
Thermally, it sustains continuous operation up to 175°C junction temperature and delivers 1 A average forward current with derating above 75°C ambient. The DO-214AA (SMB) package enables automated placement and meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - supports 280 V RMS input lines with 1.43× safety margin for universal AC input SMPS |
| IF(AV) | 1 A - rated average forward current at TC = 75°C; usable up to 175°C TJ with thermal derating |
| trr | 50 ns - enables high-frequency switching (>100 kHz) with low reverse recovery loss in flyback/forward converters |
| VF @ 1A, 25°C | 1.25 V - contributes to <1.25 W conduction loss per diode at full load in 1 A output rails |
| IR @ 400 V, 150°C | 150 µA - ensures stable blocking under elevated temperature stress in enclosed power adapters |
| RθJL | 17 °C/W - allows direct PCB copper pour heatsinking without external heatsink for ≤1 W dissipation |
| IFSM (8.3 ms) | 35 A - withstands inrush surges during cold-start of offline power supplies |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode-indicating band; matte tin-plated leads compliant with J-STD-002 solderability and UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to transformer secondary or switch node; requires low-inductance layout to minimize ringing |
| Cathode | Forward current exit / reverse-blocking terminal | Marked by band; ties to output capacitor positive; critical for EMI filtering path integrity |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures long-term reliability and stable leakage performance across temperature and humidity stress |
| Ultra-fast 50 ns recovery | Reduces switching loss and EMI generation in high-frequency DC/DC and AC/DC converters |
| Moisture sensitivity level 1 | Eliminates bake requirement prior to reflow, enabling direct SMT assembly without process interruption |
| RoHS & halogen-free | Meets IEC 61249-2-21 and global environmental compliance mandates for consumer and industrial end equipment |
| Junction temp max 175°C | Supports operation in thermally constrained enclosures such as LED drivers and compact adapters |
Applications
| Switching Mode Power Supply (SMPS) | AC/DC Adapters |
|---|---|
Use Scenario: Primary-side or secondary-side rectification in 10–65 W offline flyback converters with universal AC input (85–265 VAC). IC Role / Device Role / Timing Role: Ultra-fast output rectifier replacing slower FR/UF diodes to reduce conduction + recovery losses. Use Value: Enables >88% efficiency at full load and lower output ripple due to reduced trr-induced tail current. | Use Scenario: Output rectification in wall-mounted USB-C PD adapters powering laptops and monitors. IC Role / Device Role / Timing Role: Secondary-side freewheeling diode handling 1–3 A DC output with tight thermal constraints. Use Value: Maintains stable 1.25 V VF over temperature, minimizing thermal runaway risk in sealed plastic housings. |
| LED Lighting Drivers | DC/DC Converter Outputs |
Use Scenario: Constant-current rectification in isolated LED drivers for commercial downlights and streetlights. IC Role / Device Role / Timing Role: High-reliability output rectifier exposed to ambient temperatures up to 85°C ambient. Use Value: 150 µA IR at 150°C prevents excessive standby power loss and maintains lumen consistency over lifetime. | Use Scenario: Synchronous rectifier replacement in non-isolated buck-derived DC/DC modules for FPGA or ASIC core rails. IC Role / Device Role / Timing Role: Fast-recovery freewheeling diode in 12 V → 3.3 V/1 A point-of-load stages. Use Value: 50 ns trr limits voltage overshoot during switch transitions, easing output capacitor selection and reducing snubber losses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R04 | Same 1 A / 400 V rating; trr = 35 ns (faster), VF = 1.3 V (higher), DO-214AA package | Better suited for >200 kHz designs where recovery speed dominates conduction loss | Prefer STTH1R04 when minimizing EMI in high-frequency PFC or resonant converters |
| ES1D | 1 A / 200 V rating; trr = 35 ns; VF = 1.7 V; same DO-214AA footprint but lower VRRM | Limited to 140 V RMS input systems; unsuitable for universal AC input | Select ES1D only for cost-sensitive, low-input-voltage (<200 VDC) DC/DC applications |
Compared with STTH1R04 and ES1D, the MUR140S offers optimal balance of 400 V robustness, 50 ns recovery, and 1.25 V VF for mainstream 50–150 kHz SMPS - making it preferred for universal-input adapters and industrial power modules where voltage margin and thermal stability outweigh marginal speed gains.
Availability
MUR140S is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, LED lighting drivers, and DC/DC converter outputs requiring stable component supply, consistent parametric performance, and full traceability across production lots.
Supply support for MUR140S 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, specializing in power rectifiers, TVS diodes, MOSFETs, and bipolar transistors since 1979.
The MUR140S belongs to TSC's MURxS ultra-fast rectifier family, engineered specifically for high-efficiency, high-reliability AC/DC and DC/DC power conversion in consumer, industrial, and lighting applications.
FAQ
What is the maximum repetitive peak reverse voltage (VRRM) of the MUR140S?
The MUR140S has a maximum repetitive peak reverse voltage (VRRM) of 400 V, verified per Taiwan Semiconductor's L2102 datasheet. This rating allows safe operation with 280 V RMS input voltage and provides design margin against line transients in universal AC input power supplies. The MUR140S must not be operated beyond this voltage to ensure reliable blocking performance.
What is the forward voltage drop (VF) of the MUR140S at 1 A and 25°C?
The forward voltage drop (VF) of the MUR140S is 1.25 V at 1 A and 25°C, as specified in the electrical characteristics table of the official datasheet. At 150°C junction temperature, VF drops to 1.05 V due to semiconductor physics - a behavior confirmed in thermal test data. This VF directly impacts conduction loss calculation in the MUR140S application.
Does the MUR140S have a defined reverse recovery time (trr), and what is its value?
Yes, the MUR140S has a specified reverse recovery time (trr) of 50 ns under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A test conditions. This value is measured per JEDEC standards and is critical for evaluating switching loss and EMI in high-frequency power converters using the MUR140S as an output rectifier.
What package type does the MUR140S use, and is it compatible with standard SMT processes?
The MUR140S uses the DO-214AA (SMB) surface-mount package, with matte tin-plated leads that meet J-STD-002 solderability requirements. It is fully compatible with standard reflow profiles and classified as moisture sensitivity level 1 (MSL-1), meaning no pre-bake is required before assembly - a key advantage for high-volume manufacturing of products using the MUR140S.
What is the maximum junction temperature (TJ) rating for the MUR140S?
The MUR140S is rated for a maximum junction temperature (TJ) of +175°C, with a corresponding storage temperature range of −55°C to +175°C. This high TJ rating enables reliable operation in thermally demanding environments such as enclosed LED drivers or compact AC/DC adapters where the MUR140S may experience elevated case temperatures.
MUR140S Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- 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):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 150 µA @ 400 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 175°C
MUR140S FAQ
1.How can I place an order for MUR140S through Aetrix?
Please submit a Request for Quotation (RFQ) for MUR140S 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 MUR140S reliable?
The price and inventory of MUR140S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MUR140S is usually 5 days.
3.What payment methods are accepted for MUR140S?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MUR140S transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MUR140S?
MUR140S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MUR140S 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 MUR140S?
For technical support, including MUR140S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MUR140S requirements.
6.How does Aetrix verify that MUR140S is sourced from the original manufacturer or authorized distributors?
All MUR140S 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 MUR140S meets industry standards.
7.What is the process for return or replacement of MUR140S?
All MUR140S units undergo pre-shipment inspection (PSI). If there is an issue with MUR140S, 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 MUR140S part is unused and in its original packaging.
Return procedure for MUR140S:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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