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Diodes Incorporated MURS140-13
- Part No.:
- MURS140-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
MURS140-13.pdf
- Description:
- DIODE GEN PURP 400V 1A SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,716
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Product details
Overview
MURS140-13 from Diodes Incorporated is a 1.0A surface-mount super-fast rectifier diode with 400V peak repetitive reverse voltage, 50ns reverse recovery time, and 1.25V forward voltage at 1.0A/25°C, designed for high-frequency switching power supplies, DC-DC converters, and freewheeling applications.
For engineers reviewing the MURS140-13 datasheet, MURS140-13 pinout, MURS140-13 application, or MURS140-13 equivalent, key selection criteria include its SMB package thermal resistance (13 K/W), glass-passivated die construction, surge rating of 35A (8.3ms half-sine), and suitability for automated SMT assembly with UL 94V-0 molded plastic case.
Technical Context
This super-fast rectifier employs a planar epitaxial silicon junction with glass passivation to achieve low trr (50 ns) and stable IRM (5.0 µA at 25°C), enabling efficient operation in high-frequency flyback and forward converter topologies where rapid turn-off minimizes switching losses.
Its thermal design relies on PCB copper pad heat sinking (5.0 mm², 0.013 mm thick), supporting 1.0A average output current at terminal temperature up to 150°C, with derating required for capacitive loads (–20% current rating).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum non-repetitive reverse voltage the diode withstands without breakdown during transient conditions. |
| IO @ TT=150°C | 1.0 A - Continuous average forward current sustainable with proper PCB thermal management at 150°C terminal temperature. |
| VFM @ 1.0A/25°C | 1.25 V - Forward conduction loss per diode at rated DC current, directly impacting efficiency in high-current paths. |
| trr | 50 ns - Time required for reverse recovery; critical for minimizing switching losses in >100 kHz SMPS designs. |
| IFSM | 35 A - Peak non-repetitive surge current capability (8.3 ms half-sine), supporting inrush and fault tolerance. |
| RJT | 13 K/W - Junction-to-terminal thermal resistance; defines temperature rise per watt dissipated under PCB pad heatsinking. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-banded polarity, UL 94V-0 molded plastic case, solderable terminals per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of load or switch node; must handle full IO and IFSM stress. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; connects to higher-potential rail; sustains full VRRM during off-state in buck/flyback outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enhances long-term reliability and moisture resistance in humid or thermally cycled environments. |
| Super-fast 50 ns trr | Reduces reverse recovery charge (Qrr), lowering EMI and conduction losses in high-frequency converters. |
| SMB package with 13 K/W RJT | Enables compact layout while maintaining thermal performance comparable to larger SMC packages. |
| 35A surge rating (JEDEC) | Supports robust operation during input line surges or output short-circuit events without failure. |
Applications
| AC-DC Adapter Secondary Rectification | DC-DC Converter Freewheeling Diode |
|---|---|
Use Scenario: Secondary-side rectification in 20–65W offline AC-DC adapters with 60–130 kHz flyback topology. IC Role / Device Role / Timing Role: Unidirectional current path converting transformer AC output to regulated DC; conducts during MOSFET off-time. Use Value: 50 ns trr minimizes switching loss and ringing, improving efficiency by ~0.8% vs. standard fast rectifiers at 100 kHz. | Use Scenario: Freewheeling path in synchronous-buck or boost converters powering FPGA core rails (1.2–3.3V). IC Role / Device Role / Timing Role: Provides low-loss current recirculation path when main switch turns off; blocks reverse voltage during on-time. Use Value: 1.25V VFM at 1A ensures <1.25W conduction loss at full load, reducing thermal load on compact PCB layouts. |
| Automotive LED Driver Output Stage | Industrial Sensor Power Supply Clamp |
Use Scenario: Output rectification in 12V-input LED drivers for cabin lighting with PWM dimming up to 2 kHz. IC Role / Device Role / Timing Role: Converts switched transformer output to stable DC for LED strings; handles repetitive 35A surge during cold-crank transients. Use Value: Glass passivation and –65°C to +175°C operating range ensure reliability across automotive temperature extremes. | Use Scenario: Reverse-polarity and transient clamp in 24V industrial sensor modules with ±2kV ESD immunity requirements. IC Role / Device Role / Timing Role: Acts as low-leakage (5 µA @ 25°C) blocking diode in supply rail protection circuitry. Use Value: 400V VRRM provides margin above 24V system transients (ISO 7637-2 Pulse 1/2), preventing latch-up during load dump. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R04U | Same SMB package, 400V VRRM, but trr = 35 ns and VFM = 1.30 V @ 1A/25°C. | Better recovery speed but higher forward loss; preferred in >200 kHz designs where Qrr dominates efficiency. | Select when trr < 40 ns is mandatory and thermal headroom allows higher VFM. |
| ES1D-E3/61T | Same SMB package, 200V VRRM, trr = 35 ns, VFM = 1.7 V @ 1A/25°C. | Limited to ≤200V systems; higher VFM increases conduction loss but offers faster recovery than MURS140-13. | Use only in low-voltage (<200V) high-frequency applications where 400V rating is unnecessary. |
Compared with STTH1R04U and ES1D-E3/61T, MURS140-13 delivers optimal balance of 400V rating, 50 ns trr, and 1.25V VFM for cost-sensitive 60–150 kHz power supplies requiring robust surge handling and wide temperature operation.
Availability
MURS140-13 is available at Aetrix Electronics and suitable for AC-DC adapters, DC-DC converters, and automotive LED drivers requiring stable component supply, consistent SMB packaging, and verified 175°C maximum junction temperature performance.
Supply support for MURS140-13 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, specializing in high-efficiency power management and signal integrity solutions for industrial, computing, and automotive markets.
The MURS series belongs to Diodes' super-fast rectifier product line, engineered specifically for high-frequency switching power conversion where low trr, stable VFM, and rugged surge capability are essential.
FAQ
What is the maximum allowable junction temperature for MURS140-13?
The absolute maximum junction temperature is +175°C, validated per JEDEC standards. Operation at this limit requires strict adherence to thermal design rules: 5.0 mm² copper pad heatsink, no airflow restriction, and derating IO to ≤0.6A at TT = 150°C per Figure 1 in DS30130 Rev. 5.
Can MURS140-13 replace a standard FR107 in a 65W laptop adapter?
Yes - MURS140-13 offers superior performance: 50 ns trr vs. FR107's 500 ns, reducing switching loss by ~35%, and 1.25V VFM vs. FR107's 1.3V. Its SMB footprint is compatible with FR107's DO-41 through-hole mount only with adapter board; direct SMT replacement requires layout revision.
Is MURS140-13 compliant with lead-free reflow profiles?
Yes - it meets J-STD-020D moisture sensitivity level 1 (MSL-1) and supports peak reflow temperatures up to 260°C for 10 seconds. The solder-plated terminals comply with IPC/JEDEC J-STD-006B and are qualified for Pb-free SAC305 alloy processes.
Does the cathode marking on MURS140-13 indicate polarity for PCB silkscreen alignment?
Yes - the cathode is marked with a distinct band on the black molded case, aligning with standard PCB silkscreen "K" or "CATH" indicators. Correct orientation is critical: anode must connect toward lower potential (e.g., transformer secondary center-tap or switch node), cathode toward output capacitor positive.
MURS140-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 5 µA @ 400 V
- Capacitance @ Vr, F:
- 10pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
- Operating Temperature - Junction:
- -55°C ~ 175°C
MURS140-13 FAQ
1.How can I place an order for MURS140-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for MURS140-13 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 MURS140-13 reliable?
The price and inventory of MURS140-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MURS140-13 is usually 5 days.
3.What payment methods are accepted for MURS140-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MURS140-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MURS140-13?
MURS140-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MURS140-13 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 MURS140-13?
For technical support, including MURS140-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MURS140-13 requirements.
6.How does Aetrix verify that MURS140-13 is sourced from the original manufacturer or authorized distributors?
All MURS140-13 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 MURS140-13 meets industry standards.
7.What is the process for return or replacement of MURS140-13?
All MURS140-13 units undergo pre-shipment inspection (PSI). If there is an issue with MURS140-13, 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 MURS140-13 part is unused and in its original packaging.
Return procedure for MURS140-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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