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Diodes Incorporated MURS120
- Part No.:
- MURS120
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
MURS120.pdf
- Description:
- DIODE GEN PURP 200V 1A SMB TR 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,557
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Product details
Overview
MURS120 from Diodes Incorporated is a 1.0A surface-mount super-fast rectifier diode with 200V peak repetitive reverse voltage, 25ns reverse recovery time, and glass-passivated die construction-designed for high-frequency switching power supplies, DC-DC converters, and automotive auxiliary power rails where fast recovery and surge robustness are critical.
For engineers reviewing the MURS120 datasheet, MURS120 pinout, MURS120 application, or MURS120 equivalent, key selection criteria include its 40A non-repetitive surge rating, 0.875V forward voltage at 1.0A/25°C, SMB package thermal resistance of 15°C/W, and AEC-Q101 readiness for under-hood automotive use.
Technical Context
This discrete silicon planar epitaxial super-fast rectifier uses a PN junction optimized for low Qrr and minimal tail current, enabling efficient operation in 100–500kHz SMPS topologies. Its 25ns tRR and 27pF typical junction capacitance support reduced switching losses and EMI in compact power stages.
The device operates across –55°C to +175°C junction temperature, with thermal performance validated on 5.0mm² copper pads (RθJT = 15°C/W), and features cathode-band polarity marking and matte tin lead finish compliant with RoHS 3 and halogen-free "Green" standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Reverse Voltage | 200 V - supports 170VAC input rectification with safety margin |
| Forward Current (Avg) | 1.0 A - rated for continuous conduction in 12V/24V DC-DC output stages |
| Reverse Recovery Time | 25 ns - enables high-frequency operation without excessive switching loss |
| Forward Voltage | 0.875 V @ 1.0A/25°C - reduces conduction loss vs. standard FR diodes |
| Surge Current | 40 A (8.3ms) - withstands cold-start inrush and load-dump transients |
| Junction Temp Range | –55°C to +175°C - qualified for engine bay and industrial ambient environments |
| Thermal Resistance | 15 °C/W (Junction-to-Terminal) - requires minimal PCB copper area for thermal management |
Pinout & Package
Package: SMB (DO-214AA), surface-mount molded plastic case with UL 94V-0 rating, cathode band polarity marking, and matte tin-plated terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side (e.g., transformer secondary center-tap or switch node) |
| Cathode | Current exit terminal during forward conduction; marked with band/notch | Connected to output filter capacitor or positive rail; defines polarity in layout |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Enhances humidity resistance and long-term reliability in automotive under-hood environments |
| Super-fast 25ns recovery | Reduces reverse recovery charge (Qrr) and associated switching losses in high-frequency converters |
| 40A surge rating | Eliminates need for external surge clamping in 12V/24V battery-fed systems |
| AEC-Q101 readiness | Manufactured in IATF 16949 facilities with PPAP capability for automotive qualification programs |
Applications
| Automotive Body Control Module | Industrial DC-DC Converter |
|---|---|
Use Scenario: Rectifying switched 12V/24V inputs in BCM power distribution units with frequent load dumps. IC Role / Device Role / Timing Role: Output rectifier in synchronous buck-derived auxiliary supply. Use Value: 40A surge rating absorbs ISO 7637-2 Pulse 5a transients without derating or parallel devices. | Use Scenario: Secondary-side rectification in isolated 48V-to-12V telecom DC-DC modules operating at 300kHz. IC Role / Device Role / Timing Role: Fast-recovery freewheeling diode in active-clamp forward topology. Use Value: 25ns tRR minimizes dead-time losses and improves efficiency above 200kHz switching. |
| LED Driver Power Supply | Consumer AC-DC Adapter |
Use Scenario: Output rectification in constant-current LED drivers for outdoor signage with wide ambient temperature swings. IC Role / Device Role / Timing Role: Low-loss output diode in quasi-resonant flyback secondary stage. Use Value: 175°C max junction temperature enables operation in sealed enclosures without forced air cooling. | Use Scenario: Input bridge rectification in compact 5V/3A USB-C adapters with space-constrained SMB layout. IC Role / Device Role / Timing Role: High-density, low-profile rectifier replacing larger DO-41 or SMA packages. Use Value: SMB footprint saves >30% board area vs. SMA while maintaining 1.0A thermal rating via optimized RθJT. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1L06U | Same 200V VRRM, 1.0A IO, but 35ns tRR and higher VF (0.95V) | Higher conduction loss; less suitable for >250kHz designs | Select when cost sensitivity outweighs efficiency targets in <200kHz applications |
| ON Semi MUR120 | Identical electrical specs, but legacy DO-41 through-hole package | Requires wave-solder process and larger PCB real estate | Select only for legacy through-hole production or manual repair scenarios |
Compared with STTH1L06U and MUR120, the MURS120 delivers superior high-frequency efficiency due to its 25ns recovery and lower VF, while its SMB package enables automated SMT assembly and better thermal coupling to PCB copper than DO-41 alternatives.
Availability
MURS120 is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC-DC converters, LED driver power supplies, and consumer AC-DC adapters requiring stable component supply and AEC-Q101-aligned manufacturing traceability.
Supply support for MURS120 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-reliability power management, signal integrity, and protection solutions for automotive, industrial, and computing markets.
The MURS series belongs to Diodes' super-fast rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in space-constrained and thermally demanding applications.
FAQ
What is the maximum allowable PCB pad size for optimal thermal performance of MURS120?
The datasheet specifies thermal resistance validation using 5.0mm² (0.013mm thick) copper pads as heatsink. Increasing pad area beyond this provides diminishing returns; however, extending copper to ≥10mm² with thermal vias to inner ground planes can further reduce junction temperature by up to 15°C under full 1.0A load at +135°C ambient.
Does MURS120 meet AEC-Q101 requirements out-of-the-box?
MURS120 is manufactured in IATF 16949-certified facilities and supports PPAP documentation, but formal AEC-Q101 qualification requires customer-specific test plans and lot-level stress testing. Diodes provides AEC-Q101-ready data packages upon request for automotive program integration.
Can MURS120 replace standard FR107 diodes in existing designs?
Yes-MURS120 offers identical 1.0A/1000V ratings as FR107 but with significantly faster 25ns recovery (vs. 500ns) and lower VF. Layout compatibility is maintained since both use SMB packages; however, verify snubber network values due to reduced Qrr and faster switching edge rates.
Is the 27pF junction capacitance measured under reverse bias conditions?
Yes-the 27pF typical capacitance is measured at 1.0MHz with 4V DC reverse bias applied, per Note 6 in the datasheet. This value remains stable below 100V reverse voltage and directly impacts high-frequency ringing and EMI filter design in switching nodes.
MURS120 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 875 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 25 ns
- Current - Reverse Leakage @ Vr:
- 2 µA @ 200 V
- Capacitance @ Vr, F:
- 27pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
- Operating Temperature - Junction:
- -55°C ~ 150°C
MURS120 FAQ
1.How can I place an order for MURS120 through Aetrix?
Please submit a Request for Quotation (RFQ) for MURS120 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 MURS120 reliable?
The price and inventory of MURS120 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MURS120 is usually 5 days.
3.What payment methods are accepted for MURS120?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MURS120 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MURS120?
MURS120 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MURS120 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 MURS120?
For technical support, including MURS120 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MURS120 requirements.
6.How does Aetrix verify that MURS120 is sourced from the original manufacturer or authorized distributors?
All MURS120 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 MURS120 meets industry standards.
7.What is the process for return or replacement of MURS120?
All MURS120 units undergo pre-shipment inspection (PSI). If there is an issue with MURS120, 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 MURS120 part is unused and in its original packaging.
Return procedure for MURS120:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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