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SMC Diode Solutions MURS320
- Part No.:
- MURS320
- Manufacturer:
- SMC Diode Solutions
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
MURS320.pdf
- Description:
- DIODE GEN PURP 200V 3A SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
MURS320 from Diodes Incorporated is a 3.0A, 200V surface-mount super-fast rectifier diode in SMC package, featuring 25ns reverse recovery time, 0.875V forward voltage at 3.0A/25°C, and 75A non-repetitive surge rating - deployed in high-frequency switch-mode power supplies for output rectification.
For engineers reviewing the MURS320 datasheet, MURS320 pinout, MURS320 application, or MURS320 equivalent, key selection criteria include fast recovery (trr = 25 ns), thermal resistance (RθJL = 11 °C/W), peak repetitive reverse voltage (200 V), average forward current (3.0 A at TL = 140°C), and RoHS-compliant lead-free plating.
Technical Context
This super-fast rectifier uses glass-passivated die construction to achieve stable junction behavior under transient stress and high-temperature operation up to +175°C. Its 25 ns reverse recovery time and low 45 pF junction capacitance enable efficient operation in 100–500 kHz SMPS topologies.
The device supports automated SMT assembly with SMC package footprint and matte tin-plated terminals compliant with MIL-STD-202 solderability. Polarity is marked by cathode band, and moisture sensitivity is rated Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for DC blocking in offline or DC-DC output stages. |
| IO | 3.0 A @ TL = 140°C - Continuous average forward current capability with PCB copper pad heatsinking; defines usable output power envelope. |
| trr | 25 ns - Reverse recovery time measured at IF = 0.5A, IR = 1.0A; enables high-frequency switching with low commutation loss. |
| VFM | 0.875 V @ 3.0A, 25°C - Forward voltage drop determining conduction loss and thermal rise in rectifier path. |
| RθJL | 11 °C/W - Junction-to-lead thermal resistance with 5.0 mm² copper pad; critical for estimating junction temperature rise under load. |
| CT | 45 pF @ 1 MHz, 0 V - Junction capacitance affecting high-frequency noise coupling and snubber design in flyback or LLC converters. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with UL 94V-0 flammability rating, 0.21 g weight, and cathode polarity indicated by band or notch on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry terminal | Connected to transformer secondary or switching node; must withstand peak surge currents up to 75A. |
| Cathode | Forward current exit / reverse-blocking terminal | Marked with band; ties to output filter capacitor or common rail; holds off 200V continuously. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated die | Enhances long-term reliability and humidity resistance without hermetic sealing; suitable for industrial ambient conditions. |
| Super-fast recovery (25 ns) | Reduces switching losses and EMI generation in high-frequency SMPS, enabling higher efficiency than standard fast rectifiers. |
| 75A surge rating (8.3 ms) | Withstands inrush and fault transients in AC-DC front ends and motor drive clamp circuits without failure. |
| Lead-free & halogen-free | Meets RoHS Directive 2002/95/EC and JEDEC green compound requirements; compatible with lead-free reflow profiles. |
Applications
| AC-DC Adapter Output Rectification | DC-DC Converter Secondary Side |
|---|---|
Use Scenario: 12–24 V output stage of universal-input 65 W laptop adapter operating at 100–130 kHz. IC Role / Device Role / Timing Role: Output rectifier converting high-frequency transformer secondary AC to regulated DC; conducts during positive half-cycle only. Use Value: 25 ns trr minimizes reverse recovery loss, improving full-load efficiency by ~0.8% versus standard FRD alternatives. | Use Scenario: Isolated 5 V/3 A auxiliary rail in telecom power module using active-clamp forward topology. IC Role / Device Role / Timing Role: Synchronous rectifier replacement where gate drive complexity is avoided; handles 3 A average current with low VFM. Use Value: 0.875 V VFM at 3 A reduces conduction loss vs. Schottky diodes above 20 V, extending thermal margin at 150°C junction. |
| LED Driver Secondary Rectification | Industrial PLC Power Supply Input Stage |
Use Scenario: Constant-current LED driver for street lighting with 36 V output and 100 kHz flyback control. IC Role / Device Role / Timing Role: High-efficiency output rectifier handling pulsed 2.5 A load; operates with minimal capacitive ringing due to low CT. Use Value: 45 pF junction capacitance suppresses high-frequency oscillation during turn-off, easing EMI filter design. | Use Scenario: 24 V input protection and rectification stage in DIN-rail mounted PLC power supply with wide ambient range. IC Role / Device Role / Timing Role: Input bridge leg component surviving 75A surge events from line transients and hot-swap insertion. Use Value: 75A IFSM rating ensures robustness against EN 61000-4-5 level 4 surges without derating or parallel 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 |
|---|---|---|---|
| STTH3L06S | Same 200 V VRRM, 3 A IO, but trr = 35 ns; RθJL = 13 °C/W; SMC package. | Higher recovery loss in >150 kHz designs; slightly lower thermal performance. | Acceptable where efficiency margin >1% is available or cost sensitivity outweighs speed advantage. |
| ON Semiconductor MURS320G | Identical electrical specs and SMC package; differs only in date-code marking and green compound compliance timeline. | No functional difference; qualifies as direct second-source for supply chain diversification. | Preferred when dual-sourcing is required without redesign or qualification retesting. |
Compared with STTH3L06S, MURS320 delivers lower switching loss via 10 ns faster recovery and better thermal dissipation; versus MURS320G, it shares identical performance but reflects earlier production batch compliance with halogen-free standards.
Availability
MURS320 is available at Aetrix Electronics and suitable for high-frequency switch-mode power supplies, LED drivers, and industrial PLC power stages requiring stable component supply, RoHS compliance, and surge-resilient rectification.
Supply support for MURS320 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, serving automotive, industrial, computing, and consumer markets with high-reliability components.
The MURS320 belongs to Diodes' Super-Fast Rectifier product line, engineered specifically for high-efficiency, high-frequency AC-DC and DC-DC conversion where low trr and controlled VFM are critical to system-level thermal and efficiency targets.
FAQ
What is the maximum junction temperature for continuous operation of MURS320?
The MURS320 has an operating junction temperature range of –65°C to +175°C. For reliable long-term operation at full 3.0 A average current, the terminal temperature must be maintained at ≤140°C, as defined in the forward current derating curve (Figure 1). Exceeding this requires thermal derating or enhanced heatsinking.
Is MURS320 suitable for use in synchronous rectification circuits?
No - MURS320 is a passive super-fast rectifier diode, not a MOSFET-based synchronous rectifier. It lacks gate control and cannot be actively driven. It serves as a freewheeling or output rectifier in non-synchronous topologies like flyback, forward, or half-bridge where simplicity and cost outweigh the ~2–3% efficiency gain of synchronous solutions.
How does the 45 pF junction capacitance affect circuit performance?
The 45 pF typical junction capacitance (measured at 1 MHz, 0 V) influences high-frequency switching behavior: it contributes to turn-off ringing and affects snubber sizing. In 100–500 kHz SMPS, this value is low enough to minimize EMI without excessive snubber loss, unlike slower rectifiers with >100 pF capacitance.
Can MURS320 replace a standard FR107 diode in an existing design?
Yes - MURS320 can directly replace FR107 in most cases: both are 1000 V PRV, 1 A rated, but MURS320 offers superior speed (trr = 25 ns vs. 500 ns), lower VFM (0.875 V vs. 1.7 V), and SMC surface-mount packaging. However, verify thermal layout compatibility, as MURS320's higher current rating may shift thermal stress points.
MURS320 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- SMC Diode Solutions
- Series:
- -
- Package/Case:
- DO-214AB, SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 3 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
- Operating Temperature - Junction:
- -65°C ~ 175°C
MURS320 FAQ
1.How can I place an order for MURS320 through Aetrix?
Please submit a Request for Quotation (RFQ) for MURS320 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 MURS320 reliable?
The price and inventory of MURS320 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MURS320 is usually 5 days.
3.What payment methods are accepted for MURS320?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MURS320 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MURS320?
MURS320 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MURS320 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 MURS320?
For technical support, including MURS320 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MURS320 requirements.
6.How does Aetrix verify that MURS320 is sourced from the original manufacturer or authorized distributors?
All MURS320 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 MURS320 meets industry standards.
7.What is the process for return or replacement of MURS320?
All MURS320 units undergo pre-shipment inspection (PSI). If there is an issue with MURS320, 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 MURS320 part is unused and in its original packaging.
Return procedure for MURS320:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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