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Taiwan Semiconductor Corporation MUR305S
- Part No.:
- MUR305S
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
MUR305S.pdf
- Description:
- DIODE GEN PURP 50V 3A DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MUR305S from Taiwan Semiconductor is a 3A, 50V ultra-fast recovery surface-mount rectifier diode in DO-214AB (SMC) package, featuring 25ns reverse recovery time, 0.875V forward voltage at 3A/25°C, and 75A peak surge current - deployed in high-frequency switching mode power supplies for telecom and computing equipment.
For engineers reviewing the MUR305S datasheet, MUR305S pinout, MUR305S application, or MUR305S equivalent, key selection criteria include ultra-fast trr (25ns), low VF at rated current, thermal resistance (RθJL = 11°C/W), and DO-214AB mechanical compatibility with automated SMT assembly lines.
Technical Context
The MUR305S is a single-die, silicon planar epitaxial ultra-fast rectifier optimized for high-efficiency DC-DC conversion where rapid turn-off minimizes switching losses. Its glass-passivated junction ensures stable performance under thermal cycling and humidity stress.
Designed for operation up to 175°C junction temperature, it supports continuous conduction mode in SMPS outputs and freewheeling paths, with reverse leakage limited to 5μA at 25°C and 150μA at 150°C - critical for maintaining efficiency in high-temperature environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 50 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 50V-rated DC bus or output circuits |
| IF | 3 A - Continuous forward current rating; determines minimum trace width and heatsinking in PCB layout |
| trr | 25 ns - Ultra-fast reverse recovery time; enables >100 kHz switching frequencies with low dynamic loss |
| VF @ 3A, 25°C | 0.875 V - Forward voltage drop; directly impacts conduction loss and thermal design at full load |
| RθJL | 11 °C/W - Junction-to-lead thermal resistance; enables direct solder-pad thermal path without external heatsink |
| IFSM | 75 A - Non-repetitive surge rating; withstands inrush currents during power-up in SMPS applications |
| IR @ 25°C | 5 μA - Reverse leakage current; ensures minimal standby power loss in offline converters |
Pinout & Package
Package: DO-214AB (SMC) - surface-mount plastic case with matte tin-plated leads, UL 94V-0 rated molding compound, cathode indicated by band, weight ≈ 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., switch node or ground return) in freewheeling or output rectification |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; connects to positive output rail or higher-voltage node; blocks reverse voltage up to 50 V |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term reliability under humidity and thermal stress per J-STD-020 moisture level 1 |
| Ultra-fast 25 ns trr | Reduces switching loss and EMI in high-frequency SMPS (>100 kHz) compared to standard fast rectifiers |
| DO-214AB (SMC) package | Enables automated pick-and-place assembly and provides robust thermal conduction via leadframe |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and environmental requirements for commercial and industrial end equipment |
Applications
| Telecom AC-DC Adapters | Server VRM Output Rectification |
|---|---|
Use Scenario: Secondary-side rectification in 50–100W isolated flyback adapters powering telecom line cards. IC Role / Device Role / Timing Role: Ultra-fast output rectifier replacing slower FR-type diodes to improve efficiency and reduce heat buildup. Use Value: 25ns trr and 0.875V VF at 3A enable >90% efficiency at full load while maintaining compact footprint. | Use Scenario: Synchronous rectifier companion or standalone output diode in multiphase buck-derived VRMs for CPU/GPU power delivery. IC Role / Device Role / Timing Role: Freewheeling diode during low-side FET dead-time; handles reverse recovery energy with minimal ringing. Use Value: Low RθJL (11°C/W) and 175°C TJ max allow operation in thermally dense server PCBs without derating. |
| Industrial PLC Power Supplies | LED Driver Secondary Rectification |
Use Scenario: Input rectification in wide-input-range (85–305 VAC) industrial SMPS used in programmable logic controllers. IC Role / Device Role / Timing Role: Bridge or single-diode rectifier in PFC front-end or main DC bus generation stage. Use Value: 75A IFSM withstands cold-start surges; 150μA IR at 150°C ensures stability in enclosed, unventilated enclosures. | Use Scenario: Output rectification in constant-current LED drivers for street lighting and signage. IC Role / Device Role / Timing Role: High-reliability secondary-side diode handling continuous 3A DC output with minimal voltage drop. Use Value: Glass passivation and halogen-free construction meet long-life and environmental compliance requirements for outdoor lighting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH3L05S | Same 3A/50V rating; trr = 35 ns (vs. MUR305S's 25 ns); VF = 0.89 V at 3A/25°C | Slightly higher dynamic loss in >200 kHz designs; identical DO-214AB footprint | Select when prioritizing ST ecosystem support or legacy BOM continuity over minimal trr advantage |
| ON Semi MUR305E | Same electrical specs and DO-214AB package; RoHS-compliant but not explicitly halogen-free per IEC 61249-2-21 | Valid alternative where halogen-free requirement is not enforced | Choose for cross-supplier risk mitigation with identical performance and pinout |
Compared with STTH3L05S and MUR305E, the MUR305S delivers the shortest reverse recovery (25 ns) and certified halogen-free construction - making it optimal for high-density, high-frequency, and environmentally regulated designs where both speed and compliance are mandatory.
Availability
MUR305S is available at Aetrix Electronics and suitable for telecom adapters, server VRMs, industrial PLC power supplies, and LED driver secondary rectification requiring stable component supply across multi-year production cycles.
Supply support for MUR305S 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, serving global industrial, computing, and communications markets since 1979.
The MUR305S belongs to TSC's ultra-fast rectifier product line, engineered specifically for high-efficiency, high-frequency switching power conversion in space-constrained and thermally demanding applications.
FAQ
What is the maximum junction temperature rating for the MUR305S?
The MUR305S has a maximum junction temperature (TJ MAX) of +175°C, enabling reliable operation in high-ambient environments such as enclosed industrial power supplies or thermally dense server boards. This rating is validated under continuous forward current conditions and supports derating curves up to that limit - critical for thermal margin analysis in the MUR305S design-in phase.
Does the MUR305S have a specified reverse recovery time, and how is it measured?
Yes, the MUR305S specifies a typical reverse recovery time (trr) of 25 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per the datasheet. This value reflects actual switching behavior in high-frequency SMPS topologies and is essential for evaluating dynamic losses and EMI in the MUR305S application circuit.
Is the MUR305S compatible with lead-free reflow soldering processes?
Yes, the MUR305S features matte tin-plated leads compliant with J-STD-002 and is qualified for standard lead-free reflow profiles. Its DO-214AB (SMC) package meets JEDEC moisture sensitivity level 1, eliminating bake requirements prior to assembly - simplifying manufacturing integration for the MUR305S in high-volume SMT lines.
What is the forward voltage drop of the MUR305S at elevated temperature?
At 3 A and TJ = 150°C, the MUR305S exhibits a maximum forward voltage (VF) of 0.710 V - lower than its 25°C value due to negative temperature coefficient of silicon diodes. This characteristic improves thermal stability in the MUR305S when used in high-temperature ambient applications like enclosed LED drivers or industrial PSUs.
How does the MUR305S differ from higher-voltage variants like MUR310S or MUR320S?
The MUR305S is electrically optimized for 50 V VRRM operation, offering the lowest VF (0.875 V) and fastest trr (25 ns) within the MUR305S–MUR360S family. Higher-voltage variants trade speed and conduction loss for blocking capability - e.g., MUR320S has trr = 25 ns but VF = 0.95 V - so the MUR305S remains preferred where 50 V rating suffices and efficiency is paramount.
MUR305S Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AB, SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 50 V
- Current - Average Rectified (Io):
- 3A
- Voltage - Forward (Vf) (Max) @ If:
- -
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 25 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 50 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
- Operating Temperature - Junction:
- -55°C ~ 175°C
MUR305S FAQ
1.How can I place an order for MUR305S through Aetrix?
Please submit a Request for Quotation (RFQ) for MUR305S 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 MUR305S reliable?
The price and inventory of MUR305S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MUR305S is usually 5 days.
3.What payment methods are accepted for MUR305S?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MUR305S transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MUR305S?
MUR305S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MUR305S 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 MUR305S?
For technical support, including MUR305S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MUR305S requirements.
6.How does Aetrix verify that MUR305S is sourced from the original manufacturer or authorized distributors?
All MUR305S 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 MUR305S meets industry standards.
7.What is the process for return or replacement of MUR305S?
All MUR305S units undergo pre-shipment inspection (PSI). If there is an issue with MUR305S, 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 MUR305S part is unused and in its original packaging.
Return procedure for MUR305S:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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