My Inquiry
My Account
Taiwan Semiconductor Corporation MUR420S
- Part No.:
- MUR420S
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
MUR420S.pdf
- Description:
- DIODE GEN PURP 200V 4A DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,822
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MUR420S from Taiwan Semiconductor is a 4A, 200V ultra-fast recovery surface-mount rectifier diode in DO-214AB (SMC) package, featuring 25ns reverse recovery time, 0.875V max forward voltage at 4A/25°C, and 75A peak surge current - deployed in high-frequency switching mode power supplies for telecom and computing infrastructure.
For engineers reviewing the MUR420S datasheet, MUR420S pinout, MUR420S application, or MUR420S equivalent, key selection criteria include ultra-fast trr (25ns), low VF at elevated temperature (0.710V @ 4A/150°C), JESD201 Class 2 whisker resistance, and DO-214AB thermal performance (RθJA = 45°C/W).
Technical Context
The MUR420S uses a glass-passivated single-die silicon junction optimized for high-efficiency freewheeling and output rectification in DC-DC converters operating above 100kHz. Its 25ns reverse recovery time minimizes switching losses during turn-off transitions under hard-switched conditions.
Thermally, the device supports continuous operation up to TJ = 175°C with RθJC = 8.5°C/W and RθJA = 45°C/W, enabling compact PCB layouts in space-constrained SMC-mounted designs without forced airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF (Avg) | 4 A - Continuous forward current rating at TC = 110°C, defining maximum steady-state conduction capability |
| VRRM | 200 V - Maximum repetitive peak reverse voltage, sets safe blocking margin in 170VAC-derived DC bus applications |
| trr | 25 ns - Measured at IF = 0.5A, IR = 1.0A, Irr = 0.25A; enables >500kHz switching in SMPS without excessive diode switching loss |
| VF (max) | 0.875 V @ 4A/25°C - Low forward drop reduces conduction loss and thermal stress in high-current output stages |
| IFSM | 75 A - Non-repetitive surge rating for 8.3ms half-sine, supporting inrush and transient overload tolerance |
| RθJA | 45 °C/W - Junction-to-ambient thermal resistance on standard FR-4 PCB, used to calculate worst-case die temperature rise |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode-indicated by molded band; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., switch node in buck converter); polarity must align with schematic symbol |
| Cathode | Forward current exit / reverse blocking terminal | Marked by visible band; ties to positive output rail; withstands 200V reverse bias continuously |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term reliability under humidity and thermal cycling; eliminates need for conformal coating in industrial environments |
| Ultra-fast 25ns trr | Reduces reverse recovery charge (Qrr) and associated EMI in high-frequency converters, improving efficiency over standard fast rectifiers |
| J-STD-020 Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates bake requirements and simplifies SMT line handling |
| RoHS & halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS directives; supports green manufacturing and export compliance for global OEMs |
Applications
| Server PSU Output Rectification | Telecom DC-DC Converter Freewheeling |
|---|---|
Use Scenario: Secondary-side rectification in 48V-output, 500W server power supplies operating at 300–500kHz. IC Role / Device Role / Timing Role: Ultra-fast rectifier conducting forward current during synchronous FET off-time; blocks reverse voltage during FET on-time. Use Value: 25ns trr and 0.710V VF @ 150°C reduce switching and conduction losses, enabling >95% efficiency at full load. | Use Scenario: Freewheeling path in isolated 12V/24V telecom DC-DC modules with tight thermal constraints. IC Role / Device Role / Timing Role: Provides low-loss return path for inductor current during primary-side switch off-phase; handles 75A surge during startup. Use Value: RθJA = 45°C/W and 175°C TJ max allow operation without heatsink in sealed chassis with natural convection only. |
| Laptop Adapter Secondary Rectification | Industrial Motor Drive Snubber Network |
Use Scenario: Output rectification in compact 65W GaN-based laptop adapters requiring high power density. IC Role / Device Role / Timing Role: Fast-recovery diode placed across transformer secondary winding; conducts during flyback energy transfer. Use Value: 0.875V VF max at 25°C and 0.710V at 150°C minimize voltage drop and thermal rise in confined adapter enclosures. | Use Scenario: Clamp diode in RC snubber networks protecting IGBTs in 3-phase 400V industrial motor drives. IC Role / Device Role / Timing Role: Absorbs inductive kickback energy during IGBT turn-off; requires fast turn-on and minimal Qrr. Use Value: 25ns trr and low CJ (65pF) limit capacitive loading and ensure rapid clamping response without oscillation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH4L02 | Same 4A/200V rating; trr = 35ns (vs. 25ns), VF = 0.92V @ 4A/25°C; TO-220AC package | Through-hole mounting; higher thermal mass but larger footprint; less suitable for high-density SMT designs | Select when board-level rework or manual assembly is required; avoid if automated placement or space constraints apply |
| ON Semiconductor MUR420 | Identical electrical specs and DO-214AB package; same marking code "MUR420S" used interchangeably in legacy designs | No functional difference; minor process variation between Taiwan Semiconductor and ON Semi fab lines | Drop-in replacement where dual-sourcing is mandated; verify lot-level qualification per IPC-A-610 Class 2 |
Compared with STTH4L02 and ON Semi MUR420, the MUR420S delivers the fastest trr (25ns) in SMC package, enabling higher-frequency operation than STTH4L02, while offering identical form-fit-function to MUR420 with documented Taiwan Semiconductor process control for extended thermal cycling life.
Availability
MUR420S is available at Aetrix Electronics and suitable for server power supplies, telecom DC-DC converters, and industrial motor drive snubbers requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for MUR420S 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 industrial, computing, and telecom markets since 1979.
The MUR420S belongs to TSC's ultra-fast rectifier product line, engineered specifically for high-efficiency, high-frequency switching power conversion where low Qrr, tight VF consistency, and robust thermal performance are critical.
FAQ
What is the maximum junction temperature rating for the MUR420S?
The MUR420S has a maximum junction temperature (TJ max) of +175°C, verified per absolute maximum ratings table. This allows reliable operation in high-temperature environments such as enclosed server PSUs or industrial motor drives. Derating curves confirm usable current capacity down to TJ = 175°C, and the device maintains 0.710V VF at that temperature - a key design parameter for thermal modeling of the MUR420S in final systems.
Does the MUR420S have a specified reverse recovery charge (Qrr)?
The MUR420S datasheet does not publish Qrr directly, but provides trr = 25ns under defined test conditions (IF = 0.5A, IR = 1.0A, Irr = 0.25A). Qrr can be estimated using industry-standard methods from trr and di/dt, though design-critical applications should validate Qrr experimentally. The MUR420S' low trr and 65pF junction capacitance collectively indicate minimal stored charge - a key advantage over standard fast recovery diodes in the MUR420S family.
Is the MUR420S compatible with lead-free reflow profiles?
Yes, the MUR420S is qualified for lead-free reflow per J-STD-020 Level 1, with a maximum peak temperature of 260°C. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the DO-214AB molding compound is UL 94V-0 rated. No pre-bake is needed due to its moisture sensitivity level 1 classification - making the MUR420S fully compatible with standard Pb-free SMT assembly lines without process modification.
How does the forward voltage of the MUR420S change with temperature?
The MUR420S exhibits negative temperature coefficient for VF: it drops from 0.875V max at 4A/25°C to 0.710V max at 4A/150°C. This behavior improves thermal stability in high-power applications, reducing conduction loss as junction temperature rises. Designers must use the 150°C VF value for worst-case thermal analysis - a critical input when calculating total losses and heatsink sizing for the MUR420S in continuous-duty systems.
What is the marking code printed on the MUR420S package?
The MUR420S is marked with "MUR420S" on the cathode-band side of the DO-214AB (SMC) body, per ordering information and marking diagram in the official datasheet. Additional markings include factory code (F), date code (YW), and green compound indicator (G). This exact marking distinguishes it from MUR440S and MUR460S variants and confirms voltage rating during visual inspection of the MUR420S on assembled PCBs.
MUR420S 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):
- 200 V
- Current - Average Rectified (Io):
- 4A
- Voltage - Forward (Vf) (Max) @ If:
- -
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 25 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 200 V
- Capacitance @ Vr, F:
- 65pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
- Operating Temperature - Junction:
- -55°C ~ 175°C
MUR420S FAQ
1.How can I place an order for MUR420S through Aetrix?
Please submit a Request for Quotation (RFQ) for MUR420S 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 MUR420S reliable?
The price and inventory of MUR420S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MUR420S is usually 5 days.
3.What payment methods are accepted for MUR420S?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MUR420S transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MUR420S?
MUR420S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MUR420S 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 MUR420S?
For technical support, including MUR420S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MUR420S requirements.
6.How does Aetrix verify that MUR420S is sourced from the original manufacturer or authorized distributors?
All MUR420S 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 MUR420S meets industry standards.
7.What is the process for return or replacement of MUR420S?
All MUR420S units undergo pre-shipment inspection (PSI). If there is an issue with MUR420S, 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 MUR420S part is unused and in its original packaging.
Return procedure for MUR420S:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MUR420S Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
