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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation MUR340S

Name: MUR340S
Brand: Taiwan Semiconductor Corporation
SKU: MUR340S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MUR340S

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AB, SMC

Datasheet:: MUR340S.pdf

Description:: DIODE GEN PURP 400V 3A DO214AB

Quantity:: RFQ Add To RFQ list

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Inventory:2,998

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Product details

Overview

MUR340S from Taiwan Semiconductor is an ultra-fast recovery surface-mount rectifier diode in DO-214AB (SMC) package, rated for 400 V repetitive peak reverse voltage (V_RRM), 3 A average forward current (I_F), and 50 ns reverse recovery time (t_rr). It serves as a high-efficiency freewheeling or output rectifier in switching-mode power supplies for telecom and computing equipment.

For engineers reviewing the MUR340S datasheet, MUR340S pinout, MUR340S application, or MUR340S equivalent, key selection criteria include its 400 V V_RRM, 1.25 V forward voltage at 3 A and 25°C, 75 A non-repetitive surge rating, 175°C maximum junction temperature, and DO-214AB mechanical compatibility with automated SMT assembly.

Technical Context

The MUR340S is a single-die, planar passivated silicon PN junction rectifier optimized for high-frequency operation. Its ultra-fast t_rr of 50 ns enables reduced switching losses in DC-DC converters operating above 100 kHz, while its glass-passivated junction ensures stable performance under thermal cycling and humidity stress.

Designed for surface-mount use in space-constrained power stages, the device features matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Polarity is indicated by a cathode band, and the molding compound meets UL 94V-0 flammability requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - supports input rectification or secondary-side output in 24–48 V telecom PSUs with 2× safety margin
I_F	3 A continuous - delivers up to 75 W at 25°C ambient with standard PCB copper area
t_rr	50 ns - enables efficient operation in 200–500 kHz SMPS topologies without excessive switching loss
V_F @ 3 A, 25°C	1.25 V - contributes ~3.75 W conduction loss per diode at full load, requiring thermal management
R_θJL	11 °C/W - allows direct lead-to-PCB heat transfer; 10°C rise per watt into copper pour
I_FSM	75 A - withstands inrush and transient surges typical in hot-plug or line-dip recovery scenarios
T_J(max)	175°C - supports operation in sealed enclosures or high-ambient industrial environments

Pinout & Package

Package: DO-214AB (SMC), surface-mount plastic case with cathode band marking; dimensions 7.75 mm × 6.25 mm × 2.45 mm; weight ≈ 0.210 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter or transformer center-tap)
Cathode	Forward current exit / reverse blocking terminal	Marked by band; ties to output rail or positive bus; blocks 400 V reverse during off-state

Key Features

Feature	Design Value
Glass-passivated junction	Ensures long-term reliability under thermal-humidity bias; eliminates need for conformal coating in IPC Class 2 environments
Ultra-fast 50 ns recovery	Reduces reverse recovery charge (Q_rr) to <15 nC, minimizing EMI and cross-conduction risk in synchronous rectifier designs
Moisture sensitivity level 1	Allows unlimited floor life before reflow; no baking required prior to assembly
Halogen-free & RoHS-compliant	Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing and end-of-life compliance
DO-214AB (SMC) footprint	Standardized land pattern enables drop-in replacement across multiple vendors' 3 A ultrafast rectifiers

Applications

Telecom AC-DC Adapters	Server VRM Output Rectification
Use Scenario: Secondary-side rectification in 48 V input, 12 V/30 A isolated DC-DC modules for 5G baseband units. IC Role / Device Role / Timing Role: Ultra-fast output rectifier replacing slower FR series to reduce switching loss and improve efficiency above 250 kHz. Use Value: 50 ns t_rr cuts Q_rr-related losses by ~40% vs. standard fast recovery diodes, enabling >94% full-load efficiency.	Use Scenario: Freewheeling path in multiphase buck converters supplying CPU core voltage (0.8–1.2 V) at >300 A. IC Role / Device Role / Timing Role: Low-loss synchronous rectifier companion or primary rectifier in low-duty-cycle, high-di/dt phases. Use Value: 1.25 V V_F at 3 A limits conduction loss to 3.75 W per phase, easing thermal design on dense VRM PCBs.
Industrial PLC Power Supplies	LED Driver Secondary Rectification
Use Scenario: Input bridge rectification in 24 V DC-input, wide-temp (-40°C to +85°C) power modules for programmable logic controllers. IC Role / Device Role / Timing Role: High-reliability input rectifier handling 100 V transients and sustained 70°C ambient. Use Value: 175°C T_J(max) and -55°C to +175°C storage range ensure uninterrupted operation in unventilated control cabinets.	Use Scenario: Output rectification in constant-current LED drivers powering streetlight arrays (36–48 V, 1–2 A). IC Role / Device Role / Timing Role: Compact, thermally robust rectifier mounted directly on aluminum-backed PCBs. Use Value: DO-214AB package provides 11 °C/W junction-to-lead thermal resistance, enabling direct heatsinking without external hardware.

Telecom AC-DC Adapters

Server VRM Output Rectification

Use Scenario: Secondary-side rectification in 48 V input, 12 V/30 A isolated DC-DC modules for 5G baseband units.

IC Role / Device Role / Timing Role: Ultra-fast output rectifier replacing slower FR series to reduce switching loss and improve efficiency above 250 kHz.

Use Value: 50 ns t_rr cuts Q_rr-related losses by ~40% vs. standard fast recovery diodes, enabling >94% full-load efficiency.

Use Scenario: Freewheeling path in multiphase buck converters supplying CPU core voltage (0.8–1.2 V) at >300 A.

IC Role / Device Role / Timing Role: Low-loss synchronous rectifier companion or primary rectifier in low-duty-cycle, high-di/dt phases.

Use Value: 1.25 V V_F at 3 A limits conduction loss to 3.75 W per phase, easing thermal design on dense VRM PCBs.

Industrial PLC Power Supplies

LED Driver Secondary Rectification

Use Scenario: Input bridge rectification in 24 V DC-input, wide-temp (-40°C to +85°C) power modules for programmable logic controllers.

IC Role / Device Role / Timing Role: High-reliability input rectifier handling 100 V transients and sustained 70°C ambient.

Use Value: 175°C T_J(max) and -55°C to +175°C storage range ensure uninterrupted operation in unventilated control cabinets.

Use Scenario: Output rectification in constant-current LED drivers powering streetlight arrays (36–48 V, 1–2 A).

IC Role / Device Role / Timing Role: Compact, thermally robust rectifier mounted directly on aluminum-backed PCBs.

Use Value: DO-214AB package provides 11 °C/W junction-to-lead thermal resistance, enabling direct heatsinking without external hardware.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-fast rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L04S	400 V V_RRM, 3 A I_F, 45 ns t_rr, VF = 1.20 V @ 3 A, DO-214AB	Slightly faster recovery but lower surge rating (60 A I_FSM vs. 75 A)	Preferred where EMI reduction is critical and surge margin is less constrained
ON Semi MUR340E	400 V V_RRM, 3 A I_F, 50 ns t_rr, VF = 1.25 V @ 3 A, same DO-214AB	Identical electrical specs; differs in halogen-free compliance status and moisture sensitivity level (MSL 1 vs. MSL 2a)	Direct alternative when MSL 1 handling or IEC 61249-2-21 compliance is mandatory

Compared with STTH3L04S and MUR340E, the MUR340S offers identical 400 V/3 A/50 ns performance with superior surge robustness (75 A) and guaranteed MSL 1 handling-making it optimal for high-reliability, high-volume SMT production where floor life and transient immunity are prioritized.

Availability

MUR340S is available at Aetrix Electronics and suitable for telecom AC-DC adapters, server VRM output stages, and industrial PLC power supplies requiring stable component supply, consistent parametric performance, and full traceability across production lots.

Supply support for MUR340S 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 power, automotive, and industrial markets since 1979.

The MUR340S belongs to TSC's MURxS ultra-fast rectifier family, engineered specifically for high-frequency switching power conversion where low Q_rr, stable V_F, and rugged packaging are essential for efficiency and reliability.

FAQ

What is the maximum junction temperature rating for the MUR340S?

The MUR340S has a maximum junction temperature (T_J(max)) of +175°C, allowing reliable operation in high-ambient environments such as enclosed industrial power supplies or thermally dense server VRMs. This rating is validated per JEDEC test conditions and supports derating curves up to 175°C ambient when used with appropriate PCB copper area. The MUR340S maintains specified electrical parameters within this full range, and its glass-passivated die ensures stability across thermal cycles.

Does the MUR340S have a defined moisture sensitivity level (MSL) for SMT assembly?

Yes, the MUR340S is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30°C/60% RH and requires no baking prior to reflow soldering. This simplifies manufacturing logistics and eliminates moisture-related popcorning risks during lead-free reflow. The MUR340S achieves this via hermetic-grade molding compound and controlled internal humidity levels, confirmed through standardized preconditioning tests.

What is the reverse recovery time (t_rr) of the MUR340S, and under what test conditions is it measured?

The MUR340S has a typical reverse recovery time (t_rr) of 50 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, I_RR = 0.25 A, and T_J = 25°C. This value reflects its ultra-fast recovery capability, critical for minimizing switching losses in high-frequency SMPS. The MUR340S maintains t_rr < 75 ns even at 150°C junction temperature, ensuring consistent performance across operating conditions.

Is the MUR340S halogen-free and RoHS-compliant?

Yes, the MUR340S is both halogen-free per IEC 61249-2-21 and RoHS-compliant per EU Directive 2011/65/EU. The molding compound contains no brominated flame retardants or chlorine-based additives, and all terminations use matte tin plating without lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE. Full compliance documentation is available upon request for MUR340S lot traceability.

What package type does the MUR340S use, and are its dimensions standardized?

The MUR340S uses the DO-214AB (SMC) surface-mount package, fully compliant with JEDEC DO-214, Variation AB, Issue D. Its dimensions are 7.75 mm × 6.25 mm × 2.45 mm, with standardized pad layout and cathode band polarity marking. This package is widely supported in CAD libraries and compatible with standard SMT pick-and-place and reflow processes, making the MUR340S suitable for high-volume automated assembly lines.

MUR340S 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):: 400 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: -

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 400 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AB (SMC)

Operating Temperature - Junction:: -55°C ~ 175°C

MUR340S FAQ

1.How can I place an order for MUR340S through Aetrix?

Please submit a Request for Quotation (RFQ) for MUR340S 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 MUR340S reliable?

The price and inventory of MUR340S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MUR340S is usually 5 days.

3.What payment methods are accepted for MUR340S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MUR340S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MUR340S?

MUR340S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MUR340S 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 MUR340S?

For technical support, including MUR340S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MUR340S requirements.

6.How does Aetrix verify that MUR340S is sourced from the original manufacturer or authorized distributors?

All MUR340S 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 MUR340S meets industry standards.

7.What is the process for return or replacement of MUR340S?

All MUR340S units undergo pre-shipment inspection (PSI). If there is an issue with MUR340S, 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 MUR340S part is unused and in its original packaging.

Return procedure for MUR340S:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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