Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Taiwan Semiconductor Corporation MUR340SB

Name: MUR340SB
Brand: Taiwan Semiconductor Corporation
SKU: MUR340SB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MUR340SB

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: MUR340SB.pdf

Description:: DIODE GEN PURP 400V 3A DO214AA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,893

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MUR340SB from Taiwan Semiconductor is a 3A, 400V fast recovery surface-mount rectifier in DO-214AA (SMB) package, featuring 50ns reverse recovery time, 1.25V max forward voltage at 3A/25°C, and 75A surge current rating; used in high-efficiency SMPS input stages for consumer power adapters and flat-panel displays.

For engineers reviewing the MUR340SB datasheet, MUR340SB pinout, MUR340SB application, or MUR340SB equivalent, key selection criteria include V_RRM = 400V, I_F = 3A, t_rr ≤ 50ns, thermal resistance R_θJA = 57°C/W on 10mm × 10mm Cu pad, and RoHS/halogen-free compliance for Class 2 whisker-safe assembly.

Technical Context

This single-die, unidirectional fast recovery rectifier uses glass-passivated junction technology to achieve low leakage (<10µA @ 25°C) and stable high-temperature operation up to 175°C junction temperature. Its 38pF junction capacitance and 50ns reverse recovery support high-frequency switching in 50–500kHz SMPS topologies.

The device is optimized for automated SMT placement with matte tin-plated leads compliant to J-STD-002, moisture sensitivity level 1 per J-STD-020, and UL 94V-0 molded compound - enabling reliable reflow soldering without derating in compact adapter PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in bridge or output rectification circuits
I_F	3 A - Continuous average forward current at T_L = 75°C on standard PCB; sets thermal design baseline for heatsinking
t_rr	≤ 50 ns - Measured at I_F = 0.5A, I_R = 1.0A, I_rr = 0.25A; enables efficient operation in 200+ kHz flyback converters
V_F max	1.25 V @ 3A, 25°C - Directly impacts conduction loss and thermal rise in primary-side rectification
R_θJA	57 °C/W - Junction-to-ambient thermal resistance on 10mm × 10mm Cu pad; determines maximum ambient temperature for full-load operation
I_FSM	75 A - Non-repetitive surge current capability; withstands inrush and transient overloads in AC-input front ends
Junction Temp	−55°C to +175°C - Operating range supports industrial and extended-temperature consumer applications

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode-indicated band; 0.110g mass; matte tin-plated leads; polarity marked by cathode band on molded body.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to AC input or transformer secondary; must handle full I_F and I_FSM with low-inductance layout
Cathode	Forward current exit / reverse blocking terminal	Connected to DC bus or filter capacitor; cathode band orientation critical for correct PCB placement

Key Features

Feature	Design Value
Glass passivated junction	Enables stable IR < 10µA @ 25°C and < 250µA @ 150°C, reducing standby power loss in no-load conditions
Fast recovery (t_rr ≤ 50ns)	Minimizes switching loss and EMI generation in high-frequency SMPS, improving efficiency above 100kHz
Moisture sensitivity level 1	Eliminates bake requirement prior to reflow, supporting direct placement in high-volume SMT lines
UL 94V-0 molding compound	Meets flammability safety requirements for enclosed power supplies in TV and monitor end equipment
Halogen-free per IEC 61249-2-21	Complies with environmental regulations for export to EU, Japan, and other regulated markets

Applications

AC-DC Adapter Input Rectification	Flat-Panel Display Power Supply
Use Scenario: 5–36W universal-input (90–264VAC) offline adapter for laptops and peripherals. IC Role / Device Role / Timing Role: Primary-side bridge or single-diode rectifier converting AC line to bulk DC before PFC or PWM stage. Use Value: 400V V_RRM and 75A I_FSM safely handle 264VAC peaks and cold-start surges; 50ns t_rr reduces switching loss vs. standard recovery diodes.	Use Scenario: Secondary-side output rectification in 12–24V, 3–5A LCD/LED TV power boards. IC Role / Device Role / Timing Role: High-efficiency freewheeling or synchronous rectifier replacement in flyback or LLC outputs. Use Value: 1.25V V_F max at 3A lowers conduction loss versus Schottky alternatives rated below 40V, extending thermal margin in confined chassis.
Monitor Power Module	Industrial SMPS Front End
Use Scenario: Compact 19V/2.1A internal power supply in desktop monitors with space-constrained PCBs. IC Role / Device Role / Timing Role: Surface-mount input rectifier mounted directly on primary-side board with minimal copper area. Use Value: DO-214AA (SMB) footprint enables dense layout; R_θJA = 57°C/W allows full 3A load at 50°C ambient without heatsink.	Use Scenario: 24V/3A auxiliary power supply in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Robust input rectifier operating continuously at −40°C to +70°C ambient with 175°C junction rating. Use Value: −55°C to +175°C storage/operating range ensures reliability across industrial temperature cycles; halogen-free construction meets IPC-1752A reporting.

AC-DC Adapter Input Rectification

Flat-Panel Display Power Supply

Use Scenario: 5–36W universal-input (90–264VAC) offline adapter for laptops and peripherals.

IC Role / Device Role / Timing Role: Primary-side bridge or single-diode rectifier converting AC line to bulk DC before PFC or PWM stage.

Use Value: 400V V_RRM and 75A I_FSM safely handle 264VAC peaks and cold-start surges; 50ns t_rr reduces switching loss vs. standard recovery diodes.

Use Scenario: Secondary-side output rectification in 12–24V, 3–5A LCD/LED TV power boards.

IC Role / Device Role / Timing Role: High-efficiency freewheeling or synchronous rectifier replacement in flyback or LLC outputs.

Use Value: 1.25V V_F max at 3A lowers conduction loss versus Schottky alternatives rated below 40V, extending thermal margin in confined chassis.

Monitor Power Module

Industrial SMPS Front End

Use Scenario: Compact 19V/2.1A internal power supply in desktop monitors with space-constrained PCBs.

IC Role / Device Role / Timing Role: Surface-mount input rectifier mounted directly on primary-side board with minimal copper area.

Use Value: DO-214AA (SMB) footprint enables dense layout; R_θJA = 57°C/W allows full 3A load at 50°C ambient without heatsink.

Use Scenario: 24V/3A auxiliary power supply in programmable logic controllers and motor drives.

IC Role / Device Role / Timing Role: Robust input rectifier operating continuously at −40°C to +70°C ambient with 175°C junction rating.

Use Value: −55°C to +175°C storage/operating range ensures reliability across industrial temperature cycles; halogen-free construction meets IPC-1752A reporting.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L04	V_RRM = 400V, I_F = 3A, t_rr = 35ns, DO-214AA, VF = 1.15V max @ 3A	Lower t_rr improves high-frequency efficiency but higher V_F increases conduction loss at light loads	Preferred where switching frequency >300kHz dominates loss budget; verify layout for tighter t_rr-induced ringing
ES3D	V_RRM = 200V, I_F = 3A, t_rr = 35ns, DO-214AA, VF = 0.95V max @ 3A	Half the V_RRM; unsuitable for 264VAC inputs but lower V_F benefits low-voltage DC-DC outputs	Only suitable for secondary-side or low-line applications; not a drop-in replacement for MUR340SB in primary rectification

Compared with STTH3L04 and ES3D, the MUR340SB offers balanced trade-off between 400V blocking capability, 50ns recovery, and 1.25V forward drop - making it optimal for universal-input primary rectification where both surge robustness and mid-frequency efficiency matter.

Availability

MUR340SB is available at Aetrix Electronics and suitable for switching mode power supplies, consumer adapters, and flat-panel display power modules requiring stable component supply and long-term industrial availability.

Supply support for MUR340SB 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 and protection markets since 1979.

The MUR340SB belongs to TSC's MURxSB fast recovery rectifier product line, designed specifically for high-efficiency, surface-mount AC-DC conversion in cost-sensitive consumer and industrial power supplies.

FAQ

What is the maximum junction temperature rating for the MUR340SB?

The MUR340SB has a maximum junction temperature (T_J) of +175°C and a minimum of −55°C. This wide operating range allows reliable use in environments with elevated ambient temperatures, such as enclosed TV power supplies or industrial control units. The device maintains specified electrical performance across this full range, and its thermal resistance values (R_θJA = 57°C/W, R_θJC = 14°C/W) are measured under defined test conditions per JEDEC standards.

Is the MUR340SB RoHS and halogen-free compliant?

Yes, the MUR340SB is RoHS compliant and halogen-free per IEC 61249-2-21. Taiwan Semiconductor confirms that the molding compound contains no brominated flame retardants or chlorine-based additives, and all lead finishes meet EU RoHS Directive 2011/65/EU requirements. This compliance is verified through material declarations and third-party testing reports available upon request for the MUR340SB.

What does the "SB" suffix indicate in MUR340SB?

The "SB" suffix in MUR340SB denotes the DO-214AA (SMB) surface-mount package variant. It distinguishes this version from through-hole equivalents (e.g., MUR340) and confirms compatibility with standard SMT pick-and-place equipment. The marking code "MUR340SB" is laser-etched on the device body, with cathode polarity indicated by a visible band - consistent across all SMB-packaged parts in the MURxSB family.

How is the reverse recovery time (t_rr) tested for the MUR340SB?

The MUR340SB reverse recovery time is measured under standardized conditions: I_F = 0.5A, I_R = 1.0A, I_rr = 0.25A, with pulse width and duty cycle per JEDEC JESD24-11. The typical value is not specified, but the maximum is guaranteed at ≤50ns. This test method ensures repeatable comparison across fast recovery rectifiers and reflects real-world behavior in hard-switched flyback and forward converters.

Can the MUR340SB replace a standard recovery rectifier like 1N4007 in a 24V adapter?

While the MUR340SB can electrically replace a 1N4007 in many 24V adapter designs due to its higher current (3A vs. 1A) and faster recovery (50ns vs. ~2µs), doing so requires verifying layout and thermal design. The MUR340SB's lower V_F reduces conduction loss, but its faster switching may increase EMI if snubbing is inadequate. Also, the DO-214AA footprint differs from DO-41 - mechanical redesign is needed. For new designs, the MUR340SB is preferred; for drop-in replacement, assess both electrical and mechanical fit for the MUR340SB.

MUR340SB Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AA, SMB

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:: 1.25 V @ 3 A

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

Reverse Recovery Time (trr):: 25 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 400 V

Capacitance @ Vr, F:: 45pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AA (SMB)

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

MUR340SB FAQ

1.How can I place an order for MUR340SB through Aetrix?

Please submit a Request for Quotation (RFQ) for MUR340SB 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 MUR340SB reliable?

The price and inventory of MUR340SB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MUR340SB is usually 5 days.

3.What payment methods are accepted for MUR340SB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MUR340SB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MUR340SB?

MUR340SB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MUR340SB 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 MUR340SB?

For technical support, including MUR340SB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MUR340SB requirements.

6.How does Aetrix verify that MUR340SB is sourced from the original manufacturer or authorized distributors?

All MUR340SB 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 MUR340SB meets industry standards.

7.What is the process for return or replacement of MUR340SB?

All MUR340SB units undergo pre-shipment inspection (PSI). If there is an issue with MUR340SB, 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 MUR340SB part is unused and in its original packaging.

Return procedure for MUR340SB:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

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, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

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.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

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.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

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…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

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…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

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…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

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 …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

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…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

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…