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

Taiwan Semiconductor Corporation MUR140SH

Name: MUR140SH
Brand: Taiwan Semiconductor Corporation
SKU: MUR140SH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MUR140SH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AA, SMB

Datasheet:: MUR140SH.pdf

Description:: DIODE GEN PURP 400V 1A DO214AA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MUR140SH from Taiwan Semiconductor is an AEC-Q101-qualified ultra-fast recovery surface-mount rectifier in DO-214AA (SMB) package, rated for 400 V repetitive peak reverse voltage (V_RRM), 1 A average forward current (I_F), and 50 ns reverse recovery time (t_rr). It delivers low forward voltage (1.25 V at 1 A, 25°C) and operates up to 175°C junction temperature, serving as a freewheeling or snubber diode in automotive DC-DC converters and LED lighting systems.

For engineers reviewing the MUR140SH datasheet, MUR140SH pinout, MUR140SH application, or MUR140SH equivalent, key selection criteria include its 400 V V_RRM, 50 ns t_rr, AEC-Q101 qualification, DO-214AA mechanical compatibility, and thermal resistance of 17°C/W - all critical for high-efficiency, high-reliability automotive power designs.

Technical Context

The MUR140SH is a single-die, glass-passivated silicon rectifier optimized for fast switching in high-frequency power conversion. Its 50 ns reverse recovery time enables reduced switching losses in flyback and buck-derived topologies, while its 17°C/W junction-to-lead thermal resistance supports sustained 1 A conduction under constrained PCB thermal conditions.

Designed for automotive-grade reliability, it meets JESD201 Class 2 whisker resistance, J-STD-020 Level 1 moisture sensitivity, and RoHS/halogen-free compliance. The cathode-band polarity marking and matte tin-plated leads ensure robust automated assembly and solder joint integrity in reflow processes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Withstands repetitive reverse voltage up to 400 V, enabling use in 24 V/48 V automotive bus-derived DC-DC stages with safety margin.
I_F	1 A continuous - Supports steady-state output rectification in compact 10–25 W power supplies without forced cooling.
t_rr	50 ns - Minimizes reverse recovery charge (Q_rr) and associated switching loss in >100 kHz converters.
V_F	1.25 V @ 1 A, 25°C - Limits conduction loss to ≤1.25 W per device, easing thermal management in SMB footprint.
R_θJL	17 °C/W - Enables direct heat transfer from junction to PCB copper pad, supporting >0.8 A derated current at T_L = 100°C.
I_FSM	35 A @ 8.3 ms - Handles inrush and fault currents typical of automotive load dump or cold-crank transients.
T_J max	175 °C - Allows operation in under-hood environments where ambient exceeds 125°C with proper layout.

Pinout & Package

Package: DO-214AA (SMB), surface-mount, single-anode/single-cathode configuration. Cathode identified by molded band on body.

Pin/Terminal	Circuit Role	Design Meaning
Anode (lead 1)	Forward current entry	Connected to lower-potential node (e.g., switch node in boost/flyback); requires adequate copper pour for thermal dissipation.
Cathode (lead 2)	Forward current exit / reverse blocking terminal	Connected to output rail; cathode band must align with PCB silkscreen polarity mark to prevent assembly error.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive power electronics including engine control modules and lighting ECUs requiring zero-failure reliability over 15-year service life.
Glass-passivated junction	Prevents moisture-induced leakage and surface degradation, ensuring stable IR < 5 µA at 400 V and 150°C over lifetime.
Ultra-fast 50 ns t_rr	Reduces turn-off switching loss by >40% versus standard FR1 diodes in 200–500 kHz DC-DC designs, improving efficiency by 0.5–1.2%.
Level 1 moisture sensitivity	Eliminates bake preconditioning before SMT reflow, reducing manufacturing cycle time and cost in high-volume automotive production.
Halogen-free & RoHS	Complies with EU ELV and China RoHS directives, enabling global vehicle program acceptance without material declaration exceptions.

Applications

Automotive DC-DC Converters	LED Headlamp Drivers
Use Scenario: Step-down conversion from 12 V/48 V battery to 5–12 V for infotainment and ADAS sensors. IC Role / Device Role / Timing Role: Output rectifier in synchronous or quasi-resonant buck converter, conducting during low-side switch off-time. Use Value: 50 ns t_rr minimizes cross-conduction loss with MOSFETs; 400 V rating accommodates load-dump transients up to ISO 7637-2 Pulse 5a.	Use Scenario: Constant-current regulation for high-brightness LED arrays in adaptive front lighting systems (AFS). IC Role / Device Role / Timing Role: Freewheeling path for inductive current during PWM dimming cycles in buck-boost LED drivers. Use Value: Low V_F (1.25 V) reduces power loss in high-duty-cycle operation; AEC-Q101 ensures survival across -40°C to +125°C ambient.
Snubber Networks	Industrial Power Supplies
Use Scenario: RCD clamp circuit across MOSFETs or IGBTs in SMPS and motor drives. IC Role / Device Role / Timing Role: Fast-recovery path for transient energy dissipation during switching transitions. Use Value: 50 ns t_rr prevents reverse recovery oscillation that could trigger false gate triggering or EMI spikes above 30 MHz.	Use Scenario: Output rectification in 15–30 W industrial AC-DC adapters for PLC I/O modules and sensors. IC Role / Device Role / Timing Role: Primary secondary-side rectifier in isolated flyback topology operating at 65–130 kHz. Use Value: DO-214AA footprint allows drop-in replacement of legacy FR1/FR2 devices; 17°C/W R_θJL enables >0.9 A derated current on 1 oz. copper with 25 mm² pad.

Automotive DC-DC Converters

LED Headlamp Drivers

Use Scenario: Step-down conversion from 12 V/48 V battery to 5–12 V for infotainment and ADAS sensors.

IC Role / Device Role / Timing Role: Output rectifier in synchronous or quasi-resonant buck converter, conducting during low-side switch off-time.

Use Value: 50 ns t_rr minimizes cross-conduction loss with MOSFETs; 400 V rating accommodates load-dump transients up to ISO 7637-2 Pulse 5a.

Use Scenario: Constant-current regulation for high-brightness LED arrays in adaptive front lighting systems (AFS).

IC Role / Device Role / Timing Role: Freewheeling path for inductive current during PWM dimming cycles in buck-boost LED drivers.

Use Value: Low V_F (1.25 V) reduces power loss in high-duty-cycle operation; AEC-Q101 ensures survival across -40°C to +125°C ambient.

Snubber Networks

Industrial Power Supplies

Use Scenario: RCD clamp circuit across MOSFETs or IGBTs in SMPS and motor drives.

IC Role / Device Role / Timing Role: Fast-recovery path for transient energy dissipation during switching transitions.

Use Value: 50 ns t_rr prevents reverse recovery oscillation that could trigger false gate triggering or EMI spikes above 30 MHz.

Use Scenario: Output rectification in 15–30 W industrial AC-DC adapters for PLC I/O modules and sensors.

IC Role / Device Role / Timing Role: Primary secondary-side rectifier in isolated flyback topology operating at 65–130 kHz.

Use Value: DO-214AA footprint allows drop-in replacement of legacy FR1/FR2 devices; 17°C/W R_θJL enables >0.9 A derated current on 1 oz. copper with 25 mm² pad.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1L06S	600 V V_RRM, 55 ns t_rr, 1.15 V V_F @ 1 A, 25°C; same DO-214AA package.	Higher voltage margin suits 48 V telecom systems; slightly slower recovery increases switching loss in >300 kHz designs.	Select when 600 V rating is required and 5 ns t_rr penalty is acceptable for cost-sensitive industrial use.
ON Semi MUR140E	Same 400 V V_RRM, 50 ns t_rr, but rated for 150°C T_J max and lacks AEC-Q101 qualification.	Not qualified for automotive under-hood use; suitable for commercial/industrial DC-DC where qualification is not mandated.	Choose for non-automotive applications where AEC-Q101 is unnecessary and lead-time favors ON Semi distribution channels.

Compared with STTH1L06S and MUR140E, the MUR140SH uniquely combines AEC-Q101 qualification, 400 V rating, and 50 ns t_rr in DO-214AA - making it the only option qualified for automotive front-end DC-DC and LED driver designs requiring both reliability and high-frequency efficiency.

Availability

MUR140SH is available at Aetrix Electronics and suitable for automotive DC-DC converters, LED headlamp drivers, and industrial snubber networks requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for MUR140SH 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, specializing in high-reliability power devices for automotive and industrial markets.

The MUR1xxSH series was designed specifically for AEC-Q101-compliant ultra-fast rectification in next-generation automotive power systems, emphasizing thermal robustness, fast recovery, and automated assembly compatibility.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the MUR140SH?

The MUR140SH has a maximum repetitive peak reverse voltage (V_RRM) of 400 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version A2102). This rating applies across the full operating temperature range and defines the highest reverse voltage the device can block repeatedly without breakdown. The "140" in MUR140SH directly indicates this 400 V rating, consistent with the family naming convention (e.g., MUR105SH = 50 V, MUR160SH = 600 V).

Is the MUR140SH qualified for automotive applications?

Yes, the MUR140SH is explicitly AEC-Q101 qualified, as stated in the FEATURES section of the Taiwan Semiconductor datasheet. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and other reliability parameters required for automotive electronic components. The MUR140SH is therefore approved for use in automotive power systems such as DC-DC converters and LED lighting modules where mission-critical reliability is mandated.

What is the reverse recovery time (t_rr) of the MUR140SH and how is it measured?

The MUR140SH has a reverse recovery time (t_rr) of 50 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_RR = 0.25 A, per the Electrical Specifications table. This value is specified for the entire MUR140SH–MUR160SH subgroup and reflects the time required for the diode to transition from forward conduction to reverse blocking state. The 50 ns t_rr enables efficient operation in high-frequency switching power supplies up to 500 kHz.

What package type does the MUR140SH use and what are its key mechanical features?

The MUR140SH uses the DO-214AA (SMB) surface-mount package, as confirmed in the MECHANICAL DATA and ORDERING INFORMATION sections. Key features include a UL 94V-0 compliant molding compound, matte tin-plated leads compliant with J-STD-002, JESD201 Class 2 whisker resistance, and polarity indicated by a cathode band. Its weight is approximately 0.090 g, and it supports automated placement per the datasheet's "Ideal for automated placement" feature statement.

What is the forward voltage (V_F) of the MUR140SH at 1 A and 25°C?

The forward voltage (V_F) of the MUR140SH is 1.25 V at I_F = 1 A and T_J = 25°C, as specified in the Electrical Specifications table under "Forward voltage(1)". At elevated junction temperature (150°C), V_F drops to 1.05 V due to the negative temperature coefficient of silicon PN junctions. This low V_F contributes to reduced conduction losses in high-efficiency power conversion stages.

MUR140SH 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):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.25 V @ 1 A

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

Reverse Recovery Time (trr):: 50 ns

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

Capacitance @ Vr, F:: -

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

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

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

MUR140SH FAQ

1.How can I place an order for MUR140SH through Aetrix?

Please submit a Request for Quotation (RFQ) for MUR140SH 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 MUR140SH reliable?

The price and inventory of MUR140SH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MUR140SH is usually 5 days.

3.What payment methods are accepted for MUR140SH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MUR140SH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MUR140SH?

MUR140SH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MUR140SH 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 MUR140SH?

For technical support, including MUR140SH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MUR140SH requirements.

6.How does Aetrix verify that MUR140SH is sourced from the original manufacturer or authorized distributors?

All MUR140SH 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 MUR140SH meets industry standards.

7.What is the process for return or replacement of MUR140SH?

All MUR140SH units undergo pre-shipment inspection (PSI). If there is an issue with MUR140SH, 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 MUR140SH part is unused and in its original packaging.

Return procedure for MUR140SH:

1.Submit a request within 90 days.

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

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