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

Vishay General Semiconductor - Diodes Division UF4001-M3/73

Name: UF4001-M3/73
Brand: Vishay General Semiconductor - Diodes Division
SKU: UF4001-M3/73
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UF4001-M3/73

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: UF4001-M3/73.pdf

Description:: DIODE GEN PURP 50V 1A DO204AL

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Product details

Overview

UF4001-M3/73 from Vishay General Semiconductor is an ultrafast plastic rectifier diode in DO-41 package, rated for 50 V repetitive peak reverse voltage, 1.0 A average forward current, and 50 ns reverse recovery time. It features glass passivated junction, low 1.0 V forward voltage at 1.0 A, and operates up to 150 °C junction temperature - used in high-frequency freewheeling paths of SMPS and DC-DC converters.

For engineers reviewing the UF4001-M3/73 datasheet, UF4001-M3/73 pinout, UF4001-M3/73 application, or UF4001-M3/73 equivalent, key selection criteria include its 50 V V_RRM, 50 ns trr, DO-41 mechanical compatibility, halogen-free RoHS compliance (M3 suffix), and suitability for compact switching power supplies requiring fast recovery and low conduction loss.

Technical Context

The UF4001-M3/73 is a single silicon PN junction rectifier optimized for high-frequency operation. Its 50 ns reverse recovery time enables efficient switching at frequencies up to several hundred kHz, while the 1.0 V forward voltage at 1.0 A minimizes conduction losses in low-voltage output stages.

Designed with glass passivation for reliability and matte tin-plated leads compliant with J-STD-002, it supports soldering at 275 °C for 10 s and meets JESD 201 Class 1A whisker resistance. The DO-41 package provides standardized axial lead mounting with 0.375" (9.5 mm) lead length thermal derating.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - maximum repetitive reverse blocking capability, suitable for ≤35 V RMS or ≤50 V DC output rails
I_F(AV)	1.0 A at 55 °C ambient with 0.375" lead length - defines continuous DC output current handling in open-frame designs
t_rr	50 ns - enables use in ≥200 kHz switching converters without excessive switching loss or ringing
V_F	1.0 V at I_F = 1.0 A - reduces power dissipation to 1.0 W under full load, easing thermal design
T_J(max)	150 °C - allows operation in sealed enclosures or high-ambient industrial environments
C_J	17 pF at 4.0 V, 1 MHz - limits capacitive coupling noise in high-dv/dt gate drive or feedback paths

Pinout & Package

Package: DO-41 (DO-204AL), axial-leaded, epoxy-molded case meeting UL 94 V-0. Cathode indicated by color band on body. Leads are matte tin-plated, solderable per J-STD-002.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Forward current entry	Connected to input/source side of rectification path; must handle 30 A non-repetitive surge
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to output/load side; blocks up to 50 V reverse voltage with ≤10 μA leakage at 25 °C

Key Features

Feature	Design Value
Glass passivated chip junction	Enhances humidity resistance and long-term stability in unsealed industrial environments
Ultrafast 50 ns recovery	Reduces switching loss and EMI generation in high-frequency flyback and buck-derived topologies
Low 1.0 V forward drop at 1.0 A	Lowers conduction loss by ~15–20% versus standard 1N400x series, improving efficiency in low-V_OUT supplies
Halogen-free, RoHS-compliant (M3)	Meets IPC-1752A material declaration requirements for green electronics manufacturing

Applications

AC-DC Adapter Output Stage	DC-DC Converter Freewheel Diode
Use Scenario: Secondary-side rectification in 5–24 V output wall adapters with 50–200 kHz switching frequency. IC Role / Device Role / Timing Role: Ultrafast rectifier conducting during transformer secondary voltage polarity, blocking reverse voltage between cycles. Use Value: 50 ns t_rr prevents reverse recovery current overlap with primary switch turn-on, reducing cross-conduction loss and MOSFET stress.	Use Scenario: Freewheel path in synchronous-buck or flyback converter output stage delivering ≤1 A at ≤50 V. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path when main switch is off; handles 30 A surge during startup or overload. Use Value: 1.0 V V_F limits conduction loss to ≤1.0 W at full load, simplifying heatsinking in space-constrained PCB layouts.
Industrial Sensor Power Supply	Telecom DC Input Protection
Use Scenario: Local 12 V or 24 V rail generation for analog sensor modules in factory automation cabinets. IC Role / Device Role / Timing Role: Input rectifier for isolated DC-DC module powering precision ADCs and signal conditioners. Use Value: 150 °C T_J(max) ensures reliable operation near hot PLC backplanes or motor drives without derating.	Use Scenario: Reverse polarity and transient protection at 48 V telecom system input before DC-DC conversion. IC Role / Device Role / Timing Role: Series-connected blocking diode preventing damage from accidental battery reversal or hot-swap events. Use Value: 30 A I_FSM withstands 8.3 ms surges from capacitor inrush or lightning-induced transients per GR-1089.

AC-DC Adapter Output Stage

DC-DC Converter Freewheel Diode

Use Scenario: Secondary-side rectification in 5–24 V output wall adapters with 50–200 kHz switching frequency.

IC Role / Device Role / Timing Role: Ultrafast rectifier conducting during transformer secondary voltage polarity, blocking reverse voltage between cycles.

Use Value: 50 ns t_rr prevents reverse recovery current overlap with primary switch turn-on, reducing cross-conduction loss and MOSFET stress.

Use Scenario: Freewheel path in synchronous-buck or flyback converter output stage delivering ≤1 A at ≤50 V.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path when main switch is off; handles 30 A surge during startup or overload.

Use Value: 1.0 V V_F limits conduction loss to ≤1.0 W at full load, simplifying heatsinking in space-constrained PCB layouts.

Industrial Sensor Power Supply

Telecom DC Input Protection

Use Scenario: Local 12 V or 24 V rail generation for analog sensor modules in factory automation cabinets.

IC Role / Device Role / Timing Role: Input rectifier for isolated DC-DC module powering precision ADCs and signal conditioners.

Use Value: 150 °C T_J(max) ensures reliable operation near hot PLC backplanes or motor drives without derating.

Use Scenario: Reverse polarity and transient protection at 48 V telecom system input before DC-DC conversion.

IC Role / Device Role / Timing Role: Series-connected blocking diode preventing damage from accidental battery reversal or hot-swap events.

Use Value: 30 A I_FSM withstands 8.3 ms surges from capacitor inrush or lightning-induced transients per GR-1089.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4933GP-E3/54	V_RRM = 100 V, t_rr = 200 ns, V_F = 1.2 V @ 1.0 A	Slower recovery increases switching loss above 50 kHz; higher V_RRM suits 72 V systems	Select only if higher reverse voltage margin is required and switching frequency remains ≤50 kHz
US1A-M3/73	V_RRM = 50 V, t_rr = 75 ns, V_F = 1.0 V @ 1.0 A, same DO-41 package	75 ns t_rr increases recovery loss slightly but maintains identical footprint and thermal profile	Acceptable alternative where 25 ns slower recovery is tolerable in cost-sensitive designs

Compared with UF4001-M3/73, 1N4933GP-E3/54 offers higher voltage rating but sacrifices speed, while US1A-M3/73 matches voltage and package but trades 25 ns in recovery time - both require re-evaluation of snubber design and efficiency targets.

Availability

UF4001-M3/73 is available at Aetrix Electronics and suitable for AC-DC adapters, DC-DC converter freewheeling paths, and industrial sensor power supplies requiring stable component supply, halogen-free compliance, and proven DO-41 reliability.

Supply support for UF4001-M3/73 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

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on reliability, efficiency, and industrial-grade qualification.

The UF400x family was designed specifically for high-frequency switching power conversion, targeting improved efficiency and reduced EMI over legacy 1N400x rectifiers in consumer, computing, and telecom power supplies.

FAQ

What is the maximum junction temperature rating for UF4001-M3/73?

The UF4001-M3/73 has a maximum junction temperature (T_J(max)) of +150 °C. This rating allows operation in high-ambient environments such as enclosed power supplies or industrial control cabinets. Derating curves in the Vishay datasheet specify that average forward current must be reduced linearly above 55 °C ambient when using 0.375" lead length. The UF4001-M3/73 maintains specified electrical performance within this thermal envelope.

Is UF4001-M3/73 pin-compatible with standard 1N4001 diodes?

Yes, UF4001-M3/73 uses the DO-41 package with identical axial lead spacing and dimensions as 1N4001, enabling direct PCB replacement. However, UF4001-M3/73 offers faster 50 ns recovery versus 1N4001's 30 µs, lower 1.0 V forward voltage versus 1.1 V, and higher 30 A surge rating versus 30 A - making it a functional upgrade in high-frequency designs. The UF4001-M3/73 retains the same cathode band polarity marking.

What does the "M3" suffix indicate in UF4001-M3/73?

"M3" denotes halogen-free, RoHS-compliant construction per IEC 61249-2-21, with no brominated flame retardants or antimony trioxide. It also meets JESD 201 Class 1A whisker resistance and is qualified for commercial temperature range (−55 °C to +150 °C). The "/73" indicates ammo pack packaging (3000 units per pack), distinct from tape-and-reel "/54". UF4001-M3/73 is not identical to E3-suffix variants, which are RoHS-compliant but not halogen-free.

Can UF4001-M3/73 be used in place of UF4004 in a 400 V design?

No. UF4001-M3/73 is rated for 50 V maximum repetitive peak reverse voltage (V_RRM), whereas UF4004 is rated for 400 V. Substituting UF4001-M3/73 in a 400 V circuit will result in immediate reverse breakdown and catastrophic failure. Always match V_RRM to the peak inverse voltage seen across the diode, including safety margin. For 400 V applications, use UF4004-M3/73 or equivalent.

What is the typical junction capacitance of UF4001-M3/73 and why does it matter?

The UF4001-M3/73 has a typical junction capacitance (C_J) of 17 pF measured at 4.0 V and 1 MHz. This value impacts high-frequency switching behavior: lower C_J reduces displacement current during voltage transitions, minimizing EMI and gate drive loading in adjacent MOSFETs. In flyback snubber networks or EMI filter design, C_J contributes to total node capacitance and must be included in timing calculations for the UF4001-M3/73.

UF4001-M3/73 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Box (TB)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 50 V

Current - Average Rectified (Io):: 1A

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

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

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 50 V

Capacitance @ Vr, F:: 17pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

Operating Temperature - Junction:: -55°C ~ 150°C

UF4001-M3/73 FAQ

1.How can I place an order for UF4001-M3/73 through Aetrix?

Please submit a Request for Quotation (RFQ) for UF4001-M3/73 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 UF4001-M3/73 reliable?

The price and inventory of UF4001-M3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UF4001-M3/73 is usually 5 days.

3.What payment methods are accepted for UF4001-M3/73?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UF4001-M3/73 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UF4001-M3/73?

UF4001-M3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UF4001-M3/73 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 UF4001-M3/73?

For technical support, including UF4001-M3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UF4001-M3/73 requirements.

6.How does Aetrix verify that UF4001-M3/73 is sourced from the original manufacturer or authorized distributors?

All UF4001-M3/73 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 UF4001-M3/73 meets industry standards.

7.What is the process for return or replacement of UF4001-M3/73?

All UF4001-M3/73 units undergo pre-shipment inspection (PSI). If there is an issue with UF4001-M3/73, 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 UF4001-M3/73 part is unused and in its original packaging.

Return procedure for UF4001-M3/73:

1.Submit a request within 90 days.

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

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