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

Vishay General Semiconductor - Diodes Division UF4001-E3/54

Name: UF4001-E3/54
Brand: Vishay General Semiconductor - Diodes Division
SKU: UF4001-E3/54
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UF4001-E3/54

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: Single Diodes

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

Datasheet:: UF4001-E3/54.pdf

Description:: DIODE GEN PURP 50V 1A DO204AL

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Product details

Overview

UF4001-E3/54 from Vishay General Semiconductor is an ultrafast plastic rectifier diode in DO-41 package, rated for 50 V repetitive peak reverse voltage (V_RRM), 1.0 A average forward current (I_F(AV)), and 50 ns reverse recovery time (t_rr). It delivers low forward voltage drop (1.0 V at 1.0 A), high surge capability (30 A I_FSM), and operates up to 150 °C junction temperature - used in high-frequency freewheeling and output rectification in SMPS.

For engineers reviewing the UF4001-E3/54 datasheet, UF4001-E3/54 pinout, UF4001-E3/54 application, or UF4001-E3/54 equivalent, key selection criteria include V_RRM = 50 V, t_rr = 50 ns, V_F = 1.0 V @ 1.0 A, I_FSM = 30 A, and DO-41 thermal resistance R_θJA = 60 °C/W - critical for compact, high-efficiency AC/DC and DC/DC converter designs.

Technical Context

The UF4001-E3/54 is a single silicon PN-junction ultrafast rectifier with glass-passivated chip construction, optimized for switching-mode power supplies operating above 20 kHz. Its 50 ns reverse recovery time enables reduced switching losses versus standard rectifiers, while its 1.0 V forward voltage minimizes conduction loss at 1.0 A DC load.

Designed for surface-mount-compatible through-hole assembly, it features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets JESD 201 Class 1A whisker testing. Polarity is marked by a cathode band; maximum solder dip is 275 °C for 10 s per JESD 22-B106.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - supports input rectification in low-voltage offline or DC-DC flyback outputs where peak reverse stress stays below 50 V
I_F(AV)	1.0 A at 55 °C ambient with 0.375" lead length - defines continuous DC output capability in compact converters
t_rr	50 ns - enables efficient operation in 100–500 kHz SMPS without excessive switching loss or EMI
V_F	1.0 V @ 1.0 A - reduces conduction loss to ~1.0 W at full load, improving thermal margin in sealed enclosures
I_FSM	30 A - withstands inrush and transient surges during startup or short-circuit recovery in 8.3 ms half-sine events
T_J(max)	150 °C - allows operation in thermally constrained industrial or automotive under-hood environments
C_J	17 pF @ 4.0 V, 1 MHz - limits capacitive coupling noise in high-dv/dt gate-drive or snubber circuits

Pinout & Package

Package: DO-41 (DO-204AL) axial-leaded plastic case with UL 94 V-0 molding compound; cathode indicated by color band on body.

Pin/Terminal	Circuit Role	Design Meaning
Anode (lead without band)	Forward current entry point	Connected to lower-potential side (e.g., transformer secondary center-tap or switch node return)
Cathode (lead with band)	Forward current exit / reverse blocking terminal	Connected to output capacitor positive or load return; blocks reverse voltage up to 50 V

Key Features

Feature	Design Value
Glass passivated junction	Enhances humidity resistance and long-term reliability in unsealed consumer and industrial assemblies
Ultrafast 50 ns t_rr	Reduces turn-off energy loss and associated heat generation in high-frequency DC/DC converters
Low 1.0 V forward drop	Lowers steady-state power dissipation vs. standard 1N400x series, easing thermal design in space-constrained PCBs
30 A non-repetitive surge rating	Supports robust startup behavior in flyback and forward converters without external current limiting
RoHS-compliant E3 suffix	Meets commercial-grade environmental compliance for global electronics manufacturing and end-of-life handling

Applications

AC/DC Adapter Output Rectification	DC/DC Flyback Secondary Side
Use Scenario: 5–12 V, 0.5–1.0 A output stage of wall-mounted AC/DC adapters for routers and IoT gateways. IC Role / Device Role / Timing Role: Ultrafast rectifier converting high-frequency transformer secondary AC to regulated DC output. Use Value: 50 ns t_rr and 1.0 V V_F minimize conduction + switching loss, enabling >85% efficiency in compact 25 mm × 25 mm footprints.	Use Scenario: Isolated 3.3 V/1 A auxiliary supply in industrial PLC power modules. IC Role / Device Role / Timing Role: Freewheeling diode clamping transformer leakage energy and providing continuous output current path. Use Value: 30 A I_FSM handles startup surges; DO-41 package allows manual rework and automated insertion in mixed-technology boards.
USB-C PD Power Path	LED Driver Freewheeling
Use Scenario: Secondary-side rectification in 20–30 W USB-C PD chargers operating at 100–250 kHz. IC Role / Device Role / Timing Role: Synchronous rectifier alternative where cost-sensitive designs avoid MOSFET drivers and control complexity. Use Value: 50 V V_RRM matches typical 5–20 V output ranges; 17 pF C_J limits high-frequency ringing in fast-switching topologies.	Use Scenario: Inductive LED driver for architectural lighting with 350 mA constant current and 12–24 V bus. IC Role / Device Role / Timing Role: Freewheeling path during MOSFET off-time in buck or boost LED controllers. Use Value: 150 °C T_J(max) ensures stable operation under sustained LED thermal loads; low V_F preserves driver efficiency over lifetime.

AC/DC Adapter Output Rectification

DC/DC Flyback Secondary Side

Use Scenario: 5–12 V, 0.5–1.0 A output stage of wall-mounted AC/DC adapters for routers and IoT gateways.

IC Role / Device Role / Timing Role: Ultrafast rectifier converting high-frequency transformer secondary AC to regulated DC output.

Use Value: 50 ns t_rr and 1.0 V V_F minimize conduction + switching loss, enabling >85% efficiency in compact 25 mm × 25 mm footprints.

Use Scenario: Isolated 3.3 V/1 A auxiliary supply in industrial PLC power modules.

IC Role / Device Role / Timing Role: Freewheeling diode clamping transformer leakage energy and providing continuous output current path.

Use Value: 30 A I_FSM handles startup surges; DO-41 package allows manual rework and automated insertion in mixed-technology boards.

USB-C PD Power Path

LED Driver Freewheeling

Use Scenario: Secondary-side rectification in 20–30 W USB-C PD chargers operating at 100–250 kHz.

IC Role / Device Role / Timing Role: Synchronous rectifier alternative where cost-sensitive designs avoid MOSFET drivers and control complexity.

Use Value: 50 V V_RRM matches typical 5–20 V output ranges; 17 pF C_J limits high-frequency ringing in fast-switching topologies.

Use Scenario: Inductive LED driver for architectural lighting with 350 mA constant current and 12–24 V bus.

IC Role / Device Role / Timing Role: Freewheeling path during MOSFET off-time in buck or boost LED controllers.

Use Value: 150 °C T_J(max) ensures stable operation under sustained LED thermal loads; low V_F preserves driver efficiency over lifetime.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R06U	V_RRM = 600 V, t_rr = 65 ns, V_F = 1.15 V @ 1 A, DO-41	Higher voltage rating suits universal-input SMPS; slower recovery increases loss above 200 kHz	Select when system requires ≥600 V blocking but can tolerate higher V_F and t_rr
1N4933	V_RRM = 200 V, t_rr = 200 ns, V_F = 1.2 V @ 1 A, DO-41	Standard fast (not ultrafast) recovery; higher loss in >50 kHz designs; lower cost	Acceptable only in low-frequency (<50 kHz), cost-driven applications where efficiency is secondary

Compared with STTH1R06U and 1N4933, UF4001-E3/54 provides optimal balance of low V_F, tight t_rr, and 50 V rating for compact, high-efficiency low-voltage SMPS - making it preferred for USB-C PD, PoE, and embedded DC/DC where thermal headroom and switching frequency are critical.

Availability

UF4001-E3/54 is available at Aetrix Electronics and suitable for AC/DC adapter output rectification, DC/DC flyback secondary side, USB-C PD power path, and LED driver freewheeling requiring stable component supply across production lifecycles.

Supply support for UF4001-E3/54 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 manufacturability.

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

FAQ

What is the maximum junction temperature rating for UF4001-E3/54?

The UF4001-E3/54 has a maximum junction temperature (T_J(max)) of +150 °C, verified per Vishay's datasheet revision 06-Apr-2020. This rating allows reliable operation in thermally demanding environments such as enclosed power adapters or industrial control units. Derating curves confirm 1.0 A I_F(AV) is maintained up to 55 °C ambient with standard 0.375" lead length. The UF4001-E3/54 must be mounted with adequate copper area or airflow to avoid exceeding this limit during continuous operation.

Is UF4001-E3/54 RoHS-compliant and halogen-free?

Yes, UF4001-E3/54 is RoHS-compliant per EU Directive 2011/65/EU, indicated by the "E3" suffix. It is not halogen-free; that designation applies only to "M3"-suffixed variants. The E3 version uses matte tin-plated leads and meets JESD 201 Class 1A whisker testing. Material compliance documentation is accessible via Vishay's material categorization portal (www.vishay.com/doc?99912). UF4001-E3/54 is approved for commercial-grade applications.

What is the reverse recovery time (t_rr) of UF4001-E3/54 and how is it measured?

The UF4001-E3/54 has a maximum 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 Vishay datasheet. This parameter reflects the diode's speed transitioning from forward conduction to reverse blocking - critical for minimizing switching loss in high-frequency converters. The value is guaranteed across temperature and process variation, and distinguishes UF4001-E3/54 from standard rectifiers like 1N4001 (t_rr > 2 μs).

Can UF4001-E3/54 replace 1N4001 in existing designs?

UF4001-E3/54 is a direct physical and electrical replacement for 1N4001 in DO-41 packages, sharing identical pinout, polarity marking, and mounting dimensions. However, it offers significantly faster recovery (50 ns vs. >2 μs), lower V_F (1.0 V vs. ~1.1 V), and higher I_FSM (30 A vs. 30 A). While drop-in compatible, designers should verify no unintended resonance or EMI arises from the faster switching edge. UF4001-E3/54 improves efficiency in new or upgraded SMPS designs.

What is the thermal resistance from junction to ambient (R_θJA) for UF4001-E3/54?

The typical thermal resistance from junction to ambient (R_θJA) for UF4001-E3/54 is 60 °C/W, measured with 0.375" (9.5 mm) lead length per JEDEC standards. This value assumes no added copper heatsinking; PCB layout with extended copper pads can reduce effective R_θJA. At 1.0 A and 1.0 V V_F, power dissipation is ~1.0 W - resulting in ~60 °C rise above ambient. For reliable operation, ambient temperature must remain ≤90 °C to stay within the 150 °C T_J(max) limit. UF4001-E3/54 data is confirmed in Vishay Document Number 88755.

UF4001-E3/54 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Series:: -

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

Packaging:: Tape & Reel (TR)

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-E3/54 FAQ

1.How can I place an order for UF4001-E3/54 through Aetrix?

Please submit a Request for Quotation (RFQ) for UF4001-E3/54 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-E3/54 reliable?

The price and inventory of UF4001-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UF4001-E3/54 is usually 5 days.

3.What payment methods are accepted for UF4001-E3/54?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UF4001-E3/54 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UF4001-E3/54?

UF4001-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UF4001-E3/54 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-E3/54?

For technical support, including UF4001-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UF4001-E3/54 requirements.

6.How does Aetrix verify that UF4001-E3/54 is sourced from the original manufacturer or authorized distributors?

All UF4001-E3/54 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-E3/54 meets industry standards.

7.What is the process for return or replacement of UF4001-E3/54?

All UF4001-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with UF4001-E3/54, 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-E3/54 part is unused and in its original packaging.

Return procedure for UF4001-E3/54:

1.Submit a request within 90 days.

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

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