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

Taiwan Semiconductor Corporation UF4004 A0G

Name: UF4004 A0G
Brand: Taiwan Semiconductor Corporation
SKU: UF4004 A0G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UF4004 A0G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: UF4004 A0G.pdf

Description:: DIODE GEN PURP 400V 1A DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:5,216

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Product details

Overview

UF4004 A0G from Taiwan Semiconductor is a 1A, 400V ultrafast recovery rectifier diode in DO-204AL (DO-41) package, featuring 50 ns reverse recovery time, 1.0 V forward voltage at 1 A, and 30 A surge current capability. It serves as a freewheeling or output rectifier in high-frequency switching power supplies.

For engineers reviewing the UF4004 A0G datasheet, UF4004 A0G pinout, UF4004 A0G application, or UF4004 A0G equivalent, key selection criteria include V_RRM = 400 V, t_rr = 50 ns, V_F = 1.0 V @ 1 A, thermal resistance R_θJL = 15 °C/W, and DO-41 mechanical compatibility with automated through-hole assembly.

Technical Context

This single-die silicon rectifier uses glass-passivated junction technology to sustain 150 °C maximum junction temperature and deliver stable performance under repetitive 8.3 ms half-sine surge conditions up to 30 A. Its low capacitance (17 pF @ 4 V) and fast switching support operation in DC-DC converters above 100 kHz.

The device exhibits defined polarity via cathode band marking, pure tin-plated leads compliant with J-STD-002 solderability, and meets JESD201 Class 2 whisker resistance. It is not AEC-Q101 qualified unless marked with "H" suffix (e.g., UF4004H).

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum non-repetitive reverse blocking voltage; sets upper limit for input/output isolation in flyback or boost topologies
t_rr	50 ns - Ultrafast recovery enables reduced switching losses in SMPS operating >100 kHz
V_F	1.0 V @ 1 A - Low conduction loss improves efficiency in 1 A continuous-output power stages
I_FSM	30 A - Withstands short-duration inrush/surge events without degradation
R_θJL	15 °C/W - Enables direct heat transfer to PCB copper pour or lead frame for thermal management
C_J	17 pF @ 1 MHz, 4 V - Minimizes capacitive coupling noise in high dv/dt environments

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, glass-passivated, cathode-indicated by band. Weight ≈ 0.330 g. UL 94V-0 molding compound.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry point during forward conduction	Connected to lower-potential node (e.g., switch node in buck converter, transformer secondary center-tap)
Cathode	Current exit point during forward conduction; reverse-blocking terminal	Marked with band; tied to output rail or ground return path; determines polarity of rectified output

Key Features

Feature	Design Value
Glass-passivated junction	Enables reliable operation at T_J = 150 °C and prevents moisture-induced degradation in humid environments
Ultrafast 50 ns recovery	Reduces reverse recovery charge (Q_rr) and associated switching losses vs. standard rectifiers
Pure tin-plated leads	Ensures consistent solder wetting and joint integrity per J-STD-002, eliminating lead-free compatibility concerns
RoHS & halogen-free compliance	Meets IEC 61249-2-21 for environmentally constrained industrial and consumer end equipment

Applications

DC-DC Converter Output Rectification	Switch-Mode Power Supply Freewheeling
Use Scenario: Secondary-side rectification in isolated 12 V/1 A flyback or forward converter powering industrial control logic. IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; conducts only during positive half-cycle of secondary voltage. Use Value: 1.0 V V_F minimizes conduction loss; 50 ns t_rr suppresses ringing and EMI during turn-off transitions.	Use Scenario: Freewheeling path across inductive load (e.g., solenoid driver or motor winding) in automotive body control module. IC Role / Device Role / Timing Role: Provides low-impedance return path for inductor current when main switch turns off; clamps inductive kickback voltage. Use Value: 400 V V_RRM safely absorbs 300 V transients; 30 A I_FSM handles peak inrush without failure.
AC-DC Adapter Secondary Rectifier	High-Frequency Inverter Output Stage
Use Scenario: Output rectification in compact 5 V/1 A wall adapter using quasi-resonant topology. IC Role / Device Role / Timing Role: Converts high-frequency transformer output (≈65–130 kHz) to DC; operates in continuous conduction mode. Use Value: 17 pF C_J limits displacement current; DO-41 package fits tight pitch layouts on cost-sensitive consumer PCBs.	Use Scenario: Output stage in 400 W solar microinverter DC link section handling 20 kHz PWM switching. IC Role / Device Role / Timing Role: Synchronizes with complementary MOSFET to steer current bidirectionally while blocking reverse voltage. Use Value: 15 °C/W R_θJL allows direct thermal coupling to heatsinked copper; 150 °C T_JMAX supports derated operation in enclosed enclosures.

DC-DC Converter Output Rectification

Switch-Mode Power Supply Freewheeling

Use Scenario: Secondary-side rectification in isolated 12 V/1 A flyback or forward converter powering industrial control logic.

IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; conducts only during positive half-cycle of secondary voltage.

Use Value: 1.0 V V_F minimizes conduction loss; 50 ns t_rr suppresses ringing and EMI during turn-off transitions.

Use Scenario: Freewheeling path across inductive load (e.g., solenoid driver or motor winding) in automotive body control module.

IC Role / Device Role / Timing Role: Provides low-impedance return path for inductor current when main switch turns off; clamps inductive kickback voltage.

Use Value: 400 V V_RRM safely absorbs 300 V transients; 30 A I_FSM handles peak inrush without failure.

AC-DC Adapter Secondary Rectifier

High-Frequency Inverter Output Stage

Use Scenario: Output rectification in compact 5 V/1 A wall adapter using quasi-resonant topology.

IC Role / Device Role / Timing Role: Converts high-frequency transformer output (≈65–130 kHz) to DC; operates in continuous conduction mode.

Use Value: 17 pF C_J limits displacement current; DO-41 package fits tight pitch layouts on cost-sensitive consumer PCBs.

Use Scenario: Output stage in 400 W solar microinverter DC link section handling 20 kHz PWM switching.

IC Role / Device Role / Timing Role: Synchronizes with complementary MOSFET to steer current bidirectionally while blocking reverse voltage.

Use Value: 15 °C/W R_θJL allows direct thermal coupling to heatsinked copper; 150 °C T_JMAX supports derated operation in enclosed enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04U (STMicroelectronics)	V_RRM = 400 V, t_rr = 35 ns, V_F = 1.15 V @ 1 A, DO-41 package	Lower t_rr reduces switching loss but higher V_F increases conduction loss at full load	Select when priority is minimizing EMI/noise over conduction efficiency
1N4934 (ON Semiconductor)	V_RRM = 400 V, t_rr = 200 ns, V_F = 1.2 V @ 1 A, DO-41 package	Slower recovery increases switching loss and limits usable frequency to ≤50 kHz	Select only for legacy designs where cost outweighs efficiency and frequency requirements

Compared with STTH1R04U and 1N4934, the UF4004 A0G delivers balanced performance: 50 ns t_rr enables efficient 100+ kHz operation without excessive V_F penalty, making it optimal for mid-range SMPS where thermal and EMI constraints coexist.

Availability

UF4004 A0G is available at Aetrix Electronics and suitable for DC-DC converters, switching-mode power supplies, and freewheeling applications requiring stable component supply, consistent DO-41 form factor, and verified 400 V/1 A ultrafast rectification performance.

Supply support for UF4004 A0G 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 power rectifiers, TVS diodes, and MOSFETs for industrial and consumer markets.

The UF400x series was developed specifically for high-efficiency, high-frequency switching power conversion, emphasizing low V_F, fast t_rr, and robust thermal performance in cost-sensitive through-hole applications.

FAQ

What is the maximum junction temperature rating for UF4004 A0G?

The UF4004 A0G has a maximum junction temperature (T_J) of +150 °C, validated under continuous forward current and transient surge conditions. This rating allows reliable operation in enclosed power supplies and industrial environments where ambient temperatures exceed 85 °C, provided thermal design accounts for R_θJL = 15 °C/W and board-level copper area.

Is UF4004 A0G AEC-Q101 qualified?

No, UF4004 A0G is not AEC-Q101 qualified. Only variants marked with the "H" suffix (e.g., UF4004H) meet AEC-Q101 stress test requirements for automotive under-hood applications. The "A0G" suffix indicates green, halogen-free packaging in ammo box format-no qualification upgrade is implied.

What does the "A0G" suffix mean in UF4004 A0G?

The "A0G" suffix denotes two attributes: "A0" specifies ammo box packaging (3,000 units per box), and "G" indicates halogen-free, RoHS-compliant molding compound per IEC 61249-2-21. It does not indicate voltage grade, temperature rating, or qualification status-those are defined by the base part number UF4004.

How does UF4004 A0G differ from UF4007 in terms of electrical performance?

UF4004 A0G and UF4007 share identical package, forward characteristics (I_F = 1 A, V_F = 1.0 V), and thermal specs, but differ in reverse voltage rating: UF4004 A0G has V_RRM = 400 V, while UF4007 has V_RRM = 1000 V. Their t_rr also differs-50 ns for UF4004 A0G vs. 75 ns for UF4007-due to optimized doping profiles for respective voltage classes.

Can UF4004 A0G replace UF4004 in an existing design?

Yes, UF4004 A0G is a direct form-fit-function replacement for UF4004 in DO-41 socketed or through-hole layouts. Both share identical electrical specs, package dimensions, polarity marking, and thermal performance. The "A0G" suffix adds halogen-free compliance and ammo box packaging but does not alter device behavior or reliability.

UF4004 A0G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

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

Packaging:: Tape & Box (TB)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 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:: 5 µA @ 400 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

UF4004 A0G FAQ

1.How can I place an order for UF4004 A0G through Aetrix?

Please submit a Request for Quotation (RFQ) for UF4004 A0G 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 UF4004 A0G reliable?

The price and inventory of UF4004 A0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UF4004 A0G is usually 5 days.

3.What payment methods are accepted for UF4004 A0G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UF4004 A0G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UF4004 A0G?

UF4004 A0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UF4004 A0G 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 UF4004 A0G?

For technical support, including UF4004 A0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UF4004 A0G requirements.

6.How does Aetrix verify that UF4004 A0G is sourced from the original manufacturer or authorized distributors?

All UF4004 A0G 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 UF4004 A0G meets industry standards.

7.What is the process for return or replacement of UF4004 A0G?

All UF4004 A0G units undergo pre-shipment inspection (PSI). If there is an issue with UF4004 A0G, 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 UF4004 A0G part is unused and in its original packaging.

Return procedure for UF4004 A0G:

1.Submit a request within 90 days.

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

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