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

Taiwan Semiconductor Corporation UF4004 R1G

Name: UF4004 R1G
Brand: Taiwan Semiconductor Corporation
SKU: UF4004 R1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UF4004 R1G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: UF4004 R1G.pdf

Description:: DIODE GEN PURP 400V 1A DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:9,487

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Product details

Overview

UF4004 R1G 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; used in switching-mode power supplies and freewheeling paths where fast switching and low conduction loss are critical.

For engineers reviewing the UF4004 R1G datasheet, UF4004 R1G pinout, UF4004 R1G application, or UF4004 R1G equivalent, key selection criteria include V_RRM = 400 V, t_rr ≤ 50 ns, I_F = 1 A continuous, thermal resistance R_θJL = 15 °C/W, and AEC-Q101 qualification availability (R1G denotes standard grade, not AEC-Q101).

Technical Context

This discrete silicon PN junction rectifier employs glass passivated chip construction for high-temperature reliability and stable switching performance. Its ultrafast recovery (t_rr ≤ 50 ns) enables efficient operation in high-frequency DC–DC converters up to several hundred kHz.

The device operates with a maximum junction temperature of 150 °C and exhibits low forward voltage (V_F = 1.0 V @ I_F = 1 A, T_J = 25 °C) and low leakage (I_R ≤ 5 µA @ V_R = 400 V, T_J = 25 °C), supporting thermally constrained designs in compact power stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum repetitive peak reverse voltage; defines safe blocking capability in 400 V-rated circuits
t_rr	50 ns - Ultrafast reverse recovery time; minimizes switching losses in high-frequency SMPS (>100 kHz)
V_F	1.0 V @ 1 A - Low forward voltage drop; reduces conduction loss and thermal stress at full rated current
I_FSM	30 A - Non-repetitive surge current rating; supports inrush and transient overload handling
R_θJL	15 °C/W - Junction-to-lead thermal resistance; enables direct heatsinking via PCB copper or lead frame
I_R	5 µA @ 400 V - Low reverse leakage at rated voltage; preserves efficiency in high-impedance bias networks

Pinout & Package

Package: DO-204AL (DO-41), axial leaded, glass-passivated silicon die, cathode indicated by band. Lead finish: pure tin, J-STD-002 solderable.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Current entry terminal during forward conduction	Connected to lower-potential side (e.g., switch node or ground return) in freewheeling or output rectification
Cathode (banded end)	Current exit terminal during forward conduction; reverse-blocking terminal	Connected to higher-potential rail (e.g., output capacitor positive or switching node) to enable unidirectional current flow

Key Features

Feature	Design Value
Glass passivated junction	Enhances moisture resistance and long-term reliability under thermal cycling and humid environments
Ultrafast 50 ns recovery	Reduces reverse recovery charge (Q_rr) and associated switching losses in high-frequency topologies
150 °C max junction temperature	Supports operation in sealed enclosures or high-ambient industrial environments without derating
RoHS & halogen-free compliance	Meets IEC 61249-2-21 and environmental regulations for consumer, industrial, and automotive supply chains

Applications

DC–DC Converters	Switching Inverters
Use Scenario: Secondary-side synchronous or diode rectification in isolated flyback or forward converters operating at 100–500 kHz. IC Role / Device Role / Timing Role: Output rectifier providing unidirectional current flow and energy transfer to output capacitor. Use Value: 50 ns t_rr and 1.0 V V_F jointly reduce total power loss, improving efficiency by ~0.8% over standard fast rectifiers at 1 A load.	Use Scenario: Freewheeling path across inductive loads (e.g., motor windings or transformer leakage inductance) in H-bridge inverters. IC Role / Device Role / Timing Role: Clamp diode enabling safe current recirculation during PWM dead-time and switch turn-off transitions. Use Value: Low Q_rr and fast t_rr minimize voltage overshoot and EMI generation during inductive kickback events.
AC–DC Adapters	Industrial Power Supplies
Use Scenario: Output rectification in compact 12–24 V, 1 A AC–DC adapters for networking and IoT equipment. IC Role / Device Role / Timing Role: Primary output rectifier converting high-frequency transformer secondary AC to regulated DC. Use Value: DO-41 package allows manual or automated through-hole assembly; 0.33 g weight supports lightweight portable design constraints.	Use Scenario: Input-stage bridge rectification or auxiliary supply rectification in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: High-reliability rectifier handling continuous 1 A load with intermittent surges up to 30 A. Use Value: 150 °C T_JMAX and JESD201 Class 2 whisker resistance ensure stable operation over 10+ year field life in industrial ambient conditions.

DC–DC Converters

Switching Inverters

Use Scenario: Secondary-side synchronous or diode rectification in isolated flyback or forward converters operating at 100–500 kHz.

IC Role / Device Role / Timing Role: Output rectifier providing unidirectional current flow and energy transfer to output capacitor.

Use Value: 50 ns t_rr and 1.0 V V_F jointly reduce total power loss, improving efficiency by ~0.8% over standard fast rectifiers at 1 A load.

Use Scenario: Freewheeling path across inductive loads (e.g., motor windings or transformer leakage inductance) in H-bridge inverters.

IC Role / Device Role / Timing Role: Clamp diode enabling safe current recirculation during PWM dead-time and switch turn-off transitions.

Use Value: Low Q_rr and fast t_rr minimize voltage overshoot and EMI generation during inductive kickback events.

AC–DC Adapters

Industrial Power Supplies

Use Scenario: Output rectification in compact 12–24 V, 1 A AC–DC adapters for networking and IoT equipment.

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

Use Value: DO-41 package allows manual or automated through-hole assembly; 0.33 g weight supports lightweight portable design constraints.

Use Scenario: Input-stage bridge rectification or auxiliary supply rectification in programmable logic controller (PLC) power modules.

IC Role / Device Role / Timing Role: High-reliability rectifier handling continuous 1 A load with intermittent surges up to 30 A.

Use Value: 150 °C T_JMAX and JESD201 Class 2 whisker resistance ensure stable operation over 10+ year field life in industrial ambient conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04	V_RRM = 400 V, t_rr = 35 ns, V_F = 1.15 V @ 1 A - faster but higher V_F; TO-220AC package	Requires PCB footprint change and thermal pad layout; better for >200 kHz designs needing lowest Q_rr	Select when minimizing reverse recovery loss outweighs board space and thermal design complexity
ON Semi MUR140	V_RRM = 400 V, t_rr = 50 ns, V_F = 0.98 V @ 1 A - near-identical speed, slightly lower V_F; same DO-41 package	No layout change required; RoHS-compliant but not halogen-free per IEC 61249-2-21	Preferred for drop-in replacement where halogen-free requirement is not mandated

Compared with STTH1R04 and MUR140, the UF4004 R1G offers balanced trade-offs: identical t_rr to MUR140 with halogen-free assurance, and lower thermal resistance than STTH1R04 in a compact axial package-ideal for cost-sensitive, space-constrained industrial adapters.

Availability

UF4004 R1G is available at Aetrix Electronics and suitable for DC–DC converters, switching inverters, and industrial power supplies requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for UF4004 R1G 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 industrial, computing, and consumer markets since 1979.

The UF400x series belongs to TSC's high-efficiency rectifier product line, engineered specifically for high-frequency switching power conversion where low V_F, fast t_rr, and robust thermal performance are essential.

FAQ

What is the maximum junction temperature rating for UF4004 R1G?

The UF4004 R1G has a maximum junction temperature (T_J) of +150 °C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet P2104. This allows reliable operation in enclosed industrial enclosures or high-ambient environments without forced cooling, provided thermal design respects R_θJL = 15 °C/W and R_θJA = 60 °C/W limits. Derating curves confirm 1 A continuous current is sustainable up to 125 °C ambient with adequate PCB copper.

Does UF4004 R1G meet AEC-Q101 qualification?

No, UF4004 R1G is the standard-grade version; AEC-Q101 qualification is only available for variants marked with "H" suffix (e.g., UF4004H). The R1G marking indicates green compound, tape-and-reel packaging (5,000 pcs), and non-automotive grade. For automotive applications requiring AEC-Q101, specify UF4004H instead of UF4004 R1G.

What is the reverse recovery time (t_rr) of UF4004 R1G and how is it measured?

The UF4004 R1G has a maximum reverse recovery time (t_rr) of 50 ns, tested under conditions: I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A, per the official Taiwan Semiconductor P2104 datasheet. This value applies specifically to the UF4001–UF4004 subgroup and reflects performance at 25 °C junction temperature; t_rr increases modestly at elevated temperatures but remains < 70 ns at 125 °C.

Is UF4004 R1G halogen-free and RoHS compliant?

Yes, UF4004 R1G is both RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the "Features" section of the Taiwan Semiconductor P2104 datasheet. The molding compound contains no brominated or chlorinated flame retardants, and the pure tin lead finish meets J-STD-002 solderability requirements-making it suitable for environmentally regulated consumer and industrial end products.

What does the "R1G" suffix mean in UF4004 R1G?

The "R1G" suffix in UF4004 R1G indicates: "R1" = tape-and-reel packaging (5,000 units per reel), and "G" = green (halogen-free) molding compound. It does not denote AEC-Q101 qualification (which requires "H") or special screening. This marking aligns with Taiwan Semiconductor's ordering code convention in the P2104 datasheet, confirming standard industrial-grade reliability and environmental compliance.

UF4004 R1G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

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

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 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 R1G FAQ

1.How can I place an order for UF4004 R1G through Aetrix?

Please submit a Request for Quotation (RFQ) for UF4004 R1G 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 R1G reliable?

The price and inventory of UF4004 R1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UF4004 R1G is usually 5 days.

3.What payment methods are accepted for UF4004 R1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UF4004 R1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UF4004 R1G?

UF4004 R1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UF4004 R1G 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 R1G?

For technical support, including UF4004 R1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UF4004 R1G requirements.

6.How does Aetrix verify that UF4004 R1G is sourced from the original manufacturer or authorized distributors?

All UF4004 R1G 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 R1G meets industry standards.

7.What is the process for return or replacement of UF4004 R1G?

All UF4004 R1G units undergo pre-shipment inspection (PSI). If there is an issue with UF4004 R1G, 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 R1G part is unused and in its original packaging.

Return procedure for UF4004 R1G:

1.Submit a request within 90 days.

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

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