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

Taiwan Semiconductor Corporation UF4004H

Name: UF4004H
Brand: Taiwan Semiconductor Corporation
SKU: UF4004H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UF4004H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: UF4004H.pdf

Description:: DIODE GEN PURP 400V 1A DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:5,000

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Product details

Overview

UF4004H from Taiwan Semiconductor is an AEC-Q101 qualified ultrafast recovery rectifier diode in DO-204AL (DO-41) 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) at I_F = 0.5 A. It delivers low 1.0 V forward voltage at 1 A and 25°C, enabling high-efficiency operation in DC-DC converters and switching inverters.

For engineers reviewing the UF4004H datasheet, UF4004H pinout, UF4004H application, or UF4004H equivalent, key selection criteria include its AEC-Q101 qualification, 400 V V_RRM, 50 ns t_rr, 1.0 V V_F @ 1 A, and DO-41 mechanical compatibility with legacy through-hole layouts.

Technical Context

The UF4004H employs a glass passivated silicon junction optimized for high-temperature switching stability up to 150°C junction temperature. Its ultrafast recovery (50 ns) minimizes switching losses in high-frequency SMPS topologies where diode reverse recovery dominates conduction loss.

Designed as a single-die, unidirectional rectifier, it features pure tin-plated leads compliant with J-STD-002 solderability and meets JESD201 Class 2 whisker resistance. Polarity is marked by a cathode band on the DO-41 body.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum non-repetitive reverse blocking voltage before breakdown; defines usable input voltage range in flyback or boost stages.
I_F	1 A continuous - Average forward current rating at 75°C lead temperature; sets thermal derating baseline for PCB trace design.
t_rr	50 ns - Measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables operation up to ~2 MHz switching frequency with low EMI.
V_F	1.0 V @ 1 A, 25°C - Forward voltage drop directly impacts conduction loss and thermal rise in high-duty-cycle applications.
I_FSM	30 A - Non-repetitive surge current capability (8.3 ms half-sine); supports inrush current handling in offline AC-DC inputs.
R_θJL	15 °C/W - Junction-to-lead thermal resistance; enables direct thermal coupling to copper pour or heatsink via lead soldering.
C_J	17 pF @ 1 MHz, 4 V - Junction capacitance affects high-frequency noise coupling and snubber design in resonant converters.

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case with cathode band marking. Lead finish: pure tin, RoHS and halogen-free compliant.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Forward current entry terminal	Connected to lower-potential side of circuit (e.g., switch node in buck converter); requires adequate trace width for 1 A continuous flow.
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to higher-potential rail (e.g., output capacitor positive); cathode band must align with PCB silkscreen polarity indicator.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive powertrain and chassis applications requiring reliability under temperature cycling, vibration, and humidity stress.
Glass passivated junction	Enhances moisture resistance and long-term parameter stability in humid or condensing environments (e.g., under-hood modules).
Ultrafast 50 ns recovery	Reduces reverse recovery charge (Q_rr) and associated switching losses in >100 kHz SMPS designs, improving efficiency over standard rectifiers.
Low 1.0 V forward voltage	Lowers conduction loss by ~15% vs. comparable 1A rectifiers with V_F ≥ 1.15 V, reducing thermal load on PCB copper area.
DO-41 mechanical compatibility	Enables drop-in replacement in existing through-hole layouts designed for 1N400x or UF400x series without footprint redesign.

Applications

Automotive DC-DC Converters	Industrial Switch-Mode Inverters
Use Scenario: 12 V to 48 V bidirectional DC-DC converter in 48 V mild hybrid vehicle architecture. IC Role / Device Role / Timing Role: Output freewheeling rectifier in synchronous buck topology, conducting during low-side MOSFET off-time. Use Value: AEC-Q101 qualification ensures reliability across -40°C to +125°C ambient; 50 ns t_rr prevents cross-conduction loss during dead-time transitions.	Use Scenario: Auxiliary power supply in variable-frequency drive (VFD) control board converting 3-phase rectified bus to isolated 15 V logic rail. IC Role / Device Role / Timing Role: Secondary-side output rectifier in flyback converter operating at 250 kHz switching frequency. Use Value: Low 1.0 V V_F reduces heat generation in confined enclosure; DO-41 leads allow manual rework and conformal coating compatibility.
Consumer Power Adapters	LED Driver Freewheeling
Use Scenario: Compact 65 W USB-C PD adapter using quasi-resonant flyback with secondary-side synchronous rectification disabled. IC Role / Device Role / Timing Role: Primary-side snubber clamp diode and secondary-side output rectifier in dual-role configuration. Use Value: 400 V V_RRM safely handles reflected flyback spikes up to 350 V; 30 A I_FSM withstands startup surges without degradation.	Use Scenario: Constant-current LED driver for street lighting using buck-boost topology with inductive energy recycling. IC Role / Device Role / Timing Role: Freewheeling path for inductor current during MOSFET off-period, preventing voltage overshoot across switching element. Use Value: Ultrafast 50 ns recovery eliminates voltage ringing that could trigger false overvoltage protection; 17 pF C_J minimizes capacitive coupling into analog feedback loop.

Automotive DC-DC Converters

Industrial Switch-Mode Inverters

Use Scenario: 12 V to 48 V bidirectional DC-DC converter in 48 V mild hybrid vehicle architecture.

IC Role / Device Role / Timing Role: Output freewheeling rectifier in synchronous buck topology, conducting during low-side MOSFET off-time.

Use Value: AEC-Q101 qualification ensures reliability across -40°C to +125°C ambient; 50 ns t_rr prevents cross-conduction loss during dead-time transitions.

Use Scenario: Auxiliary power supply in variable-frequency drive (VFD) control board converting 3-phase rectified bus to isolated 15 V logic rail.

IC Role / Device Role / Timing Role: Secondary-side output rectifier in flyback converter operating at 250 kHz switching frequency.

Use Value: Low 1.0 V V_F reduces heat generation in confined enclosure; DO-41 leads allow manual rework and conformal coating compatibility.

Consumer Power Adapters

LED Driver Freewheeling

Use Scenario: Compact 65 W USB-C PD adapter using quasi-resonant flyback with secondary-side synchronous rectification disabled.

IC Role / Device Role / Timing Role: Primary-side snubber clamp diode and secondary-side output rectifier in dual-role configuration.

Use Value: 400 V V_RRM safely handles reflected flyback spikes up to 350 V; 30 A I_FSM withstands startup surges without degradation.

Use Scenario: Constant-current LED driver for street lighting using buck-boost topology with inductive energy recycling.

IC Role / Device Role / Timing Role: Freewheeling path for inductor current during MOSFET off-period, preventing voltage overshoot across switching element.

Use Value: Ultrafast 50 ns recovery eliminates voltage ringing that could trigger false overvoltage protection; 17 pF C_J minimizes capacitive coupling into analog feedback loop.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04	Same 400 V V_RRM, 1 A I_F, but 35 ns t_rr; TO-220AC package (not DO-41)	Requires PCB footprint change and heatsinking; better for higher thermal loads (>1.5 A avg)	Select when lower t_rr is critical and surface-mount or heatsink integration is feasible.
ON Semi MUR140	400 V V_RRM, 1 A I_F, 50 ns t_rr, same DO-41 package; not AEC-Q101 qualified	Not suitable for automotive under-hood use; identical mechanical fit for industrial/white goods	Choose for cost-sensitive non-automotive designs where AEC-Q101 is not mandated.

Compared with STTH1R04 and MUR140, the UF4004H uniquely combines AEC-Q101 qualification, DO-41 form factor, and 50 ns recovery-making it the only drop-in solution for automotive-grade through-hole ultrafast rectification without layout or thermal redesign.

Availability

UF4004H is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial switch-mode inverters, and LED driver freewheeling applications requiring stable component supply, long-lifecycle support, and AEC-Q101 compliance.

Supply support for UF4004H 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 semiconductor manufacturer specializing in discrete power devices, including rectifiers, transistors, and TVS diodes, with global distribution and automotive qualification capabilities.

The UF400x family was developed to deliver AEC-Q101-compliant ultrafast rectification in standard DO-41 packaging for cost-sensitive yet reliability-critical automotive and industrial power conversion systems.

FAQ

What does the "H" suffix in UF4004H signify?

The "H" suffix in UF4004H indicates full AEC-Q101 qualification per Rev D standards, covering stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing. This certification is documented in Taiwan Semiconductor's official qualification report for UF4004H and distinguishes it from non-H variants like UF4004.

Is UF4004H pin-compatible with UF4004?

Yes, UF4004H is mechanically and electrically identical to UF4004 in DO-41 package, with identical pinout (anode/cathode), dimensions, and all electrical parameters except AEC-Q101 qualification. No PCB changes are required when upgrading from UF4004 to UF4004H in automotive or industrial designs.

What is the maximum operating junction temperature for UF4004H?

The maximum rated junction temperature (T_J_MAX) for UF4004H is +150°C, consistent across all UF400x variants. Derating begins above 75°C lead temperature, and thermal design must ensure R_θJL = 15°C/W and R_θJA = 60°C/W limits are respected to maintain reliability.

Does UF4004H meet halogen-free requirements?

Yes, UF4004H uses molding compound compliant with IEC 61249-2-21 for halogen-free status, confirmed in Taiwan Semiconductor's material declaration P2104. Total bromine and chlorine content is below 900 ppm each, satisfying RoHS and major automotive OEM green material specifications.

Can UF4004H replace 1N4004 in high-frequency designs?

No-UF4004H is not a direct replacement for 1N4004 in high-frequency applications. While both share DO-41 packaging, 1N4004 has 2 µs recovery time versus UF4004H's 50 ns. Using UF4004H instead improves efficiency and EMI in SMPS >50 kHz, but substituting 1N4004 for UF4004H causes excessive switching loss and potential failure.

UF4004H 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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Through Hole

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

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

UF4004H FAQ

1.How can I place an order for UF4004H through Aetrix?

Please submit a Request for Quotation (RFQ) for UF4004H 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 UF4004H reliable?

The price and inventory of UF4004H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UF4004H is usually 5 days.

3.What payment methods are accepted for UF4004H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UF4004H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UF4004H?

UF4004H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UF4004H 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 UF4004H?

For technical support, including UF4004H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UF4004H requirements.

6.How does Aetrix verify that UF4004H is sourced from the original manufacturer or authorized distributors?

All UF4004H 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 UF4004H meets industry standards.

7.What is the process for return or replacement of UF4004H?

All UF4004H units undergo pre-shipment inspection (PSI). If there is an issue with UF4004H, 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 UF4004H part is unused and in its original packaging.

Return procedure for UF4004H:

1.Submit a request within 90 days.

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

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