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

Taiwan Semiconductor Corporation UF1A R0G

Name: UF1A R0G
Brand: Taiwan Semiconductor Corporation
SKU: UF1A R0G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UF1A R0G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: UF1A R0G.pdf

Description:: DIODE GEN PURP 50V 1A DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:9,486

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Product details

Overview

UF1A R0G from Taiwan Semiconductor is a 1 A, 50 V repetitive peak reverse voltage (V_RRM) glass-passivated high-efficiency rectifier diode in DO-204AL (DO-41) package, featuring soft recovery (t_rr ≤ 50 ns), 1.0 V forward voltage at 1 A/25°C, and 150°C maximum junction temperature - used in DC-DC converters and freewheeling paths.

For engineers reviewing the UF1A R0G datasheet, UF1A R0G pinout, UF1A R0G application, or UF1A R0G equivalent, key selection criteria include its 30 A surge rating (I_FSM), 15 °C/W junction-to-lead thermal resistance, RoHS/halogen-free compliance, AEC-Q101 qualification option (UF1A H variants), and cathode-band polarity marking.

Technical Context

This discrete silicon rectifier uses a single-die planar structure with glass passivation for stable high-temperature operation up to 150°C junction temperature and robust surge handling (8.3 ms half-sine, 30 A). Its soft recovery behavior minimizes switching noise in high-frequency SMPS designs.

The device operates with low forward voltage drop (1.0 V typ. @ 1 A, 25°C) and ultra-low reverse leakage (5 µA max @ 25°C, rated V_R), supported by 17 pF junction capacitance at 1 MHz/4 V - enabling efficient performance in 50–500 kHz converter topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
I_F (Avg)	1 A continuous forward current - supports compact heatsink-free designs in low-power DC-DC stages
V_RRM	50 V repetitive peak reverse voltage - suitable for 24 V input systems with safety margin
t_rr	≤ 50 ns reverse recovery time - reduces switching losses and EMI in hard-switched converters
V_F @ 1 A, 25°C	1.0 V typical - lowers conduction loss vs. standard fast recovery diodes (e.g., 1.3 V)
R_θJL	15 °C/W junction-to-lead thermal resistance - enables direct PCB copper pour cooling without external heatsink
I_FSM	30 A non-repetitive surge current - withstands inrush and transient overloads in industrial power supplies

Pinout & Package

DO-204AL (DO-41) axial-leaded package with cathode band marking; leads are pure tin-plated per J-STD-002, UL 94V-0 molded compound, and JESD 201 Class 2 whisker compliant.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck freewheel path)
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to output rail; polarity band ensures correct orientation during manual or automated placement

Key Features

Feature	Design Value
Glass-passivated junction	Enables stable operation at 150°C TJ and improves long-term reliability under thermal cycling
Soft recovery characteristic	Reduces voltage overshoot and ringing during turn-off, easing EMI filter design
AEC-Q101 qualified variant available	Supports automotive-grade power modules requiring stress-tested discrete components
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and global environmental regulations for industrial and consumer products

Applications

DC-DC Converter Output Rectification	Switch-Mode Power Supply Freewheeling
Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering ≤12 W at 5–24 V output. IC Role / Device Role / Timing Role: Unidirectional current path that conducts during transformer reset phase and blocks reverse voltage during primary switch on-time. Use Value: 1.0 V V_F minimizes conduction loss; 50 ns t_rr limits switching loss and allows higher frequency operation than standard rectifiers.	Use Scenario: Freewheeling path across inductive loads in buck regulators or motor drivers operating at 100–300 kHz. IC Role / Device Role / Timing Role: Provides low-impedance return path for inductor current when main switch turns off, preventing voltage spikes. Use Value: Soft recovery suppresses voltage ringing; 30 A I_FSM handles peak inductor current surges without failure.
Industrial AC-DC Adapter Input Stage	Low-Power LED Driver Bridge Leg
Use Scenario: Input rectification in universal-input (85–265 VAC) offline adapters with <15 W output. IC Role / Device Role / Timing Role: Half-wave or full-wave rectifier in voltage doubler or bridge configuration, conducting only during positive half-cycles. Use Value: 50 V V_RRM provides sufficient margin for 35 V peak line voltage; 150°C T_JMAX supports enclosed thermal environments.	Use Scenario: One leg of a 4-diode bridge rectifier converting 12–24 VAC to DC for constant-current LED strings. IC Role / Device Role / Timing Role: Conducts during positive half-cycle of AC input; blocks reverse voltage during negative half-cycle. Use Value: Low V_F preserves efficiency in thermally constrained LED housings; DO-41 package fits standard through-hole footprints.

DC-DC Converter Output Rectification

Switch-Mode Power Supply Freewheeling

Use Scenario: Secondary-side rectification in isolated flyback or forward converters delivering ≤12 W at 5–24 V output.

IC Role / Device Role / Timing Role: Unidirectional current path that conducts during transformer reset phase and blocks reverse voltage during primary switch on-time.

Use Value: 1.0 V V_F minimizes conduction loss; 50 ns t_rr limits switching loss and allows higher frequency operation than standard rectifiers.

Use Scenario: Freewheeling path across inductive loads in buck regulators or motor drivers operating at 100–300 kHz.

IC Role / Device Role / Timing Role: Provides low-impedance return path for inductor current when main switch turns off, preventing voltage spikes.

Use Value: Soft recovery suppresses voltage ringing; 30 A I_FSM handles peak inductor current surges without failure.

Industrial AC-DC Adapter Input Stage

Low-Power LED Driver Bridge Leg

Use Scenario: Input rectification in universal-input (85–265 VAC) offline adapters with <15 W output.

IC Role / Device Role / Timing Role: Half-wave or full-wave rectifier in voltage doubler or bridge configuration, conducting only during positive half-cycles.

Use Value: 50 V V_RRM provides sufficient margin for 35 V peak line voltage; 150°C T_JMAX supports enclosed thermal environments.

Use Scenario: One leg of a 4-diode bridge rectifier converting 12–24 VAC to DC for constant-current LED strings.

IC Role / Device Role / Timing Role: Conducts during positive half-cycle of AC input; blocks reverse voltage during negative half-cycle.

Use Value: Low V_F preserves efficiency in thermally constrained LED housings; DO-41 package fits standard through-hole footprints.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-efficiency rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MUR105	Same 1 A / 50 V rating, but 35 ns t_rr and 1.15 V V_F; TO-220AC package (larger, higher thermal mass)	Preferred where lower t_rr is critical and board space permits larger footprint	Select MUR105 if faster recovery outweighs size and cost constraints
Vishay VS-1EWH05	1 A / 50 V, 50 ns t_rr, 0.95 V V_F, same DO-41 package; AEC-Q101 qualified as standard	Better suited for automotive front-end modules requiring certified reliability	Choose VS-1EWH05 when AEC-Q101 compliance is mandatory and V_F reduction is prioritized

Compared with UF1A R0G, MUR105 offers faster recovery but requires TO-220 layout changes and higher V_F, while VS-1EWH05 matches DO-41 form factor and improves V_F and qualification status - making it a drop-in upgrade for automotive designs.

Availability

UF1A R0G is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for UF1A R0G 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 industrial, computing, and consumer markets since 1979.

The UF1A R0G belongs to TSC's UF1x high-efficiency rectifier family, designed specifically for high-frequency switching power supplies where low forward voltage, soft recovery, and thermal robustness are essential.

FAQ

What is the maximum junction temperature rating for UF1A R0G?

The UF1A R0G has a maximum junction temperature (T_JMAX) of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet (Version G2104). This rating enables reliable operation in enclosed industrial enclosures or near heat-generating components without forced airflow. Derating curves confirm usable current capacity down to 0.5 A at 125°C ambient, assuming adequate PCB copper thermal relief.

Does UF1A R0G have AEC-Q101 qualification?

The base UF1A R0G is not AEC-Q101 qualified; however, the pin-compatible UF1A H variant (e.g., UF1A HA0G) is explicitly qualified per AEC-Q101 Rev D. The "H" suffix denotes automotive qualification, including extended temperature cycling, high-temperature operating life, and mechanical shock testing. For automotive use, specify the H-suffix version - UF1A R0G itself meets industrial reliability standards but lacks formal automotive certification.

What is the reverse recovery time (t_rr) specification for UF1A R0G?

The UF1A R0G has a maximum reverse recovery time (t_rr) of 50 ns, measured at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A, per the Electrical Specifications table in the Taiwan Semiconductor UF1x datasheet (G2104). This soft-recovery characteristic reduces switching noise and voltage overshoot compared to standard fast recovery diodes, supporting cleaner operation in 200–500 kHz SMPS designs.

Is UF1A R0G halogen-free and RoHS compliant?

Yes, UF1A R0G is both RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the Features section of the official Taiwan Semiconductor datasheet (G2104). The molding compound contains no brominated flame retardants or chlorine-based additives, and lead content is below 1000 ppm. Full compliance documentation is available upon request from Aetrix Electronics for audit or certification purposes.

What packaging options are available for UF1A R0G?

UF1A R0G is supplied in DO-204AL (DO-41) package with two standard packing formats: 5,000 units per tape-and-reel (standard for SMT assembly) and 3,000 units per ammo box (for manual or selective soldering). The "R0G" suffix indicates green compound (halogen-free) and standard industrial grade; ordering codes follow the pattern UF1A R0G (tape) or UF1A A0G (ammo). No tray or bulk options are offered for this variant.

UF1A R0G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

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:: 5 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

UF1A R0G FAQ

1.How can I place an order for UF1A R0G through Aetrix?

Please submit a Request for Quotation (RFQ) for UF1A R0G 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 UF1A R0G reliable?

The price and inventory of UF1A R0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UF1A R0G is usually 5 days.

3.What payment methods are accepted for UF1A R0G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UF1A R0G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UF1A R0G?

UF1A R0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UF1A R0G 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 UF1A R0G?

For technical support, including UF1A R0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UF1A R0G requirements.

6.How does Aetrix verify that UF1A R0G is sourced from the original manufacturer or authorized distributors?

All UF1A R0G 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 UF1A R0G meets industry standards.

7.What is the process for return or replacement of UF1A R0G?

All UF1A R0G units undergo pre-shipment inspection (PSI). If there is an issue with UF1A R0G, 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 UF1A R0G part is unused and in its original packaging.

Return procedure for UF1A R0G:

1.Submit a request within 90 days.

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

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