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

Diodes Incorporated UF1003-T

Name: UF1003-T
Brand: Diodes Incorporated
SKU: UF1003-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UF1003-T

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

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

Datasheet:: UF1003-T.pdf

Description:: DIODE GEN PURP 200V 1A DO41

Quantity:: RFQ Add To RFQ list

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Inventory:20,153

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Product details

Overview

UF1003-T from Diodes Incorporated is an ultra-fast recovery rectifier diode with 200 V peak repetitive reverse voltage, 1.0 A average forward current at 55°C, and 50 ns reverse recovery time. It features low forward voltage drop (1.3 V @ 1.0 A), low reverse leakage (5.0 µA @ 25°C), and DO-41 plastic package for high-efficiency AC/DC front-end and switching power supply applications.

For engineers reviewing the UF1003-T datasheet, UF1003-T pinout, UF1003-T application, or UF1003-T equivalent, key selection criteria include reverse recovery speed for EMI-sensitive SMPS, thermal resistance (95 K/W) for board-level thermal design, and surge rating (30 A @ 8.3 ms) for line transient robustness.

Technical Context

This device uses a diffused junction process to achieve ultra-fast switching performance, enabling efficient operation in high-frequency rectification up to several hundred kHz. Its 50 ns trr and low Qrr support reduced switching losses in flyback and boost converters.

The DO-41 package provides mechanical robustness and standard through-hole mounting compatibility, while the cathode band marking ensures unambiguous polarity identification during manual or automated assembly.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RWM	200 V - Maximum continuous reverse working voltage before breakdown; sets minimum input stage isolation margin in 115/230 VAC systems.
I_O @ T_A = 55°C	1.0 A - Average rectified output current under defined thermal condition; determines usable DC output capability in half-wave or full-wave bridge configurations.
t_rr	50 ns - Reverse recovery time measured per JEDEC method; directly impacts switching loss and EMI generation in high-frequency SMPS.
V_F @ I_F = 1.0 A	1.3 V - Forward voltage drop at rated DC current; defines conduction loss and thermal load in continuous operation.
I_FSM	30 A - Non-repetitive peak surge current (8.3 ms half-sine); supports robustness against AC line surges and inrush events.
R_JA	95 K/W - Junction-to-ambient thermal resistance; used to calculate junction temperature rise with PCB copper area and airflow assumptions.

Pinout & Package

DO-41 molded plastic package with axial leads; cathode identified by a painted band on the body. Standard through-hole mounting with no polarity-sensitive footprint.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Forward current entry point	Connects to AC source or transformer secondary; must withstand peak inverse voltage during off-state.
Cathode (banded end)	Forward current exit point / reverse blocking terminal	Connects to output capacitor or load; carries full DC output current and defines reference node for downstream regulation.

Key Features

Feature	Design Value
Ultra-fast recovery	50 ns t_rr enables high-frequency operation (>100 kHz) with minimal switching loss and EMI.
Low forward voltage	1.3 V @ 1.0 A reduces conduction loss and improves efficiency in low-voltage output stages.
High surge rating	30 A non-repetitive surge current supports reliable startup and line transient handling without derating.
UL 94V-0 flammability	Self-extinguishing plastic housing meets safety standards for enclosed power supplies and industrial equipment.

Applications

AC/DC Adapter Front-End

USB-C Power Delivery Input Stage

Use Scenario: Rectifying 50/60 Hz or high-frequency AC from transformer or PFC stage into DC bus for downstream regulation.

IC Role / Device Role / Timing Role: Primary-side unidirectional current path; blocks reverse current during negative half-cycle while conducting forward current with minimal loss.

Use Value: 50 ns t_rr limits reverse recovery ringing and EMI, critical for meeting CISPR-32 conducted emissions limits in compact adapters.

Use Scenario: Input rectification in multi-port USB-C PD chargers supporting 65 W+ output with universal AC input.

IC Role / Device Role / Timing Role: High-reliability AC input bridge leg; handles 30 A surge during hot-plug and brown-out recovery events.

Use Value: 200 V V_RWM provides sufficient margin for 264 VAC input with line spikes, while 1.3 V V_F minimizes heat buildup in thermally constrained PCB layouts.

Industrial PLC Power Supply

LED Driver Auxiliary Supply

Use Scenario: Providing isolated 12–24 V DC bias for control logic and communication interfaces in programmable logic controllers.

IC Role / Device Role / Timing Role: Secondary-side rectifier in flyback or forward converter; operates continuously under variable load and ambient temperature (-25°C to +70°C).

Use Value: -65°C to +150°C operating range ensures reliability across industrial temperature extremes without derating.

Use Scenario: Generating low-power auxiliary V_CC for LED driver ICs in constant-current streetlight or commercial lighting modules.

IC Role / Device Role / Timing Role: Half-wave rectifier feeding linear regulator or buck controller; requires stable low-leakage performance over life.

Use Value: 5.0 µA max reverse leakage at 25°C prevents standby current drift and maintains tight output regulation over 10-year field life.

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-fast rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R02	Same 200 V V_RWM, but 35 ns t_rr and 1.15 V V_F @ 1 A; TO-220AC package.	Requires heatsink for >0.5 A continuous use; unsuitable for space-constrained DO-41 footprints.	Select when lower trr and higher thermal mass are prioritized over board area and cost.
ES1D	200 V V_RWM, 35 ns t_rr, but only 1 A I_O @ 75°C; SMA package with 2x smaller footprint.	Lower thermal resistance (65 K/W) but limited surge rating (15 A I_FSM).	Select for surface-mount designs where layout density matters more than surge margin.

Compared with STTH1R02 and ES1D, UF1003-T offers optimal balance of DO-41 compatibility, 30 A surge robustness, and proven thermal performance in legacy and cost-sensitive industrial power supplies-without requiring redesign or thermal recalculations.

Availability

UF1003-T is available at Aetrix Electronics and suitable for AC/DC adapters, industrial PLC power supplies, LED driver auxiliary rails, and USB-C PD input stages requiring stable component supply and long-term manufacturability.

Supply support for UF1003-T 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The UF1001–UF1007 series targets cost-effective, high-reliability rectification in mainstream power conversion applications-from consumer adapters to industrial controls-emphasizing speed, surge tolerance, and thermal stability.

FAQ

What is the maximum allowable junction temperature for UF1003-T?

The absolute maximum junction temperature is +150°C, with storage temperature matching this range. Operation at full 1.0 A load requires maintaining ambient temperature ≤55°C or implementing adequate PCB copper pour and airflow to limit T_J rise below 150°C using R_JA = 95 K/W.

Can UF1003-T replace UF1002-T in a 100 V design?

No-UF1002-T is rated for 100 V V_RWM, while UF1003-T is rated for 200 V. Substituting UF1003-T in a 100 V design is electrically safe and may improve margin, but it does not reduce forward voltage (1.3 V vs. 1.0 V for UF1002-T) or improve thermal performance.

Is UF1003-T lead-free and RoHS compliant?

Yes-UF1003-T meets RoHS Directive 2011/65/EU and is manufactured with lead-free terminations. The device complies with JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and is compatible with standard SnPb and lead-free reflow profiles when mounted on PCBs.

How does UF1003-T perform under capacitive load conditions?

Per datasheet note, average forward current must be derated by 20% under capacitive loading due to increased peak current stress. At 55°C ambient, rated I_O drops from 1.0 A to 0.8 A to ensure reliable operation and avoid premature wear-out from ripple-induced heating.

UF1003-T Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 200 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 @ 200 V

Capacitance @ Vr, F:: 20pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-41

Operating Temperature - Junction:: -65°C ~ 150°C

UF1003-T FAQ

1.How can I place an order for UF1003-T through Aetrix?

Please submit a Request for Quotation (RFQ) for UF1003-T 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 UF1003-T reliable?

The price and inventory of UF1003-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UF1003-T is usually 5 days.

3.What payment methods are accepted for UF1003-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UF1003-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UF1003-T?

UF1003-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UF1003-T 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 UF1003-T?

For technical support, including UF1003-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UF1003-T requirements.

6.How does Aetrix verify that UF1003-T is sourced from the original manufacturer or authorized distributors?

All UF1003-T 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 UF1003-T meets industry standards.

7.What is the process for return or replacement of UF1003-T?

All UF1003-T units undergo pre-shipment inspection (PSI). If there is an issue with UF1003-T, 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 UF1003-T part is unused and in its original packaging.

Return procedure for UF1003-T:

1.Submit a request within 90 days.

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

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