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Diodes Incorporated UF1004-A52
- Part No.:
- UF1004-A52
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
UF1004-A52.pdf
- Description:
- DIODE GEN PURP 400V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:3,634
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Product details
Overview
UF1004-A52 from Diodes Incorporated is a 1.0A ultra-fast rectifier diode in DO-41 package, rated for 400V peak repetitive reverse voltage (VRRM), 1.3V forward voltage at 1.0A (VFM), and 50ns reverse recovery time (trr), designed for high-frequency switching power supplies and DC-DC converters.
For engineers reviewing the UF1004-A52 datasheet, UF1004-A52 pinout, UF1004-A52 application, or UF1004-A52 equivalent, key selection criteria include VRRM rating, trr performance, thermal resistance (RθJA = 95°C/W), and DO-41 mechanical compatibility in compact AC/DC front-end and flyback secondary rectification layouts.
Technical Context
This ultra-fast rectifier uses a diffused junction structure to achieve low reverse leakage (5.0 µA @ 25°C) and fast recovery (50 ns), enabling efficient operation in high-frequency SMPS topologies where switching losses must be minimized. Its surge capability (30A IFSM, 8.3ms half-sine) supports transient line events without failure.
The device operates across –65°C to +150°C and features RoHS-compliant tin-plated leads with UL 94V-0 molded plastic case. Polarity is marked by a cathode band; no internal capacitance compensation or integrated protection circuitry is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in AC line rectification and flyback snubber circuits. |
| VFM @ IF = 1.0A | 1.3 V - Forward conduction loss at rated current; directly impacts conduction loss and thermal rise in continuous-duty rectifiers. |
| trr | 50 ns - Reverse recovery time; enables stable operation up to ~2 MHz switching frequencies before significant switching loss dominates. |
| IFSM (8.3ms) | 30 A - Non-repetitive surge current rating; ensures survivability during cold-start inrush or output short-circuit transients. |
| RθJA | 95 °C/W - Junction-to-ambient thermal resistance; requires ≥9.5 mm lead length at ambient for full 1.0A IO rating at TA = 55°C. |
| IRM @ 25°C | 5.0 µA - Reverse leakage at rated VRRM; critical for low-power standby modes and high-impedance hold-up circuits. |
Pinout & Package
Package: DO-41 molded plastic case, UL 94V-0 rated, cathode band polarity marking, tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of AC source or transformer secondary; determines forward bias direction in bridge or half-wave configuration. |
| Cathode | Forward current exit / reverse blocking terminal | Marked with band; connects to positive rail in rectifier output; withstands full VRRM when reverse-biased. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast recovery | 50 ns trr enables >1 MHz switching in PFC and resonant converters without excessive diode switching loss. |
| Low forward voltage | 1.3 V @ 1.0A reduces conduction loss by ~15% vs. standard 1N400x series, improving efficiency in 5–24V output supplies. |
| High surge rating | 30A IFSM supports robustness against 100-cycle AC line surges and hot-plug transients in industrial power modules. |
| ESD robustness | ±15 kV contact discharge (IEC 61000-4-2) ensures handling reliability during automated assembly and board-level testing. |
Applications
| AC-DC Adapter Secondary Rectification | Flyback Converter Output Stage |
|---|---|
Use Scenario: 12V/1A isolated output in wall-wart adapters with 65–100 kHz switching frequency. IC Role / Device Role / Timing Role: Unidirectional current steering diode converting transformer secondary AC to regulated DC; timing role defined by trr-limited turn-off delay. Use Value: 50 ns trr minimizes reverse recovery charge (Qrr), reducing switching node ringing and EMI generation at 100 kHz. | Use Scenario: Output rectification in 5V/2A offline flyback for smart home hubs. IC Role / Device Role / Timing Role: Synchronous-free secondary-side rectifier; its 1.3V VFM sets minimum conduction loss floor independent of MOSFET gate drive. Use Value: Low IRM (5 µA) prevents output voltage droop during light-load burst-mode operation. |
| DC-DC Boost Pre-Regulator | Industrial Sensor Power Supply |
Use Scenario: 24V input boost stage feeding 48V bus in PLC I/O module. IC Role / Device Role / Timing Role: High-side rectifier in continuous-conduction-mode (CCM) boost; trr governs diode reverse recovery overlap with switch turn-on. Use Value: 95°C/W RθJA allows direct PCB mounting without heatsink under 70°C ambient at full load. | Use Scenario: 3.3V local supply derived from 24V field bus in explosion-proof temperature transmitter. IC Role / Device Role / Timing Role: Input-stage rectifier protecting downstream LDO from reverse polarity and AC transients. Use Value: –65°C to +150°C operating range ensures functionality in unheated outdoor enclosures and high-temperature process environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| US1J (Diodes Inc.) | VRRM = 600 V, trr = 75 ns, VFM = 1.7 V @ 1.0A | Higher voltage margin but slower recovery and higher conduction loss | Prefer US1J only if system requires >400 V blocking with acceptable 25 ns trr penalty. |
| STTH1L06 (STMicroelectronics) | VRRM = 600 V, trr = 50 ns, VFM = 1.4 V @ 1.0A, DO-41 compatible | Same trr, slightly higher VFM, identical package and footprint | Select STTH1L06 when needing 600 V rating without sacrificing speed or layout change. |
Compared with UF1004-A52, US1J trades speed for voltage headroom while STTH1L06 extends voltage rating to 600 V with matched trr and near-identical thermal behavior-making it a drop-in upgrade where higher blocking is required.
Availability
UF1004-A52 is available at Aetrix Electronics and suitable for AC-DC adapters, flyback converters, industrial sensor power supplies, and DC-DC boost pre-regulators requiring stable component supply with consistent DO-41 form factor and ultra-fast recovery performance.
Supply support for UF1004-A52 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, manufacturing, and sales operations across Asia, Europe, and North America.
The UF100x series belongs to Diodes' ultra-fast rectifier product line, engineered specifically for high-efficiency, high-frequency power conversion in consumer, industrial, and computing power supplies.
FAQ
What is the maximum junction temperature for UF1004-A52?
The absolute maximum junction temperature (Tj) is +150°C, and the storage temperature range matches this at –65°C to +150°C. Derating begins above 55°C ambient for full 1.0A average current, based on RθJA = 95°C/W and 9.5mm lead length requirement.
Is UF1004-A52 suitable for synchronous rectification designs?
No - UF1004-A52 is a passive silicon PN-junction rectifier and lacks gate control or body-diode optimization for synchronous operation. It serves only as a freewheeling or output rectifier in non-synchronous topologies like standard flyback or boost converters.
Does UF1004-A52 have a specified reverse recovery charge (Qrr)?
Qrr is not explicitly listed in the DS25002 datasheet, but trr = 50 ns is measured under standardized conditions (IF = 0.5A, IR = 1.0A, Irr = 0.25A). Qrr can be estimated indirectly using trr and di/dt, though design margins should rely on measured trr and VFM for loss calculation.
Can UF1004-A52 replace UF1003-A52 in an existing design?
Yes - UF1004-A52 is a direct upgrade from UF1003-A52 (200V VRRM) with doubled blocking voltage (400V) and identical package, pinout, and thermal characteristics. No layout or thermal redesign is needed, provided the higher VRRM aligns with system overvoltage requirements.
UF1004-A52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 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:
- 20pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
- Operating Temperature - Junction:
- -65°C ~ 150°C
UF1004-A52 FAQ
1.How can I place an order for UF1004-A52 through Aetrix?
Please submit a Request for Quotation (RFQ) for UF1004-A52 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 UF1004-A52 reliable?
The price and inventory of UF1004-A52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UF1004-A52 is usually 5 days.
3.What payment methods are accepted for UF1004-A52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UF1004-A52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UF1004-A52?
UF1004-A52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UF1004-A52 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 UF1004-A52?
For technical support, including UF1004-A52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UF1004-A52 requirements.
6.How does Aetrix verify that UF1004-A52 is sourced from the original manufacturer or authorized distributors?
All UF1004-A52 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 UF1004-A52 meets industry standards.
7.What is the process for return or replacement of UF1004-A52?
All UF1004-A52 units undergo pre-shipment inspection (PSI). If there is an issue with UF1004-A52, 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 UF1004-A52 part is unused and in its original packaging.
Return procedure for UF1004-A52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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