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Diodes Incorporated UF1002-T
- Part No.:
- UF1002-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
UF1002-T.pdf
- Description:
- DIODE GEN PURP 100V 1A DO41
- Quantity:
- Payment:
- Shipping:
Inventory:11,338
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Product details
Overview
UF1002-T from Diodes Incorporated is a 100V peak repetitive reverse voltage ultra-fast rectifier diode in DO-41 package, rated for 1.0A average forward current at 55°C ambient, with 1.3V forward voltage at 1.0A and 50ns reverse recovery time-used in high-frequency switch-mode power supplies, AC/DC adapters, and DC-DC converter output stages.
For engineers reviewing the UF1002-T datasheet, UF1002-T pinout, UF1002-T application, or UF1002-T equivalent, key selection criteria include VRRM (100V), trr (50ns), VFM (1.3V @ 1A), IFSM (30A), and thermal resistance (95K/W) for efficiency-critical rectification in compact power designs.
Technical Context
This ultra-fast rectifier uses a diffused junction process to achieve low forward voltage drop and fast switching performance. Its 50ns reverse recovery time enables operation in 100–500kHz SMPS topologies without excessive switching loss or EMI generation.
The device supports single-phase half-wave rectification under resistive or inductive loads at 60Hz, with derating required for capacitive loads. Thermal design must account for RJA = 95K/W and 150°C max junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 100V - Maximum repetitive reverse voltage before breakdown; defines safe operating range in 12–48V input AC/DC front-ends. |
| IO (TA=55°C) | 1.0A - Continuous average forward current rating at 55°C ambient; requires heatsinking or airflow above 45°C ambient. |
| VFM @ 1.0A | 1.3V - Forward voltage drop at rated current; determines conduction loss (1.3W dissipation at 1A). |
| trr | 50ns - Reverse recovery time measured at IF=0.5A, IR=1.0A, Irr=0.25A; enables efficient operation up to ~300kHz. |
| IFSM (8.3ms) | 30A - Non-repetitive surge current capability; withstands inrush during cold-start of offline converters. |
| RJA | 95K/W - Junction-to-ambient thermal resistance; implies ~95°C rise per watt without PCB copper or airflow. |
| IRM @ 25°C | 5.0µA - Peak reverse leakage at rated blocking voltage; negligible leakage impact in low-power auxiliary rails. |
Pinout & Package
DO-41 axial-leaded plastic package with cathode band marking; leads are tin-plated, solderable per MIL-STD-202 Method 208. Mounting position unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry point | Connected to AC source or transformer secondary; polarity-sensitive in bridge or half-wave configuration. |
| Cathode (banded end) | Forward current exit / reverse blocking terminal | Connected to output filter capacitor or load; band identifies polarity for correct PCB layout and assembly. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast recovery | 50ns trr enables high-frequency rectification with minimal switching loss and reduced EMI generation. |
| Low forward voltage | 1.3V @ 1.0A reduces conduction loss by ~15% vs. standard FR10x series, improving efficiency in 5–24V outputs. |
| High surge rating | 30A IFSM withstands repeated cold-start surges in offline SMPS without degradation. |
| UL 94V-0 plastic case | Flame-retardant encapsulation meets safety requirements for Class II power supplies and industrial equipment. |
| Wide temperature range | -65°C to +150°C operation supports deployment in automotive under-hood or industrial control environments. |
Applications
| AC/DC Adapter Output Stage | DC-DC Converter Secondary Rectifier |
|---|---|
Use Scenario: 12V/1A output stage in wall-mounted AC/DC adapter with 60kHz flyback topology. IC Role / Device Role / Timing Role: Ultra-fast rectifier converting high-frequency transformer output to regulated DC; replaces slower 1N400x diodes. Use Value: 50ns trr minimizes reverse recovery loss, enabling >85% efficiency at full load while reducing heatsink size. | Use Scenario: Secondary-side rectification in isolated 5V/2A buck-derived DC-DC module for telecom baseband boards. IC Role / Device Role / Timing Role: High-speed unidirectional current path synchronized to transformer reset; critical for maintaining regulation under transient load steps. Use Value: 1.3V VFM lowers conduction loss by 0.2W vs. UF1004, directly improving thermal margin on dense PCBs. |
| Industrial PLC Power Supply Input | LED Driver Flyback Output |
Use Scenario: Input rectification stage in 24V/1A DIN-rail power supply for programmable logic controllers. IC Role / Device Role / Timing Role: Half-wave rectifier feeding bulk capacitor; operates continuously at 55°C ambient with natural convection cooling. Use Value: 95K/W RJA allows direct mounting on PCB with 1-in² copper pour, eliminating discrete heatsink. | Use Scenario: Output rectifier in constant-current LED driver with 36V string voltage and 350mA output. IC Role / Device Role / Timing Role: Fast-switching diode in discontinuous conduction mode (DCM) flyback, handling 100kHz switching transitions. Use Value: Low 5.0µA IRM prevents capacitor discharge during off-time, ensuring stable current regulation across line variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R06 | VRRM = 600V, trr = 75ns, VFM = 1.7V @ 1A, DO-41 | Higher voltage rating but slower recovery and higher VF; suited for 400V+ PFC stages, not optimal for 100V SMPS outputs. | Select when system requires >400V blocking but can accept 0.4V higher conduction loss and 25ns longer recovery. |
| ON Semi MUR105 | VRRM = 50V, trr = 35ns, VFM = 1.15V @ 1A, DO-41 | Lower voltage rating and faster recovery; ideal for 5–12V outputs where 100V margin is excessive. | Choose for low-voltage, high-efficiency designs where 50V VRRM suffices and sub-40ns trr improves light-load efficiency. |
Compared with STTH1R06 and MUR105, UF1002-T uniquely balances 100V blocking, 50ns speed, and 1.3V VF for cost-sensitive 12–24V SMPS outputs-offering optimal trade-off between surge robustness, thermal performance, and conduction loss in mid-range power adapters.
Availability
UF1002-T is available at Aetrix Electronics and suitable for AC/DC adapters, industrial PLC power supplies, and LED driver flyback outputs requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for UF1002-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 US.
The UF100x series belongs to Diodes' ultra-fast rectifier product line, engineered specifically for high-frequency, high-efficiency AC/DC and DC/DC power conversion in space-constrained consumer and industrial applications.
FAQ
What is the maximum allowable junction temperature for UF1002-T?
The absolute maximum junction temperature is +150°C, as specified in the DS25002 datasheet. Operation at this limit requires strict thermal management-typically achieved via PCB copper area, airflow, or derating IO below 1.0A. At 100°C junction, the device remains within safe operating area for continuous 1.0A conduction if ambient is held ≤55°C with adequate heatsinking.
Can UF1002-T replace UF1001 in a 50V-rated circuit?
Yes-UF1002-T has VRRM = 100V versus UF1001's 50V, offering double the reverse voltage margin. Both share identical package, thermal characteristics, and forward performance (VFM = 1.0V for UF1001, 1.3V for UF1002). Substitution is electrically safe and improves reliability in circuits exposed to voltage transients or aging-related leakage increase.
Is UF1002-T suitable for synchronous rectification designs?
No-UF1002-T is a passive silicon PN-junction diode, not a MOSFET-based synchronous rectifier. It lacks gate control, cannot be actively turned off, and exhibits fixed forward voltage and reverse recovery behavior. Synchronous rectification requires externally driven N-channel MOSFETs with precise timing control, such as those used in advanced LLC or ZVS converters.
How does UF1002-T's reverse recovery time affect EMI in a 100kHz flyback converter?
With trr = 50ns, UF1002-T generates minimal reverse recovery current spikes during turn-off, reducing high-frequency ringing on the drain node and lowering conducted EMI in the 30–100MHz band. This allows simpler EMI filter design compared to standard recovery diodes (e.g., 1N4007, trr > 2µs), especially when paired with snubberless transformer layouts.
UF1002-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):
- 100 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 @ 100 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
UF1002-T FAQ
1.How can I place an order for UF1002-T through Aetrix?
Please submit a Request for Quotation (RFQ) for UF1002-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 UF1002-T reliable?
The price and inventory of UF1002-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UF1002-T is usually 5 days.
3.What payment methods are accepted for UF1002-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UF1002-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UF1002-T?
UF1002-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UF1002-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 UF1002-T?
For technical support, including UF1002-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UF1002-T requirements.
6.How does Aetrix verify that UF1002-T is sourced from the original manufacturer or authorized distributors?
All UF1002-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 UF1002-T meets industry standards.
7.What is the process for return or replacement of UF1002-T?
All UF1002-T units undergo pre-shipment inspection (PSI). If there is an issue with UF1002-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 UF1002-T part is unused and in its original packaging.
Return procedure for UF1002-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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