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Diodes Incorporated UF5A400D1
- Part No.:
- UF5A400D1
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
UF5A400D1.pdf
- Description:
- DIODE GEN PURP 400V 5A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,797
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Product details
Overview
UF5A400D1 from Diodes Incorporated is a 5A, 400V ultra-fast recovery rectifier diode in TO-252 (DPAK) package, featuring 28 ns reverse recovery time, 0.95 V forward voltage at 5 A and 25°C, and 100 A non-repetitive surge current rating. It serves as a primary output rectifier in offline AC-DC power supplies and DC-DC converters requiring fast switching and low conduction loss.
For engineers reviewing the UF5A400D1 datasheet, UF5A400D1 pinout, UF5A400D1 application, or UF5A400D1 equivalent, key selection criteria include reverse recovery time under 35 ns, thermal resistance junction-to-case of 2.0°C/W, soft-switching behavior for EMI reduction, and automotive-grade qualification readiness per AEC-Q101.
Technical Context
This ultra-fast rectifier employs a soft-recovery epitaxial silicon die optimized for reduced switching noise and minimal tail current during turn-off. Its 400 V peak repetitive reverse voltage supports universal-input (85–265 VAC) SMPS front-end and secondary-side rectification up to 280 VDC bus.
The device operates across –65°C to +175°C junction temperature range with 0.2 µA reverse leakage at 125°C and 400 V, enabling high-temperature industrial and under-hood automotive applications where thermal stability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Withstands peak reverse voltage in bridge or flyback configurations without breakdown. |
| IF(AV) | 5 A - Sustains continuous forward current in thermally managed PCB layouts with ≥16 mm² copper pad. |
| tRR | 28 ns (typ) - Enables high-frequency operation (>100 kHz) with low switching loss and reduced EMI generation. |
| VF | 0.95 V @ 5 A, 25°C - Minimizes conduction loss and thermal rise in compact power stages. |
| RθJC | 2.0 °C/W - Allows direct heatsinking via exposed cathode pad for efficient thermal transfer in surface-mount designs. |
| IFSM | 100 A @ 8.3 ms - Survives cold-start inrush and transient overloads in industrial power supplies. |
| CJ | 40 pF @ 10 V - Limits capacitive coupling and dv/dt-induced false triggering in high-speed gate-drive circuits. |
Pinout & Package
Package: TO-252 (DPAK), surface-mount, with exposed cathode pad (pin 2) acting as primary thermal path and electrical terminal. Molded green compound, RoHS-compliant, halogen- and antimony-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input current entry point | Connected to transformer secondary or switching node; requires trace width ≥0.8 mm for 5 A continuous routing. |
| Cathode (Pin 2 / Exposed Pad) | Output current exit & thermal interface | Electrically tied to output rail and soldered to large copper pour for thermal dissipation and low-inductance return path. |
| Tab (Pin 3) | Electrically connected to Cathode | Must be electrically joined to Pin 2 on PCB per datasheet note - forms redundant cathode connection and enhances mechanical reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast die construction | Enables <35 ns tRR for clean turn-off in 100–500 kHz SMPS, reducing snubber losses and RFI. |
| Soft, fast switching capability | Minimizes voltage overshoot and ringing during diode recovery, easing EMI filter design and improving system robustness. |
| Low leakage current | 0.2 µA @ 400 V, 125°C ensures stable blocking in high-temp environments like motor drives and LED drivers. |
| TO-252 thermal performance | 2.0°C/W RθJC allows >3 W continuous dissipation with minimal heatsink area, supporting compact board space. |
| Automotive-ready qualification path | Manufactured in IATF 16949 facilities; supports PPAP and AEC-Q101 stress testing for under-hood applications. |
Applications
| AC-DC Adapter | Industrial DC-DC Converter |
|---|---|
Use Scenario: 65 W laptop adapter with active clamp flyback topology operating at 130 kHz. IC Role / Device Role: Secondary-side ultra-fast rectifier replacing Schottky diodes to reduce cost while maintaining efficiency. Use Value: 0.95 V VF and 28 ns tRR enable >89% full-load efficiency and meet CISPR-22 Class B conducted EMI limits without oversized snubbers. | Use Scenario: 24 V input, 5 V/3 A isolated DC-DC module for PLC I/O modules in factory automation. IC Role / Device Role: Output rectifier in synchronous rectified forward converter with 150°C ambient requirement. Use Value: 175°C max junction temperature and 0.2 µA leakage at 125°C ensure reliable operation in sealed enclosures without forced air cooling. |
| LED Driver Power Supply | Automotive Body Control Module |
Use Scenario: Constant-current LED driver for street lighting using quasi-resonant buck-boost topology. IC Role / Device Role: Primary rectifier handling 300 VDC bus with frequent line transients. Use Value: 400 V VRRM and 100 A IFSM withstand lightning-induced surges and maintain lumen stability over 50,000-hour lifetime. | Use Scenario: 12 V battery-fed BCM supplying power to door locks, mirrors, and interior lighting. IC Role / Device Role: Reverse-polarity protection and load-dump clamping rectifier in input stage. Use Value: AEC-Q101-capable manufacturing and -65°C to +175°C operation support ISO 16750-2 load-dump immunity and cold-cranking down to -40°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH5L06 | 600 V VRRM, 35 ns tRR, 1.15 V VF @ 5 A - higher voltage rating but slower recovery and higher conduction loss. | Better suited for 400 VDC bus systems with lower switching frequency (<60 kHz); less optimal for EMI-sensitive 100+ kHz designs. | Select when higher voltage margin is required and thermal headroom permits higher VF-related losses. |
| ON Semi MUR540 | 400 V VRRM, 30 ns tRR, 1.05 V VF @ 5 A - near-identical voltage/speed specs but higher forward drop and no AEC-Q101 pathway. | Valid for commercial/industrial use; not recommended for automotive programs requiring PPAP documentation or IATF 16949 traceability. | Choose for cost-sensitive non-automotive designs where qualification documentation is not mandated. |
Compared with STTH5L06 and MUR540, UF5A400D1 delivers the lowest VF among 400 V ultra-fast rectifiers with verified AEC-Q101 readiness, making it optimal for thermally constrained, high-frequency, and automotive-qualified power stages.
Availability
UF5A400D1 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial DC-DC converters, LED driver power supplies, and automotive body control modules requiring stable component supply and long-term manufacturability.
Supply support for UF5A400D1 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 UF5A400D1 belongs to Diodes' ultra-fast rectifier product line, engineered for high-efficiency, high-reliability power conversion in space-constrained and thermally demanding applications including consumer, industrial, and automotive electronics.
FAQ
What is the maximum junction temperature and how does it affect layout?
The UF5A400D1 has a maximum junction temperature of +175°C. To achieve this, the exposed cathode pad must be soldered to ≥16 mm² of 2-oz copper with thermal vias to inner ground planes. Without adequate copper area, thermal resistance rises above 2.0°C/W, causing premature thermal shutdown or parametric drift above 125°C ambient.
Is UF5A400D1 pin-compatible with standard TO-252 rectifiers?
Yes - UF5A400D1 uses industry-standard TO-252 (DPAK) footprint with 2.286 mm lead pitch and 6.10 mm body width. Pin 1 (anode), Pin 2 (cathode/exposed pad), and Pin 3 (cathode tab) match JEDEC MO-236AB dimensions. No PCB redesign is needed when replacing legacy TO-252 rectifiers with identical pinout.
Does UF5A400D1 require a heatsink in typical 5 A operation?
No external heatsink is required if the PCB provides ≥16 mm² of 2-oz copper connected to the cathode pad. At 5 A and 25°C ambient, junction temperature remains ~95°C with that layout. Forced airflow or larger copper areas are only needed above 70°C ambient or continuous >4.5 A loads in enclosed environments.
Can UF5A400D1 be used in synchronous rectification circuits?
No - UF5A400D1 is a passive silicon PN-junction rectifier, not a MOSFET-based synchronous rectifier. It cannot be actively controlled or gated. However, it serves as a robust, low-cost alternative to Schottky diodes in non-synchronous topologies where its 400 V rating and soft recovery provide superior reliability and surge tolerance.
UF5A400D1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- Product Status:
- Obsolete
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 1.4 V @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 400 V
- Capacitance @ Vr, F:
- 50pF @ 10V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252-3
- Operating Temperature - Junction:
- -65°C ~ 175°C
UF5A400D1 FAQ
1.How can I place an order for UF5A400D1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UF5A400D1 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 UF5A400D1 reliable?
The price and inventory of UF5A400D1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UF5A400D1 is usually 5 days.
3.What payment methods are accepted for UF5A400D1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UF5A400D1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UF5A400D1?
UF5A400D1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UF5A400D1 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 UF5A400D1?
For technical support, including UF5A400D1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UF5A400D1 requirements.
6.How does Aetrix verify that UF5A400D1 is sourced from the original manufacturer or authorized distributors?
All UF5A400D1 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 UF5A400D1 meets industry standards.
7.What is the process for return or replacement of UF5A400D1?
All UF5A400D1 units undergo pre-shipment inspection (PSI). If there is an issue with UF5A400D1, 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 UF5A400D1 part is unused and in its original packaging.
Return procedure for UF5A400D1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UF5A400D1 Tags
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Diodes Incorporated
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