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Diodes Incorporated US1DWF-7
- Part No.:
- US1DWF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SOD-123F
- Datasheet:
-
US1DWF-7.pdf
- Description:
- DIODE GEN PURP 200V 1A SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:35,285
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Product details
Overview
US1DWF-7 from Diodes Incorporated is a 1.0A, 200V ultra-fast surface-mount rectifier in SOD123F package, featuring 35ns reverse recovery time, 0.95V max forward voltage at 1A/25°C, and 5µA max reverse leakage at 200V/25°C. It serves as a boost diode in PFC circuits and secondary rectifier/freewheeling diode in high-frequency DC-DC converters for flat-panel displays and LED lighting.
For engineers reviewing the US1DWF-7 datasheet, US1DWF-7 pinout, US1DWF-7 application, or US1DWF-7 equivalent, key selection criteria include ultrafast recovery (tRR ≤ 35ns), low VF under thermal stress (0.9V typ @ 125°C), JEDEC-qualified reliability, and SOD123F footprint compatibility with high-density PCB layouts.
Technical Context
This rectifier employs glass-passivated die construction to ensure stable junction behavior across –55°C to +150°C operating range and supports high-temperature operation in compact consumer power supplies. Its 34°C/W junction-to-case thermal resistance enables efficient heat transfer when mounted on minimal copper pads.
The device delivers 30A non-repetitive surge capability and maintains <100µA IR at 125°C - critical for maintaining efficiency in thermally constrained LED drivers and charger secondary-side rectification where leakage-induced standby loss must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 200 V - Withstands peak reverse voltage in PFC boost stages without breakdown |
| IO | 1.0 A - Continuous DC output current rating at 25°C ambient, derated per Figure 1 |
| tRR | 35 ns - Enables >1 MHz switching in resonant and quasi-resonant converters |
| VF Max | 0.95 V @ 1A, 25°C - Limits conduction loss to ≤0.95W at rated current |
| IR Max | 5 µA @ 200V, 25°C - Minimizes standby power loss in always-on display backlight circuits |
| RθJC | 34 °C/W - Allows direct thermal path to small copper pour for passive cooling |
| Package | SOD123F - 1.8mm × 2.7mm footprint with 0.35–0.85mm lead length for automated placement |
Pinout & Package
Package: SOD123F - Low-profile (max height 1.15mm), halogen-free molded plastic housing with matte tin-plated copper leadframe; cathode indicated by band on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input current entry point during forward conduction | Connected to switch node in boost PFC or transformer secondary in flyback |
| Cathode | Output current exit point during forward conduction | Connected to output capacitor or freewheeling path; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| Ultrafast recovery time | tRR = 35 ns ensures minimal switching loss and EMI in >500 kHz SMPS |
| Low forward voltage | VF = 0.9V typ @ 125°C reduces thermal stress in enclosed LED driver housings |
| Glass passivated junction | Enhances humidity resistance and long-term parameter stability in humid environments |
| JEDEC-qualified reliability | Qualified per AEC-Q standards for high-reliability consumer and industrial applications |
| Green RoHS-compliant packaging | Halogen- and antimony-free compound meets IEC 61249-2-21 and JEDEC J-STD-020 MSL Level 1 |
Applications
| Flat Panel Display Power | USB-C PD Charger Secondary |
|---|---|
Use Scenario: High-efficiency boost converter supplying 24–48V backlight rails in LCD/LED TVs. IC Role / Device Role / Timing Role: Boost diode conducting during MOSFET off-time; handles 1A average current with minimal VF drift over temperature. Use Value: 35ns tRR prevents reverse recovery tail current from overlapping with next switching cycle, reducing EMI and improving efficiency above 300 kHz. | Use Scenario: Secondary-side synchronous rectification replacement in 30–65W USB-C PD adapters. IC Role / Device Role / Timing Role: Freewheeling diode clamping transformer leakage in flyback topology; operates at 100–200 kHz with 150°C junction temp. Use Value: 5µA IR max at 125°C cuts no-load power loss below 30 mW - critical for meeting DOE Level VI and EU CoC Tier 2 standby requirements. |
| Smart LED Driver | Industrial AC-DC Adapter |
Use Scenario: Constant-current LED driver for tunable-white architectural lighting with dimming control. IC Role / Device Role / Timing Role: Output rectifier in buck-derived topology; conducts continuous 1A with 100% duty-cycle capability at elevated ambient. Use Value: RθJA = 87°C/W on 0.2"×0.25" pad allows full 1A load without heatsink in sealed IP65 enclosures. | Use Scenario: 24V/1A auxiliary supply in PLC I/O modules operating at 70°C ambient. IC Role / Device Role / Timing Role: Input rectifier for isolated DC-DC stage; withstands 200VAC line surges and 150°C junction temperature. Use Value: Glass passivation and –55°C to +150°C rating ensure parametric stability across extended industrial temperature cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MBR120LSFT1G | 1A/20V Schottky; VF = 0.45V typ but VRRM only 20V | Not suitable for 200V PFC or universal-input AC-DC | Select only for low-VF, low-VRRM DC-DC outputs |
| US1M-13-F | 1A/1000V; tRR = 75ns, VF = 1.7V max - slower and higher loss | Better for high-voltage flyback snubbers; unsuitable for high-frequency PFC | Choose when VRRM > 600V required and switching frequency < 200 kHz |
Compared with MBR120LSFT1G and US1M-13-F, US1DWF-7 uniquely balances 200V blocking, 35ns speed, and 0.95V VF - making it optimal for space-constrained, high-frequency PFC and secondary rectification where both voltage rating and recovery performance are simultaneously critical.
Availability
US1DWF-7 is available at Aetrix Electronics and suitable for flat panel display power, USB-C PD charger secondary rectification, and smart LED driver designs requiring stable component supply and JEDEC-qualified reliability.
Supply support for US1DWF-7 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 US1DWF belongs to Diodes' ultra-fast rectifier product line, engineered specifically for high-frequency, high-efficiency AC-DC and DC-DC conversion in thermally demanding consumer and industrial power supplies.
FAQ
What is the maximum junction temperature for US1DWF-7?
The US1DWF-7 has an operating junction temperature range of –55°C to +150°C, verified per JEDEC qualification standards. Its thermal resistance values (RθJC = 34°C/W, RθJA = 87°C/W on specified pad) allow full 1A operation at up to 125°C ambient when properly mounted on recommended PCB copper area.
Is US1DWF-7 suitable for automotive applications?
The standard US1DWF-7 is not automotive-qualified; however, Diodes offers the US1DWFQ variant, which is AEC-Q101 qualified and documented in a separate datasheet. For automotive-grade designs requiring PPAP compliance and extended temperature validation, US1DWFQ must be specified instead of US1DWF-7.
How does the SOD123F package compare to SMA in size and thermal performance?
The SOD123F measures 1.80mm × 2.70mm × 1.15mm - approximately 40% smaller footprint than SMA (4.5mm × 2.7mm). While its RθJA is higher than SMA due to reduced copper exposure, its RθJC of 34°C/W enables effective heat conduction through the leads when soldered to thermal vias or internal ground planes.
Can US1DWF-7 replace UF4007 in a 100 kHz flyback converter?
Yes - US1DWF-7 offers superior performance: 35ns tRR vs. UF4007's 75ns, 0.95V VF vs. 1.7V, and SOD123F's smaller footprint. However, verify layout clearance for 200V working voltage and confirm thermal margin using RθJA = 87°C/W, as US1DWF-7's lower thermal mass requires careful pad design for sustained 1A loads.
US1DWF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123F
- 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:
- 950 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 200 V
- Capacitance @ Vr, F:
- 14pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
- Operating Temperature - Junction:
- -55°C ~ 150°C
US1DWF-7 FAQ
1.How can I place an order for US1DWF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for US1DWF-7 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 US1DWF-7 reliable?
The price and inventory of US1DWF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1DWF-7 is usually 5 days.
3.What payment methods are accepted for US1DWF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1DWF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for US1DWF-7?
US1DWF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your US1DWF-7 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 US1DWF-7?
For technical support, including US1DWF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1DWF-7 requirements.
6.How does Aetrix verify that US1DWF-7 is sourced from the original manufacturer or authorized distributors?
All US1DWF-7 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 US1DWF-7 meets industry standards.
7.What is the process for return or replacement of US1DWF-7?
All US1DWF-7 units undergo pre-shipment inspection (PSI). If there is an issue with US1DWF-7, 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 US1DWF-7 part is unused and in its original packaging.
Return procedure for US1DWF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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