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Taiwan Semiconductor Corporation TSF20U45C
- Part No.:
- TSF20U45C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Diode Arrays
- Package:
- TO-220-3 Full Pack, Isolated Tab
- Datasheet:
-
TSF20U45C.pdf
- Description:
- DIODE ARR SCHOT 45V 10A ITO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,469
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Product details
Overview
TSF20U45C from Taiwan Semiconductor is a 20A, 45V Trench Schottky rectifier in ITO-220AB package, featuring low forward voltage (0.53 V @ 10 A, 25°C), high surge capability (180 A IFSM), and 150°C maximum junction temperature. It serves as a primary output rectifier in high-efficiency SMPS for industrial power supplies.
For engineers reviewing the TSF20U45C datasheet, TSF20U45C pinout, TSF20U45C application, or TSF20U45C equivalent, key selection criteria include forward voltage at 20A/125°C (0.55 V), thermal resistance (3°C/W), dual-die configuration, RoHS/halogen-free compliance, and ITO-220AB mechanical mounting requirements.
Technical Context
This device uses patented Trench Schottky technology to achieve stable VF across temperature-0.44 V @ 10 A, 125°C-and maintains low reverse leakage (60 mA @ 125°C, rated VR). Its dv/dt rating of 10,000 V/µs supports fast-switching topologies without parasitic turn-on.
The dual-die construction in a single ITO-220AB case enables symmetrical current sharing and thermal coupling, while the matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 45 V - Maximum repetitive reverse blocking voltage; defines usable input/output voltage margin in DC/DC converters. |
| IF | 20 A - Continuous average forward current; sets minimum heatsink sizing for 100% duty-cycle operation. |
| VF @ 10A, 25°C | 0.53 V - Directly determines conduction loss (5.3 W per diode at 10 A); critical for efficiency at light-to-moderate loads. |
| IFSM | 180 A - Peak non-repetitive surge current; ensures survivability during inrush or short-circuit events in AC-DC adapters. |
| RθJC | 3°C/W - Junction-to-case thermal resistance; enables accurate thermal modeling when mounted to heatsink with known interface resistance. |
| TJ max | 150°C - Maximum allowable junction temperature; allows operation in sealed enclosures up to 105°C ambient with proper derating. |
Pinout & Package
Package: ITO-220AB - Insulated TO-220 variant with internal isolation between collector (case) and emitter terminals; requires no insulating washer when mounted to grounded heatsink. Case polarity marked on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Input terminal for first Schottky die | Connected to high-side switching node; must withstand full VRRM and IFSM stress. |
| Cathode 1 | Output terminal for first Schottky die | Common cathode connection shared with Cathode 2; forms low-impedance return path for dual-die output. |
| Anode 2 | Input terminal for second Schottky die | Enables parallel rectification or dual-output configurations without external paralleling components. |
| Case (Tab) | Isolated thermal and electrical ground reference | Electrically isolated from both dies; provides mechanical mounting surface and primary heat transfer path to heatsink. |
Key Features
| Feature | Design Value |
|---|---|
| Trench Schottky architecture | Reduces VF by ~15% vs planar Schottky at 20A/125°C, directly improving full-load efficiency in 48V-output SMPS. |
| High-temperature VF stability | VF drops to 0.44 V @ 10 A, 125°C-enabling lower conduction loss at elevated ambient temperatures common in enclosed LED drivers. |
| Dual-die integration | Two independent 20A Schottky dies in one ITO-220AB package-reduces PCB area vs discrete dual-diode solutions and improves thermal tracking. |
| RoHS + halogen-free | Complies with IEC 61249-2-21; eliminates brominated flame retardants and supports lead-free reflow assembly without compromising UL 94V-0 molding compound performance. |
Applications
| Server PSU Output Rectification | Industrial DC/DC Converter |
|---|---|
Use Scenario: Primary 12V/20A output rectification in 80 PLUS Titanium server PSUs operating continuously at 60–85°C ambient. IC Role / Device Role / Timing Role: Power rectifier converting transformer secondary AC to regulated DC; conducts during positive half-cycle only. Use Value: 0.55 V VF @ 20A/125°C minimizes conduction loss (11 W total), reducing heatsink volume by 35% vs legacy 0.72 V devices. | Use Scenario: 24V-to-5V isolated DC/DC converter in programmable logic controller (PLC) backplane power modules. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier replacement; handles 20A continuous output with fast recovery. Use Value: 180 A IFSM withstands 5× overload transients during motor startup, eliminating need for external crowbar protection. |
| LED Driver Secondary Side | Laptop Adapter Output Stage |
Use Scenario: Constant-current output rectification in 48V-input, 36V/1.5A LED drivers deployed in outdoor streetlight housings. IC Role / Device Role / Timing Role: High-side freewheeling diode in buck-derived constant-current topology. Use Value: 150°C TJ max and 3°C/W RθJC allow operation at 95°C case temperature without derating-enabling compact sealed housing design. | Use Scenario: 20A output rectification in 65W GaN-based laptop adapters with 100 kHz–2 MHz switching frequency. IC Role / Device Role / Timing Role: Low-loss output rectifier replacing conventional Si diodes in quasi-resonant flyback secondary. Use Value: 10,000 V/µs dv/dt rating prevents false turn-on during fast voltage transitions, eliminating snubber losses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-20CPH045 | Same ITO-220AB package, 45V VRRM, but 0.62 V VF @ 20A/25°C (vs 0.60 V for TSF20U45C); RθJC = 3.5°C/W. | Higher conduction loss reduces efficiency in thermally constrained 65W adapters by ~0.8%. | Select TSF20U45C where VF-limited efficiency or 125°C operation is prioritized. |
| ON Semiconductor MBR2045CT | TO-220AB (non-isolated case), 45V, 20A; VF = 0.65 V @ 20A/25°C; requires insulating washer for grounded heatsinks. | Non-isolated case increases BOM cost and assembly steps; higher VF degrades light-load efficiency in lighting drivers. | Choose TSF20U45C when electrical isolation, lower VF, or simplified thermal mounting is required. |
Compared with VS-20CPH045 and MBR2045CT, TSF20U45C delivers the lowest VF at high temperature and integrated electrical isolation-making it optimal for space-constrained, high-efficiency, and thermally demanding industrial and adapter designs.
Availability
TSF20U45C is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and LED lighting applications requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for TSF20U45C 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and power semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability discrete devices for industrial and computing markets.
The TSF20UxxC series targets high-efficiency power conversion systems needing low-VF Schottky rectifiers with robust thermal performance and halogen-free compliance-designed specifically for next-generation SMPS and DC/DC modules.
FAQ
What is the maximum junction temperature rating for TSF20U45C?
The TSF20U45C has a maximum junction temperature (TJ max) of 150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet. This rating enables reliable operation in sealed enclosures and high-ambient environments when used within its thermal derating curve. The TSF20U45C's 3°C/W junction-to-case resistance supports effective heat transfer to properly sized heatsinks.
Does TSF20U45C have electrically isolated terminals?
Yes, TSF20U45C uses the ITO-220AB package, which features an electrically isolated metal tab (case). The tab is not internally connected to either anode or cathode, allowing direct mounting to a grounded heatsink without insulation hardware. This isolation is confirmed in the mechanical data section and marking diagram of the TSF20U45C datasheet.
What is the forward voltage of TSF20U45C at 20A and 125°C?
The TSF20U45C exhibits a typical forward voltage of 0.55 V at 20A and 125°C, as specified in the Electrical Specifications table under "Forward voltage per diode." This value reflects real-world conduction loss under high-temperature, high-current conditions and is critical for thermal design validation in industrial power supplies using TSF20U45C.
Is TSF20U45C RoHS and halogen-free compliant?
Yes, TSF20U45C is fully RoHS-compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the official datasheet. The molding compound meets UL 94V-0 flammability rating, and the matte tin-plated leads satisfy J-STD-002 solderability requirements-ensuring compatibility with modern lead-free manufacturing processes for TSF20U45C.
What is the surge current rating for TSF20U45C?
The TSF20U45C has a non-repetitive peak forward surge current (IFSM) rating of 180 A for an 8.3 ms half-sine wave, as defined in the Absolute Maximum Ratings table. This rating applies under rated load conditions and ensures robustness against line surges and inrush currents in AC-DC adapters and industrial SMPS where TSF20U45C is deployed.
TSF20U45C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-220-3 Full Pack, Isolated Tab
- Packaging:
- Tube
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io) (per Diode):
- 10A
- Voltage - Forward (Vf) (Max) @ If:
- 530 mV @ 10 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 300 µA @ 45 V
- Operating Temperature - Junction:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ITO-220AB
TSF20U45C FAQ
1.How can I place an order for TSF20U45C through Aetrix?
Please submit a Request for Quotation (RFQ) for TSF20U45C 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 TSF20U45C reliable?
The price and inventory of TSF20U45C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSF20U45C is usually 5 days.
3.What payment methods are accepted for TSF20U45C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSF20U45C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSF20U45C?
TSF20U45C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSF20U45C 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 TSF20U45C?
For technical support, including TSF20U45C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSF20U45C requirements.
6.How does Aetrix verify that TSF20U45C is sourced from the original manufacturer or authorized distributors?
All TSF20U45C 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 TSF20U45C meets industry standards.
7.What is the process for return or replacement of TSF20U45C?
All TSF20U45C units undergo pre-shipment inspection (PSI). If there is an issue with TSF20U45C, 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 TSF20U45C part is unused and in its original packaging.
Return procedure for TSF20U45C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TSF20U45C Tags
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