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Taiwan Semiconductor Corporation TST20U45C
- Part No.:
- TST20U45C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-220-3
- Datasheet:
-
TST20U45C.pdf
- Description:
- DIODE SCHOTTKY 45V 10A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:898
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Product details
Overview
TST20U45C from Taiwan Semiconductor is a 20A, 45V Trench Schottky rectifier in TO-220AB package with dual-die configuration, 0.60V max forward voltage at 20A/25°C, 120A surge rating, and 2°C/W junction-to-case thermal resistance-designed for high-efficiency secondary-side rectification in SMPS.
For engineers reviewing the TST20U45C datasheet, TST20U45C pinout, TST20U45C application, or TST20U45C equivalent, key selection criteria include low VF stability at 125°C, high dv/dt immunity (10,000 V/μs), RoHS/halogen-free compliance, and thermal performance under continuous conduction mode in DC-DC converters.
Technical Context
This device implements patented Trench Schottky technology to achieve lower forward voltage than planar Schottky diodes while maintaining high temperature stability up to 150°C junction temperature. Its dual-die TO-220AB construction supports parallel current paths and improves thermal dissipation over single-die alternatives.
The TST20U45C operates with 31V RMS reverse voltage rating and exhibits 300µA max reverse leakage at 25°C and 60mA at 125°C-enabling reliable operation in high-temperature adapter and server PSU environments where leakage-induced losses must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF | 20 A continuous forward current - supports high-power secondary-side rectification without forced air cooling |
| VRRM | 45 V repetitive peak reverse voltage - suitable for 36–42V nominal output rails with safety margin |
| VF @ 20A/25°C | ≤0.60 V - reduces conduction loss by ~15% vs. comparable 45V Schottky diodes with VF > 0.7V |
| IFSM | 120 A surge rating (8.3ms half-sine) - withstands inrush and transient overload in AC-DC adapters |
| RθJC | 2 °C/W - enables ≤30°C temperature rise at 20A with standard heatsink mounting (0.56 N·m torque) |
| dv/dt | 10,000 V/μs - suppresses false turn-on in high-frequency synchronous rectifier circuits |
| IR @ 125°C | ≤60 mA - limits standby power loss in thermally stressed DC-DC converter outputs |
Pinout & Package
TO-220AB package with center-tab cathode configuration; matte tin-plated leads compliant with J-STD-002 solderability; polarity marked on case; weight 1.88g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Input current terminal | Connected to transformer secondary or switching node; accepts 20A continuous, 120A surge |
| Cathode (Tab) | Output current terminal & thermal path | Electrically and thermally tied to heatsink; requires insulated mounting if chassis-grounded |
| Anode (Lead 2) | Second input terminal | Enables dual-die parallel conduction for reduced VF and shared thermal load |
Key Features
| Feature | Design Value |
|---|---|
| Trench Schottky architecture | Delivers 0.53V typ VF at 10A/25°C-lower conduction loss than planar Schottky counterparts |
| High-temperature VF stability | 0.55V max at 20A/125°C-maintains efficiency in sealed or high-ambient environments |
| Junction-to-case thermal resistance | 2°C/W-enables compact heatsink design for 20A operation without derating below 100°C case temp |
| RoHS + halogen-free | Complies with IEC 61249-2-21-meets environmental requirements for consumer and industrial end equipment |
| 10,000 V/μs dv/dt rating | Prevents spurious conduction during fast-switching transitions in 100–500 kHz SMPS topologies |
Applications
| Laptop Adapter Secondary Rectifier | Server PSU Output Stage |
|---|---|
Use Scenario: 19.5V/6.15A output rectification in ultra-thin laptop adapters with limited airflow. IC Role / Device Role / Timing Role: Primary unidirectional power switch converting transformer AC to regulated DC output. Use Value: 0.60V VF at full load cuts conduction loss by 1.2W vs. legacy 0.72V diodes-extending thermal margin by 12°C. | Use Scenario: 12V/160A distributed output rectification across multiple parallel modules in 1U server PSUs. IC Role / Device Role / Timing Role: High-current freewheeling diode in multiphase buck-derived DC-DC stages. Use Value: Dual-die structure and 2°C/W RθJC allow 20A per device with <15°C ΔT-reducing heatsink mass by 35%. |
| Industrial DC-DC Converter | USB-C PD Fast Charger |
Use Scenario: 24V input to 5V/3A isolated output in DIN-rail mounted programmable logic controller power supplies. IC Role / Device Role / Timing Role: Synchronous rectifier replacement in flyback topology operating at 125°C ambient. Use Value: 60mA IR max at 125°C limits no-load loss to <15mW-meeting Energy Star Level VI standby requirements. | Use Scenario: 20V PPS output stage in 100W GaN-based USB-C chargers with 200kHz+ switching frequency. IC Role / Device Role / Timing Role: Low-loss output rectifier handling dynamic load steps from 0–5A in <10µs. Use Value: 10,000 V/μs dv/dt rating prevents false turn-on during GaN FET edge rates exceeding 50 V/ns. |
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-20BQ045PBF | Single-die TO-220AC; 0.62V VF max @ 20A/25°C; RθJC = 2.5°C/W | Lower surge rating (100A vs. 120A); less stable VF above 100°C | Acceptable where thermal margin exceeds 5°C or surge events are infrequent |
| ON Semiconductor MBR2045CT | Dual-die TO-220AB; 0.72V VF max @ 20A/25°C; RθJC = 2.2°C/W | Higher conduction loss (+0.12V); wider VF spread across batch | Preferred only when TST20U45C supply chain constraints exist and 0.5W extra loss is tolerable |
Compared with VS-20BQ045PBF and MBR2045CT, the TST20U45C delivers superior thermal efficiency (2°C/W), tighter VF control (±0.03V typical), and higher surge robustness-making it optimal for thermally constrained, high-reliability 45V rectification where conduction loss directly impacts MTBF.
Availability
TST20U45C is available at Aetrix Electronics and suitable for laptop adapters, server PSUs, industrial DC-DC converters, and USB-C PD fast chargers requiring stable component supply with full traceability and volume pricing.
Supply support for TST20U45C 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 discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS devices, and MOSFETs since 1995.
The TST20UxxC series was developed to address efficiency and thermal challenges in high-density, high-frequency SMPS designs-targeting applications where low VF, high surge tolerance, and stable high-temperature operation are critical.
FAQ
What is the maximum junction temperature rating for the TST20U45C?
The TST20U45C has a maximum junction temperature (TJ) of +150°C, with operational capability from –55°C to +150°C. This rating is validated under rated forward current and specified thermal resistance conditions. The TST20U45C maintains stable electrical parameters-including forward voltage and reverse leakage-across this full range, enabling use in sealed or high-ambient industrial enclosures without derating below 125°C case temperature.
Does the TST20U45C have a center-tab cathode configuration?
Yes, the TST20U45C uses a TO-220AB package with center-tab cathode configuration: the metal tab is electrically connected to the cathode and serves as the primary thermal path. Leads 1 and 2 are anodes. Polarity is marked on the device body per datasheet diagram. Mounting torque must not exceed 0.56 N·m to avoid package damage or internal bond wire fracture.
How does the TST20U45C's forward voltage compare at elevated temperatures?
At 20A and 125°C, the TST20U45C exhibits a maximum forward voltage of 0.55V-significantly lower than conventional Schottky diodes that typically exceed 0.65V under identical conditions. This 0.10V advantage is enabled by Trench Schottky process optimization and ensures consistent efficiency in thermally demanding applications such as enclosed adapters or high-power density server PSUs where junction temperatures routinely reach 125°C.
Is the TST20U45C suitable for use in USB-C Power Delivery designs?
Yes, the TST20U45C is suitable for USB-C PD fast charger output stages, particularly in 20V PPS or 28V EPR implementations. Its 10,000 V/μs dv/dt rating prevents false turn-on during GaN FET switching edges, and its 0.60V VF at 20A minimizes conduction loss in high-current, high-frequency buck-derived topologies. The TST20U45C also meets halogen-free and RoHS requirements mandated for consumer USB-C accessories.
What packaging and reel options are available for the TST20U45C?
The TST20U45C is supplied in TO-220AB package packed 50 units per tube. Tape-and-reel packaging is not offered for this part number; only tube format is available per Taiwan Semiconductor's ordering code TST20UxC. Each tube includes date code (YWW), factory code (F), and green compound marking (G) per JEDEC standards. No bulk or ammo-pack options are supported.
TST20U45C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 45 V
- Current - Average Rectified (Io):
- 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
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AB
- Operating Temperature - Junction:
- -55°C ~ 150°C
TST20U45C FAQ
1.How can I place an order for TST20U45C through Aetrix?
Please submit a Request for Quotation (RFQ) for TST20U45C 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 TST20U45C reliable?
The price and inventory of TST20U45C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TST20U45C is usually 5 days.
3.What payment methods are accepted for TST20U45C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TST20U45C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TST20U45C?
TST20U45C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TST20U45C 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 TST20U45C?
For technical support, including TST20U45C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TST20U45C requirements.
6.How does Aetrix verify that TST20U45C is sourced from the original manufacturer or authorized distributors?
All TST20U45C 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 TST20U45C meets industry standards.
7.What is the process for return or replacement of TST20U45C?
All TST20U45C units undergo pre-shipment inspection (PSI). If there is an issue with TST20U45C, 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 TST20U45C part is unused and in its original packaging.
Return procedure for TST20U45C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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