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Taiwan Semiconductor Corporation TUAS8K
- Part No.:
- TUAS8K
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
TUAS8K.pdf
- Description:
- DIODE GEN PURP 800V 8A SMPC4.6U
- Quantity:
- Payment:
- Shipping:
Inventory:1,179
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Product details
Overview
TUAS8K from Taiwan Semiconductor is an 8A, 800V standard surface-mount rectifier diode in TO-277A (SMPC4.6U) package, featuring low forward voltage (0.97V at 8A/25°C), 230A surge rating, and 4°C/W junction-to-lead thermal resistance. It serves as the primary AC-to-DC conversion element in high-efficiency switching power supplies.
For engineers reviewing the TUAS8K datasheet, TUAS8K pinout, TUAS8K application, or TUAS8K equivalent, key selection criteria include its 800V VRRM rating, wettable flank terminals for automated optical inspection, J-STD-020 Level 1 moisture sensitivity, and compatibility with reflow soldering on 16mm × 16mm Cu pad PCBs.
Technical Context
The TUAS8K is a single-die, silicon planar junction standard rectifier optimized for high-current, medium-voltage DC–DC converters and SMPS front-end rectification. Its 54pF junction capacitance at 1MHz/4V and 0.87V forward voltage at 8A/125°C support stable high-frequency operation with minimal switching loss.
Thermally, it delivers 4°C/W RθJL when mounted on a standardized test board, enabling reliable 8A continuous conduction without forced air cooling. The cathode-band polarity marking and matte tin-plated leads ensure unambiguous orientation and solderability per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - Maximum repetitive reverse voltage before breakdown; defines safe operating range in 400–600V DC bus applications |
| IF | 8 A - Continuous forward current rating; supports sustained output in 100–200W SMPS designs |
| IFSM (8.3ms) | 230 A - Non-repetitive surge capability; withstands inrush during cold-start of industrial power modules |
| VF @ 8A/25°C | 0.97 V - Low conduction loss; reduces power dissipation to ≤7.8W at full load |
| RθJL | 4 °C/W - Efficient heat transfer to PCB copper; enables thermal management without heatsink in compact layouts |
| CJ @ 1MHz | 54 pF - Low junction capacitance; minimizes reverse recovery charge and EMI in >100kHz converters |
Pinout & Package
Package: TO-277A (SMPC4.6U) - Surface-mount, 3-terminal, single-anode/single-cathode configuration with wettable flank side terminals and cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input terminal for forward conduction path | Connected to AC input or transformer secondary; accepts up to 8A continuous current |
| Cathode | Output terminal for forward conduction path | Delivers rectified DC to bulk capacitor; marked by visible cathode band on package body |
| Exposed Pad (Cathode-side) | Thermal and electrical connection to cathode | Provides low-resistance thermal path to PCB copper; must be soldered to ≥16mm × 16mm Cu area |
Key Features
| Feature | Design Value |
|---|---|
| Wettable flank terminals | Enables automated optical inspection (AOI) of solder fillets on side edges, improving SMT process yield |
| J-STD-020 Level 1 moisture sensitivity | Zero bake requirement before reflow; simplifies manufacturing logistics and reduces handling cost |
| UL 94V-0 molding compound | Self-extinguishing encapsulation material; meets safety requirements for enclosed industrial power supplies |
| Matte tin-plated leads | RoHS-compliant, whisker-resistant termination; ensures reliable solder joint formation per J-STD-002 |
Applications
| AC–DC Front-End Rectification | High-Density DC–DC Converter |
|---|---|
Use Scenario: Rectifying 230VAC input in offline SMPS for telecom and server PSUs. IC Role / Device Role / Timing Role: Primary unidirectional current switch converting AC line to pulsating DC. Use Value: 800V VRRM safely handles 230VAC peak (≈325V) with 2.5× margin; 0.97V VF limits conduction loss to <8W at full load. | Use Scenario: Output rectification in isolated 48V–12V buck-derived DC–DC modules for data center racks. IC Role / Device Role / Timing Role: Secondary-side freewheeling diode in synchronous rectifier-assisted topology. Use Value: 54pF CJ minimizes reverse recovery noise; 4°C/W RθJL sustains 8A output without thermal derating on dense PCBs. |
| Industrial Motor Drive Power Supply | Renewable Energy Inverter Auxiliary PSU |
Use Scenario: Input rectification for 3-phase auxiliary power supply feeding gate drivers and MCU in VFDs. IC Role / Device Role / Timing Role: Three-phase bridge leg component delivering stable +15V/-15V rails. Use Value: 230A IFSM absorbs regenerative energy spikes; -55°C to +150°C TJ range supports operation in sealed enclosures. | Use Scenario: DC bus conditioning in solar microinverter control board power stage. IC Role / Device Role / Timing Role: Bulk rectifier feeding isolated flyback controller powering sensing and communication ICs. Use Value: Halogen-free and RoHS compliance meets IEC 61215 PV system environmental requirements; 0.104g weight aids lightweight module design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standard rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-8EWH08FN-M3 | Same 8A/800V rating, TO-277A package, but higher VF (1.05V @ 8A/25°C) and 5.5°C/W RθJL | Slightly lower efficiency and higher thermal impedance limit use in ultra-compact 125°C ambient designs | Preferred where Vishay supply chain alignment or qualification history is required |
| ON Semiconductor MUR880CT | 8A/800V, but dual common-cathode configuration in TO-220AC; no wettable flanks or J-STD-020 Level 1 rating | Requires through-hole assembly and manual AOI; unsuitable for fully automated SMT lines | Selected only when legacy TO-220 footprint reuse or dual-diode functionality is mandatory |
Compared with VS-8EWH08FN-M3 and MUR880CT, the TUAS8K offers superior thermal performance (4°C/W vs. 5.5°C/W), lower conduction loss (0.97V vs. 1.05V), and full SMT manufacturability-making it optimal for high-volume, space-constrained, and thermally demanding power supply designs.
Availability
TUAS8K is available at Aetrix Electronics and suitable for DC–DC converters, switching mode inverters, and industrial motor drive power supplies requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production lots.
Supply support for TUAS8K 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 diodes, and MOSFETs for industrial and computing markets.
The TUAS8K belongs to TSC's TUAS8x standard rectifier family, engineered specifically for high-reliability, high-efficiency AC–DC and DC–DC power conversion in automated SMT environments.
FAQ
What is the maximum junction temperature rating for the TUAS8K?
The TUAS8K has a maximum junction temperature (TJ) rating of +150°C, verified under steady-state conditions per absolute maximum ratings table. This allows continuous operation in sealed industrial enclosures where ambient temperatures reach 85–105°C, provided PCB thermal design maintains junction-to-lead resistance at ≤4°C/W as specified.
Does the TUAS8K support lead-free reflow soldering?
Yes, the TUAS8K features matte tin-plated leads qualified per J-STD-002 and is rated for lead-free reflow profiles up to 260°C peak. Its J-STD-020 Level 1 moisture sensitivity eliminates pre-bake requirements, enabling direct placement into standard Class 3 reflow ovens without humidity exposure concerns.
How does the TUAS8K's junction capacitance affect high-frequency converter design?
The TUAS8K exhibits 54pF typical junction capacitance at 1MHz and 4V reverse bias. This low value reduces displacement current during switching transitions, lowering EMI generation and minimizing reverse recovery losses in converters operating above 100kHz-critical for maintaining efficiency in compact 48V–12V DC–DC modules.
Is the TUAS8K pin-compatible with other members of the TUAS8x series?
Yes, all TUAS8x variants-including TUAS8D, TUAS8G, TUAS8J, TUAS8K, and TUAS8M-share identical TO-277A (SMPC4.6U) package dimensions, pinout, and thermal pad layout. Only the VRRM rating differs (200V to 1000V), allowing drop-in replacement during design validation or voltage-tier customization without PCB revision.
What is the meaning of the "AS8K" marking code on the TUAS8K device body?
The "AS8K" marking code laser-etched on the TUAS8K case identifies it as the 800V variant within the TUAS8x family. Per TSC documentation, "K" corresponds to 800V VRRM, distinguishing it from "D" (200V), "G" (400V), "J" (600V), and "M" (1000V); this code enables rapid visual verification during incoming inspection and assembly.
TUAS8K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-277, 3-PowerDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 800 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 8 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Capacitance @ Vr, F:
- 54pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMPC4.6U
- Operating Temperature - Junction:
- -55°C ~ 150°C
TUAS8K FAQ
1.How can I place an order for TUAS8K through Aetrix?
Please submit a Request for Quotation (RFQ) for TUAS8K 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 TUAS8K reliable?
The price and inventory of TUAS8K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TUAS8K is usually 5 days.
3.What payment methods are accepted for TUAS8K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TUAS8K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TUAS8K?
TUAS8K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TUAS8K 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 TUAS8K?
For technical support, including TUAS8K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TUAS8K requirements.
6.How does Aetrix verify that TUAS8K is sourced from the original manufacturer or authorized distributors?
All TUAS8K 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 TUAS8K meets industry standards.
7.What is the process for return or replacement of TUAS8K?
All TUAS8K units undergo pre-shipment inspection (PSI). If there is an issue with TUAS8K, 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 TUAS8K part is unused and in its original packaging.
Return procedure for TUAS8K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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