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Taiwan Semiconductor Corporation TUAS8G
- Part No.:
- TUAS8G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
TUAS8G.pdf
- Description:
- DIODE GEN PURP 400V 8A SMPC4.6U
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TUAS8G from Taiwan Semiconductor is an 8A, 400V standard surface-mount rectifier diode in TO-277A (SMPC4.6U) package, designed for high-efficiency DC-DC conversion and switching-mode power supplies. It features low forward voltage (0.96 V at 8A/25°C), 230A surge current capability, and a maximum junction temperature of 150°C.
For engineers reviewing the TUAS8G datasheet, TUAS8G pinout, TUAS8G application, or TUAS8G equivalent, key selection criteria include repetitive peak reverse voltage (400 V), thermal resistance (RθJL = 4°C/W), wettable flank terminals for automated optical inspection, and JESD201 Class 1 whisker compliance.
Technical Context
The TUAS8G is a single-die, silicon planar junction standard rectifier optimized for medium-voltage, medium-current switching applications. Its electrical behavior is defined by a typical forward voltage of 0.96 V at 8A/25°C and 0.87 V at 8A/125°C, with reverse leakage limited to 5 µA at 25°C and 60 µA at 125°C under rated VR.
Thermally, it delivers RθJL = 4°C/W and RθJC = 8°C/W when mounted on a 16 mm × 16 mm copper pad PCB, enabling reliable operation up to 150°C junction temperature. Its TO-277A package supports automated placement and provides wettable flank geometry for solder joint inspection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum repetitive reverse blocking voltage; defines safe operating range in flyback, boost, and bridge configurations |
| IF | 8 A - Continuous average forward current; determines steady-state power handling without heatsinking |
| IFSM (8.3 ms) | 230 A - Non-repetitive surge current rating; supports inrush and transient overload tolerance |
| VF @ 8A, 25°C | 0.96 V - Forward conduction loss; directly impacts conduction efficiency and thermal rise in high-duty-cycle operation |
| RθJL | 4 °C/W - Junction-to-lead thermal resistance; enables direct thermal coupling to PCB copper for passive cooling |
| CJ @ 1 MHz, 4 V | 62 pF - Junction capacitance; influences high-frequency switching losses and EMI in SMPS designs |
| TJ max | 150 °C - Maximum allowable junction temperature; sets derating envelope for ambient and layout-dependent thermal design |
Pinout & Package
Package: TO-277A (SMPC4.6U), surface-mount, single-anode/single-cathode configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability and JESD201 Class 1 whisker requirements. Wettable flank geometry supports automated optical inspection (AOI).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side of rectification path; requires adequate copper area for thermal dissipation |
| Cathode | Forward current exit point / reverse-blocking terminal | Marked by visible band; connects to output rail or switching node; carries full load current and must be routed with low-inductance layout |
Key Features
| Feature | Design Value |
|---|---|
| Wettable flank terminals | Enables reliable AOI detection of solder fillet integrity during SMT reflow, reducing post-process visual inspection overhead |
| J-STD-020 Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates baking requirement and simplifies manufacturing logistics |
| UL 94V-0 molding compound | Ensures flame-retardant encapsulation for safety-critical power supply designs compliant with IEC/EN 62368-1 |
| Halogen-free per IEC 61249-2-21 | Meets environmental compliance mandates for RoHS and WEEE without compromising thermal or mechanical robustness |
| Single-die construction | Delivers predictable forward voltage and thermal performance without parallel-device mismatch concerns |
Applications
| AC-DC Adapter Power Stage | Industrial DC-DC Converter Output Rectification |
|---|---|
Use Scenario: Secondary-side rectification in 36–75 W offline AC-DC adapters powering IoT gateways and smart sensors. IC Role / Device Role / Timing Role: Standard rectifier conducting unidirectional current after transformer secondary winding. Use Value: 0.96 V VF at 8A minimizes conduction loss and improves full-load efficiency beyond 88% at 230 VAC input. | Use Scenario: Output rectification in isolated 48 V input industrial DC-DC modules delivering 12 V/5 A to PLC I/O modules. IC Role / Device Role / Timing Role: Freewheeling and output rectification element in synchronous or quasi-resonant topologies. Use Value: 230 A IFSM withstands startup surges and short-circuit recovery events without degradation. |
| Solar Microinverter DC Link | Automotive Auxiliary Power Supply |
Use Scenario: DC link rectification in string-level solar microinverters converting panel output to 230 VAC. IC Role / Device Role / Timing Role: High-reliability rectifier in high-temperature, high-voltage DC bus conditioning stage. Use Value: 150°C TJmax and 400 V VRRM support operation under elevated ambient and partial shading conditions. | Use Scenario: 12 V auxiliary power supply rectification in vehicle infotainment head units with wide-input-range buck-boost front-end. IC Role / Device Role / Timing Role: Input rectifier handling cold-crank (6 V) to load-dump (40 V) transients in automotive-grade SMPS. Use Value: Wettable flank and JESD201 Class 1 whisker compliance ensure long-term solder joint reliability under thermal cycling and vibration stress. |
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-8EWH04FN-M3/45 | Same 400 V VRRM, 8 A IF, but TO-277A package with slightly higher VF (1.05 V @ 8A/25°C); RθJL = 5.5°C/W | Higher conduction loss reduces efficiency margin in thermally constrained layouts | Select if dual-sourcing required and layout allows for +0.09 V VF penalty and +1.5°C/W thermal resistance |
| ON Semiconductor MUR840G | Ultrafast recovery (trr = 60 ns vs. TUAS8G's ~150 ns), same 400 V/8 A rating, TO-277A package, VF = 1.15 V @ 8A/25°C | Better suited for high-frequency (>100 kHz) PFC or resonant converters where reverse recovery loss dominates | Select when switching frequency exceeds 75 kHz and reverse recovery energy reduction outweighs +0.19 V VF penalty |
Compared with VS-8EWH04FN-M3/45 and MUR840G, the TUAS8G offers the lowest forward voltage and best thermal resistance in its voltage class, making it optimal for efficiency- and thermally sensitive medium-frequency SMPS where ultrafast recovery is not required.
Availability
TUAS8G is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and general-purpose power rectification requiring stable component supply across industrial, telecom, and consumer electronics programs.
Supply support for TUAS8G 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, serving global power management and protection markets since 1979.
The TUAS8G belongs to TSC's TUASx series of standard rectifiers engineered for high-reliability, cost-optimized AC-DC and DC-DC power conversion in commercial and industrial environments.
FAQ
What is the maximum repetitive peak reverse voltage rating for TUAS8G?
The TUAS8G has a maximum repetitive peak reverse voltage (VRRM) of 400 V, as specified in the absolute maximum ratings table. This value is fixed for the TUAS8G variant and distinguishes it from other members of the TUAS8x family such as TUAS8D (200 V) and TUAS8J (600 V). Operating above 400 V risks irreversible avalanche breakdown.
Does TUAS8G support automated optical inspection (AOI) during SMT assembly?
Yes, the TUAS8G features wettable flank terminals per its TO-277A (SMPC4.6U) package specification. This geometry enables reliable solder fillet imaging for AOI systems, improving defect detection rates without requiring X-ray inspection. The device is also rated J-STD-020 Level 1, eliminating moisture sensitivity concerns during handling.
What is the forward voltage of TUAS8G at 8A and 125°C junction temperature?
The TUAS8G exhibits a typical forward voltage of 0.87 V at 8A and 125°C junction temperature, as confirmed in the electrical specifications table. This reduced VF versus room-temperature operation reflects the negative temperature coefficient of silicon diodes and supports stable performance in thermally demanding applications.
Is TUAS8G halogen-free and RoHS compliant?
Yes, the TUAS8G is both RoHS compliant and halogen-free in accordance with IEC 61249-2-21. Its molding compound and plating materials meet these environmental standards without sacrificing UL 94V-0 flammability rating or JESD201 Class 1 whisker resistance-critical for industrial and consumer end-equipment certifications.
What thermal resistance values apply to TUAS8G in standard PCB mounting?
When mounted on a 16 mm × 16 mm copper pad test board, the TUAS8G achieves RθJL = 4°C/W (junction-to-lead), RθJC = 8°C/W (junction-to-case), and RθJA = 38°C/W (junction-to-ambient). These values are measured under standardized JEDEC conditions and form the basis for thermal derating calculations in real-world layouts.
TUAS8G 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):
- 400 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 @ 400 V
- Capacitance @ Vr, F:
- 62pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMPC4.6U
- Operating Temperature - Junction:
- -55°C ~ 150°C
TUAS8G FAQ
1.How can I place an order for TUAS8G through Aetrix?
Please submit a Request for Quotation (RFQ) for TUAS8G 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 TUAS8G reliable?
The price and inventory of TUAS8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TUAS8G is usually 5 days.
3.What payment methods are accepted for TUAS8G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TUAS8G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TUAS8G?
TUAS8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TUAS8G 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 TUAS8G?
For technical support, including TUAS8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TUAS8G requirements.
6.How does Aetrix verify that TUAS8G is sourced from the original manufacturer or authorized distributors?
All TUAS8G 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 TUAS8G meets industry standards.
7.What is the process for return or replacement of TUAS8G?
All TUAS8G units undergo pre-shipment inspection (PSI). If there is an issue with TUAS8G, 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 TUAS8G part is unused and in its original packaging.
Return procedure for TUAS8G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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