My Inquiry
My Account
Taiwan Semiconductor Corporation TUAS8KH
- Part No.:
- TUAS8KH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
TUAS8KH.pdf
- Description:
- 8A, 800V, STANDARD RECOVERY RECT
- Quantity:
- Payment:
- Shipping:
Inventory:5,960
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TUAS8KH from Taiwan Semiconductor is an AEC-Q101-qualified 8A, 800V standard surface-mount rectifier in TO-277A (SMPC4.6U) package, featuring 0.96V forward voltage at 8A/25°C, 54pF junction capacitance at 1MHz/4V, and wettable flank terminals for automated optical inspection. It serves as a primary output rectifier in automotive DC-DC converters.
For engineers reviewing the TUAS8KH datasheet, TUAS8KH pinout, TUAS8KH application, or TUAS8KH equivalent, key selection criteria include its 800V VRRM, 230A IFSM surge rating, JESD201 Class 2 whisker resistance, moisture sensitivity level 1, and thermal resistance RθJL = 4°C/W for high-reliability automotive power conversion designs.
Technical Context
The TUAS8KH is a single-die, silicon planar junction standard rectifier optimized for high-efficiency, low-loss operation in automotive-grade power supplies. Its 800V repetitive peak reverse voltage and 150°C maximum junction temperature support robust operation under transient overvoltage and elevated ambient conditions.
Thermal performance is defined with RθJL = 4°C/W and RθJA = 38°C/W on a 16mm × 16mm copper pad PCB, enabling reliable power dissipation up to 8A average forward current. Junction capacitance of 54pF at 1MHz/4V supports stable snubber behavior in flyback and buck-derived topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 48V–60V automotive DC-DC outputs |
| IF | 8 A - Continuous average forward current; supports ≥100W output stages with appropriate heatsinking |
| IFSM (8.3ms) | 230 A - Non-repetitive surge current capability; withstands load dump transients per ISO 7637-2 |
| VF @ 8A/25°C | 0.96 V max - Low conduction loss reduces thermal stress and improves system efficiency vs. higher-VF alternatives |
| CJ @ 1MHz/4V | 54 pF - Enables predictable snubber design and minimizes switching node ringing in high-frequency converters |
| RθJL | 4 °C/W - Low junction-to-lead thermal resistance allows direct thermal coupling to PCB copper for passive cooling |
| AEC-Q101 | Qualified - Meets stress test requirements for automotive electronics including temperature cycling, HTRB, and UHAST |
Pinout & Package
TO-277A (SMPC4.6U) surface-mount package with cathode-indicating band; matte tin-plated wettable flank leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input current terminal | Connected to transformer secondary or switch node; accepts 8A continuous forward current |
| Cathode | Output current terminal | Delivers rectified DC to filter capacitor; marked by visible cathode band on device body |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood environments including thermal cycling, humidity bias, and mechanical shock |
| Wettable flank leads | Enables automated optical inspection (AOI) of solder joints without X-ray, reducing manufacturing defect escape |
| Moisture sensitivity level 1 | No baking required before reflow; simplifies SMT line handling and eliminates moisture-related popcorning risk |
| UL 94V-0 molding compound | Self-extinguishing encapsulation meets automotive flammability safety standards for under-hood placement |
| Single-die construction | Minimizes parasitic inductance vs. multi-die packages, improving high-frequency rectification stability |
Applications
| Automotive DC-DC Converter | LED Headlamp Driver |
|---|---|
Use Scenario: Step-down conversion from 48V battery to 12V auxiliary rail in mild-hybrid vehicles. IC Role / Device Role / Timing Role: Primary output rectifier in synchronous or quasi-resonant flyback topology. Use Value: 800V VRRM accommodates 48V system transients; 0.96V VF reduces conduction loss and thermal derating burden. | Use Scenario: Constant-current LED driver powering high-intensity headlamps with PWM dimming. IC Role / Device Role / Timing Role: Output rectifier in boost-derived constant-current stage with fast transient response. Use Value: 54pF CJ limits switching node oscillation during PWM edge transitions, improving EMI compliance. |
| Snubber Network | On-Board Charger (OBC) Auxiliary Supply |
Use Scenario: RC snubber across MOSFET drain-source in 3.3kW OBC PFC stage. IC Role / Device Role / Timing Role: Voltage-clamping diode absorbing turn-off energy from inductive leakage. Use Value: 230A IFSM handles single-pulse energy spikes without degradation; 150°C TJMAX sustains reliability under repeated surges. | Use Scenario: Auxiliary 12V supply generation from high-voltage DC bus for OBC control logic and gate drivers. IC Role / Device Role / Timing Role: Isolated output rectifier in flyback converter powering MCU, sensors, and communication ICs. Use Value: RθJL = 4°C/W enables direct PCB copper thermal path, eliminating need for discrete thermal vias in space-constrained modules. |
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-M3/45 | 8A, 800V, TO-277A, VF = 0.92V @ 8A/25°C, CJ = 60pF, not AEC-Q101 qualified | Industrial-grade only; lacks automotive qualification and wettable flank leads | Select when AEC-Q101 is not required and lower VF is prioritized over AOI compatibility |
| ON Semiconductor MUR880CT | 8A, 800V, TO-220AC, VF = 1.15V @ 8A/25°C, RθJA = 50°C/W, AEC-Q101 qualified | Through-hole package; higher thermal resistance and no wettable flank for AOI | Select when legacy through-hole assembly is mandated and board-level AOI is unavailable |
Compared with VS-8EWH08FN-M3/45 and MUR880CT, the TUAS8KH uniquely combines AEC-Q101 qualification, wettable flank leads, and 4°C/W RθJL in a surface-mount TO-277A package-enabling automotive-grade reliability, automated optical inspection, and superior thermal coupling in space-constrained modules.
Availability
TUAS8KH is available at Aetrix Electronics and suitable for automotive DC-DC converters, LED headlamp drivers, and snubber networks requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for TUAS8KH 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 devices, TVS diodes, and rectifiers for industrial and automotive markets.
The TUAS8xH series was designed specifically for AEC-Q101-compliant automotive power conversion, emphasizing low VF, robust surge capability, and manufacturability in high-volume SMT lines with AOI validation.
FAQ
What is the maximum junction temperature rating for TUAS8KH?
The TUAS8KH has a maximum junction temperature (TJMAX) of +150°C, validated per AEC-Q101 stress testing. This rating enables reliable operation in under-hood automotive environments where ambient temperatures exceed 105°C, provided thermal design maintains junction temperature below this limit using the specified RθJL = 4°C/W path to PCB copper.
Is TUAS8KH pin-compatible with other members of the TUAS8xH family?
Yes, all TUAS8xH variants-including TUAS8DH, TUAS8GH, TUAS8JH, TUAS8KH, and TUAS8MH-share identical TO-277A (SMPC4.6U) package dimensions, pinout, and thermal footprint. The only difference is VRRM rating (200V to 1000V), allowing drop-in replacement within the same voltage design margin without layout changes.
Does TUAS8KH require baking before reflow soldering?
No, TUAS8KH has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH without baking. This eliminates pre-reflow baking steps, reducing SMT line complexity and avoiding moisture-induced defects like popcorning during reflow.
What is the significance of the wettable flank feature on TUAS8KH?
The wettable flank on TUAS8KH provides extended vertical solderable surfaces on the side edges of the leads, enabling automated optical inspection (AOI) of solder joint quality without requiring X-ray. This feature directly supports zero-defect manufacturing goals in automotive electronics production lines where full solder joint visibility is mandatory.
How does the junction capacitance of TUAS8KH affect EMI performance?
The TUAS8KH exhibits 54pF junction capacitance at 1MHz/4V, which stabilizes snubber behavior and suppresses high-frequency ringing at switching nodes. In flyback or boost converters, this value helps maintain controlled dV/dt during turn-off, reducing conducted and radiated EMI emissions compared to higher-CJ rectifiers such as the TUAS8DH (62pF).
TUAS8KH 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMPC4.6U
- Operating Temperature - Junction:
- -55°C ~ 150°C
TUAS8KH FAQ
1.How can I place an order for TUAS8KH through Aetrix?
Please submit a Request for Quotation (RFQ) for TUAS8KH 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 TUAS8KH reliable?
The price and inventory of TUAS8KH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TUAS8KH is usually 5 days.
3.What payment methods are accepted for TUAS8KH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TUAS8KH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TUAS8KH?
TUAS8KH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TUAS8KH 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 TUAS8KH?
For technical support, including TUAS8KH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TUAS8KH requirements.
6.How does Aetrix verify that TUAS8KH is sourced from the original manufacturer or authorized distributors?
All TUAS8KH 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 TUAS8KH meets industry standards.
7.What is the process for return or replacement of TUAS8KH?
All TUAS8KH units undergo pre-shipment inspection (PSI). If there is an issue with TUAS8KH, 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 TUAS8KH part is unused and in its original packaging.
Return procedure for TUAS8KH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TUAS8KH Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
