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Taiwan Semiconductor Corporation TUAS4KH
- Part No.:
- TUAS4KH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
TUAS4KH.pdf
- Description:
- 4A, 800V, STANDARD RECOVERY RECT
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
TUAS4KH from Taiwan Semiconductor is a 4A, 800V repetitive peak reverse voltage (VRRM) surface-mount standard rectifier in TO-277A (SMPC4.6U) package, featuring glass passivated junction, AEC-Q101 qualification, and wettable flanks for automotive-grade solder joint inspection. It delivers 120A surge current capability (t = 8.3ms), 0.95V typical forward voltage at 4A/25°C, and operates up to 150°C junction temperature - deployed in DC-DC converters and car lighting systems.
For engineers reviewing the TUAS4KH datasheet, TUAS4KH pinout, TUAS4KH application, or TUAS4KH equivalent, key selection criteria include its 800V VRRM, TO-277A thermal performance (RθJL = 5.2°C/W), AEC-Q101 compliance, wettable flank geometry, and 0.95V/4A forward voltage specification under automotive ambient conditions.
Technical Context
The TUAS4KH is a single-die, silicon planar junction standard rectifier optimized for high-reliability automotive power conversion. Its glass passivation ensures stable reverse leakage (<5 µA at 25°C, <10 µA at 125°C) and robustness against humidity and contamination.
Thermally, it relies on direct lead-frame conduction via TO-277A's exposed cathode pad, achieving RθJL = 5.2°C/W when mounted on a 16 mm × 16 mm Cu pad - enabling sustained 4A average forward current with controlled junction rise under pulsed or continuous loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - maximum repetitive reverse blocking voltage; defines safe operating range in snubber or flyback clamp circuits |
| IF | 4 A - continuous average forward current rating at TL = 115°C; determines steady-state power handling in DC-DC output stages |
| IFSM | 120 A (8.3 ms) - non-repetitive surge current; supports inrush and transient overload tolerance without failure |
| VF | 0.95 V @ 4A, 25°C - forward drop directly impacts conduction loss and thermal design margin in high-efficiency converters |
| CJ | 28 pF @ 1 MHz, 4 V - junction capacitance affects high-frequency switching noise and EMI in fast-switching topologies |
| RθJL | 5.2 °C/W - low junction-to-lead thermal resistance enables efficient heat transfer to PCB copper, critical for automotive under-hood reliability |
| TJ max | 150 °C - maximum allowable junction temperature; sets upper limit for thermal design in sealed or high-ambient environments |
Pinout & Package
TO-277A (SMPC4.6U) is a 3-terminal surface-mount package with an exposed cathode pad for thermal and electrical connection. Cathode polarity is marked by a band on the device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Input current entry point | Connected to high-side switching node or transformer secondary; must withstand full VRRM during reverse bias |
| Cathode (Lead 2 + Exposed Pad) | Output current exit point | Primary thermal path to PCB; electrically tied to output rail and ground plane - requires full-solder coverage for reliability |
| Case / Exposed Pad | Cathode terminal extension | Not isolated - serves as both thermal interface and current-carrying cathode; mandatory for meeting RθJL spec and AEC-Q101 wettable flank requirement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and bond wire pull - enables use in engine control, lighting, and ADAS subsystems |
| Glass passivated junction | Hermetically seals chip surface against moisture ingress and ionic contamination, ensuring long-term IR stability in humid under-hood environments |
| Wettable flank | Vertical sidewall plating enables automated optical inspection (AOI) of solder fillet formation - required for IPC-A-610 Class 3 automotive assembly |
| High IFSM (120 A) | Withstands 8.3 ms half-sine surges common in load dump or inductive kick events without parametric shift or catastrophic failure |
| Moisture sensitivity level 1 | No floor life limitation or baking requirement before reflow - simplifies SMT line logistics and reduces handling risk |
Applications
| DC-DC Converter Output Rectification | Automotive LED Headlamp Driver |
|---|---|
Use Scenario: High-efficiency 12V–48V buck-derived DC-DC stage supplying constant current to multi-string LED arrays. IC Role / Device Role / Timing Role: Primary output rectifier conducting continuous 4A average current with minimal conduction loss. Use Value: 0.95V VF at 4A reduces power dissipation vs. higher-drop alternatives, enabling smaller heatsinking and higher power density in constrained headlamp modules. | Use Scenario: Reverse-polarity protection and freewheeling path in boost-based LED driver IC feedback loop. IC Role / Device Role / Timing Role: Snubber diode clamping inductive energy during MOSFET turn-off in high-side switch configuration. Use Value: 800V VRRM and 120A IFSM safely absorb flyback spikes from 48V automotive bus transients without derating. |
| Car Interior Lighting Power Supply | Engine Control Unit (ECU) Auxiliary Rail Protection |
Use Scenario: Low-noise 5V/3.3V auxiliary supply derived from vehicle battery using synchronous rectified flyback topology. IC Role / Device Role / Timing Role: Secondary-side rectifier synchronized with controller timing to minimize switching loss. Use Value: 28 pF junction capacitance limits capacitive coupling of switching noise into sensitive analog sensor rails, improving EMC performance. | Use Scenario: Input protection and back-EMF suppression for solenoid drivers and CAN transceiver power domains. IC Role / Device Role / Timing Role: Clamp diode across inductive loads to prevent voltage overshoot beyond 800V during rapid current interruption. Use Value: AEC-Q101 qualification and -55°C to +150°C operation ensure functional safety compliance across full automotive temperature range. |
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-4EWH08-M3/45 | Same TO-277A package, 4A/800V, but not AEC-Q101 qualified; RθJL = 6.0°C/W; VF = 0.98V @ 4A | Lacks automotive qualification; suitable for industrial/commercial DC-DC where AEC-Q101 is not mandated | Select if cost-sensitive and automotive qualification is unnecessary; verify thermal margin due to higher RθJL |
| ON Semiconductor MUR480G | TO-220AC package (through-hole), 4A/800V, ultrafast recovery (trr = 75 ns); no wettable flank or AEC-Q101 | Designed for higher-frequency SMPS with faster switching; incompatible with SMT-only lines requiring TO-277A footprint | Choose only when ultrafast recovery is required and through-hole assembly is acceptable; not a drop-in replacement |
Compared with VS-4EWH08-M3/45 and MUR480G, the TUAS4KH uniquely combines AEC-Q101 qualification, wettable flank geometry, and 5.2°C/W RθJL in TO-277A - making it the only option qualified for automated optical inspection and thermal-critical automotive SMT applications.
Availability
TUAS4KH is available at Aetrix Electronics and suitable for automotive LED lighting, DC-DC converter output rectification, and ECU auxiliary rail protection requiring stable component supply, AEC-Q101 compliance, and TO-277A surface-mount compatibility.
Supply support for TUAS4KH 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs, with global distribution and automotive qualification capabilities.
The TUAS4xH series is designed specifically for AEC-Q101-compliant automotive power conversion - emphasizing thermal robustness, solder joint inspectability, and reliability under extended temperature and humidity stress.
FAQ
What is the peak repetitive reverse voltage rating for TUAS4KH?
The TUAS4KH has a peak repetitive reverse voltage (VRRM) rating of 800 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version A2111). This value defines the maximum reverse-biased voltage the device can block repeatedly without breakdown and is strictly assigned to the TUAS4KH variant - distinct from TUAS4DH (200 V) or TUAS4MH (1000 V).
Is TUAS4KH qualified for automotive applications?
Yes, TUAS4KH is AEC-Q101 qualified per the manufacturer's documentation. This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and bond wire pull. The TUAS4KH meets these requirements in its TO-277A package with wettable flanks, making it suitable for under-hood and interior automotive systems.
What is the forward voltage of TUAS4KH at rated current and temperature?
The TUAS4KH exhibits a typical forward voltage (VF) of 0.95 V at 4 A and 25°C, with a maximum of 1.10 V under the same conditions. At elevated junction temperature (125°C), VF drops to 0.85 V typical. These values are measured per pulse test (PW = 0.3 ms) and are specified in the Electrical Specifications table of the TUAS4DH–TUAS4MH datasheet.
Does TUAS4KH have wettable flanks, and why does it matter?
Yes, TUAS4KH features wettable flanks on its TO-277A package - verified in the Mechanical Data section and explicitly listed under FEATURES. This allows automated optical inspection (AOI) of solder fillet formation on the vertical side walls during SMT assembly, a requirement for IPC-A-610 Class 3 and automotive manufacturing standards to ensure solder joint integrity and long-term reliability.
What is the thermal resistance from junction to lead (RθJL) for TUAS4KH?
The junction-to-lead thermal resistance (RθJL) for TUAS4KH is 5.2°C/W, measured with the device mounted on a 16 mm × 16 mm copper pad PCB per JESD51-3. This value is identical across the TUAS4DH–TUAS4MH family and reflects the efficiency of heat transfer from the die to the PCB via the exposed cathode pad - a critical parameter for thermal design in space-constrained automotive modules.
TUAS4KH 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):
- 4A
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 4 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Capacitance @ Vr, F:
- 28pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMPC4.6U
- Operating Temperature - Junction:
- -55°C ~ 150°C
TUAS4KH FAQ
1.How can I place an order for TUAS4KH through Aetrix?
Please submit a Request for Quotation (RFQ) for TUAS4KH 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 TUAS4KH reliable?
The price and inventory of TUAS4KH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TUAS4KH is usually 5 days.
3.What payment methods are accepted for TUAS4KH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TUAS4KH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TUAS4KH?
TUAS4KH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TUAS4KH 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 TUAS4KH?
For technical support, including TUAS4KH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TUAS4KH requirements.
6.How does Aetrix verify that TUAS4KH is sourced from the original manufacturer or authorized distributors?
All TUAS4KH 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 TUAS4KH meets industry standards.
7.What is the process for return or replacement of TUAS4KH?
All TUAS4KH units undergo pre-shipment inspection (PSI). If there is an issue with TUAS4KH, 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 TUAS4KH part is unused and in its original packaging.
Return procedure for TUAS4KH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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