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Taiwan Semiconductor Corporation TUAU4KH
- Part No.:
- TUAU4KH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-277, 3-PowerDFN
- Datasheet:
-
TUAU4KH.pdf
- Description:
- 75NS, 4A, 800V, HIGH EFFICIENT R
- Quantity:
- Payment:
- Shipping:
Inventory:5,850
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Product details
Overview
TUAU4KH from Taiwan Semiconductor is a 4A, 800V high-efficiency surface-mount ultrafast rectifier in TO-277A (SMPC4.6U) package, featuring 1.36V forward voltage at 4A/25°C, 75ns reverse recovery time, and AEC-Q101 qualification for automotive use in snubber and freewheeling circuits.
For engineers reviewing the TUAU4KH datasheet, TUAU4KH pinout, TUAU4KH application, or TUAU4KH equivalent, key selection criteria include its 800V VRRM, wettable flank terminals, JESD201 Class 2 whisker resistance, 170A IFSM (1ms), and 18µA reverse leakage at 125°C under rated VR.
Technical Context
The TUAU4KH is a single-die, glass-passivated ultrafast recovery rectifier optimized for high-frequency switching in DC-DC converters and automotive lighting. Its 75ns trr and low 33pF junction capacitance enable efficient operation above 100kHz while maintaining low conduction loss.
Thermally, it delivers RθJL = 5.1°C/W and RθJA = 45°C/W on a 16mm × 16mm Cu pad, supporting continuous 4A operation up to 150°C junction temperature with derating beyond that point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 800 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 400–600V bus applications with margin. |
| IF | 4 A - Continuous average forward current; supports compact thermal design in space-constrained automotive modules. |
| trr | 75 ns - Ultrafast reverse recovery time; minimizes switching losses in high-frequency (>100 kHz) SMPS topologies. |
| VF @ 4A, 25°C | 1.36 V - Forward voltage drop; determines conduction loss (5.44W at full load) and thermal rise in freewheeling paths. |
| IR @ VR, 125°C | 18 µA - Reverse leakage current; critical for low-power standby efficiency and thermal stability in hot under-hood environments. |
| CJ | 33 pF - Junction capacitance at 1MHz/4V; reduces capacitive coupling noise and EMI in high-dv/dt snubber networks. |
| IFSM (1ms) | 170 A - Non-repetitive surge current rating; enables robust handling of inductive kickback in motor drive freewheeling. |
Pinout & Package
Package: TO-277A (SMPC4.6U) - Surface-mount, wettable flank, single-anode/single-cathode configuration with cathode band polarity marking and matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input terminal | Connected to lower-potential side of load or switch node; requires thermal relief pad for heat dissipation. |
| Cathode | Forward current output / reverse-blocking terminal | Marked by visible band; ties to higher-potential rail or switching node; wettable flank enables automated optical inspection (AOI). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock per AEC standard. |
| Glass passivated junction | Enhances moisture resistance and long-term stability in humid under-hood environments without hermetic sealing. |
| Wettable flank terminals | Enables reliable solder joint inspection via AOI and improves reflow yield in automated SMT assembly lines. |
| High surge capability (170A, 1ms) | Withstands transient overcurrents during motor startup or inductive load interruption without degradation. |
| Junction temperature range | -55°C to +150°C operation - supports deployment in engine control units and headlamp drivers with minimal derating. |
Applications
| DC-DC Converter | Automotive Lighting |
|---|---|
Use Scenario: High-frequency isolated flyback or forward converter in 12V/48V automotive power supplies. IC Role / Device Role / Timing Role: Output rectifier handling 4A continuous current with minimal voltage drop and fast recovery to reduce switching losses. Use Value: 1.36V VF at 4A and 75ns trr directly improve conversion efficiency >92% at 200kHz switching frequency. | Use Scenario: LED headlamp driver with PWM dimming and inductive energy recycling. IC Role / Device Role / Timing Role: Freewheeling diode across buck inductor to clamp back-EMF and recover stored energy. Use Value: 170A IFSM withstands lamp cold-start surges; 150°C TJMAX ensures stable operation near hot optics. |
| Snubber Network | Freewheeling Application |
Use Scenario: RC-D snubber across MOSFETs in high-voltage gate driver stages. IC Role / Device Role / Timing Role: Fast-recovery clamping diode limiting dv/dt stress and absorbing turn-off energy. Use Value: 33pF CJ and 75ns trr minimize parasitic resonance and ensure clean voltage transitions. | Use Scenario: Inductive load switching in HVAC actuators or fuel pump controllers. IC Role / Device Role / Timing Role: Unidirectional path for inductor current decay when main switch opens. Use Value: Glass passivation and AEC-Q101 qualification guarantee 15+ year field life in vibration-prone chassis locations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultrafast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH4R08DJF | 800V VRRM, 4A IF, 75ns trr, but TO-277A package lacks wettable flanks and AEC-Q101 certification. | Suitable for industrial DC-DC where automotive qualification is not required; no AOI support. | Select when cost sensitivity outweighs automotive compliance and automated inspection needs. |
| VS-4EYH08-M3 | 800V VRRM, 4A IF, 60ns trr, TO-277A, AEC-Q101 qualified, but 1.45V VF @ 4A increases conduction loss by ~7%. | Better for highest-frequency snubbers needing fastest recovery; less optimal for thermally constrained freewheeling. | Prefer when trr < 65ns is mandatory and 0.09V higher VF is acceptable in thermal budget. |
Compared with STTH4R08DJF and VS-4EYH08-M3, the TUAU4KH uniquely combines AEC-Q101 qualification, wettable flank terminals, and balanced 1.36V/75ns performance-making it the optimal choice for automotive production requiring both reliability assurance and SMT process compatibility.
Availability
TUAU4KH is available at Aetrix Electronics and suitable for automotive lighting, DC-DC converter, and snubber applications requiring stable component supply, traceable sourcing, and lifecycle continuity management.
Supply support for TUAU4KH 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 automotive, industrial, and consumer markets since 1979.
The TUAU4xH family was designed specifically for high-reliability automotive power conversion, emphasizing AEC-Q101 compliance, thermal robustness, and surface-mount manufacturability in harsh environments.
FAQ
What is the maximum junction temperature rating for the TUAU4KH?
The TUAU4KH has a maximum junction temperature (TJ) rating of +150°C, with storage temperature ranging from –55°C to +150°C. This rating applies across its full voltage range (800V VRRM) and supports operation in under-hood automotive environments when mounted on a 16mm × 16mm copper pad per datasheet thermal test conditions. The TUAU4KH must be derated above 150°C.
Is the TUAU4KH pin-compatible with other devices in the TUAU4xH series?
Yes, all TUAU4xH variants-including TUAU4DH, TUAU4GH, TUAU4JH, TUAU4KH, and TUAU4MH-share identical TO-277A (SMPC4.6U) packaging, pinout, and mechanical footprint. Only the VRRM rating and associated electrical parameters differ; the TUAU4KH uses marking code "AU4K" and supports 800V blocking.
Does the TUAU4KH meet RoHS and halogen-free requirements?
Yes, the TUAU4KH is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and terminals are matte tin plated per J-STD-002 solderability standards. Moisture sensitivity level is rated at Level 1 per J-STD-020.
What is the reverse recovery time (trr) specification for the TUAU4KH?
The TUAU4KH has a maximum reverse recovery time (trr) of 75 ns, measured at IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A. This ultrafast recovery enables high-efficiency operation in switching power supplies operating above 100 kHz, reducing switching losses compared to standard recovery rectifiers.
Can the TUAU4KH be used in non-automotive applications?
Yes, the TUAU4KH is suitable for industrial and commercial applications including DC-DC converters, snubbers, and freewheeling circuits where its 800V VRRM, 4A IF, and 75ns trr provide performance advantages. While AEC-Q101 qualified, its specifications and reliability features also benefit demanding non-automotive systems requiring long-term stability and thermal resilience.
TUAU4KH 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:
- 1.9 V @ 4 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 75 ns
- Current - Reverse Leakage @ Vr:
- 5 µA @ 800 V
- Capacitance @ Vr, F:
- 33pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMPC4.6U
- Operating Temperature - Junction:
- -55°C ~ 150°C
TUAU4KH FAQ
1.How can I place an order for TUAU4KH through Aetrix?
Please submit a Request for Quotation (RFQ) for TUAU4KH 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 TUAU4KH reliable?
The price and inventory of TUAU4KH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TUAU4KH is usually 5 days.
3.What payment methods are accepted for TUAU4KH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TUAU4KH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TUAU4KH?
TUAU4KH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TUAU4KH 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 TUAU4KH?
For technical support, including TUAU4KH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TUAU4KH requirements.
6.How does Aetrix verify that TUAU4KH is sourced from the original manufacturer or authorized distributors?
All TUAU4KH 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 TUAU4KH meets industry standards.
7.What is the process for return or replacement of TUAU4KH?
All TUAU4KH units undergo pre-shipment inspection (PSI). If there is an issue with TUAU4KH, 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 TUAU4KH part is unused and in its original packaging.
Return procedure for TUAU4KH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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