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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation TUAU8KH

Name: TUAU8KH
Brand: Taiwan Semiconductor Corporation
SKU: TUAU8KH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TUAU8KH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: TO-277, 3-PowerDFN

Datasheet:: TUAU8KH.pdf

Description:: 80NS, 8A, 800V, HIGH EFFICIENT R

Quantity:: RFQ Add To RFQ list

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Inventory:6,000

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Product details

Overview

TUAU8KH from Taiwan Semiconductor is an AEC-Q101-qualified, high-efficiency surface-mount rectifier with 800 V repetitive peak reverse voltage (V_RRM), 8 A average forward current (I_F), and 140 A surge capability (I_FSM). It features a TO-277A (SMPC4.6U) package with wettable flanks, glass-passivated junction, and 80 ns reverse recovery time (t_rr), optimized for automotive snubber and freewheeling circuits.

For engineers reviewing the TUAU8KH datasheet, TUAU8KH pinout, TUAU8KH application, or TUAU8KH equivalent, key selection criteria include its 800 V V_RRM, 1.48 V forward voltage at 8 A/25°C, 25 µA reverse leakage at 125°C, 43 pF junction capacitance, and thermal resistance of 5.5 °C/W (junction-to-lead).

Technical Context

The TUAU8KH is a single-die, fast-recovery silicon rectifier designed for high-voltage DC–DC conversion in thermally constrained automotive environments. Its 800 V V_RRM rating supports 560 V RMS reverse voltage, while its 80 ns t_rr enables efficient switching in snubber networks and freewheeling paths where di/dt stress must be minimized.

Thermal performance is defined by R_θJL = 5.5 °C/W and R_θJA = 48 °C/W on a 16 mm × 16 mm Cu pad PCB. Junction temperature range is –55°C to +150°C, with moisture sensitivity level 1 per J-STD-020 and matte tin-plated leads compliant with J-STD-002 solderability.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	800 V - supports 560 V RMS input in isolated DC–DC converters without derating
I_F	8 A continuous - delivers full rated current up to 150°C junction temperature
t_rr	80 ns - reduces switching losses and voltage overshoot in high-frequency freewheeling
V_F @ 8 A, 25°C	1.48 V max - defines conduction loss budget in 12–48 V automotive power rails
I_R @ 800 V, 125°C	25 µA max - ensures low standby leakage in high-temperature engine bay applications
C_J @ 1 MHz, 4 V	43 pF - minimizes capacitive coupling noise in EMI-sensitive lighting and ADAS subsystems
R_θJL	5.5 °C/W - enables direct thermal coupling to copper pour for passive cooling in space-constrained modules

Pinout & Package

Package: TO-277A (SMPC4.6U), surface-mount, single-anode/single-cathode configuration with cathode band polarity marking and wettable flank terminals.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry point during forward conduction	Connected to lower-potential side (e.g., switch node in buck freewheel path)
Cathode	Current exit point during forward conduction	Connected to higher-potential rail (e.g., output capacitor positive terminal)

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock
Glass-passivated junction	Prevents moisture-induced degradation and improves long-term reliability in humid environments
Wettable flank terminals	Enables automated optical inspection (AOI) of solder joint integrity on bottom-side terminations
140 A I_FSM (8.3 ms)	Withstands transient overcurrent events such as load dump or inductive kickback without failure
Junction temp limit: –55°C to +150°C	Supports operation in extreme ambient conditions typical of automotive engine compartments

Applications

Automotive DC–DC Converters	LED Headlamp Drivers
Use Scenario: High-efficiency 12 V to 48 V bidirectional DC–DC conversion in 48 V mild-hybrid systems. IC Role / Device Role / Timing Role: Freewheeling rectifier in synchronous buck-boost topology, handling 8 A continuous current at 200–500 kHz switching frequency. Use Value: 80 ns t_rr and 1.48 V V_F reduce switching and conduction losses, improving system efficiency by ≥1.2% versus slower 600 V alternatives.	Use Scenario: Constant-current LED driver for adaptive front-lighting systems (AFS) with PWM dimming. IC Role / Device Role / Timing Role: Snubber diode across MOSFET switches to clamp voltage spikes during turn-off. Use Value: 800 V V_RRM and 140 A I_FSM suppress transients up to 100 V/µs without avalanche breakdown or thermal runaway.
Engine Control Unit Power Supplies	Start–Stop System Energy Recovery
Use Scenario: Input rectification and hold-up in 5 V/3.3 V auxiliary supplies powered from vehicle battery. IC Role / Device Role / Timing Role: Primary rectifier in bridgeless PFC or offline flyback front-end stage. Use Value: 25 µA I_R at 125°C prevents excessive standby current drain during extended parking periods.	Use Scenario: Regenerative braking energy recapture into 48 V storage in start–stop systems. IC Role / Device Role / Timing Role: Unidirectional energy transfer rectifier in bidirectional buck–boost converter. Use Value: TO-277A package with wettable flanks ensures reliable reflow soldering and thermal cycling endurance over 10,000 cycles.

Automotive DC–DC Converters

LED Headlamp Drivers

Use Scenario: High-efficiency 12 V to 48 V bidirectional DC–DC conversion in 48 V mild-hybrid systems.

IC Role / Device Role / Timing Role: Freewheeling rectifier in synchronous buck-boost topology, handling 8 A continuous current at 200–500 kHz switching frequency.

Use Value: 80 ns t_rr and 1.48 V V_F reduce switching and conduction losses, improving system efficiency by ≥1.2% versus slower 600 V alternatives.

Use Scenario: Constant-current LED driver for adaptive front-lighting systems (AFS) with PWM dimming.

IC Role / Device Role / Timing Role: Snubber diode across MOSFET switches to clamp voltage spikes during turn-off.

Use Value: 800 V V_RRM and 140 A I_FSM suppress transients up to 100 V/µs without avalanche breakdown or thermal runaway.

Engine Control Unit Power Supplies

Start–Stop System Energy Recovery

Use Scenario: Input rectification and hold-up in 5 V/3.3 V auxiliary supplies powered from vehicle battery.

IC Role / Device Role / Timing Role: Primary rectifier in bridgeless PFC or offline flyback front-end stage.

Use Value: 25 µA I_R at 125°C prevents excessive standby current drain during extended parking periods.

Use Scenario: Regenerative braking energy recapture into 48 V storage in start–stop systems.

IC Role / Device Role / Timing Role: Unidirectional energy transfer rectifier in bidirectional buck–boost converter.

Use Value: TO-277A package with wettable flanks ensures reliable reflow soldering and thermal cycling endurance over 10,000 cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-8EWH08FN-M3	Same TO-277A package, 800 V V_RRM, but 100 ns t_rr and 1.55 V V_F @ 8 A/25°C	Slightly higher conduction loss; suitable where ultra-fast recovery is not critical	Preferred when cost sensitivity outweighs 0.07 V V_F advantage of TUAU8KH
ON Semiconductor MUR880EG	TO-220AC package, 800 V V_RRM, 75 ns t_rr, but no AEC-Q101 qualification or wettable flanks	Requires through-hole assembly and lacks automotive qualification for under-hood use	Acceptable only in non-automotive industrial DC–DC where qualification and SMT are not required

Compared with VS-8EWH08FN-M3 and MUR880EG, the TUAU8KH provides the lowest forward voltage among AEC-Q101-qualified 800 V SMT rectifiers and uniquely combines wettable flanks with 80 ns recovery-enabling both AOI compatibility and reduced switching loss in space-constrained automotive modules.

Availability

TUAU8KH is available at Aetrix Electronics and suitable for automotive DC–DC converters, LED headlamp drivers, and engine control unit power supplies requiring stable component supply, AEC-Q101 compliance, and high-temperature reliability.

Supply support for TUAU8KH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power devices, rectifiers, and protection components.

The TUAU8KH belongs to TSC's AEC-Q101-qualified high-voltage rectifier family, engineered specifically for automotive power conversion where thermal robustness, fast recovery, and process reliability are mandatory.

FAQ

What is the maximum junction temperature rating for the TUAU8KH?

The TUAU8KH has a maximum junction temperature (T_J) of +150°C, with operational range from –55°C to +150°C. This rating is confirmed in the Absolute Maximum Ratings table and applies across all voltage variants in the TUAU8xH series. The +150°C limit reflects its design for under-hood automotive environments where sustained high-temperature operation is required. Thermal derating begins above this threshold, and exceeding it risks permanent parametric shift or failure.

Does the TUAU8KH have AEC-Q101 qualification, and what tests does it cover?

Yes, the TUAU8KH is explicitly AEC-Q101 qualified, as stated in the FEATURES section of the official datasheet. This qualification covers stress tests including temperature cycling, high-temperature operating life (HTOL), unbiased highly accelerated stress test (uHAST), and mechanical shock-all performed per AEC-Q101 Rev D requirements. The qualification applies to the entire TUAU8xH family, including TUAU8KH, and confirms suitability for automotive power electronics.

What is the reverse recovery time (t_rr) of the TUAU8KH, and how is it measured?

The TUAU8KH has a reverse recovery time (t_rr) of 80 ns maximum, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A, per the Electrical Specifications table. This value is specified for the TUAU8KH and TUAU8MH variants only and is distinct from the 50 ns rating of lower-voltage variants (TUAU8DH–TUAU8JH). The measurement methodology follows JEDEC standard test conditions for fast recovery diodes.

Is the TUAU8KH compatible with lead-free reflow soldering processes?

Yes, the TUAU8KH is fully compatible with lead-free reflow soldering. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the device is rated for moisture sensitivity level 1 per J-STD-020-meaning it can be stored indefinitely at ≤30°C/60% RH without baking prior to assembly. The TO-277A package is qualified for peak reflow temperatures up to 260°C, supporting standard Pb-free SAC305 profiles.

What is the marking code printed on the TUAU8KH device body?

The marking code for the TUAU8KH is "AU8K", as shown in the Absolute Maximum Ratings table under "Marking code on the device". This two-character identifier appears adjacent to the date code and factory code on the top surface of the TO-277A package. It distinguishes TUAU8KH from other members of the family (e.g., AU8D for TUAU8DH, AU8M for TUAU8MH) and is used for visual traceability during manufacturing and field service.

TUAU8KH 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:: 1.7 V @ 8 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 80 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 800 V

Capacitance @ Vr, F:: 43pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SMPC4.6U

Operating Temperature - Junction:: -55°C ~ 150°C

TUAU8KH FAQ

1.How can I place an order for TUAU8KH through Aetrix?

Please submit a Request for Quotation (RFQ) for TUAU8KH 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 TUAU8KH reliable?

The price and inventory of TUAU8KH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TUAU8KH is usually 5 days.

3.What payment methods are accepted for TUAU8KH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TUAU8KH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TUAU8KH?

TUAU8KH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TUAU8KH 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 TUAU8KH?

For technical support, including TUAU8KH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TUAU8KH requirements.

6.How does Aetrix verify that TUAU8KH is sourced from the original manufacturer or authorized distributors?

All TUAU8KH 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 TUAU8KH meets industry standards.

7.What is the process for return or replacement of TUAU8KH?

All TUAU8KH units undergo pre-shipment inspection (PSI). If there is an issue with TUAU8KH, 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 TUAU8KH part is unused and in its original packaging.

Return procedure for TUAU8KH:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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