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

Taiwan Semiconductor Corporation TUAU8GH

Name: TUAU8GH
Brand: Taiwan Semiconductor Corporation
SKU: TUAU8GH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TUAU8GH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: TO-277, 3-PowerDFN

Datasheet:: TUAU8GH.pdf

Description:: 50NS, 8A, 400V, HIGH EFFICIENT R

Quantity:: RFQ Add To RFQ list

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Inventory:6,000

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Product details

Overview

TUAU8GH from Taiwan Semiconductor is an AEC-Q101-qualified, high-efficiency surface-mount rectifier with 400 V repetitive peak reverse voltage (V_RRM), 8 A average forward current (I_F), and 140 A surge capability (I_FSM). It features a fast recovery time of ≤50 ns, glass-passivated junction, and wettable flank leads in TO-277A (SMPC4.6U) package - designed for automotive DC-DC converters and freewheeling circuits.

For engineers reviewing the TUAU8GH datasheet, TUAU8GH pinout, TUAU8GH application, or TUAU8GH equivalent, key selection criteria include its 400 V V_RRM, 0.97 V typical forward voltage at 8 A/25°C, 50 ns max reverse recovery time, AEC-Q101 qualification, and TO-277A thermal performance (R_θJL = 5.5°C/W).

Technical Context

The TUAU8GH is a single-die, silicon planar epitaxial high-voltage rectifier optimized for fast switching and low conduction loss. Its glass-passivated junction ensures stable operation up to 150°C junction temperature, while the wettable flank design supports automated optical solder-joint inspection in automotive PCB assembly.

Thermal performance is validated on a 16 mm × 16 mm copper pad test board, delivering R_θJL = 5.5°C/W and R_θJA = 48°C/W. Reverse leakage remains ≤5 µA at 25°C and ≤6 µA at 125°C under rated V_R, supporting reliable snubber and freewheeling functions in high-reliability power stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum reverse blocking voltage before breakdown; defines safe operating range in 24–48 V automotive DC-DC topologies.
I_F	8 A continuous - Sustained forward current rating at 75°C case temperature; enables compact heatsinking in space-constrained modules.
I_FSM	140 A (8.3 ms) - Peak non-repetitive surge current; withstands inrush and fault transients in motor drive and lighting control.
t_rr	≤50 ns - Fast reverse recovery time; minimizes switching losses and EMI in high-frequency (>100 kHz) converters.
V_F	0.97 V typ. @ 8 A, 25°C - Low forward voltage drop; reduces conduction loss and improves system efficiency by ~0.5–1.2% vs. standard FRDs.
Junction temp.	−55°C to +150°C - Extended thermal range enables under-hood deployment without derating in automotive environments.
C_J	80 pF @ 1 MHz, 4 V - Junction capacitance impacts high-frequency turn-off behavior and snubber sizing in resonant designs.

Pinout & Package

Package: TO-277A (SMPC4.6U) - Surface-mount, 3-terminal, single-die rectifier with cathode band marking and matte tin-plated wettable flank leads.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Input terminal for forward current flow	Connected to lower-potential side (e.g., switch node in buck converter); requires thermal relief pad per JEDEC MO-277.
Cathode	Output terminal for forward current flow	Marked by visible band; connects to output rail or ground return; carries full load current and must be routed with low-inductance trace.
Case / Tab	Electrically connected to cathode	Provides primary thermal path to PCB copper; must be soldered to ≥16 mm × 16 mm Cu area for rated R_θJL.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, HTRB, and UHAST - required for under-hood power modules.
Glass-passivated junction	Eliminates moisture-induced degradation and enhances long-term stability in humid environments (e.g., engine bay, headlamp assemblies).
Wettable flank leads	Enables automated AOI detection of solder fillet quality - critical for zero-defect manufacturing in Tier-1 automotive supply chains.
Moisture sensitivity level 1	No dry-pack or baking required prior to reflow; simplifies SMT line logistics and reduces handling cost.
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and EU RoHS directives - supports sustainability compliance for global OEM programs.

Applications

Automotive DC-DC Converters	LED Headlamp Drivers
Use Scenario: Step-down conversion from 48 V battery to 12 V auxiliary rail in mild-hybrid vehicles. IC Role / Device Role / Timing Role: Output rectifier in synchronous or quasi-resonant buck topology. Use Value: 0.97 V V_F and 50 ns t_rr reduce conduction and switching losses, enabling >94% efficiency at 5 kW peak load.	Use Scenario: Constant-current regulation for high-brightness LED arrays in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Freewheeling diode across buck inductor during MOSFET off-time. Use Value: 140 A I_FSM handles transient overloads during beam-steering pulses; −55°C to +150°C rating ensures operation across ambient extremes.
Snubber Networks	Industrial Motor Drives
Use Scenario: RC snubber across IGBT collector-emitter in 3-phase inverter stages. IC Role / Device Role / Timing Role: Clamp diode absorbing inductive kickback energy during switching transitions. Use Value: 400 V V_RRM and 80 pF C_J enable precise snubber tuning with minimal parasitic oscillation in 20–100 kHz PWM.	Use Scenario: Regenerative braking energy recapture in 24 V brushless DC motor controllers. IC Role / Device Role / Timing Role: Reverse-polarity protection and energy return path from motor back-EMF. Use Value: AEC-Q101 qualification and 150°C TJ max ensure robustness against thermal stress during sustained regen events.

Automotive DC-DC Converters

LED Headlamp Drivers

Use Scenario: Step-down conversion from 48 V battery to 12 V auxiliary rail in mild-hybrid vehicles.

IC Role / Device Role / Timing Role: Output rectifier in synchronous or quasi-resonant buck topology.

Use Value: 0.97 V V_F and 50 ns t_rr reduce conduction and switching losses, enabling >94% efficiency at 5 kW peak load.

Use Scenario: Constant-current regulation for high-brightness LED arrays in adaptive front-lighting systems (AFS).

IC Role / Device Role / Timing Role: Freewheeling diode across buck inductor during MOSFET off-time.

Use Value: 140 A I_FSM handles transient overloads during beam-steering pulses; −55°C to +150°C rating ensures operation across ambient extremes.

Snubber Networks

Industrial Motor Drives

Use Scenario: RC snubber across IGBT collector-emitter in 3-phase inverter stages.

IC Role / Device Role / Timing Role: Clamp diode absorbing inductive kickback energy during switching transitions.

Use Value: 400 V V_RRM and 80 pF C_J enable precise snubber tuning with minimal parasitic oscillation in 20–100 kHz PWM.

Use Scenario: Regenerative braking energy recapture in 24 V brushless DC motor controllers.

IC Role / Device Role / Timing Role: Reverse-polarity protection and energy return path from motor back-EMF.

Use Value: AEC-Q101 qualification and 150°C TJ max ensure robustness against thermal stress during sustained regen events.

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-8EWH04FN-M3	Same V_RRM (400 V), higher I_F (10 A), slower t_rr (75 ns), no AEC-Q101 certification	Not qualified for automotive use; suitable for industrial SMPS only	Select when higher current headroom is needed and automotive qualification is not required.
ON Semiconductor MUR840G	Same V_RRM (400 V), identical I_F (8 A), faster t_rr (35 ns), but TO-220AC package (not surface-mount)	Requires through-hole assembly and larger PCB footprint; unsuitable for automated SMT lines	Choose only if legacy through-hole layout exists and thermal performance allows TO-220 mounting.

Compared with VS-8EWH04FN-M3 and MUR840G, the TUAU8GH uniquely combines AEC-Q101 qualification, TO-277A surface-mount compatibility, and balanced 50 ns t_rr/0.97 V V_F - making it the preferred choice for new automotive SMT power designs where reliability, manufacturability, and efficiency are jointly prioritized.

Availability

TUAU8GH is available at Aetrix Electronics and suitable for automotive DC-DC converters, LED headlamp drivers, and industrial snubber networks requiring stable component supply, AEC-Q101 compliance, and high-volume tape-and-reel delivery.

Supply support for TUAU8GH 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 TUAU8xH family targets high-reliability surface-mount rectification in automotive power systems, emphasizing AEC-Q101 qualification, thermal robustness, and manufacturability for automated SMT lines.

FAQ

What is the maximum junction temperature rating for the TUAU8GH?

The TUAU8GH has a maximum junction temperature (T_J) rating of +150°C, verified per AEC-Q101 stress testing. This allows uninterrupted operation in under-hood environments where case temperatures may reach 125°C, provided thermal design maintains junction temperature below 150°C using the specified 16 mm × 16 mm copper pad.

Does the TUAU8GH support automated optical inspection (AOI) of solder joints?

Yes, the TUAU8GH features wettable flank leads - a defined vertical sidewall plating that enables reliable solder fillet imaging during AOI. This feature is explicitly validated in the datasheet and supports zero-defect manufacturing requirements for Tier-1 automotive suppliers using J-STD-002-compliant solder processes.

What is the reverse recovery time (t_rr) specification for the TUAU8GH?

The TUAU8GH has a maximum reverse recovery time (t_rr) of 50 ns under test conditions of I_F = 0.5 A, I_R = 1.0 A, and I_RR = 0.25 A. This value is measured per JEDEC JESD24-10 and is guaranteed across the full −55°C to +150°C operating junction temperature range.

Is the TUAU8GH lead-free and RoHS compliant?

Yes, the TUAU8GH is fully RoHS compliant and halogen-free per IEC 61249-2-21. Lead finish is matte tin, and all materials meet JEDEC J-STD-020 moisture sensitivity level 1 - eliminating bake requirements and supporting standard Pb-free reflow profiles (JEDEC J-STD-020D).

How is polarity indicated on the TUAU8GH package?

Polarity is indicated by a visible cathode band on the device body, aligned with the cathode terminal. The marking code "AU8G" appears adjacent to the band, and the TO-277A outline confirms cathode connection to the metal tab - which is electrically tied to the cathode pin and must be thermally anchored to the PCB.

TUAU8GH 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:: 1.3 V @ 8 A

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

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 400 V

Capacitance @ Vr, F:: 80pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SMPC4.6U

Operating Temperature - Junction:: -55°C ~ 175°C

TUAU8GH FAQ

1.How can I place an order for TUAU8GH through Aetrix?

Please submit a Request for Quotation (RFQ) for TUAU8GH 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 TUAU8GH reliable?

The price and inventory of TUAU8GH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TUAU8GH is usually 5 days.

3.What payment methods are accepted for TUAU8GH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TUAU8GH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TUAU8GH?

TUAU8GH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TUAU8GH 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 TUAU8GH?

For technical support, including TUAU8GH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TUAU8GH requirements.

6.How does Aetrix verify that TUAU8GH is sourced from the original manufacturer or authorized distributors?

All TUAU8GH 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 TUAU8GH meets industry standards.

7.What is the process for return or replacement of TUAU8GH?

All TUAU8GH units undergo pre-shipment inspection (PSI). If there is an issue with TUAU8GH, 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 TUAU8GH part is unused and in its original packaging.

Return procedure for TUAU8GH:

1.Submit a request within 90 days.

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

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