Taiwan Semiconductor Corporation TUAU8MH

Overview

TUAU8MH from Taiwan Semiconductor is a high-efficiency, surface-mount ultrafast rectifier rated for 1000 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, AEC-Q101 qualification, and is optimized for automotive freewheeling and snubber circuits where high-voltage clamping and fast recovery are critical.

For engineers reviewing the TUAU8MH datasheet, TUAU8MH pinout, TUAU8MH application, or TUAU8MH equivalent, key selection criteria include its 1000 V V_RRM, 1.48 V typical forward voltage at 8 A/25°C, 80 ns maximum reverse recovery time (t_rr), junction temperature range up to +175°C, and compliance with JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.

Technical Context

The TUAU8MH employs a single-die, glass-passivated silicon junction with ultrafast recovery characteristics tailored for high-frequency switching environments. Its 1000 V V_RRM rating supports operation in 400–800 V DC bus systems with safety margin, while the 80 ns t_rr minimizes switching losses in hard-switched topologies.

Thermally, it delivers R_θJL = 5.5°C/W and R_θJA = 48°C/W on a 16 mm × 16 mm Cu pad PCB, enabling reliable 8 A continuous conduction at ambient temperatures up to +85°C. The device's 25 µA max reverse leakage at 125°C and 43 pF junction capacitance further support stable performance in high-noise automotive power stages.

Key Specifications

Pinout & Package

Package: TO-277A (SMPC4.6U), surface-mount, single-anode/single-cathode configuration with cathode band marking. Wettable flank terminals enable automated optical solder-joint inspection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast rectifier applications.

Compared with STTH8R06DJF and MUR8100CT, the TUAU8MH uniquely combines 1000 V rating, AEC-Q101 qualification, surface-mount wettable flanks, and 80 ns t_rr-making it the only option qualified for next-generation automotive 48 V/800 V architectures requiring zero rework risk and automated optical inspection.

Availability

TUAU8MH is available at Aetrix Electronics and suitable for automotive DC-DC converters, LED headlamp drivers, and industrial snubber networks requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant sourcing.

Supply support for TUAU8MH 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 foundry and discrete device manufacturer headquartered in Hsinchu, Taiwan, specializing in power semiconductors and analog ICs since 1979.

The TUAU8MH belongs to TSC's A2111-series ultrafast rectifier family, engineered specifically for high-reliability automotive power conversion where voltage margin, thermal robustness, and automated manufacturability are non-negotiable.

FAQ

What is the maximum junction temperature rating for TUAU8MH?

The TUAU8MH has a maximum junction temperature (T_J) rating of +175°C, validated per AEC-Q101 stress tests. This allows operation in high-ambient under-hood environments when used within its derated forward current envelope. Thermal design must maintain T_J ≤ 175°C using the published R_θJL = 5.5°C/W and R_θJA = 48°C/W values. The TUAU8MH data sheet specifies this limit applies to all variants in the TUAU8xH series with "H" suffix.

Does TUAU8MH have wettable flank leads for automated optical inspection?

Yes, the TUAU8MH features wettable flank leads as confirmed in the mechanical data section of the official TSC datasheet (Version A2111). This design enables reliable solder-joint quality verification via standard AOI systems without requiring X-ray inspection. The wettable flank geometry is standardized across the TO-277A (SMPC4.6U) package used for the entire TUAU8xH family, including TUAU8MH.

What is the reverse recovery time (t_rr) specification for TUAU8MH?

The TUAU8MH has a maximum reverse recovery time (t_rr) of 80 ns under test conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This value is explicitly listed in the Electrical Specifications table for both TUAU8KH and TUAU8MH variants. The 80 ns t_rr supports efficient operation in switching power supplies operating up to 500 kHz while minimizing reverse recovery loss and associated EMI.

Is TUAU8MH qualified to AEC-Q101 standards?

Yes, the TUAU8MH is explicitly AEC-Q101 qualified as stated in the FEATURES section of the official TSC datasheet. This qualification covers temperature cycling, high-temperature reverse bias (HTRB), and other stress tests required for discrete semiconductors in automotive applications. The AEC-Q101 status applies to the full TUAU8xH series, including TUAU8MH, and is documented in TSC's certification records referenced in Version A2111.

What is the marking code printed on the TUAU8MH device body?

The TUAU8MH is marked with "AU8M" on its surface, as specified in the Absolute Maximum Ratings table of the TSC datasheet. This 4-character code distinguishes it from lower-voltage variants: AU8D (200 V), AU8G (400 V), AU8J (600 V), and AU8K (800 V). The "AU8M" marking is laser-etched on the cathode-side surface and aligns with the polarity band indicating the cathode terminal.