Taiwan Semiconductor Corporation TUAS4MH

Overview

TUAS4MH from Taiwan Semiconductor is a 4A, 1000V repetitive peak reverse voltage (V_RRM) standard surface-mount rectifier in TO-277A (SMPC4.6U) package, featuring glass passivated junction, AEC-Q101 qualification, and wettable flank terminals - used as primary output rectifier in automotive DC-DC converters and snubber circuits.

For engineers reviewing the TUAS4MH datasheet, TUAS4MH pinout, TUAS4MH application, or TUAS4MH equivalent, key selection criteria include its 1000V V_RRM, 120A I_FSM surge rating, 0.95V forward voltage at 4A/25°C, -55°C to +150°C operating junction temperature, and AEC-Q101 qualification for under-hood automotive use.

Technical Context

This single-die standard rectifier uses planar epitaxial construction with glass passivation for stable reverse leakage and high reliability under thermal cycling. Its TO-277A package provides low R_θJL = 5.2°C/W and wettable flanks for automated optical inspection of solder joints.

The device operates across -55°C to +150°C junction temperature range with 5µA max reverse current at 25°C and 10µA at 125°C under rated V_R, and exhibits 28pF junction capacitance at 1MHz/4V - optimized for high-frequency switching and snubbing in automotive power supplies.

Key Specifications

Pinout & Package

TO-277A (SMPC4.6U) surface-mount package with cathode-indicating band; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance; weight ≈ 0.107g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-4EWH10 and MUR4100CT, TUAS4MH uniquely combines AEC-Q101 qualification, wettable flanks, and 0.95V V_F in TO-277A - making it the only drop-in solution for automotive SMT rectification where reliability, manufacturability, and thermal efficiency are jointly constrained.

Availability

TUAS4MH is available at Aetrix Electronics and suitable for automotive DC-DC converters, LED headlamp drivers, and industrial snubber networks requiring stable component supply, traceable sourcing, and lifecycle continuity.

Supply support for TUAS4MH 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 automotive, industrial, and consumer markets since 1979.

The TUAS4MH belongs to TSC's AEC-Q101-qualified standard rectifier product line, engineered specifically for high-reliability surface-mount rectification in automotive power systems where thermal robustness, process compatibility, and transient resilience are mandatory.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for TUAS4MH?

The TUAS4MH has a V_RRM of 1000 V, verified per Taiwan Semiconductor's A2111 datasheet revision. This rating defines the maximum allowable reverse voltage the device can block repeatedly without breakdown. It ensures safe operation in 48V automotive systems subjected to load dump transients and in industrial DC link applications where voltage overshoot may exceed 800V. The TUAS4MH maintains this rating across its full operating temperature range.

Is TUAS4MH qualified for automotive applications?

Yes, TUAS4MH is AEC-Q101 qualified per the official Taiwan Semiconductor documentation. This qualification includes testing for high-temperature reverse bias (HTRB), temperature cycling (TC), and unbiased highly accelerated stress test (UHAST). The TUAS4MH is intended for under-hood automotive use, including DC-DC converters and LED lighting drivers. Its TO-277A package with wettable flanks further supports automotive manufacturing requirements.

What is the forward voltage (V_F) of TUAS4MH at 4A and 25°C?

The TUAS4MH exhibits a maximum forward voltage of 0.95 V at 4A and 25°C, as specified in the electrical characteristics table of the A2111 datasheet. At 125°C, V_F drops to 0.85 V max due to semiconductor physics. This low V_F directly reduces conduction losses - for example, yielding ≤3.8W dissipation at full rated current - which is critical for thermal management in sealed automotive modules.

Does TUAS4MH have wettable flank terminals?

Yes, TUAS4MH features wettable flank terminals as explicitly stated in the "FEATURES" section of the Taiwan Semiconductor datasheet. These flanks extend vertically down the side of the TO-277A (SMPC4.6U) package and are plated with matte tin to enable automated optical inspection (AOI) of solder fillets after reflow. This feature improves process yield and field reliability in automotive SMT lines where solder joint integrity is mission-critical.

What is the junction-to-lead thermal resistance (R_θJL) of TUAS4MH?

The TUAS4MH has a typical junction-to-lead thermal resistance (R_θJL) of 5.2°C/W, measured per JEDEC standards on a 16mm × 16mm copper pad test board. This low value indicates efficient heat transfer from the die to the PCB via the lead frame. Engineers can use this parameter to model thermal performance without external heatsinks - for instance, estimating a 20.8°C rise above ambient at 4A conduction (3.8W × 5.2°C/W), confirming suitability for convection-cooled automotive modules.