Taiwan Semiconductor Corporation US1A M2G

Overview

US1A M2G from Taiwan Semiconductor is a 1 A, 50 V ultrafast surface-mount rectifier diode in DO-214AC (SMA) package, featuring 1.0 V max forward voltage at 1 A, 50 ns reverse recovery time, and 30 A peak surge current - deployed in DC-DC converters and snubber circuits for high-efficiency power conversion.

For engineers reviewing the US1A M2G datasheet, US1A M2G pinout, US1A M2G application, or US1A M2G equivalent, key selection criteria include repetitive peak reverse voltage (50 V), thermal resistance (R_θJL = 27 °C/W), junction temperature range (–55 to +150 °C), and RoHS/halogen-free compliance for industrial and lighting power designs.

Technical Context

This single-die, glass-passivated silicon rectifier supports ultrafast switching with low stored charge and minimal reverse recovery loss. Its DO-214AC (SMA) package enables automated placement and meets J-STD-020 moisture sensitivity level 1 and JESD 201 Class 2 whisker resistance.

The device operates across –55 °C to +150 °C junction temperature, with 75 °C/W junction-to-ambient thermal resistance and 27 °C/W junction-to-lead thermal resistance - enabling reliable conduction in compact, thermally constrained layouts without forced cooling.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, cathode-indicated by band, matte tin-plated leads, UL 94V-0 molding compound, 0.060 g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH1R06U and MBR150, the US1A M2G offers optimal balance of cost, 150 °C junction rating, and robustness in industrial ambient conditions - making it preferred for general-purpose 50 V ultrafast rectification where thermal headroom and reliability outweigh marginal speed or VF gains.

Availability

US1A M2G is available at Aetrix Electronics and suitable for DC-DC converters, snubber networks, freewheeling paths, and LED driver flyback circuits requiring stable component supply, long-lifecycle assurance, and full traceability.

Supply support for US1A M2G 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 industrial, computing, and consumer markets since 1979.

The US1A M2G belongs to TSC's US1x ultrafast rectifier family, engineered specifically for high-efficiency, high-reliability power conversion in space-constrained surface-mount applications - emphasizing thermal robustness, automated assembly compatibility, and environmental compliance.

FAQ

What is the maximum junction temperature rating for US1A M2G?

The US1A M2G has a maximum junction temperature (T_J) of +150 °C and a minimum of –55 °C. This wide operating range allows deployment in industrial environments with elevated ambient temperatures or in sealed enclosures without active cooling. The rated 1 A forward current assumes proper PCB copper area for thermal dissipation, and derating begins above 75 °C ambient per the forward current derating curve in the datasheet. US1A M2G maintains stable electrical performance across this full range when mounted per recommended pad layout.

Is US1A M2G RoHS and halogen-free compliant?

Yes, US1A M2G is fully RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and lead content is below 1000 ppm. This compliance is verified per TSC's material declarations and supports regulatory acceptance in EU, China, and Korea markets. US1A M2G is suitable for consumer lighting, industrial controls, and automotive-adjacent power supplies where substance restrictions apply.

What does the "M2G" suffix indicate in US1A M2G?

The "M2G" suffix in US1A M2G denotes Taiwan Semiconductor's standard tape-and-reel packaging: M2 = 7,500 units per reel, G = green compound (halogen-free molding). It is not a performance variant - all electrical and thermal specifications match the base US1A part. US1A M2G shares identical VRRM (50 V), trr (50 ns), VF (≤1.0 V), and DO-214AC mechanical dimensions with other US1A variants labeled differently (e.g., US1A-T, US1A-TP).

Can US1A M2G replace a 1N4001 in a linear power supply?

No - US1A M2G is an ultrafast rectifier optimized for switching-mode applications (trr = 50 ns), while the 1N4001 is a general-purpose rectifier with trr > 30 µs. In linear supplies operating at 50/60 Hz, US1A M2G offers no benefit and costs more. Its lower IFSM (30 A vs. 50 A for 1N4001) and tighter thermal limits make it less suitable for transformer inrush. US1A M2G is intended for high-frequency DC-DC converters, not line-frequency rectification. Use US1A M2G only where fast recovery is required.

What is the reverse leakage current specification for US1A M2G at 125 °C?

At T_J = 125 °C and rated V_RRM = 50 V, the US1A M2G exhibits a maximum reverse leakage current (I_R) of 150 µA, per the electrical specifications table. This value is measured under pulse conditions (PW = 30 ms) and reflects worst-case thermal stress. At 25 °C, leakage is ≤5 µA. Designers should verify that this leakage remains within acceptable limits for high-impedance bias networks or precision reference circuits - especially in thermally unmanaged layouts where junction temperature may approach 125 °C.