Taiwan Semiconductor Corporation SRT12

Overview

SRT12 from Taiwan Semiconductor is a 1 A, 20 V repetitive peak reverse voltage Schottky barrier rectifier in TS-1 package, featuring low forward voltage drop (0.55 V at 1 A, 25°C), high surge current capability (25 A, 8.3 ms), and AEC-Q101 qualification option (SRT12H). It serves as a primary output rectifier in compact DC-DC converters.

For engineers reviewing the SRT12 datasheet, SRT12 pinout, SRT12 application, or SRT12 equivalent, key selection criteria include its 20 V V_RRM, 0.55 V V_F at rated current, 110 pF junction capacitance, TS-1 thermal resistance of 50 °C/W, and cathode-band polarity marking for unambiguous PCB layout.

Technical Context

The SRT12 employs a single-die Schottky structure optimized for low-loss switching in low-voltage DC-DC conversion stages. Its 20 V V_RRM rating targets secondary-side rectification in buck-derived topologies where voltage margin and fast recovery are critical.

Thermal performance is defined by R_θJA = 50 °C/W in standard mounting, with maximum junction temperature rated at 125°C (derated above 25°C ambient). Reverse leakage remains ≤500 µA at 25°C and ≤10 mA at 100°C, supporting stable operation in thermally constrained adapters.

Key Specifications

Pinout & Package

TS-1 package: surface-mount, single-anode/single-cathode configuration with cathode band marking; lead-free, RoHS-compliant pure tin plating; UL 94V-0 molding compound; 0.200 g typical weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-1EQH02-M3/5BT and SB120, the SRT12 delivers superior thermal density (50 °C/W) in a compact TS-1 SMT package while maintaining competitive forward voltage-making it optimal for high-power-density, automated production environments.

Availability

SRT12 is available at Aetrix Electronics and suitable for USB-C PD adapters, industrial IoT sensor nodes, automotive body control modules, and medical portable diagnostic chargers requiring stable component supply across multi-year production cycles.

Supply support for SRT12 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 automotive markets since 1979.

The SRT12 belongs to TSC's Schottky Rectifier family designed specifically for high-efficiency, low-voltage DC-DC conversion in space-constrained and thermally demanding applications.

FAQ

What is the maximum junction temperature rating for the SRT12?

The SRT12 has a maximum junction temperature (T_J(max)) of +125°C under continuous operation. This rating applies across its full current range and is validated per JEDEC standards. Derating begins above 25°C ambient, with forward current reduced linearly to zero at 125°C case temperature. The SRT12 datasheet specifies this limit in the Absolute Maximum Ratings table on page 1.

Does the SRT12 have AEC-Q101 qualification?

The base SRT12 is not AEC-Q101 qualified; however, the SRT12H variant is explicitly qualified per AEC-Q101 Rev D. The "H" suffix denotes automotive-grade screening including temperature cycling, highly accelerated stress testing, and failure analysis. For automotive applications requiring qualification, SRT12H-not SRT12-must be specified and sourced.

What is the reverse leakage current specification for the SRT12 at 100°C?

At 100°C junction temperature and rated reverse voltage (20 V), the SRT12 exhibits a maximum reverse leakage current (I_R) of 10 mA. This value is confirmed in the Electrical Specifications table on page 2 of the official datasheet (Version I2104), under the "Reverse current @ rated V_R" row for SRT12–SRT14 groupings.

How does the TS-1 package of the SRT12 compare thermally to DO-214AC?

The TS-1 package provides R_θJA = 50 °C/W, significantly better than typical DO-214AC packages (≈70 °C/W). This 20 °C/W improvement results from optimized thermal pad design and shorter internal thermal path. In practice, the SRT12 achieves ~15°C lower junction temperature than DO-214AC equivalents at 1 A continuous load on identical 1-in² copper area.

Is the SRT12 suitable for use in medical portable diagnostic equipment?

Yes-the SRT12 is halogen-free per IEC 61249-2-21 and RoHS compliant, meeting material restrictions for portable medical devices. While not designed for life-sustaining applications per TSC's notice, it is widely deployed in battery-powered diagnostic chargers and handheld imaging units where low EMI and thermal efficiency are critical. Always validate final system compliance per IEC 60601-1.