Taiwan Semiconductor Corporation SRS1620

Overview

SRS1620 from Taiwan Semiconductor is a 16A, 20V repetitive peak reverse voltage Schottky barrier rectifier in TO-263AB (D2PAK) package, featuring 0.55V forward voltage at 8A/25°C, 150A surge capability, and junction-to-case thermal resistance of 2°C/W - deployed in high-efficiency SMPS secondary-side rectification.

For engineers reviewing the SRS1620 datasheet, SRS1620 pinout, SRS1620 application, or SRS1620 equivalent, key selection criteria include low VF for reduced conduction loss, dual-die configuration for parallel current handling, TO-263AB thermal performance, and JESD201 Class 2 whisker resistance in industrial power converters.

Technical Context

The SRS1620 implements a dual-die Schottky barrier structure optimized for low forward voltage drop and fast recovery, with no PN junction switching delay. Its 20V VRRM rating targets low-voltage DC-DC output stages where conduction efficiency dominates over reverse blocking margin.

Thermal design centers on the TO-263AB package's 2°C/W R_θJC, enabling direct heatsink mounting via the exposed cathode tab. The device operates up to 125°C junction temperature under continuous 16A DC load with appropriate PCB copper area.

Key Specifications

Pinout & Package

TO-263AB (D2PAK) package with exposed cathode tab (pin 2), anode terminal (pin 1), and isolated thermal pad (pin 3). Cathode marking indicated by band on top surface; polarity must align with PCB silkscreen.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-16CTQ020P and SB1620, the SRS1620 delivers optimal balance of VF (0.55V), thermal resistance (2°C/W), and 125°C-rated operation - making it ideal for space-constrained, thermally managed 20V-output power supplies where reliability and efficiency are co-prioritized.

Availability

SRS1620 is available at Aetrix Electronics and suitable for switching mode power supplies, laptop adapters, and industrial DC-DC converters requiring stable component supply, consistent parametric performance, and RoHS-compliant manufacturing.

Supply support for SRS1620 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 power semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and consumer markets since 1979.

The SRS1620 belongs to TSC's high-current Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability secondary-side rectification in compact, thermally demanding power conversion systems.

FAQ

What is the maximum continuous forward current rating for the SRS1620?

The SRS1620 is rated for 16 A continuous forward current (IF) at case temperature TC = 110°C. This rating assumes adequate PCB copper area or heatsinking to maintain the specified thermal boundary condition. At higher case temperatures, derating applies per the forward current derating curve in the datasheet. The SRS1620 must not exceed 16 A DC under sustained operation without thermal compromise.

Does the SRS1620 have a built-in guard ring, and what function does it serve?

Yes, the SRS1620 incorporates a guard ring structure explicitly noted in its features. This design element mitigates edge breakdown under high dv/dt or transient overvoltage conditions, enhancing ruggedness in unregulated or noisy input environments. The guard ring improves long-term reliability of the SRS1620 in applications such as industrial SMPS where line surges or inductive kickback may occur.

What is the thermal resistance from junction to case (R_θJC) for the SRS1620, and how is it measured?

The SRS1620 has a typical junction-to-case thermal resistance (R_θJC) of 2°C/W, measured from the silicon die to the exposed cathode tab under standardized test conditions. This value is critical for calculating junction temperature rise above case temperature and confirms the SRS1620's suitability for direct heatsink mounting. The low R_θJC enables effective thermal management in high-power-density layouts.

Is the SRS1620 compatible with lead-free reflow soldering processes?

Yes, the SRS1620 uses matte tin-plated leads compliant with J-STD-002 for solderability and is rated for lead-free reflow profiles. Its moisture sensitivity level is J-STD-020 Level 1, meaning it can be stored indefinitely in dry packaging and placed directly into reflow without baking. This ensures robust manufacturability for the SRS1620 in modern SMT lines.

How does the forward voltage (VF) of the SRS1620 compare across temperature and current conditions?

The SRS1620 exhibits a typical VF of 0.55 V at 8 A and 25°C, rising to approximately 0.45 V at 100°C due to negative temperature coefficient of Schottky diodes. At 16 A, VF increases to ~0.62 V at 25°C. These values are confirmed in the electrical specifications table and forward characteristics curve - critical for accurate loss modeling in the SRS1620's target applications.