Diodes Incorporated SDT20120GCT

Overview

SDT20120GCT from Diodes Incorporated is a 20A dual common-cathode Trench Schottky rectifier in TO220AB package, rated for 120V reverse voltage, with 0.83V max forward voltage at 10A/25°C and 30µA max reverse leakage at 120V/25°C. It serves as a high-efficiency output rectifier or freewheel diode in isolated DC-DC converters and AC-DC adapters operating under high-temperature conditions.

For engineers reviewing the SDT20120GCT datasheet, SDT20120GCT pinout, SDT20120GCT application, or SDT20120GCT equivalent, key selection criteria include its low VF stability up to +125°C, soft switching behavior critical for EMI reduction in high-frequency power supplies, and thermal resistance of 2°C/W (junction-to-case) enabling compact heatsink designs.

Technical Context

This dual-leg Schottky rectifier integrates two independent 10A-rated anode-cathode junctions sharing a common cathode terminal, optimized using Trench MOS structure to reduce forward conduction loss while maintaining tight IR control across temperature. Its soft recovery minimizes voltage overshoot during turn-off in flyback and forward converter topologies.

The device operates within -55°C to +150°C junction temperature range and exhibits predictable derating: IO drops linearly from 10A at TC = 25°C to ~4.5A at TC = 100°C per leg (Figure 5), with junction capacitance of ~10,000pF at VR = 0V and <100pF at VR = 100V (Figure 4), supporting stable high-frequency rectification.

Key Specifications

Pinout & Package

Package: TO220AB (Generic), molded plastic, UL 94V-0 rated, matte tin-plated copper leadframe, 1.85g weight. Mounting tab is cathode (pin 3), pins 1 and 2 are anodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-20CPH12-M3 and MBR20120CT, SDT20120GCT delivers optimal balance of low VF, ultra-low IR, automotive-grade process control, and TO220AB compatibility-enabling drop-in replacement in legacy adapter designs while meeting modern efficiency and reliability targets.

Availability

SDT20120GCT is available at Aetrix Electronics and suitable for DC-DC converters, AC-DC adapters, and automotive DC-DC modules requiring stable component supply with guaranteed long-term manufacturability and AEC-Q101-aligned process controls.

Supply support for SDT20120GCT 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The SDT20120GCT belongs to Diodes' high-performance Trench Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in automotive, industrial, and computing applications where thermal stability and low conduction loss are critical.

FAQ

Is SDT20120GCT suitable for automotive applications?

Yes. While SDT20120GCT itself is not AEC-Q101 certified, it is manufactured in IATF 16949-certified facilities using automotive-grade process controls and change management. Diodes offers the functionally identical SDT20120GCTFP variant (ITO220AB package) with full AEC-Q101 qualification and PPAP documentation support for automotive programs.

What is the maximum continuous current per leg at 100°C case temperature?

Per Figure 5 in the datasheet, the SDT20120GCT supports approximately 4.5A average rectified current per leg at TC = 100°C. This derating ensures junction temperature remains below 150°C with RθJC = 2°C/W and typical power dissipation of ~3.6W per leg at that current level.

Can SDT20120GCT replace a single 20A discrete Schottky diode?

No-it is a dual 10A common-cathode device, not a single 20A diode. It replaces two separate 10A Schottkys sharing one cathode connection. Using it as a single-anode device would leave one anode unconnected and waste half the die; proper implementation requires two independent input paths (e.g., center-tapped transformer or dual-phase output).

Does the TO220AB package require insulating hardware when mounted to a heatsink?

Yes. The metal tab (Pin 3, common cathode) is electrically active and must be insulated from the heatsink unless the heatsink is biased to the same potential as the output rail. Standard mica washers or silicone thermal pads with ≥2.5kV dielectric strength are recommended to prevent short circuits and ensure safety compliance.