Diodes Incorporated G20H120CTW

Overview

G20H120CTW from Diodes Incorporated is a Trench Schottky rectifier rated for 120 V reverse voltage and 20 A average forward current at Tc = 145°C, optimized for high-frequency DC-DC converters and switch-mode power adapters. It features low forward voltage (0.64 V typ. @ 10 A, 25°C), negligible switching losses, and AEC-Q101 Rev_D qualification for automotive-grade reliability.

For engineers reviewing the G20H120CTW datasheet, G20H120CTW pinout, G20H120CTW application, or G20H120CTW equivalent, this device is selected for high-efficiency, thermally demanding rectification where low VF, low leakage trade-off, and TO-220AB-mountable thermal resistance (RthJC = 2°C/W) are critical in compact power stages.

Technical Context

This Schottky rectifier uses trench MOS structure to achieve superior forward voltage vs. leakage current balance versus planar Schottkys. Its 730 pF junction capacitance at 4 V reverse bias supports operation up to several MHz in resonant and synchronous rectifier topologies.

The device operates across –55°C to +175°C junction temperature range and delivers 280 A non-repetitive surge current (8.3 ms half-sine). Thermal resistance is characterized with fin-type heatsink (40 mm × 23 mm × 15.8 mm), enabling stable 20 A conduction under controlled case temperature conditions.

Key Specifications

Pinout & Package

Package: JEDEC TO-220AB, single-ended through-hole, isolated tab (pin 2), lead-free and halogen-free "Green" molding compound (UL 94V-0).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS20H120CG and VS-20CPH12, G20H120CTW offers the lowest VF, best thermal resistance, and automotive qualification in a TO-220AB package-making it optimal for space-constrained, thermally aggressive, and automotive-compliant designs.

Availability

G20H120CTW is available at Aetrix Electronics and suitable for on-board DC-DC converters, high-frequency switch-mode adapters, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for G20H120CTW 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, specializing in high-efficiency power management and signal integrity solutions for automotive, industrial, and consumer markets.

G20H120CTW belongs to Diodes' Trench Schottky Rectifier product line, engineered for high-frequency, high-reliability power conversion where low VF, low leakage, and AEC-Q101 compliance are mandatory in automotive and industrial power supplies.

FAQ

Is G20H120CTW suitable for synchronous rectification?

No-G20H120CTW is an uncontrolled Schottky rectifier, not a synchronous rectifier IC or MOSFET driver. It functions as a passive diode with inherent unidirectional conduction. For synchronous rectification, a gate-controlled MOSFET and dedicated driver IC are required. This part replaces MOSFETs only in cost-optimized, lower-efficiency designs where its low VF suffices.

What is the maximum allowable case temperature for continuous 20 A operation?

The datasheet specifies I(AV) = 20 A at Tc = 145°C. Exceeding this case temperature risks thermal runaway due to rising IR and reduced thermal margin. Derating curves show usable current drops to ~15 A at Tc = 160°C and ~10 A at Tc = 175°C. Proper heatsinking maintaining Tc ≤145°C is mandatory for rated current.

Does the TO-220AB package provide electrical isolation between the tab and pins?

Yes-the TO-220AB variant used in G20H120CTW features an electrically isolated metal tab (Pin 2, cathode), confirmed by Diodes' mechanical drawings and packaging specification. This allows direct mounting to grounded heatsinks without additional insulation, unlike TO-220AC which has a conductive tab tied to Pin 2.

How does the 730 pF junction capacitance affect EMI in high-frequency designs?

At 1 MHz and 4 V reverse bias, 730 pF contributes measurable displacement current during fast dV/dt transitions. In >300 kHz topologies, this capacitance can increase high-frequency common-mode noise and require tighter snubber design. However, it remains significantly lower than PN-junction rectifiers (>2 nF), making it suitable for most SMPS applications below 1 MHz without added filtering.