Diodes Incorporated G30H120CTW

Overview

G30H120CTW from Diodes Incorporated is a trench Schottky rectifier rated for 120 V reverse voltage and 30 A average forward current at Tc = 110°C, featuring low forward voltage (0.66 V typ @ 15 A, 25°C), negligible switching losses, and AEC-Q101 Rev_D qualification for automotive-grade reliability in high-frequency DC-DC converters.

For engineers reviewing the G30H120CTW datasheet, G30H120CTW pinout, G30H120CTW application, or G30H120CTW equivalent, key selection criteria include thermal resistance (RthJC = 3°C/W), junction temperature range (–55°C to +175°C), leakage current (5 mA max @ 125°C), TO-220AB mechanical compatibility, and green/halogen-free compliance for industrial power supply design.

Technical Context

This device employs a trench Schottky architecture to minimize forward voltage drop while maintaining controlled reverse leakage-achieving 0.66 V typ at 15 A/25°C and 0.84 V max at 15 A/125°C. Its 980 pF junction capacitance (measured at 1 MHz, 4 V reverse bias) supports high-frequency operation up to several hundred kHz.

The diode is optimized for unidirectional conduction in hard-switched topologies, with a peak surge current rating of 280 A (8.3 ms half-sine) and thermal performance validated on a 45 mm × 30 mm × 23.8 mm fin-type heatsink per JESD-51 standards.

Key Specifications

Pinout & Package

Package: JEDEC TO-220AB, "Green" halogen- and antimony-free molding compound (UL 94V-0), lead-free and RoHS compliant. Polarity marked on case; weight ≈ 1.927 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STPS30H120CG and VBSE08120, G30H120CTW delivers the optimal balance of automotive qualification, 280 A surge tolerance, and 0.66 V forward drop-making it preferred for OBCs and high-reliability industrial SMPS where both ruggedness and efficiency matter.

Availability

G30H120CTW is available at Aetrix Electronics and suitable for on-board DC-DC converters, high-frequency inverters, and automotive onboard chargers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for G30H120CTW 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 computing markets.

G30H120CTW belongs to Diodes' AEC-Q101-qualified trench Schottky rectifier product line, engineered specifically for high-frequency, high-reliability power conversion in automotive and industrial environments where low VF, high TJ, and robust surge capability are critical.

FAQ

Is G30H120CTW suitable for synchronous rectification circuits?

No-G30H120CTW is a unidirectional Schottky rectifier, not a MOSFET-based synchronous rectifier. It lacks gate control and cannot be actively switched. It functions as a passive, low-loss freewheeling or output rectifier in non-synchronous topologies such as flyback, forward, or LLC secondary-side rectification where zero Qrr is advantageous.

What is the maximum recommended case temperature for continuous 30 A operation?

The datasheet specifies I(AV) = 30 A at Tc = 110°C. Operation above this case temperature requires derating per Figure 1: at Tc = 125°C, average current must be reduced to ~25 A; at Tc = 150°C, it drops to ~15 A. Sustained 30 A operation beyond 110°C risks exceeding the 175°C maximum junction temperature.

Does the TO-220AB package require insulating hardware when mounted to a heatsink?

Yes-the metal tab (PIN 3) is internally connected to the cathode (PIN 2). If the heatsink is grounded or at a different potential than the cathode net, electrical isolation via mica or polymer washers and shoulder washers is mandatory to prevent short circuits and ensure safe operation.

How does the 980 pF junction capacitance affect EMI in high-frequency designs?

At 1–2 MHz switching frequencies, 980 pF contributes measurable displacement current during voltage transitions, potentially increasing common-mode EMI. Layout best practices-such as minimizing loop area between anode/cathode traces and using local RC snubbers-are recommended to suppress ringing caused by this capacitance interacting with circuit inductance.