Diodes Incorporated SDT40H120CTFP

Overview

SDT40H120CTFP from Diodes Incorporated is a 40A dual common-cathode Trench Schottky rectifier in ITO-220AB package, rated for 120V reverse voltage, with max 0.82V forward voltage at 20A/25°C and 120µA reverse leakage at 120V/25°C - optimized for high-efficiency DC-DC converters and AC-DC adapters operating under thermal stress.

For engineers reviewing the SDT40H120CTFP datasheet, SDT40H120CTFP pinout, SDT40H120CTFP application, or SDT40H120CTFP equivalent, key selection criteria include high-temperature leakage stability (≤30µA at 125°C), soft fast switching behavior, low thermal resistance (4°C/W junction-to-case), and automotive-grade packaging compliance (AEC-Q101 capable, IATF 16949 manufactured).

Technical Context

This dual-diode Schottky rectifier integrates two independent 20A legs sharing a common cathode terminal, enabling synchronous rectification or dual-output configurations. Its trench MOS structure delivers lower VF and superior IR stability vs. planar Schottkys - especially critical above 100°C where leakage remains ≤30µA at full VR.

The device operates within -55°C to +150°C junction range and sustains non-repetitive surge currents up to 200A (8.3ms half-sine) in ITO-220AB. Thermal design leverages 4°C/W RθJC with standard 50×50×23mm heatsink, supporting continuous 40A total output when derated per case temperature curves.

Key Specifications

Pinout & Package

Package: ITO-220AB - Insulated through-hole plastic package with internal isolation barrier, matte tin-plated copper leadframe, UL 94V-0 rated molding compound, and 1.90g mass. Designed for direct heatsink mounting without insulating washer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH12 and MBR40H120CT, SDT40H120CTFP offers the best balance of low-temperature VF, ultra-stable high-temp IR, and automotive-ready supply chain - making it preferred for thermally aggressive, mission-critical power stages where leakage-induced failure modes must be eliminated.

Availability

SDT40H120CTFP is available at Aetrix Electronics and suitable for server DC-DC power supplies, industrial AC-DC adapters, and automotive on-board chargers requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SDT40H120CTFP 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.

SDT40H120CTFP 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 demanding low VF and exceptional thermal stability.

FAQ

What is the maximum junction temperature rating for SDT40H120CTFP?

The SDT40H120CTFP is rated for continuous operation from -55°C to +150°C junction temperature. This rating is validated per JEDEC JESD22-A108 and supported by thermal characterization data showing stable electrical parameters up to TJ = +150°C, including leakage current ≤30µA at 120V reverse bias.

Does SDT40H120CTFP require a heatsink in 40A continuous operation?

Yes - at 40A total (20A per leg), power dissipation reaches ~16.4W (based on VF = 0.82V). With RθJC = 4°C/W and typical RθCA ≈ 10°C/W, a heatsink maintaining TC ≤ 85°C is mandatory. Derating curves in Figure 4 confirm 40A is only sustainable below TC = 65°C without forced air.

Is SDT40H120CTFP pin-compatible with SDT40H120CT?

No - SDT40H120CT uses TO-220AB (non-insulated), while SDT40H120CTFP uses ITO-220AB (insulated). Though both have identical 3-pin dual-anode/common-cathode configuration, the ITO-220AB's internal isolation barrier prevents direct mechanical substitution without PCB layout revision and thermal interface reassessment.

What automotive qualifications does SDT40H120CTFP meet?

SDT40H120CTFP is manufactured in IATF 16949-certified facilities and supports AEC-Q101 qualification testing. While the base part is not pre-qualified, Diodes provides PPAP documentation and change control for automotive customers - confirmed via Diodes' Product Definitions page and direct contact with regional representatives.