Diodes Incorporated SDT40H100CT

Overview

SDT40H100CT from Diodes Incorporated is a 40A dual common-cathode trench Schottky rectifier rated for 100V reverse voltage, with 0.70V max forward voltage at 20A/25°C and 120µA max reverse leakage at 100V/25°C. It serves as a high-efficiency output rectifier or freewheel diode in high-frequency DC-DC converters and AC-DC adapters operating under thermally demanding conditions.

For engineers reviewing the SDT40H100CT datasheet, SDT40H100CT pinout, SDT40H100CT application, or SDT40H100CT equivalent, key selection criteria include per-leg 20A average current rating, TO220AB thermal resistance of 2°C/W (with heatsink), soft switching behavior, high-temperature leakage stability up to +150°C, and AEC-Q101 readiness for automotive power systems.

Technical Context

This dual-diode Schottky rectifier integrates two independent 100V/20A legs sharing a common cathode terminal, enabling synchronous or interleaved converter topologies. Its trench MOS structure delivers lower VF than planar Schottkys while maintaining low IR drift across -55°C to +150°C junction range.

The device operates with soft, fast recovery (no stored charge tail) and exhibits <1000pF junction capacitance at 5V reverse bias-critical for minimizing switching losses in 100–500kHz SMPS designs. Thermal performance is defined by RθJC = 2°C/W (TO220AB, 50mm×50mm×23mm heatsink), supporting sustained 40A total device current at TC ≤ 85°C.

Key Specifications

Pinout & Package

Package: TO220AB (Generic), 3-terminal molded plastic case with matte tin-plated copper leadframe, UL 94V-0 rated, weight ≈1.85g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with VS-40CPH01-M3 and MBR40100CT, SDT40H100CT offers the lowest VF (0.70V max) and best high-temperature IR stability (30µA @ 125°C), making it optimal for thermally constrained, efficiency-critical 48V–60V systems requiring AEC-Q101 compliance.

Availability

SDT40H100CT is available at Aetrix Electronics and suitable for server VRMs, industrial DC-DC converters, automotive ADAS power supplies, and medical imaging adapters requiring stable component supply across multi-year production cycles.

Supply support for SDT40H100CT 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 the Americas.

This device belongs to Diodes' high-efficiency trench Schottky rectifier product line, engineered specifically for high-frequency, high-current power conversion in automotive, industrial, and computing applications where thermal robustness and low conduction loss are critical.

FAQ

Is SDT40H100CT suitable for automotive applications?

Yes. SDT40H100CT is AEC-Q101 qualified and manufactured in IATF 16949 certified facilities. Its -55°C to +150°C operating range, stable leakage up to 125°C, and PPAP-capable supply chain make it appropriate for under-hood power modules, ADAS ECUs, and body control units requiring automotive-grade reliability.

What is the difference between SDT40H100CT and SDT40H100CTFP?

SDT40H100CT uses the standard TO220AB package, while SDT40H100CTFP uses the insulated ITO220AB (Type HE) variant with enhanced creepage/clearance and improved thermal isolation. Both share identical electrical specs, but ITO220AB FP is preferred for reinforced insulation requirements in medical or industrial safety-critical designs.

Can SDT40H100CT be paralleled for higher current?

Yes, but only with matched VF devices and symmetrical PCB layout. The datasheet specifies per-leg ratings; paralleling requires thermal balancing via shared heatsink and equal trace lengths. Derate total current by 15% to account for VF mismatch-induced current imbalance at elevated temperatures.

Does SDT40H100CT require a heatsink in typical operation?

Yes. At 40A total current and 0.70V VF, power dissipation exceeds 28W. With RθJC = 2°C/W, even a modest 20°C rise above case requires active or substantial passive heatsinking. Operation without a heatsink is limited to ≤5A per leg at room temperature, per Figure 4 derating curves.