Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Diode Arrays

Diodes Incorporated SDT40H120CT

Name: SDT40H120CT
Brand: Diodes Incorporated
SKU: SDT40H120CT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SDT40H120CT

Manufacturer:: Diodes Incorporated

Category:: Diode Arrays

Package:: TO-220-3

Datasheet:: SDT40H120CT.pdf

Description:: DIODE ARR SCHOT 120V 20A TO2203

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:50

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SDT40H120CT from Diodes Incorporated is a 40A dual common-cathode Trench Schottky rectifier rated at 120V V_RRM, with 0.82V max forward voltage at 20A/25°C and 120µA max reverse leakage at 120V/25°C. It delivers low conduction loss and high-temperature stability for high-efficiency DC-DC converters and AC-DC adapters in industrial power supplies.

For engineers reviewing the SDT40H120CT datasheet, SDT40H120CT pinout, SDT40H120CT application, or SDT40H120CT equivalent, key selection criteria include per-leg forward voltage (0.76–0.82V), thermal resistance (2°C/W for TO220AB), junction capacitance (≈1000pF @ 10V), soft switching behavior, and AEC-Q101 readiness via IATF 16949 manufacturing.

Technical Context

This dual-diode device integrates two independent 20A Schottky junctions in a single TO220AB package with common cathode configuration. Its trench-based structure enables lower VF and superior IR stability up to +150°C junction temperature compared to planar Schottkys.

The device operates with soft, fast recovery (no minority-carrier tail) and exhibits minimal capacitive charge storage-critical for reducing EMI and switching losses in synchronous rectification and high-frequency SMPS topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	120 V - Maximum repetitive reverse blocking voltage per leg; defines safe operating range in 48V–96V bus systems.
I_O (per leg)	20 A - Continuous average forward current per diode leg at 25°C case temperature; total device rating is 40A.
V_F max	0.82 V @ 20A, 25°C - Low conduction loss enables >95% efficiency in 12V/24V output stages with minimal heatsinking.
I_R max	120 µA @ 120V, 25°C - Ultra-low leakage preserves standby power integrity in energy-sensitive applications.
R_θJC	2 °C/W (TO220AB) - Enables 28W dissipation at ΔT = 56°C; supports compact thermal design without forced air.
I_FSM	280 A @ 8.3ms - Robust surge capability withstands inrush and transient overloads in unregulated inputs.
Junction Temp	−55°C to +150°C - Extended range supports under-hood automotive and industrial ambient environments.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode 1)	Anode of first Schottky diode	Connects to input/high-side node; handles up to 20A continuous forward current.
Pin 2 (Cathode)	Common cathode connection	Shared output node for both diodes; must be routed with low-inductance path to minimize ringing.
Pin 3 (Anode 2)	Anode of second Schottky diode	Independent input path; enables dual-output or interleaved converter configurations.

Key Features

Feature	Design Value
Low forward voltage drop	0.76V typ. @ 20A/25°C - Reduces conduction loss by ≥15% vs. standard Schottkys, improving full-load efficiency.
High-temperature leakage stability	30µA @ 120V/125°C - Maintains <0.1% standby current increase across automotive temperature range.
Soft, fast switching	No reverse recovery charge (Q_rr ≈ 0) - Eliminates switching spikes and EMI in >300kHz converters.
RoHS & Green compliant	Halogen-free (<1500ppm Br+Cl), antimony-free (<1000ppm), lead-free - Meets IPC-1752A Class 3 reporting requirements.

Applications

Server VRM Rectification

Industrial DC-DC Converter

Use Scenario: High-current, high-frequency buck converter supplying 12V/30A to CPU core logic.

IC Role / Device Role / Timing Role: Synchronous rectifier diode replacing MOSFET body diode in secondary-side synchronous rectification.

Use Value: 0.76V V_F minimizes conduction loss at 20A/leg, enabling >96% efficiency without active cooling.

Use Scenario: 48V-to-12V isolated DC-DC module in programmable logic controller (PLC) power stage.

IC Role / Device Role / Timing Role: Output rectifier in center-tapped transformer secondary winding.

Use Value: Dual common-cathode configuration simplifies PCB layout and reduces component count vs. discrete diodes.

AC-DC Adapter Secondary

Automotive On-Board Charger (OBC)

Use Scenario: 100W universal-input adapter delivering 20V/5A for laptop charging.

IC Role / Device Role / Timing Role: Output freewheeling diode in flyback secondary circuit.

Use Value: Soft switching eliminates audible noise and reduces snubber losses, meeting CISPR-32 Class B EMI limits.

Use Scenario: 3.3kW bidirectional OBC rectifying 400V DC link during AC charging mode.

IC Role / Device Role / Timing Role: Boost-stage freewheel diode in PFC front-end and isolation-stage rectifier.

Use Value: 150°C max junction temperature and AEC-Q101-aligned process support under-hood thermal cycling reliability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-40CPH03-M3	30V V_RRM, 40A total, TO247 package, R_θJC = 1.5°C/W, VF = 0.45V @ 20A	Lower voltage rating; suited for ≤24V systems only; higher thermal performance but incompatible with 120V blocking.	Select when system bus voltage ≤30V and ultra-low VF is prioritized over voltage margin.
ON Semiconductor MBR40120CT	120V V_RRM, 40A total, TO220AB, VF = 0.89V @ 20A, IR = 200µA @ 120V/25°C	Higher VF and leakage; older planar process; no AEC-Q101 qualification path.	Acceptable for cost-sensitive non-automotive designs where 70mV higher VF and 67% higher leakage are tolerable.

Compared with VS-40CPH03-M3 and MBR40120CT, SDT40H120CT uniquely balances 120V blocking, 0.82V VF, 120µA IR, and IATF 16949 manufacturing-making it optimal for 48V–96V industrial and automotive auxiliary power rails requiring long-term thermal reliability.

Availability

SDT40H120CT is available at Aetrix Electronics and suitable for DC-DC converters, AC-DC adapters, and industrial power supplies requiring stable component supply, extended temperature operation, and RoHS/Green compliance.

Supply support for SDT40H120CT 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design, manufacturing, and distribution operations across Asia, the Americas, and Europe.

This device belongs to Diodes' high-performance Trench Schottky Rectifier product line, engineered specifically for high-efficiency, high-reliability power conversion in industrial, computing, and automotive applications.

FAQ

What is the maximum junction temperature and how does it affect derating?

The SDT40H120CT has a maximum junction temperature of +150°C. At case temperatures above +80°C, its average forward current must be linearly derated per Figure 4 in the datasheet-reaching zero at +150°C. With R_θJC = 2°C/W and 28W max power dissipation, proper heatsinking is required to sustain 20A/leg beyond 70°C ambient.

Is SDT40H120CT qualified for automotive use?

While SDT40H120CT itself is not AEC-Q101 certified, Diodes states that automotive-grade versions (with change control, PPAP capability, and IATF 16949 manufacturing) are available upon request. The base device shares the same die and process flow, making qualification path straightforward for Tier 1 suppliers.

How does the common-cathode configuration impact PCB layout?

The common-cathode pin (Pin 2) serves as the shared output node for both diodes, allowing symmetrical current paths and reduced loop inductance in dual-phase or interleaved converters. Layout best practice requires direct, wide copper pour connection to ground or output capacitor to minimize voltage overshoot during switching transitions.

What is the typical junction capacitance and why does it matter?

Typical junction capacitance is ~1000pF at 10V reverse bias (Figure 5). This low C_J value minimizes displacement current during hard-switching events, reducing EMI generation and gate drive loading in synchronous rectifier controllers-especially critical in >500kHz designs.

SDT40H120CT Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Diode Configuration:: 1 Pair Common Cathode

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 120 V

Current - Average Rectified (Io) (per Diode):: 20A

Voltage - Forward (Vf) (Max) @ If:: 820 mV @ 20 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 120 µA @ 120 V

Operating Temperature - Junction:: -55°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-3

SDT40H120CT FAQ

1.How can I place an order for SDT40H120CT through Aetrix?

Please submit a Request for Quotation (RFQ) for SDT40H120CT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SDT40H120CT reliable?

The price and inventory of SDT40H120CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDT40H120CT is usually 5 days.

3.What payment methods are accepted for SDT40H120CT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDT40H120CT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SDT40H120CT?

SDT40H120CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SDT40H120CT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SDT40H120CT?

For technical support, including SDT40H120CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDT40H120CT requirements.

6.How does Aetrix verify that SDT40H120CT is sourced from the original manufacturer or authorized distributors?

All SDT40H120CT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SDT40H120CT meets industry standards.

7.What is the process for return or replacement of SDT40H120CT?

All SDT40H120CT units undergo pre-shipment inspection (PSI). If there is an issue with SDT40H120CT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SDT40H120CT part is unused and in its original packaging.

Return procedure for SDT40H120CT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…