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Diodes Incorporated SDT40A120CT
- Part No.:
- SDT40A120CT
- Manufacturer:
- Diodes Incorporated
- Category:
- Diode Arrays
- Package:
- TO-220-3
- Datasheet:
-
SDT40A120CT.pdf
- Description:
- DIODE ARR SCHOT 120V 20A TO2203
- Quantity:
- Payment:
- Shipping:
Inventory:50
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Product details
Overview
SDT40A120CT from Diodes Incorporated is a 40A dual-leg trench Schottky rectifier in TO220AB package, rated for 120V reverse voltage per leg, with max 0.88V 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.
For engineers reviewing the SDT40A120CT datasheet, SDT40A120CT pinout, SDT40A120CT application, or SDT40A120CT equivalent, key selection criteria include per-leg thermal resistance (2°C/W), soft fast switching behavior, high-temperature leakage stability up to +150°C, and AEC-Q101 readiness for automotive power systems.
Technical Context
This dual-common-cathode Schottky rectifier integrates two independent 20A legs sharing one cathode terminal, enabling synchronous rectification or dual-output DC-DC topologies. Its trench MOS structure delivers lower VF and superior IR stability versus planar Schottkys, especially above +100°C.
Designed for high-frequency switching applications, it exhibits soft recovery with minimal reverse recovery charge (Qrr not specified but implied by "soft, fast switching" claim), low junction-to-case thermal resistance (2°C/W on TO220AB with heatsink), and operates across –55°C to +150°C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM (Per Leg) | 120 V - Maximum repetitive reverse blocking voltage per diode leg; defines safe operating limit in flyback or buck-boost clamp circuits. |
| IO (Per Leg) | 20 A - Continuous average forward current per leg at TA = +25°C; total device rating is 40A with shared cathode. |
| VF Max @ 20A/25°C | 0.88 V - Peak forward voltage drop at rated DC current; directly determines conduction loss and thermal load in high-current paths. |
| IR Max @ 120V/25°C | 120 µA - Maximum reverse leakage per leg at full rated voltage and room temperature; critical for standby power and high-impedance bias networks. |
| RθJC (TO220AB) | 2 °C/W - Junction-to-case thermal resistance with 50mm × 50mm × 23mm Al heatsink; enables precise thermal design for forced-air or passive cooling. |
| TJ Range | –55°C to +150°C - Full operational junction temperature range; supports under-hood automotive and industrial power supply environments. |
| IFSM (8.3ms) | 250 A - Non-repetitive surge current capability per leg; withstands inrush and transient overloads without degradation. |
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 A) | Anode of Leg A | Input terminal for first Schottky diode leg; connects to switching node in synchronous rectifier or input rail in dual-output configuration. |
| Pin 2 (Cathode) | Common Cathode | Shared output node for both legs; ties to ground or low-side return path; requires low-inductance layout for EMI control. |
| Pin 3 (Anode B) | Anode of Leg B | Input terminal for second independent Schottky leg; enables dual-channel rectification or phase-split operation in interleaved topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Low Forward Voltage Drop | 0.88 V max @ 20A/25°C - reduces conduction loss by ≥15% vs. standard silicon rectifiers, improving efficiency in 12V–48V DC-DC stages. |
| High-Temperature Leakage Stability | 25 µA max @ 120V/125°C - maintains low standby power and prevents thermal runaway in sealed enclosures or hot ambient conditions. |
| Soft, Fast Switching | No hard reverse recovery edge - minimizes EMI generation and ringing during turn-off, easing filter design in high-frequency SMPS. |
| Automotive-Qualified Construction | AEC-Q101 compliant process, IATF 16949 manufacturing, PPAP-capable - meets baseline reliability requirements for engine control and body electronics. |
| Green & RoHS Compliance | Halogen-free (<900 ppm Br/Cl), antimony-free, lead-free finish - satisfies EU environmental directives and end-of-life recycling mandates. |
Applications
| Server Power Supply | Industrial Motor Drive |
|---|---|
|
Use Scenario: Secondary-side synchronous rectification in 48V input telecom rectifiers delivering 12V/20A outputs. IC Role / Device Role / Timing Role: Dual-leg Schottky rectifier replacing MOSFETs in LLC resonant converter secondary, handling 20A per phase with shared cathode return. Use Value: 0.88V VF reduces conduction loss by 2.2W per leg vs. 1.1V Si diode, lowering heatsink size and improving 80 PLUS Titanium efficiency compliance. |
Use Scenario: Freewheeling path for IGBT half-bridge in 24V servo drive inverters with regenerative braking. IC Role / Device Role / Timing Role: Bidirectional freewheel diode pair clamping inductive kickback during PWM dead-time, leveraging soft recovery to suppress voltage spikes. Use Value: 250A IFSM withstands motor stall currents; 2°C/W RθJC enables direct mounting to aluminum chassis without auxiliary heatsinks. |
| Automotive ADAS Camera Module | Medical Imaging Power Stage |
|
Use Scenario: Input rectification and hold-up in compact 12V→5V/3.3V DC-DC module powering radar sensor SoCs. IC Role / Device Role / Timing Role: Primary input bridge rectifier feeding active clamp forward converter, operating continuously at +105°C under hood. Use Value: 120µA IR at 25°C and only 25µA at 125°C ensures <100µW standby dissipation, preserving battery life in always-on vision systems. |
Use Scenario: High-reliability output rectification in X-ray generator HV power supplies requiring low-noise, low-leakage DC rails. IC Role / Device Role / Timing Role: Low-noise blocking diode isolating dual 24V outputs feeding analog front-end and digital control subsystems. Use Value: Trench Schottky architecture eliminates minority-carrier storage delay, preventing cross-conduction faults during rapid load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-leg Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-40CPH03-M3 | 30V VRRM, 40A total, VF = 0.47V @ 20A/25°C, RθJC = 1.5°C/W | Lower voltage rating limits use to ≤24V systems; better for ultra-low VF priority in POL converters. | Select when system VRRM ≤30V and lowest possible conduction loss is critical; unsuitable for 120V bus applications. |
| ON Semiconductor MBR40120CT | 120V VRRM, 40A total, VF = 0.92V @ 20A/25°C, RθJC = 2.5°C/W, no AEC-Q101 qualification | Higher VF increases conduction loss; lacks automotive change control and PPAP support. | Acceptable for cost-sensitive industrial supplies where AEC-Q101 is not required; verify thermal margin due to higher RθJC. |
Compared with VS-40CPH03-M3 and MBR40120CT, SDT40A120CT uniquely balances 120V blocking, sub-0.88V VF, 2°C/W thermal performance, and AEC-Q101 readiness - making it the only option qualified for automotive-grade 48V–120V DC-DC rectification with production traceability.
Availability
SDT40A120CT is available at Aetrix Electronics and suitable for server power supplies, industrial motor drives, and automotive ADAS camera modules requiring stable component supply and long-term manufacturability.
Supply support for SDT40A120CT 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.
This device belongs to Diodes' SBR® (Schottky Barrier Rectifier) trench product line, engineered specifically for high-efficiency, high-reliability power conversion in automotive, industrial, and computing applications demanding low VF and robust high-temperature operation.
FAQ
What is the difference between SDT40A120CT and SDT40A120CTFP?
The SDT40A120CT uses the standard TO220AB package, while SDT40A120CTFP uses the insulated ITO220AB variant with enhanced creepage/clearance for high-isolation applications. Both share identical electrical specs, but ITO220AB provides reinforced insulation and higher thermal resistance (4°C/W vs. 2°C/W), making it preferred for medical or industrial safety-critical designs.
Is SDT40A120CT suitable for automotive applications?
Yes - Diodes states this part is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-qualified to AEC-Q101 in the public datasheet, Diodes confirms it meets AEC-Q101 stress test requirements upon request and is used in production automotive power modules including ADAS camera supplies and body control units.
How does the dual-leg configuration affect PCB layout?
The common-cathode configuration requires symmetrical copper pour on the cathode pad to balance thermal and current distribution between legs. Anode traces must be length-matched and routed with equal impedance to prevent current imbalance; thermal vias under the cathode tab are recommended to transfer heat to inner layers or heatsink.
What is the maximum operating frequency for optimal performance?
While no explicit fmax is specified, the "soft, fast switching" characteristic and low Qrr (inferred from trench architecture and typical Schottky behavior) support reliable operation up to 500 kHz in hard-switched topologies and >1 MHz in resonant converters. Performance degrades above 1 MHz due to junction capacitance (≈1000 pF at 0 V).
SDT40A120CT 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:
- 880 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
SDT40A120CT FAQ
1.How can I place an order for SDT40A120CT through Aetrix?
Please submit a Request for Quotation (RFQ) for SDT40A120CT 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 SDT40A120CT reliable?
The price and inventory of SDT40A120CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDT40A120CT is usually 5 days.
3.What payment methods are accepted for SDT40A120CT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDT40A120CT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDT40A120CT?
SDT40A120CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDT40A120CT 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 SDT40A120CT?
For technical support, including SDT40A120CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDT40A120CT requirements.
6.How does Aetrix verify that SDT40A120CT is sourced from the original manufacturer or authorized distributors?
All SDT40A120CT 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 SDT40A120CT meets industry standards.
7.What is the process for return or replacement of SDT40A120CT?
All SDT40A120CT units undergo pre-shipment inspection (PSI). If there is an issue with SDT40A120CT, 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 SDT40A120CT part is unused and in its original packaging.
Return procedure for SDT40A120CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDT40A120CT Tags
-
BAV99-7-F
Diodes Incorporated
-
BAT54C-7-F
Diodes Incorporated
-
BAV99,215
Nexperia USA Inc.
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BAT54SLT1G
onsemi
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BAV70LT1G
onsemi
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BAT54CLT1G
onsemi
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BAT54S-7-F
Diodes Incorporated
-
BAV99LT1G
onsemi
-
BAT54S,215
Nexperia USA Inc.
-
BAS40-04LT1G
onsemi
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MMBD1503-TP
Micro Commercial Co
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BAV99WT1G
onsemi
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