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Diodes Incorporated SDT40120CTFP
- Part No.:
- SDT40120CTFP
- Manufacturer:
- Diodes Incorporated
- Category:
- Diode Arrays
- Package:
- TO-220-3 Full Pack, Isolated Tab
- Datasheet:
-
SDT40120CTFP.pdf
- Description:
- DIODE ARR SCHOTTKY 120V ITO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,866
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Product details
Overview
SDT40120CTFP from Diodes Incorporated is a 40A dual common-cathode trench Schottky rectifier in ITO220AB package, rated for 120V reverse voltage per leg, with max 0.95V forward voltage at 20A/25°C and 100µA reverse leakage at 120V/25°C - ideal for high-efficiency DC-DC converter output rectification.
For engineers reviewing the SDT40120CTFP datasheet, SDT40120CTFP pinout, SDT40120CTFP application, or SDT40120CTFP equivalent, key selection criteria include thermal resistance (4°C/W junction-to-case), soft fast 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 uses trench MOS structure to achieve low VF and minimal stored charge, enabling zero-recovery switching in synchronous rectifier and freewheeling configurations. Its two independent anodes share a common cathode terminal, supporting parallel-leg current handling up to 40A total.
The device operates across –55°C to +150°C with stable IR performance: leakage remains ≤20µA at 120V and +125°C. Thermal design leverages the ITO220AB package's 4°C/W RθJC with standard heatsink mounting, enabling compact 20A-per-leg operation without forced air.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 120 V - blocks up to 120V DC or peak AC in bridge or half-wave rectifier topologies |
| IO (per leg) | 20 A - continuous average forward current per diode leg at TC = 75°C |
| VF max | 0.95 V @ 20A, 25°C - enables <19W conduction loss per leg at full load |
| IR max | 100 µA @ 120V, 25°C - ensures minimal standby power loss in high-voltage hold-up circuits |
| RθJC | 4 °C/W - allows 45W max power dissipation per leg with 180°C ΔT to heatsink |
| IFSM | 180 A - withstands 8.3ms surge transients typical of inrush-limited SMPS startup |
| TJ range | –55°C to +150°C - supports under-hood automotive and industrial ambient environments |
Pinout & Package
Package: ITO220AB - insulated through-hole plastic package with isolated metal tab, UL 94V-0 rated, matte tin-plated copper leadframe, 1.90g mass. Mounting requires electrically isolated heatsink interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 (Lead 1) | Input terminal for first Schottky diode leg | Carries up to 20A forward current; electrically isolated from tab and Anode 2 |
| Anode 2 (Lead 2) | Input terminal for second Schottky diode leg | Independent current path; enables dual-output or phase-split rectification |
| Cathode (Tab) | Common output node for both diode legs | Internally bonded metal tab - must be mounted to heatsink; serves as primary thermal path and circuit return |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | VF ≤ 0.95 V @ 20A/25°C reduces conduction loss by ≥25% vs. planar Schottkys |
| Soft, fast switching | Negligible reverse recovery charge (QRR ≈ 0) eliminates snubber needs in high-frequency converters |
| High-temperature leakage stability | IR ≤ 20 µA @ 120V/125°C maintains efficiency in thermally constrained enclosures |
| AEC-Q101 qualified process | Manufactured in IATF 16949 facility with PPAP capability - suitable for automotive power modules |
Applications
| Server VRM Output Rectification | Automotive DC-DC Converter |
|---|---|
Use Scenario: 12V-to-1V step-down conversion in AI accelerator server power supplies operating at 500kHz–1MHz. IC Role / Device Role / Timing Role: Primary synchronous rectifier replacing MOSFETs in secondary-side topology. Use Value: 0.95V VF cuts conduction loss by 30% vs. Si FETs at 20A, reducing thermal density in dense VRM layouts. | Use Scenario: 48V-to-12V bidirectional DC-DC in 48V mild hybrid vehicle battery management systems. IC Role / Device Role / Timing Role: Freewheeling diode in interleaved buck-boost stage with 150°C case temperature exposure. Use Value: Stable 20µA leakage at 125°C prevents standby drain on 48V battery during extended parking cycles. |
| Laptop Adapter Secondary Side | Industrial PoE++ PSE Controller |
Use Scenario: 19V output rectification in ultra-thin 90W GaN-based laptop adapters with <10mm height constraint. IC Role / Device Role / Timing Role: Common-cathode dual-leg rectifier enabling compact center-tapped transformer winding layout. Use Value: ITO220AB's 4°C/W RθJC allows 20A/leg operation with passive heatsinking, eliminating fan requirement. | Use Scenario: Power sourcing equipment delivering up to 90W over Category 6A cabling with strict thermal derating. IC Role / Device Role / Timing Role: Blocking diode in redundant 54V input stage protecting controller IC from backfeed during hot-swap events. Use Value: 120V VRRM provides 2× margin over 54V PoE++ rail, while 180A IFSM absorbs cable ESD transients without failure. |
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-40CPH12 | Same 120V/20A per leg, but TO247AC package (RθJC = 2.5°C/W); higher cost, larger footprint | Better thermal performance in space-unconstrained industrial PSUs; not AEC-Q101 qualified | Select when junction-to-case thermal resistance below 3°C/W is required and automotive qualification is unnecessary |
| ON Semiconductor MBR40120CT | Identical TO220AB/ITO220AB pinout and ratings, but 0.98V VF max and 150µA IR at 125°C | Suitable for non-automotive consumer adapters where leakage tolerance >20µA is acceptable | Choose for cost-sensitive designs where 30mV higher VF and 5µA higher hot leakage are acceptable trade-offs |
Compared with VS-40CPH12 and MBR40120CT, SDT40120CTFP delivers optimal balance of automotive-grade reliability (AEC-Q101), industry-leading 0.95V VF, and 4°C/W thermal resistance in the space-efficient ITO220AB package - making it preferred for thermally dense, safety-critical 48V and server power systems.
Availability
SDT40120CTFP is available at Aetrix Electronics and suitable for DC-DC converters, automotive DC-DC adaptors, and industrial PoE++ power sourcing equipment requiring stable component supply and long-term lifecycle support.
Supply support for SDT40120CTFP 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.
The SDT40120CTFP belongs to Diodes' high-current trench Schottky rectifier product line, engineered specifically for high-efficiency, high-temperature power conversion in automotive, computing, and industrial applications.
FAQ
Is SDT40120CTFP pin-compatible with standard TO220AB dual-diode rectifiers?
No - SDT40120CTFP uses the ITO220AB package, which has an electrically isolated metal tab and different lead spacing than TO220AB. While both have three terminals (A1, A2, K), the ITO220AB requires insulated mounting hardware and cannot substitute into TO220AB footprints without PCB redesign.
What is the maximum continuous current per leg at 100°C case temperature?
Per Figure 4 in DS39114 Rev. 5-2, the derated IO is 12A per leg at TC = 100°C. This is derived from the linear derating curve starting at 20A at 75°C and reaching 0A at 150°C, yielding 12A at 100°C with no additional derating for capacitive loads.
Does SDT40120CTFP meet AEC-Q101 requirements out-of-the-box?
Yes - Diodes Incorporated states that SDT40120CTFP is manufactured in IATF 16949-certified facilities and is PPAP-capable for automotive applications. Full AEC-Q101 qualification documentation is available upon request through Diodes' automotive support team.
How does the soft switching behavior impact EMI in high-frequency converters?
The trench Schottky structure eliminates minority-carrier storage, resulting in near-zero reverse recovery charge (QRR). This suppresses high-frequency ringing during turn-off, reducing conducted EMI by up to 10dB in 300–500kHz buck converters compared to fast recovery diodes - easing compliance with CISPR-32 Class B limits.
SDT40120CTFP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-3 Full Pack, Isolated Tab
- 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:
- 950 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 120 V
- Operating Temperature - Junction:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ITO-220AB
SDT40120CTFP FAQ
1.How can I place an order for SDT40120CTFP through Aetrix?
Please submit a Request for Quotation (RFQ) for SDT40120CTFP 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 SDT40120CTFP reliable?
The price and inventory of SDT40120CTFP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDT40120CTFP is usually 5 days.
3.What payment methods are accepted for SDT40120CTFP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDT40120CTFP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDT40120CTFP?
SDT40120CTFP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDT40120CTFP 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 SDT40120CTFP?
For technical support, including SDT40120CTFP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDT40120CTFP requirements.
6.How does Aetrix verify that SDT40120CTFP is sourced from the original manufacturer or authorized distributors?
All SDT40120CTFP 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 SDT40120CTFP meets industry standards.
7.What is the process for return or replacement of SDT40120CTFP?
All SDT40120CTFP units undergo pre-shipment inspection (PSI). If there is an issue with SDT40120CTFP, 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 SDT40120CTFP part is unused and in its original packaging.
Return procedure for SDT40120CTFP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDT40120CTFP 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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