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Diodes Incorporated SDT40120CT
- Part No.:
- SDT40120CT
- Manufacturer:
- Diodes Incorporated
- Category:
- Diode Arrays
- Package:
- TO-220-3
- Datasheet:
-
SDT40120CT.pdf
- Description:
- DIODE ARR SCHOT 120V 20A TO2203
- Quantity:
- Payment:
- Shipping:
Inventory:59
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Product details
Overview
SDT40120CT from Diodes Incorporated is a 40A dual common-cathode trench Schottky rectifier rated at 120V VRRM, with 0.95V max forward voltage at 20A/25°C and 100µA max reverse leakage at 120V/25°C. It delivers low conduction loss and high-temperature stability for DC-DC converter output rectification and freewheeling in automotive-grade power supplies.
For engineers reviewing the SDT40120CT datasheet, SDT40120CT pinout, SDT40120CT application, or SDT40120CT equivalent, key selection criteria include per-leg 20A average current rating, TO220AB package thermal resistance (2°C/W), soft switching behavior, and AEC-Q101 readiness via IATF 16949 manufacturing.
Technical Context
This dual-diode device integrates two independent 120V/20A Schottky junctions sharing a common cathode terminal, enabling synchronous rectification or dual-output configurations. Its trench MOS structure reduces forward voltage while maintaining tight IR control up to +150°C junction temperature.
The device operates with soft recovery characteristics-critical for reducing EMI in high-frequency switching converters-and exhibits stable VF drift (<±5% from 25°C to 125°C) and IR increase (<20µA at 125°C), supporting reliable operation in thermally constrained automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 120 V - Maximum repetitive reverse blocking voltage per leg; supports 48V–60V bus systems with 2× safety margin. |
| IO (per leg) | 20 A - Continuous average forward current per diode at TC = 75°C; enables 40A total dual-leg output capability. |
| VF max | 0.95 V @ 20A, 25°C - Low conduction loss reduces heat generation by ~30% vs. standard silicon rectifiers at same current. |
| IR max | 100 µA @ 120V, 25°C - Ultra-low leakage preserves efficiency in standby and light-load conditions. |
| RθJC | 2 °C/W - Thermal resistance from junction to case (TO220AB); allows 40W dissipation before reaching 150°C TJ. |
| IFSM | 180 A - Non-repetitive surge rating supports inrush current handling during cold-start in DC-DC modules. |
| TJ range | −55°C to +150°C - Full automotive temperature qualification without derating; suitable for engine control units. |
Pinout & Package
Package: TO220AB (Generic), epoxy-molded plastic housing with matte tin-plated copper leadframe; UL 94V-0 rated; 1.85g mass; isolated mounting tab (cathode-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Tab / Pin 1 | Cathode (common) | Electrically connected to metal tab; must be mounted to heatsink with insulating washer if system ground isolation required. |
| Pin 2 | Anode 1 | Independent anode for first Schottky diode leg; used for primary output path or channel A rectification. |
| Pin 3 | Anode 2 | Independent anode for second Schottky diode leg; enables dual-output or phase-interleaved converter topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | VF ≤ 0.95V @ 20A/25°C - Reduces conduction loss to <19W per leg, lowering heatsink requirements in space-constrained designs. |
| Soft, fast switching | No reverse recovery charge (Qrr ≈ 0) - Eliminates switching spikes and associated snubber losses in >100kHz converters. |
| High-temperature leakage stability | IR ≤ 20µA @ 120V/125°C - Maintains >99.9% blocking integrity in hot ambient environments like EV onboard chargers. |
| AEC-Q101 qualified process | Manufactured in IATF 16949-certified facility - Meets stress test requirements for automotive electronics including HTGB, HTRB, and temperature cycling. |
Applications
| Automotive DC-DC Converter | Server PSU Output Rectification |
|---|---|
|
Use Scenario: 12V-to-48V bidirectional DC-DC stage in mild-hybrid vehicle architectures. IC Role / Device Role / Timing Role: Dual-leg synchronous rectifier replacing MOSFETs in secondary-side topology to reduce gate drive complexity and conduction loss. Use Value: Enables >96% peak efficiency at 20A/channel with no reverse recovery penalty, meeting ISO 16750-2 transient immunity requirements. |
Use Scenario: +12V and +5V dual-output rails in 1U server power supplies operating at 300kHz switching frequency. IC Role / Device Role / Timing Role: Common-cathode dual Schottky for independent regulation of two output channels with shared thermal path. Use Value: Delivers 0.76V VF at 20A/125°C, cutting diode loss by 42% versus legacy 150V Si devices and simplifying thermal management. |
| Industrial Motor Drive Freewheeling | Telecom AC-DC Adapter |
|
Use Scenario: Regenerative braking energy recapture circuit in 3-phase BLDC motor drives with 48V battery input. IC Role / Device Role / Timing Role: Freewheeling diode across each half-bridge leg to clamp inductive kickback during PWM dead-time. Use Value: Soft recovery prevents voltage overshoot beyond 120V rating, eliminating need for clamping Zeners in compact IPM modules. |
Use Scenario: Secondary-side rectification in universal-input (90–264VAC) 65W telecom adapters targeting Level VI efficiency. IC Role / Device Role / Timing Role: Output rectifier in flyback or LLC resonant converter with synchronous rectification disabled. Use Value: 100µA max IR at 25°C ensures <0.5mW standby loss, helping meet DOE/ERP Tier 2 no-load power limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual common-cathode Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-40CPH12-M3 | Same 120V/20A per leg, but higher VF (1.05V max @ 20A/25°C) and higher RθJC (2.5°C/W). | Marginally lower efficiency in high-current, high-ambient scenarios; less suitable for 150°C junction-limited designs. | Prefer SDT40120CT where thermal headroom is constrained or efficiency >95.5% is mandatory. |
| ON Semiconductor MBR40120CT | Identical VRRM/IO, but wider VF distribution (0.7–1.0V typ/max) and no AEC-Q101 documentation in public datasheet. | Lacks formal automotive qualification evidence; requires additional PPAP validation for automotive programs. | Select SDT40120CT when AEC-Q101 compliance, traceable lot data, and IATF 16949 production are contractually required. |
Compared with VS-40CPH12-M3 and MBR40120CT, SDT40120CT provides superior thermal performance (2°C/W vs. ≥2.5°C/W), tighter VF control (0.95V max), and documented automotive qualification-making it optimal for high-reliability, thermally dense, or safety-critical power conversion.
Availability
SDT40120CT is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial motor drives, and telecom AC-DC adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for SDT40120CT 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, testing, and wafer fabrication facilities across Asia and the U.S.
This device belongs to Diodes' high-efficiency trench Schottky rectifier product line, engineered specifically for high-frequency, high-temperature power conversion in automotive, industrial, and computing applications.
FAQ
Is SDT40120CT pin-compatible with standard TO220AB dual-diode rectifiers?
Yes-SDT40120CT uses industry-standard TO220AB mechanical dimensions and 3-pin layout (Anode1–Anode2–Cathode/Tab), matching footprint and mounting hole positions of MBR40120CT, STPS40M120CG, and VS-40CPH12-M3. No PCB redesign is needed for drop-in replacement.
Does SDT40120CT require a thermal pad or insulator when mounted to a heatsink?
Yes-the metal tab is electrically connected to the common cathode. If the heatsink is grounded or at a different potential, a thermally conductive but electrically isolating pad (e.g., mica or ceramic) must be used. Direct mounting is acceptable only when the heatsink shares the cathode reference potential.
What is the maximum recommended case temperature for continuous operation?
The datasheet specifies a maximum junction temperature of +150°C and thermal resistance RθJC = 2°C/W for TO220AB. With 40W total dissipation (20A × 0.95V × 2 legs), the case temperature must remain ≤110°C to maintain 40°C safety margin-achievable with ≥50mm × 50mm × 23mm aluminum heatsink per Diodes' note 5.
Is SDT40120CT suitable for use in synchronous rectification circuits?
No-it is a passive Schottky diode, not a synchronous rectifier IC or MOSFET driver. However, its low VF and zero Qrr make it a preferred alternative to active synchronous solutions in cost-sensitive or EMI-constrained designs where gate drive complexity must be avoided.
SDT40120CT 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:
- 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:
- TO-220-3
SDT40120CT FAQ
1.How can I place an order for SDT40120CT through Aetrix?
Please submit a Request for Quotation (RFQ) for SDT40120CT 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 SDT40120CT reliable?
The price and inventory of SDT40120CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SDT40120CT is usually 5 days.
3.What payment methods are accepted for SDT40120CT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SDT40120CT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SDT40120CT?
SDT40120CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SDT40120CT 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 SDT40120CT?
For technical support, including SDT40120CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SDT40120CT requirements.
6.How does Aetrix verify that SDT40120CT is sourced from the original manufacturer or authorized distributors?
All SDT40120CT 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 SDT40120CT meets industry standards.
7.What is the process for return or replacement of SDT40120CT?
All SDT40120CT units undergo pre-shipment inspection (PSI). If there is an issue with SDT40120CT, 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 SDT40120CT part is unused and in its original packaging.
Return procedure for SDT40120CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SDT40120CT 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
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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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