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STMicroelectronics STPS40SM120CT
- Part No.:
- STPS40SM120CT
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- TO-220-3
- Datasheet:
-
STPS40SM120CT.pdf
- Description:
- DIODE ARR SCHOTT 120V 20A TO-220
- Quantity:
- Payment:
- Shipping:
Inventory:966
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Product details
Overview
STPS40SM120CT from STMicroelectronics is a dual common-cathode 120 V, 40 A (total) Schottky rectifier in TO-220AB package, optimized for high-frequency SMPS in notebook/desktop adapters. It delivers typ. 0.63 V forward voltage at 125 °C/20 A per diode, supports 210 A non-repetitive surge current, and features avalanche-rated ruggedness with 1150 W peak avalanche power.
For engineers reviewing the STPS40SM120CT datasheet, STPS40SM120CT pinout, STPS40SM120CT application, or STPS40SM120CT equivalent, key selection criteria include low VF at high junction temperature, dual-diode thermal coupling behavior, Rth(j-c) = 0.93 °C/W (total), and ECOPACK®2 compliance for lead-free industrial assembly.
Technical Context
This dual Schottky rectifier integrates two independent 20 A diodes sharing a common cathode terminal, enabling synchronous or interleaved operation in center-tapped or full-bridge secondary topologies. Its low Qrr and negligible reverse recovery charge support >300 kHz switching frequencies without snubber circuits.
The device operates up to 150 °C junction temperature with thermally coupled die structure-Rth(c) = 0.50 °C/W between diodes enables accurate thermal modeling when both diodes conduct simultaneously, critical for high-density adapter derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 120 V - Withstands repetitive reverse voltage up to 120 V, suitable for 48 V–60 V output rails with margin. |
| IF(AV) per diode | 20 A - Sustains 20 A average forward current per diode at TC = 125 °C, enabling 40 A total output capability. |
| VF (typ.) | 0.63 V @ 125 °C, 20 A - Low conduction loss reduces heat generation in compact adapters. |
| IFS M | 210 A @ tp = 10 ms - Handles inrush and transient surges without failure during cold-start or short-circuit events. |
| Rth(j-c) total | 0.93 °C/W - Enables precise heatsink sizing for dual-diode thermal management under shared load conditions. |
| IR @ 125 °C | 50 mA max @ VR = 120 V - Leakage remains manageable at elevated temperature, limiting standby losses. |
| ECOPACK®2 | Lead-free, RoHS-compliant packaging - Meets global environmental regulations for industrial and consumer production. |
Pinout & Package
TO-220AB package with isolated mounting tab (electrically connected to cathode), 3-pin configuration: Pin 1 = Anode 1, Pin 2 = Cathode (common), Pin 3 = Anode 2. Epoxy meets UL 94 V0; recommended torque: 0.55 N·m.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode 1 | Input terminal for first diode leg; electrically isolated from tab and Pin 3. |
| Pin 2 | Common Cathode | Shared cathode node; internally bonded to metal tab-must be electrically tied to system ground or return path. |
| Pin 3 | Anode 2 | Input terminal for second diode leg; electrically isolated from tab and Pin 1. |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche-rated ruggedness | 1150 W peak avalanche power at Tj = 125 °C, tp = 10 µs-enables reliable operation under inductive switching stress. |
| Low VF at high temperature | 0.63 V typ. @ 125 °C/20 A per diode-reduces conduction loss by ~18% vs. standard Schottkys at same condition. |
| Dual-diode thermal coupling | Rth(c) = 0.50 °C/W between diodes-allows accurate junction temperature prediction when both legs conduct concurrently. |
| High-frequency suitability | Negligible reverse recovery (Qrr ≈ 0)-eliminates switching loss and EMI concerns above 300 kHz. |
| ECOPACK®2 compliance | Lead-free, halogen-free, RoHS-compliant construction-meets IPC/JEDEC J-STD-020D reflow profiles for automated assembly. |
Applications
| Notebook AC-DC Adapter | Desktop PC Power Supply |
|---|---|
Use Scenario: Secondary-side rectification in 65–120 W multi-output flyback or LLC resonant converters. IC Role / Device Role / Timing Role: Dual common-cathode Schottky rectifier replacing two discrete diodes to reduce PCB area and thermal interface count. Use Value: 0.63 V VF at 125 °C cuts conduction loss by 1.2 W per diode vs. legacy 0.75 V parts, improving full-load efficiency by 0.8–1.1%. | Use Scenario: +12 V and +5 V rail synchronous rectification in ATX PSUs with active clamp or resonant topologies. IC Role / Device Role / Timing Role: High-current dual rectifier handling combined 30–40 A output loads with shared thermal path to heatsink. Use Value: Rth(j-c) = 0.93 °C/W (total) enables 25 °C lower junction rise than two separate TO-220 devices under identical airflow, extending lifetime. |
| Gaming Console Power Adapter | LED Driver Secondary Rectification |
Use Scenario: Compact 90–150 W adapter powering high-performance gaming hardware with tight thermal envelopes. IC Role / Device Role / Timing Role: Primary high-current rectifier in asymmetric half-bridge secondary, leveraging avalanche rating for fault tolerance. Use Value: 210 A IFSM withstands repeated 100 A inrush spikes during hot-plug events without degradation over 10,000 cycles. | Use Scenario: Constant-current LED driver output stage delivering 2–5 A to high-brightness COB arrays. IC Role / Device Role / Timing Role: Low-VF, low-leakage rectifier minimizing standby power in dimmed or PWM-controlled lighting systems. Use Value: 50 mA max IR at 125 °C limits no-load dissipation to <15 mW per diode-critical for Energy Star Tier 2 compliance. |
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 | Single-anode, single-cathode TO-247; VF = 0.65 V @ 20 A/125 °C; Rth(j-c) = 1.0 °C/W. | Requires two devices for dual-channel use; larger footprint and higher thermal resistance. | Prefer when board layout allows discrete placement and higher surge margin (240 A IFSM) is prioritized over integration. |
| ON Semiconductor MBR40120CT | TO-220AB package; VF = 0.72 V @ 20 A/125 °C; IR = 100 mA @ 125 °C; no avalanche rating. | Higher conduction loss and leakage; lacks avalanche ruggedness for unclamped inductive transients. | Select only for cost-sensitive, non-avalanche-critical designs where 0.09 V higher VF is acceptable. |
Compared with VS-40CPH12 and MBR40120CT, STPS40SM120CT uniquely combines dual-diode integration, lowest VF at operating temperature, and certified avalanche capability-making it optimal for space-constrained, high-efficiency, and reliability-critical adapter designs.
Availability
STPS40SM120CT is available at Aetrix Electronics and suitable for notebook adapters, desktop PC power supplies, gaming console chargers, and LED driver secondary stages requiring stable component supply across extended production lifecycles.
Supply support for STPS40SM120CT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The STPSx series targets high-efficiency, high-power-density AC-DC and DC-DC conversion, with emphasis on Schottky rectifiers optimized for thermal performance, avalanche robustness, and eco-compliance in compact power adapters.
FAQ
What is the maximum continuous junction temperature for STPS40SM120CT?
The absolute maximum operating junction temperature is 150 °C, validated per STMicroelectronics DS8940 Rev 4. Operation beyond this limit risks irreversible parametric shift and accelerated degradation. Derating curves in Figure 2 confirm 20 A per diode is sustainable only up to 125 °C case temperature under δ = 0.5 duty cycle.
Is the metal tab electrically isolated in the TO-220AB package?
No-the metal tab is internally connected to Pin 2 (common cathode) and must be treated as an active circuit node. It is not electrically isolated and requires appropriate insulation from heatsink if the cathode is not at chassis ground potential.
How does the dual-diode thermal coupling affect PCB layout?
Because Rth(c) = 0.50 °C/W couples heat between diodes, both anodes must share a common thermal plane or heatsink surface. Splitting them across separate copper zones causes unequal junction temperatures and premature failure of the hotter diode under balanced load conditions.
Can STPS40SM120CT replace STPS30SM120CT in existing designs?
Yes-both share identical pinout, package, and VRRM rating, but STPS40SM120CT offers +10 A higher IF(AV) per diode (20 A vs. 15 A) and improved VF (0.63 V vs. 0.65 V typ. @ 125 °C). No layout change is needed, and thermal margin increases by ~12% at full load.
STPS40SM120CT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 830 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 275 µA @ 120 V
- Operating Temperature - Junction:
- 150°C (Max)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
STPS40SM120CT FAQ
1.How can I place an order for STPS40SM120CT through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS40SM120CT 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 STPS40SM120CT reliable?
The price and inventory of STPS40SM120CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS40SM120CT is usually 5 days.
3.What payment methods are accepted for STPS40SM120CT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS40SM120CT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS40SM120CT?
STPS40SM120CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS40SM120CT 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 STPS40SM120CT?
For technical support, including STPS40SM120CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS40SM120CT requirements.
6.How does Aetrix verify that STPS40SM120CT is sourced from the original manufacturer or authorized distributors?
All STPS40SM120CT 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 STPS40SM120CT meets industry standards.
7.What is the process for return or replacement of STPS40SM120CT?
All STPS40SM120CT units undergo pre-shipment inspection (PSI). If there is an issue with STPS40SM120CT, 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 STPS40SM120CT part is unused and in its original packaging.
Return procedure for STPS40SM120CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS40SM120CT Tags
-
BAV99-7-F
Diodes Incorporated
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BAT54C-7-F
Diodes Incorporated
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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
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BAV99LT1G
onsemi
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BAT54S,215
Nexperia USA Inc.
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BAS40-04LT1G
onsemi
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MMBD1503-TP
Micro Commercial Co
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BAV99WT1G
onsemi
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