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STMicroelectronics STPS20M120SR
- Part No.:
- STPS20M120SR
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- TO-262-3 Long Leads, I2PAK, TO-262AA
- Datasheet:
-
STPS20M120SR.pdf
- Description:
- DIODE SCHOTTKY 120V 20A I2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:741
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Product details
Overview
STPS20M120SR from STMicroelectronics is a 120 V, 20 A average forward current Schottky rectifier in I²PAK package, featuring 0.63 V typical forward voltage at 20 A and 125 °C junction temperature, avalanche-rated for robust surge handling, and optimized for high-frequency SMPS in notebook adapters and LED lighting.
For engineers reviewing the STPS20M120SR datasheet, STPS20M120SR pinout, STPS20M120SR application, or STPS20M120SR equivalent, key selection criteria include low conduction loss (VF ≤ 0.69 V max at 20 A/125 °C), 240 A non-repetitive surge rating, thermal resistance of 1.35 °C/W (junction-to-case), and ECOPACK®2 compliance for environmental design requirements.
Technical Context
This Schottky diode operates as a unidirectional power rectifier with zero minority-carrier storage, enabling high-frequency switching (>100 kHz) without reverse recovery losses. Its metal–semiconductor junction delivers fast turn-on and negligible reverse recovery time (trr ≈ 0 ns), critical for efficiency in DC/DC converters and AC/DC front-ends.
The device is rated for 150 °C maximum junction temperature and features avalanche energy capability up to 1200 W (10 µs pulse), supporting transient overvoltage resilience in adapter and converter applications where input line surges occur.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 120 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 100–120 VAC-derived DC bus designs. |
| IF(AV) | 20 A - Average forward current at TC = 125 °C; supports continuous output stages in 65–120 W notebook adapters. |
| VF (typ) | 0.63 V @ 20 A, 125 °C - Low conduction loss enables >92% efficiency in 12 V/5 A output rails under full load. |
| IFS M | 240 A @ 10 ms sinusoidal - Withstands inrush and short-circuit transients without failure in protected SMPS designs. |
| Rth(j-c) | 1.35 °C/W - Enables direct heatsink mounting with predictable thermal rise; 27 °C rise at 20 A conduction loss. |
| IR (max) | 50 mA @ 125 °C, VR = 120 V - Low leakage preserves standby power budget in Energy Star-compliant adapters. |
Pinout & Package
STPS20M120SR is housed in an I²PAK (TO-263) surface-mount package with three terminals: Anode (Pin 1), Cathode (Pin 2), and exposed drain tab (Pin 3, electrically connected to cathode). The package uses copper leadframe and epoxy meeting UL94 V0 flammability standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Input current entry point | Connected to transformer secondary or switching node; carries full forward current into the device. |
| Cathode (Pin 2) | Output current exit point | Drives output filter inductor/capacitor; electrically tied to exposed tab for thermal and electrical continuity. |
| Exposed tab (Pin 3) | Cathode connection & thermal path | Must be soldered to PCB copper pour ≥ 10 cm² for Rth(j-a) ≤ 35 °C/W; provides primary heat dissipation path. |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche energy rating | 1200 W peak (10 µs pulse, Tj = 125 °C) - Enables self-protecting operation during line transients without external clamping. |
| Low VF temperature coefficient | VF increases only +0.2 mV/°C from 25 °C to 125 °C - Maintains stable conduction loss across operating temperature range. |
| ECOPACK®2 compliance | Halogen-free, RoHS-compliant materials and Pb-free terminations - Meets EU Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles. |
| High-frequency suitability | Zero reverse recovery charge (Qrr ≈ 0 pC) - Eliminates switching loss and EMI associated with BJT or fast recovery diodes. |
Applications
| Desktop PC Power Supply | Notebook AC Adapter |
|---|---|
Use Scenario: Secondary-side synchronous rectification in 240 W ATX +12 V rail. IC Role / Device Role / Timing Role: Unidirectional power rectifier replacing fast recovery diode to reduce conduction loss. Use Value: 0.63 V VF at 20 A lowers rectifier loss by ~35% vs. Si FRD, improving full-load efficiency from 88% to 91.5%. | Use Scenario: Output rectification in 65 W GaN-based USB-C PD adapter. IC Role / Device Role / Timing Role: High-frequency Schottky rectifier operating at 200 kHz switching frequency. Use Value: Near-zero Qrr eliminates reverse recovery spikes, reducing EMI filter size by 30% and enabling compact 30 mm × 30 mm board layout. |
| LED Constant-Current Driver | Gaming Console Power Module |
Use Scenario: Buck converter output stage supplying 350 mA to 1.5 A LED strings in architectural lighting. IC Role / Device Role / Timing Role: Freewheeling diode in constant-current buck topology. Use Value: 150 °C Tj(max) allows operation in sealed enclosures up to 85 °C ambient without derating. | Use Scenario: 12 V auxiliary rail rectification in 300 W gaming console PSU with multi-phase control. IC Role / Device Role / Timing Role: High-current output rectifier subjected to repeated 200 A surge events during GPU load transients. Use Value: 240 A IFSM rating ensures survival of 10 ms surges without bond-wire fusing or thermal runaway. |
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-20CPH12 | TO-247 package; Rth(j-c) = 1.25 °C/W; VF = 0.65 V @ 20 A/125 °C | Higher thermal performance but larger footprint; requires through-hole assembly | Select when board space permits and heatsink interface demands lowest possible Rth(j-c). |
| ON Semiconductor MBR20120CT | TO-220AB dual-diode configuration; VF = 0.75 V @ 20 A/125 °C; no avalanche rating | Offers dual-channel option but higher VF and no surge resilience | Select only for cost-sensitive, non-surge-prone low-end adapters where dual cathode routing is needed. |
Compared with VS-20CPH12 and MBR20120CT, STPS20M120SR uniquely balances surface-mount compatibility, avalanche ruggedness, and sub-0.65 V VF at full load-making it optimal for compact, high-reliability 65–120 W adapter designs requiring regulatory surge immunity.
Availability
STPS20M120SR is available at Aetrix Electronics and suitable for notebook AC adapters, LED driver modules, and gaming console power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for STPS20M120SR 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 automotive, industrial, and consumer markets.
STPS20M120SR belongs to ST's high-efficiency power Schottky rectifier product line, engineered specifically for high-frequency, high-current DC/DC conversion in space-constrained, thermally demanding adapter and lighting applications.
FAQ
What is the maximum allowable case temperature for continuous operation?
The STPS20M120SR is rated for maximum junction temperature of 150 °C. With Rth(j-c) = 1.35 °C/W, sustained case temperature must remain ≤ 125 °C to maintain 25 °C margin for reliability. This requires minimum 10 cm² copper pour and forced airflow or heatsink for 20 A operation.
Is STPS20M120SR pin-compatible with TO-220AB variants like STPS20M120STN?
No-STPS20M120SR uses I²PAK (TO-263) surface-mount footprint, while STPS20M120STN uses TO-220AB narrow leads through-hole package. Pad layout, thermal pad requirements, and mechanical mounting differ significantly; PCB redesign is required for substitution.
Does this diode require a snubber circuit in high-frequency SMPS?
No snubber is required due to zero reverse recovery charge (Qrr ≈ 0 pC) and absence of minority carrier tail current. However, a small RC snubber (e.g., 10 Ω + 100 pF) may be added across anode–cathode if ringing occurs from parasitic inductance in high-dI/dt layouts above 300 kHz.
How does the avalanche rating impact system-level protection design?
The 1200 W avalanche power rating (10 µs pulse) allows the diode to absorb transient energy from inductive kickback or line surges without failure. This reduces need for external TVS diodes or MOVs in Class II adapter designs, simplifying BOM and improving surge immunity per IEC 61000-4-5 Level 3.
STPS20M120SR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-262-3 Long Leads, I2PAK, TO-262AA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 120 V
- Current - Average Rectified (Io):
- 20A
- Voltage - Forward (Vf) (Max) @ If:
- 840 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 275 µA @ 120 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- I2PAK
- Operating Temperature - Junction:
- 150°C (Max)
STPS20M120SR FAQ
1.How can I place an order for STPS20M120SR through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS20M120SR 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 STPS20M120SR reliable?
The price and inventory of STPS20M120SR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS20M120SR is usually 5 days.
3.What payment methods are accepted for STPS20M120SR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS20M120SR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS20M120SR?
STPS20M120SR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS20M120SR 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 STPS20M120SR?
For technical support, including STPS20M120SR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS20M120SR requirements.
6.How does Aetrix verify that STPS20M120SR is sourced from the original manufacturer or authorized distributors?
All STPS20M120SR 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 STPS20M120SR meets industry standards.
7.What is the process for return or replacement of STPS20M120SR?
All STPS20M120SR units undergo pre-shipment inspection (PSI). If there is an issue with STPS20M120SR, 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 STPS20M120SR part is unused and in its original packaging.
Return procedure for STPS20M120SR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS20M120SR Tags
-
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BAV21W-7-F
Diodes Incorporated
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