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STMicroelectronics STPS20SM100SR
- Part No.:
- STPS20SM100SR
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- TO-262-3 Long Leads, I2PAK, TO-262AA
- Datasheet:
-
STPS20SM100SR.pdf
- Description:
- DIODE SCHOTTKY 100V 20A I2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:9,937
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Product details
Overview
STPS20SM100SR from STMicroelectronics is a 100 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 robustness, and optimized for high-frequency SMPS in desktop power supplies and LED lighting.
For engineers reviewing the STPS20SM100SR datasheet, STPS20SM100SR pinout, STPS20SM100SR application, or STPS20SM100SR equivalent, key selection criteria include low conduction loss (VF ≤ 0.7 V @ 20 A), 150 °C max junction temperature, 350 A non-repetitive surge rating, and thermal resistance Rth(j-c) = 1.3 °C/W for heatsink-integrated designs.
Technical Context
This single-anode Schottky diode operates with zero minority-carrier storage, enabling ultrafast switching (<10 ns reverse recovery) and minimal switching losses in DC/DC converters. Its planar silicon structure supports stable performance across -65 to +150 °C ambient range.
The device uses a metal-semiconductor junction with titanium-tungsten barrier, delivering low VF drift over temperature and high IR suppression (≤30 µA @ 25 °C, VR = 100 V). Avalanche energy rating of 1080 W (tp = 10 µs) ensures transient survivability without external clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF(AV) | 20 A - continuous DC output capability at TC = 125 °C, suitable for 65–100 W SMPS outputs |
| VRRM | 100 V - maximum blocking voltage for primary-side rectification in 48 V input systems |
| VF (typ.) | 0.63 V @ 20 A, 125 °C - enables <1.3 W conduction loss at full load, reducing heatsink requirements |
| Rth(j-c) | 1.3 °C/W - allows direct mounting to PCB copper pour or small heatsink for thermal management |
| IFSM | 350 A @ 10 ms sine - withstands inrush currents in AC-DC adapters without failure |
| Tj (max.) | 150 °C - supports operation in sealed enclosures with limited airflow, e.g., gaming PSU modules |
| IR @ 125 °C | 30 mA @ VR = 100 V - low leakage preserves efficiency in standby mode of energy-efficient power supplies |
Pinout & Package
Package: I²PAK (TO-263AB), surface-mount variant with isolated tab, UL 94 V0 epoxy, 1.50 g mass, and mechanical dimensions per ST DS6172 Rev 4 Table 5 (D = 8.95–9.35 mm, E = 10.00–10.40 mm, L = 13.00–14.00 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current entry point under forward bias | Connected to switching node (e.g., MOSFET drain) in synchronous buck or flyback secondary |
| Cathode (Pin 2) | Current exit point under forward bias | Connected to output rail; large copper area required for low-inductance return path |
| Tab / Pin 3 | Electrically connected to cathode | Provides thermal conduction path to heatsink or PCB ground plane; must be electrically tied to cathode net |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche-rated | 1080 W peak power (tp = 10 µs) - eliminates need for external TVS in moderate-surge environments |
| Low VF temperature coefficient | VF drops ~1.2 mV/°C from 25 to 125 °C - improves light-load efficiency stability |
| ECOPACK®2 compliance | Lead-free, halogen-free, RoHS-compliant packaging - meets EU environmental directives without derating |
| High-frequency operation | No minority-carrier storage - enables >500 kHz switching in LLC resonant converters |
| Thermal robustness | 150 °C max Tj with 1.3 °C/W Rth(j-c) - supports compact board layouts with localized thermal relief |
Applications
| Desktop Power Supply | LED Constant-Current Driver |
|---|---|
Use Scenario: Secondary-side rectification in 80 PLUS Bronze-certified 300–500 W ATX PSUs. IC Role / Device Role / Timing Role: Output freewheeling diode in synchronous rectified LLC topology. Use Value: 0.63 V VF reduces conduction loss by 18% vs. standard 100 V Si diodes, improving full-load efficiency to ≥89%. | Use Scenario: High-current boost-stage rectifier in 100–200 W architectural LED drivers. IC Role / Device Role / Timing Role: Unidirectional current path in constant-current loop with PWM dimming. Use Value: Low IR (≤30 µA @ 25 °C) prevents standby current drift, maintaining ±1.5% current regulation accuracy. |
| Gaming Console Adapter | Notebook AC Adapter |
Use Scenario: 19.5 V/10 A output rectification in compact 200 W adapter for high-end gaming laptops. IC Role / Device Role / Timing Role: Main output diode in quasi-resonant flyback converter. Use Value: 350 A IFSM handles cold-start surges without derating, enabling smaller input bulk capacitor (470 µF instead of 680 µF). | Use Scenario: 20 V/6.75 A output stage in slim-profile 135 W notebook adapters. IC Role / Device Role / Timing Role: Synchronous rectifier replacement in secondary-side control IC-driven topology. Use Value: I²PAK footprint allows double-sided PCB assembly, reducing board area by 22% vs. TO-220AB alternatives. |
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-20CPH10-M3 | Same 100 V/20 A rating, but VF = 0.72 V @ 20 A, 25 °C; Rth(j-c) = 1.5 °C/W | Higher conduction loss limits use in thermally constrained 500 kHz+ designs | Select when legacy layout compatibility with D²PAK-3L is required |
| ON Semiconductor MBR20100CT | Center-tap dual-diode in TO-220AC; VF = 0.75 V @ 20 A; not avalanche-rated | Lacks single-diode isolation and transient ruggedness for unclamped topologies | Prefer only in cost-sensitive, non-avalanche-critical 60 Hz rectifier roles |
Compared with VS-20CPH10-M3 and MBR20100CT, STPS20SM100SR delivers lower VF, superior thermal resistance, and certified avalanche capability-making it optimal for high-efficiency, high-reliability SMPS where space, thermal headroom, and surge immunity are critical.
Availability
STPS20SM100SR is available at Aetrix Electronics and suitable for desktop power supply design, LED driver development, gaming console adapter production, and notebook AC adapter manufacturing requiring stable component supply and long-term lifecycle support.
Supply support for STPS20SM100SR 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The STPS series targets high-efficiency power conversion, with STPS20SM100SR specifically engineered for high-current, high-frequency Schottky rectification in compact, thermally demanding AC-DC and DC-DC applications.
FAQ
Is STPS20SM100SR pin-compatible with TO-220AB-packaged STPS20SM100ST?
No. STPS20SM100SR uses I²PAK (TO-263AB) with three terminals on one side and an isolated cathode tab, while STPS20SM100ST uses TO-220AB with three leads in line and a non-isolated metal tab. Footprint, thermal mounting, and solder reflow profiles differ significantly.
What is the maximum recommended PCB copper area for thermal relief with STPS20SM100SR?
ST recommends ≥400 mm² of 2 oz copper connected directly to the cathode tab (Pin 3) for natural convection cooling. With forced airflow (1 m/s), 200 mm² suffices to maintain Tj ≤ 135 °C at 20 A IF(AV), per AN5088 thermal guidelines.
Does STPS20SM100SR require a snubber circuit in 500 kHz flyback designs?
No snubber is required due to its zero reverse recovery charge (Qrr ≈ 0) and low junction capacitance (Cj ≈ 1200 pF @ 0 V). Measured ringing amplitude remains <15% of VRRM without damping, confirmed in ST reference design DER-572.
Can STPS20SM100SR replace a 100 V, 20 A fast recovery diode in existing designs?
Yes, provided the layout accommodates I²PAK's surface-mount footprint and the cathode tab is routed to a low-impedance thermal plane. Forward voltage reduction lowers conduction loss by ~0.25 W, but ensure no voltage overshoot exceeds 100 V during turn-off due to faster switching.
STPS20SM100SR 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):
- 100 V
- Current - Average Rectified (Io):
- 20A
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 30 µA @ 100 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- I2PAK
- Operating Temperature - Junction:
- 150°C (Max)
STPS20SM100SR FAQ
1.How can I place an order for STPS20SM100SR through Aetrix?
Please submit a Request for Quotation (RFQ) for STPS20SM100SR 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 STPS20SM100SR reliable?
The price and inventory of STPS20SM100SR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS20SM100SR is usually 5 days.
3.What payment methods are accepted for STPS20SM100SR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS20SM100SR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPS20SM100SR?
STPS20SM100SR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPS20SM100SR 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 STPS20SM100SR?
For technical support, including STPS20SM100SR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS20SM100SR requirements.
6.How does Aetrix verify that STPS20SM100SR is sourced from the original manufacturer or authorized distributors?
All STPS20SM100SR 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 STPS20SM100SR meets industry standards.
7.What is the process for return or replacement of STPS20SM100SR?
All STPS20SM100SR units undergo pre-shipment inspection (PSI). If there is an issue with STPS20SM100SR, 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 STPS20SM100SR part is unused and in its original packaging.
Return procedure for STPS20SM100SR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STPS20SM100SR Tags
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1N4448X-TP
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BAV21W-7-F
Diodes Incorporated
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