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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

STMicroelectronics STPS20SM100SG-TR

Name: STPS20SM100SG-TR
Brand: STMicroelectronics
SKU: STPS20SM100SG-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPS20SM100SG-TR

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: STPS20SM100SG-TR.pdf

Description:: DIODE SCHOTTKY 100V 20A D2PAK

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Inventory:3,958

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Product details

Overview

STPS20SM100SG-TR from STMicroelectronics is a 100 V, 20 A average forward current Schottky rectifier in TO-220AB package, featuring 0.63 V typical forward voltage at 25 °C and 150 °C maximum junction temperature. It delivers low conduction loss and high-frequency switching capability for DC/DC converters and desktop power supplies.

For engineers reviewing the STPS20SM100SG-TR datasheet, STPS20SM100SG-TR pinout, STPS20SM100SG-TR application, or STPS20SM100SG-TR equivalent, key selection criteria include avalanche rating (1080 W), thermal resistance (1.3 °C/W junction-to-case), reverse leakage (≤30 µA at 25 °C), and ECOPACK®2 compliance for RoHS-constrained designs.

Technical Context

This device is a single-anode, single-cathode Schottky barrier diode optimized for high-efficiency switch-mode power conversion. Its low VF and fast recovery enable minimal switching losses in 100 kHz–1 MHz SMPS topologies.

Designed with metal–semiconductor junction architecture, it avoids minority-carrier storage delay and exhibits no reverse recovery charge (Qrr = 0). The TO-220AB package supports direct heatsink mounting via insulated washer or thermal pad, enabling stable operation up to 150 °C junction temperature under 20 A DC load.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	100 V - Maximum repetitive reverse blocking voltage; defines safe operating range in flyback/freewheeling paths
I_F(AV)	20 A - Average forward current at T_C = 125 °C; determines continuous power delivery capacity
V_F (typ.)	0.63 V @ 5 A, 25 °C - Low conduction loss reduces I²R heating and improves system efficiency
R_th(j-c)	1.3 °C/W - Enables predictable thermal design when mounted on heatsink with known interface resistance
I_FSM	350 A @ 10 ms - Withstands short-duration inrush currents during cold-start or fault conditions
T_j(max)	150 °C - Allows operation in thermally constrained environments without derating below full rated current
ECOPACK®2	Compliant - Meets EU RoHS Directive 2011/65/EU and halogen-free requirements for industrial and consumer applications

Pinout & Package

TO-220AB package with isolated tab (pin 2 = cathode, pins 1 & 3 shorted = anode). Metal tab serves as thermal path and electrical connection to cathode; requires insulating mounting hardware when cathode is not at chassis ground.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 & Pin 3 (shorted)	Anode	Primary current entry point; electrically common; must be connected to input rail or switching node
Pin 2 (Tab)	Cathode	Current exit path and primary thermal interface; electrically tied to output rail or ground return

Key Features

Feature	Design Value
Avalanche rated	1080 W peak power at 10 µs pulse - protects against inductive energy spikes without external snubbers
Low forward voltage	0.63 V typ. @ 5 A, 25 °C - reduces conduction loss by ~30% vs. standard silicon rectifiers at same current
High frequency operation	No Q_rr or reverse recovery time - eliminates switching loss component in hard-switched topologies
Thermal robustness	150 °C max junction temperature with 1.3 °C/W R_th(j-c) - supports compact heatsink designs in space-constrained adapters

Applications

Desktop Power Supply

LED Lighting Driver

Use Scenario: Secondary-side rectification in 100–300 W ATX or proprietary desktop PSUs operating at 100–500 kHz.

IC Role / Device Role / Timing Role: Freewheeling diode in synchronous or non-synchronous buck-derived topologies.

Use Value: 0.63 V V_F minimizes conduction loss at 20 A load, improving full-load efficiency by ≥1.2% over legacy 1N5822 alternatives.

Use Scenario: Output rectification in constant-current LED drivers for commercial downlights and panel lights.

IC Role / Device Role / Timing Role: High-reliability output diode handling 15–25 A pulsed DC with minimal thermal drift.

Use Value: 150 °C T_j(max) and 350 A I_FSM ensure stable operation during LED string hot-plug events and surge testing.

Game Console Adapter

Notebook AC Adapter

Use Scenario: Primary rectification in 65–120 W offline adapters powering gaming consoles with dynamic load profiles.

IC Role / Device Role / Timing Role: Input bridge or secondary-side synchronous rectifier replacement in quasi-resonant flyback designs.

Use Value: Avalanche rating enables direct replacement of less robust diodes without redesigning clamp circuitry.

Use Scenario: Output rectification in slim-profile 45–90 W notebook adapters requiring high power density.

IC Role / Device Role / Timing Role: Low-V_F freewheeling diode in multi-phase buck converters feeding CPU/GPU VRMs.

Use Value: TO-220AB package allows direct heatsink integration into ultra-thin adapter housings while maintaining 20 A DC capability.

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-20CPH05-M3	50 V V_RRM, 20 A I_F(AV), 0.52 V V_F typ. @ 10 A - lower voltage rating, slightly lower VF	Restricted to ≤50 V output rails; unsuitable for 100 V bus or universal-input SMPS	Select only for fixed 12–48 V systems where lower VF justifies reduced blocking margin
ON Semiconductor MBR20100CT	100 V V_RRM, dual-diode center-tap configuration, 1.05 V V_F typ. @ 10 A - higher VF, different pinout and thermal path	Requires PCB layout change; higher conduction loss increases thermal stress in same footprint	Use only if dual-output topology demands center-tap; otherwise avoid due to 66% higher conduction loss

Compared with VS-20CPH05-M3 and MBR20100CT, STPS20SM100SG-TR uniquely balances 100 V blocking, 0.63 V low VF, and TO-220AB thermal performance-making it optimal for universal-input, high-efficiency desktop and adapter designs where both voltage margin and thermal headroom are critical.

Availability

STPS20SM100SG-TR is available at Aetrix Electronics and suitable for desktop power supplies, LED lighting drivers, game console adapters, and notebook AC adapters requiring stable component supply across long production cycles.

Supply support for STPS20SM100SG-TR 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.

STPS20SM100SG-TR belongs to ST's high-current Schottky rectifier product line, engineered specifically for high-efficiency, high-reliability AC/DC and DC/DC conversion in compact power adapters and computing power supplies.

FAQ

Is STPS20SM100SG-TR pin-compatible with STPS20SM100S?

Yes - STPS20SM100SG-TR and STPS20SM100S share identical TO-220AB mechanical outline, pin assignment (anode on pins 1/3, cathode on tab/pin 2), and thermal interface. The "-TR" suffix denotes tape-and-reel packaging; electrical and thermal specifications are fully identical per DS6172 Rev 4.

What is the maximum recommended heatsink thermal resistance for 20 A continuous operation?

At 20 A I_F(AV) and ambient temperature of 50 °C, junction temperature reaches 150 °C when R_th(j-a) = 5.0 °C/W. Given R_th(j-c) = 1.3 °C/W, the heatsink-to-ambient resistance must be ≤3.7 °C/W, assuming 0.25 °C/W interface resistance from thermal paste and mounting hardware.

Does STPS20SM100SG-TR require a snubber circuit in flyback applications?

No - its 1080 W avalanche rating at 10 µs enables safe clamping of inductive energy without external snubbers in properly designed flyback converters. However, a small RC snubber may still be used to suppress high-frequency ringing caused by parasitic L-C resonance, independent of avalanche capability.

Can STPS20SM100SG-TR replace a standard PN-junction rectifier like 1N5408?

Only in low-voltage, high-frequency circuits where reverse recovery loss dominates. STPS20SM100SG-TR has 100 V V_RRM vs. 1N5408's 1000 V, so it cannot substitute in high-voltage line rectification. In secondary-side SMPS positions, its zero Q_rr and 0.63 V V_F provide superior efficiency and thermal performance over 1N5408's 1.1 V V_F and 2–4 µs t_rr.

STPS20SM100SG-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

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:: Surface Mount

Supplier Device Package:: D2PAK

Operating Temperature - Junction:: 150°C (Max)

STPS20SM100SG-TR FAQ

1.How can I place an order for STPS20SM100SG-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for STPS20SM100SG-TR 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 STPS20SM100SG-TR reliable?

The price and inventory of STPS20SM100SG-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPS20SM100SG-TR is usually 5 days.

3.What payment methods are accepted for STPS20SM100SG-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPS20SM100SG-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPS20SM100SG-TR?

STPS20SM100SG-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPS20SM100SG-TR 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 STPS20SM100SG-TR?

For technical support, including STPS20SM100SG-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPS20SM100SG-TR requirements.

6.How does Aetrix verify that STPS20SM100SG-TR is sourced from the original manufacturer or authorized distributors?

All STPS20SM100SG-TR 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 STPS20SM100SG-TR meets industry standards.

7.What is the process for return or replacement of STPS20SM100SG-TR?

All STPS20SM100SG-TR units undergo pre-shipment inspection (PSI). If there is an issue with STPS20SM100SG-TR, 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 STPS20SM100SG-TR part is unused and in its original packaging.

Return procedure for STPS20SM100SG-TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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