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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

STMicroelectronics STP20N20

Name: STP20N20
Brand: STMicroelectronics
SKU: STP20N20
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STP20N20

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: STP20N20.pdf

Description:: MOSFET N-CH 200V 18A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:2,530

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Product details

Overview

STP20N20 from STMicroelectronics is an N-channel enhancement-mode power MOSFET in TO-220 package, rated for 200 V V_DSS, 18 A continuous drain current, and typical R_DS(on) of 0.10 Ω at V_GS = 10 V. It features low gate charge (Q_g = 45 nC), 100% avalanche tested, and is optimized as a primary-side switch in isolated DC-DC converters.

For engineers reviewing the STP20N20 datasheet, STP20N20 pinout, STP20N20 application, or STP20N20 equivalent, key selection criteria include its 200 V blocking voltage, 0.10 Ω on-resistance at 10 V gate drive, TO-220 thermal performance, avalanche ruggedness, and suitability for high-efficiency flyback and forward converter topologies.

Technical Context

This MOSFET employs ST's proprietary STripFET™ II process to minimize input capacitance (C_iss = 1200 pF) and total gate charge (Q_g = 45 nC), enabling fast switching with reduced driver loss. Its 100% unclamped inductive switching (UIS) rating supports robust operation under transient overloads.

The device exhibits exceptional dv/dt immunity (>4.5 V/ns) and is characterized for operation up to T_j = 175 °C. Its SOA is specified for both linear-mode and pulse conditions, supporting reliable use in hard-switched primary-side applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	200 V - Maximum drain-source blocking voltage; supports 110–230 VAC input-derived bus voltages with margin.
R_DS(on) max	0.125 Ω @ V_GS = 10 V - Ensures <1.5 W conduction loss at 18 A, critical for thermal management in compact converters.
I_D continuous	18 A @ T_c = 25 °C - Rated for high-current primary switching with TO-220 heatsink interface.
Q_g	45 nC - Low gate charge reduces driver power and enables efficient 100–500 kHz switching in SMPS designs.
E_AS	320 mJ @ T_j = 25 °C - Avalanche energy rating validates ruggedness during inductive turn-off transients.
C_iss	1200 pF @ V_DS = 25 V - Low input capacitance minimizes Miller effect and improves gate drive efficiency.

Pinout & Package

STP20N20 uses a standard TO-220 package with three leads: Gate (pin 1), Drain (pin 2, tab-connected), Source (pin 3). The metal tab is electrically connected to the drain and serves as the primary thermal path.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (G)	Gate	Control terminal; requires 10 V drive for full enhancement; low Q_g enables fast turn-on/turn-off.
Pin 2 (D)	Drain	Main high-side switching node; internally bonded to metal tab for thermal and electrical connection to heatsink.
Pin 3 (S)	Source	Power return reference; forms common node with gate driver ground in non-isolated gate drive configurations.

Key Features

Feature	Design Value
STripFET™ II process	Reduces C_iss and Q_g by >25% vs. prior-generation planar MOSFETs, improving switching efficiency.
100% avalanche tested	Each unit validated for UIS capability, eliminating need for external snubbers in many flyback designs.
High dv/dt immunity	Rated >4.5 V/ns - suppresses false turn-on in high-noise, high-frequency converter environments.
TO-220 package	Standard footprint with 1.5 K/W junction-to-case thermal resistance, compatible with legacy heatsink tooling.

Applications

Server Power Supply

Industrial AC-DC Adapter

Use Scenario: Primary-side switch in 300–500 W active-clamp forward converter powering server motherboards.

IC Role / Device Role / Timing Role: High-voltage, high-current main power switch operating at 200–300 kHz with synchronous rectification control.

Use Value: Low R_DS(on) and Q_g reduce conduction and switching losses, enabling >92% efficiency at full load.

Use Scenario: Main switch in 150–250 W universal-input flyback supply for PLC I/O modules.

IC Role / Device Role / Timing Role: Isolated primary-side switching element handling 265 VAC peak line transients.

Use Value: 100% avalanche rating eliminates need for external clamping, reducing BOM count and layout area.

Telecom DC-DC Brick

LED Driver Power Stage

Use Scenario: Primary switch in 1/4-brick isolated DC-DC module converting –48 V input to 12 V output.

IC Role / Device Role / Timing Role: High-reliability power switch operating in hard-switched forward topology with tight thermal constraints.

Use Value: TO-220 package provides proven thermal path to baseplate, supporting 70 °C ambient operation without derating.

Use Scenario: High-side switch in constant-current LED driver for street lighting (230 VAC input).

IC Role / Device Role / Timing Role: Primary switching transistor in quasi-resonant flyback controlling 10–20 A LED strings.

Use Value: Exceptional dv/dt immunity prevents spurious turn-on during zero-crossing noise, ensuring stable dimming.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel 200 V power MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRFP260N	R_DS(on) = 0.04 Ω (lower), Q_g = 143 nC (higher), TO-247 package	Higher conduction efficiency but slower switching; requires larger gate driver	Prefer when conduction loss dominates and board space allows TO-247 heatsinking
STP16NF20	R_DS(on) = 0.14 Ω (higher), Q_g = 32 nC (lower), same TO-220 package	Lower gate drive demand but higher conduction loss at >12 A	Prefer when gate drive is constrained and peak current ≤14 A

Compared with IRFP260N and STP16NF20, STP20N20 delivers optimal balance of low R_DS(on), moderate Q_g, and TO-220 compatibility-making it ideal for cost-sensitive, thermally constrained 150–300 W isolated converters where both switching and conduction losses matter.

Availability

STP20N20 is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC adapters, and telecom DC-DC bricks requiring stable component supply and long-term manufacturing continuity.

Supply support for STP20N20 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The STPxxNxx series belongs to ST's high-voltage power MOSFET product line, engineered specifically for high-efficiency, high-reliability primary-side switching in isolated SMPS topologies.

FAQ

What is the maximum safe operating junction temperature for STP20N20?

The absolute maximum junction temperature is 175 °C per the datasheet. Derating begins above 125 °C case temperature, and sustained operation above 150 °C requires careful thermal design using the specified TO-220 thermal resistance (R_θJC = 1.5 K/W) and heatsink interface.

Is STP20N20 suitable for use in synchronous rectification circuits?

No-STP20N20 is an N-channel high-side switch intended for primary-side use. Its body diode reverse recovery characteristics and lack of optimized low-V_GS(th) make it unsuitable as a secondary-side synchronous rectifier; dedicated low-V_F, low-Q_rr MOSFETs like STP16LN60 are recommended instead.

Does STP20N20 require a gate resistor for stability in hard-switched applications?

Yes-a gate resistor (typically 10–47 Ω) is required to dampen ringing caused by PCB trace inductance interacting with C_iss and C_rss. Without it, overshoot and oscillation can exceed V_GS absolute maximum (±20 V) and cause premature failure.

Can STP20N20 be used in linear mode (e.g., as a pass transistor)?

It is not recommended. While the SOA curve includes limited linear-mode capability, its R_DS(on) and thermal resistance make it inefficient for sustained linear operation. Dedicated pass transistors or LDO controllers provide better regulation, accuracy, and thermal safety.

STP20N20 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™ II

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 200 V

Current - Continuous Drain (Id) @ 25°C:: 18A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 125mOhm @ 10A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 39 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 940 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 90W (Tc)

Operating Temperature:: -50°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

STP20N20 FAQ

1.How can I place an order for STP20N20 through Aetrix?

Please submit a Request for Quotation (RFQ) for STP20N20 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 STP20N20 reliable?

The price and inventory of STP20N20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP20N20 is usually 5 days.

3.What payment methods are accepted for STP20N20?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP20N20 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STP20N20?

STP20N20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STP20N20 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 STP20N20?

For technical support, including STP20N20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP20N20 requirements.

6.How does Aetrix verify that STP20N20 is sourced from the original manufacturer or authorized distributors?

All STP20N20 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 STP20N20 meets industry standards.

7.What is the process for return or replacement of STP20N20?

All STP20N20 units undergo pre-shipment inspection (PSI). If there is an issue with STP20N20, 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 STP20N20 part is unused and in its original packaging.

Return procedure for STP20N20:

1.Submit a request within 90 days.

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

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