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

STMicroelectronics STD5N20T4

Name: STD5N20T4
Brand: STMicroelectronics
SKU: STD5N20T4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STD5N20T4

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: STD5N20T4.pdf

Description:: MOSFET N-CH 200V 5A DPAK

Quantity:: RFQ Add To RFQ list

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Inventory:9,472

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Product details

Overview

STD5N20T4 from STMicroelectronics is an N-channel 200 V, 5 A, 0.6 Ω (typ) DPAK MOSFET using MESH OVERLAY™ process, designed for high-speed switching in SMPS and DC-DC converters for telecom and lighting equipment. It features 100% avalanche tested ruggedness, 5 V/ns dv/dt capability, and 130 mJ single-pulse avalanche energy.

For engineers reviewing the STD5N20T4 datasheet, STD5N20T4 pinout, STD5N20T4 application, or STD5N20T4 equivalent, key selection criteria include R_DS(on) at 10 V gate drive, thermal resistance (R_thj-case = 2.77 °C/W), avalanche robustness, switching speed (t_d(on) = 18 ns), and TO-252 package compatibility with high-power PCB layouts.

Technical Context

This MOSFET employs ST's patented STrip layout and proprietary edge termination to enhance voltage handling and switching reliability. Its 200 V V_DSS, 0.7–0.8 Ω R_DS(on) at 10 V/2.5 A, and 19–27 nC total gate charge support efficient hard-switching in offline and isolated DC-DC topologies.

The integrated body diode delivers 6 A continuous source-drain current with 1.5 V forward voltage and 155 ns reverse recovery time at T_j = 150 °C - enabling synchronous rectification and freewheeling roles without external diodes in compact converters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	200 V - supports 170 V AC input rectified rails with margin for surge and ringing
R_DS(on)	0.7–0.8 Ω @ V_GS = 10 V, I_D = 2.5 A - enables <5 W conduction loss at 5 A continuous
I_D (cont)	5 A @ T_C = 25 °C - requires heatsinking above ~40 °C case temperature
E_AS	130 mJ - withstands unclamped inductive switching events without failure
Q_g	19–27 nC - determines gate driver power and switching transition time in 100–500 kHz designs
t_r/t_f	30 ns / 10 ns - supports fast turn-on/turn-off with minimal overlap loss in hard-switched converters
V_SD	1.5 V @ I_SD = 6 A - defines forward drop during synchronous rectification or freewheeling

Pinout & Package

Package: TO-252 (DPAK), surface-mount, single-ended heat dissipation via exposed drain pad. Thermal resistance R_thj-case = 2.77 °C/W enables 45 W power dissipation at 25 °C case temperature.

Pin/Terminal	Circuit Role	Design Meaning
1 (Gate)	Control terminal	Receives 10 V logic-level gate drive; threshold 2–4 V enables TTL/CMOS compatibility
2 (Source)	Reference node	Common return path for load current; ties to ground or low-side switch node
3 (Drain)	Power output	Connected to high-voltage rail or transformer secondary; electrically tied to exposed metal tab

Key Features

Feature	Design Value
MESH OVERLAY™ process	Enables 200 V rating with sub-0.8 Ω R_DS(on) in DPAK - improves power density vs planar HV MOSFETs
100% avalanche tested	Guarantees robustness under unclamped inductive switching - eliminates need for snubbers in many flyback designs
5 V/ns dv/dt capability	Prevents false turn-on during high-slew-rate transients - critical in high-frequency, high-noise SMPS
Integrated body diode	Supports bidirectional current flow with 155 ns t_rr - usable for freewheeling and synchronous rectification up to ~250 kHz

Applications

LED Driver Power Stage

Industrial DC-DC Converter

Use Scenario: Constant-current LED driver for street lighting using flyback topology with primary-side regulation.

IC Role / Device Role / Timing Role: High-side main switch controlling energy transfer into transformer primary.

Use Value: 130 mJ E_AS handles leakage inductance spikes; 0.8 Ω R_DS(on) limits conduction loss at 5 A peak.

Use Scenario: 48 V input to 12 V/10 A isolated DC-DC converter for factory automation controllers.

IC Role / Device Role / Timing Role: Primary-side switching transistor in forward or half-bridge configuration.

Use Value: 200 V rating accommodates 48 V bus with 150 % overvoltage margin; 27 nC Q_g enables efficient 300 kHz operation.

Telecom AC-DC Adapter

High-Voltage Buck Converter

Use Scenario: Universal-input (90–264 V AC) 65 W adapter for telecom base station modules.

IC Role / Device Role / Timing Role: Main switch in quasi-resonant flyback controller stage.

Use Value: 5 V/ns dv/dt immunity prevents spurious turn-on during ZVS transitions; 150 °C T_jmax supports sealed enclosure operation.

Use Scenario: 300 V DC input buck converter for PoE++ powered devices requiring 54 V output.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier or high-side switch in non-isolated step-down stage.

Use Value: Integrated 1.5 V body diode reduces external component count; 6 A I_SD supports peak currents in transient load steps.

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
STP5N20	TO-220 package, identical electrical specs, higher R_thj-amb (62.5 °C/W vs 100 °C/W)	Better natural convection cooling; unsuitable for space-constrained SMT layouts	Select when board-level heatsinking is impractical but chassis mounting is available
IRF640NPBF	200 V, 18 A, 0.18 Ω R_DS(on), TO-220, higher gate charge (71 nC)	Lower conduction loss at >3 A, but slower switching and larger footprint	Prefer for lower-frequency (<100 kHz), high-current linear-regulator replacement use cases

Compared with STP5N20 and IRF640NPBF, STD5N20T4 offers optimal balance of SMT manufacturability, 0.8 Ω on-resistance, and 27 nC gate charge - making it best suited for compact, medium-power, high-frequency SMPS where thermal interface design is controlled.

Availability

STD5N20T4 is available at Aetrix Electronics and suitable for LED drivers, industrial DC-DC converters, and telecom AC-DC adapters requiring stable component supply and tape-and-reel delivery for automated assembly.

Supply support for STD5N20T4 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, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

STD5N20T4 belongs to ST's MESH OVERLAY™ power MOSFET family, engineered specifically for high-efficiency, high-reliability switching in lighting, telecom, and industrial power supplies.

FAQ

What is the maximum continuous drain current at 100 °C case temperature?

The STD5N20T4 supports 3.5 A continuous drain current at T_C = 100 °C, per its absolute maximum ratings table. This derating reflects thermal limitations of the DPAK package and must be verified against actual PCB copper area and ambient conditions in the final layout.

Does this MOSFET require a gate resistor for safe operation?

Yes - a gate resistor (typically 4.7 Ω, as used in datasheet switching tests) is required to control dV/dt and prevent oscillation. Without it, excessive ringing and shoot-through risk occur due to interaction between gate charge (27 nC) and PCB parasitics.

Can STD5N20T4 replace STD3NK20Z in a 24 V input buck converter?

No - STD3NK20Z is a 200 V, 3 A, 1.2 Ω device with different gate threshold and SO-8 packaging. STD5N20T4's higher current (5 A) and lower R_DS(on) (0.8 Ω) improve efficiency but require revalidation of gate drive strength and thermal layout due to increased power density.

Is the body diode suitable for synchronous rectification?

Yes - the body diode has 6 A continuous current rating and 155 ns reverse recovery time at 150 °C, making it viable for synchronous rectification in ≤250 kHz non-isolated buck or flyback topologies, provided gate timing avoids cross-conduction.

STD5N20T4 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: MESH OVERLAY™

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 200 V

Current - Continuous Drain (Id) @ 25°C:: 5A (Tc)

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

Rds On (Max) @ Id, Vgs:: 800mOhm @ 2.5A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 27 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 350 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 45W (Tc)

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

STD5N20T4 FAQ

1.How can I place an order for STD5N20T4 through Aetrix?

Please submit a Request for Quotation (RFQ) for STD5N20T4 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 STD5N20T4 reliable?

The price and inventory of STD5N20T4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD5N20T4 is usually 5 days.

3.What payment methods are accepted for STD5N20T4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD5N20T4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STD5N20T4?

STD5N20T4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STD5N20T4 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 STD5N20T4?

For technical support, including STD5N20T4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD5N20T4 requirements.

6.How does Aetrix verify that STD5N20T4 is sourced from the original manufacturer or authorized distributors?

All STD5N20T4 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 STD5N20T4 meets industry standards.

7.What is the process for return or replacement of STD5N20T4?

All STD5N20T4 units undergo pre-shipment inspection (PSI). If there is an issue with STD5N20T4, 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 STD5N20T4 part is unused and in its original packaging.

Return procedure for STD5N20T4:

1.Submit a request within 90 days.

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

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