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

STMicroelectronics STP11NK40Z

Name: STP11NK40Z
Brand: STMicroelectronics
SKU: STP11NK40Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STP11NK40Z

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: STP11NK40Z.pdf

Description:: MOSFET N-CH 400V 9A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:1,003

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Product details

Overview

STP11NK40Z from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 400 V drain-source voltage, 0.47 Ω typical R_DS(on) at V_GS = 10 V and I_D = 4.5 A, and 9 A continuous drain current at T_C = 25 °C. It is housed in a TO-220 package and designed for high-voltage switching applications requiring robust avalanche capability and high dv/dt immunity.

For engineers reviewing the STP11NK40Z datasheet, STP11NK40Z pinout, STP11NK40Z application, or STP11NK40Z equivalent, this device is selected for its 100% tested avalanche performance, minimized gate charge (32 nC), low output capacitance (140 pF), Zener-protected gate, and suitability in offline SMPS, motor drives, and industrial AC switchers where ruggedness and fast switching are critical.

Technical Context

This MOSFET employs ST's SuperMESH process - an evolution of PowerMESH - to reduce on-resistance while maintaining high breakdown voltage and superior dv/dt immunity (4.5 V/ns). Its intrinsic Zener diode across gate-source provides ESD protection up to 3.5 kV HBM and prevents gate oxide damage during transient events.

The device features low dynamic parameters: 30 pF reverse transfer capacitance (Crss), 190 mJ single-pulse avalanche energy, and fast switching with 20 ns turn-on delay and 17 ns fall time under standard test conditions (V_DD = 200 V, R_G = 4.7 Ω). Its source-drain diode supports 9 A continuous and 36 A pulsed conduction with 225 ns reverse recovery time.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	400 V - Supports direct connection to 230 VAC mains after rectification without derating.
R_DS(on) max	0.55 Ω - Limits conduction loss to ≤22 W at 9 A, enabling efficient thermal design in TO-220.
I_D cont. @ T_C=25°C	9 A - Enables use in 100–200 W power stages with adequate heatsinking.
Q_g	32 nC - Reduces gate drive power and enables use with low-current drivers (e.g., UC384x series).
E_AS	190 mJ - Withstands unclamped inductive switching events common in relay/motor control without failure.
dv/dt rating	4.5 V/ns - Ensures reliable operation in noisy high-dv/dt environments like phase-cut dimmers or PFC circuits.
C_oss	140 pF - Low output capacitance improves efficiency in hard-switched topologies and reduces switching loss.

Pinout & Package

STP11NK40Z uses the TO-220 type A package (standard through-hole mounting, insulated tab). The case serves as the Drain terminal, enabling direct heatsink attachment with electrical isolation.

Pin/Terminal	Circuit Role	Design Meaning
1 (Left)	Gate (G)	Control input; requires 10 V for full enhancement; Zener-clamped to ±30 V maximum.
2 (Middle)	Drain (D)	High-side switch node; connected to heatsink via metal tab; electrically active in TO-220.
3 (Right)	Source (S)	Power return path; referenced to system ground in low-side configurations; carries full load current.

Key Features

Feature	Design Value
100% avalanche tested	Guarantees minimum 190 mJ single-pulse energy handling - eliminates need for external snubbers in inductive loads.
Zener-protected gate	Integrated 30 V bidirectional Zener clamps gate-source voltage, removing requirement for external TVS in most designs.
SuperMESH technology	Reduces R_DS(on) by ~20% vs legacy PowerMESH while preserving 400 V rating and ruggedness.
Low Crss (30 pF)	Minimizes Miller effect, improving noise immunity and enabling stable operation with high-side gate drivers.
Fast diode recovery (225 ns)	Reduces switching losses in synchronous rectification and flyback converters operating above 65 kHz.

Applications

Offline SMPS

AC Motor Control

Use Scenario: Primary-side switch in 100–150 W universal-input flyback converters for industrial power supplies.

IC Role / Device Role / Timing Role: High-voltage switching element driven by UC3844/UC3845 PWM controller at 65–100 kHz.

Use Value: 0.47 Ω R_DS(on) and 32 nC Q_g enable >85% efficiency at full load; 4.5 V/ns dv/dt rating prevents false triggering during line transients.

Use Scenario: Phase-leg switch in 3-phase inverter driving 0.5–1 kW induction motors in HVAC blowers.

IC Role / Device Role / Timing Role: Low-side power switch controlled by isolated gate driver (e.g., Si8233) with 100 ns propagation delay.

Use Value: 100% avalanche rating ensures survival during motor stall or short-circuit events; 9 A continuous current supports 750 W mechanical output per phase.

Lighting Ballasts

Industrial Relay Replacement

Use Scenario: Half-bridge switch in electronic CFL ballasts operating from 230 VAC rectified input.

IC Role / Device Role / Timing Role: Fast-switching power transistor in resonant LC tank, gated at 30–50 kHz.

Use Value: Low C_oss (140 pF) and Crss (30 pF) minimize dead-time losses; Zener protection avoids gate failure during lamp ignition spikes.

Use Scenario: Solid-state replacement for electromechanical relays controlling 240 VAC resistive heating elements in PLC I/O modules.

IC Role / Device Role / Timing Role: Zero-crossing–triggered AC switch using optocoupler + snubberless triac driver topology.

Use Value: 400 V V_DS withstands 1.5× peak mains voltage; 190 mJ E_AS absorbs surge energy from inductive coil de-energization.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage N-channel MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP10NK40Z	Lower ID (8 A), higher R_DS(on) (0.60 Ω typ.), same 400 V rating and SuperMESH process.	Suitable for <100 W designs where thermal margin is constrained; reduced current handling limits peak power capability.	Select when lower cost and proven field reliability outweigh marginal current reduction.
FQP4N40	400 V rating, but 4 A ID, 3.5 Ω R_DS(on), no avalanche rating or Zener protection; older planar process.	Limited to low-power, non-critical applications; requires external gate protection and snubbing.	Choose only for cost-sensitive, low-stress DC-DC converters where ruggedness is not required.

Compared with STP10NK40Z, STP11NK40Z delivers +12.5% current headroom and 7% lower conduction loss; versus FQP4N40, it offers 2.25× higher current, 7× lower R_DS(on), and certified avalanche robustness - making it the preferred choice for industrial-grade switching.

Availability

STP11NK40Z is available at Aetrix Electronics and suitable for offline SMPS, AC motor control, lighting ballasts, and industrial relay replacement requiring stable component supply and long-term manufacturability.

Supply support for STP11NK40Z 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, specializing in power management, microcontrollers, sensors, and automotive ICs.

STP11NK40Z belongs to the SuperMESH Power MOSFET product line, engineered specifically for high-reliability, high-voltage switching in industrial, appliance, and lighting applications demanding avalanche ruggedness and gate protection.

FAQ

Is STP11NK40Z pin-compatible with STP10NK40Z?

Yes - both use identical TO-220 type A packaging with Gate-Drain-Source pinout (1-2-3). Mechanical footprint, thermal pad layout, and PCB land pattern are fully interchangeable. No board redesign is needed when upgrading from STP10NK40Z to STP11NK40Z for higher current capability.

Does STP11NK40Z require a gate resistor for safe operation?

A gate resistor (typically 10–47 Ω) is recommended to dampen ringing and limit peak gate current during switching. While the device's 32 nC total gate charge allows fast turn-on, omitting the resistor may cause oscillation due to PCB trace inductance interacting with low Crss (30 pF), risking shoot-through in half-bridge configurations.

Can STP11NK40Z be used in avalanche mode continuously?

No - avalanche operation is rated for single-pulse energy only (190 mJ). Continuous avalanche would exceed junction temperature limits and cause thermal runaway. The device is designed for *unclamped inductive switching* fault tolerance, not sustained avalanche conduction; proper SOA design and snubber use remain essential.

What is the maximum PCB copper area needed for 9 A continuous operation at 70°C ambient?

With a standard 1-inch² FR-4 board using 2-oz copper, R_thJA = 62.5 °C/W. To maintain T_J ≤ 125°C at 70°C ambient, allowable power dissipation is 0.88 W. At 9 A and 0.55 Ω, conduction loss is 44.6 W - thus forced-air cooling or a heatsink (R_thJC = 4.17 °C/W) is mandatory; PCB alone cannot sustain 9 A continuously.

STP11NK40Z Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 400 V

Current - Continuous Drain (Id) @ 25°C:: 9A (Tc)

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

Rds On (Max) @ Id, Vgs:: 550mOhm @ 4.5A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 100µA

Gate Charge (Qg) (Max) @ Vgs:: 32 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 930 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 110W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

STP11NK40Z FAQ

1.How can I place an order for STP11NK40Z through Aetrix?

Please submit a Request for Quotation (RFQ) for STP11NK40Z 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 STP11NK40Z reliable?

The price and inventory of STP11NK40Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP11NK40Z is usually 5 days.

3.What payment methods are accepted for STP11NK40Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP11NK40Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STP11NK40Z?

STP11NK40Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STP11NK40Z 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 STP11NK40Z?

For technical support, including STP11NK40Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP11NK40Z requirements.

6.How does Aetrix verify that STP11NK40Z is sourced from the original manufacturer or authorized distributors?

All STP11NK40Z 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 STP11NK40Z meets industry standards.

7.What is the process for return or replacement of STP11NK40Z?

All STP11NK40Z units undergo pre-shipment inspection (PSI). If there is an issue with STP11NK40Z, 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 STP11NK40Z part is unused and in its original packaging.

Return procedure for STP11NK40Z:

1.Submit a request within 90 days.

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

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