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

STMicroelectronics STP17NK40Z

Name: STP17NK40Z
Brand: STMicroelectronics
SKU: STP17NK40Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STP17NK40Z

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: STP17NK40Z.pdf

Description:: MOSFET N-CH 400V 15A TO220AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STP17NK40ZFP from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET rated for 400 V drain-source voltage, 220 mΩ typical R_DS(on), and 15 A continuous drain current at T_C = 25 °C. It delivers high dv/dt immunity (4.5 V/ns), 100% avalanche tested ruggedness (E_AS = 450 mJ), and low gate charge (65 nC), making it suitable for hard-switched SMPS primary-side switching in industrial AC-DC converters.

For engineers reviewing the STP17NK40ZFP datasheet, STP17NK40ZFP pinout, STP17NK40ZFP application, or STP17NK40ZFP equivalent, key selection criteria include its TO-220FP package thermal resistance (R_thJC = 3.6 °C/W), Zener-protected gate (±30 V V_GS rating), and verified unclamped inductive switching capability under 15 A/320 V conditions.

Technical Context

This device implements ST's SuperMESH process - an evolution of PowerMESH - to simultaneously reduce R_DS(on) and intrinsic capacitance (C_iss = 1900 pF, C_oss = 271 pF) while maintaining high voltage blocking (V_(BR)DSS = 400 V) and robust ESD tolerance (4.5 kV HBM).

Its Zener-protected gate structure enables reliable operation with ±30 V gate drive, and its 100% avalanche testing ensures survivability during transient overvoltage events in flyback and resonant topologies where diode recovery stresses occur.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	400 V - Supports primary-side switching in universal-input (85–265 V_AC) offline SMPS up to 320 V DC bus.
R_DS(on) typ.	220 mΩ - Enables <1.7 W conduction loss at 15 A, reducing heatsink requirements in 100–300 W power supplies.
Q_g	65 nC - Low gate charge allows efficient driving with standard 1-A peak gate drivers at 100 kHz+ switching frequencies.
E_AS	450 mJ - Confirmed single-pulse avalanche energy supports unclamped inductive switching without failure in flyback snubberless designs.
dv/dt	4.5 V/ns - High noise immunity prevents false turn-on during fast voltage transients in high-side configurations.
R_thJC	3.6 °C/W - Enables 35 W dissipation with ≤125 °C junction rise above case, supporting compact heatsink integration in enclosed enclosures.

Pinout & Package

Supplied in TO-220FP (Type B) package: insulated plastic case with integral heatsink tab, 3-pin vertical mounting, lead-free and RoHS-compliant per ECOPACK® specifications.

Pin/Terminal	Circuit Role	Design Meaning
G (Pin 1)	Gate	Control terminal; accepts 0–10 V logic-level drive; Zener-clamped to ±30 V for ESD robustness.
D (Pin 2)	Drain	High-voltage output node; electrically isolated from heatsink via molded plastic body (V_ISO = 2.5 kV RMS).
S (Pin 3)	Source	Power return path; referenced to driver ground; source-drain diode supports synchronous rectification in secondary-side applications.

Key Features

Feature	Design Value
Zener-protected gate	Integrated bidirectional Zener clamp limits V_GS to ±30 V, eliminating need for external gate protection in noisy industrial environments.
100% avalanche tested	Every unit validated for E_AS ≥ 450 mJ at T_J = 25 °C, ensuring field reliability in unclamped inductive switching.
Extremely high dv/dt capability	Rated 4.5 V/ns with I_SD ≤ 15 A and di/dt ≤ 200 A/μs - suppresses parasitic turn-on in high-frequency half-bridge layouts.
Low intrinsic capacitance	C_iss = 1900 pF, C_oss = 271 pF - reduces switching losses and improves efficiency in 65–130 kHz SMPS designs.

Applications

Industrial AC-DC Adapters

LED Driver Primary Switch

Use Scenario: 150 W universal-input offline flyback converter powering factory automation sensors.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch controlling energy transfer during each PWM cycle.

Use Value: Avalanche ruggedness eliminates need for snubber networks, reducing BOM count and improving power density.

Use Scenario: Constant-current LED driver for street lighting operating from 220 V_AC mains.

IC Role / Device Role / Timing Role: Main switching element in quasi-resonant (QR) flyback topology regulating LED string current.

Use Value: Low Q_g (65 nC) and fast switching (t_d(off) = 55 ns) enable >90% efficiency at 100 kHz.

UPS Inverter Stage

Motor Drive Protection Switch

Use Scenario: DC-link switching stage in 500 VA line-interactive UPS converting battery DC to 230 V_AC.

IC Role / Device Role / Timing Role: High-side switch in half-bridge configuration handling 400 V DC bus and reactive loads.

Use Value: 2.5 kV insulation withstand voltage allows direct mounting to grounded heatsinks without isolation pads.

Use Scenario: Overcurrent protection switch in HVAC blower motor control module.

IC Role / Device Role / Timing Role: Fault-isolation MOSFET placed between DC bus and motor phase driver IC.

Use Value: Fast reverse recovery (t_rr = 332 ns) and low V_SD (1.6 V) minimize power loss during fault clearing.

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
STP16NF40	R_DS(on) = 280 mΩ (higher), Q_g = 55 nC (lower), no Zener gate protection	Lacks integrated gate Zener; requires external clamping for same ESD robustness	Prefer when gate drive is tightly controlled and cost sensitivity outweighs ruggedness needs
FQP4N40	R_DS(on) = 3.5 Ω (much higher), V_DS = 400 V, not avalanche tested	No guaranteed avalanche capability; unsuitable for unclamped inductive loads	Only acceptable in low-current (<2 A), low-stress linear or soft-switching roles

Compared with STP17NK40ZFP, STP16NF40 trades gate protection for marginally lower gate charge, while FQP4N40 lacks both avalanche rating and low R_DS(on), limiting it to non-critical, low-power switching where reliability under stress is not required.

Availability

STP17NK40ZFP is available at Aetrix Electronics and suitable for industrial AC-DC adapters, LED driver primary switches, and UPS inverter stages requiring stable component supply and long-term manufacturing continuity.

Supply support for STP17NK40ZFP 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.

STP17NK40ZFP belongs to the SuperMESH Power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline power conversion where avalanche hardness and dv/dt immunity are critical design constraints.

FAQ

Is STP17NK40ZFP pin-compatible with STP16NF40?

Yes - both use TO-220FP package with identical pinout (G-D-S). However, STP17NK40ZFP features Zener-protected gate and lower R_DS(on), enabling direct replacement only if gate drive circuitry accommodates ±30 V V_GS rating and thermal design accounts for higher power density.

What is the maximum safe operating temperature for continuous operation?

The device supports continuous operation up to T_J = 150 °C. With R_thJC = 3.6 °C/W and P_TOT = 35 W at T_C = 25 °C, junction temperature remains within limit if case temperature stays below 125 °C - achievable using ≥15 cm² aluminum heatsink with forced airflow.

Does STP17NK40ZFP require a gate resistor for stability?

A gate resistor (R_G = 4.7 Ω typical) is recommended to dampen ringing and control dV/dt during switching transitions. The datasheet specifies switching times (e.g., t_d(on) = 25 ns) using this value, and omitting it risks oscillation due to low C_iss/C_rss ratio and PCB layout parasitics.

Can STP17NK40ZFP be used in synchronous rectification?

No - it is an N-channel high-side switch optimized for primary-side hard switching, not low-side synchronous rectification. Its body diode has t_rr = 332 ns and V_SD = 1.6 V, which is too slow and lossy for secondary-side synchronous rectifier roles where sub-50 ns t_rr and <0.5 V V_SD are required.

STP17NK40Z Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 400 V

Current - Continuous Drain (Id) @ 25°C:: 15A (Tc)

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

Rds On (Max) @ Id, Vgs:: 250mOhm @ 7.5A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 100µA

Gate Charge (Qg) (Max) @ Vgs:: 65 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 1900 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 150W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

STP17NK40Z FAQ

1.How can I place an order for STP17NK40Z through Aetrix?

Please submit a Request for Quotation (RFQ) for STP17NK40Z 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 STP17NK40Z reliable?

The price and inventory of STP17NK40Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP17NK40Z is usually 5 days.

3.What payment methods are accepted for STP17NK40Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP17NK40Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STP17NK40Z?

STP17NK40Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STP17NK40Z 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 STP17NK40Z?

For technical support, including STP17NK40Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP17NK40Z requirements.

6.How does Aetrix verify that STP17NK40Z is sourced from the original manufacturer or authorized distributors?

All STP17NK40Z 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 STP17NK40Z meets industry standards.

7.What is the process for return or replacement of STP17NK40Z?

All STP17NK40Z units undergo pre-shipment inspection (PSI). If there is an issue with STP17NK40Z, 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 STP17NK40Z part is unused and in its original packaging.

Return procedure for STP17NK40Z:

1.Submit a request within 90 days.

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

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