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

STMicroelectronics STP7NK40ZFP

Name: STP7NK40ZFP
Brand: STMicroelectronics
SKU: STP7NK40ZFP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STP7NK40ZFP

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3 Full Pack

Datasheet:: STP7NK40ZFP.pdf

Description:: MOSFET N-CH 400V 5.4A TO220FP

Quantity:: RFQ Add To RFQ list

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Inventory:9,051

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Product details

Overview

STP7NK40ZFP from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET in DPAK (TO-252) package, rated for 400 V drain-source voltage, 0.85 Ω typical R_DS(on), and 5.4 A continuous drain current at T_C = 25 °C. It delivers high dv/dt capability and 100% avalanche-tested ruggedness for offline switching power supplies.

For engineers reviewing the STP7NK40ZFP datasheet, STP7NK40ZFP pinout, STP7NK40ZFP application, or STP7NK40ZFP equivalent, key selection criteria include its 130 mJ single-pulse avalanche energy, 19 nC total gate charge, 535 pF input capacitance, Zener-protected gate, and DPAK thermal resistance of 1.78 °C/W junction-to-case.

Technical Context

This device implements ST's SuperMESH process - an evolution of PowerMESH - to reduce on-resistance while maintaining high voltage robustness and fast switching. Its Zener-protected gate structure enables ±30 V gate-source rating and intrinsic ESD immunity (3 kV HBM).

The MOSFET exhibits 4.5 V/ns peak diode recovery dv/dt capability under defined conditions (I_SD ≤ 5.4 A, di/dt ≤ 200 A/μs), and its source-drain diode features 220 ns reverse recovery time and 990 nC Q_rr at T_J = 150 °C, supporting hard-switched flyback and SMPS topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	400 V - supports universal-input offline AC-DC converters up to 265 V_AC with margin
R_DS(on) typ.	0.85 Ω @ V_GS = 10 V, I_D = 2.7 A - enables low conduction loss in 5–15 W SMPS designs
I_D cont. (T_C = 25 °C)	5.4 A - defines maximum continuous output current in thermally managed PCB layouts
E_AS	130 mJ - ensures reliable unclamped inductive switching in flyback snubberless operation
Q_g	19 nC - determines gate drive power requirement and switching speed trade-off
C_iss	535 pF - impacts high-frequency gate drive loop stability and EMI filtering design
R_thJC	1.78 °C/W - enables 70 W power dissipation with modest heatsinking on DPAK tab

Pinout & Package

STP7NK40ZFP uses the DPAK (TO-252) surface-mount package with exposed drain tab for thermal and electrical connection. The package complies with ECOPACK environmental specifications and is supplied in tape-and-reel format (2500 pcs/reel).

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control terminal; Zener-clamped to ±30 V; requires <19 nC charge for full enhancement
2 (D / TAB)	Drain / Thermal Pad	Main high-voltage power path and primary thermal interface; electrically connected to metal tab
3 (S)	Source	Power return and reference node for gate drive; forms source-drain body diode anode

Key Features

Feature	Design Value
100% avalanche tested	Guarantees minimum 130 mJ single-pulse energy handling without degradation
Zener-protected gate	Integrates gate-source Zener clamp enabling ±30 V rating and 3 kV HBM ESD tolerance
Minimized gate charge	19 nC total Q_g reduces driver losses and improves efficiency in 65–130 kHz SMPS
Very low intrinsic capacitance	535 pF C_iss, 82 pF C_oss - lowers switching losses and eases EMI filter design
High dv/dt capability	4.5 V/ns peak diode recovery slope - sustains reliability in fast-recovery flyback transitions

Applications

Offline AC-DC Adapters

Flyback SMPS

Use Scenario: 5–12 W universal-input wall adapters powering IoT sensors and USB peripherals.

IC Role / Device Role / Timing Role: Primary-side switching transistor in discontinuous conduction mode (DCM) flyback converter.

Use Value: 0.85 Ω R_DS(on) and 130 mJ E_AS enable compact, no-snubber designs meeting CoC Tier 2 efficiency requirements.

Use Scenario: Isolated 15–25 W industrial control power supplies with wide input range.

IC Role / Device Role / Timing Role: Main power switch in quasi-resonant (QR) flyback operating up to 130 kHz.

Use Value: 4.5 V/ns dv/dt capability and 220 ns t_rr support stable QR operation without secondary-side snubbing.

LED Driver Power Stages

Industrial Motor Control Inputs

Use Scenario: Constant-voltage LED drivers for signage and architectural lighting.

IC Role / Device Role / Timing Role: High-side switch in buck-derived constant-current regulator stage.

Use Value: Zener-protected gate withstands transient coupling from long LED strings; 5.4 A I_D supports >300 mA output at 400 V bus.

Use Scenario: Input stage of 24–48 V DC-fed brushless motor controllers.

IC Role / Device Role / Timing Role: Bulk capacitor charging switch and overvoltage clamping element.

Use Value: 400 V V_DS rating provides margin against back-EMF spikes; 1.78 °C/W R_thJC allows direct tab mounting to chassis ground.

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
STP7NK40Z	Same die, but in TO-220 package - higher R_thJA (62 °C/W vs 50 °C/W), no exposed drain tab	Requires through-hole PCB layout and larger heatsink; unsuitable for space-constrained SMT designs	Select STP7NK40ZFP when board area and thermal performance demand DPAK surface-mount integration
FQP4N40	400 V, 3.5 A, 2.4 Ω R_DS(on), no Zener gate protection, lower E_AS (60 mJ)	Lacks avalanche ruggedness and gate ESD hardening - requires external gate protection and snubbers	Choose STP7NK40ZFP where system-level reliability under overload or line surge is mandatory

Compared with STP7NK40Z and FQP4N40, STP7NK40ZFP uniquely combines DPAK thermal efficiency, integrated Zener gate protection, and 130 mJ avalanche energy - making it optimal for compact, high-reliability offline power stages where layout space and surge immunity are critical.

Availability

STP7NK40ZFP is available at Aetrix Electronics and suitable for offline AC-DC adapters, flyback SMPS, and industrial LED driver power stages requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for STP7NK40ZFP 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

STP7NK40ZFP belongs to ST's SuperMESH Power MOSFET product line - engineered specifically for high-efficiency, high-reliability offline switching applications demanding ruggedness, low gate charge, and tight parametric distribution.

FAQ

What is the maximum safe operating temperature for STP7NK40ZFP?

The device has a specified operating junction temperature range of –55 °C to 150 °C. Maximum continuous operation occurs at T_J ≤ 150 °C, enforced by thermal design using its 1.78 °C/W R_thJC and proper PCB copper area under the drain tab. Derating is required above T_C = 100 °C, where I_D drops to 3.4 A.

Does STP7NK40ZFP require external gate protection?

No - STP7NK40ZFP integrates a gate-source Zener diode, enabling a ±30 V absolute maximum gate-source voltage rating and 3 kV HBM ESD immunity. External gate protection is unnecessary unless subjected to >30 V transients beyond datasheet limits or extreme board-level ESD events exceeding HBM classification.

How does STP7NK40ZFP compare to STD7NK40ZT4?

STP7NK40ZFP and STD7NK40ZT4 share identical electrical specs and SuperMESH die, but differ in packaging: STP7NK40ZFP uses DPAK (TO-252) type E, while STD7NK40ZT4 uses DPAK type A. Type E offers slightly improved mechanical robustness and footprint compatibility per Figure 22 in DS2855 Rev 5, with identical thermal and electrical behavior.

Can STP7NK40ZFP be used in synchronous rectification?

No - STP7NK40ZFP is a standard-threshold N-channel MOSFET (V_GS(th) = 3.0–4.5 V) optimized for primary-side switching, not low-V_DS synchronous rectification. Its body diode recovery characteristics (220 ns t_rr, 990 nC Q_rr) are not optimized for secondary-side zero-voltage switching; dedicated logic-level SR MOSFETs are recommended instead.

STP7NK40ZFP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

Package/Case:: TO-220-3 Full Pack

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:: 5.4A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1Ohm @ 2.7A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 50µA

Gate Charge (Qg) (Max) @ Vgs:: 26 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 535 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 25W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

STP7NK40ZFP FAQ

1.How can I place an order for STP7NK40ZFP through Aetrix?

Please submit a Request for Quotation (RFQ) for STP7NK40ZFP 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 STP7NK40ZFP reliable?

The price and inventory of STP7NK40ZFP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP7NK40ZFP is usually 5 days.

3.What payment methods are accepted for STP7NK40ZFP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP7NK40ZFP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STP7NK40ZFP?

STP7NK40ZFP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STP7NK40ZFP 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 STP7NK40ZFP?

For technical support, including STP7NK40ZFP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP7NK40ZFP requirements.

6.How does Aetrix verify that STP7NK40ZFP is sourced from the original manufacturer or authorized distributors?

All STP7NK40ZFP 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 STP7NK40ZFP meets industry standards.

7.What is the process for return or replacement of STP7NK40ZFP?

All STP7NK40ZFP units undergo pre-shipment inspection (PSI). If there is an issue with STP7NK40ZFP, 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 STP7NK40ZFP part is unused and in its original packaging.

Return procedure for STP7NK40ZFP:

1.Submit a request within 90 days.

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

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