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

STMicroelectronics STP9NK70Z

Name: STP9NK70Z
Brand: STMicroelectronics
SKU: STP9NK70Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STP9NK70Z

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: STP9NK70Z.pdf

Description:: MOSFET N-CH 700V 7.5A TO220AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STP9NK70ZFP from STMicroelectronics is a Zener-protected N-channel SuperMESH Power MOSFET in TO-220FP package, rated for 700 V drain-source voltage, 1.2 Ω max R_DS(on), and 7.5 A continuous drain current at T_C = 25 °C. It delivers high dv/dt capability (4.5 V/ns), 100% avalanche tested performance, and gate charge minimized for fast switching in offline SMPS and lighting ballasts.

For engineers reviewing the STP9NK70ZFP datasheet, STP9NK70ZFP pinout, STP9NK70ZFP application, or STP9NK70ZFP equivalent, key selection criteria include its 700 V blocking rating, 1.2 Ω on-resistance at 10 V gate drive, 48–68 nC total gate charge, 230 mJ single-pulse avalanche energy, and TO-220FP insulated package with 2.5 kV RMS isolation.

Technical Context

This device implements ST's SuperMESH process - an optimized evolution of PowerMESH - to simultaneously reduce R_DS(on) and enhance ruggedness. Its Zener-protected gate structure enables robust operation under transient overvoltage conditions without external clamping.

The MOSFET features a built-in body diode with 570 ns reverse recovery time and 5.2 µC reverse recovery charge at 150 °C, supporting hard-switched flyback and resonant topologies where diode commutation stress is critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	700 V - supports universal-input offline converters up to 380 V DC bus with margin
R_DS(on) max	1.2 Ω @ V_GS = 10 V - determines conduction loss in 7.5 A continuous applications
Q_g	48–68 nC - defines gate drive power requirement and switching speed trade-off
E_AS	230 mJ - enables unclamped inductive switching without failure in PFC or flyback designs
dv/dt	4.5 V/ns - ensures immunity to false turn-on during high-slew-rate voltage transients
V_ISO	2.5 kV RMS - provides reinforced insulation between leads and heatsink in isolated topologies
I_DM	30 A pulsed - supports peak-current handling in startup or overload conditions

Pinout & Package

Delivered in TO-220FP (Type B) package with internal insulation barrier, enabling direct mounting to heatsink without additional isolation hardware. Pin 1 = Gate, Pin 2 = Drain, Pin 3 = Source.

Pin/Terminal	Circuit Role	Design Meaning
G (Pin 1)	Gate control terminal	Receives 10 V logic-level drive; Zener-protected against ±30 V transients
D (Pin 2)	Drain high-voltage node	Connected to primary-side DC bus; electrically isolated from heatsink by package barrier
S (Pin 3)	Source return path	Reference for gate drive and current sensing; tied to source of driver IC in half-bridge configurations

Key Features

Feature	Design Value
100% avalanche tested	Guarantees single-pulse E_AS = 230 mJ at T_J = 25 °C, eliminating screening risk in surge-prone mains inputs
Zener-protected gate	Integrated 30 V bidirectional clamp prevents gate oxide rupture during ESD or Miller-induced spikes
SuperMESH technology	Reduces R_DS(on) by ~25% vs prior PowerMESH while maintaining >4.5 V/ns dv/dt immunity
Minimized Q_g	48–68 nC enables use with low-power gate drivers (e.g., STMicroelectronics TD350) in space-constrained designs
TO-220FP insulation	2.5 kV RMS isolation allows direct heatsink mounting without insulating pads or sleeves in Class I safety designs

Applications

LED Streetlight Driver

Industrial AC-DC Adapter

Use Scenario: High-efficiency constant-current LED driver operating from 230 V AC mains with active PFC stage.

IC Role / Device Role / Timing Role: Primary-side switch in boost PFC converter, switching at 65–100 kHz.

Use Value: 700 V rating accommodates 385 V DC link with 15% margin; 230 mJ E_AS withstands line surges per IEC 61000-4-5.

Use Scenario: 150 W industrial power supply with wide input range (85–264 V AC) and 24 V/6 A output.

IC Role / Device Role / Timing Role: Main switch in LLC resonant half-bridge primary side.

Use Value: 4.5 V/ns dv/dt capability prevents spurious turn-on during zero-voltage switching transitions.

Electronic Ballast

UPS Inverter Stage

Use Scenario: High-frequency fluorescent lamp ballast with integrated ignition and dimming control.

IC Role / Device Role / Timing Role: Half-bridge upper switch driving resonant tank at 25–50 kHz.

Use Value: TO-220FP insulation eliminates need for thermal pad isolation, reducing assembly cost and thermal resistance.

Use Scenario: Online double-conversion UPS with 1 kVA output and battery backup.

IC Role / Device Role / Timing Role: DC-AC inverter switch handling 350 V DC bus and 230 V AC output.

Use Value: 7.5 A continuous current and 30 A pulsed rating support overload and short-circuit fault currents up to 200% for 10 s.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP10NK70ZFP	700 V, 1.0 Ω max R_DS(on), 10 A I_D, same TO-220FP package	Higher current handling and lower conduction loss; requires larger gate drive due to 75 nC Q_g	Select when system efficiency at full load >92% is required and gate drive capability supports higher Q_g
FQP9N70	700 V, 1.4 Ω max R_DS(on), 9 A I_D, TO-220 (non-isolated) package	No internal insulation; requires external isolating pad for heatsink mounting; lower dv/dt rating (3.5 V/ns)	Choose only in non-isolated or Class II designs where creepage/clearance permits direct heatsink contact

Compared with STP10NK70ZFP and FQP9N70, STP9NK70ZFP offers optimal balance of avalanche ruggedness, gate drive simplicity, and reinforced insulation - making it preferred for Class I industrial SMPS where reliability under surge and thermal stress is prioritized over marginal conduction loss reduction.

Availability

STP9NK70ZFP is available at Aetrix Electronics and suitable for LED streetlight drivers, industrial AC-DC adapters, electronic ballasts, and UPS inverter stages requiring stable component supply across multi-year production cycles.

Supply support for STP9NK70ZFP 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.

The SuperMESH Power MOSFET product line targets high-reliability offline power conversion, emphasizing avalanche ruggedness, high-voltage stability, and reduced gate charge for improved switching efficiency in SMPS, lighting, and motor control.

FAQ

What is the maximum safe operating temperature for STP9NK70ZFP?

The junction temperature must not exceed 150 °C under continuous operation. With R_thJC = 3.6 °C/W, a case temperature of 100 °C corresponds to 13.9 W dissipation - limiting continuous 7.5 A operation to derated duty cycles unless heatsink thermal resistance is ≤ 1.2 °C/W.

Does STP9NK70ZFP require external gate protection?

No external gate Zener is required: the device integrates bidirectional gate protection rated for ±30 V, validated per human-body-model ESD testing (4 kV). However, a 10–22 Ω series gate resistor remains recommended to dampen ringing and limit peak gate current during fast switching.

Can STP9NK70ZFP replace STP9NK70Z in existing designs?

Yes - STP9NK70ZFP is the insulated-package variant of STP9NK70Z (TO-220 non-FP). The FP version adds 2.5 kV RMS isolation and identical electrical specs; mechanical mounting differs due to insulated tab, requiring verification of heatsink clearance and torque specifications per ST's AN4101 guidelines.

What is the typical reverse recovery behavior of the body diode?

At T_J = 150 °C, the body diode exhibits t_rr = 570 ns and Q_rr = 5.2 µC under I_SD = 8 A, di/dt = 100 A/µs. This soft recovery characteristic reduces EMI and voltage overshoot in flyback snubberless designs compared to standard MOSFETs with abrupt diode turn-off.

STP9NK70Z 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):: 700 V

Current - Continuous Drain (Id) @ 25°C:: 7.5A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.2Ohm @ 4A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 100µA

Gate Charge (Qg) (Max) @ Vgs:: 68 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 1370 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 115W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

STP9NK70Z FAQ

1.How can I place an order for STP9NK70Z through Aetrix?

Please submit a Request for Quotation (RFQ) for STP9NK70Z 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 STP9NK70Z reliable?

The price and inventory of STP9NK70Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP9NK70Z is usually 5 days.

3.What payment methods are accepted for STP9NK70Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP9NK70Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STP9NK70Z?

STP9NK70Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STP9NK70Z 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 STP9NK70Z?

For technical support, including STP9NK70Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP9NK70Z requirements.

6.How does Aetrix verify that STP9NK70Z is sourced from the original manufacturer or authorized distributors?

All STP9NK70Z 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 STP9NK70Z meets industry standards.

7.What is the process for return or replacement of STP9NK70Z?

All STP9NK70Z units undergo pre-shipment inspection (PSI). If there is an issue with STP9NK70Z, 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 STP9NK70Z part is unused and in its original packaging.

Return procedure for STP9NK70Z:

1.Submit a request within 90 days.

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

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