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

STMicroelectronics STP6NK70Z

Name: STP6NK70Z
Brand: STMicroelectronics
SKU: STP6NK70Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STP6NK70Z

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: STP6NK70Z.pdf

Description:: MOSFET N-CH 700V 5A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:8,905

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Product details

Overview

STP6NK70Z from STMicroelectronics is an N-channel 700 V, 1.5 Ω (typ), 5 A SuperMESH™ Power MOSFET in TO-220 package with integrated gate-source Zener protection, rated for 100% unclamped inductive avalanche energy (200 mJ), and optimized for high-voltage switching in offline SMPS and lighting ballasts.

For engineers reviewing the STP6NK70Z datasheet, STP6NK70Z pinout, STP6NK70Z application, or STP6NK70Z equivalent, this device is selected for high-dv/dt robustness (4.5 V/ns), low gate charge (34 nC), and ESD-hardened gate (4 kV HBM), critical for flyback and resonant converter primary-side switches.

Technical Context

This MOSFET employs ST's strip-based SuperMESH™ layout to simultaneously reduce R_DS(on) and intrinsic capacitances (C_iss = 930 pF, C_oss = 105 pF) while maintaining high voltage ruggedness. Its built-in back-to-back Zener diodes clamp gate-source transients up to ±30 V, eliminating external protection components.

The device delivers 110 W total dissipation at T_C = 25°C with R_thj-case = 1.14 °C/W, supports repetitive avalanche operation (I_AS = 5 A), and exhibits fast switching (t_d(on) = 17 ns, t_f = 30 ns) under 4.7 Ω gate drive into resistive loads.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	700 V - Withstands full mains-referenced DC bus in 230 VAC offline converters without derating.
R_DS(on) (max)	1.8 Ω - Ensures <1.5 W conduction loss at 5 A continuous drain current in TO-220 package.
I_D (cont)	5 A @ T_C = 25°C - Supports typical 60–100 W SMPS output power levels with adequate thermal margin.
E_AS	200 mJ - Enables reliable unclamped inductive switching in flyback topologies without snubber redesign.
Q_g	34 nC - Reduces gate driver power demand and enables efficient operation with standard 1 A peak drivers.
dv/dt capability	4.5 V/ns - Prevents false turn-on during high-slew-rate voltage transitions in hard-switched converters.
V_ESD (HBM)	4000 V - Eliminates need for external ESD handling precautions during board assembly and handling.

Pinout & Package

STP6NK70Z is housed in a through-hole TO-220 package with three leads: Drain (pin 1), Gate (pin 2), Source (pin 3). The metal tab is electrically connected to the Drain terminal and serves as the primary heat sink interface.

Pin/Terminal	Circuit Role	Design Meaning
1 (Drain)	High-side switch node	Connected directly to primary winding of transformer or bulk capacitor; requires isolation from heatsink unless insulated mounting.
2 (Gate)	Control input	Driven by PWM controller; protected internally by ±30 V Zener clamps; sensitive to ringing-requires local RC snubber if trace inductance >10 nH.
3 (Source)	Power return reference	Serves as common return for gate drive and current sensing; must be low-inductance path to minimize shoot-through risk in half-bridge configurations.

Key Features

Feature	Design Value
Zener-protected gate	Integrated ±30 V bidirectional clamping eliminates external TVS diodes and reduces BOM count in cost-sensitive SMPS designs.
100% avalanche rated	Guaranteed single-pulse avalanche energy of 200 mJ allows safe operation under transient overloads without derating or oversizing.
Low C_oss (105 pF)	Minimizes turn-off losses and improves efficiency in quasi-resonant and LLC converters operating above 100 kHz.
High dv/dt immunity (4.5 V/ns)	Prevents spurious turn-on during rapid drain voltage transitions in high-frequency flyback and forward converters.
ECOPACK® compliant	Lead-free second-level interconnect meets RoHS and JEDEC JESD97 standards for environmentally regulated industrial production.

Applications

LED Driver Ballast

Offline Flyback SMPS

Use Scenario: Constant-current LED driver for commercial downlights operating directly from 230 VAC mains.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch regulating energy transfer to secondary-side LED string via transformer coupling.

Use Value: 700 V rating avoids series stacking; 200 mJ avalanche rating absorbs leakage inductance spikes during MOSFET turn-off without snubber losses.

Use Scenario: 65 W AC/DC adapter for consumer electronics with universal input (85–265 VAC).

IC Role / Device Role / Timing Role: Main power switch in discontinuous conduction mode (DCM) flyback topology, driven by UC3842-class controller.

Use Value: Low Q_g (34 nC) enables clean gate drive with minimal overshoot; 4.5 V/ns dv/dt immunity prevents false triggering during high-slew V_DS transitions.

Industrial PLC Power Supply

Electronic Ballast for Fluorescent Lamps

Use Scenario: 48 V/2 A auxiliary power supply inside programmable logic controller chassis with wide ambient temperature range (−40°C to +70°C).

IC Role / Device Role / Timing Role: Primary-side switch in double-stage design: PFC front-end followed by isolated flyback for control rail generation.

Use Value: R_thj-case = 1.14 °C/W ensures junction temperature stays below 125°C at full load with passive heatsinking, supporting extended lifetime in sealed enclosures.

Use Scenario: High-frequency electronic ballast driving T8 fluorescent tubes in office lighting fixtures.

IC Role / Device Role / Timing Role: Half-bridge upper-leg switch in self-oscillating or microcontroller-driven resonant inverter stage.

Use Value: Low C_iss/C_oss ratio improves zero-voltage switching (ZVS) margin; integrated Zener protection withstands gate stress during lamp ignition transients.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP7NK80Z	800 V V_DSS, 1.8 Ω R_DS(on), same TO-220 package and Zener protection	Better suited for 380 VDC bus or 3-phase rectified inputs where 700 V margin is insufficient	Select when system DC bus exceeds 600 V or long-term reliability under voltage surge conditions is prioritized over conduction loss.
FQP6N70	700 V V_DSS, 1.7 Ω R_DS(on), no integrated Zener, lower ESD rating (2 kV HBM)	Requires external gate protection; not rated for repetitive avalanche	Choose only in cost-constrained, non-safety-critical applications with controlled gate drive and low-transient environments.

Compared with STP7NK80Z and FQP6N70, STP6NK70Z offers optimal balance of voltage margin, conduction loss, and integrated protection for 230 VAC-derived 400 VDC bus applications-making it preferred for certified industrial and lighting power supplies where gate robustness and avalanche reliability are mandatory.

Availability

STP6NK70Z is available at Aetrix Electronics and suitable for offline SMPS, LED driver ballasts, and industrial PLC power supplies requiring stable component supply across multi-year production cycles.

Supply support for STP6NK70Z 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, digital, and mixed-signal ICs, discrete devices, and MEMS sensors for industrial, automotive, and consumer markets.

The SuperMESH™ MOSFET product line targets high-efficiency, high-reliability switching in offline power conversion-specifically engineered to replace legacy planar devices in flyback, forward, and resonant topologies without sacrificing ruggedness.

FAQ

Is STP6NK70Z suitable for use in a 230 VAC input, 12 V/5 A flyback converter?

Yes. With its 700 V V_DSS, 5 A continuous current rating, and 200 mJ avalanche energy, STP6NK70Z safely handles reflected output voltage plus leakage spike in DCM flyback designs delivering up to 60 W. Its 1.5 Ω R_DS(on) keeps conduction loss under 1.5 W at full load with proper heatsinking.

Does STP6NK70Z require an external gate resistor for stability?

A gate resistor (typically 10–47 Ω) is recommended to dampen gate ringing caused by PCB trace inductance interacting with Q_gd and C_iss. While the internal Zener provides overvoltage protection, it does not suppress oscillation-so external R_g remains necessary for reliable switching in production-grade layouts.

Can STP6NK70Z be mounted directly to a shared aluminum heatsink without electrical isolation?

No. Pin 1 (Drain) is internally connected to the metal tab. Mounting without insulating hardware (e.g., silicone pad + shoulder washer) creates a short between Drain and heatsink-potentially causing ground faults or safety violations in Class I equipment. Isolation is mandatory unless the heatsink is fully floating and referenced only to Drain potential.

What is the maximum allowable case temperature for continuous operation?

The absolute maximum case temperature is 150°C per datasheet limits. For reliable 10+ year operation in industrial environments, keep T_C ≤ 115°C using the derating factor of 0.87 W/°C. At 115°C case, maximum usable power drops to ~78 W (110 W − (150−115) × 0.87), ensuring sufficient margin below thermal shutdown.

STP6NK70Z 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:: 5A (Tc)

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

Rds On (Max) @ Id, Vgs:: 1.8Ohm @ 2.5A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 100µA

Gate Charge (Qg) (Max) @ Vgs:: 47 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

STP6NK70Z FAQ

1.How can I place an order for STP6NK70Z through Aetrix?

Please submit a Request for Quotation (RFQ) for STP6NK70Z 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 STP6NK70Z reliable?

The price and inventory of STP6NK70Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP6NK70Z is usually 5 days.

3.What payment methods are accepted for STP6NK70Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP6NK70Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STP6NK70Z?

STP6NK70Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STP6NK70Z 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 STP6NK70Z?

For technical support, including STP6NK70Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP6NK70Z requirements.

6.How does Aetrix verify that STP6NK70Z is sourced from the original manufacturer or authorized distributors?

All STP6NK70Z 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 STP6NK70Z meets industry standards.

7.What is the process for return or replacement of STP6NK70Z?

All STP6NK70Z units undergo pre-shipment inspection (PSI). If there is an issue with STP6NK70Z, 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 STP6NK70Z part is unused and in its original packaging.

Return procedure for STP6NK70Z:

1.Submit a request within 90 days.

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

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