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

STMicroelectronics STD2NK70Z-1

Name: STD2NK70Z-1
Brand: STMicroelectronics
SKU: STD2NK70Z-1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STD2NK70Z-1

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-251-3 Short Leads, IPAK, TO-251AA

Datasheet:: STD2NK70Z-1.pdf

Description:: MOSFET N-CH 700V 1.6A IPAK

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Product details

Overview

STD2NK70Z-1 from STMicroelectronics is an N-channel 700 V, 6 Ω (typ), 1.6 A SuperMESH™ MOSFET in IPAK (TO-251) package, featuring integrated gate-source Zener protection, 100% avalanche tested, and optimized for high dv/dt capability in flyback SMPS for battery chargers and industrial power supplies.

For engineers reviewing the STD2NK70Z-1 datasheet, STD2NK70Z-1 pinout, STD2NK70Z-1 application, or STD2NK70Z-1 equivalent, key selection criteria include its 700 V V_DSS, 6 Ω R_DS(on), 45 W P_TOT, Zener-protected gate, and IPAK thermal performance for high-reliability offline switching.

Technical Context

This device implements ST's SuperMESH™ topology - a refined strip-based PowerMESH™ layout - to simultaneously reduce on-resistance and enhance ruggedness against voltage transients. Its gate-source Zener diodes (±30 V breakdown) provide intrinsic ESD and transient overvoltage protection without external components.

The MOSFET is rated for unclamped inductive switching with 110 mJ single-pulse avalanche energy (E_AS) at T_j = 25 °C and supports repetitive avalanche up to 1.6 A (I_AR). Its 4.5 V/ns dv/dt capability ensures stable operation during fast voltage transitions in flyback and single-ended SMPS topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	700 V - Withstands peak drain-source voltage in 230 VAC offline applications with margin.
R_DS(on)	6 Ω (typ) at V_GS = 10 V - Enables low conduction loss in <1.6 A continuous current designs.
I_D (T_C = 25°C)	1.6 A - Continuous drain current rating under heatsink-cooled conditions.
P_TOT	45 W - Maximum power dissipation at case temperature of 25°C; derates 0.36 W/°C above.
dv/dt Capability	4.5 V/ns - Sustains rapid voltage transients during diode recovery without spurious turn-on.
E_AS	110 mJ - Energy absorbed during single-pulse unclamped inductive switching without failure.
V_GS(th)	3.0–4.5 V - Threshold voltage range enabling reliable gate drive with standard 10 V logic-level controllers.

Pinout & Package

STD2NK70Z-1 uses the TO-251 (IPAK) package: three-terminal surface-mount outline with exposed drain pad for thermal conduction and mechanical robustness. Pin 1 = Gate, Pin 2 = Drain (tab), Pin 3 = Source.

Pin/Terminal	Circuit Role	Design Meaning
1 (Gate)	Control terminal	Receives gate drive signal; protected by integrated ±30 V Zener diode.
2 (Drain)	High-voltage power terminal	Connected to switched high-side node (e.g., primary winding of flyback transformer); electrically tied to exposed metal tab.
3 (Source)	Reference and return path	Serves as power ground reference for gate drive and current sensing; low-inductance connection critical for switching stability.

Key Features

Feature	Design Value
Zener-protected gate	Integrated back-to-back Zener diodes clamp V_GS to ±30 V, eliminating need for external gate protection components.
100% avalanche tested	Each unit validated for unclamped inductive switching reliability - critical for flyback snubberless designs.
Extremely high dv/dt capability	Rated 4.5 V/ns - prevents false triggering during fast voltage transitions in high-frequency SMPS.
SuperMESH™ optimized layout	Reduces R_DS(on) while maintaining high breakdown voltage - achieves benchmark 700 V / 6 Ω trade-off.

Applications

Battery Charger Flyback

Industrial SMPS

Use Scenario: Isolated 12–24 V output charger for lead-acid or Li-ion packs using discontinuous conduction mode (DCM) flyback.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch controlling energy transfer timing and regulating output via optocoupler feedback.

Use Value: 700 V rating accommodates 380 V DC bus with safety margin; Zener protection ensures gate integrity during line surges.

Use Scenario: Single-ended forward or flyback converter in programmable logic controller (PLC) power supply.

IC Role / Device Role / Timing Role: Main switching element handling 100–200 kHz switching cycles with tight thermal constraints on PCB.

Use Value: IPAK package delivers 2.78 °C/W R_thj-case, enabling compact heatsinking in space-constrained enclosures.

Monitor Power Supply

Welding Equipment Auxiliary PSU

Use Scenario: Standby and main power stage in LCD monitor AC-DC adapter with dual outputs (5 V/12 V).

IC Role / Device Role / Timing Role: High-side switch in quasi-resonant flyback operating at variable frequency for efficiency optimization.

Use Value: Low Q_g (11.4 nC) and minimized C_iss (280 pF) reduce gate drive losses and improve light-load efficiency.

Use Scenario: Auxiliary isolated DC-DC supply powering control circuitry in IGBT gate drivers for arc welding inverters.

IC Role / Device Role / Timing Role: Robust primary switch subjected to high di/dt and voltage overshoot during load transients.

Use Value: 1.6 A I_AR and 110 mJ E_AS ensure survival under repeated inductive kickback events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP2NK70Z	TO-220 package; identical electrical specs but higher R_thj-amb (62.5 °C/W vs 100 °C/W for IPAK).	Requires larger heatsink; unsuitable for ultra-thin or surface-mount-only layouts.	Select when through-hole assembly and higher thermal mass are acceptable.
FQP7N70C	700 V, 7 Ω R_DS(on), no integrated gate Zener; lower ESD rating (1.5 kV HBM vs 2 kV).	Lacks intrinsic gate protection - mandates external Zener/clamp in noisy environments.	Select only if cost sensitivity outweighs design-in robustness and BOM simplification.

Compared with STP2NK70Z and FQP7N70C, STD2NK70Z-1 uniquely combines IPAK surface-mount compatibility, integrated ±30 V gate Zener protection, and 100% avalanche testing - making it optimal for space-constrained, high-reliability flyback converters where gate robustness and thermal performance are co-critical.

Availability

STD2NK70Z-1 is available at Aetrix Electronics and suitable for battery charger flyback converters, industrial SMPS, monitor power supplies, and welding equipment auxiliary PSUs requiring stable component supply and long-term manufacturability.

Supply support for STD2NK70Z-1 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, designing and manufacturing analog, digital, and mixed-signal ICs and discrete power devices for industrial, automotive, and consumer markets.

STD2NK70Z-1 belongs to ST's SuperMESH™ high-voltage MOSFET product line, engineered specifically for cost-sensitive, high-efficiency offline SMPS in consumer and industrial power supplies where ruggedness, simplicity, and thermal performance are essential.

FAQ

What is the maximum safe operating junction temperature for STD2NK70Z-1?

The absolute maximum operating junction temperature (T_j) is 150 °C. Operation beyond this limit risks permanent degradation of the silicon die and Zener protection structure. Thermal design must ensure T_j remains ≤150 °C under worst-case ambient and power dissipation conditions, using the specified R_thj-case = 2.78 °C/W and derating factor of 0.36 W/°C.

Does STD2NK70Z-1 require an external gate resistor for stability?

Yes - a gate resistor (typically 4.7 Ω, per datasheet test condition) is required to dampen ringing and control switching speed. The device's low Q_g (11.4 nC) and C_iss (280 pF) make it sensitive to PCB layout parasitics; improper gate drive impedance can cause oscillation or excessive EMI in flyback applications.

Can STD2NK70Z-1 replace STD2NK70Z in existing designs?

Yes - STD2NK70Z-1 is the IPAK (TO-251) variant of STD2NK70Z (DPAK/TO-252), sharing identical electrical specifications including V_DSS, R_DS(on), I_D, and avalanche ratings. Mechanical replacement requires footprint revision to accommodate TO-251 dimensions and thermal pad layout, but no circuit redesign is needed.

Is the source-drain body diode suitable for continuous freewheeling in flyback operation?

No - the body diode has limited reverse recovery performance (t_rr = 334 ns at 25 °C) and is not optimized for sustained conduction. In flyback designs, it conducts only during the off-time reset phase; continuous freewheeling would exceed its SOA limits. External synchronous rectification or proper transformer design is recommended for high-duty-cycle applications.

STD2NK70Z-1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

Package/Case:: TO-251-3 Short Leads, IPAK, TO-251AA

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:: 1.6A (Tc)

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

Rds On (Max) @ Id, Vgs:: 7Ohm @ 800mA, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 50µA

Gate Charge (Qg) (Max) @ Vgs:: 11.4 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 280 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 45W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: IPAK

STD2NK70Z-1 FAQ

1.How can I place an order for STD2NK70Z-1 through Aetrix?

Please submit a Request for Quotation (RFQ) for STD2NK70Z-1 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 STD2NK70Z-1 reliable?

The price and inventory of STD2NK70Z-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD2NK70Z-1 is usually 5 days.

3.What payment methods are accepted for STD2NK70Z-1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD2NK70Z-1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STD2NK70Z-1?

STD2NK70Z-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STD2NK70Z-1 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 STD2NK70Z-1?

For technical support, including STD2NK70Z-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD2NK70Z-1 requirements.

6.How does Aetrix verify that STD2NK70Z-1 is sourced from the original manufacturer or authorized distributors?

All STD2NK70Z-1 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 STD2NK70Z-1 meets industry standards.

7.What is the process for return or replacement of STD2NK70Z-1?

All STD2NK70Z-1 units undergo pre-shipment inspection (PSI). If there is an issue with STD2NK70Z-1, 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 STD2NK70Z-1 part is unused and in its original packaging.

Return procedure for STD2NK70Z-1:

1.Submit a request within 90 days.

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

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