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

STMicroelectronics STD7NK30Z

Name: STD7NK30Z
Brand: STMicroelectronics
SKU: STD7NK30Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STD7NK30Z

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: STD7NK30Z.pdf

Description:: MOSFET N-CH 300V 5A DPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STD7NK30Z from STMicroelectronics is an N-channel, 300 V, 0.80 Ω (max), 5 A Zener-protected SuperMESH™ Power MOSFET in DPAK package, designed for high-voltage switching applications such as AC-DC adapters, lighting ballasts, and offline SMPS primary-side switches where robust dv/dt immunity and avalanche ruggedness are required.

For engineers reviewing the STD7NK30Z datasheet, STD7NK30Z pinout, STD7NK30Z application, or STD7NK30Z equivalent, this device offers verified 300 V breakdown voltage, 2800 V HBM ESD rating, 100% avalanche tested operation, low 13 nC total gate charge, and integrated gate-source Zener protection - critical for reliable high-voltage gate drive design.

Technical Context

The STD7NK30Z implements ST's SuperMESH™ topology - an optimized strip-based PowerMESH™ layout delivering 0.80 Ω R_DS(on) at V_GS = 10 V while maintaining 4.5 V/ns peak diode recovery dv/dt capability and 130 mJ single-pulse avalanche energy. Its built-in back-to-back gate-source Zener diodes (BVGSO = 30 V) provide intrinsic transient protection without external components.

This MOSFET operates with 5 A continuous drain current at T_C = 25 °C, 3.2 A at 100 °C, and supports pulsed currents up to 20 A. Thermal resistance is R_thj-case = 2.50 °C/W (DPAK), enabling efficient heat transfer in compact board-level power stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	300 V - Withstands full mains-referenced DC bus voltages in 230 VAC offline converters.
R_DS(on) max	0.90 Ω @ V_GS = 10 V - Enables <1.5 W conduction loss at 5 A, suitable for thermally constrained DPAK layouts.
I_D cont	5 A @ T_C = 25 °C - Supports medium-power SMPS outputs up to ~100 W with proper heatsinking.
Q_g	13 nC - Reduces gate driver power demand and switching losses in 65–100 kHz hard-switched topologies.
E_AS	130 mJ - Guarantees unclamped inductive switching survival in flyback or forward converter primary switches.
dv/dt	4.5 V/ns - Prevents spurious turn-on during fast voltage transients in high-noise power stages.
V_ESD(G-S)	2800 V HBM - Eliminates need for external gate ESD protection in manufacturing and field environments.

Pinout & Package

STD7NK30Z uses the DPAK (TO-252) surface-mount package with standard three-terminal configuration: Gate (G), Drain (D), Source (S). The exposed drain pad provides low-inductance, high-current path and thermal conduction to PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control terminal; accepts 0–10 V logic-level drive; protected by integrated 30 V Zener diode.
2 (D)	Drain	Main high-voltage power terminal; connected to exposed metal pad for thermal and electrical conduction.
3 (S)	Source	Power return node; referenced to control ground; forms common node with internal body diode cathode.

Key Features

Feature	Design Value
Zener-protected gate	Integrated 30 V bidirectional gate-source Zener eliminates external clamping components and improves system BOM simplicity.
100% avalanche tested	Each unit validated for 130 mJ single-pulse avalanche energy - ensures reliability in unclamped inductive switching events.
Low C_iss/C_oss	380 pF input capacitance and 30 pF equivalent output capacitance reduce switching losses and improve light-load efficiency.
High dv/dt immunity	4.5 V/ns rated diode recovery dv/dt prevents false triggering during fast voltage transitions in noisy power circuits.
ECOPACK® compliant	Meets RoHS and halogen-free requirements per ST's environmental packaging standards for industrial and consumer applications.

Applications

AC-DC Adapter Primary Switch

Flyback Converter Main Switch

Use Scenario: 230 VAC input, 65 kHz flyback converter delivering 24 V/2 A output in compact wall-wart adapter.

IC Role / Device Role / Timing Role: High-side main switch handling full rectified DC bus (up to 400 V peak); switched at fixed frequency with current-mode control.

Use Value: 300 V V_DSS margin accommodates line surges; 0.90 Ω R_DS(on) limits conduction loss to <2.3 W at full load; DPAK footprint enables automated assembly.

Use Scenario: Universal-input (90–264 VAC), 12 V/5 A isolated flyback for industrial IoT gateway power supply.

IC Role / Device Role / Timing Role: Primary-side power switch operating in discontinuous conduction mode (DCM) with valley switching.

Use Value: 100% avalanche rating ensures safe operation during transformer saturation events; 13 nC Q_g enables efficient drive with low-cost bipolar gate driver.

Electronic Ballast Control

Offline LED Driver Switch

Use Scenario: 220 VAC-powered fluorescent lamp ballast using half-bridge resonant topology with preheat and run phases.

IC Role / Device Role / Timing Role: Half-bridge low-side switch controlling resonant tank current; subjected to high di/dt and reverse recovery stress.

Use Value: 4.5 V/ns dv/dt rating prevents parasitic turn-on during diode commutation; integrated Zener protects gate from Miller-induced spikes.

Use Scenario: Non-isolated buck-boost LED driver for streetlighting, accepting 100–305 VDC input from PFC stage.

IC Role / Device Role / Timing Role: Main switching element in high-voltage buck-boost regulator driving 36 V/1.5 A LED string.

Use Value: 300 V rating covers worst-case PFC ripple; 5 A I_D supports 1.5 A LED current with 3× safety margin; DPAK thermal performance sustains >75 °C ambient.

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
STP7NK30Z	Same die, TO-220 package; R_thj-case = 2.50 °C/W → same thermal resistance but through-hole mounting; 50 W P_TOT.	Preferred for prototyping, higher-power designs (>100 W), or where mechanical stability outweighs board space constraints.	Select when manual soldering, heatsink bolt-down, or higher pulse current derating is needed.
FQP30N06L	60 V V_DSS, 0.023 Ω R_DS(on), TO-220; lacks Zener protection, avalanche rating, and high-voltage dv/dt capability.	Only suitable for low-voltage DC-DC (≤24 V input); not rated for AC mains-connected topologies.	Avoid in any off-line application; use only in low-voltage battery-fed systems where cost is primary concern.

Compared with STP7NK30Z, STD7NK30Z trades through-hole robustness for SMT manufacturability and smaller footprint; versus FQP30N06L, it delivers essential 300 V ruggedness and integrated protection - making it irreplaceable in mains-referenced switching.

Availability

STD7NK30Z is available at Aetrix Electronics and suitable for AC-DC adapters, electronic ballasts, and offline LED drivers requiring stable component supply across extended production lifecycles.

Supply support for STD7NK30Z 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.

STD7NK30Z belongs to ST's SuperMESH™ Power MOSFET product line - engineered specifically for high-voltage, high-reliability switching in offline power conversion, emphasizing avalanche ruggedness, dv/dt immunity, and gate protection.

FAQ

Is STD7NK30Z suitable for 230 VAC offline flyback converters?

Yes. With 300 V V_DSS, 130 mJ E_AS, and 4.5 V/ns dv/dt rating, STD7NK30Z is explicitly qualified for universal-input (90–264 VAC) flyback converters. Its 0.90 Ω R_DS(on) and DPAK thermal resistance (2.50 °C/W) support reliable operation up to 100 W output with standard PCB copper pour.

Does STD7NK30Z require external gate protection?

No. It integrates bidirectional gate-source Zener diodes with 30 V breakdown (BVGSO), providing inherent protection against overvoltage transients and ESD. External gate resistors remain necessary for switching speed control and ringing suppression, but discrete Zener clamps are redundant.

What is the maximum continuous drain current at 100 °C case temperature?

The datasheet specifies I_D = 3.2 A at T_C = 100 °C for both TO-220 and DPAK packages. This value is limited by junction temperature (T_j ≤ 150 °C) and thermal resistance - not package current rating - and must be validated with actual board-level thermal design.

Can STD7NK30Z replace STP7NK30Z in existing designs?

Electrically identical, yes - same die, parameters, and absolute ratings. Mechanically, DPAK (STD7NK30Z) replaces TO-220 (STP7NK30Z) only if PCB layout supports surface-mount assembly, thermal pad design, and reduced height. No circuit redesign is needed, but thermal validation under real operating conditions is required.

STD7NK30Z Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 300 V

Current - Continuous Drain (Id) @ 25°C:: 5A (Tc)

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

Rds On (Max) @ Id, Vgs:: 900mOhm @ 2.5A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 50µA

Gate Charge (Qg) (Max) @ Vgs:: 13 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 380 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 50W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

STD7NK30Z FAQ

1.How can I place an order for STD7NK30Z through Aetrix?

Please submit a Request for Quotation (RFQ) for STD7NK30Z 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 STD7NK30Z reliable?

The price and inventory of STD7NK30Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STD7NK30Z is usually 5 days.

3.What payment methods are accepted for STD7NK30Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STD7NK30Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STD7NK30Z?

STD7NK30Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STD7NK30Z 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 STD7NK30Z?

For technical support, including STD7NK30Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STD7NK30Z requirements.

6.How does Aetrix verify that STD7NK30Z is sourced from the original manufacturer or authorized distributors?

All STD7NK30Z 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 STD7NK30Z meets industry standards.

7.What is the process for return or replacement of STD7NK30Z?

All STD7NK30Z units undergo pre-shipment inspection (PSI). If there is an issue with STD7NK30Z, 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 STD7NK30Z part is unused and in its original packaging.

Return procedure for STD7NK30Z:

1.Submit a request within 90 days.

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

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