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

STMicroelectronics STP7NK30Z

Name: STP7NK30Z
Brand: STMicroelectronics
SKU: STP7NK30Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STP7NK30Z

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: STP7NK30Z.pdf

Description:: MOSFET N-CH 300V 5A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:4,633

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Product details

Overview

STP7NK30Z from STMicroelectronics is an N-channel, 300 V, 0.80 Ω (max), 5 A Zener-protected SuperMESH™ Power MOSFET in TO-220 package, rated for 50 W total dissipation at T_C = 25 °C and 100% avalanche tested. It delivers high dv/dt capability (4.5 V/ns), low gate charge (13 nC), and integrated gate-source Zener protection (30 V) for robust switching in offline SMPS and AC-DC adapters.

For engineers reviewing the STP7NK30Z datasheet, STP7NK30Z pinout, STP7NK30Z application, or STP7NK30Z equivalent, this page provides verified electrical specs, thermal resistance (R_thj-case = 2.50 °C/W), safe operating area limits, and real-world switching performance (t_d(on) = 11 ns, t_r = 25 ns) under resistive and inductive load conditions.

Technical Context

The STP7NK30Z uses ST's SuperMESH™ layout-a refined strip-based PowerMESH™ structure-optimized to reduce R_DS(on) while preserving high dv/dt immunity (4.5 V/ns) and low intrinsic capacitances (C_iss = 380 pF, C_oss = 74 pF). Its Zener-protected gate ensures ±30 V tolerance and 2800 V HBM ESD rating.

It operates with V_GS(th) = 3–4.5 V, supports continuous I_D = 5 A at T_C = 25 °C (derated to 3.2 A at 100 °C), and sustains unclamped inductive switching with E_AS = 130 mJ and I_AR = 5 A, enabling reliable operation in flyback and forward converters without external gate clamping.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	300 V - Withstands full mains voltage surges up to 264 VAC input with margin in offline switchers.
R_DS(on) max	0.90 Ω @ V_GS = 10 V, I_D = 2.5 A - Enables low conduction loss in 5 A primary-side switching applications.
Q_g	13 nC - Reduces gate drive power and enables efficient operation with standard 10 V gate drivers.
dv/dt capability	4.5 V/ns - Prevents false turn-on during fast transient events in high-noise industrial environments.
E_AS	130 mJ - Absorbs energy from unclamped inductive spikes without failure, eliminating need for snubbers in many designs.
R_thj-case	2.50 °C/W - Supports 50 W dissipation with moderate heatsinking (e.g., 10 cm² aluminum fin).

Pinout & Package

STP7NK30Z is housed in a through-hole TO-220 package with isolated tab (drain-connected), standard 3-pin configuration, and RoHS-compliant ECOPACK® construction.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control terminal; accepts 10 V logic-level drive; protected by integrated 30 V Zener diode.
2 (D)	Drain	Main high-voltage output node; electrically connected to metal tab for thermal conduction and EMI shielding.
3 (S)	Source	Power return path and reference for gate drive; forms common node with driver IC ground in non-isolated topologies.

Key Features

Feature	Design Value
100% avalanche tested	Guarantees ruggedness against unclamped inductive energy (E_AS = 130 mJ) without screening failures.
Zener-protected gate	Integrated back-to-back Zener diodes clamp V_GS to ±30 V, eliminating need for external gate protection components.
Low C_oss (74 pF)	Reduces switching losses and improves efficiency in high-frequency (>100 kHz) SMPS designs.
High dv/dt immunity (4.5 V/ns)	Prevents spurious turn-on during rapid voltage transients on drain, critical in half-bridge and LLC resonant converters.
Good manufacturing repeatability	Tight parameter distribution (e.g., V_GS(th) 3–4.5 V, R_DS(on) < 0.9 Ω) simplifies design margining and production yield assurance.

Applications

Offline AC-DC Adapters

Flyback SMPS

Use Scenario: 36 W universal-input (90–264 VAC) adapter for consumer electronics.

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

Use Value: 0.80 Ω R_DS(on) and 130 mJ E_AS enable >85% efficiency at full load with no snubber, reducing BOM cost and board space.

Use Scenario: 65 W laptop charger with active clamp and synchronous rectification.

IC Role / Device Role: Main switch handling 300 V DC link and 5 A peak current.

Use Value: 4.5 V/ns dv/dt rating prevents false triggering during clamp transitions, improving reliability over 10,000-hour MTBF.

Industrial Motor Drives

LED Driver Power Stages

Use Scenario: Low-power BLDC gate driver stage in HVAC fan control module.

IC Role / Device Role: High-side switch in 3-phase inverter half-bridge leg.

Use Value: TO-220 isolation and 2500 V RMS insulation withstand voltage allow direct mounting to grounded heatsink without creepage barriers.

Use Scenario: Constant-current LED driver for street lighting (230 VAC input, 350 mA output).

IC Role / Device Role: Primary switch in buck-boost PFC + constant-current stage.

Use Value: Low Q_g (13 nC) and fast switching (t_r = 25 ns) minimize losses at 65 kHz switching frequency, maintaining >90% system efficiency.

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
STP8NK30Z	Higher R_DS(on) (0.95 Ω max), same V_DSS, 55 W rating	Slightly lower conduction loss margin; identical pinout and footprint	Select when higher thermal margin is needed at cost of 6% higher I²R loss at 5 A.
FQP7N30	Non-Zener-gated, R_DS(on) = 1.2 Ω max, no avalanche rating	Lacks integrated gate protection and 100% avalanche test; requires external Zener clamp	Choose only in cost-sensitive, low-reliability consumer applications where gate transients are controlled.

Compared with STP8NK30Z, STP7NK30Z offers lower R_DS(on) and tighter parameter spread; versus FQP7N30, it provides guaranteed avalanche ruggedness and built-in gate protection-critical for industrial and medical power supplies requiring long-term field reliability.

Availability

STP7NK30Z is available at Aetrix Electronics and suitable for offline AC-DC adapters, flyback SMPS, and industrial motor drives requiring stable component supply and long-lifecycle support.

Supply support for STP7NK30Z 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.

STP7NK30Z belongs to the SuperMESH™ high-voltage Power MOSFET product line, engineered specifically for high-efficiency, high-reliability offline switching applications where avalanche ruggedness, dv/dt immunity, and gate protection are mandatory.

FAQ

Is STP7NK30Z pin-compatible with STF7NK30Z or STD7NK30Z?

Yes-STP7NK30Z (TO-220), STF7NK30Z (TO-220FP), and STD7NK30Z (DPAK) share identical electrical specifications and pin assignments (G-D-S), differing only in package thermal resistance and mounting method. Mechanical footprints and PCB layouts are not interchangeable due to distinct package outlines and leadforms.

What is the maximum safe operating temperature for continuous operation?

The STP7NK30Z has a maximum junction temperature (T_j) of 150 °C and a storage temperature range of –55 to 150 °C. At T_C = 100 °C, its continuous drain current is derated to 3.2 A; sustained operation above 135 °C junction requires active thermal monitoring and derating per Figure 2's SOA curve.

Does STP7NK30Z require external gate resistor for stability?

A gate resistor (R_G = 4.7 Ω) is specified in the datasheet for switching time characterization and EMI control. While not strictly required for basic turn-on/turn-off, using 4.7–10 Ω improves ringing suppression and reduces dv/dt-induced crosstalk in multi-MOSFET layouts, especially in half-bridge configurations.

Can STP7NK30Z replace IRF740 in existing designs?

STP7NK30Z can substitute IRF740 in most 400 V-class applications due to matching V_DSS (300 V vs. 400 V), but its lower R_DS(on) (0.80 Ω vs. 0.55 Ω) and absence of ultra-low Q_g may alter gate drive timing. Verify SOA compliance at 240 V bus voltage and confirm E_AS margin (130 mJ vs. IRF740's 150 mJ) before drop-in replacement.

STP7NK30Z 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):: 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:: Through Hole

Supplier Device Package:: TO-220

STP7NK30Z FAQ

1.How can I place an order for STP7NK30Z through Aetrix?

Please submit a Request for Quotation (RFQ) for STP7NK30Z 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 STP7NK30Z reliable?

The price and inventory of STP7NK30Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP7NK30Z is usually 5 days.

3.What payment methods are accepted for STP7NK30Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP7NK30Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STP7NK30Z?

STP7NK30Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STP7NK30Z 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 STP7NK30Z?

For technical support, including STP7NK30Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP7NK30Z requirements.

6.How does Aetrix verify that STP7NK30Z is sourced from the original manufacturer or authorized distributors?

All STP7NK30Z 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 STP7NK30Z meets industry standards.

7.What is the process for return or replacement of STP7NK30Z?

All STP7NK30Z units undergo pre-shipment inspection (PSI). If there is an issue with STP7NK30Z, 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 STP7NK30Z part is unused and in its original packaging.

Return procedure for STP7NK30Z:

1.Submit a request within 90 days.

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

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