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

STMicroelectronics STP3HNK90Z

Name: STP3HNK90Z
Brand: STMicroelectronics
SKU: STP3HNK90Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STP3HNK90Z

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-220-3

Datasheet:: STP3HNK90Z.pdf

Description:: MOSFET N-CH 800V 3A TO220AB

Quantity:: RFQ Add To RFQ list

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Inventory:3,111

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Product details

Overview

STP3HNK90Z from STMicroelectronics is an N-channel 900 V, 3 A, 0.42 Ω (max) SuperMESH™ Power MOSFET in TO-220 package, featuring integrated gate-source Zener protection, 100% avalanche tested operation, and 4.5 V/ns dv/dt capability-designed for high-voltage flyback and resonant switching converters in industrial power supplies.

For engineers reviewing the STP3HNK90Z datasheet, STP3HNK90Z pinout, STP3HNK90Z application, or STP3HNK90Z equivalent, this device supports high-reliability offline SMPS designs requiring robust unclamped inductive switching, low gate charge (26 nC), and thermal stability up to 150 °C junction temperature.

Technical Context

This MOSFET employs ST's optimized strip-based PowerMESH™ layout to minimize R_DS(on) while preserving exceptional dv/dt immunity-critical for EMI-sensitive high-frequency converters. Its built-in back-to-back Zener diodes clamp gate-source transients to ±30 V, eliminating external protection components.

The device delivers 200 mJ single-pulse avalanche energy at T_j = 25 °C and sustains 3 A repetitive avalanche current. With C_iss = 690 pF and Q_gd/Q_gs ratio of ~2.4, it enables fast, controllable switching in hard-switched topologies with reduced Miller-induced turn-off delay.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	900 V - Supports 400 VAC mains-derived bus voltages with ≥2× safety margin in offline converters
R_DS(on) max	0.42 Ω @ V_GS = 10 V, I_D = 1.5 A - Enables <1.3 W conduction loss at 3 A continuous drain current
Q_g	26 nC - Reduces gate drive power requirement and allows use of low-cost bipolar or CMOS drivers
dv/dt capability	4.5 V/ns - Ensures reliable operation under fast voltage transients without spurious turn-on
E_AS	200 mJ - Absorbs energy from leakage inductance spikes in flyback transformers without failure
T_J max	150 °C - Permits operation in sealed enclosures or high-ambient industrial environments
R_thj-case	1.38 °C/W - Enables 90 W dissipation with standard TO-220 heatsink (ΔT = 124 °C)

Pinout & Package

TO-220 package: insulated tab, vertical mounting, lead-free ECOPACK® compliant. Thermal resistance junction-to-case is 1.38 °C/W (max).

Pin/Terminal	Circuit Role	Design Meaning
1 (Source)	Power return path for load current	Low-inductance connection point; referenced to PCB ground plane for stable switching node control
2 (Gate)	Control electrode for channel conduction	Protected by integrated ±30 V Zener; requires <10 Ω series resistor to damp ringing during fast transitions
3 (Drain)	High-voltage power input terminal	Connected to primary winding of flyback transformer or DC bus; electrically isolated from heatsink via insulating washer

Key Features

Feature	Design Value
Zener-protected gate	Integrated ±30 V gate-source clamping eliminates need for external TVS diodes in gate drive circuits
100% avalanche tested	Every unit validated for 3 A repetitive avalanche current and 200 mJ single-pulse energy at 25 °C
Low C_oss & C_rss	71 pF output capacitance and 14.4 pF reverse transfer capacitance reduce switching losses and improve light-load efficiency
High dv/dt immunity	4.5 V/ns rated slope prevents false triggering during rapid drain voltage transitions in high-noise environments
SuperMESH™ layout	Optimized cell structure achieves 0.42 Ω R_DS(on) at 900 V while maintaining manufacturing repeatability across wafer lots

Applications

Industrial Flyback SMPS

LED Driver Power Stage

Use Scenario: 75 W universal-input offline flyback converter powering PLC I/O modules.

IC Role / Device Role / Timing Role: Primary-side high-voltage switch controlling energy transfer into transformer during PWM on-time.

Use Value: 900 V rating accommodates 385 VDC bus with margin; 200 mJ E_AS safely absorbs leakage inductance spikes without snubber redesign.

Use Scenario: Constant-current LED driver for street lighting operating from 230 VAC mains.

IC Role / Device Role / Timing Role: Main switching element in quasi-resonant flyback topology regulating LED string current.

Use Value: Low Q_g (26 nC) enables efficient 65–100 kHz switching; Zener gate protection ensures reliability against line surges and ESD events.

AC-DC Adapter Primary Switch

Industrial Motor Control Snubber

Use Scenario: 48 V/1.5 A adapter for industrial sensors with wide ambient temperature range.

IC Role / Device Role / Timing Role: High-side switch in discontinuous conduction mode (DCM) flyback delivering regulated output.

Use Value: R_DS(on) ≤ 0.42 Ω limits conduction loss to <1.3 W at full load; 150 °C T_J max supports operation in sealed metal enclosures.

Use Scenario: Clamping switch in IGBT-based 3-phase inverter for HVAC compressors.

IC Role / Device Role / Timing Role: Active snubber element absorbing turn-off energy from motor phase inductance.

Use Value: Avalanche-rated construction handles repetitive 3 A transient currents; 4.5 V/ns dv/dt tolerance prevents false triggering during bus voltage overshoot.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP3NK90Z	Same 900 V rating but lacks integrated gate Zener diodes; R_DS(on) = 0.45 Ω (max)	Requires external gate protection circuitry; less suitable for surge-prone industrial mains interfaces	Select when cost sensitivity outweighs need for integrated transient protection and board space is available for discrete Zeners
FQP9N90C	900 V, 9 A, R_DS(on) = 0.95 Ω; higher current rating but larger gate charge (65 nC) and no avalanche rating	Not rated for repetitive avalanche; unsuitable for unclamped inductive switching without external clamping	Prefer only in fixed-frequency, low-di/dt applications where peak current exceeds 3 A and avalanche stress is absent

Compared with STP3NK90Z and FQP9N90C, STP3HNK90Z uniquely combines Zener-protected gate, 100% avalanche testing, and 0.42 Ω R_DS(on) in TO-220-making it optimal for compact, high-reliability flyback converters where gate integrity and ruggedness are non-negotiable.

Availability

STP3HNK90Z is available at Aetrix Electronics and suitable for industrial power supplies, LED drivers, and AC-DC adapters requiring stable component supply and long-term design continuity.

Supply support for STP3HNK90Z 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 silicon solutions for automotive, industrial, and power applications.

STP3HNK90Z belongs to the SuperMESH™ high-voltage MOSFET product line, engineered specifically for high-efficiency, high-reliability offline switching power supplies operating above 400 VDC bus voltages.

FAQ

Is STP3HNK90Z still in active production?

STP3HNK90Z is listed as obsolete by STMicroelectronics per official documentation dated August 2006. However, Aetrix Electronics maintains legacy inventory with full traceability and offers extended supply support-including obsolescence mitigation planning-for industrial customers dependent on this qualified high-voltage MOSFET.

What is the maximum safe operating temperature for STP3HNK90Z?

The absolute maximum junction temperature is 150 °C. Derating begins at 25 °C case temperature with a thermal resistance of 1.38 °C/W; sustained operation above 125 °C junction requires active heatsinking and airflow verification per Figure 1 (Safe Operating Area) in the datasheet.

Can STP3HNK90Z replace STP3NK90Z directly?

No direct replacement: STP3HNK90Z includes integrated gate-source Zener diodes (±30 V), while STP3NK90Z does not. Swapping requires removing external gate protection components and verifying gate drive loop stability, as Zener capacitance affects high-frequency response.

Does STP3HNK90Z require a heatsink in typical applications?

Yes-its 90 W total dissipation rating assumes use of a properly sized heatsink. At 3 A continuous current and 0.42 Ω R_DS(on), conduction loss alone reaches ~3.8 W; without heatsinking, junction temperature would exceed 150 °C within seconds under load.

STP3HNK90Z 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):: 800 V

Current - Continuous Drain (Id) @ 25°C:: 3A (Tc)

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

Rds On (Max) @ Id, Vgs:: 4.2Ohm @ 1.5A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 50µA

Gate Charge (Qg) (Max) @ Vgs:: 35 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 690 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 90W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

STP3HNK90Z FAQ

1.How can I place an order for STP3HNK90Z through Aetrix?

Please submit a Request for Quotation (RFQ) for STP3HNK90Z 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 STP3HNK90Z reliable?

The price and inventory of STP3HNK90Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP3HNK90Z is usually 5 days.

3.What payment methods are accepted for STP3HNK90Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP3HNK90Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STP3HNK90Z?

STP3HNK90Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STP3HNK90Z 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 STP3HNK90Z?

For technical support, including STP3HNK90Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP3HNK90Z requirements.

6.How does Aetrix verify that STP3HNK90Z is sourced from the original manufacturer or authorized distributors?

All STP3HNK90Z 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 STP3HNK90Z meets industry standards.

7.What is the process for return or replacement of STP3HNK90Z?

All STP3HNK90Z units undergo pre-shipment inspection (PSI). If there is an issue with STP3HNK90Z, 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 STP3HNK90Z part is unused and in its original packaging.

Return procedure for STP3HNK90Z:

1.Submit a request within 90 days.

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

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