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

STMicroelectronics STY30NK90Z

Name: STY30NK90Z
Brand: STMicroelectronics
SKU: STY30NK90Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STY30NK90Z

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-247-3

Datasheet:: STY30NK90Z.pdf

Description:: MOSFET N-CH 900V 26A MAX247

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STY30NK90Z from STMicroelectronics is an N-channel SuperMESH™ power MOSFET rated for 900 V drain-source voltage, 0.21 Ω typical R_DS(on) at V_GS = 10 V and I_D = 14 A, 26 A continuous drain current at T_C = 25°C, and housed in the Max247 package. It serves as a high-voltage switching device in offline SMPS, PFC stages, and industrial AC-DC converters.

For engineers reviewing the STY30NK90Z datasheet, STY30NK90Z pinout, STY30NK90Z application, or STY30NK90Z equivalent, key selection criteria include its 900 V V_DS, Zener-protected gate, 4.5 V/ns dv/dt capability, 100% avalanche tested rating, and low C_iss (12 nF) for hard-switching efficiency.

Technical Context

This MOSFET employs ST's SuperMESH™ strip-based layout to minimize R_DS(on) while preserving robust dv/dt immunity (4.5 V/ns) and avalanche ruggedness (E_AS = 500 mJ). Its integrated back-to-back gate-source Zener diodes provide ±30 V gate protection without external components.

The device features low intrinsic capacitances (C_iss = 12,000 pF, C_oss = 852 pF), fast switching (t_d(on) = 67 ns, t_f = 72 ns), and gate charge optimized for high-frequency operation (Q_g = 350 nC at V_DD = 720 V).

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	900 V - supports primary-side switching in universal-input 85–265 VAC offline converters
R_DS(on)	0.21 Ω (typ) - enables low conduction loss at 26 A DC, critical for >300 W PFC designs
I_D (cont)	26 A @ T_C = 25°C - defines thermal design margin for heatsink sizing in forced-air cooled systems
E_AS	500 mJ - ensures single-pulse unclamped inductive switching survivability in relay/snubberless circuits
dv/dt	4.5 V/ns - sustains reliable operation under fast transient noise in high-noise industrial environments
C_iss	12,000 pF - impacts gate drive power and switching speed; requires ≥2 A peak gate driver for <100 ns transitions

Pinout & Package

STY30NK90Z is packaged in the Max247 (TO-247 variant with 3-pin vertical leadframe), a through-hole power package with isolated tab for direct heatsink mounting and creepage/clearance compliant with IEC 60950.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main high-voltage current path	Electrically connected to metal tab - must be insulated from chassis unless referenced to high-side ground
Source	Reference node for gate control & current return	Low-inductance connection point for gate driver return and sense resistor placement
Gate	Control terminal for channel modulation	Protected by integrated ±30 V Zener; requires <100 Ω series resistance to limit Q_g-related ringing

Key Features

Feature	Design Value
Zener-protected gate	Integrated back-to-back 30 V gate-source Zeners eliminate need for external TVS, reducing BOM count and PCB area
100% avalanche tested	Every unit validated for repetitive and non-repetitive avalanche energy (I_AR = 26 A, E_AS = 500 mJ), enabling robust overvoltage handling
SuperMESH™ layout	Optimized strip geometry achieves 0.21 Ω R_DS(on) at 900 V while maintaining >4 V/ns dv/dt immunity
Low C_oss & C_rss	C_oss = 852 pF, C_rss = 166 pF - minimizes Miller effect, easing gate drive design in high-frequency flyback/PFC

Applications

Industrial Motor Drives

Server PSU Primary Switch

Use Scenario: High-voltage half-bridge in 3-phase inverter drives for HVAC compressors and pumps.

IC Role / Device Role / Timing Role: High-side switching element handling 600–800 V DC bus with 20–25 A RMS load current.

Use Value: Avalanche ruggedness and 4.5 V/ns dv/dt prevent false turn-on during bus transients caused by IGBT commutation.

Use Scenario: Main switch in 1 kW+ active clamp forward or LLC resonant converter in datacenter PSUs.

IC Role / Device Role / Timing Role: Primary-side power switch operating at 100–300 kHz with 700–900 V blocking requirement.

Use Value: Low C_iss and optimized Q_g/Q_gd ratio reduce switching losses and improve ZVS initiation margin.

Off-line LED Driver

Induction Heating Half-Bridge

Use Scenario: Flyback controller primary switch in high-bay LED drivers with universal AC input.

IC Role / Device Role / Timing Role: 900 V-rated switch managing 15–20 A peak currents during startup and overload conditions.

Use Value: Integrated gate Zener prevents gate oxide failure during line surges and lightning-induced transients.

Use Scenario: High-frequency half-bridge in 20–50 kHz induction cooktops using resonant tank topologies.

IC Role / Device Role / Timing Role: Fast-switching power stage delivering 2–3 kW into parallel-resonant LC load.

Use Value: Low R_DS(on) (0.21 Ω) and high I_D (26 A) enable efficient conduction at high duty cycles without thermal derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STW30NK90Z	Same die, TO-247-3L package (non-isolated tab); R_DS(on) identical, but no built-in gate Zener	Requires external gate protection; preferred where tab grounding simplifies thermal path	Select when board layout allows direct tab grounding and external Zener is acceptable
IPP60R099CP	650 V CoolMOS™ P7, R_DS(on) = 0.099 Ω, lower Q_g (120 nC), but lower V_DS	Not suitable for 900 V bus; limited to 400 V DC-link topologies like boost PFC	Choose only for 650 V-class designs prioritizing switching loss over voltage headroom

Compared with STW30NK90Z, STY30NK90Z offers integrated gate protection and isolated tab for safer high-voltage isolation; versus IPP60R099CP, it trades higher R_DS(on) and Q_g for essential 900 V rating and avalanche hardness in mains-connected systems.

Availability

STY30NK90Z is available at Aetrix Electronics and suitable for industrial motor drives, server power supplies, off-line LED drivers, and induction heating systems requiring stable component supply and long-term lifecycle support.

Supply support for STY30NK90Z 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, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The SuperMESH™ MOSFET product line targets high-voltage, high-reliability switching applications-especially offline power conversion where avalanche ruggedness, dv/dt immunity, and gate protection are critical.

FAQ

Is STY30NK90Z still in active production?

No-STY30NK90Z is marked as Obsolete Product(s) in ST's official documentation (Rev 4, Oct 2006). While not actively manufactured, Aetrix Electronics maintains legacy inventory and supports design continuity via controlled allocation and cross-reference guidance for drop-in replacements.

What is the maximum safe operating temperature for the junction?

The maximum operating junction temperature (T_J) is 150°C, with storage temperature ranging from –65°C to +150°C. Thermal design must respect R_thj-case = 0.277°C/W max to avoid exceeding this limit under 26 A continuous conduction at T_C = 25°C.

Can STY30NK90Z replace STW30NK90Z in existing designs?

Yes-with caveats: STY30NK90Z uses an electrically isolated tab (Max247), whereas STW30NK90Z has a conductive tab (TO-247-3L). Layout must verify creepage/clearance compliance and confirm gate protection is not duplicated externally.

Does the built-in Zener protect against both positive and negative gate transients?

Yes-the device integrates back-to-back Zener diodes between gate and source, providing symmetrical ±30 V clamping (BVGSO = 30 V min) for bidirectional transient suppression without polarity sensitivity.

STY30NK90Z Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperMESH™

Package/Case:: TO-247-3

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 900 V

Current - Continuous Drain (Id) @ 25°C:: 26A (Tc)

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

Rds On (Max) @ Id, Vgs:: 260mOhm @ 14A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 150µA

Gate Charge (Qg) (Max) @ Vgs:: 490 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 12000 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 450W (Tc)

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: MAX247™

STY30NK90Z FAQ

1.How can I place an order for STY30NK90Z through Aetrix?

Please submit a Request for Quotation (RFQ) for STY30NK90Z 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 STY30NK90Z reliable?

The price and inventory of STY30NK90Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STY30NK90Z is usually 5 days.

3.What payment methods are accepted for STY30NK90Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STY30NK90Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STY30NK90Z?

STY30NK90Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STY30NK90Z 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 STY30NK90Z?

For technical support, including STY30NK90Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STY30NK90Z requirements.

6.How does Aetrix verify that STY30NK90Z is sourced from the original manufacturer or authorized distributors?

All STY30NK90Z 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 STY30NK90Z meets industry standards.

7.What is the process for return or replacement of STY30NK90Z?

All STY30NK90Z units undergo pre-shipment inspection (PSI). If there is an issue with STY30NK90Z, 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 STY30NK90Z part is unused and in its original packaging.

Return procedure for STY30NK90Z:

1.Submit a request within 90 days.

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

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