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

STMicroelectronics STE40NK90ZD

Name: STE40NK90ZD
Brand: STMicroelectronics
SKU: STE40NK90ZD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STE40NK90ZD

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: ISOTOP

Datasheet:: STE40NK90ZD.pdf

Description:: MOSFET N-CH 900V 40A ISOTOP

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Product details

Overview

STE40NK90ZD from STMicroelectronics is an N-channel SuperFREDMesh™ power MOSFET rated for 900 V drain-source voltage, 0.14 Ω typical R_DS(on) at V_GS = 10 V and I_D = 20 A, 40 A continuous drain current at T_C = 25°C, and 600 W total power dissipation - designed for high-current, high-speed switching in welding equipment and industrial SMPS.

For engineers reviewing the STE40NK90ZD datasheet, STE40NK90ZD pinout, STE40NK90ZD application, or STE40NK90ZD equivalent, key selection criteria include its 8 V/ns dv/dt capability, 100% avalanche tested ruggedness, integrated gate-source Zener protection (±30 V rating), low Q_g (590 nC), and ISOTOP package thermal performance (R_thj-case = 0.2 °C/W).

Technical Context

This device employs ST's optimized strip-based PowerMESH™ layout enhanced as SuperFREDMesh™ to simultaneously minimize R_DS(on) and maximize dv/dt immunity. Its internal structure integrates back-to-back gate-source Zener diodes (V_Z = 30 V) for ESD and transient protection without external components.

The MOSFET delivers 1.2 J single-pulse avalanche energy (E_AS) at V_DD = 35 V and supports unclamped inductive switching with I_AR = 40 A. Its source-drain diode exhibits t_rr = 450 ns and Q_rr = 3.6 µC at T_j = 25°C, enabling fast recovery in hard-switched topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	900 V - supports primary-side switching in 400–800 V DC bus applications like industrial welders and HV SMPS.
R_DS(on) (typ)	0.14 Ω - enables low conduction loss at 40 A, reducing heatsink requirements in high-power stages.
I_D (cont, T_C=25°C)	40 A - defines maximum steady-state current under ideal heatsinking conditions.
Q_g	590 nC - determines gate drive power and switching speed; compatible with standard 1–2 A peak gate drivers.
dv/dt capability	8 V/ns - ensures robust operation during fast voltage transients in noisy industrial environments.
E_AS	1.2 J - quantifies unclamped inductive energy handling without failure, critical for relay/snubberless designs.
R_thj-case	0.2 °C/W - allows direct mounting to heatsink with minimal thermal interface resistance for 600 W dissipation.

Pinout & Package

Package: ISOTOP - isolated TO-style metal package with four terminals (Drain, Source, Gate, Kelvin Source), rated for 2500 V_AC-RMS insulation between all terminals and heatsink. Designed for high-voltage isolation and low-inductance PCB mounting in industrial power modules.

Pin/Terminal	Circuit Role	Design Meaning
Drain (Tab)	Main high-side current path	Electrically connected to metal tab; must be mounted to insulated heatsink; carries full load current and high dv/dt stress.
Source	Power return reference	Primary source terminal for load current return; referenced by gate driver for V_GS control.
Gate	Control input	High-impedance MOS gate requiring <30 V swing; protected by integrated ±30 V Zener diodes.
Kelvin Source	Sense/reference for gate drive	Separate low-noise source connection for accurate gate voltage referencing, minimizing common-source inductance effects.

Key Features

Feature	Design Value
SuperFREDMesh™ architecture	Optimized strip layout delivering 0.14 Ω R_DS(on) while maintaining 8 V/ns dv/dt immunity - balances conduction and switching robustness.
100% avalanche tested	Every unit validated for repetitive and non-repetitive avalanche energy up to 40 A/1.2 J - eliminates screening failures in inductive load circuits.
Integrated gate-source Zener protection	Back-to-back 30 V Zeners absorb gate transients and meet 7 kV HBM ESD rating - removes need for external TVS or clamping diodes.
Low intrinsic capacitances	C_iss = 25,000 pF, C_oss = 1450 pF, C_rss = 280 pF - reduces Miller effect and improves controllability in high-frequency switching.
Enhanced source-drain diode	t_rr = 450 ns, Q_rr = 3.6 µC at 25°C - enables efficient freewheeling in bridge-leg configurations without snubbers.

Applications

Welding Inverter Primary Switch

Industrial HV DC-DC Converter

Use Scenario: High-duty-cycle switching of 600–800 V DC bus in IGBT-assisted or all-MOSFET welding inverters.

IC Role / Device Role / Timing Role: Main high-side power switch operating at 20–50 kHz with hard commutation.

Use Value: 0.14 Ω R_DS(on) minimizes conduction loss at 40 A; 8 V/ns dv/dt rating prevents false turn-on during rapid bus collapse.

Use Scenario: Isolated step-down conversion in factory automation power supplies feeding PLCs and servo drives.

IC Role / Device Role / Timing Role: Primary-side switch in resonant LLC or phase-shifted full-bridge topology.

Use Value: 1.2 J E_AS withstands transformer leakage inductance spikes; 2500 V_AC isolation meets reinforced insulation safety standards.

UPS Inverter Output Stage

Induction Heating Half-Bridge

Use Scenario: Bidirectional power flow control in online double-conversion UPS systems with 400 V DC link.

IC Role / Device Role / Timing Role: Synchronous rectifier or active clamp switch in high-efficiency inverter leg.

Use Value: Kelvin Source terminal enables precise gate drive referencing, suppressing shoot-through risk during fast transitions.

Use Scenario: Resonant tank switching in 20–100 kW induction heating generators.

IC Role / Device Role / Timing Role: High-current half-bridge switch handling pulsed 40 A loads at 10–50 kHz.

Use Value: 600 W power rating and 0.2 °C/W R_thj-case support sustained 40 A operation with forced-air cooling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STW48N90FD	900 V, 0.11 Ω R_DS(on), 48 A I_D, faster t_r/t_f (75/150 ns), but no Kelvin Source	Lacks Kelvin Source; less suitable for high-di/dt synchronous rectification	Preferred where lower R_DS(on) and higher current are prioritized over gate drive precision.
IXFH40N90P	900 V, 0.15 Ω R_DS(on), 40 A I_D, TO-247 package, no integrated Zener, higher C_iss (32,000 pF)	Requires external gate protection; higher drive loss due to larger input capacitance	Used where legacy TO-247 footprint compatibility is required and Zener integration is handled externally.

Compared with STW48N90FD and IXFH40N90P, STE40NK90ZD uniquely combines Kelvin Source for noise-immune gate control, integrated ±30 V Zener protection, and ISOTOP isolation - making it optimal for safety-critical, high-reliability welding and UPS inverters where layout simplicity and ruggedness outweigh marginal R_DS(on) gains.

Availability

STE40NK90ZD is available at Aetrix Electronics and suitable for welding inverters, industrial HV DC-DC converters, UPS output stages, and induction heating systems requiring stable component supply across multi-year production cycles.

Supply support for STE40NK90ZD 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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The SuperFREDMesh™ MOSFET product line targets high-reliability industrial power conversion, emphasizing ruggedness, avalanche tolerance, and integrated protection for demanding hard-switched applications.

FAQ

What is the maximum safe operating temperature for STE40NK90ZD?

The junction temperature must not exceed 150°C under continuous operation. At T_C = 100°C, the continuous drain current derates to 25 A. Thermal design must ensure R_thj-amb ≤ 40 °C/W with adequate heatsinking and airflow, especially given its 600 W power dissipation capability at T_C = 25°C.

Does STE40NK90ZD require external gate protection?

No - it integrates back-to-back gate-source Zener diodes rated at ±30 V, providing inherent protection against ESD (7 kV HBM) and gate voltage transients. This eliminates the need for external TVS diodes in most industrial layouts, simplifying PCB design and improving reliability in electrically noisy environments.

Can STE40NK90ZD replace older STW40NK90Z in existing designs?

Yes - STE40NK90ZD is a direct drop-in replacement for STW40NK90Z with identical ISOTOP package, pinout, and voltage/current ratings. It offers improved manufacturing repeatability and tighter R_DS(on) distribution (0.14 Ω typ vs. 0.16 Ω typ), enabling lower thermal margin requirements without layout changes.

What is the significance of the Kelvin Source terminal in ISOTOP packaging?

The Kelvin Source provides a dedicated low-inductance return path for gate drive circuitry, decoupling power source current from gate reference. This prevents voltage spikes on the gate loop during high-di/dt switching, ensuring stable V_GS control and eliminating false turn-on - critical for reliable operation in paralleled or high-frequency bridge configurations.

STE40NK90ZD Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: SuperFREDmesh™

Package/Case:: ISOTOP

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:: 40A (Tc)

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

Rds On (Max) @ Id, Vgs:: 180mOhm @ 20A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 150µA

Gate Charge (Qg) (Max) @ Vgs:: 826 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 25000 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 600W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Chassis Mount

Supplier Device Package:: ISOTOP®

STE40NK90ZD FAQ

1.How can I place an order for STE40NK90ZD through Aetrix?

Please submit a Request for Quotation (RFQ) for STE40NK90ZD 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 STE40NK90ZD reliable?

The price and inventory of STE40NK90ZD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STE40NK90ZD is usually 5 days.

3.What payment methods are accepted for STE40NK90ZD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STE40NK90ZD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STE40NK90ZD?

STE40NK90ZD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STE40NK90ZD 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 STE40NK90ZD?

For technical support, including STE40NK90ZD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STE40NK90ZD requirements.

6.How does Aetrix verify that STE40NK90ZD is sourced from the original manufacturer or authorized distributors?

All STE40NK90ZD 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 STE40NK90ZD meets industry standards.

7.What is the process for return or replacement of STE40NK90ZD?

All STE40NK90ZD units undergo pre-shipment inspection (PSI). If there is an issue with STE40NK90ZD, 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 STE40NK90ZD part is unused and in its original packaging.

Return procedure for STE40NK90ZD:

1.Submit a request within 90 days.

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

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