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

STMicroelectronics STW54NK30Z

Name: STW54NK30Z
Brand: STMicroelectronics
SKU: STW54NK30Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STW54NK30Z

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-247-3

Datasheet:: STW54NK30Z.pdf

Description:: MOSFET N-CH 300V 54A TO247-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STW54NK30Z from STMicroelectronics is an N-channel, 300 V, 54 A, 0.052 Ω R_DS(on) SuperMESH™ MOSFET in TO-247 package, featuring integrated gate-source Zener protection, 100% avalanche tested, and optimized for high-speed switching in offline power supplies and PFC stages.

For engineers reviewing the STW54NK30Z datasheet, STW54NK30Z pinout, STW54NK30Z application, or STW54NK30Z equivalent, key selection criteria include its 300 V V_DSS, 54 A continuous drain current at 25°C, 0.052 Ω R_DS(on), 4.5 V/ns dv/dt capability, and built-in ±30 V gate protection-critical for robust high-voltage SMPS design.

Technical Context

This MOSFET employs ST's SuperMESH™ strip-based layout, delivering ultra-low R_DS(on) while maintaining exceptional dv/dt immunity (4.5 V/ns) and low intrinsic capacitances (C_iss = 4960 pF, C_oss = 745 pF). Its gate charge profile (Q_g = 158 nC, Q_gd = 90 nC) supports efficient high-frequency hard-switching.

The integrated back-to-back gate-source Zener diodes (V_Z = 30 V) provide ESD robustness (6 kV HBM) and transient overvoltage clamping without external components, enabling direct drive from standard PWM controllers in off-line AC-DC converters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	300 V - Withstands full rectified 230 VAC mains with safety margin in PFC and primary-side SMPS
R_DS(on)	0.052 Ω - Enables <1.5 W conduction loss at 54 A, reducing heatsink requirements
I_D (T_C = 25°C)	54 A - Supports high-current DC chopper and boost PFC stages up to 1.5 kW
dv/dt Capability	4.5 V/ns - Resists false turn-on during fast voltage transients in bridge-leg and flyback topologies
Q_g	158 nC - Optimized for 50–200 kHz operation with standard gate drivers (e.g., IR2110, UCC27324)
E_AS	400 mJ - Withstands unclamped inductive switching events without failure, simplifying snubber design
V_GS(th)	3.0–4.5 V - Compatible with 5 V and 12 V logic-level gate drive; avoids partial turn-on near threshold

Pinout & Package

TO-247 package: isolated tab (drain), three leads - pin 1 (gate), pin 2 (drain), pin 3 (source). Metal tab is electrically connected to drain and serves as primary thermal path.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Gate)	Control terminal	Receives PWM signal; requires ≤±30 V drive; protected by integrated Zener clamp
Pin 2 (Drain)	High-side power node	Connected to HV rail (e.g., rectified mains); electrically tied to metal tab for thermal conduction
Pin 3 (Source)	Power return / reference	Serves as local ground for gate drive; carries full load current; low-inductance layout critical

Key Features

Feature	Design Value
Zener-protected gate	Integrated ±30 V bidirectional clamping eliminates need for external gate Zeners in 95% of AC-DC designs
100% avalanche tested	Each unit validated for repetitive I_AR = 54 A and single-pulse E_AS = 400 mJ, ensuring field reliability
Low C_oss & C_rss	C_oss = 745 pF, C_rss = 186 pF - Reduces switching losses and improves EMI behavior in hard-switched converters
High dv/dt immunity	4.5 V/ns rated - Prevents spurious turn-on during fast commutation in half-bridge and LLC resonant circuits

Applications

Server PSU Primary Switch

PFC Boost Switch

Use Scenario: High-efficiency 80 PLUS Titanium server power supply operating at 100 kHz with 3.3 kW output.

IC Role / Device Role / Timing Role: Main switch in continuous conduction mode (CCM) boost PFC stage handling 15 A RMS input current.

Use Value: 0.052 Ω R_DS(on) limits conduction loss to <1.2 W; 400 mJ E_AS absorbs line surge energy without snubber.

Use Scenario: Universal-input (90–264 VAC) adapter with active PFC front-end delivering 120 W.

IC Role / Device Role / Timing Role: Fast-switching boost transistor in transition-mode (TM) PFC controller IC (e.g., L6562A).

Use Value: Low Q_g (158 nC) enables clean zero-current switching; Zener protection tolerates gate ringing up to ±30 V.

Industrial DC Chopper

Motor Drive Inverter Leg

Use Scenario: 48 V/50 A battery-powered DC motor chopper for material handling equipment.

IC Role / Device Role / Timing Role: High-side switching element in 20 kHz PWM-controlled buck-derived chopper circuit.

Use Value: 54 A I_D rating supports peak loads; 4.5 V/ns dv/dt immunity prevents shoot-through during bus transients.

Use Scenario: 3-phase inverter for 750 W BLDC motor in HVAC fan module.

IC Role / Device Role / Timing Role: Upper-leg switch in 600 V DC bus inverter, driven by isolated gate driver (e.g., Si8233).

Use Value: TO-247 package provides low R_th(j-c) = 0.42 °C/W for thermal stability; avalanche ruggedness handles regenerative braking spikes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STW55NF30	R_DS(on) = 0.055 Ω, Q_g = 160 nC, no integrated Zener	Lacks gate-source transient protection; requires external clamping network	Lower cost where board space allows discrete protection and thermal margin permits slightly higher R_DS(on)
IPP54N30P	R_DS(on) = 0.058 Ω, E_AS = 320 mJ, C_iss = 4500 pF	Reduced avalanche energy and higher input capacitance limit high-frequency hard-switching use	Suitable for lower-frequency (<60 kHz), cost-sensitive industrial inverters where Zener protection is externally implemented

Compared with STW54NK30Z, STW55NF30 trades integrated gate protection for marginal R_DS(on) reduction, while IPP54N30P offers lower C_iss but reduced avalanche robustness-making STW54NK30Z optimal for compact, high-reliability PFC and SMPS where gate integrity and transient resilience are non-negotiable.

Availability

STW54NK30Z is available at Aetrix Electronics and suitable for offline power supplies, PFC boost stages, and high-current DC choppers requiring stable component supply and long-term industrial availability.

Supply support for STW54NK30Z 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 automotive, industrial, and consumer markets.

The SuperMESH™ MOSFET product line targets high-efficiency, high-reliability power conversion systems-including server PSUs, telecom rectifiers, and industrial motor drives-by combining low conduction loss with rugged switching performance.

FAQ

Is STW54NK30Z still in active production?

No-STW54NK30Z is marked "Obsolete Product(s)" in its official datasheet revision history (Rev. 1, Jan 2005). However, Aetrix Electronics maintains legacy inventory with full traceability and supports design-in continuity through controlled distribution and cross-reference guidance for functionally aligned replacements.

What is the maximum safe operating temperature for continuous operation?

The device supports continuous operation up to T_j = 150°C, with derated drain current: 54 A at T_C = 25°C, dropping to 34 A at T_C = 100°C. Thermal design must maintain junction temperature below 150°C using the specified R_th(j-c) = 0.42 °C/W and appropriate heatsinking.

Can STW54NK30Z be used without external gate resistors?

No-while the integrated Zener protects against overvoltage, a gate resistor (typically 4.7–22 Ω) is required to control dV/dt, suppress ringing, and limit peak gate current. The datasheet specifies switching times (e.g., t_r = 45 ns) using R_G = 4.7 Ω, confirming its necessity for predictable timing and EMI control.

Does the source-drain diode support synchronous rectification?

No-the body diode has t_rr = 328 ns (25°C) and Q_rr = 2.8 µC, making it unsuitable for synchronous rectification above ~50 kHz. It is designed for freewheeling in hard-switched topologies-not high-frequency reverse recovery. Dedicated SR controllers require faster, lower-Q_rr diodes or MOSFETs with optimized body diodes.

STW54NK30Z 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):: 300 V

Current - Continuous Drain (Id) @ 25°C:: 54A (Tc)

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

Rds On (Max) @ Id, Vgs:: 60mOhm @ 27A, 10V

Vgs(th) (Max) @ Id:: 4.5V @ 150µA

Gate Charge (Qg) (Max) @ Vgs:: 221 nC @ 10 V

Vgs (Max):: ±30V

Input Capacitance (Ciss) (Max) @ Vds:: 4960 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 300W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-247-3

STW54NK30Z FAQ

1.How can I place an order for STW54NK30Z through Aetrix?

Please submit a Request for Quotation (RFQ) for STW54NK30Z 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 STW54NK30Z reliable?

The price and inventory of STW54NK30Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STW54NK30Z is usually 5 days.

3.What payment methods are accepted for STW54NK30Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STW54NK30Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STW54NK30Z?

STW54NK30Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STW54NK30Z 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 STW54NK30Z?

For technical support, including STW54NK30Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STW54NK30Z requirements.

6.How does Aetrix verify that STW54NK30Z is sourced from the original manufacturer or authorized distributors?

All STW54NK30Z 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 STW54NK30Z meets industry standards.

7.What is the process for return or replacement of STW54NK30Z?

All STW54NK30Z units undergo pre-shipment inspection (PSI). If there is an issue with STW54NK30Z, 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 STW54NK30Z part is unused and in its original packaging.

Return procedure for STW54NK30Z:

1.Submit a request within 90 days.

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

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