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

STMicroelectronics STW30NF20

Name: STW30NF20
Brand: STMicroelectronics
SKU: STW30NF20
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STW30NF20

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-247-3

Datasheet:: STW30NF20.pdf

Description:: MOSFET N-CH 200V 30A TO247-3

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Product details

Overview

STW30NF20 from STMicroelectronics is an N-channel 200V, 30A, 0.075Ω R_DS(on) Power MOSFET in TO-247 package, featuring low gate charge (38 nC), 100% avalanche tested operation, and optimized figure of merit (R_DS(on) × Q_g) for high-efficiency primary-side switching in isolated DC-DC converters.

For engineers reviewing the STW30NF20 datasheet, STW30NF20 pinout, STW30NF20 application, or STW30NF20 equivalent, key selection criteria include its 200V V_DSS, 125W P_TOT at T_C=25°C, 10 V/ns dv/dt capability, and TO-247 thermal resistance (R_thJC = 1°C/W) for high-power hard-switching topologies.

Technical Context

This STripFET™ II device uses a planar vertical structure with minimized input capacitance (C_iss = 1597 pF) and low reverse transfer capacitance (C_rss = 43 pF), enabling fast switching with reduced Miller effect. Its gate threshold voltage (2–4 V) and transconductance (20 S typical) support robust drive under wide temperature ranges.

The MOSFET delivers 140 mJ single-pulse avalanche energy (E_AS) at T_j = 25°C and supports repetitive avalanche up to 30 A, making it suitable for unclamped inductive load handling in flyback and forward converters without external snubbers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	200 V - Withstands 80% of rated drain-source voltage during diode recovery (dv/dt = 10 V/ns) without failure.
R_DS(on)	0.075 Ω max @ V_GS = 10 V, I_D = 15 A - Enables <1.1 W conduction loss at 30 A continuous current with proper heatsinking.
Q_g	38 nC - Reduces gate driver power requirement and switching transition time in 100–500 kHz SMPS designs.
I_D (T_C = 25°C)	30 A - Supports high-current primary switch operation with derating to 19 A at T_C = 100°C.
E_AS	140 mJ - Absorbs energy from inductive turn-off transients without requiring external clamping in many flyback applications.
R_thJC	1 °C/W - Allows direct thermal path to heatsink; enables 125 W dissipation with ≤125°C junction rise above case.

Pinout & Package

STW30NF20 is housed in a TO-247 package with three leads: Gate (pin 1), Drain (pin 2), Source (pin 3). The metal tab is electrically connected to the Drain terminal and serves as the primary thermal interface.

Pin/Terminal	Circuit Role	Design Meaning
1 (Gate)	Control electrode	Receives 10 V logic-level drive; low Q_g ensures minimal driver loss and fast turn-on/turn-off transitions.
2 (Drain)	Main current output node	Connected to high-voltage DC bus (up to 200 V); tab is electrically tied to this pin for thermal + electrical integration.
3 (Source)	Reference and return path	Serves as power ground reference for gate drive; low-inductance layout critical to suppress ringing during hard switching.

Key Features

Feature	Design Value
Low gate charge (Q_g)	38 nC enables efficient gate driving at >300 kHz with standard 1-A peak drivers, reducing driver IC cost and board space.
100% avalanche tested	Guarantees ruggedness against unclamped inductive switching events without derating or external protection components.
Optimized R_DS(on) × Q_g	2.85 Ω·nC figure of merit improves trade-off between conduction loss and switching loss in high-frequency SMPS.
Low C_rss / C_iss ratio	43 pF / 1597 pF = 2.7% - Minimizes Miller-induced gate oscillation and improves noise immunity in high-dv/dt environments.

Applications

Server PSU Primary Switch

Industrial Flyback Converter

Use Scenario: High-efficiency 80 PLUS Titanium server power supply operating at 250–500 kHz with active clamp or resonant control.

IC Role / Device Role / Timing Role: Primary-side main switch handling 30 A peak currents and 200 V DC bus in discontinuous conduction mode (DCM) or quasi-resonant (QR) topology.

Use Value: Low Q_g and R_DS(on) reduce total switching + conduction losses, enabling >96% efficiency at full load while maintaining thermal margin.

Use Scenario: 150 W isolated flyback converter for industrial PLC I/O modules requiring reinforced insulation and high reliability.

IC Role / Device Role / Timing Role: Main power switch managing 200 V input, delivering regulated 24 V output with tight cross-regulation across multiple secondaries.

Use Value: 140 mJ E_AS and 100% avalanche rating eliminate need for external RCD snubber, simplifying BOM and improving long-term field reliability.

Telecom DC-DC Brick

EV Onboard Charger Auxiliary Supply

Use Scenario: 48 V input telecom half-brick DC-DC module converting to 12 V/5 V for base station control circuitry.

IC Role / Device Role / Timing Role: Primary-side switch in forward converter with synchronous rectification on secondary side.

Use Value: TO-247 package with R_thJC = 1°C/W allows direct mounting to cold plate, sustaining 30 A continuous current without thermal throttling.

Use Scenario: Auxiliary 12 V supply in EV onboard charger using 400 V battery input to power MCU, gate drivers, and sensors.

IC Role / Device Role / Timing Role: High-side switch in buck-derived isolated auxiliary converter operating in harsh automotive ambient (−40°C to +105°C).

Use Value: Stable V_GS(th) (2–4 V) and low R_DS(on) drift over temperature ensure consistent turn-on timing and minimal dropout across full automotive range.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel 200V Power MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRFP460PBF	R_DS(on) = 0.27 Ω (higher), Q_g = 140 nC (3.7× higher), TO-247 package	Higher conduction + switching losses limit use to <100 kHz; requires stronger gate driver	Select when legacy design compatibility or lower-cost sourcing is prioritized over efficiency.
IXTH30N20P	R_DS(on) = 0.07 Ω (similar), Q_g = 42 nC (slightly higher), avalanche energy = 120 mJ (14% lower)	Marginally lower ruggedness in unclamped inductive switching; same frequency capability	Choose if preferred supplier ecosystem or specific qualification history (e.g., MIL-PRF-19500) is required.

Compared with IRFP460PBF and IXTH30N20P, STW30NF20 offers superior figure of merit (2.85 vs 7.0 and 2.94 Ω·nC), higher E_AS, and tighter R_DS(on) distribution-making it optimal for high-frequency, high-reliability 200 V primary switches where thermal and avalanche margins are critical.

Availability

STW30NF20 is available at Aetrix Electronics and suitable for server power supplies, industrial flyback converters, and telecom DC-DC bricks requiring stable component supply, long-lifecycle support, and traceable manufacturing origin.

Supply support for STW30NF20 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 industrial, automotive, and consumer markets.

STW30NF20 belongs to the STripFET™ II Power MOSFET product line, engineered specifically to minimize gate charge and input capacitance for high-frequency, high-efficiency switching power conversion in enterprise and industrial infrastructure.

FAQ

Is STW30NF20 suitable for 500 kHz operation?

Yes. With Q_g = 38 nC, C_iss = 1597 pF, and t_d(on)/t_r = 35/15.7 ns, STW30NF20 supports clean switching at 500 kHz in hard-switched topologies when paired with a 1.5-A peak gate driver and optimized PCB layout. Thermal management remains critical above 300 kHz due to increased switching loss density.

What is the maximum safe operating area (SOA) at 100°C case temperature?

At T_C = 100°C, the SOA is limited by both current and voltage constraints: maximum continuous I_D = 19 A, and for pulsed operation (t ≤ 10 ms), V_DS must remain below ~120 V at 30 A per Figure 2 in the datasheet. Derating curves confirm linear reduction from 125 W at 25°C to ~45 W at 100°C.

Does STW30NF20 require a negative gate turn-off voltage?

No. STW30NF20 has a gate threshold voltage (V_GS(th)) of 2–4 V and is fully enhanced at V_GS = 10 V. While −5 V turn-off improves noise immunity in high-dv/dt environments, it is not required for reliable operation; 0 V gate return is sufficient for most isolated gate driver implementations.

Can STW30NF20 replace STP30NF20 in existing TO-220 layouts?

No. STW30NF20 uses TO-247 packaging (larger footprint, different lead spacing, and drain-connected tab), whereas STP30NF20 uses TO-220. Mechanical and thermal interfaces are incompatible. A board redesign is required to accommodate TO-247 mounting, heatsink interface, and creepage/clearance adjustments.

STW30NF20 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™

Package/Case:: TO-247-3

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 200 V

Current - Continuous Drain (Id) @ 25°C:: 30A (Tc)

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

Rds On (Max) @ Id, Vgs:: 75mOhm @ 15A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 38 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1597 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 125W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-247-3

STW30NF20 FAQ

1.How can I place an order for STW30NF20 through Aetrix?

Please submit a Request for Quotation (RFQ) for STW30NF20 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 STW30NF20 reliable?

The price and inventory of STW30NF20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STW30NF20 is usually 5 days.

3.What payment methods are accepted for STW30NF20?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STW30NF20 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STW30NF20?

STW30NF20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STW30NF20 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 STW30NF20?

For technical support, including STW30NF20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STW30NF20 requirements.

6.How does Aetrix verify that STW30NF20 is sourced from the original manufacturer or authorized distributors?

All STW30NF20 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 STW30NF20 meets industry standards.

7.What is the process for return or replacement of STW30NF20?

All STW30NF20 units undergo pre-shipment inspection (PSI). If there is an issue with STW30NF20, 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 STW30NF20 part is unused and in its original packaging.

Return procedure for STW30NF20:

1.Submit a request within 90 days.

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

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