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

STMicroelectronics STB50NF25

Name: STB50NF25
Brand: STMicroelectronics
SKU: STB50NF25
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STB50NF25

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: STB50NF25.pdf

Description:: MOSFET N-CH 250V 45A D2PAK

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Product details

Overview

STB50NF25 from STMicroelectronics is an N-channel 250 V, 45 A, 0.055 Ω R_DS(on) Power MOSFET in D²PAK package, optimized for high-efficiency primary-side switching in offline SMPS and DC-DC converters with low gate charge (68.2 nC) and minimized intrinsic capacitances.

For engineers reviewing the STB50NF25 datasheet, STB50NF25 pinout, STB50NF25 application, or STB50NF25 equivalent, key selection criteria include avalanche ruggedness (32 A repetitive), fast switching (t_d(on) = 45 ns), thermal resistance (R_thj-case = 0.78 °C/W), and ECOPACK® lead-free compliance for industrial power designs.

Technical Context

This STripFET™ II device uses a proprietary trench-gate process to simultaneously reduce R_DS(on) and gate charge-enabling higher frequency operation without sacrificing conduction loss. Its 250 V V_DSS rating supports universal-input AC-DC front-end stages up to 375 V DC bus.

The integrated body diode exhibits 198 ns reverse recovery time (T_j = 25 °C) and 1.5 µC Q_rr, supporting hard-switched flyback and resonant LLC topologies where diode recovery behavior directly impacts EMI and efficiency.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DSS	250 V - Supports 375 V DC bus in universal-input offline converters
R_DS(on) max	0.069 Ω @ V_GS = 10 V - Enables <1.5 W conduction loss at 45 A continuous
I_D cont @ T_C = 25 °C	45 A - Rated for high-current primary switches in 300–500 W SMPS
Q_g	68.2 nC - Reduces driver power demand and enables >100 kHz operation
R_thj-case	0.78 °C/W - Allows 160 W dissipation with ≤125 °C case temperature rise
E_AS	160 mJ - Withstands unclamped inductive switching stress in flyback snubberless designs

Pinout & Package

D²PAK (TO-263) package: surface-mount, isolated drain tab, 3-pin configuration with exposed metal pad for thermal and electrical connection to drain.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control terminal; low input capacitance (C_iss = 2670 pF) minimizes Miller effect
2 (S)	Source	Reference node for gate drive; tied to power ground in common-source topology
3 (D)	Drain	High-voltage output node; electrically and thermally connected to exposed copper pad

Key Features

Feature	Design Value
100% avalanche tested	Guarantees robustness under unclamped inductive switching (E_AS = 160 mJ)
Low gate charge	68.2 nC total charge reduces gate driver losses and enables faster turn-on
Minimized intrinsic capacitances	C_oss = 465 pF and C_rss = 70.5 pF suppress voltage overshoot during hard switching
ECOPACK® compliant	Lead-free second-level interconnect meets JEDEC JESD97 and RoHS requirements

Applications

AC-DC Adapter

Industrial SMPS

Use Scenario: 65–300 W universal-input offline adapter for laptops and monitors.

IC Role / Device Role / Timing Role: Primary-side high-side switch in quasi-resonant flyback controller.

Use Value: Low R_DS(on) and Q_g enable >88% efficiency at full load while meeting EN55022 Class B EMI limits.

Use Scenario: 200–500 W open-frame power supply for PLCs and motor drives.

IC Role / Device Role / Timing Role: Main switch in active-clamp forward converter operating at 100–200 kHz.

Use Value: Avalanche ruggedness eliminates need for external clamping, reducing BOM count and board area.

LED Driver

DC-DC Converter

Use Scenario: Constant-current LED driver for street lighting (30–100 W).

IC Role / Device Role / Timing Role: High-side switch in buck-boost topology driving 40–80 V LED strings.

Use Value: Fast diode recovery (t_rr = 198 ns) minimizes switching loss and audible noise in dimming applications.

Use Scenario: Isolated 48 V–12 V intermediate bus converter in telecom systems.

IC Role / Device Role / Timing Role: Synchronous rectifier or primary switch in phase-shifted full-bridge.

Use Value: Low C_rss improves zero-voltage switching margin and reduces circulating current loss.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP50NF25	Same die, TO-220 package; R_thj-case = 0.78 °C/W identical but lower thermal mass	Suitable for prototyping and lower-volume through-hole assembly	Select when manual soldering or heatsink mounting without reflow is required
IRFP460	Higher R_DS(on) (0.27 Ω), higher Q_g (140 nC), 500 V rating	Better suited for 400 V DC bus applications but less efficient at 250 V	Choose only if higher breakdown voltage is mandatory and efficiency is secondary

Compared with STP50NF25 and IRFP460, STB50NF25 delivers superior power density via D²PAK's lower thermal resistance and smaller footprint, while its lower gate charge enables cleaner switching waveforms in high-frequency SMPS designs.

Availability

STB50NF25 is available at Aetrix Electronics and suitable for AC-DC adapters, industrial SMPS, LED drivers, and DC-DC converters requiring stable component supply across production lifecycles.

Supply support for STB50NF25 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STripFET™ Power MOSFET product line targets high-efficiency switching power supplies, emphasizing low R_DS(on), low gate charge, and rugged avalanche performance for primary-side SMPS applications.

FAQ

What is the maximum continuous drain current at 100 °C case temperature?

The STB50NF25 supports 28 A continuous drain current at T_C = 100 °C, as specified in Table 2 of the datasheet. This derating reflects thermal limitations of the D²PAK package and must be verified against actual PCB layout and heatsinking in the target application.

Does STB50NF25 have a built-in body diode, and what are its recovery characteristics?

Yes, it integrates a fast-recovery body diode with t_rr = 198 ns and Q_rr = 1.5 µC at T_j = 25 °C. These values increase to 256 ns and 2.2 µC at 150 °C, directly impacting switching loss and EMI in hard-switched topologies.

Can STB50NF25 replace STP50NF25 in existing designs?

Yes, with mechanical adaptation: both share identical electrical specs and die, but STB50NF25 uses D²PAK (surface-mount) versus TO-220 (through-hole). Thermal design must account for differences in PCB copper area and solder joint reliability under thermal cycling.

Is STB50NF25 suitable for automotive applications?

No-it is not qualified to AEC-Q101 and lacks automotive-grade screening or guaranteed operation above 125 °C junction temperature. ST recommends dedicated automotive MOSFETs such as STL50DN6LF5 for vehicle systems.

STB50NF25 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 250 V

Current - Continuous Drain (Id) @ 25°C:: 45A (Tc)

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

Rds On (Max) @ Id, Vgs:: 69mOhm @ 22A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 68.2 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 2670 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 160W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

STB50NF25 FAQ

1.How can I place an order for STB50NF25 through Aetrix?

Please submit a Request for Quotation (RFQ) for STB50NF25 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 STB50NF25 reliable?

The price and inventory of STB50NF25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STB50NF25 is usually 5 days.

3.What payment methods are accepted for STB50NF25?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STB50NF25 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STB50NF25?

STB50NF25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STB50NF25 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 STB50NF25?

For technical support, including STB50NF25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STB50NF25 requirements.

6.How does Aetrix verify that STB50NF25 is sourced from the original manufacturer or authorized distributors?

All STB50NF25 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 STB50NF25 meets industry standards.

7.What is the process for return or replacement of STB50NF25?

All STB50NF25 units undergo pre-shipment inspection (PSI). If there is an issue with STB50NF25, 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 STB50NF25 part is unused and in its original packaging.

Return procedure for STB50NF25:

1.Submit a request within 90 days.

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

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