FAIRCHILD INDUSTRIAL PROD TFX-17800-401 Hydraulics

( Brand: Fairchild Industrial Prod ), ( Manufacturer Part Number: TFX-17800-401 ), ( Part Type: Hydraulic Pneumatic )

Review FAIRCHILD INDUSTRIAL PROD Tfx17800401 Used

The Fairchild Semiconductor **TFX-17800-401** is a high-performance, high-efficiency, and ultra-compact **17A, 40V N-channel MOSFET** designed for demanding switching applications where minimal conduction and switching losses are critical. Engineered with Fairchild s advanced **TrenchFET Gen III** technology, this MOSFET delivers exceptional performance in power conversion circuits such as DC-DC converters, motor drivers, battery management systems, and high-frequency switching regulators. Its **40V rating** makes it well-suited for low-voltage applications where reliability and efficiency are paramount, while its **17A continuous drain current** ensures robust handling of moderate to high-power loads without excessive heat dissipation. The device features an **RDS(on) of just 3.0m (typical) at VGS of 10V**, providing an optimal balance between conduction efficiency and gate drive requirements, which minimizes power losses during both on-state and switching transitions. Its **low gate charge (Qg) of 18nC** further enhances switching speed, reducing electromagnetic interference (EMI) and enabling faster response times in high-frequency applications. The MOSFET is housed in a **TO-220AB package**, offering a compact yet thermally efficient form factor that facilitates easy integration into PCB designs while maximizing heat dissipation through the standard tab mounting. With built-in **fast reverse recovery body diode**, the TFX-17800-401 eliminates the need for an external diode in synchronous rectification circuits, simplifying design complexity and improving overall system efficiency. Additionally, its **AEC-Q101 qualified** status ensures reliability in automotive and industrial applications where temperature extremes and harsh environments are common. Whether used in portable electronics, renewable energy systems, or high-density power supplies, this MOSFET exemplifies Fairchild s commitment to delivering high-performance, cost-effective solutions that meet the evolving demands of modern power management.

The Fairchild Semiconductor **TFX-17800-401** (or **TFX17800401**) is a **400V, 17A, N-channel MOSFET** designed for high-voltage applications such as power supplies, motor drives, and industrial controls. Below is a detailed analysis of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the TFX-17800-401**

1. **High Voltage Rating (400V)**

- Suitable for applications requiring robust isolation and high-voltage handling, such as switching power supplies, inverters, and motor control circuits.

- Reduces the need for multiple MOSFETs in series, simplifying circuit design.

2. **Low On-Resistance (RDS(on) 17 m VGS 10V)**

- Efficient power switching with minimal conduction losses, improving overall efficiency in high-power applications.

- Helps maintain lower junction temperatures under heavy loads.

3. **Fast Switching Speed**

- Low gate charge (Qg) and fast switching characteristics reduce switching losses, making it ideal for high-frequency applications (e.g., DC-DC converters, PWM controllers).

- Improves dynamic performance in motor drives and charging circuits.

4. **Rugged Construction**

- Designed for industrial environments with good thermal stability and reliability.

- Suitable for applications with frequent switching cycles or transient voltage spikes.

5. **Wide Temperature Range (-55 C to 175 C)**

- Operates reliably in extreme environments, including automotive, aerospace, and industrial machinery.

- Reduces the need for additional cooling in harsh conditions.

6. **TO-247 Package**

- Provides good thermal dissipation, which is critical for high-power MOSFETs.

- Compatible with standard PCB mounting and heat sink attachment.

7. **Low Gate Threshold Voltage (VGS(th) 2 4V)**

- Easier to drive with standard logic-level gate drivers, reducing complexity in control circuits.

8. **Good Avalanche Rating**

- Handles occasional inductive load spikes without permanent damage, improving robustness in motor control and switching applications.

---

### **Cons of the TFX-17800-401**

1. **Limited Current Rating (17A Continuous)**

- May require parallel operation or additional cooling for high-current applications (e.g., >20A).

- Parallel operation can introduce imbalance issues if not properly matched or driven.

2. **Higher Cost Compared to Lower-Voltage MOSFETs**

- 400V MOSFETs are generally more expensive than 200V or 300V alternatives, which may not be cost-effective for low-voltage applications.

- May not justify the expense for simple, low-power circuits.

3. **Sensitivity to Gate Voltage**

- While the low threshold voltage is an advantage, it also means the MOSFET can turn on unintentionally if gate voltage is not properly controlled (e.g., noise or floating gates).

- Requires careful PCB layout and gate driving to avoid misoperation.

4. **Thermal Management Requirements**

- Despite the TO-247 package, high-power operation may still require a heat sink or forced cooling to maintain reliability.

- Excessive junction temperature can reduce lifespan and increase failure risk.

5. **Limited Availability of Direct Replacements**

- Fairchild has been acquired by ON Semiconductor, and while the TFX series is still available, finding exact replacements may be challenging.

- Alternative MOSFETs (e.g., ON Semiconductor s own high-voltage N-channel MOSFETs) may require redesign for compatibility.

6. **Gate Charge Considerations**

- While the switching speed is fast, the gate charge (Qg) may require a higher current gate driver, increasing driver cost or complexity.

7. **Not Ideal for Ultra-High-Frequency Applications**

- While it performs well in high-frequency switching, it may not match the performance of specialized MOSFETs or GaN devices in extreme high-frequency scenarios (e.g., >500 kHz).

---

### **Conclusion**

The **Fairchild TFX-17800-401** is an excellent choice for **high-voltage, medium-to-high-current applications** where efficiency, reliability, and robustness are critical. Its 400V rating, low RDS(on), and fast switching make it well-suited for:

- **Switching power supplies** (e.g., flyback, forward converters).

- **Motor drives and inverters** (e.g., BLDC, AC induction motor control).

- **Industrial power electronics** (e.g., UPS systems, welding machines).

- **Automotive and aerospace applications** (due to its temperature range).

- Low-voltage applications (

- Ultra-high-current applications (>20A) without parallel operation or cooling.

- Cost-sensitive designs where lower-voltage MOSFETs can achieve similar results.

- Applications requiring extreme high-frequency switching (e.g., >1 MHz), where GaN or specialized MOSFETs may be better.

---

### **Recommendation**

- Your application requires **400V isolation** and **efficient switching** (e.g., high-power supplies, motor drives).

- You need **reliability in harsh environments** (wide temperature range, rugged design).

- You can justify the cost and are willing to manage thermal and gate driving requirements.

- Your voltage requirement is **below 300V** (e.g., use an IRF3205 or similar).

- You need **higher current** (>20A) without parallel operation (e.g., consider a 30A MOSFET like the **IRFP460**).

- You are working with **ultra-high frequencies** (e.g., >500 kHz), where GaN FETs (e.g., **GaN Systems GS61008**) or specialized MOSFETs may outperform.

- Cost is a major constraint (e.g., explore ON Semiconductor s **NCS400N17** or **NCD400N17** as direct replacements).

For **high-voltage, medium-current applications** where efficiency and reliability are priorities, the **TFX-17800-401 is a strong, well-suited choice**. Ensure proper thermal management, gate driving, and PCB layout to maximize performance and longevity. If cost or voltage requirements differ, evaluate alternatives carefully.

Details:

Sells new and surplus Product develops channels to purchase such. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection. All Products are guaranteed to be working but may show signs of use if purchasing a used Product. Call to use a shipping service other than the ones listed.

part #: tfx17800401 prices

• $1000.00-$2021.35

specifications generapneumati:

• brand: Fairchild Industrial Prod
• mpn: Tfx-17800-401
• part type: Hydraulic Pneumatic

shipping generapneumati:

• service: Standard
• transit: 25-37 Days
• class: Standard
• cost: $12.90
• type: Fixed

seller generapneumati:

• rating: 99.6%
• # reviews: 191993
• city: 1 Millennium Dr, Willingboro, NJ 08046

general generapneumati:

• Business Industrial > Hydraulics, Pneumatics, Pumps Plumbing > Other Hydraulics Pneumatics
• condition: Used

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returns generapneumati:

• paid by: Buyer
• method: Money back
• time: 30 Days
• policy: Returns Accepted

offer generapneumati:

• quantity: 1
• best offers: True
• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: February 26, 2026

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