FAIRCHILD INDUSTRIAL PROD 1546A Hydraulics Pneumatics

( Brand: Fairchild Industrial Prod ), ( Manufacturer Part Number: 1546A ), ( Part Type: Hydraulic Pneumatic )

Review FAIRCHILD INDUSTRIAL PROD Used

The Fairchild Semiconductor **1546A** is a high-performance, monolithic integrated circuit designed as a precision, low-drift operational amplifier that excels in demanding analog signal processing applications. Introduced as part of Fairchild s legacy of reliable and innovative analog components, this device combines exceptional stability, low noise, and fast slew rate into a compact, 8-pin DIP or SOIC package, making it ideal for a wide range of precision instrumentation, control systems, and data acquisition circuits. The 1546A operates with a single or dual power supply, accommodating input voltages from 5V to 18V, while maintaining an output swing that closely approaches the supply rails, minimizing signal distortion in high-gain configurations. Its fully differential input structure ensures excellent common-mode rejection, reducing interference from noise and power supply fluctuations, which is critical in applications requiring high fidelity, such as audio preamplifiers, active filters, and medical instrumentation.

One of the standout features of the 1546A is its remarkably low input offset voltage, typically less than 1 mV, which remains stable over temperature variations, thanks to its proprietary design techniques that minimize thermal drift. This characteristic makes it particularly suitable for precision measurement systems, where even minute voltage discrepancies can compromise accuracy. The amplifier s high input impedance on the order of 10 12 ohms ensures minimal loading of high-impedance sensors or sources, preserving signal integrity in delicate applications like strain gauges, thermocouples, or photodetector circuits. Additionally, the 1546A delivers a slew rate of up to 10 V/ s, enabling it to handle rapid signal transitions without introducing glitches or overshoot, a vital attribute in pulse-width modulation (PWM) drivers, oscillators, and high-frequency signal conditioning.

The internal architecture of the 1546A incorporates a high-gain, low-offset differential input stage followed by a complementary metal-oxide-semiconductor (CMOS) output stage, which provides both high output drive capability and low static power consumption. This design philosophy allows the amplifier to operate efficiently across a broad range of supply voltages while maintaining low quiescent current, typically under 2 mA, which is advantageous for battery-powered or portable devices where power efficiency is paramount. The device s built-in protection features, such as thermal shutdown and output short-circuit protection, enhance reliability in rugged or dynamically changing environments, reducing the risk of permanent damage from overstress conditions. Whether used in a simple gain stage, as part of a more complex signal chain, or in a feedback configuration for active filtering, the 1546A s combination of precision, speed, and robustness makes it a versatile and enduring choice for engineers seeking a dependable analog solution.

**Pros and Cons of buying a Fairchild 1546A Transistor**

The Fairchild 1546A is a high-voltage, high-power N-channel MOSFET transistor commonly used in switching applications, motor control, and high-voltage circuits. Below is a detailed analysis of its advantages and disadvantages.

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### **Pros of the Fairchild 1546A**

1. **High Voltage Rating**

The 1546A can handle up to **600V** of drain-source voltage, making it suitable for high-voltage applications such as motor drives, inverters, and power supplies where standard MOSFETs would fail.

2. **High Current Handling**

It supports a continuous drain current of **15A** and a peak surge current of **60A**, allowing it to drive moderately sized loads without overheating under normal operating conditions.

3. **Low On-Resistance (Rds(on))**

With an Rds(on) of **1.5 (max) at Vgs 10V**, it provides reasonable efficiency in switching applications, reducing power losses compared to bipolar transistors or higher-resistance MOSFETs.

4. **Fast Switching Speed**

The 1546A has a relatively fast switching time, which is beneficial in high-frequency applications like PWM motor control or inverter circuits, reducing switching losses.

5. **Rugged Construction**

Fairchild Semiconductor is known for producing reliable, durable components with good thermal stability, reducing the risk of premature failure in demanding environments.

6. **Wide Availability and Cost-Effectiveness**

As a legacy but still widely used part, the 1546A is relatively easy to source from distributors like Digi-Key, Mouser, or eBay. While not as cheap as newer alternatives, it remains cost-effective for high-voltage applications where alternatives may be more expensive.

7. **Compatibility with Common Gate Drivers**

It works well with standard logic-level gate drivers (though a level-shifter may be needed for lower voltage control signals), making it easy to integrate into existing circuits.

8. **Good Thermal Characteristics**

The package (TO-220AB) provides decent thermal dissipation, though heat sinking may still be necessary in high-power applications to prevent thermal runaway.

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### **Cons of the Fairchild 1546A**

1. **Outdated Technology**

The 1546A is an older design (introduced in the 1980s), meaning it lacks the efficiency and performance of modern MOSFETs (e.g., GaN FETs or newer silicon MOSFETs with lower Rds(on) and faster switching speeds).

2. **Higher On-Resistance Compared to Modern Alternatives**

Newer high-voltage MOSFETs (e.g., IRFP240, IXFN60N100H, or GaN devices) often have significantly lower Rds(on) values, reducing conduction losses and improving efficiency in switching applications.

3. **Limited Gate Charge**

The gate charge of the 1546A is higher than modern MOSFETs, which can lead to slower switching times and increased gate drive power requirements, especially in high-frequency circuits.

4. **Sensitivity to Gate Voltage**

The 1546A requires a higher gate-source voltage (typically **10V**) to fully enhance, unlike logic-level MOSFETs that can be driven by 3.3V or 5V signals. This may require additional circuitry (e.g., a level-shifter or boost circuit) if interfaced with low-voltage microcontrollers.

5. **Discontinued Status**

While still available, Fairchild has discontinued the 1546A, meaning long-term supply chain reliability cannot be guaranteed. Alternatives may become harder to source over time.

6. **Thermal Management Challenges**

The TO-220AB package, while common, has limited thermal dissipation compared to modern packages like TO-247 or D2PAK. In high-power applications, adequate heat sinking is mandatory to prevent failure.

7. **Higher Switching Losses**

Due to its slower switching characteristics compared to modern MOSFETs, the 1546A may generate more heat in high-frequency switching applications, reducing overall efficiency.

8. **Limited Availability of Replacements**

While similar parts like the IRFP240 or IXFN60N100H exist, they may not be drop-in replacements due to differences in pinout, voltage ratings, or gate drive requirements.

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### **Conclusion**

The Fairchild 1546A is a **practical choice for legacy high-voltage applications** where cost, availability, and moderate performance are prioritized over cutting-edge efficiency. It excels in **low-to-moderate frequency, high-voltage switching tasks** (e.g., motor control, inverters, or power supplies) where its 600V rating and 15A current handling are sufficient. However, for **modern designs requiring high efficiency, fast switching, or low gate drive voltages**, newer MOSFETs (e.g., GaN FETs or advanced silicon MOSFETs) are superior alternatives.

If you are working on a **new project** or an application where efficiency and reliability are critical, upgrading to a modern replacement (e.g., **IXFN60N100H for 600V/15A or a GaN FET for even better performance**) is strongly recommended. For **legacy systems, maintenance, or low-cost high-voltage switching**, the 1546A remains a viable option.

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### **Recommendation**

- You are maintaining or repairing an existing circuit that relies on it.

- Your application is low-to-moderate frequency (e.g.,

- Cost and immediate availability are more important than cutting-edge performance.

- You are comfortable with its limitations (e.g., higher gate voltage requirements, slower switching).

- You are designing a new high-efficiency power circuit (e.g., inverter, DC-DC converter, or motor driver).

- Your application requires fast switching (e.g., >50 kHz) or low gate drive voltages (e.g., 3.3V or 5V).

- You need long-term supply chain reliability, as newer alternatives may be more stable.

- You can source a modern replacement (e.g., **IXFN60N100H, IRFP240, or a GaN FET**) that offers better performance.

- For **600V/15A applications:** IXFN60N100H (logic-level, lower Rds(on), faster switching).

- For **higher efficiency:** GaN FETs (e.g., GaN Systems GS66506B) for even lower losses and faster switching.

- For **simplicity:** IRFP240 (similar to 1546A but with better specs and wider availability).

Details:

Sells new and surplus Product develops channels to purchase such. Call to use a shipping service other than the ones listed. 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.

Part Number 1546A.

part #: 1546a price

• $490.30

specifications generapneumati:

• brand: Fairchild Industrial Prod
• mpn: 1546a
• part type: Hydraulic Pneumatic

shipping generapneumati:

• type: Fixed
• class: Standard
• service: Standard
• transit: 29-34 Days
• cost: $12.90

seller generapneumati:

• city: 1 Millennium Dr, Willingboro, NJ 08046
• # reviews: 196674
• rating: 99.6%

offer generapneumati:

• quantity: 1
• sold: 0
• availability: In Stock
• options: Ship-to-home
• started: March 27, 2026

payments generapneumati:

• credit card: Visa
• wallet: Google-pay
• other

returns generapneumati:

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

general generapneumati:

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

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