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MMBTH11 from FAIRCHILD,Fairchild Semiconductor

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MMBTH11

Manufacturer: FAIRCHILD, FAIRCHIL

NPN RF Transistor

Partnumber Manufacturer Quantity Availability
MMBTH11 FAIRCHILD, FAIRCHIL 12000 In Stock

Description and Introduction

NPN RF Transistor **Introduction to the MMBTH11 Transistor**  

The MMBTH11 is a high-frequency NPN bipolar junction transistor (BJT) designed for small-signal amplification and switching applications. Known for its compact SOT-23 package, this component is widely used in RF and low-power circuits where space efficiency and performance are critical.  

With a maximum collector-emitter voltage (VCEO) of 40V and a collector current (IC) rating of 50mA, the MMBTH11 is suitable for applications such as signal processing, audio amplification, and oscillator circuits. Its transition frequency (fT) of 250MHz ensures reliable operation in high-frequency environments, making it a preferred choice for radio-frequency (RF) designs.  

The transistor features low noise and high gain, enhancing its effectiveness in sensitive amplification stages. Additionally, its small footprint allows for dense PCB layouts, making it ideal for modern portable and embedded electronics.  

Engineers often select the MMBTH11 for its balance of performance, size, and cost-effectiveness. While it is not intended for high-power applications, its efficiency in low-voltage, high-speed switching makes it a versatile component in consumer electronics, communication devices, and instrumentation circuits.  

When integrating the MMBTH11 into a design, proper biasing and thermal considerations should be observed to ensure optimal performance and longevity. Its datasheet provides essential parameters such as current gain (hFE) and power dissipation limits, which are crucial for reliable circuit implementation.  

Overall, the MMBTH11 remains a practical choice for designers seeking a compact, high-frequency transistor with dependable signal-handling capabilities.

Application Scenarios & Design Considerations

NPN RF Transistor

Alternative Part Number

  • MMBTA42 --: NPN high-voltage transistor in the same SOT-23 package with similar current rating; widely available and often used as a general replacement in switching applications.
  • PMBTA42 --: SOT-23 NPN high-voltage transistor with comparable electrical characteristics, offering a different series prefix for easy distinction from the original.
  • FMMT458 --: SOT-23 NPN transistor with similar voltage and current ratings, suitable as a functional substitute in many low-power switching circuits.
  • BSS138 --: Widely available N-channel MOSFET in SOT-23, similar small-signal switching role and pinout, good general-purpose substitute.
  • 2N7002 --: Standard SOT-23 N-channel MOSFET with comparable voltage and current ratings, commonly used where MMBTH11 is applied.
  • PMBFJ111 --: Small-signal N-channel JFET in SOT-23, functionally similar low-power switching/amplifier alternative when exact MMBTH11 is unavailable.

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