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BDX54C Datasheet PDF – TO-220, PNP Transistor

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Part Number: BDX54C

Function: -100V, -8A, PNP Epitaxial Silicon Transistor

Package: TO-220 Type

Manufacturer: Fairchild Semiconductor

Image

BDX54C PNP Transistor Fairchild

Description

The BDX54C is a PNP epitaxial silicon power Darlington transistor designed for high-voltage and high-current applications, with a collector-emitter voltage rating of -100V and current capability up to -8A. It features a Darlington configuration for high current gain and efficient amplification, making it suitable for power switching and linear operation. This device is commonly used in audio amplifiers, motor drivers, and general-purpose high-power control circuits.

Features

  • PNP Darlington transistor with high current gain
  • High voltage capability up to -100V
  • Continuous collector current up to -8A
  • Complementary pair with BDX53 series
  • Suitable for linear and switching applications
  • Robust power handling capability

Pinouts

BDX54C datasheet

Absolute Maximum Ratings (Tc = 25 °C)

Parameter Symbol Value Unit
Collector-Base Voltage VCBO -100 V
Collector-Emitter Voltage VCEO -100 V
Emitter-Base Voltage VEBO -5 V
Collector Current (DC) IC -8 A
Power Dissipation PC 60 W

How to Choose This Part

  • Select for high-current PNP switching or amplification requirements
  • Ideal when high gain is needed with minimal base drive
  • Suitable for complementary pairing with BDX53 series
  • Evaluate thermal design due to significant power dissipation
  • Consider saturation voltage impact in efficiency-sensitive designs

Applications

  • Hammer drivers and actuator control
  • Audio amplifier circuits
  • Power linear regulation
  • Switching power stages
  • Industrial control systems

Alternative / Equivalent Products

  • BDX53C complementary NPN Darlington transistor
  • TIP127 PNP Darlington transistor
  • MJE2955 PNP power transistor
  • MJ2955 high-power PNP transistor
  • TIP125 Darlington transistor alternative

 

BDX54C Datasheet PDF Download


BDX54C pdf

Other data sheets are available within the file: BDX54, BDX54A, BDX54B

12AT7 PDF Datasheet – Triode Vacuum Tube ( ECC81 )

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Part Number: 12AT7

Function: Triode Vacuum Tube, Receiving Valve

Package: 9 Pin Type

Manufacturer: BRIMAR

Images:12AT7 pdf

Description

A triode vacuum tube is a type of electron tube, also known as a thermionic valve or vacuum tube, that contains three basic elements: a cathode, a control grid, and an anode.

12AT7 (also known in Europe by the Mullard–Philips tube designation of ECC81) is a miniature 9-pin medium-gain (60) dual-triode vacuum tube popular in guitar amplifiers. It belongs to a large family of dual triode vacuum tubes which share the same pinout (EIA 9A), including in particular the very commonly used low-mu 12AU7 and high-mu 12AX7.

The 12AT7 has somewhat lower voltage gain than the 12AX7, but higher transconductance and plate current, which makes it suitable for high frequency applications.

This is a specific type of vacuum tube, also known as a thermionic valve or electron tube. It is a double triode tube, meaning it contains two independent triode sections in a single glass envelope. This tube belongs to the 9-pin miniature (Noval) tube family.

Application Circuit

12AT7 datasheet tube

The operation of a triode vacuum tube is based on the principle of thermionic emission. When a voltage is applied to the cathode, it heats up and emits electrons into the surrounding vacuum. The control grid, placed between the cathode and the anode, acts as an electrode that can modulate the flow of electrons from the cathode to the anode.

12AT7 PDF Datasheet