Transistor TIP126

Transistor TIP126 PNP Darlington Power Transistor – 5A 80V TO-220 of Transistor TIP126

The TIP126 transistor is a high-performance PNP Darlington power transistor designed for linear amplification and low-speed switching applications. Housed in a durable TO-220 package, the TIP126 is widely used in motor drivers, relay control circuits, LED drivers, audio amplifiers, power supplies, and industrial switching systems. It supports up to 5A collector current and 80V collector-emitter voltage, making it ideal for medium to high-power electronic projects.

Its high DC current gain (hFE up to 1000–2500) allows efficient switching with a small base current, reducing the need for complex driver stages. The low saturation voltage improves performance in power control circuits, while the built-in Darlington pair design ensures stable and reliable operation. Engineers and technicians commonly use the TIP126 as the complementary PNP pair for TIP121/TIP122 series transistors.

The TIP126 PNP transistor is perfect for use in inverters, battery chargers, robotics, DIY electronics, UPS circuits, and automation boards. Its robust thermal handling and easy mounting make it a trusted choice for repair technicians and electronics manufacturers.

Key Features of Transistor TIP126

• PNP Darlington Power Transistor
• Collector Current: 5A
• Collector-Emitter Voltage: 80V
• High Gain hFE: 1000–2500
• Package: TO-220
• Low-speed switching and amplifier use
• Suitable for power control applications

• IC TL489 – 5-Step Analog Level Detector IC

  The IC TL489 is a 5-step analog level detector integrated circuit designed for converting analog voltage levels into digital step outputs. It contains five internal comparators with a precision reference network, making it ideal for signal level indication, LED bar displays, low-precision meters, warning circuits, and automatic range switching applications. According to the datasheet, it detects analog input signals in 200mV increments, with all five outputs active at around 1000mV input.

  This IC features high input impedance (100kΩ typical), ensuring minimal loading on the input signal source. Its open-collector outputs can sink up to 40mA and withstand voltages up to 18V, allowing it to directly drive LEDs, small lamps, TTL, CMOS, and other logic circuits. The built-in hysteresis of approximately 10mV on each comparator helps prevent unstable switching and noise-related flickering.

  The TL489 IC is widely used in battery level indicators, voltage monitoring systems, audio level meters, warning signal indicators, analog-to-digital step conversion, pulse shaping, feedback regulators, and automotive electronics. Its 8-pin DIP package, simple circuit design, and reliable analog detection make it a practical choice for technicians, hobbyists, and electronics repair professionals.

  Key Features

  • 5 internal comparators
  • 200mV step analog detection
  • High input impedance
  • Open-collector outputs
  • 40mA output sink capability
  • Supply voltage: 10V to 18V
  • DIP-8 package
  • Low-cost analog level monitoring solution

  Applications

  • LED level indicators
  • Battery voltage monitor
  • Audio VU meter circuits
  • Warning and alarm systems
  • Industrial control circuits
  • Analog signal step detection
  • Consumer electronics repair

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