ULN2069B

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ULN2069B is an integrated array of high voltage darlington transistors designed to switch bipolar and unipolar loads with positive logic input levels. The device contains eight 500-mA rated Darlington transistors with common emitters. Each of its inputs is preceded by an open-collector diode for direct drive from TTL, CMOS or other digital logic. In applications where the input voltage level is inadequate to switch on the ULN2069B, a pull-up resistor can be connected across the input terminal to ground.

No external base resistors are required for operation. The devices are intended for interfacing between low-power digital logic control levels and higher power loads such as incandescent lamps, relays, and small motors. The ULN2069B devices have a wide range of applications and can be used to switch unipolar or bipolar loads such as resistive, capacitive, inductive and dynamic. The ULN2069B array can also be used as an amplifier, allowing controlled operation with a wide range of voltages and frequencies.

The ULN2069B array is designed with shielded substrate integrated circuits to reduce radiation and provide a line of noise and interference suppression. This high voltage device is fabricated using a Low-Emittance Self-Heating (LESH) bipolar transistor technology that features a low on-resistance, fast switching and high current gain. The ULN2069B device is rated for operating voltages up to 500 volts DC and is available in a variety of packages including a surface-mount version.

The ULN2069B works by using negative logic. When the input voltage is high, the output is low and when the input voltage is low, the output voltage is high. This is accomplished by connecting the Darlington transistors between the power supply and the output. When the input voltage is low, the Darlington transistors are open. This allows current to flow from the power supply to the output, causing the output voltage to be high. When the input voltage is high, the Darlington transistors are connected, which causes current to be diverted away from the output to ground, thus causing the output voltage to be low.

The ULN2069B array can also be used to drive logic circuits, as it provides the opposite logic level to that of the input. By connecting the input of the ULN2069B to a logic circuit, the ULN2069B will produce the opposite logic level at its output, thus allowing the logic circuit to be driven. The ULN2069B array can also be used as an amplifier, allowing controlled operation with a wide range of voltages and frequencies.

The ULN2069B array is designed to provide compatibility between low-power control levels and higher-power loads, and to increase the reliability of control systems by providing interference and noise suppression. The device is suitable for a variety of applications including interfacing between TTL, CMOS or other digital logic and loads such as incandescent lamps, relays, and small motors. The ULN2069B is also a great tool for amplifying low level signals and controlling high voltage loads with a range of input voltages.

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