ULN2075B

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The ULN2075B is an array of eight high-voltage, high-current Darlington transistors. It is designed to interface for high-voltage, high-current and low-voltage, low-current applications. The ULN2075B can be used in applications like relays, analog circuit design, power line protection, power conversion, motor control, interfacing and signal conditioning.

Typical applications of ULN2075B include motor control, power line and power cycle protection, controlling of relays, magnetic relays, and similar devices. The ULN2075B component can also drive loads such as solenoids, lamps, AC inductive loads, and motors. In many cases it provides a simple, cost effective way to interface logic signals to relatively large loads.

The ULN2075B contains eight individual Darlington transistor arrays with integral suppression diodes to reduce turn-on and turn-off transients. Each Darlington pair consists of a monolithic Darlington pre-driver and output transistor pair. The components have a wide operating voltage range of 2.7 to 30V and are capable of sinking 500mA. The parts are also characterized for 400mA continuous sinking current.

The ULN2075B is built on an 8-pin SOP (Small Outline Package) and each Darlington pair has an open collector output. All outputs are protected against back EMF, transients, and shorts to ground. The ULN2075B combines low amperage operation and efficient use of circuitry, while allowing a degree of flexibility to be achieved with the device.

The ULN2075B works by using two separate transistors. A high-side transistor is usually used for the output stage, which is connected to the load. Then a low-side transistor (such as an NPN or PNP) is connected to the other side of the load. This arrangement creates a voltage drop across the load and allows current flow to the load. The high-side transistor provides the necessary biasing to drive the load, whereas the low-side transistor provides the current limitation to protect the load from excessive current.

The ULN2075B offers the advantages of enhanced protection for the load relative to a standard Darlington array. It provides improved thermal dissipation characteristics and higher voltage capability. The ULN2075B also provides a cost-effective solution for small current loads and with its wide operating voltage range and relatively low cost, it is ideal for small motor control applications.

In summary, the ULN2075B is a versatile and cost-effective component for various applications. It is an array of high-current, high-voltage, Darlington transistors which provides improved thermal dissipation and higher voltage capabilities. Applications of this component include motor control, power line and power cycle protection, controlling of relays, magnetic relays, and solenoid loads. It is also characterized for 400mA continuous sinking currents, a wide operating voltage range of 2.7 to 30V, and integral suppression diodes to reduce turn-on and turn-off transients.

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