ULN2003AIPWRG4

Transistors - Bipolar (BJT) - Arrays

The ULN2003AIPWRG4 is a monolithic array of seven NPN Darlington transistors capable of 500 mA, 50 V output. It is designed to provide a medium power driver that is suitable for a variety of high voltage, medium current applications. The ULN2003AIPWRG4 is a versatile, highly integrated, high power IC which can be used as a driver for DC motors, LEDs, and other high voltage/high current devices.

Application Field

The ULN2003AIPWRG4 is suitable for implementing high- and low-side switches in automotive, home appliance, medical, and telecom applications. It is also popular for controlling relatively low power motors that work in environments like disc drives, robotics, and security systems. Additionally, it can be used as a medium power interface driver in low bandwidth applications such as capacitive touchscreens, RFID, and OLED displays.

The ULN2003AIPWRG4 is available in small packages like SOIC, TSSOP and QFN, and as a result can be used in applications having space constraints. Its wide operating temperature range of -40℃ to 85℃ also adds to its suitability in applications that would require a wide temperature operating range.

Working Principle

The ULN2003AIPWRG4 follows a simple linear logic, where logic high ( > 2V ) at the input is directly converted to a high current sinking mode ( > 500 mA) at the output. This high current is greater than the sourcing capability of the microcontroller itself, and thus the ULN2003AIPWRG4 can provide high level current to drive devices like motors and LEDs.At the driver input, 7 darlington transistors are arranged to provide a linear voltage to current amplifying topology. This effectively reduces the input threshold from around 0.7 V (at which a typical logic NPN transistor starts conducting) to 0.4 V, making it easier for the logic to drive the driver. The output side of the ULN2003AIPWRG4 also provides open collector outputs which can be tied together to create a more powerful drive.

For more complex power management tasks, the PWM feature of the ULN2003AIPWRG4 can be used to simultaneously control the average output current and the switching frequency. The error flag pin of the ULN2003AIPWRG4 also gives an indication of whether the device is in an overcurrent or thermal overload condition.

To sum up, the ULN2003AIPWRG4 is a versatile, compact and reliable driver IC which can be used in a wide range of applications requiring medium power and high current capability.