ULN2002A Darlington Transistor Array from STMicroelectronics
The ULN2002A device is a high-voltage, high-current Darlington transistor array designed by STMicroelectronics. It consists of seven NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of each Darlington pair is 500 mA, and the entire array can handle up to 50 V.
Engineered for interfacing between low-level logic circuitry and multiple peripheral power loads, the ULN2002A is ideal for applications that require direct control of high-current loads such as relays, solenoids, stepping motors, and other high-current/high-voltage devices. This array is specifically designed to be compatible with 14-25V PMOS devices.
The ULN2002A features a series base resistor for each Darlington pair that makes the device compatible with PMOS logic outputs where higher input voltages are typical. This resistor ensures that the Darlington pair is properly driven, thus providing a high degree of reliability in operation. The device is supplied in a 16-pin DIP package, which is suitable for through-hole mounting, making it easy to integrate into a wide range of electronic circuits.
With its integrated suppression diodes for inductive loads, the outputs of the ULN2002A can safely drive inductive loads such as motors and relays without the risk of damaging the device due to the inductive voltage spikes that occur when the current to an inductive load is suddenly interrupted. This feature significantly simplifies the design of the control circuitry required for such loads.
STMicroelectronics' ULN2002A is characterized by its robustness, high efficiency, and ease of use. It is widely used in a variety of applications, from simple home appliances to complex industrial automation systems. By providing a reliable and straightforward solution for driving high-power loads, the ULN2002A continues to be a go-to component for designers and engineers seeking to optimize their electronic designs.
For more detailed information, including the full datasheet, application notes, and design resources, interested parties are encouraged to visit the official STMicroelectronics website or contact their local STMicroelectronics sales office.
