Uln2003 darlington transistor array8/10/2023 ![]() Pin 18 is the collector of first transistor.Pin 17 is the collector of second transistor.Pin 16 is the collector of third transistor.Pin 15 is the collector of fourth transistor.Pin 14 is the collector of fifth transistor.Pin 13 is the collector of sixth transistor.Pin 12 is the collector of seventh transistor.Pin 11 is the collector of eighth transistor.node of common cathode which is used for the fly-back diodes. Pin 9 is the emitter as well as ground of all transistors.Pin 8 is the base of eighth transistor.Pin 7 is the base of seventh transistor. ![]() Pin 4 is the base of fourth transistor.Pin 2 is the base of second transistor.In order to achieve the higher capability of current, Darlington pairs of np-n configuration are connected in parallel. The collector current rating for each np-n Darlington pair is about 500 mA. In this device, eight Darlington pairs of np-n configuration are present that have the feature of high voltage outputs along with the common-cathode clamp diodes that is used to switch inductive loads. The datasheet of ULN2803 specifies that this chip is a high current, high voltage Darlington transistor array. UNL2003 interfacing with microcontroller.So in this article, we will discuss pin configuration of ULN2803, features as well as specification, how & where to use this and in the last, we will highlight some applications that are developed by using this chip. TTL and make use of that low-level signal in switching off loads of higher voltage present at the output side. The ULN2803 chips take the low-level signals at input side i.e. All these chips operate at either 0 volts or 5 volts thus these are not capable of driving loads of high inductive power. Some of these chips are CMOS, NMOS, TTL, and PMOS. Usually, the chips being used operate on the low-level signals. The required input current of the ULx2004A device is below that of the ULx2003A devices, and the required voltage is less than that required by the ULN2002A device.Today in this article, we are going to introduce you to ULN2803 which is high current as well as high voltage Darlington transistor array. The ULx2004A devices have a 10.5-kΩ series base resistor to allow operation directly from CMOS devices that use supply voltages of 6 V to 15 V. The ULx2003A devices have a 2.7-kΩ series base resistor for each Darlington pair for operation directly with TTL or 5-V CMOS devices. Each input of this device has a Zener diode and resistor in series to control the input current to a safe limit. The ULN2002A device is designed specifically for use with 14-V to 25-V PMOS devices. For 100-V (otherwise interchangeable) versions of the ULx2003A devices, see the SLRS023 data sheet for the SN75468 and SN75469 devices. Applications include relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers, and logic buffers. The Darlington pairs can be paralleled for higher current capability. The collector-current rating of a single Darlington pair is 500 mA. Each consists of seven NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. ![]() The ULx200xA devices are high-voltage, high-current Darlington transistor arrays.
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