The ULN200X family of components comprises transistor arrays for a number of different applications and each of these variants has different features and ratings. Like most components, the ULN2003 transistor array is part of a family of components produced by a range of manufacturers. Here’s where you can find a ULN2003 datasheet, CAD data, and sourcing information to help you create your PCB. These components are excellent choices for working with high voltage analog systems and can be brought into complex power regulation circuitry, discrete amplifiers, and other applications where low-level currents need high gain. One popular option is the ULN2003, which is designed to interface with TTL and CMOS devices. Rather than build out a Darlington pair from discrete transistors, you can use a transistor array in a standard surface-mount or through-hole package. In essence, these components act like a transimpedance amplifier, which is then used to drive a high impedance load, such as an ADC. Your typical response might be to use an op-amp array for applications involving multiple signals from sensors, but you have another option to amplify signals and send them to a downstream load with high impedance.Ī Darlington pair is one type of circuit that provides very high gain for low-level currents. Your signals need to be collected and amplified before you can use the results in a larger digital system. The signal type also varies from sensor to sensor with different frequencies and signal levels. IoT products, environmental products, and anything else that needs analog sensor fusion will operate at a variety of signal levels. Here’s where you can find a ULN2003 datasheet. 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.Instead of using multiple discrete transistors to build Darlington pairs, you can use a ULN2003 or one of its variants.
#Uln2003 darlington transistor array series
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.
#Uln2003 darlington transistor array drivers
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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