I. ULN2003 Introduction
ULN2003 is a high withstand voltage, high current composite transistor array, consisting of seven silicon NPN composite transistors, each pair of Darlington is connected in series with a 2.7K base resistor, it can be directly connected to TTL and CMOS circuits at 5V operating voltage, and can directly process the data that originally needed a standard logic buffer to process.
ULN2003 Features.
The ULN2003 has a 2.7K base resistor in series with each pair of Darlingtons, and it can be directly connected to TTL and CMOS circuits at 5V operating voltage, allowing direct processing of data that would otherwise require a standard logic buffer to process.
The ULN2003 operates at high voltages and high currents, with potting currents up to 500mA, and is capable of withstanding 50V at off-state, with outputs that can also operate at high load currents in parallel.
The ULN2003 is available in DIP-16 or SOP-16 plastic packages.
Pin 1: CPU pulse input, the port corresponds to a signal output.
Pin 2: CPU pulse input.
Pin 3: CPU pulse input.
Pin 4: CPU pulse input.
Pin 5: CPU pulse input.
Pin 6: CPU pulse input.
Pin 7: CPU pulse input.
Pin 8: Ground.
Pin 9: This pin is the common terminal of the negative terminal of the 7 internal current-continuing diodes, and the positive terminal of each diode is connected to the collector of each Darlington tube. When used for inductive loads, this pin is connected to the positive terminal of the load power supply to achieve the role of current continuation. If this pin is grounded, it is actually the collector of the Darlington tube to ground.
Pin 10: Pulse signal output, corresponding to the signal input of pin 7.
Pin 11: Pulse signal output, corresponding to the signal input of pin 6.
Pin 12: Pulse signal output, corresponding to the signal input of pin 5.
Pin 13: Pulse signal output, corresponding to pin 4 signal input.
Pin 14: Pulse signal output, corresponding to pin 3 signal input.
Pin 15: Pulse signal output, corresponding to 2-pin signal input.
Pin 16: Pulse signal output, corresponding to 1-pin signal input.
ULN2003 role
ULN2003 is a high current drive array, mostly used in control circuits such as microcontrollers, smart meters, PLCs, digital output cards, etc. It can directly drive loads such as relays.
Input 5V TTL level, output up to 500mA/50V.
ULN2003 is a high withstand voltage, high current Darlington series, consisting of seven silicon NPN Darlington tubes. The circuit features the following: Each pair of ULN2003 Darlingtons is connected in series with a 2.7K base resistor, and it can be directly connected to TTL and CMOS circuits at 5V operating voltage, allowing direct processing of data that originally required a standard logic buffer to process.
ULN2003 is a series of high-voltage and high-current Darlington transistor arrays with high current gain, high operating voltage, wide temperature range, and strong load carrying capability, which are suitable for various systems requiring high-speed and high-power driving.
ULN2003 alternatives: ULN2003A, ULN2003AN, ULN2002AN...
II ULN2803 introduction
ULN2803, using AP=DIP18, AFW=SOL18 package method. The eight-way NPN Darlington connection transistor array series is particularly suitable for interfacing between low logic level digital circuits (such as TTL, CMOS or PMOS/NMOS) and higher current/voltage requirements, and is widely used in lamps, relays, print hammers or other similar loads in computers, industrial and consumer products. The ULN2803 is designed to be compatible with the standard TTL family, while the ULN2804 is best suited for 6 to 15 volt high level CMOS or PMOS.
ULN2803 features
Darlington tube driver
Contains 8 NPN Darlington tubes
High voltage withstand, high current
Lead-free/RoHS certified
Input resistance: 2.7k (Ω)
Recommended input voltage: 5 (V)
Temperature range: -40℃～+85℃
Package specification: AFW:Tape&Reel
Tape & Reel AP:Tube
Do not exceed the limit of the current of each driver
ULN2803 working principle
ULN2803 Darlington tube IC, also known as high-power triode, use and triode control circuit is similar, plus diode is to control inductive loads such as relays, stepper motors, solenoid valves and other devices, reverse electric potential instantly breakdown ULN2803 Darlington tube, providing a drain path. If the control of inductive loads, it is best and a diode at both ends of the inductive load to prevent breakdown ULN2803.
ULN2803 Darlington tube IC contains 8 Darlington transistors inside. 1 --- 8 low level control output, 8 Darlington transistors you can see as 8 P-type transistors to use, 9 pin ground, 10 pin connected to the positive VCC power supply, 11 --- 18 to control the load end, the other end of the load connected to the positive VCC power supply.
III ULN2003 and uln2803 difference
ULN2003 is a seven-fold Darlington array, uln2803 is an eight-fold Darlington array. The two chips input voltage range is the same, the output voltage, the same current. Is the latter more than one way. A piece of 2803 can control two 4-phase stepper, but a piece of the 2003 channel is not enough, can only control a 4-phase stepper.
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