Relay driver circuit using ic uln2003 and its working. Stmicroelectronics seven darlington arrays,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Device information1 part number package body size nom. Diodes incorporated uln2002a uln2003a uln2004a high voltage. Otherwise, when the output transistor turns off, the current still flowing through the relays coil wont have a place to go, and as a result the voltage can become high enough to destroy the uln2803. The coil current of my relays is 84ma, so two relays would be at 168ma. Sep 16, 2011 the uln2803 is a small integrated circuit that contains 8 transistor driver channels. Uln2003 is a relay driver ic consisting of a darlington array. The device consists of eight npn darlington pairs that feature highvoltage outputs with commoncathode clamp diodes for switching inductive loads. All units feature integral clamp diodes for switching inductive loads. The uln2003a is an array of seven npn darlington transistors capable of 500 ma, 50 v output.
Uln2803,04apgafwg 1 20101203 toshiba bipolar digital integrated circuit silicon monolithic uln2803apg,uln2803afwg,uln2804apg,uln2804afwg manufactured by toshiba malaysia 8ch darlington sink driver the uln2803apg afwg series are high. Uln2003 datasheet, uln2003 datasheets, uln2003 pdf, uln2003 circuit. The data sheets do point out exactly what the diff is, but they are essentially both darlington arrays ganged together in a dip chip. The max4896 8channel relay driver offers builtin inductive kickback protection, drive for latchingnonlatching or dual.
Uln2803 datasheet, uln2803 pdf, uln2803 data sheet, uln2803 manual, uln2803. Stmicroelectronics seven darlington arrays,alldatasheet, datasheet, datasheet search site for. Uln2803 stepper motorrelay driver board,uln2803 driver board,uln2803 stepper motordriver board,uln2803 board, stepper motor driver board. Uln2803 relay driver working operation embetronicx. Uln2002a uln2003a uln2004a january 2017 document number. Today, i am going to give the introduction to uln2003. Order this document by uln2803 d uln2803 uln2804 octal high voltage, high current, opencollector outputs and free wheeling clamp diodes for transient.
Each channel has an input to a resistor connected to the base of a transistor and a 1 amp open collector output capable of handling up to about 30volts. Uln200x, ulq200x highvoltage, highcurrent darlington. It can be solenoid driver, relay driver and led driver. Relaydriver applications 2 applications relay drivers stepper and dc brushed motor drivers lamp drivers display drivers led and gas discharge line drivers logic buffers 3 description the ulx200xa devices are highvoltage, highcurrent darlington transistor arrays. In this device, eight darlington pairs of npn configuration are present that have the feature of high voltage outputs along with the commoncathode clamp diodes that is used to switch inductive loads. Uln2803apg,uln2803afwg,uln2804apg,uln2804afwg manufactured. Schematics each driver uln2803apg afwg uln2804apg afwg note. All units feature integral clamp diodes for switching inductive. The max4896 8channel relay and load driver is designed for medium voltage applications up to 50v. It is basically a relay driver ic and it is a darlington array having high voltages and high currents as well. Uln2803a stmicroelectronics discrete semiconductor. We all know that the transistors are used to amplify the current but here darlington transistor pairs are used inside the ic to make the required amplification. Relaydriver applications compatible with uln2800a series applications include relay drivers, hammer drivers, lamp drivers, display drivers led and gas 2 applications discharge, line drivers, and logic buffers. The suffix g appended to the part number represents a lead.
Marko, the biggest difference is tha additional channel and the diode to protect from a spike. This device is offered in a 20pin, 5mm x 5mm tqfn package, resulting in substantial boardspace savings. This dip chip contains 8 drivers that can sink 500ma from a 50v supply and has kickback diodes included inside for driving coils. The uln2803a is a highvoltage, highcurrent darlington. The uln2803 consists of 8bit ttlinput npn darlington sink drivers. Uln2003 pdf, uln2003 description, uln2003 datasheets, uln2003. D compatible with uln2800a series descriptionordering information. Onsemi, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Uln2803apg features of relay driver ic uln2803 uln2803 application note application notes uln2803 uln2803 application ic uln2803 application circuit of uln2803 toshiba uln2803apg uln2803 sol18p3001. Relay driver circuit using ic uln2003 with applications elprocus.
This ic belongs to the family of uln200x ics and various types of this family interface to various logic families. Uln2803a bipolar bjt transistor array 8 npn darlington 50v 500ma 2. Onsemi, alldatasheet, datasheet, datasheet search site for electronic. Uln2803 is a highvoltage and highcurrent darlington transistor array and is mainly used as a relay driver with an ability to handle 8 relays at a. Applications include relay drivers, hammer drivers, lamp drivers, display drivers led and gas discharge, line drivers, and logic buffers. Relay driver circuit using uln2003 and its applications. Uln2803 datasheet, uln2803 datasheets, uln2803 pdf, uln2803 circuit. The relay driver circuit using uln2003 is given below. It is made up of seven open collector darlington pairs having common emitter which shows uln2003 has a capability of handling seven. The uln2803a allows 20300ma per channel, so i assume this would be ok, correct. D compatible with uln2800a series description ordering information. In english, the chip takes low level signals tll, cmos, pmos, nmos which operate at low voltages and low currents and. The input and output parasitic diodes cannot be used as clamp diodes.
The datasheet of uln2803 specifies that this chip is a high current, high voltage darlington transistor array. With a broad portfolio offering different driver topologies high side, low side and configurable switches, a standardized spi. Onsemi octal peripheral driver arrays,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. The uln2803 ic consists of eight npn darlington pair which provides the proper current amplification required by the loads. They are available also in small outline package so16 as uln2001d12002d12003d1 2004d1. Pricing and availability on millions of electronic components from digikey electronics. Each of the collectors has a reverse biased diode connected to a common vcc pin that provides inductive spike protection. I2coc805s, i2c bus extender uln2803 oc driver pcf8574. Sep 03, 2012 edgefx provides a video tutorial on relay driver uln2003 circuit ic pin description and used to drive relay switch on and off. Uln2803 pdf, uln2803 description, uln2803 datasheets. The uln2003a is a highvoltage, highcurrent darlington transistor array consisting of seven npn darlington pairs that feature highvoltage outputs with commoncathode clamp diodes for switching inductive loads.
Uln2803 datasheet, uln2803 pdf, uln2803 data sheet, uln2803 manual, uln2803 pdf, uln2803, datenblatt, electronics uln2803, alldatasheet, free, datasheet, datasheets. Electronic components datasheet search english chinese. It is made up of seven open collector darlington pairs with common emitter. This ic is widely used to drive high loads such lamps, relays, motors etc. The uln2803 chips take the lowlevel signals at input side i. Jun 09, 2017 some of the other applications of uln2003 include logic buffers, lamp drivers, line drivers, led display, motor driver circuits etc. I would like to use the uln2803a as a relay driver. Octal peripheral driver arrays, uln2803 datasheet, uln2803 circuit, uln2803 data sheet. We can use seven relays with relay driver circuit using uln2003 and the relay driver circuit using uln2803 enables to use eight relays. Introduction to uln2803 pin configuation, how to use it. The uln2803apafw series are highvoltage, highcurrent. This is a high voltage, high current driver board made using the ic uln2803, which consists of 8 npn darlington transistor array with common cathode clamp diodes for switching inductive loads. The uln2803 is a small integrated circuit that contains 8 transistor driver channels.
The io 24 uln2803 switch board shown below in diagram 1 is a very useful accessory. Edgefx provides a video tutorial on relay driver uln2003 circuit ic pin description and used to drive relay switch on and off. A uln2803 is an integrated circuit ic chip with a high voltagehigh current darlington transistor array. Uln2803 datasheetpdf 1 page artschip electronics co.
Uln2003a darlington transistor array circuit examples. Uln2803a stmicroelectronics discrete semiconductor products. We can use seven relays with relay driver circuit using uln2003 and the relay driver circuit using uln2803 enables to. A pair of darlington is an arrangement of two bipolar transistors. Relay driver circuit using ic uln2003 with applications. Octal lowside relay driver the ncv7240 is an automotive eight channel low. In the same family are uln2002a, uln2004a, as well as ulq2003a and ulq2004a, designed for different logic input levels. In this circuit diagram, the pic microcontroller is providing a signal to 4 relays through relay driver ic uln2003. If the uln2803 would turn on 8 relays with a lot of current, that current is going through the board of the arduino. Uln2803 stepper motorrelay driver board,uln2803 driver board,uln2803 stepper motordriver board,uln2803 board, stepper motor driver board this is a high voltage, high current driver board made using the ic uln2803, which consists of 8 npn darlington transistor array with common cathode clamp diodes for switching inductive loads. Relay driver applications compatible with uln2800a series descriptionordering information the uln2803a is a highvoltage, highcurrent darlington transistor array.
Relay driver uln2003 relay driver ic electrical projects. It is difficult to use a number of relays with transistors, so, relay driver ic uln2003a can be used for availing more relays. It allows you to interface ttl signals with higher voltagecurrent loads. The uln2803a device is a 50 v, 500 ma darlington transistor array. The relay driver uln2003 ic is a high voltage and current darlington array ic, it comprises of 7open collector darlington pairs with common emitters. The uln2001a2002a2003a and 2004a are supplied in a 16pin dip package with a copper leadframe to reduce thermal resistance. The cheap i2c bus open collector digital output is an i2c extender using i2c controller pcf8574 and oc driver uln2803. Output control is via a spi port and offers convenient reporting of faults for open load or short to. Relay driver applications compatible with uln2800a series applications include relay drivers, hammer drivers, lamp drivers, display drivers led and gas 2 applications discharge, line drivers, and logic buffers. Uln2801a, uln2802a, uln2803a, uln2804a 1414 docid1536 rev 4 important notice please read carefully stmicroelectronics nv and its subsidiaries st reserve the right to make changes, corrections, enhancements, modifications, and. Here we will explore using the versatile uln2003a darlington transistor array with a typical microcontroller such as arduino. It features commoncathode flyback diodes for switching inductive loads.
A transistor works best as a switch when it is connected with a common emitter configuration, meaning the emitter of the bjt must be always connected directly with ground line. Transistor relay driver circuit with formula and calculations. Applications include relay, hammer, lamp and display led drivers. But can i connect two in parallel as long as i dont exceed the 300ma per. This device is offered in a 20pin, 5mm x 5mm tqfn package, resulting in substantial board space savings. Here the ground refers to the negative line for an npn and the positive line for a pnp bjt.
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