Timer Circuits

Timer circuits are used to control sequences of events in electronic systems. They work by changing the circuit from one state to another in advance. 


Applications for timer circuits

You can use timer circuits for basic timing functions, like turning a light on for a certain amount of time or creating a flashing light. They can also be used to create musical notes of a particular frequency.


555 timers

The most widespread type of timer circuit is the 555 timer, which is made up of an eight-pin dual in-line package containing 25 transistors, two diodes and 16 resistors. They can be used as either astable or monostable timers: 

  • Monostable: Often called a one-shot timer, a monostable timer stays on for a certain length of time and then turns off. The timing process starts when the timer is switched on.
  • Astable: An astable timer is switched on to provide a constant on/off digital output. The timer can be used make an LED flash, and the rate of flashing is determined by a capacitor in the circuit.

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Omschrijving Prijs Mounting Type Timer Type Package Type Number of Internal Timers Pin Count Maximum Input Frequency Minimum Operating Supply Voltage Maximum Operating Supply Voltage Minimum Operating Temperature Maximum Operating Temperature Maximum Quiescent Current Maximum Low Level Output Current Maximum High Level Output Current Maximum Propagation Delay Time @ Maximum CL
RS-stocknr. 921-5951
FabrikantnummerICM7242IPAZ
5,15 €
Each (In a Pack of 2)
Aantal stuks
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS-stocknr. 662-3999
FabrikantnummerNE555PWR
0,23 €
Each (In a Pack of 10)
Aantal stuks
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS-stocknr. 190-5914
FabrikantnummerDS1100LZ-50+
FabrikantMaxim Integrated
5,37 €
Each (In a Pack of 2)
Aantal stuks
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS-stocknr. 921-0745
FabrikantnummerNA555S-13
FabrikantDiodesZetex
0,312 €
Each (In a Pack of 30)
Aantal stuks
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C - 200mA -200mA -
RS-stocknr. 197-7495
FabrikantnummerSE555JG
8,538 €
Each (In a Tube of 50)
Aantal stuks
- - CDIP 1 8 - - - - - - - - -
RS-stocknr. 662-4009
FabrikantnummerTLC555QDR
0,576 €
Each (In a Pack of 10)
Aantal stuks
Surface Mount Standard SOIC 1 8 2MHz 5 V 15 V -40 °C +125 °C - 100mA -10mA -
RS-stocknr. 190-5908
FabrikantnummerDS1100LZ-20+
FabrikantMaxim Integrated
5,37 €
Each (In a Pack of 2)
Aantal stuks
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS-stocknr. 196-8887
FabrikantnummerICM7555CBAZ-T
0,221 €
Each (On a Reel of 2500)
Aantal stuks
- Standard SOIC 1 8 1MHz - - - - - - - -
RS-stocknr. 485-8904
FabrikantnummerHEF4541BT,512
FabrikantNexperia
0,431 €
Each (In a Pack of 10)
Aantal stuks
Surface Mount Programmable SOIC 1 14 36MHz 3 V 15 V -40 °C +85 °C - 4.2mA -4.2mA 1150 ns@ 5 V
RS-stocknr. 145-0016
FabrikantnummerCD4536BEE4
0,193 €
Each (In a Tube of 25)
Aantal stuks
Through Hole Programmable PDIP 1 16 - 3 V 18 V -55 °C +125 °C 0.1mA 4.2mA -4.2mA 8000 ns @ 5 V
RS-stocknr. 698-7127
FabrikantnummerDS1682S+
FabrikantMaxim Integrated
5,08 €
Each
Aantal stuks
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
RS-stocknr. 197-7393
FabrikantnummerNE555DR
0,214 €
Each (In a Pack of 50)
Aantal stuks
- - SOIC 1 8 - - - - - - - - -
RS-stocknr. 197-7394
FabrikantnummerNE556DR
0,119 €
Each (On a Reel of 2500)
Aantal stuks
- - SOIC 1 14 - - - - - - - - -
RS-stocknr. 662-4687
FabrikantnummerTLC556ID
1,222 €
Each (In a Pack of 5)
Aantal stuks
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS-stocknr. 190-4882
FabrikantnummerDS1100LZ-200+
FabrikantMaxim Integrated
4,014 €
Each (In a Tube of 100)
Aantal stuks
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS-stocknr. 922-4794
FabrikantnummerTLC556CDR
0,497 €
Each (On a Reel of 2500)
Aantal stuks
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS-stocknr. 191-4247
FabrikantnummerICM7556IPD+
FabrikantMaxim Integrated
3,971 €
Each (In a Tube of 25)
Aantal stuks
Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -
RS-stocknr. 662-4003
FabrikantnummerTLC556CDR
1,076 €
Each (In a Pack of 5)
Aantal stuks
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS-stocknr. 662-4674
FabrikantnummerTLC551CD
1,79 €
Each (In a Pack of 5)
Aantal stuks
Surface Mount Standard SOIC 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
RS-stocknr. 761-6104
FabrikantnummerLMC555CMM/NOPB
1,08 €
Each (In a Pack of 5)
Aantal stuks
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
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