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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Description Price 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 Stock No. 190-4882
Mfr. Part No.DS1100LZ-200+
$8.18
Each (In a Tube of 100)
units
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS Stock No. 191-4848
Mfr. Part No.ICM7556IPD+
$9.26
Each (In a Pack of 5)
units
Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 923-1571
Mfr. Part No.ICM7242IPAZ
$8.095
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS Stock No. 662-4674
Mfr. Part No.TLC551CD
$3.15
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 921-5652
Mfr. Part No.CS82C54-10Z96
$19.60
Each
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS Stock No. 188-9229
Mfr. Part No.TS556IDTTR
$0.911
Each (On a Reel of 2500)
units
Surface Mount - SO 2 14 2.7MHz 2 V 16 V -40 °C +125 °C - 8mA -2mA 100 ns @ 10 pF
RS Stock No. 190-4886
Mfr. Part No.ICM7555ESA+
$2.92
Each (In a Tube of 100)
units
Surface Mount Astable, RC Monostable SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
RS Stock No. 196-8889
Mfr. Part No.ICM7555IBAZ-T
$0.441
Each (On a Reel of 2500)
units
- Standard SOIC 1 8 1MHz - - - - - - - -
RS Stock No. 825-5340
Mfr. Part No.TPL5000DGST
$2.74
Each (In a Pack of 5)
units
Surface Mount Programmable VSSOP 1 10 - 1.8 V 5 V -40 °C +105 °C - - - -
RS Stock No. 190-5939
Mfr. Part No.ICM7555ESA+
$3.58
Each (In a Pack of 10)
units
Surface Mount Astable, RC Monostable SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
RS Stock No. 162-7010
Mfr. Part No.NE555PWR
$0.131
Each (On a Reel of 2000)
units
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 921-5677
Mfr. Part No.IS82C54-10Z
$35.47
Each
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS Stock No. 145-0368
Mfr. Part No.SE555D
$0.589
Each (In a Tube of 75)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 190-4883
Mfr. Part No.DS1100LZ-50+
$8.16
Each (In a Tube of 100)
units
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS Stock No. 660-7761
Mfr. Part No.SE555D
$0.834
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 923-1470
Mfr. Part No.IS82C54-10Z
$35.445
Each (In a Tube of 37)
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS Stock No. 145-4759
Mfr. Part No.MC1455BDR2G
$0.304
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS Stock No. 196-8891
Mfr. Part No.ICM7555IBAZ-T
$1.022
Each (In a Pack of 25)
units
- Standard SOIC 1 8 1MHz - - - - - - - -
RS Stock No. 190-4885
Mfr. Part No.ICM7242IPA+
$7.17
Each (In a Tube of 50)
units
Through Hole Fixed, Programmable PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
RS Stock No. 165-8349
Mfr. Part No.NA555S-13
$0.23
Each (On a Reel of 2500)
units
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C - 200mA -200mA -
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