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. 662-4665
Mfr. Part No.SA556N
$0.754
Each (In a Pack of 5)
units
Through Hole Standard PDIP 2 14 - 4.5 V 16 V -40 °C +85 °C 30mA 200mA -200mA -
RS Stock No. 922-4794
Mfr. Part No.TLC556CDR
$0.916
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 662-4668
Mfr. Part No.CD4541BM
$0.662
Each (In a Pack of 10)
units
Surface Mount Programmable SOIC 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns@ 5 V
RS Stock No. 121-8948
Mfr. Part No.TLC555ID
$1.08
Each (In a Tube of 75)
units
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 162-8608
Mfr. Part No.LMC555IM/NOPB
$2.21
Each (In a Tube of 95)
units
Surface Mount Reset SOIC 1 8 3MHz 1.5 V 15 V -40 °C +125 °C - -10mA 50mA 100ns
RS Stock No. 662-4687
Mfr. Part No.TLC556ID
$2.26
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 162-7093
Mfr. Part No.TLC555QDR
$0.798
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 2MHz 5 V 15 V -40 °C +125 °C - 100mA -10mA -
RS Stock No. 662-4009
Mfr. Part No.TLC555QDR
$1.197
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 1 8 2MHz 5 V 15 V -40 °C +125 °C - 100mA -10mA -
RS Stock No. 145-7365
Mfr. Part No.TLC556MD
$2.74
Each (In a Tube of 50)
units
Surface Mount Standard SOIC 2 14 2MHz 5 V 18 V -55 °C +125 °C - 100mA -10mA -
RS Stock No. 145-1051
Mfr. Part No.CD4541BM
$0.603
Each (In a Tube of 50)
units
Surface Mount Programmable SOIC 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns @ 5 V
RS Stock No. 156-5697
Mfr. Part No.LTC6993CS6-4#TRMPBF
$3.781
Each (On a Reel of 500)
units
Surface Mount Monostable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 28 ns @ 5 pF
RS Stock No. 858-0891
Mfr. Part No.LTC6993CS6-4#TRMPBF
$4.89
Each (In a Pack of 5)
units
Surface Mount Monostable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 28 ns@ 5 pF
RS Stock No. 145-5776
Mfr. Part No.TLC556ID
$1.93
Each (In a Tube of 50)
units
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C 85 °C - 100mA -10mA -
RS Stock No. 662-4012
Mfr. Part No.TLC556IDR
$2.416
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 662-4699
Mfr. Part No.TLC556MD
$3.23
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 2 14 2MHz 5 V 18 V -55 °C +125 °C - 100mA -10mA -
RS Stock No. 145-5862
Mfr. Part No.TLC552CD
$3.657
Each (In a Tube of 50)
units
Surface Mount Monolithic SOIC 2 14 2MHz 1 V 18 V 0 °C +70 °C - 100mA -10mA -
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 -
RS Stock No. 190-4879
Mfr. Part No.DS1023S-200+
$22.078
Each (In a Tube of 46)
units
Surface Mount Programmable SOIC 1 16 10MHz 4.75 V 5.25 V 0 °C +70 °C - 8 (Minimum)mA -1mA -
RS Stock No. 923-1477
Mfr. Part No.CS82C54-10Z96
$12.42
Each (On a Reel of 750)
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. 197-7308
Mfr. Part No.LM555CN/NOPB
$1.654
Each (In a Pack of 10)
units
- - PDIP 1 8 - - - - - - - - -
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