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. 168-4873
Mfr. Part No.TLC555CD
R 8.456
Each (In a Tube of 75)
units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS stock no. 709-2110
Mfr. Part No.SE555P
R 5.682
Each (In a Pack of 5)
units
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS stock no. 920-3431
Mfr. Part No.SA555P
R 6.226
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
RS stock no. 121-9248
Mfr. Part No.SE555P
R 7.369
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS stock no. 156-5697
Mfr. Part No.LTC6993CS6-4#TRMPBF
R 35.861
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. 165-4290
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
R 10.094
Each (On a Reel of 3000)
units
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS stock no. 858-0891
Mfr. Part No.LTC6993CS6-4#TRMPBF
R 66.576
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. 809-6232
Mfr. Part No.CD4541BPW
R 2.40
Each (In a Pack of 15)
units
Surface Mount Programmable TSSOP 1 14 6MHz 3 V 18 V -55 °C +125 °C 100µA 12.6mA -12.6mA 18 μs@ 50 pF
RS stock no. 921-5377
Mfr. Part No.ICM7556IPDZ
R 30.24
Each (In a Pack of 5)
units
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS stock no. 100-0685
Mfr. Part No.LM555CM/NOPB
R 24.869
Each (In a Tube of 95)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS stock no. 460-516
Mfr. Part No.LM555CM/NOPB
R 17.586
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS stock no. 829-1516
Mfr. Part No.STWD100YNPWY3F
R 14.00
Each (In a Pack of 10)
units
Surface Mount Watchdog SOT-23 1 5 - 2.7 V 5.5 V -40 °C +125 °C - - - -
RS stock no. 146-2399
Mfr. Part No.ICM7556IPDZ
R 26.112
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS stock no. 145-0940
Mfr. Part No.CD4541BPW
R 5.83
Each (In a Tube of 90)
units
Surface Mount Programmable TSSOP 1 14 6MHz 3 V 18 V -55 °C +125 °C 100µA 12.6mA -12.6mA 18 μs @ 50 pF
RS stock no. 910-1733
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
R 13.581
Each (In a Pack of 10)
units
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS stock no. 517-1618
Mfr. Part No.SA555P
R 7.678
Each (In a Pack of 10)
units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
RS stock no. 923-6712
Mfr. Part No.CD4541BE
R 7.696
Each (In a Tube of 25)
units
Through Hole Programmable PDIP 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. 662-4668
Mfr. Part No.CD4541BM
R 5.243
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. 709-1999
Mfr. Part No.CD4541BE
R 7.612
Each (In a Pack of 10)
units
Through Hole Programmable PDIP 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. 145-1051
Mfr. Part No.CD4541BM
R 6.382
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