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. 528-416
Mfr. Part No.NE556N
SGD0.714
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS Stock No. 221-5535
Mfr. Part No.NE555P
SGD0.42
Each (In a Pack of 50)
units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 866-0199
Mfr. Part No.NE555P
SGD0.538
Each (In a Tube of 50)
units
Through Hole Adjustable and Monostable PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA 300 ns @ 15 pF
RS Stock No. 169-8718
Mfr. Part No.LM555CN
SGD0.324
Each (On a Reel of 3000)
units
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS Stock No. 806-2835
Mfr. Part No.LM555CN
SGD0.824
Each (In a Tube of 50)
units
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS Stock No. 121-9248
Mfr. Part No.SE555P
SGD0.57
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. 709-2110
Mfr. Part No.SE555P
SGD0.842
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. 121-8461
Mfr. Part No.NE555D
SGD0.328
Each (In a Tube of 75)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 145-1051
Mfr. Part No.CD4541BM
SGD0.603
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. 662-4668
Mfr. Part No.CD4541BM
SGD0.603
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. 121-8520
Mfr. Part No.TLC555IP
SGD0.937
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 858-0894
Mfr. Part No.LTC6994IS6-1#TRMPBF
SGD6.13
Each (In a Pack of 5)
units
Surface Mount Programmable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 24 ns@ 5 pF
RS Stock No. 761-6104
Mfr. Part No.LMC555CMM/NOPB
SGD1.956
Each (In a Pack of 5)
units
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
RS Stock No. 346-7024
Mfr. Part No.TLC555IP
SGD4.03
Each
units
Through Hole Standard PDIP 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 920-0177
Mfr. Part No.LTC6994IS6-1#TRMPBF
SGD3.773
Each (On a Reel of 500)
units
Surface Mount Programmable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 24 ns @ 5 pF
RS Stock No. 170-8188
Mfr. Part No.ICM7555IBAZ
BrandIntersil
SGD0.944
Each (In a Tube of 98)
units
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 921-5507
Mfr. Part No.ICM7555IBAZ
SGD0.944
Each (In a Pack of 25)
units
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 122-3283
Mfr. Part No.NE555S-13
SGD0.146
Each (On a Reel of 2500)
units
Surface Mount Programmable SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS Stock No. 823-4043
Mfr. Part No.NE555S-13
SGD0.417
Each (In a Pack of 50)
units
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS Stock No. 922-2158
Mfr. Part No.LMC555CMM/NOPB
SGD1.263
Each (On a Reel of 1000)
units
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
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