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. 866-0192
Mfr. Part No.LM555CN/NOPB
R 14.166
Each (In a Tube of 40)
units
Through Hole Adjustable and Monostable PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - - - 100ns
RS stock no. 124-4531
Mfr. Part No.LM555CN/NOPB
R 19.18
Each (In a Pack of 10)
units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 200 (Sink)mA 200 (Source)mA -
RS stock no. 184-0871
Mfr. Part No.ICM7555CBAZ
BrandIntersil
R 10.61
Each
units
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V 0 °C +70 °C - 20mA -0.8mA -
RS stock no. 638-942
Mfr. Part No.TLC555CP
R 38.66
Each
units
Through Hole Standard PDIP 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS stock no. 121-8449
Mfr. Part No.TLC555CP
R 10.808
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS stock no. 170-8173
Mfr. Part No.ICM7555IPAZ
R 10.652
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS stock no. 921-5374
Mfr. Part No.ICM7555IPAZ
R 11.559
Each (In a Pack of 10)
units
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS stock no. 785-818
Mfr. Part No.NE555D
R 4.31
Each
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS stock no. 169-8718
Mfr. Part No.LM555CN
R 2.053
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
R 5.067
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. 921-5507
Mfr. Part No.ICM7555IBAZ
R 9.819
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. 662-3999
Mfr. Part No.NE555PWR
R 2.983
Each (In a Pack of 10)
units
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS stock no. 162-7010
Mfr. Part No.NE555PWR
R 1.53
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. 170-8188
Mfr. Part No.ICM7555IBAZ
BrandIntersil
R 8.915
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. 121-8948
Mfr. Part No.TLC555ID
R 10.497
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. 620-0357
Mfr. Part No.TLC555ID
R 8.714
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS stock no. 698-7127
Mfr. Part No.DS1682S+
R 85.40
Each
units
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
RS stock no. 534-3992
Mfr. Part No.LMC555CM/NOPB
R 38.74
Each
units
Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS stock no. 923-5573
Mfr. Part No.DS1682S+
R 53.874
Each (In a Tube of 100)
units
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
RS stock no. 528-410
Mfr. Part No.TLC555IDR
R 9.781
Each (In a Pack of 25)
units
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -