Timer Circuits

Timer circuits are used to control one or more sequences of events within an electronic system. Timer circuits work by changing the circuit from its current state to another in advance following a set parameter.

Where would I use a timer circuit?

You can use timer circuits for a wide range of basic timing functions, like turning a light on for a certain amount of time or on and off repeatedly within a set time to create a flashing light or lighting sequence. Timer circuits 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. 866-0199
Mfr. Part No.NE555P
PHP15.662
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. 221-5535
Mfr. Part No.NE555P
PHP18.295
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. 162-8608
Mfr. Part No.LMC555IM/NOPB
PHP73.059
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. 824-6986
Mfr. Part No.LMC555IM/NOPB
PHP81.292
Each (In a Pack of 5)
units
Surface Mount Reset SOIC 1 8 3MHz 1.5 V 15 V -40 °C +125 °C - -10mA 50mA 100ns
RS Stock No. 165-4288
Mfr. Part No.MIC1557YM5-TR
BrandMicrochip
PHP38.588
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. 910-1705
Mfr. Part No.MIC1557YM5-TR
BrandMicrochip
PHP50.936
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. 121-8461
Mfr. Part No.NE555D
PHP16.002
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. 121-9248
Mfr. Part No.SE555P
PHP14.272
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
PHP29.272
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. 162-7010
Mfr. Part No.NE555PWR
PHP4.085
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. 662-3999
Mfr. Part No.NE555PWR
PHP18.008
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. 165-4290
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
PHP33.18
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. 922-2158
Mfr. Part No.LMC555CMM/NOPB
PHP52.994
Each (On a Reel of 1000)
units
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
RS Stock No. 910-1733
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
PHP42.704
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. 122-3283
Mfr. Part No.NE555S-13
PHP5.25
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. 662-4696
Mfr. Part No.TLC556IN
PHP86.436
Each (In a Pack of 5)
units
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 169-8718
Mfr. Part No.LM555CN
PHP13.183
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. 761-6104
Mfr. Part No.LMC555CMM/NOPB
PHP61.74
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. 823-4043
Mfr. Part No.NE555S-13
PHP14.669
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. 121-9209
Mfr. Part No.TLC556IN
PHP59.284
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -