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. 145-0078
Mfr. Part No.TLC556CN
SGD1.89
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 162-8608
Mfr. Part No.LMC555IM/NOPB
SGD1.88
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. 166-2846
Mfr. Part No.FT3001MPX
SGD0.39
Each (On a Reel of 3000)
units
Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns
RS Stock No. 196-8891
Mfr. Part No.ICM7555IBAZ-T
SGD0.956
Each (In a Pack of 25)
units
- Standard SOIC 1 8 1MHz - - - - - - - -
RS Stock No. 662-4699
Mfr. Part No.TLC556MD
SGD2.698
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. 189-7188
Mfr. Part No.DS1682S+
SGD6.003
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. 190-5917
Mfr. Part No.ICM7240IPE+
SGD12.585
Each (In a Pack of 2)
units
Through Hole Fixed, Programmable PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
RS Stock No. 145-7365
Mfr. Part No.TLC556MD
SGD2.538
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. 197-7335
Mfr. Part No.LMC555CM/NOPB
SGD1.687
Each (In a Pack of 10)
units
- - SOIC 1 8 3MHz - - - - - - - -
RS Stock No. 145-0368
Mfr. Part No.SE555D
SGD0.473
Each (In a Tube of 75)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 189-8615
Mfr. Part No.DS1682S+
SGD8.365
Each (In a Pack of 2)
units
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
RS Stock No. 825-3564
Mfr. Part No.TLC552CD
SGD4.148
Each (In a Pack of 5)
units
Surface Mount Monolithic SOIC 2 14 2MHz 1 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 197-7394
Mfr. Part No.NE556DR
SGD0.206
Each (On a Reel of 2500)
units
- - SOIC 1 14 - - - - - - - - -
RS Stock No. 540-4520
Mfr. Part No.ICM7555ISA+
SGD3.61
Each
units
Surface Mount Standard SOIC 1 8 0.5MHz 2 V 18 V -20 °C +85 °C - 3.2mA -2mA -
RS Stock No. 920-3431
Mfr. Part No.SA555P
SGD0.462
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. 698-7127
Mfr. Part No.DS1682S+
SGD6.98
Each
units
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
RS Stock No. 740-5588
Mfr. Part No.NJM555V-TE1
SGD1.12
Each (In a Pack of 5)
units
Surface Mount Standard SSOP 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
RS Stock No. 922-4794
Mfr. Part No.TLC556CDR
SGD0.865
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. 156-5697
Mfr. Part No.LTC6993CS6-4#TRMPBF
SGD3.567
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. 809-6232
Mfr. Part No.CD4541BPW
SGD0.495
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
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