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. 124-4531
Mfr. Part No.LM555CN/NOPB
$1.992
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. 866-0192
Mfr. Part No.LM555CN/NOPB
$1.47
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. 346-7024
Mfr. Part No.TLC555IP
$1.39
Each
units
Through Hole Standard PDIP 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 638-942
Mfr. Part No.TLC555CP
$2.00
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
$0.82
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. 920-3431
Mfr. Part No.SA555P
$0.424
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. 517-1618
Mfr. Part No.SA555P
$0.59
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. 638-958
Mfr. Part No.TLC556CN
$2.23
Each
units
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 460-516
Mfr. Part No.LM555CM/NOPB
$1.65
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. 145-0078
Mfr. Part No.TLC556CN
$1.218
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. 534-3992
Mfr. Part No.LMC555CM/NOPB
$1.95
Each
units
Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS Stock No. 121-8804
Mfr. Part No.LMC555CN/NOPB
$1.74
Each (In a Tube of 40)
units
Through Hole Standard PDIP 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns @ 5 V
RS Stock No. 534-4002
Mfr. Part No.LMC555CN/NOPB
$2.20
Each
units
Through Hole Standard PDIP 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS Stock No. 528-416
Mfr. Part No.NE556N
$0.40
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. 662-4696
Mfr. Part No.TLC556IN
$2.43
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. 121-9209
Mfr. Part No.TLC556IN
$1.668
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 796-8316
Mfr. Part No.TLC555MJG
$7.74
Each (In a Pack of 2)
units
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
RS Stock No. 168-4873
Mfr. Part No.TLC555CD
$0.725
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. 178-5489
Mfr. Part No.TLC555MJG
$17.39
Each (In a Tube of 10)
units
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
RS Stock No. 662-3993
Mfr. Part No.NE556DR
$0.573
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -