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. 121-8461
Mfr. Part No.NE555D
$0.543
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. 866-0199
Mfr. Part No.NE555P
$0.609
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
$0.598
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. 806-2835
Mfr. Part No.LM555CN
$0.406
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. 169-8718
Mfr. Part No.LM555CN
$0.358
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. 921-5507
Mfr. Part No.ICM7555IBAZ
$0.946
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. 170-8188
Mfr. Part No.ICM7555IBAZ
BrandIntersil
$0.907
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. 121-9248
Mfr. Part No.SE555P
$0.649
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
$0.914
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. 346-7024
Mfr. Part No.TLC555IP
$4.36
Each
units
Through Hole Standard PDIP 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 121-8520
Mfr. Part No.TLC555IP
$0.937
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 920-3431
Mfr. Part No.SA555P
$0.576
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
$0.60
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. 518-9518
Mfr. Part No.MC14541BDG
$0.72
Each
units
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns@ 5 V
RS Stock No. 100-0685
Mfr. Part No.LM555CM/NOPB
$1.635
Each (In a Tube of 95)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS Stock No. 638-958
Mfr. Part No.TLC556CN
$2.52
Each
units
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 178-4795
Mfr. Part No.MC14541BDG
$0.534
Each (In a Tube of 55)
units
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns @ 5 V
RS Stock No. 460-516
Mfr. Part No.LM555CM/NOPB
$1.78
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
$1.91
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. 829-1516
Mfr. Part No.STWD100YNPWY3F
$1.33
Each (In a Pack of 10)
units
Surface Mount Watchdog SOT-23 1 5 - 2.7 V 5.5 V -40 °C +125 °C - - - -
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