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. 806-2835
Mfr. Part No.LM555CN
$0.555
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
$0.232
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. 518-9518
Mfr. Part No.MC14541BDG
$0.62
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. 178-4795
Mfr. Part No.MC14541BDG
$0.563
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. 688-1543
Mfr. Part No.MC14541BDR2G
$0.272
Each (In a Pack of 5)
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. 772-9313
Mfr. Part No.FT7522L6X
$0.32
Each (In a Pack of 25)
units
Surface Mount Reset MicroPak 1 6 - 1.8 V 5 V -40 °C +85 °C 1µA 50mA -50µA 9ns
RS Stock No. 862-9218
Mfr. Part No.FT8010UMX
$0.914
Each (In a Pack of 10)
units
Surface Mount Reset UMLP 1 10 - 1.8 V 5 V -40 °C +85 °C 20µA 50mA -50mA 310ns
RS Stock No. 787-8702
Mfr. Part No.MC1455DG
$0.55
Each (In a Pack of 14)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS Stock No. 787-8706
Mfr. Part No.MC1455DR2G
$0.439
Each (In a Pack of 20)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS Stock No. 145-4759
Mfr. Part No.MC1455BDR2G
$0.313
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS Stock No. 787-8709
Mfr. Part No.MC1455BDR2G
$0.678
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS Stock No. 166-3192
Mfr. Part No.FT7522L6X
$0.391
Each (On a Reel of 5000)
units
Surface Mount Reset MicroPak 1 6 - 1.8 V 5 V -40 °C +85 °C 1µA 50mA -50µA 9ns
RS Stock No. 806-2832
Mfr. Part No.LM555CM
$0.468
Each (In a Tube of 90)
units
Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS Stock No. 772-9310
Mfr. Part No.FT3001MPX
$0.492
Each (In a Pack of 10)
units
Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns
RS Stock No. 162-9390
Mfr. Part No.MC1455DR2G
$0.309
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS Stock No. 166-2846
Mfr. Part No.FT3001MPX
$0.63
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. 178-4703
Mfr. Part No.LM555CM
$0.347
Each (In a Tube of 100)
units
Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS Stock No. 166-3544
Mfr. Part No.FT8010UMX
$0.646
Each (On a Reel of 5000)
units
Surface Mount Reset UMLP 1 10 - 1.8 V 5 V -40 °C +85 °C 20µA 50mA -50mA 310ns