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.

...
Read more Read less

Filters

Viewing 1 - 20 of 157 products
Results per page
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. 528-416
Mfr. Part No.NE556N
SGD0.714
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. 534-4002
Mfr. Part No.LMC555CN/NOPB
SGD1.98
Each
units
Through Hole Standard PDIP 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS Stock No. 806-2835
Mfr. Part No.LM555CN
SGD0.792
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. 121-8804
Mfr. Part No.LMC555CN/NOPB
SGD1.686
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. 169-8718
Mfr. Part No.LM555CN
SGD0.318
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. 124-4531
Mfr. Part No.LM555CN/NOPB
SGD1.421
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. 145-1051
Mfr. Part No.CD4541BM
SGD0.598
Each (In a Tube of 50)
units
Surface Mount Programmable SOIC 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns @ 5 V
RS Stock No. 662-4668
Mfr. Part No.CD4541BM
SGD0.598
Each (In a Pack of 10)
units
Surface Mount Programmable SOIC 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns@ 5 V
RS Stock No. 823-4043
Mfr. Part No.NE555S-13
SGD0.409
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. 122-3283
Mfr. Part No.NE555S-13
SGD0.143
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. 346-7024
Mfr. Part No.TLC555IP
SGD1.34
Each
units
Through Hole Standard PDIP 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 858-0894
Mfr. Part No.LTC6994IS6-1#TRMPBF
SGD5.91
Each (In a Pack of 5)
units
Surface Mount Programmable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 24 ns@ 5 pF
RS Stock No. 920-0177
Mfr. Part No.LTC6994IS6-1#TRMPBF
SGD3.773
Each (On a Reel of 500)
units
Surface Mount Programmable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 24 ns @ 5 pF
RS Stock No. 698-7127
Mfr. Part No.DS1682S+
SGD8.29
Each
units
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
RS Stock No. 923-5573
Mfr. Part No.DS1682S+
SGD5.88
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. 170-8188
Mfr. Part No.ICM7555IBAZ
BrandIntersil
SGD0.897
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. 921-5507
Mfr. Part No.ICM7555IBAZ
SGD0.897
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. 103-9932
Mfr. Part No.ICM7555IPA+
SGD5.604
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 170-8196
Mfr. Part No.CS82C54-10Z
BrandIntersil
SGD15.305
Each (In a Tube of 37)
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS Stock No. 796-8316
Mfr. Part No.TLC555MJG
SGD7.765
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 -
Related Products
A range of highly stable precision timing circuits ...
Description:
A range of highly stable precision timing circuits for the generation of accurate time delays or timing pulses. These timers can be operated in monostable (one-shot) or astable (oscillator) mode with timing periods ranging from less than a microsecond to ...
ON Semiconductor offers the industry standard 555 timer, ...
Description:
ON Semiconductor offers the industry standard 555 timer, a highly stable controller capable of producing accurate timing pulses. With monostable operation, you control the time delay by one external resistor and one capacitor. With a stable operation, the frequency and ...
A range of highly stable precision timing circuits ...
Description:
A range of highly stable precision timing circuits for the generation of accurate time delays or timing pulses. These timers can be operated in monostable (one-shot) or astable (oscillator) mode with timing periods ranging from less than a microsecond to ...
A range of highly stable precision timing circuits ...
Description:
A range of highly stable precision timing circuits for the generation of accurate time delays or timing pulses. These timers can be operated in monostable (one-shot) or astable (oscillator) mode with timing periods ranging from less than a microsecond to ...