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.

...
Read more Read less

Filters

Viewing 61 - 80 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. 824-6986
Mfr. Part No.LMC555IM/NOPB
SGD2.268
Each (In a Pack of 5)
units
Surface Mount Reset SOIC 1 8 3MHz 1.5 V 15 V -40 °C +125 °C - -10mA 50mA 100ns
RS Stock No. 910-1705
Mfr. Part No.MIC1557YM5-TR
BrandMicrochip
SGD1.234
Each (In a Pack of 10)
units
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
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. 196-8891
Mfr. Part No.ICM7555IBAZ-T
SGD0.956
Each (In a Pack of 25)
units
- Standard SOIC 1 8 1MHz - - - - - - - -
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. 858-0891
Mfr. Part No.LTC6993CS6-4#TRMPBF
SGD5.15
Each (In a Pack of 5)
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. 922-2690
Mfr. Part No.TLC555CDR
SGD0.45
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
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. 190-4884
Mfr. Part No.ICM7240IPE+
SGD10.853
Each (In a Tube of 25)
units
Through Hole Fixed, Programmable PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
RS Stock No. 190-4879
Mfr. Part No.DS1023S-200+
SGD22.176
Each (In a Tube of 46)
units
Surface Mount Programmable SOIC 1 16 10MHz 4.75 V 5.25 V 0 °C +70 °C - 8 (Minimum)mA -1mA -
RS Stock No. 190-5914
Mfr. Part No.DS1100LZ-50+
SGD8.36
Each (In a Pack of 2)
units
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS Stock No. 190-5904
Mfr. Part No.DS1023S-200+
SGD26.04
Each
units
Surface Mount Programmable SOIC 1 16 10MHz 4.75 V 5.25 V 0 °C +70 °C - 8 (Minimum)mA -1mA -
RS Stock No. 162-7010
Mfr. Part No.NE555PWR
SGD0.12
Each (On a Reel of 2000)
units
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
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. 732-1313
Mfr. Part No.SE556J
SGD26.81
Each
units
Through Hole Standard CDIP 2 14 - 4.5 V 18 V -55 °C +125 °C 24mA 200mA -200mA -
RS Stock No. 165-4288
Mfr. Part No.MIC1557YM5-TR
BrandMicrochip
SGD0.88
Each (On a Reel of 3000)
units
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS Stock No. 190-5920
Mfr. Part No.MAX7375AXR805+T
SGD2.24
Each (In a Pack of 5)
units
Surface Mount - SC-70 - 3 9.99MHz 2.7 V 5.5 V -40 °C +125 °C - - - -
RS Stock No. 145-0940
Mfr. Part No.CD4541BPW
SGD0.55
Each (In a Tube of 90)
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
RS Stock No. 188-9229
Mfr. Part No.TS556IDTTR
SGD0.77
Each (On a Reel of 2500)
units
Surface Mount - SO 2 14 2.7MHz 2 V 16 V -40 °C +125 °C - 8mA -2mA 100 ns @ 10 pF
RS Stock No. 829-1516
Mfr. Part No.STWD100YNPWY3F
SGD1.29
Each (In a Pack of 10)
units
Surface Mount Watchdog SOT-23 1 5 - 2.7 V 5.5 V -40 °C +125 °C - - - -