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.

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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. 660-7761
Mfr. Part No.SE555D
SGD0.58
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 146-2399
Mfr. Part No.ICM7556IPDZ
SGD1.95
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 168-4873
Mfr. Part No.TLC555CD
SGD0.917
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. 178-7003
Mfr. Part No.HEF4541BT,512
BrandNexperia
SGD0.787
Each (In a Tube of 57)
units
Surface Mount Programmable SOIC 1 14 36MHz 3 V 15 V -40 °C +85 °C - 4.2mA -4.2mA 1150 ns @ 5 V
RS Stock No. 662-4009
Mfr. Part No.TLC555QDR
SGD1.03
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 1 8 2MHz 5 V 15 V -40 °C +125 °C - 100mA -10mA -
RS Stock No. 190-5911
Mfr. Part No.DS1100LZ-200+
SGD11.155
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. 921-5541
Mfr. Part No.IS82C54Z
SGD30.43
Each
units
Surface Mount Programmable PLCC 1 28 8MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 150 ns @ 5 V
RS Stock No. 190-4886
Mfr. Part No.ICM7555ESA+
SGD2.87
Each (In a Tube of 100)
units
Surface Mount Astable, RC Monostable SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
RS Stock No. 923-1470
Mfr. Part No.IS82C54-10Z
SGD35.391
Each (In a Tube of 37)
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS Stock No. 165-8649
Mfr. Part No.SA555S-13
SGD0.194
Each (On a Reel of 2500)
units
Surface Mount Precision, Reset SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
RS Stock No. 196-8887
Mfr. Part No.ICM7555CBAZ-T
SGD0.412
Each (On a Reel of 2500)
units
- Standard SOIC 1 8 1MHz - - - - - - - -
RS Stock No. 196-2111
Mfr. Part No.TS555IDTTR
SGD0.705
Each (On a Reel of 2500)
units
Surface Mount Monostable SO 2 8 2.7MHz 2 V 16 V -40 °C +125 °C - 1mA -0.3mA -
RS Stock No. 189-8665
Mfr. Part No.ICM7555IPA+
SGD4.48
Each (In a Pack of 5)
units
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 197-7307
Mfr. Part No.LM555CN/NOPB
SGD1.244
Each (In a Tube of 40)
units
- - PDIP 1 8 - - - - - - - - -
RS Stock No. 923-1405
Mfr. Part No.IS82C54Z
SGD27.437
Each (In a Tube of 37)
units
Surface Mount Programmable PLCC 1 28 8MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 150 ns @ 5 V
RS Stock No. 197-7574
Mfr. Part No.TLC555CP
SGD0.877
Each (In a Pack of 25)
units
Surface Mount - PDIP 1 8 2MHz - - - - - - - -
RS Stock No. 197-7308
Mfr. Part No.LM555CN/NOPB
SGD1.217
Each (In a Pack of 10)
units
- - PDIP 1 8 - - - - - - - - -
RS Stock No. 190-4883
Mfr. Part No.DS1100LZ-50+
SGD7.615
Each (In a Tube of 100)
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. 788-334
Mfr. Part No.TLC555CD
SGD1.34
Each
units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
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