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
New
RS Stock No. 196-8887
Mfr. Part No.ICM7555CBAZ-T
SGD0.412
Each (On a Reel of 2500)
units
- Standard SOIC - 8 1MHz - - - - - - - -
RS Stock No. 662-3993
Mfr. Part No.NE556DR
SGD0.567
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
New
RS Stock No. 190-4881
Mfr. Part No.DS1100LZ-20+
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. 162-7093
Mfr. Part No.TLC555QDR
SGD0.481
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 2MHz 5 V 15 V -40 °C +125 °C - 100mA -10mA -
RS Stock No. 662-4677
Mfr. Part No.TLC551CP
SGD2.272
Each (In a Pack of 5)
units
Through Hole Standard PDIP 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
New
RS Stock No. 197-7496
Mfr. Part No.SE555JG
SGD17.53
Each
units
- - CDIP - 8 - - - - - - - - -
New
RS Stock No. 197-7394
Mfr. Part No.NE556DR
SGD0.206
Each (On a Reel of 2500)
units
- - SOIC - 14 - - - - - - - - -
New
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. 885-5564
Mfr. Part No.SA555S-13
SGD0.554
Each (In a Pack of 50)
units
Surface Mount Precision, Reset SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
New
RS Stock No. 190-5917
Mfr. Part No.ICM7240IPE+
SGD12.585
Each (In a Pack of 2)
units
Through Hole - PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
RS Stock No. 638-958
Mfr. Part No.TLC556CN
SGD2.20
Each
units
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 732-7664
Mfr. Part No.ICM7555IPA+
SGD5.34
Each
units
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
New
RS Stock No. 197-7335
Mfr. Part No.LMC555CM/NOPB
SGD1.687
Each (In a Pack of 10)
units
- - SOIC - 8 - - - - - - - - -
RS Stock No. 162-7011
Mfr. Part No.NE556DR
SGD0.217
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS Stock No. 168-4872
Mfr. Part No.TLC556CD
SGD1.97
Each (In a Tube of 50)
units
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 485-8904
Mfr. Part No.HEF4541BT,512
BrandNexperia
SGD0.982
Each (In a Pack of 10)
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. 662-4003
Mfr. Part No.TLC556CDR
SGD1.91
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
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 -
New
RS Stock No. 191-4848
Mfr. Part No.ICM7556IPD+
SGD7.542
Each (In a Pack of 5)
units
Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 825-3564
Mfr. Part No.TLC552CD
SGD4.106
Each (In a Pack of 5)
units
Surface Mount Monolithic SOIC 2 14 2MHz 1 V 18 V 0 °C +70 °C - 100mA -10mA -
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