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. 162-6643
Mfr. Part No.NA555DR
SGD0.146
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C 15mA 200mA -200mA 300 ns @ 15 pF
RS Stock No. 921-5541
Mfr. Part No.IS82C54Z
SGD28.55
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. 923-1571
Mfr. Part No.ICM7242IPAZ
SGD7.046
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
New
RS Stock No. 191-4848
Mfr. Part No.ICM7556IPD+
SGD5.75
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 -
New
RS Stock No. 197-7335
Mfr. Part No.LMC555CM/NOPB
SGD1.633
Each (In a Pack of 10)
units
- - SOIC - 8 - - - - - - - - -
RS Stock No. 660-7761
Mfr. Part No.SE555D
SGD0.768
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. 920-3431
Mfr. Part No.SA555P
SGD0.57
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
New
RS Stock No. 197-7393
Mfr. Part No.NE555DR
SGD0.372
Each (In a Pack of 50)
units
- - SOIC - 8 - - - - - - - - -
RS Stock No. 922-2690
Mfr. Part No.TLC555CDR
SGD0.417
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. 166-2846
Mfr. Part No.FT3001MPX
SGD0.39
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. 885-5564
Mfr. Part No.SA555S-13
SGD0.532
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. 197-7395
Mfr. Part No.NE556DR
SGD0.559
Each (In a Pack of 25)
units
- - SOIC - 14 - - - - - - - - -
RS Stock No. 121-9741
Mfr. Part No.TPL5000DGST
SGD1.803
Each (On a Reel of 250)
units
Surface Mount Programmable VSSOP 1 10 - 1.8 V 5 V -40 °C +105 °C - - - -
New
RS Stock No. 190-4881
Mfr. Part No.DS1100LZ-20+
SGD7.23
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. 921-5951
Mfr. Part No.ICM7242IPAZ
SGD8.28
Each (In a Pack of 2)
units
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS Stock No. 740-5588
Mfr. Part No.NJM555V-TE1
SGD1.62
Each (In a Pack of 5)
units
Surface Mount Standard SSOP 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
New
RS Stock No. 196-8891
Mfr. Part No.ICM7555IBAZ-T
SGD0.926
Each (In a Pack of 25)
units
- Standard SOIC - 8 1MHz - - - - - - - -
New
RS Stock No. 190-5914
Mfr. Part No.DS1100LZ-50+
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. 121-9209
Mfr. Part No.TLC556IN
SGD2.009
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
New
RS Stock No. 190-4885
Mfr. Part No.ICM7242IPA+
SGD5.23
Each (In a Tube of 50)
units
Through Hole - PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
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