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. 145-0833
Mfr. Part No.NE556D
SGD0.666
Each (In a Tube of 50)
units
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
New
RS Stock No. 196-2112
Mfr. Part No.TS555IDTTR
SGD1.447
Each (In a Pack of 10)
units
Surface Mount Monostable SO 2 8 2.7MHz 2 V 16 V -40 °C +125 °C - 1mA -0.3mA -
New
RS Stock No. 197-7392
Mfr. Part No.NE555DR
SGD0.11
Each (On a Reel of 2500)
units
- - SOIC - 8 - - - - - - - - -
New
RS Stock No. 196-8889
Mfr. Part No.ICM7555IBAZ-T
SGD0.399
Each (On a Reel of 2500)
units
- Standard SOIC - 8 1MHz - - - - - - - -
RS Stock No. 162-8608
Mfr. Part No.LMC555IM/NOPB
SGD1.931
Each (In a Tube of 95)
units
Surface Mount Reset SOIC 1 8 3MHz 1.5 V 15 V -40 °C +125 °C - -10mA 50mA 100ns
RS Stock No. 145-0940
Mfr. Part No.CD4541BPW
SGD0.598
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. 146-2399
Mfr. Part No.ICM7556IPDZ
SGD2.038
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. 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. 517-1618
Mfr. Part No.SA555P
SGD0.57
Each (In a Pack of 10)
units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
RS Stock No. 121-8948
Mfr. Part No.TLC555ID
SGD1.039
Each (In a Tube of 75)
units
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 528-410
Mfr. Part No.TLC555IDR
SGD0.976
Each (In a Pack of 25)
units
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
New
RS Stock No. 197-7308
Mfr. Part No.LM555CN/NOPB
SGD1.434
Each (In a Pack of 10)
units
- - PDIP - 8 - - - - - - - - -
RS Stock No. 662-4687
Mfr. Part No.TLC556ID
SGD2.186
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
New
RS Stock No. 197-7393
Mfr. Part No.NE555DR
SGD0.372
Each (In a Pack of 50)
units
- - SOIC - 8 - - - - - - - - -
RS Stock No. 185-0950
Mfr. Part No.BD9555FVM-CGTR
BrandROHM
SGD0.885
Each (On a Reel of 3000)
units
Surface Mount - MSOP 1 8 - 4.5 V 42 V -40 °C +125 °C - 50mA -10mA -
RS Stock No. 165-8649
Mfr. Part No.SA555S-13
SGD0.19
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. 145-7365
Mfr. Part No.TLC556MD
SGD2.646
Each (In a Tube of 50)
units
Surface Mount Standard SOIC 2 14 2MHz 5 V 18 V -55 °C +125 °C - 100mA -10mA -
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
New
RS Stock No. 197-7307
Mfr. Part No.LM555CN/NOPB
SGD1.418
Each (In a Tube of 40)
units
- - PDIP - 8 - - - - - - - - -
New
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 -
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