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. 662-4009
Mfr. Part No.TLC555QDR
TWD20.90
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. 121-8449
Mfr. Part No.TLC555CP
TWD21.00
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 638-942
Mfr. Part No.TLC555CP
TWD20.00
Each
units
Through Hole Standard PDIP 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 660-7761
Mfr. Part No.SE555D
TWD18.00
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. 145-0368
Mfr. Part No.SE555D
TWD4.50
Each (In a Tube of 75)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 806-2835
Mfr. Part No.LM555CN
TWD9.70
Each (In a Tube of 50)
units
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS Stock No. 169-8718
Mfr. Part No.LM555CN
TWD4.80
Each (On a Reel of 3000)
units
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS Stock No. 528-410
Mfr. Part No.TLC555IDR
TWD21.30
Each (In a Pack of 25)
units
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 620-0357
Mfr. Part No.TLC555ID
TWD22.70
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 121-8803
Mfr. Part No.LMC555CM/NOPB
TWD28.90
Each (In a Tube of 95)
units
Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns @ 5 V
RS Stock No. 534-3992
Mfr. Part No.LMC555CM/NOPB
TWD31.00
Each
units
Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS Stock No. 121-8948
Mfr. Part No.TLC555ID
TWD13.00
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. 910-1733
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
TWD17.90
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. 662-3999
Mfr. Part No.NE555PWR
TWD5.40
Each (In a Pack of 10)
units
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 162-7010
Mfr. Part No.NE555PWR
TWD3.40
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. 165-4290
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
TWD14.80
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. 121-9248
Mfr. Part No.SE555P
TWD9.30
Each (In a Tube of 50)
units
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 184-0871
Mfr. Part No.ICM7555CBAZ
BrandIntersil
TWD19.00
Each
units
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V 0 °C +70 °C - 20mA -0.8mA -
RS Stock No. 806-2832
Mfr. Part No.LM555CM
TWD9.30
Each (In a Tube of 90)
units
Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS Stock No. 178-4703
Mfr. Part No.LM555CM
TWD9.60
Each (In a Tube of 100)
units
Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -