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 Prix 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
N° de stock RS 662-4674
Référence fabricantTLC551CD
1,79 €
Each (In a Pack of 5)
Unité
Surface Mount Standard SOIC 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
N° de stock RS 190-5926
Référence fabricantICM7242IPA+
4,032 €
Each (In a Pack of 5)
Unité
Through Hole Fixed, Programmable PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
N° de stock RS 772-9310
Référence fabricantFT3001MPX
0,187 €
Each (In a Pack of 10)
Unité
Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns
N° de stock RS 189-7189
Référence fabricantICM7555IPA+
2,394 €
Each (In a Tube of 50)
Unité
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
N° de stock RS 662-4012
Référence fabricantTLC556IDR
1,186 €
Each (In a Pack of 5)
Unité
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
N° de stock RS 162-7093
Référence fabricantTLC555QDR
0,287 €
Each (On a Reel of 2500)
Unité
Surface Mount Standard SOIC 1 8 2MHz 5 V 15 V -40 °C +125 °C - 100mA -10mA -
N° de stock RS 662-4668
Référence fabricantCD4541BM
0,325 €
Each (In a Pack of 10)
Unité
Surface Mount Programmable SOIC 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns@ 5 V
N° de stock RS 178-4795
Référence fabricantMC14541BDG
0,279 €
Each (In a Tube of 55)
Unité
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns @ 5 V
N° de stock RS 518-9518
Référence fabricantMC14541BDG
0,39 €
Each
Unité
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns@ 5 V
N° de stock RS 145-1217
Référence fabricantTLC551CD
1,517 €
Each (In a Tube of 75)
Unité
Surface Mount Standard SOIC 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
N° de stock RS 196-8888
Référence fabricantICM7555CBAZ-T
0,51 €
Each (In a Pack of 25)
Unité
- Standard SOIC 1 8 1MHz - - - - - - - -
N° de stock RS 145-0016
Référence fabricantCD4536BEE4
0,193 €
Each (In a Tube of 25)
Unité
Through Hole Programmable PDIP 1 16 - 3 V 18 V -55 °C +125 °C 0.1mA 4.2mA -4.2mA 8000 ns @ 5 V
N° de stock RS 190-5939
Référence fabricantICM7555ESA+
1,903 €
Each (In a Pack of 10)
Unité
Surface Mount Astable, RC Monostable SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
N° de stock RS 787-8706
Référence fabricantMC1455DR2G
0,301 €
Each (In a Pack of 20)
Unité
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
N° de stock RS 121-9209
Référence fabricantTLC556IN
1,13 €
Each (In a Tube of 25)
Unité
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
N° de stock RS 190-4882
Référence fabricantDS1100LZ-200+
3,928 €
Each (In a Tube of 100)
Unité
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
N° de stock RS 885-5564
Référence fabricantSA555S-13
MarqueDiodesZetex
0,289 €
Each (In a Pack of 50)
Unité
Surface Mount Precision, Reset SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
N° de stock RS 825-5340
Référence fabricantTPL5000DGST
0,682 €
Each (In a Pack of 5)
Unité
Surface Mount Programmable VSSOP 1 10 - 1.8 V 5 V -40 °C +105 °C - - - -
N° de stock RS 709-1999
Référence fabricantCD4541BE
0,362 €
Each (In a Pack of 10)
Unité
Through Hole Programmable PDIP 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns@ 5 V
N° de stock RS 191-4848
Référence fabricantICM7556IPD+
4,44 €
Each (In a Pack of 5)
Unité
Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -