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 866-0199
Référence fabricantNE555P
0,267 €
Each (In a Tube of 50)
Unité
Through Hole Adjustable and Monostable PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA 300 ns @ 15 pF
N° de stock RS 221-5535
Référence fabricantNE555P
0,315 €
Each (In a Pack of 50)
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Through Hole Standard PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
N° de stock RS 806-2835
Référence fabricantLM555CN
0,474 €
Each (In a Tube of 50)
Unité
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
N° de stock RS 169-8718
Référence fabricantLM555CN
0,194 €
Each (On a Reel of 3000)
Unité
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
N° de stock RS 121-9248
Référence fabricantSE555P
0,363 €
Each (In a Tube of 50)
Unité
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
N° de stock RS 709-2110
Référence fabricantSE555P
0,532 €
Each (In a Pack of 5)
Unité
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
N° de stock RS 112-5368
Référence fabricantNE556D
0,46 €
Each
Unité
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
N° de stock RS 638-958
Référence fabricantTLC556CN
1,22 €
Each
Unité
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
N° de stock RS 145-0833
Référence fabricantNE556D
0,355 €
Each (In a Tube of 50)
Unité
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
N° de stock RS 121-8461
Référence fabricantNE555D
0,261 €
Each (In a Tube of 75)
Unité
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
N° de stock RS 178-5489
Référence fabricantTLC555MJG
5,705 €
Each (In a Tube of 10)
Unité
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
N° de stock RS 796-8316
Référence fabricantTLC555MJG
6,97 €
Each (In a Pack of 2)
Unité
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
N° de stock RS 785-818
Référence fabricantNE555D
0,36 €
Each
Unité
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
N° de stock RS 145-0078
Référence fabricantTLC556CN
1,017 €
Each (In a Tube of 25)
Unité
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
N° de stock RS 460-516
Référence fabricantLM555CM/NOPB
0,921 €
Each (In a Pack of 10)
Unité
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
N° de stock RS 100-0685
Référence fabricantLM555CM/NOPB
1,245 €
Each (In a Tube of 95)
Unité
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
N° de stock RS 528-416
Référence fabricantNE556N
0,386 €
Each (In a Tube of 25)
Unité
Through Hole Standard PDIP 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
N° de stock RS 528-410
Référence fabricantTLC555IDR
0,573 €
Each (In a Pack of 25)
Unité
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
N° de stock RS 145-0415
Référence fabricantTLC551CP
1,586 €
Each (In a Tube of 50)
Unité
Through Hole Standard PDIP 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
N° de stock RS 920-3431
Référence fabricantSA555P
0,304 €
Each (In a Tube of 50)
Unité
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -