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 923-6712
Référence fabricantCD4541BE
0,362 €
Each (In a Tube of 25)
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 197-7574
Référence fabricantTLC555CP
0,576 €
Each (In a Pack of 25)
Unité
Surface Mount - PDIP 1 8 2MHz - - - - - - - -
N° de stock RS 190-5911
Référence fabricantDS1100LZ-200+
5,25 €
Each (In a Pack of 2)
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 185-1005
Référence fabricantBD9555FVM-CGTR
MarqueROHM
1,047 €
Each (In a Pack of 10)
Unité
Surface Mount Control MSOP 1 8 - 4.5 V 42 V -40 °C +125 °C - 50mA -10mA -
N° de stock RS 662-4699
Référence fabricantTLC556MD
1,772 €
Each (In a Pack of 5)
Unité
Surface Mount Standard SOIC 2 14 2MHz 5 V 18 V -55 °C +125 °C - 100mA -10mA -
N° de stock RS 787-8709
Référence fabricantMC1455BDR2G
0,36 €
Each (In a Pack of 10)
Unité
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
N° de stock RS 165-8349
Référence fabricantNA555S-13
MarqueDiodesZetex
0,112 €
Each (On a Reel of 2500)
Unité
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C - 200mA -200mA -
N° de stock RS 662-4687
Référence fabricantTLC556ID
1,222 €
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 189-8615
Référence fabricantDS1682S+
4,48 €
Each (In a Pack of 2)
Unité
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
N° de stock RS 662-3999
Référence fabricantNE555PWR
0,23 €
Each (In a Pack of 10)
Unité
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
N° de stock RS 660-7761
Référence fabricantSE555D
0,43 €
Each (In a Pack of 5)
Unité
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
N° de stock RS 197-7395
Référence fabricantNE556DR
0,313 €
Each (In a Pack of 25)
Unité
- - SOIC 1 14 - - - - - - - - -
N° de stock RS 190-4883
Référence fabricantDS1100LZ-50+
3,918 €
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 178-7003
Référence fabricantHEF4541BT,512
MarqueNexperia
0,43 €
Each (In a Tube of 57)
Unité
Surface Mount Programmable SOIC 1 14 36MHz 3 V 15 V -40 °C +85 °C - 4.2mA -4.2mA 1150 ns @ 5 V
N° de stock RS 145-0940
Référence fabricantCD4541BPW
0,119 €
Each (In a Tube of 90)
Unité
Surface Mount Programmable TSSOP 1 14 6MHz 3 V 18 V -55 °C +125 °C 100µA 12.6mA -12.6mA 18 μs @ 50 pF
N° de stock RS 190-4879
Référence fabricantDS1023S-200+
10,465 €
Each (In a Tube of 46)
Unité
Surface Mount Programmable SOIC 1 16 10MHz 4.75 V 5.25 V 0 °C +70 °C - 8 (Minimum)mA -1mA -
N° de stock RS 145-1051
Référence fabricantCD4541BM
0,325 €
Each (In a Tube of 50)
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 190-5952
Référence fabricantICM7556ISD+
3,468 €
Each (In a Pack of 5)
Unité
Surface Mount Astable, RC Monostable SOIC 1 14 - 2 V 18 V -20 °C +85 °C - - - -
N° de stock RS 858-0891
Référence fabricantLTC6993CS6-4#TRMPBF
3,012 €
Each (In a Pack of 5)
Unité
Surface Mount Monostable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 28 ns@ 5 pF
N° de stock RS 761-6104
Référence fabricantLMC555CMM/NOPB
1,08 €
Each (In a Pack of 5)
Unité
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -