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.

...
Read more Read less

Filters

Viewing 41 - 60 of 144 products
Results per page
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. 787-8709
Mfr. Part No.MC1455BDR2G
HK$3.073
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS Stock No. 166-2846
Mfr. Part No.FT3001MPX
HK$2.215
Each (On a Reel of 3000)
units
Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns
RS Stock No. 185-1005
Mfr. Part No.BD9555FVM-CGTR
BrandROHM
HK$7.306
Each (In a Pack of 10)
units
Surface Mount - MSOP 1 8 - 4.5 V 42 V -40 °C +125 °C - 50mA -10mA -
RS Stock No. 662-3993
Mfr. Part No.NE556DR
HK$3.146
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
New
RS Stock No. 189-8665
Mfr. Part No.ICM7555IPA+
HK$18.636
Each (In a Pack of 5)
units
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 824-6986
Mfr. Part No.LMC555IM/NOPB
HK$12.994
Each (In a Pack of 5)
units
Surface Mount Reset SOIC 1 8 3MHz 1.5 V 15 V -40 °C +125 °C - -10mA 50mA 100ns
RS Stock No. 145-0833
Mfr. Part No.NE556D
HK$3.783
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. 190-5939
Mfr. Part No.ICM7555ESA+
HK$14.544
Each (In a Pack of 10)
units
Surface Mount - SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
RS Stock No. 923-1470
Mfr. Part No.IS82C54-10Z
HK$178.177
Each (In a Tube of 37)
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 100 ns @ 5 V
New
RS Stock No. 190-5914
Mfr. Part No.DS1100LZ-50+
HK$59.565
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 -
RS Stock No. 517-1618
Mfr. Part No.SA555P
HK$2.928
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. 922-2690
Mfr. Part No.TLC555CDR
HK$2.278
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 162-6643
Mfr. Part No.NA555DR
HK$0.83
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C 15mA 200mA -200mA 300 ns @ 15 pF
RS Stock No. 638-942
Mfr. Part No.TLC555CP
HK$15.05
Each
units
Through Hole Standard PDIP 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 823-4043
Mfr. Part No.NE555S-13
HK$2.418
Each (In a Pack of 50)
units
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS Stock No. 162-9390
Mfr. Part No.MC1455DR2G
HK$1.29
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS Stock No. 732-1317
Mfr. Part No.SE555JG
HK$68.58
Each
units
Through Hole Standard CDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 121-9209
Mfr. Part No.TLC556IN
HK$11.407
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
New
RS Stock No. 190-5908
Mfr. Part No.DS1100LZ-20+
HK$59.565
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 -
RS Stock No. 825-3564
Mfr. Part No.TLC552CD
HK$21.31
Each (In a Pack of 5)
units
Surface Mount Monolithic SOIC 2 14 2MHz 1 V 18 V 0 °C +70 °C - 100mA -10mA -
Related Products
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam ...
Description:
Lower handle effort reduces operator fatigueFully serviceableHigh-strength beam and pump linkage for long lifePumping handle included on all modelsSafety relief valve to prevent overloadAutomatic by-pass port to prevent over-extensionWiper seal for extended lifeThick base material with large area for increased ...