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 1 - 20 of 157 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. 121-8449
Mfr. Part No.TLC555CP
PHP28.665
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
PHP40.80
Each
units
Through Hole Standard PDIP 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 162-8608
Mfr. Part No.LMC555IM/NOPB
PHP51.242
Each (In a Tube of 95)
units
Surface Mount Reset SOIC 1 8 3MHz 1.5 V 15 V -40 °C +125 °C - -10mA 50mA 100ns
RS Stock No. 824-6986
Mfr. Part No.LMC555IM/NOPB
PHP75.288
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. 165-4288
Mfr. Part No.MIC1557YM5-TR
BrandMicrochip
PHP28.623
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. 910-1705
Mfr. Part No.MIC1557YM5-TR
BrandMicrochip
PHP41.42
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. 121-8804
Mfr. Part No.LMC555CN/NOPB
PHP45.045
Each (In a Tube of 40)
units
Through Hole Standard PDIP 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns @ 5 V
RS Stock No. 534-4002
Mfr. Part No.LMC555CN/NOPB
PHP62.75
Each
units
Through Hole Standard PDIP 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS Stock No. 124-4531
Mfr. Part No.LM555CN/NOPB
PHP49.302
Each (In a Pack of 10)
units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 200 (Sink)mA 200 (Source)mA -
RS Stock No. 866-0192
Mfr. Part No.LM555CN/NOPB
PHP30.501
Each (In a Tube of 40)
units
Through Hole Adjustable and Monostable PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - - - 100ns
RS Stock No. 121-9248
Mfr. Part No.SE555P
PHP15.671
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. 162-7010
Mfr. Part No.NE555PWR
PHP5.187
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. 662-3999
Mfr. Part No.NE555PWR
PHP10.412
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. 910-1733
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
PHP35.72
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. 169-8718
Mfr. Part No.LM555CN
PHP8.24
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. 662-4696
Mfr. Part No.TLC556IN
PHP77.72
Each (In a Pack of 5)
units
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 121-9209
Mfr. Part No.TLC556IN
PHP38.64
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 806-2832
Mfr. Part No.LM555CM
PHP13.80
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. 806-2835
Mfr. Part No.LM555CN
PHP14.355
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. 178-4703
Mfr. Part No.LM555CM
PHP14.39
Each (In a Tube of 100)
units
Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
Related Products
Selectable Time Intervals 100 ms to 7200 secondsTimer ...
Description:
Selectable Time Intervals 100 ms to 7200 secondsTimer Accuracy 1% typicalCurrent Consumption 35 nA typical at 2.5 VResistor Selectable Time IntervalManual Power-On InputOne-Shot FeatureSupply Voltage Range 1.8 V to 5.5 V.
A range of highly stable precision timing circuits ...
Description:
A range of highly stable precision timing circuits for the generation of accurate time delays or timing pulses. These timers can be operated in monostable (one-shot) or astable (oscillator) mode with timing periods ranging from less than a microsecond to ...
A range of highly stable precision timing circuits ...
Description:
A range of highly stable precision timing circuits for the generation of accurate time delays or timing pulses. These timers can be operated in monostable (one-shot) or astable (oscillator) mode with timing periods ranging from less than a microsecond to ...
Maxim Integrated offers the 555 timer, a highly ...
Description:
Maxim Integrated offers the 555 timer, a highly stable controller capable of producing accurate timing pulses. With monostable operation, you control the time delay by one external resistor and one capacitor. With a stable operation, the frequency and duty cycle ...