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 circuitsYou 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 timersThe 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 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. 921-5951
Mfr. Part No.ICM7242IPAZ
£4.55
Each (In a Pack of 2)
Units
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS Stock No. 165-4288
Mfr. Part No.MIC1557YM5-TR
BrandMicrochip
£0.457
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. 485-8904
Mfr. Part No.HEF4541BT,512
BrandNexperia
£0.388
Each (In a Pack of 10)
Units
Surface Mount Programmable SOIC 1 14 36MHz 3 V 15 V -40 °C +85 °C - 4.2mA -4.2mA 1150 ns@ 5 V
RS Stock No. 145-0368
Mfr. Part No.SE555D
£0.286
Each (In a Tube of 75)
Units
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 660-7761
Mfr. Part No.SE555D
£0.388
Each (In a Pack of 5)
Units
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 517-1618
Mfr. Part No.SA555P
£0.28
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. 920-3431
Mfr. Part No.SA555P
£0.28
Each (In a Tube of 50)
Units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
RS Stock No. 170-8188
Mfr. Part No.ICM7555IBAZ
BrandIntersil
£0.461
Each (In a Tube of 98)
Units
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 921-5507
Mfr. Part No.ICM7555IBAZ
£0.529
Each (In a Pack of 25)
Units
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 638-958
Mfr. Part No.TLC556CN
£1.12
Each
Units
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 145-0078
Mfr. Part No.TLC556CN
£0.952
Each (In a Tube of 25)
Units
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 518-9518A
Mfr. Part No.MC14541BDG
£0.291
Each (In a Pack of 55)
Units
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
RS Stock No. 178-4795
Mfr. Part No.MC14541BDG
£0.252
Each (In a Tube of 55)
Units
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
RS Stock No. 518-9518
Mfr. Part No.MC14541BDG
£0.31
Each
Units
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
RS Stock No. 460-516
Mfr. Part No.LM555CM/NOPB
£0.794
Each (In a Pack of 10)
Units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS Stock No. 100-0685
Mfr. Part No.LM555CM/NOPB
£1.122
Each (In a Tube of 95)
Units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS Stock No. 922-2690
Mfr. Part No.TLC555CDR
£0.228
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. 168-4873
Mfr. Part No.TLC555CD
£0.543
Each (In a Tube of 75)
Units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 662-4006
Mfr. Part No.TLC555CDR
£0.484
Each (In a Pack of 10)
Units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 788-334
Mfr. Part No.TLC555CD
£0.66
Each
Units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
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