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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Part Details Brand 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 Dimensions Length Width Height Series Propagation Delay Test Condition
CR Control Timer ICs
  • RS Stock No. 185-1005
  • Brand ROHM
  • Mfr. Part No. BD9555FVM-CGTR
ROHM Surface Mount - MSOP 1 8 - 4.5 V 42 V -40 °C +125 °C - 50mA -10mA - 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm - -
CR Control Timer ICs
  • £ 0.332
  • Each (On a Reel of 3000)
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  • RS Stock No. 185-0950
  • Brand ROHM
  • Mfr. Part No. BD9555FVM-CGTR
ROHM Surface Mount - MSOP 1 8 - 4.5 V 42 V -40 °C +125 °C - 50mA -10mA - 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm - -
Nexperia HEF4541BT,512, Programmable Timer Circuit 36MHz, 14-Pin SOIC Nexperia Surface Mount Programmable SOIC 1 14 36MHz 3 V 15 V -40 °C +85 °C - 4.2mA -4.2mA 1150 ns @ 5 V 8.75 x 4 x 1.45mm 8.75mm 4mm 1.45mm - -
ON Semiconductor LM555CM, Timer, 8-Pin SOIC ON Semiconductor Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA - 5 x 4 x 1.5mm 5mm 4mm 1.5mm - -
ON Semiconductor MC14541BDG, Programmable Timer Circuit 3MHz, 14-Pin SOIC ON Semiconductor 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 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm - -
Texas Instruments TLC556IDR, Timer Circuit, Dual 2MHz, 14-Pin SOIC Texas Instruments Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA - 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm - -
Texas Instruments NE556N, Timer Circuit, Dual, 14-Pin PDIP Texas Instruments Through Hole Standard PDIP 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA - 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm - -
ON Semiconductor FT8010UMX, Timer Circuit, 10-Pin UMLP ON Semiconductor Surface Mount Reset UMLP 1 10 - 1.8 V 5 V -40 °C +85 °C 20µA 50mA -50mA 310ns 1.4 x 1.8 x 0.5mm 1.4mm 1.8mm 0.5mm - 5pF
ON Semiconductor LM555CM, Timer, 8-Pin SOIC ON Semiconductor Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA - 5 x 4 x 1.5mm 5mm 4mm 1.5mm - -
ON Semiconductor MC1455DG, Timer Circuit, 8-Pin SOIC ON Semiconductor Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA - 5 x 4 x 1.5mm 5mm 4mm 1.5mm - -
Texas Instruments TLC555IDR, Timer Circuit 2MHz, 8-Pin SOIC Texas Instruments Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA - 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm - -
ON Semiconductor FT3001MPX, Precision Timer, 4, 8-Pin MLP ON Semiconductor Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns 2 x 2 x 0.75mm 2mm 2mm 0.75mm - 5pF
Texas Instruments LMC555CM/NOPB, Timer Circuit 3MHz, 8-Pin SOIC Texas Instruments Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns @ 5 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm - -
ON Semiconductor LM555CN, Timer, 8-Pin PDIP ON Semiconductor Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA - 10.15 x 6.35 x 3.15mm 10.15mm 6.35mm 3.15mm - -
STMicroelectronics STWD100YNPWY3F, Watchdog Timer, 5-Pin SOT-23 STMicroelectronics Surface Mount Watchdog SOT-23 1 5 - 2.7 V 5.5 V -40 °C +125 °C - - - - 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm - -
ON Semiconductor MC1455DR2G, Timer Circuit, 8-Pin SOIC ON Semiconductor Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA - 5 x 4 x 1.5mm 5mm 4mm 1.5mm - -
DiodesZetex NA555S-13, Precision Timer Circuit, 8-Pin SOIC DiodesZetex Surface Mount Precision SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C - 200mA -200mA - 4.95 X 3.95 X 1.5mm 4.95mm 3.95mm 1.5mm - -
Renesas Electronics ICM7242IPAZ, Timer Circuit 13MHz, 8-Pin PDIP Renesas Electronics Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - - 10.16 x 8.25 x 4.95mm 10.16mm 8.25mm 4.95mm - -
Texas Instruments SE555P, Timer Circuit, 8-Pin PDIP Texas Instruments Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA - 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm - -
Texas Instruments CD4541BEE4, Programmable Timer Circuit 0.1MHz, 14-Pin PDIP Texas Instruments 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 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm - -
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