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 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庫存編號 191-4247
製造零件編號ICM7556IPD+
HK$35.485
毎管:25 個
單位
Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -
RS庫存編號 145-0078
製造零件編號TLC556CN
HK$10.70
毎管:25 個
單位
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 190-4887
製造零件編號ICM7556ISD+
HK$32.754
毎管:50 個
單位
Surface Mount - SOIC 1 14 - 2 V 18 V -20 °C +85 °C - - - -
RS庫存編號 185-0950
製造零件編號BD9555FVM-CGTR
BrandROHM
HK$5.13
個 (在毎卷:3000)
單位
Surface Mount - MSOP 1 8 - 4.5 V 42 V -40 °C +125 °C - 50mA -10mA -
RS庫存編號 189-8665
製造零件編號ICM7555IPA+
HK$29.78
/個 (每包:5個)
單位
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
RS庫存編號 190-4883
製造零件編號DS1100LZ-50+
HK$43.33
毎管:100 個
單位
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS庫存編號 662-4006
製造零件編號TLC555CDR
HK$5.15
/個 (每包:10個)
單位
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 145-1217
製造零件編號TLC551CD
HK$15.419
毎管:75 個
單位
Surface Mount Standard SOIC 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 156-5697
製造零件編號LTC6993CS6-4#TRMPBF
HK$19.676
個 (在毎卷:500)
單位
Surface Mount Monostable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 28 ns @ 5 pF
RS庫存編號 190-5917
製造零件編號ICM7240IPE+
HK$51.60
/個 (每包:2個)
單位
Through Hole - PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
RS庫存編號 809-6232
製造零件編號CD4541BPW
HK$3.47
/個 (每包:15個)
單位
Surface Mount Programmable TSSOP 1 14 6MHz 3 V 18 V -55 °C +125 °C 100µA 12.6mA -12.6mA 18 μs@ 50 pF
RS庫存編號 190-5926
製造零件編號ICM7242IPA+
HK$43.888
/個 (每包:5個)
單位
Through Hole - PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
RS庫存編號 662-4677
製造零件編號TLC551CP
HK$16.45
/個 (每包:5個)
單位
Through Hole Standard PDIP 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 709-2110
製造零件編號SE555P
HK$3.486
/個 (每包:5個)
單位
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
全新
RS庫存編號 196-2111
製造零件編號TS555IDTTR
HK$4.044
個 (在毎卷:2500)
單位
Surface Mount Monostable SO 2 8 2.7MHz 2 V 16 V -40 °C +125 °C - 1mA -0.3mA -
RS庫存編號 787-8706
製造零件編號MC1455DR2G
HK$3.20
/個 (每包:20個)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS庫存編號 921-5951
製造零件編號ICM7242IPAZ
HK$48.00
/個 (每包:2個)
單位
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS庫存編號 145-0368
製造零件編號SE555D
HK$3.481
毎管:75 個
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS庫存編號 787-779
製造零件編號TLC556CD
HK$13.09
單位
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
全新
RS庫存編號 196-8891
製造零件編號ICM7555IBAZ-T
HK$5.485
/個 (每包:25個)
單位
- Standard SOIC - 8 1MHz - - - - - - - -