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 165-8349
製造零件編號NA555S-13
HK$1.16
個 (在毎卷:2500)
單位
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C - 200mA -200mA -
RS庫存編號 112-5368
製造零件編號NE556D
HK$4.62
單位
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
全新
RS庫存編號 197-7335
製造零件編號LMC555CM/NOPB
HK$9.678
/個 (每包:10個)
單位
- - SOIC - 8 - - - - - - - - -
RS庫存編號 189-7189
製造零件編號ICM7555IPA+
HK$25.24
毎管:50 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 190-4886
製造零件編號ICM7555ESA+
HK$12.681
毎管:100 個
單位
Surface Mount - SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
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 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 -
RS庫存編號 346-7024
製造零件編號TLC555IP
HK$23.10
單位
Through Hole Standard PDIP 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS庫存編號 858-0891
製造零件編號LTC6993CS6-4#TRMPBF
HK$30.756
/個 (每包:5個)
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 662-4696
製造零件編號TLC556IN
HK$13.61
/個 (每包:5個)
單位
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS庫存編號 922-2690
製造零件編號TLC555CDR
HK$2.41
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 145-0368
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 178-7003
製造零件編號HEF4541BT,512
BrandNexperia
HK$4.511
毎管:57 個
單位
Surface Mount Programmable SOIC 1 14 36MHz 3 V 15 V -40 °C +85 °C - 4.2mA -4.2mA 1150 ns @ 5 V
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 920-0177
製造零件編號LTC6994IS6-1#TRMPBF
HK$21.542
個 (在毎卷:500)
單位
Surface Mount Programmable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 24 ns @ 5 pF
RS庫存編號 162-6643
製造零件編號NA555DR
HK$0.847
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C 15mA 200mA -200mA 300 ns @ 15 pF
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 788-334
製造零件編號TLC555CD
HK$7.44
單位
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 162-7093
製造零件編號TLC555QDR
HK$4.281
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 2MHz 5 V 15 V -40 °C +125 °C - 100mA -10mA -
全新
RS庫存編號 197-7495
製造零件編號SE555JG
HK$86.849
毎管:50 個
單位
- - CDIP - 8 - - - - - - - - -