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 662-4009
製造零件編號TLC555QDR
TWD20.90
/個 (每包:10個)
單位
Surface Mount Standard SOIC 1 8 2MHz 5 V 15 V -40 °C +125 °C - 100mA -10mA -
RS庫存編號 145-0368
製造零件編號SE555D
TWD4.50
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 660-7761
製造零件編號SE555D
TWD18.00
/個 (每包:5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 169-8718
製造零件編號LM555CN
TWD4.80
個 (在毎卷:3000)
單位
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS庫存編號 121-8449
製造零件編號TLC555CP
TWD21.00
毎管:50 個
單位
Through Hole Standard PDIP 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 806-2835
製造零件編號LM555CN
TWD9.70
毎管:50 個
單位
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS庫存編號 638-942
製造零件編號TLC555CP
TWD20.00
單位
Through Hole Standard PDIP 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 534-3992
製造零件編號LMC555CM/NOPB
TWD31.00
單位
Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS庫存編號 620-0357
製造零件編號TLC555ID
TWD22.70
/個 (每包:10個)
單位
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS庫存編號 121-8948
製造零件編號TLC555ID
TWD13.00
毎管:75 個
單位
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS庫存編號 121-8803
製造零件編號LMC555CM/NOPB
TWD28.90
毎管:95 個
單位
Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns @ 5 V
RS庫存編號 528-410
製造零件編號TLC555IDR
TWD21.30
/個 (每包:25個)
單位
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS庫存編號 910-1733
製造零件編號MIC1555YM5-TR
BrandMicrochip
TWD17.90
/個 (每包:10個)
單位
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS庫存編號 662-3999
製造零件編號NE555PWR
TWD5.40
/個 (每包:10個)
單位
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS庫存編號 162-7010
製造零件編號NE555PWR
TWD3.40
個 (在毎卷:2000)
單位
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS庫存編號 165-4290
製造零件編號MIC1555YM5-TR
BrandMicrochip
TWD14.80
個 (在毎卷:3000)
單位
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS庫存編號 921-5374
製造零件編號ICM7555IPAZ
TWD22.70
/個 (每包:10個)
單位
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS庫存編號 145-4759
製造零件編號MC1455BDR2G
TWD6.60
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS庫存編號 184-0871
製造零件編號ICM7555CBAZ
BrandIntersil
TWD19.00
單位
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V 0 °C +70 °C - 20mA -0.8mA -
RS庫存編號 121-9248
製造零件編號SE555P
TWD9.30
毎管:50 個
單位
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -