Monostable Multivibrators

Monostable multivibrators, also known as one-shot multivibrators, are a type of electronic circuit that can be used as a timer. They have one stable and one unstable state. The unstable state is caused by a trigger pulse. This state is transient, so the circuit always returns to stability after a fixed time has elapsed. 


Generally, monostable multivibrator circuits are composed of two transistors, coupled with one resistor-capacitor network and one resistor network. These networks are what determines the length of time before the circuit returns to its stable state, after being triggered. 


What are monostable multivibrators used for?

Monostable multivibrators are used to produce a specific timed delay within a circuit. Therefore, they can broadly be used as timers or as pulse detectors in electronic equipment. 


Types of monostable multivibrators

There are two types of monostable multivibrators:

  • Retriggerable monostable multivibrators will remain in the unstable state with repeated application of the trigger pulse.
  • Non-retriggerable monostable multivibrators are unaffected by further trigger pulses, and will remain in the unstable state only for the predetermined period of time. 

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Beskrivning Pris Logic Family Logic Function Number of Elements per Chip Maximum High Level Output Current Maximum Low Level Output Current Minimum Pulse Width Maximum Propagation Delay Time @ Maximum CL Maximum Quiescent Current Mounting Type Package Type Pin Count Dimensions Height Length
RS-artikelnummer 368-5654
Tillv. art.nrSN74121N
VarumärkeTexas Instruments
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74 Monostable Multivibrator 1 -0.4mA 16mA 50 ns 80 ns @ 5 V 13mA Through Hole PDIP 14 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
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Tillv. art.nrSN74121N
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74 Monostable Multivibrator 1 -0.4mA 16mA 50 ns 80 ns @ 5 V 13mA Through Hole PDIP 14 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
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Tillv. art.nrCD14538BE
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4000 Monostable Multivibrator 2 - - 30 ns 600 ns @ 5 V 0.1mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
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LS Monostable Multivibrator 1 -0.4mA 8mA 40 ns 56 ns @ 5 V 6mA Through Hole PDIP 14 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
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Tillv. art.nrMC14538BDTR2G
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MC Monostable Multivibrator 2 -0.36mA 2.4mA 10 μs 600 ns @ 50 pF - Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 1.05mm 5.1mm
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Tillv. art.nrSN74LV221APWR
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LV Monostable Multivibrator 2 -12mA 12mA 5 ns 36 ns @ 2.5 V 0.02mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
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LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 56 ns @ 5 V 12mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
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4000 Monostable Multivibrator 2 - - 80 ns 600 ns @ 5 V 0.7mA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
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Tillv. art.nrCD74HC123E
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HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 320 ns @ 2 V 0.008mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
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Tillv. art.nrSN74LS123N
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LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 56 ns @ 5 V 12mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
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Tillv. art.nrCD74HC4538E
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HC Monostable Multivibrator 2 -5.2mA 5.2mA 14 ns 250 ns @ 2 V 0.008mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
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Tillv. art.nrCD74HC221PWR
VarumärkeTexas Instruments
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HC Monostable Multivibrator 2 -5.2mA 5.2mA 12 ns 210 ns @ 2 V 0.008mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
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74VHC Monostable Multivibrator 2 -25mA 25mA 90 μs 29.5ns 0.04mA Surface Mount SOIC 16 9.9 x 3.9 x 1.45mm 1.45mm 9.9mm
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4000 Monostable Multivibrator 2 - - 20 ns 305 ns @ 5 V 0.08mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
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LS Monostable Multivibrator 1 -0.4mA 8mA 40 ns 56 ns @ 5 V 6mA Through Hole PDIP 14 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
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HCT Monostable Multivibrator 2 -4mA 4mA 20 ns 68 ns @ 4.5 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
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VHC Monostable Multivibrator 8 -8mA 8mA 5 ns 29.5 ns @ 50 pF 40µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
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LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 56 ns @ 5 V 12mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
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HC Monostable Multivibrator 2 -5.2mA 5.2mA 14 ns 250 ns @ 2 V 0.008mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
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4000 Monostable Multivibrator 1 - - 50 ns 1000 ns @ 5 V 0.02mA Through Hole PDIP 14 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm