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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Description Price 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 Stock No. 640-131
Mfr. Part No.SN74LS221N
MYR4.93
Each
units
LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 80 ns @ 5 V 4.7mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 145-0828
Mfr. Part No.SN74LS221N
MYR2.885
Each (In a Tube of 25)
units
LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 80 ns @ 5 V 4.7mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 709-2071
Mfr. Part No.CD74HC123EE4
MYR2.45
Each (In a Pack of 5)
units
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
RS Stock No. 145-1086
Mfr. Part No.CD74HC123EE4
MYR1.014
Each (In a Tube of 25)
units
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
RS Stock No. 527-895
Mfr. Part No.CD4047BE
MYR1.753
Each (In a Tube of 25)
units
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
RS Stock No. 527-293
Mfr. Part No.CD4098BE
MYR1.831
Each (In a Tube of 25)
units
4000 Monostable Multivibrator 2 - - 20 ns 500 ns @ 5 V 0.02mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 807-2463
Mfr. Part No.CD74HC423E
MYR2.603
Each (In a Pack of 25)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 150 ns 450 ns@ 50 pF 160µA Through Hole PDIP 16 19.69 x 6.6 x 4.57mm 4.57mm 19.69mm
RS Stock No. 527-647
Mfr. Part No.CD74HC4538E
MYR2.384
Each (In a Tube of 25)
units
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
RS Stock No. 662-9626
Mfr. Part No.CD4047BEE4
MYR3.164
Each (In a Pack of 5)
units
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
RS Stock No. 144-9936
Mfr. Part No.CD4047BEE4
MYR1.192
Each (In a Tube of 25)
units
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
RS Stock No. 922-2833
Mfr. Part No.SN74LS123DR
MYR1.14
Each (On a Reel of 2500)
units
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
RS Stock No. 170-3571
Mfr. Part No.MC14528BDR2G
MYR0.879
Each (On a Reel of 2500)
units
MC Monostable Multivibrator 2 -0.36mA 2.4mA 10 μs 1000 ns @ 50 pF - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 663-2460
Mfr. Part No.SN74LS221D
MYR4.746
Each (In a Pack of 5)
units
LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 80 ns @ 5 V 4.7mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 178-9210
Mfr. Part No.SN74LS221D
MYR6.89
Each (In a Tube of 40)
units
LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 80 ns @ 5 V 4.7mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 145-0153
Mfr. Part No.CD74HC4538EE4
MYR1.391
Each (In a Tube of 25)
units
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
RS Stock No. 178-4724
Mfr. Part No.MC14528BDG
MYR2.08
Each (In a Tube of 48)
units
4000 Monostable Multivibrator 2 - - 55 ns 650 ns @ 5 V 0.02mA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 809-5983
Mfr. Part No.SN74LVC1G123DCTR
MYR1.888
Each (In a Pack of 15)
units
LVC Monostable Multivibrator 1 -32mA 32mA 2.5 ns - 20µA Surface Mount SM 8 3.15 x 2.9 x 1.2mm 1.2mm 3.15mm
RS Stock No. 663-0385
Mfr. Part No.CD74HC4538EE4
MYR4.782
Each (In a Pack of 5)
units
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
RS Stock No. 368-5991
Mfr. Part No.SN74LS122N
MYR3.227
Each (In a Tube of 25)
units
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
RS Stock No. 518-9445
Mfr. Part No.MC14528BDG
MYR2.38
Each
units
4000 Monostable Multivibrator 2 - - 55 ns 650 ns @ 5 V 0.02mA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
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