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. 540-7692
Mfr. Part No.TC74HC123AF(F)
BrandToshiba
$1.372
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 13 ns 210 ns @ 2 V 0.004mA Surface Mount SOP 16 10.3 x 5.3 x 1.5mm 1.5mm 10.3mm
RS Stock No. 601-4134
Mfr. Part No.TC4538BP(F)
BrandToshiba
$1.702
Each (In a Pack of 5)
units
4000 Monostable Multivibrator 2 - - 25 ns 760 ns @ 5 V 20mA Through Hole PDIP 16 19.25 x 6.4 x 3.5mm 3.5mm 19.25mm
RS Stock No. 662-9635
Mfr. Part No.CD4047BM
$0.826
Each (In a Pack of 5)
units
4000 Monostable Multivibrator 1 - - 50 ns 1000 ns @ 5 V 0.02mA Surface Mount SOIC 14 8.65 x 3.91 x 1.58mm 1.58mm 8.65mm
RS Stock No. 307-632
Mfr. Part No.SN74LS123N
$1.27
Each
units
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
RS Stock No. 368-5660
Mfr. Part No.SN74123N
$7.54
Each (In a Tube of 25)
units
74 Monostable Multivibrator 2 -0.8mA 16mA 40 ns 40 ns @ 5 V 46mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 145-0153
Mfr. Part No.CD74HC4538EE4
$0.54
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. 663-0385
Mfr. Part No.CD74HC4538EE4
$1.548
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. 663-0357
Mfr. Part No.CD74HC423M
$1.13
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 320 ns @ 2 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 653-2244
Mfr. Part No.BAS70-06W,115
BrandNexperia
$0.332
Each (In a Pack of 10)
units
- - 2 - - - - - Surface Mount UMT 3 1 x 2.2 x 1.35mm 1mm 2.2mm
RS Stock No. 153-2888
Mfr. Part No.74HC123PW-Q100,118
BrandNexperia
$0.57
Each (In a Pack of 25)
units
74HC Monostable Multivibrator 2 -5.2mA 5.2mA 26 ns 385 ns @ 50 pF - Surface Mount TSSOP 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 145-3681
Mfr. Part No.MC14538BDTR2G
$0.339
Each (On a Reel of 2500)
units
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
RS Stock No. 919-8985
Mfr. Part No.LTC6993IS6-1TRMPBF
$4.026
Each (On a Reel of 500)
units
LVCMOS, LVTTL Monostable Multivibrator 2 -16mA 16mA 1 μs 28ns 0.2mA Surface Mount TSOT-23 6 2.9 x 1.75 x 1mm 1mm 2.9mm
RS Stock No. 170-4890
Mfr. Part No.74LVC1G123DP,125
BrandNexperia
$0.315
Each (On a Reel of 3000)
units
74LVC Monostable Multivibrator 1 -32mA 32mA 2.5 ns 20.3 ns @ 50 pF 20µA Surface Mount TSSOP 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm
RS Stock No. 162-7430
Mfr. Part No.SN74LV221APWR
$0.864
Each (On a Reel of 2000)
units
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
RS Stock No. 806-3295
Mfr. Part No.MC14528BDR2G
$0.737
Each (On a Tape of 20)
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. 186-8798
Mfr. Part No.74VHC123AM
$0.758
Each (In a Tube of 48)
units
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
RS Stock No. 145-1019
Mfr. Part No.CD74HCT221M
$0.887
Each (In a Tube of 40)
units
HCT Monostable Multivibrator 2 -4mA 4mA 14 ns 42 ns @ 4.5 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 186-9259
Mfr. Part No.74VHC123AM
$0.758
Each (In a Pack of 25)
units
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
RS Stock No. 662-7658
Mfr. Part No.SN74AHC123APWR
$0.58
Each (In a Pack of 10)
units
AHC Monostable Multivibrator 2 -8mA 8mA 5 ns 24.1 ns @ 3.3 V 0.004mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
RS Stock No. 151-3398
Mfr. Part No.74HC123PW,118
BrandNexperia
$0.503
Each (In a Pack of 50)
units
HC Monostable Multivibrator 2 -4mA 4mA 26 ns 385 ns @ 15 pF - Surface Mount TSSOP16 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
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