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. 806-3295
Mfr. Part No.MC14528BDR2G
PHP12.867
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. 923-2350
Mfr. Part No.SN74LS123N
PHP21.462
Each (In a Tube of 25)
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. 303-927
Mfr. Part No.SN74221N
PHP206.18
Each
units
74 Monostable Multivibrator 2 -0.8mA 16mA 20 ns 80 ns @ 5 V 26mA 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
PHP22.366
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. 125-0045
Mfr. Part No.MC74HC4538ADG
PHP20.914
Each (In a Tube of 48)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 10 ns 295 ns @ 50 pF 0.35mA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 662-7351
Mfr. Part No.CD74HCT4538M96
PHP30.45
Each (In a Pack of 10)
units
HCT Monostable Multivibrator 2 -4mA 4mA 16 ns 55 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. 305-591
Mfr. Part No.SN74121N
PHP104.50
Each
units
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
RS Stock No. 368-5654
Mfr. Part No.SN74121N
PHP104.50
Each (In a Tube of 25)
units
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
RS Stock No. 540-0001
Mfr. Part No.TC74HC423AP(F)
BrandToshiba
PHP77.388
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 13 ns 210 ns @ 2 V 0.004mA Through Hole PDIP 16 19.25 x 6.4 x 3.5mm 3.5mm 19.25mm
RS Stock No. 144-9936
Mfr. Part No.CD4047BEE4
PHP14.092
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. 162-6981
Mfr. Part No.CD74HCT4538M96
PHP14.749
Each (On a Reel of 2500)
units
HCT Monostable Multivibrator 2 -4mA 4mA 16 ns 55 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. 145-6019
Mfr. Part No.SN74LV221AD
PHP40.81
Each (In a Tube of 40)
units
LV Monostable Multivibrator 2 -12mA 12mA 5 ns 36 ns @ 2.5 V 0.02mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 151-3351
Mfr. Part No.74HC4538PW,118
BrandNexperia
PHP10.563
Each (On a Reel of 2500)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 20 ns 400 ns @ 15 pF - Surface Mount TSSOP16 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 145-1068
Mfr. Part No.SN74AHC123AD
PHP10.339
Each (In a Tube of 40)
units
AHC Monostable Multivibrator 2 -8mA 8mA 5 ns 24.1 ns @ 3.3 V 0.004mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 186-8798
Mfr. Part No.74VHC123AM
PHP26.833
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. 653-2244
Mfr. Part No.BAS70-06W,115
BrandNexperia
PHP5.851
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. 162-7430
Mfr. Part No.SN74LV221APWR
PHP32.716
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. 162-6973
Mfr. Part No.CD74HCT221M96
PHP13.171
Each (On a Reel of 2500)
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. 527-467
Mfr. Part No.CD14538BE
PHP19.546
Each (In a Tube of 25)
units
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
RS Stock No. 170-8002
Mfr. Part No.HEF4538BT,653
BrandNexperia
PHP8.30
Each (On a Reel of 2500)
units
HEF Monostable Multivibrator 2 -2.4mA 2.4mA 90 ns 460 ns @ 50 pF - Surface Mount SO 16 10 x 4 x 1.45mm 1.45mm 10mm
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