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
$0.638
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. 186-9200
Mfr. Part No.MC14521BDG
$1.00
Each (In a Pack of 25)
units
- Frequency Divider - - - 120 ns 2600 ns @ 50 pF 150µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 168-5124
Mfr. Part No.SN54LS123J
$17.898
Each (In a Tube of 9)
units
LS Monostable Multivibrator 2 -0.4mA 4mA 40 ns 56 ns @ 5 V 12mA Through Hole CDIP 16 19.56 x 6.92 x 4.57mm 4.57mm 19.56mm
RS Stock No. 662-7658
Mfr. Part No.SN74AHC123APWR
$0.654
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. 184-4260
Mfr. Part No.MC14538BDWG
$0.954
Each (In a Tube of 47)
units
4000 Monostable Multivibrator 2 -4.2 (Minimum)mA 4.2 (Minimum)mA 5 ns 600 ns @ 50 pF 600µA Surface Mount SOIC 16 10.45 x 7.6 x 2.4mm 2.4mm 10.45mm
RS Stock No. 153-2888
Mfr. Part No.74HC123PW-Q100,118
BrandNexperia
$0.589
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. 171-3459
Mfr. Part No.74VHC221AFT
BrandToshiba
$0.419
Each (In a Pack of 50)
units
74VHC Monostable Multivibrator 27 -8mA 8mA 5 ns 24.5ns 80µA Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm
RS Stock No. 153-1982
Mfr. Part No.74HC123PW-Q100,118
BrandNexperia
$0.229
Each (On a Reel of 2500)
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. 186-8851
Mfr. Part No.MC14521BDG
$0.971
Each (In a Tube of 48)
units
- Frequency Divider - - - 120 ns 2600 ns @ 50 pF 150µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 186-9164
Mfr. Part No.MC100EL32DG
$9.11
Each (In a Pack of 2)
units
ECL Divider 2 - - - - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm
RS Stock No. 178-9175
Mfr. Part No.CD74HC221M
$1.178
Each (In a Tube of 40)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 12 ns 210 ns @ 2 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 303-927
Mfr. Part No.SN74221N
$8.76
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. 662-7358
Mfr. Part No.CD74HCT423M96
$1.01
Each (In a Pack of 5)
units
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
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. 170-8002
Mfr. Part No.HEF4538BT,653
BrandNexperia
$0.242
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
RS Stock No. 121-9215
Mfr. Part No.SN74AHC123APWR
$0.237
Each (On a Reel of 2000)
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. 145-5799
Mfr. Part No.SN74LS122D
$1.74
Each (In a Tube of 50)
units
LS Monostable Multivibrator 1 -0.4mA 8mA 40 ns 56 ns @ 5 V 6mA Surface Mount SOIC 14 8.65 x 3.91 x 1.58mm 1.58mm 8.65mm
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. 151-3419
Mfr. Part No.74HC4538PW,118
BrandNexperia
$0.567
Each (In a Pack of 25)
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. 170-8023
Mfr. Part No.HEF4047BT,653
BrandNexperia
$0.229
Each (On a Reel of 2500)
units
HEF - 1 -2.4mA 2.4mA 220 ns 320 ns @ 50 pF - Surface Mount SO 14 8.75 x 4 x 1.45mm 1.45mm 8.75mm
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