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. 663-2735
Mfr. Part No.SN74LV221AD
$2.008
Each (In a Pack of 5)
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. 162-4277
Mfr. Part No.SN74221N
$6.826
Each (In a Tube of 25)
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. 601-4128
Mfr. Part No.TC4538BF(F)
BrandToshiba
$2.344
Each (In a Pack of 5)
units
4000 Monostable Multivibrator 2 - - 25 ns 760 ns @ 5 V 20mA Surface Mount SOP 16 10.3 x 5.3 x 1.5mm 1.5mm 10.3mm
RS Stock No. 663-0023
Mfr. Part No.CD74HC123PW
$0.672
Each (In a Pack of 10)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 320 ns @ 2 V 0.008mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
RS Stock No. 919-8985
Mfr. Part No.LTC6993IS6-1TRMPBF
$4.007
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. 709-2071
Mfr. Part No.CD74HC123EE4
$0.844
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
New
RS Stock No. 186-9259
Mfr. Part No.74VHC123AM
$0.712
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. 153-1982
Mfr. Part No.74HC123PW-Q100,118
BrandNexperia
$0.225
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. 442-814
Mfr. Part No.SN74LS122N
$1.75
Each
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. 145-0702
Mfr. Part No.CD74HCT123M
$0.314
Each (In a Tube of 40)
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. 809-6273
Mfr. Part No.CD74HC221MT
$0.976
Each (On a Tape of 10)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 595 μs 315 ns@ 50 pF 160µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 178-7557
Mfr. Part No.74VHC123AMX
$0.287
Each (On a Reel of 2500)
units
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
RS Stock No. 171-3598
Mfr. Part No.74VHC123AFT
BrandToshiba
$0.329
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. 145-6019
Mfr. Part No.SN74LV221AD
$1.029
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. 151-3348
Mfr. Part No.74HC123PW,118
BrandNexperia
$0.194
Each (On a Reel of 2500)
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
RS Stock No. 807-2343
Mfr. Part No.CD14538BM
$0.56
Each (In a Pack of 40)
units
4000 Monostable Multivibrator 2 -4.2mA 4.2mA 140 ns 600 ns@ 50 pF 3000µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 662-7005
Mfr. Part No.CD74HC123M96
$0.637
Each (In a Pack of 10)
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. 662-7064
Mfr. Part No.CD74HC221PWR
$0.926
Each (In a Pack of 5)
units
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
New
RS Stock No. 186-8798
Mfr. Part No.74VHC123AM
$0.712
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. 103-8390
Mfr. Part No.HEF4047BT,652
BrandNexperia
$0.382
Each (In a Tube of 57)
units
4000 Monostable Multivibrator 1 - - 70 ns 320 ns @ 5 V 0.08mA Surface Mount SOIC 14 8.75 x 4 x 1.45mm 1.45mm 8.75mm
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