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. 178-9223
Mfr. Part No.CD74HC221MT
£0.675
Each (In a Tube of 40)
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. 663-0477
Mfr. Part No.CD74HCT123M
£0.504
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. 809-6273
Mfr. Part No.CD74HC221MT
£0.314
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. 662-7226
Mfr. Part No.CD74HCT123M96
£0.079
Each (In a Pack of 10)
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. 162-6965
Mfr. Part No.CD74HCT123M96
£0.077
Each (On a Reel of 2500)
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. 145-0702
Mfr. Part No.CD74HCT123M
£0.41
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. 146-0850
Mfr. Part No.74HCT4538D,112
BrandNexperia
£0.434
Each (In a Tube of 50)
Units
HCT Monostable Multivibrator 2 -5.2mA 5.2mA 16 ns 90 ns @ 4.5 V 0.008mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 162-4277
Mfr. Part No.SN74221N
£3.85
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. 761-4381
Mfr. Part No.74VHC123AMX
£0.371
Each (In a Pack of 10)
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. 816-4641
Mfr. Part No.74HCT123PW,112
BrandNexperia
£0.197
Each (In a Pack of 32)
Units
HCT Monostable Multivibrator 1 -4mA 4mA 150 ns 385 ns@ 50 pF - Surface Mount TSSOP 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 125-0045
Mfr. Part No.MC74HC4538ADG
£0.364
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. 178-7557
Mfr. Part No.74VHC123AMX
£0.149
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. 303-927
Mfr. Part No.SN74221N
£4.38
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. 528-078
Mfr. Part No.CD74HC4538M96
£0.095
Each (In a Pack of 25)
Units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 14 ns 250 ns @ 2 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
£0.476
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. 662-8364
Mfr. Part No.SN74LS123DR
£0.58
Each (In a Pack of 5)
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. 186-8798
Mfr. Part No.74VHC123AM
£0.397
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. 922-2833
Mfr. Part No.SN74LS123DR
£0.227
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. 146-0416
Mfr. Part No.74HCT123PW,112
BrandNexperia
£0.077
Each (In a Tube of 96)
Units
HCT Monostable Multivibrator 1 -4mA 4mA 150 ns 385 ns @ 50 pF - Surface Mount TSSOP 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 178-8815
Mfr. Part No.CD74HC123PWR
£0.39
Each (In a Tube of 90)
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
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