74HC(T)123

Dual retriggerable monostable multivibrator with reset

The 74HC123; 74HCT123 are high-speed Si-gate CMOS devices and are pin compatible with Low-power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74HC123; 74HCT123 are dual retriggerable monostable multivibrators with output pulse width control by three methods:

  1. The basic pulse is programmed by selection of an external resistor (REXT) and capacitor (CEXT).
  2. Once triggered, the basic output pulse width may be extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made as long as desired. Alternatively an output delay can be terminated at any time by a LOW-going edge on input nRD, which also inhibits the triggering.
  3. An internal connection from nRD to the input gates makes it possible to trigger the circuit by a HIGH-going signal at input nRD as shown in the function table.

Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise and fall times.

The 74HC123; 74HCT123 are identical to the 74HC423; 74HCT423 but can be triggered via the reset input.

Features

  • DC triggered from active HIGH or active LOW inputs
  • Retriggerable for very long pulses up to 100 % duty factor
  • Direct reset terminates output pulse
  • Schmitt-trigger action on all inputs except for the reset input
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Specified from -40 ℃ to +85 ℃ and from -40 ℃ to +125 ℃

Parametrics

Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74HC123BQProduction2.0 - 6.0CMOS± 7.89.0low-40~1259011.859DHVQFN16
74HC123DProduction2.0 - 6.0CMOS± 5.226low-40~125908.349SO16
74HC123DB
NRND
Not for design in2.0 - 6.0CMOS+/- 5.226low-40~12514842.0SSOP16
74HC123PWProduction2.0 - 6.0CMOS± 5.226low-40~1251223.951.5TSSOP16
74HCT123DProduction4.5 - 5.5TTL± 426low-40~125908.349SO16
74HCT123DB
NRND
Not for design in4.5 - 5.5TTL+/- 426low-40~12514842.0SSOP16
74HCT123PWProduction4.5 - 5.5TTL± 426low-40~1251223.951.5TSSOP16

Package

Type numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC123BQ
DHVQFN16
(SOT763-1)
SOT763-1Reel 7" Q1/T1ActiveHC12374HC123BQ,115
( 9352 824 53115 )
74HC123D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HC123D74HC123D,653
( 9337 139 60653 )
Bulk Pack, CECCActive74HC123D74HC123D,652
( 9337 139 60652 )
74HC123DB
NRND

SSOP16
(SOT338-1)
SOT338-1SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC12374HC123DB,118
( 9351 903 30118 )
Bulk PackActiveHC12374HC123DB,112
( 9351 903 30112 )
74HC123PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC12374HC123PW,118
( 9351 868 60118 )
Bulk PackActiveHC12374HC123PW,112
( 9351 868 60112 )
74HCT123D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HCT123D74HCT123D,653
( 9337 139 70653 )
Bulk Pack, CECCActive74HCT123D74HCT123D,652
( 9337 139 70652 )
74HCT123DB
NRND

SSOP16
(SOT338-1)
SOT338-1SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHCT12374HCT123DB,118
( 9351 868 40118 )
Bulk PackActiveHCT12374HCT123DB,112
( 9351 868 40112 )
74HCT123PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHCT12374HCT123PW,118
( 9351 868 50118 )
Bulk PackActiveHCT12374HCT123PW,112
( 9351 868 50112 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC123BQ74HC123BQ,11574HC123BQAlways Pb-free84.96.621.51E811
74HC123D74HC123D,65374HC123Dweek 30, 200484.96.621.51E811
74HC123D74HC123D,65274HC123Dweek 30, 200484.96.621.51E811
74HC123DB
NRND
74HC123DB,11874HC123DBweek 13, 200511
74HC123DB
NRND
74HC123DB,11274HC123DBweek 13, 200511
74HC123PW74HC123PW,11874HC123PWweek 10, 200584.96.621.51E811
74HC123PW74HC123PW,11274HC123PWweek 10, 200584.96.621.51E811
74HCT123D74HCT123D,65374HCT123Dweek 6, 200484.96.621.51E811
74HCT123D74HCT123D,65274HCT123Dweek 6, 200484.96.621.51E811
74HCT123DB
NRND
74HCT123DB,11874HCT123DBweek 12, 200511
74HCT123DB
NRND
74HCT123DB,11274HCT123DBweek 12, 200511
74HCT123PW74HCT123PW,11874HCT123PWweek 10, 200584.96.621.51E811
74HCT123PW74HCT123PW,11274HCT123PWweek 10, 200584.96.621.51E811
Quality and reliability disclaimer

Documentation (22)

File nameTitleTypeDate
74HC_HCT123Dual retriggerable monostable multivibrator with resetData sheet2017-03-30
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
nexperia_selection_guide_2019_201901Selection guide 2019. Discretes, Logic and MOSFETsSelection guide2018-12-12
hchc Spice modelSPICE model2013-05-06
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
SOT763-1_115DHVQFN16; Reel pack, SMD, 7" Q1/T1 standard product orientation Orderable part number ending ,115 or X Ordering code (12NC) ending 115Packing2016-07-05
SOT763-1plastic, leadless dual in-line compatible thermal enhanced very thin quad flat package; 16 terminals; 0.5 mm pitch; 3.5 mm x 2.5 mm x 1 mm bodyOutline drawing2018-11-14
SOT109-1_431SO16; Reel sulfur barrier pack, SMD, 13" Q1/T1 standard product orientation Orderable part number ending ,431 or Z Ordering code (12NC) ending 431Packing2016-08-25
SOT109-1_118SO16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packing2013-04-24
SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm bodyOutline drawing2018-10-18
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT403-1_623TSSOP16; Reel pack; SMD, 13"; Q1 Standard product orientation; Orderable part number ending, 623 or HL; Ordering code (12NC) ending 623Packing2013-05-15
SOT403-1_118TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packing2013-04-08
SOT403-1_128TSSOP16; Reel pack; SMD, 13", Turned Q4/T2 180 deg product orientation Orderable part number ending ,128 or HP Ordering code (12NC) ending 128Packing2014-10-14
SOT403-1_653TSSOP16; Reel pack; SMD, 13"; Q1 Standard product orientation; Orderable part number ending, 653 or HL; Ordering code (12NC) ending 653Packing2013-05-15
SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.1 mm bodyOutline drawing2018-11-14
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT338-1_431SSOP16; Reel pack, SMD, 13" Q1/T1 standard product orientation Orderable part number ending ,431 or Z Ordering code (12NC) ending 431Packing2016-10-05
SOT338-1plastic, shrink small outline package; 16 leads; 0.65 mm pitch; 6.2 mm x 5.3 mm x 2 mm bodyOutline drawing2018-10-18
SSOP-TSSOP-VSO-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08

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Models

File nameTitleTypeDate
hchc Spice modelSPICE model2013-05-06

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