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74HC244; 74HCT244

Octal buffer/line driver; 3-state

The 74HC244; 74HCT244 is an 8-bit buffer/line driver with 3-state outputs. The device can be used as two 4-bit buffers or one 8-bit buffer. The device features two output enables (1OE and 2OE), each controlling four of the 3-state outputs. A HIGH on nOE causes the outputs to assume a high-impedance OFF-state. Inputs include clamp diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Features and benefits

  • Wide supply voltage range from 2.0 to 6.0 V
  • CMOS low power dissipation
  • High noise immunity
  • Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
  • Input levels:
    • For 74HC244: CMOS level
    • For 74HCT244: TTL level
  • Octal bus interface
  • Non-inverting 3-state outputs
  • Complies with JEDEC standards:
    • JESD8C (2.7 V to 3.6 V)
    • JESD7A (2.0 V to 6.0 V)
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Multiple package options
  • Specified from -40 °C to +85 °C and -40 °C to +125 °C

Parametrics

Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)fmax (MHz)No of bitsPower dissipation considerationsTamb (°C)Rth(j-a) (K/W)Rth(j-c) (K/W)Package name
74HC244BQProduction2.0 - 6.0CMOS± 7.8368low-40~1257850DHVQFN20
74HC244DProduction2.0 - 6.0CMOS± 7.8368low-40~1258561SO20
74HC244PWProduction2.0 - 6.0CMOS± 7.8368low-40~12510044.9TSSOP20
74HCT244BQProduction4.5 - 5.5TTL± 6368low-40~1257850DHVQFN20
74HCT244DProduction4.5 - 5.5TTL± 6368low-40~1258561SO20
74HCT244PWProduction4.5 - 5.5TTL± 6368low-40~12510044.9TSSOP20

Package

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC244BQ
DHVQFN20
(SOT764-1)
SOT764-1Reel 7” Q1/T1 or Q2/T3ActiveHC24474HC244BQ,115
( 9352 736 78115 )
74HC244D
SO20
(SOT163-1)
SOT163-1WAVE_BG-BD-1
Reel 13" Q1/T1 CECCActive74HC244D74HC244D,653
( 9337 134 20653 )
74HC244PW
TSSOP20
(SOT360-1)
SOT360-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC24474HC244PW,118
( 9351 746 40118 )
74HCT244BQ
DHVQFN20
(SOT764-1)
SOT764-1Reel 7” Q1/T1 or Q2/T3ActiveHCT24474HCT244BQ,115
( 9352 737 29115 )
74HCT244D
SO20
(SOT163-1)
SOT163-1WAVE_BG-BD-1
Reel 13" Q1/T1 CECCActive74HCT244D74HCT244D,653
( 9337 134 30653 )
74HCT244PW
TSSOP20
(SOT360-1)
SOT360-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHCT24474HCT244PW,118
( 9351 652 20118 )

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC244D
SO20
(SOT163-1)
SOT163-1WAVE_BG-BD-1
Bulk Pack, CECCDiscontinued / End-of-life74HC244D74HC244D,652
( 9337 134 20652 )
74HC244PW
TSSOP20
(SOT360-1)
SOT360-1SSOP-TSSOP-VSO-WAVE
Bulk PackDiscontinued / End-of-lifeHC24474HC244PW,112
( 9351 746 40112 )
74HCT244D
SO20
(SOT163-1)
SOT163-1WAVE_BG-BD-1
Bulk Pack, CECCDiscontinued / End-of-life74HCT244D74HCT244D,652
( 9337 134 30652 )
74HCT244PW
TSSOP20
(SOT360-1)
SOT360-1SSOP-TSSOP-VSO-WAVE
Bulk PackDiscontinued / End-of-lifeHCT24474HCT244PW,112
( 9351 652 20112 )

Discontinuation information

Type numberOrderable part number, (Ordering code (12NC))Last time buy dateLast time delivery dateReplacement productStatusComments
74HC244D933713420652
74HC244PW935174640112
74HCT244D933713430652
74HCT244PW935165220112

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC244BQ74HC244BQ,11574HC244BQAlways Pb-free29.90.91.11E911
74HC244D74HC244D,65374HC244Dweek 13, 200529.90.91.11E911
74HC244PW74HC244PW,11874HC244PWweek 7, 200529.90.91.11E911
74HCT244BQ74HCT244BQ,11574HCT244BQAlways Pb-free29.90.91.11E911
74HCT244D74HCT244D,65374HCT244Dweek 30, 200429.90.91.11E911
74HCT244PW74HCT244PW,11874HCT244PWweek 17, 200529.90.91.11E911

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC244D74HC244D,65274HC244Dweek 13, 200529.90.91.11E911
74HC244PW74HC244PW,11274HC244PWweek 7, 200529.90.91.11E911
74HCT244D74HCT244D,65274HCT244Dweek 30, 200429.90.91.11E911
74HCT244PW74HCT244PW,11274HCT244PWweek 17, 200529.90.91.11E911
Quality and reliability disclaimer

Documentation (10)

File nameTitleTypeDate
74HC_HCT244Octal buffer/line driver; 3-stateData sheet2021-07-28
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
D12_PC_sch_ver2_0-Design support1998-04-22
hchc Spice modelSPICE model2013-05-06
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
SOT764-1plastic, leadless dual in-line compatible thermal enhanced very thin quad flat package; 20 terminals; 0.5 mm pitch; 4.5 mm x 2.5 mm x 1 mm bodyPackage information2021-08-17
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT360-1plastic, thin shrink small outline package; 20 leads; 0.65 mm pitch; 6.5 mm x 4.4 mm x 1.1 mm bodyPackage information2020-04-21
SOT163-1plastic, small outline package; 20 leads; 1.27 mm pitch; 12.8 mm x 7.5 mm x 2.65 mm bodyPackage information2020-04-21
WAVE_BG-BD-1Wave soldering profileWave soldering2021-09-08

Support

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Models

File nameTitleTypeDate
hchc Spice modelSPICE model2013-05-06

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