74HC259-Q100; 74HCT259-Q100

8-bit addressable latch

The 74HC259-Q100; 74HCT259-Q100 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 74HC259-Q100; 74HCT259-Q100 are high-speed 8-bit addressable latches designed for general-purpose storage applications in digital systems. They are multifunctional devices capable of storing single-line data in eight addressable latches and providing a 3-to-8 decoder and multiplexer function with active HIGH outputs (Q0 to Q7). They also incorporate an active LOW common reset (MR) for resetting all latches as well as an active LOW enable input (LE).

The 74HC259-Q100; 74HCT259-Q100 has four modes of operation:

  • Addressable latch mode, in this mode data on the data line (D) is written into the addressed latch. The addressed latch follows the data input with all non-addressed latches remaining in their previous states.
  • Memory mode, in this mode all latches remain in their previous states and are unaffected by the data or address inputs.
  • Demultiplexing mode (or 3-to-8 decoding), in this mode the addressed output follows the state of the data input (D) with all other outputs in the LOW state.
  • Reset mode, in this mode all outputs are LOW and unaffected by the address inputs (A0 to A2) and data input (D).

When operating the 74HC259-Q100; 74HCT259-Q100 as an address latch, changing more than one address bit could impose a transient wrong address. Therefore, this should only be done while in the Memory mode.

This product has been qualified to the Automotive Electronics Council (AEC) standard Q100 (Grade 1) and is suitable for use in automotive applications.


  • Automotive product qualification in accordance with AEC-Q100 (Grade 1)
    • Specified from -40 °C to +85 °C and from -40 °C to +125 °C
  • Combined demultiplexer and 8-bit latch
  • Serial-to-parallel capability
  • Output from each storage bit available
  • Random (addressable) data entry
  • Easily expandable
  • Common reset input
  • Useful as a 3-to-8 active HIGH decoder
  • Input levels:
    • For 74HC259-Q100: CMOS level
    • For 74HCT259-Q100: TTL level
  • ESD protection:
    • MIL-STD-883, method 3015 exceeds 2000 V
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V (C = 200 pF, R = 0 Ω)
  • Multiple package options

Target applications


Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)fmax (MHz)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74HC259BQ-Q100Production2.0 - 6.0CMOS± 5.2188low-40~1258910.857DHVQFN16
74HC259D-Q100Production2.0 - 6.0CMOS± 5.2188low-40~125887.747SO16
74HC259PW-Q100Production2.0 - 6.0CMOS± 5.2188low-40~1251213.650TSSOP16
74HCT259BQ-Q100Production4.5 - 5.5TTL± 4208low-40~1258910.857DHVQFN16
74HCT259D-Q100Production4.5 - 5.5TTL± 4208low-40~125887.747SO16
74HCT259PW-Q100Production4.5 - 5.5TTL± 4208low-40~1251213.650TSSOP16


Type numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
SOT763-1Reel 7" Q1/T1ActiveHC25974HC259BQ-Q100,115
( 9352 988 21115 )
Reel 13" Q1/T1Active74HC259D74HC259D-Q100,118
( 9352 988 22118 )
Reel 13" Q1/T1ActiveHC25974HC259PW-Q100,118
( 9352 988 23118 )
SOT763-1Reel 7" Q1/T1ActiveHCT25974HCT259BQ-Q100,11
( 9352 988 24115 )
Reel 13" Q1/T1Active74HCT259D74HCT259D-Q100,118
( 9352 988 25118 )
Reel 13" Q1/T1ActiveHCT25974HCT259PW-Q100,11
( 9352 988 26118 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRMSLMSL leadfree
74HC259BQ-Q10074HC259BQ-Q100,11574HC259BQ-Q100Always Pb-free84.911
74HC259D-Q10074HC259D-Q100,11874HC259D-Q100Always Pb-free84.911
74HC259PW-Q10074HC259PW-Q100,11874HC259PW-Q100Always Pb-free84.911
74HCT259BQ-Q10074HCT259BQ-Q100,1174HCT259BQ-Q100Always Pb-free84.911
74HCT259D-Q10074HCT259D-Q100,11874HCT259D-Q100Always Pb-free84.911
74HCT259PW-Q10074HCT259PW-Q100,1174HCT259PW-Q100Always Pb-free84.911
Quality and reliability disclaimer

Documentation (16)

File nameTitleTypeDate
74HC_HCT259_Q1008-bit addressable latchData sheet2017-05-03
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
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
SOT763-1_115DHVQFN16; Reel pack, SMD, 7" Q1/T1 product orientationPacking2020-02-13
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
SOT109-1plastic, 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
SOT109-1_118SO16; Reel pack for SMD, 13"; Q1/T1 product orientationPacking2020-02-14
SOT403-1_118TSSOP16; Reel pack for SMD, 13"; Q1/T1 product orientationPacking2020-02-14
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_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


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