74HC42D

BCD to decimal decoder (1-of-10)

The 74HC42 is a one of ten BCD to decimal decoder. It accepts four BCD inputs (0A to 3A) and provides ten mutually exclusive outputs (0Y to 9Y). The logic design ensures that all outputs are HIGH when binary codes greater than nine are applied to the inputs. The most significant input (3A) produces an useful inhibit function when the device is used as a 1-of-8 decoder. The 3A input can also be used as the data input in an 8-output demultiplexer application. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74HC42D 74HC42D,653 933714860653 SOT109-1 Order product
74HC42D 74HC42D,652 933714860652 SOT109-1 Order product

Features

  • Complies with JEDEC standard no. 7A
  • Input levels:
    • For 74HC42: CMOS level
  • Mutually exclusive outputs
  • 1-of-8 demultiplexing capability
  • Outputs disabled for input codes above nine
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Specified from -40 °C to +85 °C and -40 °C to +125 °C

Target applications

  • Driving LED displays
  • Driving incandescent displays
  • Driving fluorescent displays
  • Driving LCD displays
  • Driving gas discharge displays

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
74HC42DProduction2.0 - 6.0CMOS± 5.217low-40~125731.131SO16

Package

Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackageOutline versionReflow-/Wave solderingPacking
74HC42D74HC42D,653
( 9337 148 60653 )
Active74HC42D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECC
74HC42D,652
( 9337 148 60652 )
Active74HC42DBulk Pack, CECC

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
74HC42D74HC42D,65374HC42D84.96.621.51E811
74HC42D74HC42D,65274HC42D84.96.621.51E811
Quality and reliability disclaimer

Documentation (6)

File nameTitleTypeDate
74HC42BCD to decimal decoder (1-of-10)Data sheet2017-03-17
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
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

Support

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Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74HC42D74HC42D,653933714860653Reel 13" Q1/T1 CECCOrder product
74HC42D74HC42D,652933714860652Bulk Pack, CECCOrder product

Sample

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