74HC42

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 V_CC.

Features and benefits

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

Applications

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

Parametrics

Type number	Product status	V_CC (V)	Logic switching levels	Output drive capability (mA)	t_pd (ns)	Power dissipation considerations	T_amb (°C)	R_th(j-a) (K/W)	Ψ_th(j-top) (K/W)	R_th(j-c) (K/W)	Package name
74HC42D	Production	2.0 - 6.0	CMOS	± 5.2	17	low	-40~125	73	1.1	31	SO16

Package

Type number	Package	Package information	Reflow-/Wave soldering	Packing	Status	Marking	Orderable part number, (Ordering code (12NC))
74HC42D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1 CECC	Active	74HC42D	74HC42D,653 ( 9337 148 60653 )

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

Type number	Package	Package information	Reflow-/Wave soldering	Packing	Status	Marking	Orderable part number, (Ordering code (12NC))
74HC42D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	Bulk Pack, CECC	Discontinued / End-of-life	74HC42D	74HC42D,652 ( 9337 148 60652 )

Discontinuation information

Type number	Orderable part number, (Ordering code (12NC))	Last time buy date	Last time delivery date	Replacement product	Status	Comments
74HC42D	933714860652	2021-12-31	2022-06-30	74HC42D

Quality, reliability & chemical content

Type number	Orderable part number	Chemical content	RoHS / RHF	Leadfree conversion date	EFR	IFR	MTBF (hour)	MSL	MSL leadfree
74HC42D	74HC42D,653	74HC42D		week 6, 2004	39.3	1.3	7.69E8	1	1

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

Type number	Orderable part number	Chemical content	RoHS / RHF	Leadfree conversion date	EFR	IFR	MTBF (hour)	MSL	MSL leadfree
74HC42D	74HC42D,652	74HC42D		week 6, 2004	39.3	1.3	7.69E8	1	1

Quality and reliability disclaimer

Documentation (7)

File name	Title	Type	Date
74HC42	BCD to decimal decoder (1-of-10)	Data sheet	2017-03-17
AN11044	Pin FMEA 74HC/74HCT family	Application note	2019-01-09
HCT_USER_GUIDE	HC/T User Guide	User manual	1997-10-31
SO-SOJ-WAVE	Footprint for wave soldering	Wave soldering	2009-10-08
SO-SOJ-REFLOW	Footprint for reflow soldering	Reflow soldering	2009-10-08
SOT109-1	plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm body	Package information	2021-01-06
WAVE_BG-BD-1	Wave soldering profile	Wave soldering	2021-09-08

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Ordering, pricing & availability

74HC42D

Sample

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