Skip to main content
Log in
Texas Instruments SN74HC42D — Interface & Transceivers

SN74HC42D Decoder 1x4:10, 16-SOIC, 2V-6V

MPNSN74HC42D
End of Life

Texas Instruments 74HC series BCD-to-decimal decoder, 1 x 4:10 circuit, 16-SOIC (0.154", 3.90mm Width) surface-mount package, 2V to 6V single-supply, -40°C to 85°C operating temperature.

$0.97Ref. price · indicative, final on quote
Texas Instruments SN74HC42D datasheet (PDF)
Packaging16-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Series74HC
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74HC42D specifications
ParameterValue
TypeDecoder
Series74HC
MountingSurface Mount
Supply voltage2V ~ 6V
Voltage supply sourceSingle Supply
Current - output high, low5.2mA, 5.2mA
Operating temperature-40°C ~ 85°C
Circuit1 x 4:10
PackageTube
Case16-SOIC (0.154\", 3.90mm Width)
Independent circuits1

Product details

16-SOIC footprint and board integration

The SN74HC42D: The 1 x 4:10 circuit maps a 4-bit BCD input to one of ten active-low outputs, a common pattern for driving seven-segment displays, relay matrices, or address decoding in 74HC-based logic systems.

Output drive and fan-out

Each output sources or sinks 5.2 mA — enough to drive a standard TTL input or a low-current LED directly, but not a relay coil or high-capacitance bus without a buffer.

RoHS3 compliant (2011/65/EU + 2015/863), with no exemptions that would restrict EU-market shipments.

Frequently asked questions

What is the SN74HC42D's function and how does it decode?

The SN74HC42D is a BCD-to-decimal decoder with a 1 x 4:10 circuit — it takes a 4-bit binary-coded decimal input and asserts one of ten active-low outputs corresponding to the decimal value 0 through 9. Inputs above 1001 (10-15) produce all outputs high, which is the standard behaviour for a 74HC42.