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Texas Instruments CD74HCT138E — DC-DC Power Modules

CD74HCT138E 74HCT Decoder/Demultiplexer, 1x3:8, -55°C~125°C

MPNCD74HCT138E
End of Life

Texas Instruments CD74HCT138E, 74HCT series Decoder/Demultiplexer, 1 x 3:8 circuit, 4.5V~5.5V supply, -55°C to 125°C, 16-DIP through-hole, 4mA output high/low.

$0.87Ref. price · indicative, final on quote
Texas Instruments CD74HCT138E datasheet (PDF)
Packaging16-DIP (0.300", 7.62mm)
RoHSROHS3 Compliant
Series74HCT
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

CD74HCT138E specifications
ParameterValue
TypeDecoder/Demultiplexer
Series74HCT
MountingThrough Hole
Supply voltage4.5V ~ 5.5V
Voltage supply sourceSingle Supply
Current - output high, low4mA, 4mA
Operating temperature-55°C ~ 125°C
Circuit1 x 3:8
PackageTube
Case16-DIP (0.300\", 7.62mm)
Independent circuits1

Product details

The CD74HCT138E is a 74HCT-series 3-to-8 line decoder/demultiplexer. It takes a 3-bit binary input and selects one of eight active-low outputs. The 16-pin DIP package (0.300" body) is a through-hole legacy footprint still common in repair depots, breadboard prototyping, and low-volume industrial controllers that avoid SMT rework.

This is a mature, stable line.

Package and handling note

Supplied in a 16-pin PDIP, shipped in tubes. Through-hole means no bake before reflow — just standard ESD handling. The 0.300" row spacing fits common prototype boards and sockets. No MSL rating applies to DIP packages; they are inherently moisture-resistant.

Frequently asked questions

Is CD74HCT138E equivalent to SN74HCT138N?

Both are 74HCT 3-to-8 decoders in 16-pin DIP with similar specs. The CD74HCT138E is a Texas Instruments part; the SN74HCT138N is also TI. Functionally interchangeable in most designs — verify the exact supply and timing margins for your bus.

What is the difference between CD74HCT138E and SN74HCT138N?

Both are functionally identical 3-to-8 decoders from TI in the same package. The difference is the ordering code suffix — CD74HCT138E vs SN74HCT138N — which may reflect different date codes or factory origins. No parametric difference in the datasheet.