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Texas Instruments SN74LVC138APWT — Discrete Semiconductors

SN74LVC138APWT 3:8 Decoder/Demux, 1.65V-3.6V, 16-TSSOP

MPNSN74LVC138APWT
End of Life

Texas Instruments SN74LVC138APWT, 74LVC series, 1-of-8 Decoder/Demultiplexer, 1 x 3:8 circuit, 1.65V to 3.6V supply, 24mA output drive, -40°C to 85°C, 16-TSSOP package, Surface Mount, Active, ROHS3 Compliant.

$1.31Ref. price · indicative, final on quote
Texas Instruments SN74LVC138APWT datasheet (PDF)
Packaging16-TSSOP (0.173", 4.40mm Width)
RoHSROHS3 Compliant
Series74LVC
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74LVC138APWT specifications
ParameterValue
TypeDecoder/Demultiplexer
Series74LVC
MountingSurface Mount
Supply voltage1.65V ~ 3.6V
Voltage supply sourceSingle Supply
Current - output high, low24mA, 24mA
Operating temperature-40°C ~ 85°C
Circuit1 x 3:8
PackageTape & Reel (TR); Cut Tape (CT)
Case16-TSSOP (0.173\", 4.40mm Width)
Independent circuits1

Product details

What this 3:8 decoder does on the board

The SN74LVC138APWT is a single 1-of-8 decoder/demultiplexer from TI's 74LVC family. It takes a 3-bit binary address on its select inputs and asserts one of eight active-low outputs. The three enable inputs (two active-low, one active-high) give you a gating option for cascading or chip-select generation without extra glue logic. Each output can sink or source 24 mA, enough to drive an LED indicator, a small relay coil through a transistor, or the enable pin on a regulator without a buffer.

Housed in a 16-TSSOP (4.40 mm body width). Surface-mount only — no through-hole variant in this order code.

Frequently asked questions

Is SN74LVC138APWT compatible with 3.3V?

Yes, 3.3V is within the 1.65V to 3.6V supply range. The 24 mA output drive at 3.3V is sufficient for standard 3.3V CMOS inputs.

What is the closest functional equivalent to SN74LVC138APWT?

The SN74LS348N is a different device class — it is an 8:3 priority encoder in a through-hole package with a 0°C to 70°C range, not a direct pin-for-pin substitute. For a 3:8 decoder in 74LVC, stick with this order code or the 74LVC138A in other package options.