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Texas Instruments SN74AHCT139PW — Logic ICs

SN74AHCT139PW Decoder/Demultiplexer, 1x2:4, 16-TSSOP

MPNSN74AHCT139PW
End of Life

Texas Instruments 74AHCT series decoder/demultiplexer, SN74AHCT139PW, 1 x 2:4 circuit, 2 independent circuits, 4.5V to 5.5V supply, 8mA output drive, -40°C to 85°C, 16-TSSOP package, surface mount.

$1.29Ref. price · indicative, final on quote
Packaging16-TSSOP (0.173", 4.40mm Width)
RoHSROHS3 Compliant
Series74AHCT
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74AHCT139PW specifications
ParameterValue
TypeDecoder/Demultiplexer
Series74AHCT
MountingSurface Mount
Supply voltage4.5V ~ 5.5V
Voltage supply sourceSingle Supply
Current - output high, low8mA, 8mA
Operating temperature-40°C ~ 85°C
Circuit1 x 2:4
PackageTube
Case16-TSSOP (0.173\", 4.40mm Width)
Independent circuits2

Product details

Dual 1-of-4 decoder/demultiplexer for 5V address decoding and signal routing

Each of the two independent circuits decodes a 2-bit address input into one of four active-low outputs, with an active-low enable per decoder.

Industrial temperature range and 8mA drive for real-world bus loads

The 8mA symmetric drive also means the rise and fall times stay balanced, which simplifies timing closure on a multiplexed address or data bus.

16-TSSOP footprint and surface-mount assembly

The 16-TSSOP package (4.40mm body width, 0.65mm pin pitch) is a common logic footprint that shares land patterns with many other 16-pin TSSOP logic devices.

Active lifecycle — no near-term end-of-life concern for production BOMs

Frequently asked questions

Can SN74AHCT139PW be used as a demultiplexer?

Yes. The part is specified as a decoder/demultiplexer. With the enable pin acting as a data input and the address lines selecting the output channel, it functions as a 1-of-4 demultiplexer. Each of the two independent circuits can route a signal to one of four outputs.

What is the difference between SN74AHCT139PW and SN74HC139PW?

The key difference is the logic family. SN74AHCT139PW is from the 74AHCT series, which is pin-compatible with 74HC but uses TTL-compatible input thresholds. This means the AHCT variant can be driven directly by 5V TTL logic outputs without needing a pull-up, whereas the 74HC version uses CMOS thresholds.