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Texas Instruments SN74ALS08DR — Logic ICs

SN74ALS08DR 74ALS Quad 2-Input AND Gate, 14ns @ 5V

MPNSN74ALS08DR
End of Life

Texas Instruments 74ALS series, SN74ALS08DR, AND Gate, 4 Circuits, 2 Inputs, 400µA / 8mA output, 14ns @ 5V/50pF, 4.5V–5.5V supply, 0°C–70°C, 14-SOIC.

$0.88Ref. price · indicative, final on quote
Texas Instruments SN74ALS08DR datasheet (PDF)
Packaging14-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Series74ALS
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74ALS08DR specifications
ParameterValue
Series74ALS
Logic typeAND Gate
MountingSurface Mount
Supply voltage4.5V ~ 5.5V
Current - output high, low400µA, 8mA
I/O channels2
Operating temperature0°C ~ 70°C
PackageTape & Reel (TR); Cut Tape (CT)
Case14-SOIC (0.154\", 3.90mm Width)
Number of circuits4
Input logic level - low0.8V
Input logic level - high2V
Max propagation delay @ v, max CL14ns @ 5V, 50pF

Product details

Quad 2-input AND gate — the glue-logic workhorse

The SN74ALS08DR: Each gate takes two inputs and outputs the logical AND, making it the basic building block for combinatorial logic, address decoding, enable gating, and control-path cleanup on 5 V digital boards.

The maximum propagation delay is 14 ns with a 50 pF load at 5 V.

Output drive — 8 mA sink, 400 µA source

The output can sink 8 mA and source only 400 µA.

Input thresholds — 0.8 V low, 2 V high

The low-level input threshold is 0.8 V maximum; the high-level threshold is 2 V minimum.

Frequently asked questions

Is SN74ALS08DR a direct replacement for SN74LS08?

Yes, in most cases. The SN74ALS08DR is pin-compatible with the older SN74LS08 and runs on the same 5 V supply. The ALS version is faster (14 ns vs about 18 ns for LS) and draws slightly more supply current. If the original board was designed with LS08 timing margins, the ALS08 will work as a drop-in replacement and may even improve setup timing. The only catch is the higher input current of ALS versus LS — check that the driving gate can source the additional 20 µA per input; in practice it rarely matters.

What are the alternatives to SN74ALS08DR?

The closest functional alternative in the same 74ALS family is the SN74ALS11ANS, which is a triple 3-input AND gate in a different package (14-SOIC but tube instead of tape-and-reel). It has three gates instead of four, and each gate has three inputs instead of two. For a direct quad 2-input replacement, the SN74F00DR is a NAND gate (not AND) from the faster 74F family with 5 ns propagation delay, but the logic function is inverted. If you need the exact AND function, stick with the SN74ALS08DR or cross to the 74ACT08 which offers similar speed with CMOS-level inputs.