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Texas Instruments SN74ALS20AD — Analog & Data Acquisition
Texas Instruments

SN74ALS20AD NAND Gate, 12.5 ns, 14-SOIC

MPNSN74ALS20AD
End of Life

Texas Instruments 74ALS series SN74ALS20AD, dual 4-input NAND gate, 14-SOIC surface mount, 4.5V-5.5V supply, 12.5 ns propagation delay @ 5V/50pF, 0°C to 70°C operating temperature.

$1.51Ref. price · indicative, final on quote
SN74ALS20AD datasheet
Packaging14-SOIC (0.154", 3.90mm Width)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
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Specifications

SN74ALS20AD Technical Specifications
ParameterValue
Series74ALS
Logic typeNAND Gate
Mounting typeSurface Mount
Voltage4.5V ~ 5.5V
Current - output high, low400µA, 8mA
Number of inputs4
Operating temperature0°C ~ 70°C
PackageTube
Case14-SOIC (0.154\", 3.90mm Width)
Number of circuits2
Input logic level - low0.8V
Input logic level - high2V
Max propagation delay @ v, max CL12.5ns @ 5V, 50pF

Product details

What this 74ALS NAND gate is for

The SN74ALS20AD is a dual 4-input NAND gate from the 74ALS family, packaged in a 14-SOIC. It takes two independent 4-input NAND gates, each with a single output, and runs on a 4.5 V to 5.5 V supply.

Package and mounting

The 12.5 ns propagation delay at 5 V with a 50 pF load is the headline number. The output drive is 400 µA sourcing and 8 mA sinking. Input thresholds are standard TTL: a low below 0.8 V, a high above 2 V. The operating temperature range is 0°C to 70°C.

Package and footprint

The 14-SOIC body is 3.90 mm wide — the narrow SOIC footprint that matches the standard 14-pin SOIC land pattern. It's a surface-mount part, so no through-hole adapter board needed for new designs; for repair work, you'll be hot-air soldering or using a fine-tip iron on the existing pads.

Sourcing and lifecycle

ROHS3 compliant, which covers the EU RoHS exemption list. For a production BOM, this part doesn't carry an LTB risk today.

Frequently asked questions

What is the propagation delay of SN74ALS20AD?

The maximum propagation delay is 12.5 ns at 5 V supply with a 50 pF load. That's the spec you use for timing closure on a 5 V TTL bus.

What are the equivalents or replacements for SN74ALS20AD?

A direct functional equivalent is the SN74ALS11ANS, which is a triple 3-input AND gate from the same 74ALS series — same supply voltage range and similar propagation delay, but different logic function and pinout. For a NAND gate replacement, the SN74F00DR (quad 2-input NAND, 5 ns delay) is faster but from the 74F family; verify the input thresholds and output drive match your design. No single drop-in replacement exists — check your logic diagram before swapping.

What is the difference between SN74ALS20AD and SN74LS20AD?

The SN74ALS20AD is the Advanced Low-Power Schottky version; it typically offers lower propagation delay and lower power consumption per gate compared to the standard LS (Low-Power Schottky) version. The ALS variant is a direct pin-compatible upgrade for most 5 V TTL sockets, but verify the output drive and input thresholds against your specific load.