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Texas Instruments CD74AC240E — Logic ICs
Texas Instruments

CD74AC240E 74AC Buffer, Inverting, 24mA, 20-DIP – Active

MPNCD74AC240E
End of Life

Texas Instruments 74AC series, Buffer, Inverting, 3-State output, 24mA / 24mA, 1.5V ~ 5.5V supply, -40°C ~ 85°C, Through Hole 20-DIP (0.300", 7.62mm), 20-PDIP.

$0.98Ref. price · indicative, final on quote
CD74AC240E datasheet
Packaging20-DIP (0.300", 7.62mm)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
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Specifications

CD74AC240E Technical Specifications
ParameterValue
Series74AC
Logic typeBuffer, Inverting
Output type3-State
Mounting typeThrough Hole
Voltage1.5V ~ 5.5V
Current - output high, low24mA, 24mA
Operating temperature-40°C ~ 85°C (TA)
PackageTube
Case20-DIP (0.300\", 7.62mm)
Number of elements2
Number of bits per element4

Product details

The CD74AC240E is a dual 4-bit inverting buffer with 3-state outputs from TI's 74AC family. It takes two independent 4-bit sections, each with its own output-enable control, and drives 24 mA per output on both the high and low side. The 20-pin DIP package (0.300" body) is through-hole, so it fits standard sockets and is straightforward to hand-rework.

For a through-hole 74AC buffer that has been around for years, this is a solid sourcing signal – no need to stockpile or scramble for a replacement.

Package and mounting

The 24 mA symmetric drive is typical for the 74AC family and enough to drive a handful of CMOS inputs, a small bus, or a low-current LED directly. The 3-state outputs let you share a data bus with other devices – just mind the output-enable timing if you are hot-swapping.

Frequently asked questions

What is the difference between CD74AC240E and CD74AC244E?

Both are 74AC buffers in 20-pin DIP, but the CD74AC240E is an inverting buffer while the CD74AC244E is non-inverting. The pinout differs on the output-enable and data pins, so they are not drop-in replacements – check the logic polarity against your bus design.