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Texas Instruments CD74HCT243E — Logic ICs
Texas Instruments

CD74HCT243E 74HCT 4-bit Transceiver, 14-DIP, -55°C to 125°C

MPNCD74HCT243E
End of Life

Texas Instruments 74HCT series CD74HCT243E, 4-bit non-inverting transceiver with 3-state outputs, 4.5V to 5.5V supply, 14-DIP through-hole package, -55°C to 125°C operating temperature.

$1.38Ref. price · indicative, final on quote
CD74HCT243E datasheet
Packaging14-DIP (0.300", 7.62mm)
StockContact for availability
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Specifications

CD74HCT243E Technical Specifications
ParameterValue
Series74HCT
Logic typeTransceiver, Non-Inverting
Output type3-State
Mounting typeThrough Hole
Voltage4.5V ~ 5.5V
Current - output high, low6mA, 6mA
Operating temperature-55°C ~ 125°C (TA)
PackageTube
Case14-DIP (0.300\", 7.62mm)
Number of elements1
Number of bits per element4

Product details

The Texas Instruments CD74HCT243E is a 74HCT-series 4-bit non-inverting transceiver with 3-state outputs, packaged in a 14-pin DIP (0.300" body) for through-hole mounting. This part is designed for bidirectional data flow on a 4-bit bus, with separate output-enable controls that let you isolate the bus segments or drive them independently. Typical applications include legacy industrial control backplanes, prototyping boards, and any 5V logic system where a socketed DIP transceiver is preferred over a surface-mount package.

Military temperature range — avionics and downhole use

The 6 mA output drive at both high and low states is modest by modern standards, but within the 5V HCT family it is sufficient for driving a single TTL load or a short PCB trace on a backplane.

Through-hole DIP — socket-friendly for prototypes and legacy retrofits

The 14-pin DIP (0.300" wide, 7.62 mm pitch) is the classic through-hole footprint that fits standard IC sockets or can be soldered directly into plated-through holes. For a rework lab or a prototype bench, this package is far easier to swap than a surface-mount SOIC. The tube shipping medium is typical for DIP parts and protects the leads during handling.

Frequently asked questions

Can I use CD74HCT243E as a replacement for 74HCT245?

Not directly — the CD74HCT243E is a 4-bit transceiver, while the 74HCT245 is an 8-bit transceiver. The pinouts differ, and the 74HCT243E uses a different control scheme. For a 4-bit bus segment the CD74HCT243E fits; for an 8-bit replacement you would need two devices or a different part.

What is the difference between CD74HCT243E and CD74HC243E?

The CD74HCT243E is the HCT (High-Speed CMOS, TTL-compatible) variant, while the CD74HC243E is the HC (High-Speed CMOS, CMOS-compatible) version. The HCT version has TTL-level input thresholds, making it a direct drop-in for 5V TTL logic systems without extra level shifting. The HC version uses CMOS thresholds and may not switch correctly with TTL input levels.