CD74HCT244EG4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The CD74HCT244EG4 is an octal non-inverting buffer and line driver from Texas Instruments in a 20-pin DIP package, compatible with TTL and CMOS logic levels up to 5.5 V. It features 3-state outputs and two active-low output-enable pins for flexible bus driving in TTL-to-CMOS interface circuits. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- CD74HCT244EG4 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CD74HCT244EG4?
- Octal non-inverting buffer with 3-state outputs and dual active-low OE pins enables flexible 8-bit bus driving and isolation in TTL/CMOS designs
- HCT logic family provides direct TTL-level input compatibility (VIH = 2 V) on a 5 V CMOS supply, simplifying mixed-logic board interfaces
- 20-pin DIP package with 5.5 V maximum supply is widely supported by breadboard prototyping, through-hole assembly, and legacy board replacement
What is CD74HCT244EG4 used for?
The CD74HCT244EG4 is used as a bus driver and signal buffer in microcontroller and microprocessor systems where TTL-compatible input signals from 5 V logic must drive multiple CMOS loads without signal degradation. Its 3-state outputs allow multiple buffers to share a common 8-bit data bus under separate output-enable control, making it a standard component in address latches, memory interface boards, and data bus isolation circuits. The through-hole 20-DIP package also makes it a practical choice for prototyping platforms and industrial control systems requiring long-term part availability.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the CD74HCT244EG4 datasheet?
CD74HCT244EG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HCT244EG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the HCT logic family of the CD74HCT244EG4 differ from standard HC buffers in a 5 V mixed-logic system?
The HCT variant uses TTL-compatible input thresholds (VIH minimum 2 V, VIL maximum 0.8 V) rather than the CMOS-standard 50% VCC thresholds of the HC family. This lets the CD74HCT244EG4 accept outputs from TTL devices or 5 V microcontrollers with TTL-level drive on its inputs while still switching its CMOS outputs rail-to-rail on a 5.5 V supply, eliminating level-shift circuitry in mixed TTL/CMOS 5 V designs.
How are the two output-enable pins on the CD74HCT244EG4 used to build a bidirectional bus interface?
The CD74HCT244EG4 has two independent active-low output-enable inputs (OE1 and OE2), each controlling 4 of the 8 buffer outputs. By driving OE1 and OE2 with complementary control signals, a designer can enable one half of the 8-bit bus while disabling the other, creating gated bus segments. This is commonly used in 8-bit data bus arbitration, address demultiplexing, and memory interface circuits operating at TTL logic levels.
Is the CD74HCT244EG4 in a 20-pin DIP package suitable for breadboard prototyping and legacy board repair?
Yes. The 20-pin DIP (0.100 inch / 2.54 mm pitch) through-hole package fits directly into standard solderless breadboards and DIP IC sockets, making it ideal for rapid prototyping and for replacing worn or failed buffer ICs on older industrial control boards. Texas Instruments' G4 green suffix also confirms RoHS compliance, so it meets current environmental requirements while remaining backward-compatible with legacy through-hole PCB designs.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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