Product Overview
Motorola MC74HCT138AN 1-of-8 Decoder / Demultiplexer IC DIP-16
Condition
Used. Equipment pull. Evaluation: Visual inspection only. Function testing not performed. Markings legible: Motorola logo, MC74HCT138AN, FFJE9314.
Ships same or next business day from our Idaho warehouse. Honest pricing, no nonsense.
Online since 1999. We are here for our customers, with a no-hassle satisfaction guarantee.
Product Overview
Motorola MC74HCT138AN is a high-speed CMOS 1-of-8 decoder and demultiplexer housed in a standard 16-pin dual in-line through-hole package (DIP-16). Designed with LSTTL-compatible inputs, it decodes three binary select inputs into one of eight mutually exclusive active-low outputs when enabled. It features three enable inputs (two active-low, one active-high) to simplify cascading and memory address decoding without external gating.
Key Features
- High-speed CMOS logic (74HCT series) with TTL-compatible input thresholds
- Decodes 3 binary inputs to 1 of 8 active-low outputs
- 3 enable inputs (2 active-low, 1 active-high) for straightforward expansion
- 4.5 V to 5.5 V operating voltage range
- Standard 16-pin DIP through-hole footprint
- Operating temperature range rated from -55°C to +125°C
Applications
- Address decoding and chip-select generation for retrocomputing projects and legacy 8-bit/16-bit microprocessor buses
- Industrial control board repairs and legacy logic circuit replacements
- Digital routing and demultiplexing for hobbyist electronics and breadboard prototyping
Frequently Asked Questions
What logic family and voltage does the MC74HCT138AN use?
The 74HCT family operates on a 4.5V to 5.5V supply voltage and features TTL-compatible logic input switching levels, allowing direct interfacing with legacy TTL logic circuits.
Are the output lines active-high or active-low?
All eight decoded output lines (Y0 through Y7) are active-low.
Why buy a single tested pull rather than an unverified bulk lot?
When you need one specific vintage Motorola decoder to finish a repair or restore an 8-bit system, buying a single identified piece saves you from storing excess surplus. We ship quickly from our Idaho warehouse with $8 flat-rate shipping, free on orders over $28, leaving the same or next business day.
Vintage Motorola logic still delivers the exact bus timing and pinout your classic hardware expects. Plug this decoder into your socket and bring that address line back to life.
