Product Overview
Fairchild 74LS42PC 4-Line BCD to 10-Line Decimal Decoder DIP-16
Condition
Used equipment pull. Package markings stamped: 74LS42 PC with Fairchild logo, date code 8631, SINGAPORE. Evaluation: Visual inspection only. Function testing not performed.
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Product Overview
The Fairchild 74LS42PC is a Low-Power Schottky TTL integrated circuit designed for 4-line BCD to 10-line decimal decoding and 1-of-8 demultiplexing. Featuring four binary-coded inputs and ten mutually exclusive active-low outputs, it decodes standard 8-4-2-1 BCD codes for display driving, memory addressing, and digital control circuits.
Key Features
- Low-power Schottky (74LS) TTL technology
- 4 BCD input lines to 10 active-low decimal outputs
- Operates on standard 5.0 V logic supply (4.75 V to 5.25 V operating range)
- Standard 16-pin dual in-line package (DIP-16) for through-hole mounting
- Can function as a 1-of-8 demultiplexer using the D input as an active-low enable line
Applications
- Restoring logic boards, industrial controllers, and vintage computing hardware
- Breadboarding decimal decoding and indicator drive stages in custom electronics
- Routing control lines and address decoding in discrete logic projects
Frequently Asked Questions
Can this chip be used as a 3-line to 8-line decoder?
Yes. Utilizing inputs A, B, and C as address lines while driving input D as an active-low strobe configures the 74LS42 as a 1-of-8 line demultiplexer.
Why buy a single pulled unit instead of a bulk lot?
Purchasing an individual vintage component supplies the specific replacement part needed for a repair without accumulating excess inventory. Flat rate shipping is $8, or free on orders over $28, shipped same or next business day from our Idaho warehouse.
Vintage TTL logic has a straightforward honesty - when a classic build needs a decade decoded, the right 16-pin chip drops in and gets right to work.
Shipping? $8 flat rate, free once your order passes $28 - and it leaves the Idaho warehouse the same or next business day.
