Product Overview
Mitsubishi 74LS139 Dual 2-to-4 Decoder / Demultiplexer Logic IC
Condition
Used. Equipment pull. Markings legible: 74LS 139 with Mitsubishi three-diamond logo and 5T8 code. Evaluation: Visual inspection only. Function testing not performed.
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Product Overview
The Mitsubishi 74LS139 (M74LS139P) is a dual 2-line to 4-line decoder/demultiplexer integrated circuit fabricated in Low-Power Schottky TTL logic. Packaged in a standard 16-pin dual in-line package (DIP-16), it contains two individual, independent decoders, each featuring two address inputs, an active-LOW enable input, and four active-LOW mutually exclusive outputs.
Key Features
- Dual independent 2-line to 4-line decoding and demultiplexing circuits
- Low-Power Schottky (74LS) TTL technology
- Active-LOW enable input for memory address decoding and data routing
- Active-LOW outputs for direct driving of enable lines and logic gates
- Standard 16-pin plastic dual in-line package (DIP-16)
- Nominal 5.0V DC operating supply voltage (4.75V to 5.25V range)
Applications
- Replacing failed address decoders in legacy 8-bit computers, arcade mainboards, and industrial control cards
- Routing chip-select signals across multi-chip memory banks and peripheral interfaces
- Building discrete logic breadboard projects, hobbyist microcomputers, and digital trainer circuits
Frequently Asked Questions
What is the pin count and package type of this IC?
This unit is housed in a standard 16-pin plastic DIP (Dual In-Line Package) with 0.1-inch lead spacing, suitable for breadboards, sockets, or through-hole soldering.
What logic state activates the outputs on the 74LS139?
The outputs are active-LOW. When the enable pin is held LOW, the selected output goes LOW while the remaining three outputs stay HIGH.
Why buy this specific pulled IC rather than taking a chance on an unverified bulk lot?
You receive the exact Mitsubishi logic IC shown with verified legible markings, avoiding the lead times and counterfeit risks common with mystery surplus multipacks. Shipping is $8 flat rate, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Solid Low-Power Schottky logic built to drop straight into a socket and solve your address decoding needs without fuss.
