Product Overview
High-Speed 8051-Compatible Microcontroller in a Through-Hole 40-Pin DIP
Condition
Used pull, one piece in stock, and the piece in the photograph is the piece you receive. The black plastic 40-pin DIP body carries four lines of gold-toned marking: DS80C320 on the first line, MCG on the second, then 0743C7 and 183AB. Both rows of leads are straight, in plane, and bright tin with no solder residue, no tinning shadows, and no bent or clipped pins - the normal look of a device removed from a socket rather than desoldered from a board. Two round tooling depressions and the pin-1 dot are clearly visible on the top face. Shown on pink antistatic foam on the photo bench. Untested by us: no power-up, no programming, no functional check.
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Product Overview
The DS80C320 is the high-speed, low-power 8051-compatible microcontroller family originally developed by Dallas Semiconductor and carried forward under Maxim. It keeps the 8051 instruction set and the familiar 40-pin dual-in-line footprint that legacy boards are laid out for, which is exactly why it still turns up in repair and retrofit work rather than in new designs. This particular device is the -MCG suffix in plastic DIP, marked DS80C320 / MCG on the package top with the trailing codes 0743C7 and 183AB. Clock rate, on-chip memory, serial port count, and timer configuration are not confirmed by us and are not printed on the part - check the Maxim DS80C320 datasheet for the -MCG grade before you commit it to a design or a socket. Sold as a single piece.
Key Features
- Part number as marked: DS80C320 MCG
- Additional package markings: 0743C7 and 183AB
- Brand: Maxim (Dallas Semiconductor 8051-compatible line)
- Package: 40-pin plastic dual-in-line, through-hole
- Leads: straight, bright, no solder on any pin
- Family: high-speed, low-power 8051-compatible microcontroller
- Condition: used pull, untested
- Quantity available: one piece
- Electrical specifications: not confirmed - verify against the Maxim DS80C320 datasheet before use
Applications
- A service technician repairing an industrial controller whose original 8051-family device has failed, and who needs the same 40-pin DIP outline back in the same socket
- A firmware engineer keeping a legacy 8051 codebase alive on original hardware instead of porting it to a modern part
- An electronics hobbyist restoring 1990s and 2000s embedded gear that expects a socketed DIP microcontroller
- A lab or prototyping bench stocking one spare 8051-compatible DIP for a breadboard or a wire-wrap build
Frequently Asked Questions
Has this microcontroller been powered up or programmed?
No. It is sold untested. We did not apply power, read the part, or attempt to program it, and we make no claim about the internal state of the device. Treat it as an unverified part and test it in your own fixture before it goes into anything that matters.
The pins look clean for a used part - was it really pulled?
Yes. Bright, solder-free pins are what a socket-pulled device looks like. Plenty of 1990s and 2000s equipment socketed its microcontroller precisely so it could be swapped, and a part lifted out of a socket never sees a soldering iron. It is described as a pull because that is its history, not because of anything visible on the leads.
What do 0743C7 and 183AB mean?
They are factory package markings beneath the part number, of the kind used for lot and date tracking. We report them exactly as printed so you can match this device to whatever your documentation or your existing stock calls for, but we do not interpret them into a manufacturing date and we do not guarantee any particular decode.
Can I confirm the clock speed and memory before I buy?
Not from this listing. The package does not print a speed grade or memory size, and we do not assert specifications that are not on the part or in our records. The Maxim DS80C320 datasheet covers the -MCG grade in full, and that is the document to work from.
What am I actually getting for an untested pull, and what risk am I taking on?
You are getting exactly one DS80C320-MCG in 40-pin plastic DIP, the physical piece in the photograph, with the markings and lead condition you can see there. What you are taking on is the electrical unknown: we have not powered it, programmed it, or verified a single specification, so the photo is the spec and the datasheet is the reference. That is the trade an untested pull offers - a specific, individually photographed part with an honest description instead of a nameless chip out of a mixed bag. Shipping is a flat $8, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Dallas took a microcontroller everybody already knew and taught it to move, then left it in the same 40-pin outline so the old boards never noticed the difference. If something on your bench still speaks 8051, this one is waiting for a socket.
