Product Overview
Motorola MC68705R3P 8-Bit EPROM Microcontroller in a 40-Pin Plastic DIP
Condition
Used, clean, and in very good condition, pulled from decommissioned equipment. The top of the black plastic body carries the Motorola M logo, the part number MC68705R3P, and a second factory line reading 06A46EQECE8902. Counted in the photos there are 20 leads per side, 40 in all, and every one is present, straight, and bright, with no bent or shortened pins, no solder residue, and no oxidation visible. The underside shows two circular molded stamps, the one at the right reading 46. There is no quartz erase window on this package. Against the ruler the body measures approximately two inches end to end, the usual 40-pin DIP footprint. Photographed on pink anti-static foam. No functional or programming test result is recorded for this piece, so the photographs and the factory markings are the spec. Stock of one.
Same or next business day shipping 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
The MC68705R3P is Motorola's EPROM-program-memory member of the M6805 8-bit microcontroller family, packaged here in a 40-pin plastic dual in-line package. It puts an 8-bit CPU core, on-chip EPROM program memory, 112 bytes of on-chip RAM, an on-chip timer, bidirectional digital I/O port pins, and maskable interrupt handling on a single piece of silicon, which is why parts like this one ended up buried in appliance controllers, machine sequencers, and instrument front panels through the 1980s and well past. The plastic package has no quartz window, so the on-chip EPROM in this variant is one-time programmable rather than UV erasable. This particular chip was pulled from decommissioned equipment, and the marking on top is exactly as photographed: MC68705R3P over 06A46EQECE8902. Also searched as MC68705R3 and 68705R3P. EPROM size, supply voltage range, and the full pin assignment are not confirmed here - verify against the Motorola datasheet before use.
Key Features
- Part number: MC68705R3P, Motorola M6805 8-bit microcontroller family
- Package: 40-pin plastic dual in-line, 20 leads per side, no erase window
- Size: approximately two inches end to end against the ruler in the photos
- Program memory: on-chip EPROM, one-time programmable in this windowless package
- RAM: 112 bytes on-chip
- Timer: on-chip timer for timing and control tasks
- I/O: configurable digital port pins, including bidirectional pins
- Interrupts: maskable interrupt support for real-time event handling
- Top marking: Motorola M logo, MC68705R3P, factory line 06A46EQECE8902
- Condition: Used, clean, very good, pulled from decommissioned equipment
- Quantity available: one piece
- EPROM size, supply voltage, and pinout: not confirmed - verify against the datasheet before use
Applications
- Maintenance technician stocking a spare for a 1980s control board that still expects a 40-pin 6805-family MCU in this exact footprint
- Restorer working on vintage instrumentation, arcade, or appliance boards where matching the original Motorola part down to the package matters
- Bench engineer who needs a mechanically correct 40-pin DIP for socket fit checks, pinout tracing, or fixture and jig work
- Collector or instructor building a shelf of Motorola 6805-era silicon with original factory markings intact
Frequently Asked Questions
Is this chip blank, or does it still hold the previous owner's program?
Not confirmed. It came out of decommissioned equipment, so assume the on-chip EPROM may still carry whatever code the original board ran. Nothing here has been read out, verified, or erased. Read it in your programmer before you plan a design around it.
Can I erase it and burn my own code?
This is the plastic package, and the photos show no quartz window, so it cannot be UV erased the way a windowed ceramic 68705 can. Whether any unused program space remains is not confirmed - check it in a programmer that supports the 68705 family.
How many pins does it have, and how big is it?
Twenty leads per side, 40 total, counted in the top-down and underside photos. Against the ruler in the second photo the black body runs approximately two inches end to end, the standard 40-pin DIP outline. Measure your socket or board footprint before ordering if clearance is tight.
What is that second line of text on the top of the chip?
It reads 06A46EQECE8902. That is Motorola's factory lot and trace line, and we do not decode it or guarantee any meaning drawn from it. The part number that identifies the device is MC68705R3P on the line above it, next to the Motorola M logo.
It is sold as a used pull with no test result, so what am I actually getting?
You are getting this one photographed chip: a Motorola MC68705R3P in a 40-pin plastic DIP, pulled from decommissioned equipment, clean, with all 40 leads straight and bright and the markings legible. What you are taking on is the electrical side, because we do not list a functional or programming test for it, and the on-chip EPROM may already be written. The photographs and the factory marking are the spec, and the no-hassle satisfaction guarantee is there if the part that arrives is not the part you see. Shipping is $8 flat rate and free once your order passes $28, so a chip like this rides along with the rest of your basket, and orders leave the Idaho warehouse the same or next business day.
Somewhere under that windowless black plastic sits a program someone burned exactly once and never got to take back. Buy it for the Motorola lineage, the 40-pin footprint, and a top marking that still reads clean - what it remembers is your puzzle to open.
