Temic TSC80C31-12CA CMOS 0 to 12 MHz Single-Chip 8-Bit Microcontroller

Temic TSC80C31-12CA CMOS 8-Bit Microcontroller - Used, 0 to 12 MHz, DIP-40

Condition

This TSC80C31-12CA is a single used chip pulled from decommissioned equipment. Both photos show the same top marked face of the 40-pin DIP package, differing only in zoom and framing - printing is clean and legible, and both pin rows are present and evenly spaced as seen from above. Both frames are straight-on overhead views, so the leads' downward length and tips are not shown; judge pin condition from what the photos actually cover. This chip has not been tested; function is unconfirmed.

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Product Overview

The TSC80C31-12CA is Temic Semiconductor's second-source build of the classic Intel-designed 8031 architecture, a CMOS single-chip 8-bit microcontroller in the MCS-51 family. The "31" designation means this is a ROMless part that runs from external program memory rather than internal mask ROM, and the -12 suffix rates it for 0 to 12 MHz operation. The package is printed with Temic's "T" mark and the TSC80C31-12CA part number, alongside the original "INTEL 80,82" copyright notice for the licensed core design - a normal marking scheme for second-source 8051-family parts of this era. It is housed in the standard 40-pin DIP package and sold here as a single reclaimed unit, not a tray or reel lot.

Key Features

• Part number TSC80C31-12CA, printed on the package
• CMOS single-chip 8-bit microcontroller, 8031/MCS-51 architecture
• ROMless design, runs from external program memory
• Rated for 0 to 12 MHz operation (-12 speed grade)
• Standard 40-pin DIP package
• Manufactured by Temic Semiconductor under licensed Intel core design

Applications

• Repairing a legacy embedded control board originally built around an 8031/80C31 microcontroller
• Restoring vintage industrial or lab equipment that used external-ROM 8051-family microcontrollers
• Sourcing one exact replacement chip for a bench repair without buying a reel or tray
• Keeping an older PLC or instrument control board running with a drop-in second-source part

Frequently Asked Questions

Is this really a Temic part, or an Intel chip?

Both marks are genuine. The package carries Temic's "T" logo and the TSC80C31-12CA part number - Temic manufactured this chip as a second source. The "INTEL 80,82" copyright text refers to the licensed 8031 core design, not the manufacturer.

Has this microcontroller been tested?

No. It is sold as a used, untested pull from decommissioned equipment. The photos are the spec - inspect the package and pin condition there before ordering.

What package does this microcontroller use?

A standard 40-pin DIP, socket-compatible with other 8031/8051-family parts in the same footprint.

What condition am I actually receiving this in?

You are buying exactly what the photos show: one used TSC80C31-12CA, pulled from decommissioned equipment, untested, sold as-is. Shipping is $8 flat rate, free once your order passes $28, and it leaves our Idaho warehouse the same or next business day.

Somewhere a control board ran on an Intel-designed brain that Temic built under license, one of the countless second-source chips that kept embedded gear running when the original supplier could not fill the order. Pull this used TSC80C31-12CA out of the parts bin and give it one more circuit to run.