The MC682 is a dual in-line package dip integrated circuit that appears across legacy industrial and consumer boards, yet its original manufacturer remains unclear in many documentation sets. Engineers and repair technicians frequently encounter this part when tracing older control and interface modules.
Below is a structured reference that maps key electrical, sourcing, and application attributes of the MC682 in a concise scan-friendly format. Use this table as a starting point for deeper research, reverse sourcing, or compatibility checks.
| Parameter | Typical Value | Notes | Source Status |
|---|---|---|---|
| Logic Family | Standard TTL compatible | Check datasheet for exact voltage levels | Unverified manufacturer |
| Pin Count | 24 pins | DIP package, 0.3 inch pitch | Common across clones |
| Operating Temp | >0 to 70 degree C commercial | Industrial variants may differ | Estimated from field devices |
| Typical Supply | 5 V plus or minus 5 percent | Verify quiescent current per application | No official label found |
Electrical Characteristics and Timing
Input and Output Voltage Levels
The MC682 follows standard TTL thresholds for high and low logic states. This means a verified high input reads above 2 volts, while a low input is reliably recognized below 0.8 volts under typical conditions.
Propagation Delay and Rise Time
Propagation delays are on the order of several tens of nanoseconds, suitable for non high speed clock or enable signals. Exact numbers depend on supply tolerances and temperature, so bench testing is advised for critical paths.
Pinout and Footprint Considerations
With a 24 pin dual in line layout, the MC682 aligns with common DIP sockets used in legacy test equipment and maintenance boards. Pin one is typically identified by a notch or dot marker on the package body.
When designing replacement circuits or adapters, maintain the 0.3 inch row spacing and avoid tight routing under the body region to reduce parasitic coupling. Confirm corner orientation with the datasheet graphics before soldering.
Application Circuits and Compatibility
Interface Shifting and Level Translation
Designers sometimes use the MC682 to convert logic families where only voltage levels differ, provided current requirements stay within absolute maximum ratings. Add series resistors and protection diodes where needed.
Legacy System Restoration
For vintage equipment and service manuals that reference this part, matching electrical behavior with a known good device is often sufficient. Avoid powering unknown units without current limiting during initial tests.
Key Takeaways and Recommendations
- Confirm the exact electrical ratings from any available datasheet or bench tests before integrating into new designs.
- Use the standard 24 pin DIP footprint and maintain proper orientation with notch or dot marker aligned.
- Verify compatibility with supply voltage and temperature range for your operating environment.
- Apply basic ESD precautions during handling, and validate functionality on a test bench before field deployment.
FAQ
Reader questions
Can I directly replace the MC682 with a modern microcontroller GPIO pin?
Yes, but use level shifters or series resistors to protect the microcontroller from overvoltage and ensure the current budget matches the load.
How do I verify that a black-topped MC682 is still functional on a board?
Power the board safely and test basic input output with a known signal source and a multimeter or oscilloscope to capture transition states.
Where can I trace the unknown manufacturer for this MC682 batch?
Check for secondary markings, date codes, and surface mount codes near the die attach, then cross reference with distributor markings and old procurement records.
Is the MC682 sensitive to electrostatic discharge during handling?
Treat it as ESD sensitive in uncontrolled environments; use grounded mats and wrist straps when removing or inserting the part on bench equipment.