Product Overview
National Semiconductor MM74C912N / INS8248N 6-Digit BCD Display Driver IC
Condition
Used. Equipment pull. Evaluation: Visual inspection only. Function testing not performed. Markings legible: National Semiconductor logo, +B8424, MM74C912N, INS8248N.
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Product Overview
National Semiconductor MM74C912N (also marked INS8248N) is a 6-digit BCD display controller and driver in a standard 28-pin DIP package. Designed to interface directly between digital logic systems and 7-segment LED displays with decimal points, the chip incorporates an internal multiplexing oscillator, 6-word RAM address storage, and direct digit/segment drive outputs.
Key Features
- Controls up to 6 digits of 7-segment LED displays plus decimal points
- Direct segment drive capability (100 mA typical) and digit base drive (20 mA typical)
- Integrated multiplexing oscillator and built-in BCD-to-7-segment decoder
- 5 data input lines, 3 digit address lines, and dedicated enable controls
- Wide operating voltage range: 3 V to 6 V (VCC)
- TTL-compatible digital inputs
- Standard 28-lead PDIP housing (0.600-inch row spacing, 0.100-inch lead pitch)
Applications
- Replacing failed display controller ICs on legacy bench test equipment, frequency counters, and digital panel meters
- Driving multi-digit 7-segment readouts in custom retrocomputing or homebrew embedded microcontroller projects
- Restoring vintage industrial automation panels and dedicated readout modules
Frequently Asked Questions
What is the difference between the MM74C912N and INS8248N markings on this IC?
The package carries both designations. INS8248N is National Semiconductor's designated cross-reference part number for the MM74C912N display driver.
What type of display does this driver support?
It is configured for multiplexed 7-segment LED displays with decimal points, supporting up to 6 distinct numeric digits.
Why buy this individual pulled display driver?
When repairing vintage test instruments or specialized displays, sourcing a single verified IC avoids the cost and delay of buying bulk lots of unverified chips. Orders ship same or next business day from our Idaho warehouse for a flat $8 rate, and orders over $28 ship free.
Old-school multiplexed logic chips hold their value because nothing else fits the original footprint quite as cleanly. Drop it into the socket and bring those vintage display segments back to life.
