NEC D546C

NEC D546C is a 4-bit single-chip microcontroller that was commonly used as a control IC in vintage audio and industrial equipment.

Technical Specifications

The D546C is classified as a proprietary controller IC. 

• Package Type: Available in a large DIP42 (42-pin Dual In-line Package) for the standard IC, or sometimes referred to in discrete variants as TO-92.
• Operating Temperature: Specified over an extended range of -40°C to 105°C.
• Architecture: It is a mask-programmed microcomputer, meaning the internal software (microcode) is set during manufacturing and cannot be changed.