IC TMP4740

IC TMP4740 – 4-Bit NMOS Microcontroller | Toshiba TLCS-47 Series of IC TMP4740

The TMP4740 IC is a 4-bit NMOS single-chip microcontroller from Toshiba’s TLCS-47 series, designed for compact embedded control applications. This vintage microcontroller integrates essential functions such as ROM, RAM, input/output ports, timer/counter, divider, and serial communication, making it ideal for consumer electronics and industrial control boards. Datasheet sources identify it as a high-speed 4-bit MCU with around 90 instructions and up to 15-level subroutine nesting.

Built for efficient low-level processing, the TMP4740 microcontroller supports fast instruction execution (2 machine states at 4 MHz) and includes multiple interrupt functions, making it suitable for timing-sensitive applications. It is widely used in appliances, electronic timers, remote controls, calculators, control panels, and legacy embedded systems repair.

This IC is commonly available in DIP/SDIP package variants such as TMP4740P and TMP4740N, allowing easy PCB mounting and replacement in older circuit boards. Because of its reliable Toshiba architecture, it remains in demand among electronics technicians, repair engineers, and retro hardware enthusiasts looking for original replacement microcontrollers.

Key Features of IC TMP4740

• 4-bit NMOS microcontroller
• Toshiba TLCS-47 family
• Built-in ROM, RAM, I/O ports
• Integrated timer/counter and serial port
• 90 instruction set
• 6 interrupt sources
• Fast 2-state execution at 4 MHz
• Available in DIP / SDIP package
• Suitable for embedded control & repair work

Applications of IC TMP4740

• Consumer electronics
• Digital timers
• Home appliances
• Legacy control boards
• Industrial embedded systems
• Educational electronics projects

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