PIC16C781T-I/SO
PIC16C781T-I/SO - 8-bit MCU 1.75KB OTP, 16 I/O, SOIC-20 | Microchip
The Microchip Technology PIC16C781T-I/SO is an 8-bit CMOS microcontroller built on the PIC16 mid-range RISC core with 1.75KB of one-time-programmable (OTP) program memory, 128 bytes of RAM, and 16 digital I/O lines, housed in a 20-pin SOIC (SO) package supplied on tape-and-reel. Operating from a 5V supply, the PIC16C781 is a derivative of the PIC16C7xx family and is differentiated by an unusually rich analog peripheral set for its era: an A/D converter, a D/A converter, an operational amplifier, two analog comparators, and a Programmable Switch-Mode Controller (PSMC) peripheral — a combination that previously required several discrete analog ICs around a conventional PIC.
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, and peripheral interfaces on one die. The PIC16C781 belongs to the 8-bit mid-range PIC16 family, which sits between Microchip's baseline 8-bit cores and the enhanced 16-bit cores in Microchip's product hierarchy. Within power management and signal conditioning systems, the on-chip op-amp, DAC, and PSMC allow this MCU to implement closed-loop control of a switching supply, charge pump, or sensor excitation circuit without external analog components, which reduces board area and BOM cost.
Key features of the PIC16C781T-I/SO include 1.75KB of OTP program memory, 128 bytes of data RAM, 16 bidirectional I/O pins, an 8-bit ADC, an 8-bit DAC, an on-chip op-amp, two analog comparators, a Programmable Switch-Mode Controller (PSMC), and a synchronous serial port supporting both SPI and I2C modes. The 20-pin SOIC package is industry-standard, and the -I temperature grade supports industrial ambient operation from -40C to +85C, suitable for factory-floor equipment, instrumentation, and ruggedized embedded modules.
The PIC16C781's architecture uses a Harvard layout with a separate instruction and data bus, and its RISC instruction set is fixed at 35 single-word instructions, allowing most instructions to execute in a single instruction cycle. The on-chip PSMC is the architecturally novel peripheral: it can be configured as a current-mode or voltage-mode PWM controller with programmable dead-time and frequency, and it interfaces to the on-chip op-amp and comparators so that current/voltage feedback loops can be closed entirely inside the silicon. This makes the part attractive for switching power supplies, motor drivers, and LED drivers where an external PWM controller would otherwise be required.
Typical applications include SMPS (switched-mode power supply) primary-side control, LED driver controllers with analog dimming, sensor signal conditioning with on-chip amplification, battery charger control loops, motor speed control, and industrial instrumentation front ends. Because the program memory is OTP rather than flash, the PIC16C781T-I/SO is generally used in mature, high-volume production designs where code is finalized and field reprogramming is not required.
When designing with this part, note that OTP memory requires one-time programming in production — engineering development should use the PIC16F877 or PIC16F1936 flash equivalent, then transition to the OTP die for cost-down. Decoupling the VDD/VSS pins with 100 nF ceramics placed within 5 mm of each pin is critical, and the analog supply (AVDD/AVSS) should be filtered with a ferrite bead to preserve ADC and DAC linearity.
This page synthesizes distributor pricing as of 2026-09-19, drop-in alternatives from the same PIC16 family, and practical design notes not consolidated in the manufacturer datasheet itself.
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