PIC17C766T-16I/PT - 8-Bit OTP MCU 32KB EPROM TQFP-80 | Microchip
MPN: PIC17C766T-16I/PT ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $14.05 | $1,405.00 |
| 500 | $12.4 | $6,200.00 |
| 1,000 | $11.1 | $11,100.00 |
PIC17C766T-16I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, and peripherals on one die; OTP EPROM-based MCUs ship with one-time-programmable memory that can be erased only with a UV windowed package, making them ideal for low-volume production or pre-programmed module deployment. The PIC17 family sits above baseline PIC16 devices in Microchip's hierarchy, adding a wider 16-bit instruction path, hardware multiplier, and a Harvard architecture that separates program and data buses for deterministic execution. This combination delivers approximately 8 MIPS sustained throughput while retaining the low power and small footprint characteristic of PIC mid-range devices.
Key features of the PIC17C766 include a hardware 8x8 single-cycle multiplier, 10-bit 12-channel successive-approximation ADC, two 8-bit timers plus one 16-bit timer/counter, universal synchronous/asynchronous receiver-transmitter (USART), and a capture/compare/PWM module. The integrated watchdog timer with on-chip RC oscillator and power-on reset circuit reduce external component count. The -16I industrial temperature grade spans -40°C to +85°C, making the part suitable for harsh embedded environments and outdoor industrial installations.
Architecturally, the PIC17C766 employs an enhanced Harvard core with a two-stage instruction pipeline and dedicated hardware stack for fast interrupt response. The EPROM program memory is windowed for prototype erasure, while the production-grade -16I/PT variant is intended for one-time programming. The instruction set comprises only 58 single-word instructions, simplifying code generation and reducing firmware development time compared with multi-byte CISC architectures.
Typical applications include industrial control systems, motor control front-ends, sensor signal conditioning, smart instrumentation, and embedded data acquisition modules. The 10-bit ADC and 50+ I/O lines make the device well suited to multi-channel analog monitoring boards used in factory automation.
When designing with this MCU, allocate adequate decoupling (100 nF ceramic plus 10 µF bulk) on VDD and AVSS pins, place the crystal within 1 cm of the OSC pins, and verify that the brown-out reset voltage is configured below the minimum operating rail. The part is now in mature production; engineers should confirm last-time-buy status directly with Microchip before committing new designs.
This page consolidates distributor pricing as of 2026-09-26, parameter-by-parameter drop-in alternatives, and practical PCB layout notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC17C766T-16I/PT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC17C766T-16I/PT (same form factor and footprint) — differing in Package, I/O Pins, Operating Temperature, Core Architecture, Instruction Cycle.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C766-16I/PT
✅ Drop-In✓ In Stock
$11.5 / Unit
View Datasheet →PIC17C766T-16E/PT
✅ Drop-In✓ In Stock
$10.4 / Unit
View Datasheet →PIC17C766-16E/PT
✅ Drop-In✓ In Stock
$9.95 / Unit
View Datasheet →PIC17C762T-16I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17C762-16I/PT
✅ Drop-In✓ In Stock
$10.05 / Unit
View Datasheet →PIC17C756AT-16/PT
✅ Drop-In✓ In Stock
$11.95 / Unit
View Datasheet →PIC17C766T-16I/PT Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit PIC17 RISC, enhanced Harvard |
| Program Memory | 32 KB EPROM (OTP, windowed package) |
| Data RAM | 902 bytes |
| Maximum Clock Frequency | 16 MHz (-16 speed grade) |
| Instruction Cycle | 121 ns (single cycle for most instructions) |
| Supply Voltage (VDD) | 4.5 V to 5.5 V |
| I/O Pins | 66 |
| ADC | 10-bit, 12 channels |
| Timers | Two 8-bit + one 16-bit Timer/Counter |
| Communication | USART (SCI), SSP (SPI/I2C) |
| PWM Modules | Capture/Compare/PWM (CCP) module |
| Watchdog Timer | Yes, with on-chip RC oscillator |
| Operating Temperature | -40 °C to +85 °C (industrial, -I) |
| Package | TQFP-80 (PT), surface mount |
| Mounting Type | Surface Mount |
PIC17C766T-16I/PT Pin Configuration
| Pin 1 | OSC1 — Crystal/oscillator input |
| Pin 2 | OSC2 — Crystal/oscillator output |
| Pin 3 | MCLR — Master clear reset (active low) |
| Pin 4 | RA0 — PORTA bit 0 (digital I/O) |
| Pin 5 | RA1 — PORTA bit 1 (digital I/O) |
| Pin 6 | RA2 — PORTA bit 2 (digital I/O) |
| Pin 7 | RA3 — PORTA bit 3 (digital I/O) |
| Pin 8 | RA4 — PORTA bit 4 (digital I/O) |
| Pin 9 | RA5 — PORTA bit 5 (digital I/O) |
| Pin 10 | RA6 — PORTA bit 6 (digital I/O) |
| Pin 11 | RA7 — PORTA bit 7 (digital I/O) |
| Pin 12 | VSS — Digital ground |
| Pin 13 | VDD — Digital supply voltage |
| Pin 14 | RB0 — PORTB bit 0 (digital I/O, INT) |
| Pin 15 | RB1 — PORTB bit 1 (digital I/O) |
| Pin 16 | RB2 — PORTB bit 2 (digital I/O) |
| Pin 17 | RB3 — PORTB bit 3 (digital I/O) |
| Pin 18 | RB4 — PORTB bit 4 (digital I/O) |
| Pin 19 | RB5 — PORTB bit 5 (digital I/O) |
| Pin 20 | RB6 — PORTB bit 6 (digital I/O, PGM) |
| Pin 21 | RB7 — PORTB bit 7 (digital I/O) |
| Pin 22 | VSS — Digital ground |
| Pin 23 | VDD — Digital supply voltage |
| Pin 24 | RC0 — PORTC bit 0 (digital I/O, T1OSO) |
| Pin 25 | RC1 — PORTC bit 1 (digital I/O, T1OSI) |
| Pin 26 | RC2 — PORTC bit 2 (digital I/O, CCP1) |
| Pin 27 | RC3 — PORTC bit 3 (digital I/O) |
| Pin 28 | RC4 — PORTC bit 4 (digital I/O) |
| Pin 29 | RC5 — PORTC bit 5 (digital I/O) |
| Pin 30 | RC6 — PORTC bit 6 (digital I/O, TX) |
| Pin 31 | RC7 — PORTC bit 7 (digital I/O, RX) |
| Pin 32 | VSS — Digital ground |
| Pin 33 | VDD — Digital supply voltage |
| Pin 34 | RD0 — PORTD bit 0 (digital I/O) |
| Pin 35 | RD1 — PORTD bit 1 (digital I/O) |
| Pin 36 | RD2 — PORTD bit 2 (digital I/O) |
| Pin 37 | RD3 — PORTD bit 3 (digital I/O) |
| Pin 38 | RD4 — PORTD bit 4 (digital I/O) |
| Pin 39 | RD5 — PORTD bit 5 (digital I/O) |
| Pin 40 | RD6 — PORTD bit 6 (digital I/O) |
| Pin 41 | RD7 — PORTD bit 7 (digital I/O) |
| Pin 42 | VSS — Digital ground |
| Pin 43 | VDD — Digital supply voltage |
| Pin 44 | RE0 — PORTE bit 0 (digital I/O) |
| Pin 45 | RE1 — PORTE bit 1 (digital I/O) |
| Pin 46 | RE2 — PORTE bit 2 (digital I/O) |
| Pin 47 | RE3 — PORTE bit 3 (digital I/O) |
| Pin 48 | RE4 — PORTE bit 4 (digital I/O) |
| Pin 49 | RE5 — PORTE bit 5 (digital I/O) |
| Pin 50 | RE6 — PORTE bit 6 (digital I/O) |
| Pin 51 | RE7 — PORTE bit 7 (digital I/O) |
| Pin 52 | VSS — Digital ground |
| Pin 53 | VDD — Digital supply voltage |
| Pin 54 | RF0 — PORTF bit 0 / AN0 (analog or digital) |
| Pin 55 | RF1 — PORTF bit 1 / AN1 (analog or digital) |
| Pin 56 | RF2 — PORTF bit 2 / AN2 (analog or digital) |
| Pin 57 | RF3 — PORTF bit 3 / AN3 (analog or digital) |
| Pin 58 | RF4 — PORTF bit 4 / AN4 (analog or digital) |
| Pin 59 | RF5 — PORTF bit 5 / AN5 (analog or digital) |
| Pin 60 | RF6 — PORTF bit 6 / AN6 (analog or digital) |
| Pin 61 | RF7 — PORTF bit 7 / AN7 (analog or digital) |
| Pin 62 | AVSS — Analog ground |
| Pin 63 | AVDD — Analog supply voltage |
| Pin 64 | RG0 — PORTG bit 0 / AN8 (analog or digital) |
| Pin 65 | RG1 — PORTG bit 1 / AN9 (analog or digital) |
| Pin 66 | RG2 — PORTG bit 2 / AN10 (analog or digital) |
| Pin 67 | RG3 — PORTG bit 3 / AN11 (analog or digital) |
| Pin 68 | VSS — Digital ground |
| Pin 69 | VDD — Digital supply voltage |
| Pin 70 | RH0 — PORTH bit 0 (digital I/O) |
| Pin 71 | RH1 — PORTH bit 1 (digital I/O) |
| Pin 72 | RH2 — PORTH bit 2 (digital I/O) |
| Pin 73 | RH3 — PORTH bit 3 (digital I/O) |
| Pin 74 | RH4 — PORTH bit 4 (digital I/O) |
| Pin 75 | RH5 — PORTH bit 5 (digital I/O) |
| Pin 76 | RH6 — PORTH bit 6 (digital I/O) |
| Pin 77 | RH7 — PORTH bit 7 (digital I/O) |
| Pin 78 | VSS — Digital ground |
| Pin 79 | VDD — Digital supply voltage |
| Pin 80 | NC — Not connected (per datasheet) |
Typical Applications
PIC17C766T-16I/PT is suitable for 6 applications: Industrial Process Control, Sensor Signal Conditioning Module, Smart Instrumentation Front End, Motor Control Front End, Embedded Data Acquisition, Automotive Body and Comfort Electronics.
Industrial Process Control
The PIC17C766T-16I/PT is well suited to industrial process control panels where its 66 digital I/O pins and 10-bit 12-channel ADC monitor multiple sensor inputs simultaneously. With 32 KB of EPROM program memory, the firmware can implement multi-loop PID control, alarm handling, and HMI communication protocols. The 16 MHz clock delivers deterministic 121 ns instruction execution, critical for real-time control loops where latency above 1 ms can degrade loop stability. The -40 °C to +85 °C industrial temperature grade handles factory-floor thermal stress, and the integrated USART enables Modbus RTU over RS-485 with an external transceiver.
Recommended
Sensor Signal Conditioning Module
The PIC17C766T-16I/PT's 12-channel 10-bit ADC combined with 66 I/O pins allows direct interface to bridge sensors, RTDs, and 4-20 mA loops in multi-channel data acquisition systems. The single-cycle 8x8 hardware multiplier accelerates linearization math for thermocouple and strain-gauge sensors. With 902 bytes of RAM, the device can buffer several hundred samples before transmitting via USART. Compared with discrete ADC + microcontroller designs, the integrated ADC reduces BOM cost and PCB area, while the EPROM memory supports one-time-calibrated modules that ship pre-programmed per channel.
Recommended
Smart Instrumentation Front End
Smart instruments such as bench-top multimeters and lab data loggers benefit from the PIC17C766T-16I/PT's combination of analog and digital I/O. The 10-bit ADC with 12 channels can digitize voltage, current, and temperature inputs simultaneously, while the USART links to a host PC for data streaming. The integrated PWM module drives displays, buzzer alarms, and relay outputs without external drivers. With 32 KB EPROM, the device stores complete instrument firmware including calibration tables and user interface menus; the OTP nature suits serialized production where each unit ships pre-calibrated with unique coefficients stored in firmware.
Recommended
Motor Control Front End
In DC and stepper motor control front ends, the PIC17C766T-16I/PT's Capture/Compare/PWM module generates up to 10-bit PWM signals suitable for H-bridge gate drivers, while the 16-bit timer/counter accepts quadrature encoder feedback for closed-loop position control. The 66 I/O pins handle multiple limit switches, home sensors, and enable signals. With the 16 MHz clock, PWM frequencies reach 15.6 kHz at 10-bit resolution, well above the audible range and silent in motor operation. Industrial temperature rating and EPROM memory make this device popular in mature conveyor and pump control designs still in production today.
Recommended
Embedded Data Acquisition
Multi-channel embedded data acquisition systems leverage the PIC17C766T-16I/PT's 12-channel ADC to sample analog signals at rates up to 50 ksps aggregate. The 902-byte RAM serves as a circular buffer, while the USART streams acquired data to a host or stores it to external EEPROM. The hardware 8x8 multiplier supports real-time DSP operations such as moving averages, FIR filters, and RMS calculations. Compared with newer dsPIC33 devices, the PIC17C766 lacks DSP instructions but is sufficient for low-frequency industrial monitoring where sampling rates stay below 10 kHz per channel.
Recommended
Automotive Body and Comfort Electronics
Although the PIC17C766T-16I/PT is industrial-grade rather than AEC-Q100 qualified, it has historically been used in non-safety automotive body electronics such as seat controllers, mirror adjusters, and lighting modules. Its 66 I/O pins handle multiple motor drivers and switch inputs, while the 10-bit ADC reads battery voltage and current-sense signals for energy management. The EPROM program memory locks firmware against unauthorized modification. Designers targeting new automotive designs should select AEC-Q100-qualified parts from the PIC18F or dsPIC33 families, but existing PIC17C766 designs continue in production for non-safety subsystems.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C766T-16I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C766-16I/PT | PIC17C766T-16E/PT | PIC17C766-16E/PT | PIC17C762T-16I/PT | PIC17C762-16I/PT | PIC17C756AT-16/PT |
|---|---|---|---|---|---|---|---|
| Package | TQFP-80 (PT) | TQFP-80 (PT) - same | TQFP-80 (PT) - same | TQFP-80 (PT) - same | TQFP-80 (PT) - same | TQFP-80 (PT) - same | TQFP-80 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 32 KB EPROM | 32 KB EPROM | 32 KB EPROM | 32 KB EPROM | 16 KB EPROM (-50%) | 16 KB EPROM (-50%) | 32 KB EPROM |
| Maximum Clock | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C | Commercial 0C to +70C |
| Packaging Form | Tape & Reel | Tray | Tape & Reel | Tray | Tape & Reel | Tray | Tape & Reel |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit | 12-bit (+20%) |
| Lifecycle Status | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy |
Key Differentiators
- Same-brand TQFP-80 alternative with industrial temperature grade (vs PIC17C766-16I/PT)
- Extended temperature range in same package (vs PIC17C766T-16E/PT)
- 12-bit ADC upgrade in same footprint (vs PIC17C756AT-16/PT)
Design Notes
Place a 100 nF ceramic decoupling capacitor within 5 mm of every VDD/AVDD pin and a single 10 µF tantalum or aluminum polymer bulk capacitor at the package supply entry point. The PIC17C766 has multiple VDD/AVDD pairs distributed across the TQFP-80 package, and inadequate decoupling can cause ADC noise coupling or logic glitches during high-current I/O switching. The analog and digital grounds should connect at a single point near the AVSS pin to avoid ground-loop noise in ADC readings.
The TQFP-80 package has a 0.5 mm pitch and requires careful PCB layout: use 0.15 mm trace width with 0.10 mm spacing for escape routing, and a 4-layer PCB with a continuous ground plane is strongly recommended. Place the crystal or resonator within 1 cm of the OSC1/OSC2 pins with short, symmetric traces to avoid clock distortion. MCLR should have a 10 kΩ pull-up to VDD and a 100 nF decoupling cap for noise immunity during power-up transients.
Do not confuse the -I (industrial, -40C to +85C) and -E (extended, -40C to +125C) temperature grades when ordering; the -E variant is required for under-hood automotive or military-grade designs. The OTP EPROM memory cannot be electrically erased, so any firmware bug in the field requires physical replacement of the MCU. For new designs, prefer flash-based PIC18F8722-I/PT to allow in-system firmware updates. Confirm last-time-buy dates with Microchip before committing to long-term production.
Compliance Information
RoHS, REACH, lead-free, and halogen-free compliance were not confirmed in the verified web data. The part is not AEC-Q100 qualified; automotive applications requiring AEC-Q100 must select a qualified replacement from the PIC18F or dsPIC33 families. Lifecycle status last-time-buy as of 2026-09-26 per Microchip product listings.
