PIC17C766-16E/PT - 8-Bit OTP MCU, 32KB, 16MHz, 80-TQFP | Microchip
MPN: PIC17C766-16E/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.95 | $9,950.00 |
PIC17C766-16E/PT Overview
What is an 8-bit OTP microcontroller? An 8-bit OTP (One-Time Programmable) microcontroller is a single-chip computer built around an 8-bit data path, with non-volatile program memory that can be written once and then becomes read-only - ideal for production volumes where field reprogramming is not required. It sits within the broader hierarchy of microcontroller -> embedded controller -> semiconductor IC, and the PIC17C family represents Microchip's highest-pin-count, highest-performance 8-bit architecture before the migration to PIC18 flash parts.
Key features of the PIC17C766 include 8.25 MIPS throughput (121 ns instruction cycle), 58 single-word instructions, upwards source-code compatibility with PIC16C5X, PIC12CXXX, and PIC16CXX devices, 33 levels of hardware stack, and a hardware multiplier that executes an 8x8 multiply in a single instruction cycle. The 80-pin TQFP footprint exposes a 16-bit external memory interface for systems that need more RAM or specialty memory-mapped peripherals than the on-chip 902 bytes provide.
The device is built on an enhanced CMOS process with low-power design techniques, supporting typical applications in industrial control, automotive body and chassis ECUs, appliance control, and instrumentation front-ends. The extended temperature grade and the broader PIC17C peripheral mix distinguish it from the smaller PIC16C and PIC17C75x predecessors. New designs are directed to the recommended replacement PIC18F8520 (per Microchip's product page note "A newer device is available. Please consider PIC18F8520.").
Design consideration: when migrating, validate the OTP programming timing, the external memory bus timing, and the ADC acquisition time against the new flash part; the PIC18F8520 is pin-to-pin compatible in many TQFP variants, but peripheral SFR addresses differ. This page synthesizes distributor pricing, drop-in alternatives, and practical sourcing notes not found in the bare manufacturer datasheet.
Drop-in alternatives for PIC17C766-16E/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 PIC17C766-16E/PT (same form factor and footprint) — differing in Package, Core Architecture, Data Bus Width, Operating Temperature, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C766-16/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17C766T-16E/PT
✅ Drop-In✓ In Stock
$10.4 / Unit
View Datasheet →PIC17C766-16I/PT
✅ Drop-In✓ In Stock
$11.5 / Unit
View Datasheet →PIC17C766T-16I/PT
✅ Drop-In✓ In Stock
$11.1 / Unit
View Datasheet →PIC18F8520
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17C766-16E/PT Maximum Ratings & Electrical Characteristics
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 902 bytes |
| Data EEPROM | Not present (OTP family) |
| CPU Core | PIC17C 8-bit RISC |
| Maximum Clock Frequency | 16 MHz |
| Instruction Execution Throughput | 8.25 MIPS (121 ns/instruction) |
| Instruction Set Size | 58 single-word instructions |
| Supply Voltage (Vdd) | 5 V typical (range per datasheet) |
| Operating Temperature Grade | Extended Industrial (-40C to +125C), -E suffix |
| ADC | 10-bit, up to 16 channels |
| PWM Modules | 3 |
| Capture Inputs | 4 |
| Serial Interfaces | SSP (SPI / I2C) + 2x USART (UART) |
| External Memory Bus | 16-bit address/data, external memory interface |
| Hardware Stack Levels | 33 |
| Hardware Multiplier | 8x8 in single instruction cycle |
| I/O Pins | Up to 66 (80-pin TQFP) |
| Package | 80-pin TQFP (PT), 12x12 mm, gull-wing |
| Terminal Form | GULL WING |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (per distributor listings) |
PIC17C766-16E/PT 80-pin tqfp (pt), 12x12 mm, gull-wing Pin Configuration Guide
Pin configuration for PIC17C766-16E/PT (80-pin tqfp (pt), 12x12 mm, gull-wing package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC17C766-16E/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC17C766-16E/PT is suitable for 6 applications: Industrial Process Control PLCs, Automotive Body and Chassis ECUs, Appliance and HVAC Control Boards, Instrumentation and Data Acquisition Front-Ends, Point-of-Sale and Printer Control Logic, Medical Device Control and Monitoring.
Industrial Process Control PLCs
The PIC17C766-16E/PT fits industrial PLC I/O modules thanks to its 32 KB OTP program memory, 16 channels of 10-bit ADC for analog sensor inputs, 3 PWM outputs for valve and actuator control, and the 80-pin TQFP package exposing a 16-bit external memory bus for large lookup tables. At 16 MHz / 8.25 MIPS, it executes PID loops with sub-100us cycle times while leaving headroom for HMI or Modbus stack tasks. The -40C to +125C extended temperature grade tolerates cabinet-mounted deployments. Unlike modern flash parts, OTP enforces code immutability - a security plus for locked-bill-of-materials industrial systems but a liability for any design needing field firmware updates.
Recommended
Automotive Body and Chassis ECUs
Body controllers, climate-control modules, and instrument cluster slaves benefit from the PIC17C766-16E/PT's automotive-grade operating temperature (-40C to +125C), 66 GPIO, and multiple serial interfaces. The 16 MHz PIC17C core handles CAN-style messaging via the dual USART and SSP, while the 10-bit ADC reads thermistors and position sensors. The 80-pin TQFP footprint provides enough pins for direct H-bridge, lighting, and switch-matrix wiring. For new automotive designs, the recommended flash-based PIC18F8520 supersedes the OTP PIC17C766; however, existing service-parts channels still source this MPN for warranty repair.
Recommended
Appliance and HVAC Control Boards
Washing machines, dishwashers, refrigerators, and HVAC thermostats use the PIC17C766-16E/PT for motor and compressor sequencing. The 3 PWM channels drive brushless DC or variable-frequency drives, while the 4 capture inputs sense tachometer feedback for closed-loop speed control. The 32 KB OTP program memory holds the state-machine plus diagnostic logics; the extended temperature range tolerates under-hood and behind-panel heat. OTP also protects the manufacturer's firmware IP from being read back or modified - a real anti-cloning advantage in mass-market appliances where reverse-engineering risk is high.
Recommended
Instrumentation and Data Acquisition Front-Ends
Multi-channel data loggers and bench-top instrumentation use the PIC17C766-16E/PT's 10-bit ADC with up to 16 channels, 902 bytes of RAM, and external memory bus to buffer sample streams before forwarding them via UART or SPI. The 8.25 MIPS throughput sustains sampling rates in the tens of kHz range while running an on-device user interface. The 80-pin TQFP makes hand-prototyping feasible on standard 0.5 mm-pitch breakout boards. Designers of new instruments should consider the PIC18F8520 for its flash-based in-system programming and expanded RAM, while preserving the same ADC channel count.
Recommended
Point-of-Sale and Printer Control Logic
Receipt printers, barcode scanners, and POS terminals leverage the PIC17C766-16E/PT's dual USART for host and peripheral comms, SSP for SPI/I2C peripherals, and 80-pin TQFP for connection to keypads, displays, and stepper-motor paper feeders. The 32 KB OTP memory holds font tables and command interpreters. The OTP also locks the firmware against tampering, which is desirable for payment-terminal security certifications. The extended temperature grade supports kitchen-printer and outdoor-terminal use cases where ambient heat is significant.
Recommended
Medical Device Control and Monitoring
Non-invasive medical devices such as infusion pumps, patient monitors, and laboratory analyzers historically used the PIC17C766-16E/PT for its deterministic 8-bit core and extended temperature grade. The 16-channel ADC reads sensor arrays, while the PWM outputs drive audible and visual alarms. The 902-byte RAM and external memory bus enable large reference tables for sensor calibration. New medical designs are migrating to the PIC18F8520 flash part for IEC 60730 software-class-B support, but legacy service channels continue to source the OTP PIC17C766-16E/PT for warranty repair of deployed equipment.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C766-16E/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C766-16/PT | PIC17C766T-16E/PT | PIC17C766-16I/PT | PIC17C766T-16I/PT | PIC18F8520 |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-pin TQFP (PT) | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB Flash |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 40 MHz |
| Temperature Grade | Extended (-40C to +125C) | Commercial (0C to +70C) | Extended (-40C to +125C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Extended (-40C to +125C) |
| Memory Type | OTP | OTP | OTP | OTP | OTP | Flash (re-programmable) |
| ADC | 10-bit, up to 16 channels | 10-bit, up to 16 channels | 10-bit, up to 16 channels | 10-bit, up to 16 channels | 10-bit, up to 16 channels | 10-bit, up to 16 channels |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Active (recommended replacement) |
Key Differentiators
- Extended industrial temperature grade at 16 MHz (vs PIC17C766-16/PT)
- Tape-and-reel packaging variant available (vs PIC17C766T-16E/PT)
- Flash-based replacement available with same footprint (vs PIC18F8520)
Design Notes
The PIC17C766-16E/PT uses One-Time Programmable (OTP) memory, meaning firmware is written once and cannot be updated in-circuit. Plan programming time and verification flow carefully during production - a single bad write bricks the device. For any design anticipating field firmware updates, migrate to the flash-based PIC18F8520 instead, which is the manufacturer-recommended replacement on the same 80-pin TQFP footprint.
Estimated: at full 16 MHz operation with all peripherals active, the PIC17C766-16E/PT dissipates approximately 200-300 mW. The 80-pin TQFP package provides adequate thermal mass for the extended temperature grade (-40C to +125C) without an external heatsink, but designers should still provide a copper pour connected to all GND pins to keep junction-to-ambient thermal resistance low. Verify with the manufacturer's thermal model before locking the layout.
Place decoupling capacitors (0.1 uF ceramic + 10 uF bulk) as close as possible to the VDD/VSS pairs of the PIC17C766-16E/PT. The 80-pin TQFP at 0.5 mm pitch demands reflow-profile control (peak 245C typical) and soldering-pad design per IPC-7351. Use a 4-layer PCB with continuous ground plane for the analog ADC channels to minimize digital switching noise coupling into the 10-bit ADC inputs.
Compliance Information
RoHS compliance confirmed by distributor listings (Hotenda, DigiKey). REACH, halogen-free, and conflict-minerals status not stated in the verified web data; flagged as unknown per Data Authenticity Rule 1. AEC-Q100 not explicitly claimed by Microchip for this part number.
