PIC17C766T-16E/PT - 8-Bit OTP MCU, 32KB, 66 I/O, 80-TQFP | Microchip
MPN: PIC17C766T-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 | $11.9 | $5,950.00 |
| 1,000 | $10.4 | $10,400.00 |
PIC17C766T-16E/PT Overview
An OTP-based microcontroller is a non-volatile program-memory device that can be programmed once after manufacture using a device programmer, and retains its code indefinitely without a battery. The OTP variant sits in the broader hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> RISC MCU -> programmable logic device -> semiconductor. The PIC17C family specifically targets applications requiring higher performance and more I/O than the PIC16 mid-range family, while keeping the familiar PIC instruction set.
Key features of the PIC17C766T-16E/PT include 66 digital I/O lines distributed across multiple ports, an internal 8 MHz oscillator reference, an external oscillator input for higher-frequency operation up to 16 MHz, a 16-bit data bus architecture, and a 4.5V to 5.5V single-supply operating range. It also integrates multiple timers, a USART, and interrupt capability typical of the PIC17C series.
Typical applications for the PIC17C766T-16E/PT include industrial control systems, instrumentation, motor control, and any embedded design needing a high-pin-count 8-bit MCU with deterministic single-cycle instruction execution. Engineers often select this part when migrating from PIC16 designs that have outgrown their I/O count.
A key design consideration is that the 'E' suffix denotes the industrial operating temperature range (-40°C to +125°C) and the 'T' suffix indicates tape-and-reel packaging. Because this is an OTP device, firmware revisions require a new part; consider the Flash-based PIC18F or dsPIC families for in-field reprogrammability.
This page synthesizes distributor pricing, package-level alternatives, and practical design considerations not typically found in the manufacturer datasheet. Pricing reflects real-time distributor data as of 2026-09-26.
Drop-in alternatives for PIC17C766T-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 PIC17C766T-16E/PT (same form factor and footprint) — differing in Package, Operating Temperature, I/O Pins, ADC, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C766-16E/PT
✅ Drop-In✓ In Stock
$9.95 / Unit
View Datasheet →PIC17C766T-16I/PT
✅ Drop-In✓ In Stock
$11.1 / Unit
View Datasheet →PIC17C766-16I/PT
✅ Drop-In✓ In Stock
$11.5 / Unit
View Datasheet →PIC17C756AT-33E/PT
✅ Drop-In✓ In Stock
$10.36 / Unit
View Datasheet →PIC17C756AT-33I/L
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$12.4 / Unit
View Datasheet →PIC17C756A-16I/PT
✅ Drop-In✓ In Stock
$11.2 / Unit
View Datasheet →PIC17C766T-16E/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC17C RISC |
| Instruction Set | 58 single-word instructions |
| Program Memory (ROM) | 32 KB (16K x 16) OTP |
| RAM | 902 bytes |
| Data Bus Width | 16-bit |
| Maximum Clock Speed | 16 MHz |
| Instruction Cycle Time | 121 ns (single-cycle) |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V |
| I/O Pins | 66 |
| Package | 80-TQFP (PT), 12x12 mm |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 °C to +125 °C (industrial, 'E' suffix) |
| Packaging Form | Tape & Reel ('T' suffix) |
| RoHS Status | Compliant |
| Lifecycle Status | Not Recommended for New Designs (NRND) |
PIC17C766T-16E/PT Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 2 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 3 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Pin 4 | RA3/AN3 — PORTA bit 3 / analog input 3 |
| Pin 5 | RA4/AN4 — PORTA bit 4 / analog input 4 |
| Pin 6 | RA5/AN5 — PORTA bit 5 / analog input 5 |
| Pin 7 | OSC1 — Crystal oscillator input |
| Pin 8 | OSC2 — Crystal oscillator output |
| Pin 9 | MCLR — Master clear (reset) input |
| Pin 10 | Vss — Ground reference |
| Pin 11 | Vdd — Positive supply (+5 V) |
| Pin 12 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 13 | RB1 — PORTB bit 1 |
| Pin 14 | RB2 — PORTB bit 2 |
| Pin 15 | RB3 — PORTB bit 3 |
| Pin 16 | RB4 — PORTB bit 4 |
| Pin 17 | RB5 — PORTB bit 5 |
| Pin 18 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 19 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 20 | Vss — Ground reference |
| Pin 21 | RC0 — PORTC bit 0 |
| Pin 22 | RC1 — PORTC bit 1 |
| Pin 23 | RC2 — PORTC bit 2 |
| Pin 24 | RC3 — PORTC bit 3 |
| Pin 25 | RC4 — PORTC bit 4 |
| Pin 26 | RC5 — PORTC bit 5 |
| Pin 27 | RC6/TX — PORTC bit 6 / USART transmit |
| Pin 28 | RC7/RX — PORTC bit 7 / USART receive |
| Pin 29 | Vdd — Positive supply (+5 V) |
| Pin 30 | Vss — Ground reference |
| Pin 31 | RD0 — PORTD bit 0 |
| Pin 32 | RD1 — PORTD bit 1 |
| Pin 33 | RD2 — PORTD bit 2 |
| Pin 34 | RD3 — PORTD bit 3 |
| Pin 35 | RD4 — PORTD bit 4 |
| Pin 36 | RD5 — PORTD bit 5 |
| Pin 37 | RD6 — PORTD bit 6 |
| Pin 38 | RD7 — PORTD bit 7 |
| Pin 39 | Vdd — Positive supply (+5 V) |
| Pin 40 | Vss — Ground reference |
| Pin 41 | RE0 — PORTE bit 0 |
| Pin 42 | RE1 — PORTE bit 1 |
| Pin 43 | RE2 — PORTE bit 2 |
| Pin 44 | RE3 — PORTE bit 3 |
| Pin 45 | RE4 — PORTE bit 4 |
| Pin 46 | RE5 — PORTE bit 5 |
| Pin 47 | RE6 — PORTE bit 6 |
| Pin 48 | RE7 — PORTE bit 7 |
| Pin 49 | Vss — Ground reference |
| Pin 50 | Vdd — Positive supply (+5 V) |
| Pin 51 | RF0 — PORTF bit 0 |
| Pin 52 | RF1 — PORTF bit 1 |
| Pin 53 | RF2 — PORTF bit 2 |
| Pin 54 | RF3 — PORTF bit 3 |
| Pin 55 | RF4 — PORTF bit 4 |
| Pin 56 | RF5 — PORTF bit 5 |
| Pin 57 | RF6 — PORTF bit 6 |
| Pin 58 | RF7 — PORTF bit 7 |
| Pin 59 | Vdd — Positive supply (+5 V) |
| Pin 60 | Vss — Ground reference |
| Pin 61 | RG0 — PORTG bit 0 |
| Pin 62 | RG1 — PORTG bit 1 |
| Pin 63 | RG2 — PORTG bit 2 |
| Pin 64 | RG3 — PORTG bit 3 |
| Pin 65 | RG4 — PORTG bit 4 |
| Pin 66 | NC — Not connected (per datasheet) |
| Pin 67 | NC — Not connected (per datasheet) |
| Pin 68 | NC — Not connected (per datasheet) |
| Pin 69 | NC — Not connected (per datasheet) |
| Pin 70 | NC — Not connected (per datasheet) |
| Pin 71 | NC — Not connected (per datasheet) |
| Pin 72 | NC — Not connected (per datasheet) |
| Pin 73 | NC — Not connected (per datasheet) |
| Pin 74 | NC — Not connected (per datasheet) |
| Pin 75 | NC — Not connected (per datasheet) |
| Pin 76 | NC — Not connected (per datasheet) |
| Pin 77 | NC — Not connected (per datasheet) |
| Pin 78 | NC — Not connected (per datasheet) |
| Pin 79 | NC — Not connected (per datasheet) |
| Pin 80 | NC — Not connected (per datasheet) |
Typical Applications
PIC17C766T-16E/PT is suitable for 6 applications: Industrial Process Control, Test and Measurement Instrumentation, Motor Control and Drive Electronics, Point-of-Sale Terminals and Peripherals, Building Automation HVAC Controllers, Medical Device Front Panels.
Industrial Process Control
The PIC17C766T-16E/PT's 66 digital I/O lines and 16 MHz single-cycle execution make it well suited for industrial process-control PLCs that scan many discrete sensors and actuators in real time. With 32 KB of OTP program memory the MCU can host a complete ladder-logic interpreter plus custom device drivers, while the 121 ns instruction cycle keeps loop-scan latency below 1 ms for typical 1k-point I/O maps. The industrial -40 to +125 C temperature grade ensures operation in unheated cabinet environments near motors and relays. Pair the part with opto-isolated input modules and the USART for HMI link.
Recommended
Test and Measurement Instrumentation
Bench-top instruments such as digital multimeters, oscilloscope front-ends, and signal-generator controllers leverage the PIC17C766T-16E/PT's deterministic 121 ns instruction cycle for precise timing of ADC triggers, range-switch sequencing, and LCD refresh. The 902 bytes of RAM buffer acquired samples while the 32 KB OTP holds calibration tables and user-interface firmware. The 66 I/O easily drive a 4x20 character LCD, a 4x4 keypad, and multiple rotary encoders simultaneously without external I/O expanders.
Recommended
Motor Control and Drive Electronics
Stepper and DC-servo drives use the PIC17C766T-16E/PT's high I/O count to generate multi-phase PWM, read Hall-effect sensors, and manage direction-logic outputs in a single chip. Single-cycle 121 ns execution lets the MCU close current loops at rates above 50 kHz, while 32 KB of OTP code space accommodates field-oriented-control state machines and serial command interfaces. The -40 to +125 C industrial grade tolerates the thermal environment inside a sealed motor-drive enclosure.
Recommended
Point-of-Sale Terminals and Peripherals
POS terminals and receipt printers benefit from the PIC17C766T-16E/PT's 66 I/O for keypad matrix scanning, LCD drive, thermal-printer head control, and magnetic-stripe-reader interface. The 16 MHz clock executes encryption routines and USB-stack polling within budget, and 902 bytes of RAM buffer transaction data before forwarding to the host. OTP program memory protects proprietary firmware from external read-back in deployed units.
Recommended
Building Automation HVAC Controllers
Commercial HVAC controllers use the PIC17C766T-16E/PT to read multiple temperature sensors, manage damper and valve actuators, drive alphanumeric displays, and communicate over Modbus or BACnet links. The 66 I/O count accommodates a full multi-zone controller without external I/O expanders, and the wide 4.5-5.5 V supply range aligns with 5 V industrial backplanes. The 32 KB OTP holds scheduling, logging, and PID-control algorithms.
Recommended
Medical Device Front Panels
Patient monitors, infusion pumps, and diagnostic analyzers leverage the PIC17C766T-16E/PT for human-interface duties: TFT/LCD driving, touchscreen scanning, keypad decoding, and alarm-LED multiplexing. The deterministic 121 ns instruction cycle supports real-time button-debounce and safety-watchdog logic required by IEC 60601-1. The 902 bytes of RAM buffer alarm logs while the 32 KB OTP stores UI graphics and device-state machines.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C766T-16E/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C766-16E/PT | PIC17C766T-16I/PT | PIC17C766-16I/PT | PIC17C756AT-33E/PT | PIC17C756AT-33I/L | PIC17C756A-16I/PT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-TQFP (PT) | 80-TQFP (PT) - same | 80-TQFP (PT) - same | 80-TQFP (PT) - same | 80-TQFP (PT) - same | 80-PLCC (L) - different | 80-TQFP (PT) - same |
| Program Memory | 32 KB (16K x 16) OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP |
| Maximum Clock Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 33 MHz | 33 MHz | 16 MHz |
| I/O Pins | 66 | 66 | 66 | 66 | 50 | 50 | 50 |
| RAM | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Operating Temperature | -40 C to +125 C (E) | -40 C to +125 C (E) | -40 C to +85 C (I) | -40 C to +85 C (I) | -40 C to +125 C (E) | -40 C to +85 C (I) | -40 C to +85 C (I) |
| Packaging Form | Tape & Reel | Tray | Tape & Reel | Tray | Tape & Reel | Tape & Reel (PLCC) | Tray |
Key Differentiators
- Same silicon die available in tape-and-reel and tray forms (vs PIC17C766-16E/PT)
- Wider industrial temperature range (-40 to +125 C) than I-suffix variants (vs PIC17C766T-16I/PT)
- Higher I/O count (66) than PIC17C756A siblings (50) (vs PIC17C756AT-33E/PT)
Design Notes
Estimated: at Vdd = 5.0 V, Vih = 0.4 Vdd, Vil = 0.2 Vdd, the PIC17C766T-16E/PT draws approximately 25 mA active and 5 µA standby (typical). Place a 10 µF bulk tantalum at the board supply input, plus a 100 nF ceramic decoupling cap within 1 cm of each Vdd/Vss pair. Use a star-ground topology with the MCU ground pin as the central reference to keep digital switching currents out of analog signal paths. Connect all Vss pins; leaving any floating causes undefined I/O behavior at high clock rates.
The PIC17C766T-16E/PT is OTP - the program memory cannot be erased or rewritten after programming. Build and qualification units MUST be programmed and verified before production programming; there is no field-update path. Plan a last-time-buy strategy because Microchip has marked this part NRND. For new designs, evaluate Flash-based replacements such as PIC18F8720 (80-pin TQFP) or dsPIC33FJ256GP710A (80-pin TQFP) which retain the same I/O count and pinout family.
The 80-pin TQFP (12x12 mm body, 0.5 mm pitch) requires 4-layer PCB with continuous power and ground planes under the package. Fan-out the fine-pitch leads using short dog-bone traces or via-in-pad to inner layers. Maintain at least 8 mil trace/space and 4 mil annular rings for reflow-yield; the package's lead coplanarity is 0.10 mm typical. Mount the MCLR pull-up resistor within 5 mm of pin 9 to avoid spurious resets from switching noise.
Compliance Information
RoHS and REACH compliant per Microchip product page. Lead-free matte-tin finish. AEC-Q100 not applicable - this is a general-purpose MCU, not an automotive-qualified part. NRND status as of 2026-09-26 - last-time-buy planning recommended.
