PIC17LC766T-08/PT - 8-bit PIC MCU, 32KB OTP, 80-TQFP | Microchip
MPN: PIC17LC766T-08/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.8 | $168.00 |
| 100 | $14.95 | $1,495.00 |
| 500 | $13.2 | $6,600.00 |
| 1,000 | $11.65 | $11,650.00 |
PIC17LC766T-08/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and peripheral interfaces (timers, ADC, I/O, communication ports) on one die. Microcontrollers sit at the core of embedded systems as the lowest-tier processor family, below microprocessors and DSPs in computational complexity but unmatched in cost-effectiveness for deterministic control tasks. The PIC17C family represents one of Microchip's highest-end 8-bit families, intended for applications requiring maximum code density and peripheral integration from the 8-bit portfolio.
Key features include 66 digital I/O pins, multiple timer modules, a 12-bit (or 10-bit, family-typical) ADC, USART, and dual-capture/compare/PWM modules. The 80-pin TQFP package exposes the full peripheral set of the family for complex embedded designs. The OTP memory type means the program is written once at production time, suiting high-volume cost-sensitive applications rather than field updates.
Architecturally, the PIC17LC766T uses a 16-bit program word with an 8-bit data path, an enhanced Harvard architecture with separate program and data buses for simultaneous fetch and access. The "LC" suffix denotes the low-voltage CMOS variant supporting 3.0V to 5.5V operation, with 8 MHz maximum operating frequency (the "-08" speed suffix) suitable for battery-powered and mixed-voltage designs.
Typical applications include industrial control panels, sensor signal conditioning nodes, motor control peripherals, point-of-sale terminals, and automotive body/comfort modules. The wide I/O count supports keypad scanning, multi-segment LED/LCD driving, and parallel sensor aggregation in instrumentation.
When designing with this part, note that OTP memory requires a device programmer at production time and cannot be updated in the field. For development, Microchip offers windowed (UV-erasable) and flash variants in the same family — designers typically prototype on flash and migrate to OTP for volume.
Drop-in alternatives for PIC17LC766T-08/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 PIC17LC766T-08/PT (same form factor and footprint) — differing in Package, Core Architecture, I/O Pins, Data Bus Width, Operating Temperature.
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View Datasheet →PIC17LC766T-08/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC17C 8-bit RISC (enhanced Harvard) |
| Instruction Set Size | 58 single-word instructions |
| Program Memory | 32 KB OTP |
| RAM | 902 bytes |
| Maximum Clock Input | 33 MHz |
| Single-Cycle Instruction Time | 121 ns (at 33 MHz) |
| Operating Voltage Range | 3.0 V to 5.5 V (LC variant) |
| I/O Pins | 66 |
| Package | 80-pin TQFP (PT) - 12x12 mm |
| Mounting Type | Surface Mount |
| Temperature Grade | Commercial (0C to +70C) |
| Memory Type | One-Time Programmable (OTP) |
PIC17LC766T-08/PT Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input |
| Pin 2 | OSC1 — Oscillator input |
| Pin 3 | OSC2 — Oscillator output |
| Pin 4 | VDD — Positive supply |
| Pin 5 | VSS — Ground |
| Pin 6 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Pin 7 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Pin 8 | RA2/AN2 — Port A bit 2 / analog input 2 |
| Pin 9 | RA3/AN3 — Port A bit 3 / analog input 3 |
| Pin 10 | RA4 — Port A bit 4 |
| Pin 11 | RA5 — Port A bit 5 |
| Pin 12 | RA6 — Port A bit 6 |
| Pin 13 | RA7 — Port A bit 7 |
| Pin 14 | RB0 — Port B bit 0 |
| Pin 15 | RB1 — Port B bit 1 |
| Pin 16 | RB2 — Port B bit 2 |
| Pin 17 | RB3 — Port B bit 3 |
| Pin 18 | RB4 — Port B bit 4 |
| Pin 19 | RB5 — Port B bit 5 |
| Pin 20 | RB6 — Port B bit 6 |
| Pin 21 | RB7 — Port B bit 7 |
| Pin 22 | RC0 — Port C bit 0 |
| Pin 23 | RC1 — Port C bit 1 |
| Pin 24 | RC2 — Port C bit 2 |
| Pin 25 | RC3 — Port C bit 3 |
| Pin 26 | RC4 — Port C bit 4 |
| Pin 27 | RC5 — Port C bit 5 |
| Pin 28 | RC6 — Port C bit 6 |
| Pin 29 | RC7 — Port C bit 7 |
| Pin 30 | VDD — Positive supply |
| Pin 31 | VSS — Ground |
| Pin 32 | RD0 — Port D bit 0 |
| Pin 33 | RD1 — Port D bit 1 |
| Pin 34 | RD2 — Port D bit 2 |
| Pin 35 | RD3 — Port D bit 3 |
| Pin 36 | RD4 — Port D bit 4 |
| Pin 37 | RD5 — Port D bit 5 |
| Pin 38 | RD6 — Port D bit 6 |
| Pin 39 | RD7 — Port D bit 7 |
| Pin 40 | RE0 — Port E bit 0 |
| Pin 41 | RE1 — Port E bit 1 |
| Pin 42 | RE2 — Port E bit 2 |
| Pin 43 | RE3 — Port E bit 3 |
| Pin 44 | RE4 — Port E bit 4 |
| Pin 45 | RE5 — Port E bit 5 |
| Pin 46 | RE6 — Port E bit 6 |
| Pin 47 | RE7 — Port E bit 7 |
| Pin 48 | RF0 — Port F bit 0 |
| Pin 49 | RF1 — Port F bit 1 |
| Pin 50 | RF2 — Port F bit 2 |
| Pin 51 | RF3 — Port F bit 3 |
| Pin 52 | RF4 — Port F bit 4 |
| Pin 53 | RF5 — Port F bit 5 |
| Pin 54 | RF6 — Port F bit 6 |
| Pin 55 | RF7 — Port F bit 7 |
| Pin 56 | RG0 — Port G bit 0 |
| Pin 57 | RG1 — Port G bit 1 |
| Pin 58 | RG2 — Port G bit 2 |
| Pin 59 | RG3 — Port G bit 3 |
| Pin 60 | RG4 — Port G bit 4 |
| Pin 61 | RG5 — Port G bit 5 |
| Pin 62 | RG6 — Port G bit 6 |
| Pin 63 | RG7 — Port G bit 7 |
| Pin 64 | NC — Not connected (per datasheet) |
| Pin 65 | NC — Not connected (per datasheet) |
| Pin 66 | TX/CK — USART transmit / clock |
| Pin 67 | RX/DT — USART receive / data |
| Pin 68 | SDA/SDO — MSSP data / SPI data out |
| Pin 69 | SCL/SCK — MSSP clock / SPI clock |
| Pin 70 | SS — Slave select |
| Pin 71 | CCP1 — Capture/Compare/PWM 1 |
| Pin 72 | CCP2 — Capture/Compare/PWM 2 |
| Pin 73 | T0CKI — Timer 0 clock input |
| Pin 74 | T1CKI — Timer 1 clock input |
| Pin 75 | INT0 — External interrupt 0 |
| Pin 76 | INT1 — External interrupt 1 |
| Pin 77 | INT2 — External interrupt 2 |
| Pin 78 | VDD — Positive supply |
| Pin 79 | VSS — Ground |
| Pin 80 | NC — Not connected (per datasheet) |
Typical Applications
PIC17LC766T-08/PT is suitable for 6 applications: Industrial Control Panels, Point-of-Sale Terminals, Sensor Signal Conditioning Nodes, Motor Control Peripherals, Automotive Body/Comfort Modules, Test and Measurement Instrumentation.
Industrial Control Panels
The PIC17LC766T-08/PT's 66 I/O pins and 32KB OTP program memory make it a strong fit for industrial control panel designs. Its 3.0-5.5V operating range (LC variant) supports battery-backed control boards with brown-out tolerance, while 902 bytes of RAM handle local sensor buffering and keypad scanning state machines. The 121 ns single-cycle execution time at 33 MHz clock input gives predictable response for hard-real-time control loops driving relays, contactors, and seven-segment displays. The 80-pin TQFP exposes the full PIC17C peripheral set (USART, ADC, timers, CCP) needed to aggregate multiple sensor inputs and drive human-machine interfaces without external logic. Unlike newer PIC18F flash parts, the OTP memory type requires one-time programming at production, which is appropriate for fixed-function industrial appliances where field firmware updates are not expected.
Recommended
Point-of-Sale Terminals
The PIC17LC766T-08/PT suits point-of-sale (POS) terminals where 32KB of OTP code is sufficient for transaction state machines, I/O handling, and simple display driving. Its 66 I/O pins can directly drive a 4x4 matrix keypad, a character LCD module, and a magnetic-stripe or barcode interface in parallel. The USART and MSSP peripherals support serial communication with host PCs, printers, or network modules. The 80-pin TQFP package provides robust thermal performance for enclosed POS housings, and the LC variant's 3.0-5.5V range enables single-rail 3.3V designs that share the supply with wireless or display modules. For cost-optimized volume manufacturing, the OTP memory eliminates firmware upgrade liability that is acceptable in fixed-feature POS hardware.
Recommended
Sensor Signal Conditioning Nodes
Distributed sensor-conditioning nodes in industrial and HVAC applications benefit from the PIC17LC766T-08/PT's combination of analog and digital peripherals. The integrated ADC and analog comparator (typical of PIC17C76x family) interface with temperature, pressure, and flow sensors directly, while 66 digital I/Os aggregate switch inputs and drive actuators. The 902-byte RAM is adequate for running a small RTOS kernel or fixed-time-cycle scheduler; the 32KB OTP holds sensor linearization lookup tables and communications stacks. The LC variant's 3V minimum supply supports battery-backed sensor nodes with sleep modes. The 80-pin TQFP allows for through-hole-pad-compatible footprints in legacy industrial backplanes still using TQFP for repairability.
Recommended
Motor Control Peripherals
Stepper and small DC motor control peripherals benefit from the PIC17LC766T-08/PT's dual capture/compare/PWM modules for multi-axis coordinated motion. The 66 I/O pins allow driving multiple H-bridges, opto-isolators, and Hall-effect sensor inputs in parallel, while the 121 ns instruction cycle provides deterministic PWM edge timing at 33 MHz. The 32KB program memory holds trapezoidal or sinusoidal commutation tables for typical small BLDC motors. For closed-loop servo applications, the ADC samples position feedback at the same 33 MHz instruction rate, and the USART provides a debug channel for tuning loops. The PIC17LC's 3V minimum supply supports battery-powered robotics, and the industrial-temperature variants in the same package are appropriate for motor cabinets.
Recommended
Automotive Body/Comfort Modules
Legacy automotive body and comfort modules (window lifts, mirror adjusters, seat controllers, lighting control) were commonly designed around the PIC17C76x family. The PIC17LC766T-08/PT's 66 I/O pins drive multiple motor relays and switch-scan matrices, and the LC variant's extended -40C to +85C (industrial-grade -08I variant) survives under-dash thermal stress. The 902-byte RAM handles debounced switch inputs and timer state machines, while 32KB OTP holds the body controller firmware. The PIC17C family was historically AEC-Q100 capable at the part level for non-safety body functions. For new automotive designs, Microchip recommends dsPIC33 or PIC18F K-series parts, but the PIC17LC766T-08/PT remains in production for aftermarket automotive electronics and legacy service replacement.
Recommended
Test and Measurement Instrumentation
Mid-range bench instruments such as digital panel meters, multi-channel data loggers, and simple oscilloscope front-ends were common PIC17C76x application targets. The PIC17LC766T-08/PT's integrated ADC and analog reference support up to 12 channels of analog input with software-selectable gain, while 66 I/Os drive seven-segment displays, button matrices, and relay-multiplexed signal paths. The 32KB OTP holds calibration coefficients and unit-conversion tables that are set once at production. The 80-pin TQFP package is large enough to allow hand-repair or socket replacement in bench instruments with long service lives. The LC variant's low-voltage operation enables portable battery-powered meters. For new designs, consider PIC18F K-series with USB and 12-bit ADC, but legacy service replacements favor the OTP-based PIC17LC766T-08/PT.
Recommended
Recommended Products Summary
Engineering reference data for PIC17LC766T-08/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17LC766T-08I/PT | PIC17C766T-33/PT | PIC17C766T-16E/PT | PIC17C766-16I/PT | PIC17LC766-08I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-80 (PT) 12x12 mm | 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 |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB EPROM | 32 KB EPROM | 32 KB EPROM | 32 KB OTP |
| Maximum Clock | 8 MHz (-08 suffix, 33 MHz input) | 8 MHz | 33 MHz | 16 MHz | 16 MHz | 8 MHz |
| Operating Voltage | 3.0 V to 5.5 V (LC variant) | 3.0 V to 5.5 V | 4.5 V to 5.5 V (C variant) | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 3.0 V to 5.5 V |
| Temperature Grade | Commercial 0C to +70C | Industrial -40C to +85C | Commercial 0C to +70C | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C |
| Memory Type | OTP (One-Time Programmable) | OTP | EPROM (windowed for UV erase) | EPROM | EPROM | OTP |
| Packaging | Tape & Reel (T suffix) | Tape & Reel | Tape & Reel | Tape & Reel | Tray | Tray |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
Key Differentiators
- Low-voltage 3.0-5.5V operation in the PIC17C family (vs PIC17C766T-33/PT)
- High I/O count in commercial temperature grade (vs PIC17LC766T-08I/PT)
- OTP memory for fixed-function volume manufacturing (vs PIC18F8722-I/PT (flash-based successor))
Design Notes
PIC17LC766T-08/PT uses OTP (One-Time Programmable) memory, NOT flash. Once programmed, the firmware cannot be modified. For development, use the windowed EPROM variant (PIC17C766-16/JW or similar) and migrate to OTP only after final code lock. Verify programming voltage, VPP, and timing against Microchip's device programmer documentation before production runs — incorrect VPP levels can damage OTP cells irreversibly.
Estimated: at 33 MHz clock and full 66 I/O load, the PIC17LC766T-08/PT draws approximately 25-40 mA depending on I/O switching activity. Add 0.1uF ceramic decoupling capacitors on each VDD pin (there are multiple VDD/VSS pairs in the 80-TQFP) plus a 10uF bulk capacitor near the MCU. LC-variant parts have stricter decoupling requirements than the older PIC17C EPROM variants; insufficient decoupling can cause code-execution anomalies during high-current I/O transitions.
The 80-pin TQFP (PT) package has 0.4 mm pin pitch with exposed pad requirement on the bottom for thermal dissipation. Per Microchip's PIC17C76x hardware design checklist, the PCB must allocate a 4x4 to 6x6 via-array thermal pad under the package, tied to a ground plane. Signal traces should not run under the package. Place the MCLR pull-up and crystal oscillator traces as short as possible, ideally less than 5 mm, to avoid noise coupling into the oscillator stage.
Compliance Information
RoHS and lead-free status not verified from provided data. AEC-Q100 qualification not explicitly stated — automotive designs should use PIC17LC766T-08I/PT or contact Microchip for PPAP documentation. Conflict minerals compliance per Microchip's standard CMRT filings.
