PIC17C766T-33E/PT - 8-bit 33MHz PIC MCU 32KB OTP 80-TQFP | Microchip
MPN: PIC17C766T-33E/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.95 | $169.50 |
| 100 | $15.2 | $1,520.00 |
| 500 | $13.75 | $6,875.00 |
| 1,000 | $12.4 | $12,400.00 |
PIC17C766T-33E/PT Overview
An 8-bit PIC microcontroller (MCU) is a Harvard-architecture CMOS processor that uses a separate program and data bus to fetch instructions and operands in parallel, enabling deterministic single-cycle instruction execution. PIC MCUs occupy the lowest tier of the embedded controller hierarchy: microcontroller -> embedded controller -> RISC processor -> semiconductor. The PIC17C family specifically sits above the PIC16 and below the PIC18 in code density and peripheral integration, targeting applications that need more I/O and PWM channels than PIC16 parts can offer while remaining easy to program.
Key features include the PIC17C-series' 16-bit instruction word for compact code, 33 MHz maximum operating frequency (the '33' designator), 4.5 V to 5.5 V single-supply operation, hardware multiply, 8-level deep hardware stack, and up to 16 sources of interrupt. The 80-pin TQFP package exposes 50 to 66 I/O lines plus dedicated oscillator, reset, and power pins, giving designers enough headroom for human-interface or motor-control front-ends.
Typical applications include industrial control panels, motor-control front-ends (washing machines, small appliances, HVAC blowers), automotive body and chassis subsystems (pre-CAN era), instrument clusters, and white-goods user-interface boards. The Extended temperature grade also supports outdoor industrial installations. The Microchip product page notes that Microchip recommends PIC18F8520 as the recommended migration path for new designs, since the PIC17C766 family is no longer recommended for new designs.
When designing with this part, budget for an external oscillator or crystal across OSC1/OSC2, observe the 4.5 V brown-out threshold during power-supply ramp design, and allocate sufficient decoupling (one 100 nF per VDD/VSS pair) near the package. Designers should plan for OTP programming time and required programming voltage sequencing during production. This page consolidates distributor pricing, current lifecycle status, and a practical drop-in alternatives matrix not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC17C766T-33E/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-33E/PT (same form factor and footprint) — differing in Data Bus Width, I/O Pins, Operating Temperature, Package, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesPIC17C766T-33E/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC (8-bit Harvard RISC) |
| Core Processor | PIC17C |
| Maximum CPU Speed | 33 MHz |
| Instruction Execution | 121 ns single-cycle (8.25 MIPS) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 902 bytes |
| Supply Voltage (Vdd) | 4.5 V to 5.5 V |
| I/O Pins | 50 (some sources list 66) |
| Package | 80-TQFP (12 x 12 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +125C (Extended, 'E' grade) |
| Integrated Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Data Bus Width | 16-bit instruction word (8-bit data path) |
PIC17C766T-33E/PT 80-tqfp (12 x 12 mm) Pin Configuration Guide
Pin configuration for PIC17C766T-33E/PT (80-tqfp (12 x 12 mm) 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 PIC17C766T-33E/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC17C766T-33E/PT is suitable for 6 applications: Industrial Control Panels, Motor Control Front-Ends, Automotive Body and Chassis Subsystems, White Goods User Interfaces, Instrumentation and Data Acquisition Front-Ends, Security and Access Control Panels.
Industrial Control Panels
The PIC17C766T-33E/PT's 33 MHz core, 50+ I/O pins, and integrated PWM channels make it well suited to industrial control panels driving relays, indicator LEDs, keypads, and seven-segment displays. The Extended -40C to +125C temperature grade handles factory-floor thermal stress without derating. Its 32 KB OTP program memory holds substantial ladder-logic replacement or menu-driven HMI state machines. Place 100 nF decoupling capacitors on each VDD/VSS pair and route OSC1/OSC2 traces short to minimize EMI susceptibility in noisy switchgear cabinets.
Recommended
Motor Control Front-Ends
With multiple PWM outputs and 33 MIPS throughput, the PIC17C766T-33E/PT can drive BLDC or brushed-DC motor pre-drivers in washing machines, HVAC blowers, and small industrial pumps. The 8.25 MIPS core executes field-oriented control loops at acceptable PWM frequencies, and 902 bytes of RAM accommodate lookup tables for sine commutation. Brown-out Detect protects the MCU during motor inrush, while the Watchdog Timer recovers from ESD-induced firmware faults typical in motor wiring.
Recommended
Automotive Body and Chassis Subsystems
Although the PIC17C766 predates CAN-based automotive designs, it remains deployed in pre-CAN body controllers, instrument clusters, and seat/window modules. The Extended temperature grade survives under-dash thermal cycling, and Brown-out Reset plus Power-On Reset ensure reliable cold-crank behavior down to 4.5 V. With 32 KB OTP, the firmware holds diagnostic tables for bulb-out detection and stepper-motor calibration. Design note: pair with external CAN transceivers only if migrating the design to PIC18F8520 or dsPIC33EV for new platforms.
Recommended
White Goods User Interfaces
Dishwashers, refrigerators, and microwave ovens use the PIC17C766T-33E/PT to scan capacitive touch keys, drive VFD or LED displays, and sequence appliance cycles. The 33 MHz throughput executes user-interface state machines plus motor coordination with ample margin. OTP memory prevents field tampering with safety-critical firmware, a regulatory plus for IEC 60335 household appliance compliance. Brown-out Reset handles brownouts caused by compressor inrush, while Watchdog Timer recovers from power-line glitches.
Recommended
Instrumentation and Data Acquisition Front-Ends
The PIC17C766T-33E/PT's 33 MIPS performance and 50+ I/O lines are appropriate for handheld instrumentation such as multimeters, process calibrators, and portable environmental loggers. The Harvard bus allows deterministic ADC sampling at fixed rates, while 32 KB OTP holds calibration tables and linearization routines. Extended temperature grade supports outdoor field use. Connect to external 16- or 24-bit ADCs via the parallel port for precision measurements; the PIC18F8520 successor adds more peripherals but keeps the same instruction-set philosophy.
Recommended
Security and Access Control Panels
Security alarm panels, access controllers, and keypad entry systems leverage the PIC17C766T-33E/PT for I/O-rich scanning of reed switches, PIR sensors, and keypads. The Extended temperature grade tolerates outdoor enclosures, and the Watchdog Timer recovers from RF-induced firmware hangups typical in alarm-panel environments. With 32 KB OTP storing encrypted credential tables and event logs, plus Brown-out Detect for power-cut tamper detection, the part handles UL 681 alarm-system requirements. New designs should consider the Flash-based PIC18F8520.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C766T-33E/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C766T-33/PT | PIC17C766-33I/PT | PIC17C756AT-33E/PT |
|---|---|---|---|---|
| Package | 80-TQFP (12x12 mm) | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same | 64-TQFP - smaller |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Speed | 33 MHz | 33 MHz | 33 MHz | 33 MHz |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP |
| RAM Size | 902 bytes | 902 bytes | 902 bytes | 902 bytes |
| Operating Temperature | -40C to +125C (Extended) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| I/O Pins | 50 (some sources 66) | 50 | 50 | 50 (smaller package) |
| Lifecycle Status | NRND | NRND | NRND | NRND |
Key Differentiators
- Extended industrial -40C to +125C operating temperature grade (vs PIC17C766T-33/PT)
- 33 MHz maximum clock with 8.25 MIPS throughput (vs PIC17C766-16I/PT)
- 80-pin TQFP with 50+ I/O lines (vs PIC17C756AT-33E/PT)
Design Notes
The PIC17C766T-33E/PT operates from a single 4.5 V to 5.5 V supply. Place one 100 nF ceramic decoupling capacitor on each VDD/VSS pin pair, located within 5 mm of the package. For brown-out protection, ensure the regulator maintains Vdd above 4.5 V during inrush events. The integrated Brown-out Reset circuit trips when Vdd falls below the threshold, holding the MCU in reset until voltage recovers. Add bulk electrolytic capacitance (10 uF minimum) on the main rail.
The 80-pin TQFP uses 0.5 mm lead pitch and requires careful PCB layout. Use 0.4 mm-wide traces with 0.2 mm clearance, and consider micro-vias if routing on inner layers. Place a ground pour directly under the package to reduce thermal resistance and provide a low-impedance return path. Route OSC1/OSC2 traces symmetrically and keep them short (under 10 mm) to minimize clock jitter and EMI. Leave test pads on RESET, VPP, and PGM pins for in-circuit programming.
OTP program memory is written once during production and cannot be erased - any firmware bug becomes a permanent hardware revision. Plan for two prototype spins before committing to production programming. The Watchdog Timer must be explicitly enabled in firmware; a default-disabled WDT can leave the system hung on transient faults. The 'E' temperature grade does NOT guarantee 125C operation at maximum 33 MHz speed across all supply voltages; check the datasheet's frequency-vs-Vdd graph for hot-corner derating.
Compliance Information
PIC17C766 family launched in late 1990s; RoHS/Pb-free status varies by specific order code. Conflict-minerals compliance follows Microchip corporate policy. AEC-Q100 not formally qualified, though the Extended temp grade suits many automotive subsystems.
