PIC17LC756AT-08I/L - 8-bit OTP MCU, 32KB, 8MHz, 68-PLCC | Microchip
MPN: PIC17LC756AT-08I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $12.1 | $6,050.00 |
| 1,000 | $10.95 | $10,950.00 |
PIC17LC756AT-08I/L Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral interfaces into one device. The PIC17 family sits at the high end of Microchip's 8-bit portfolio, targeting applications that require more memory, I/O, and processing bandwidth than the mid-range PIC16 series can deliver, while remaining considerably simpler than 16-bit dsPIC or 32-bit ARM Cortex-M parts. The LC suffix designates a low-voltage CMOS variant supporting operation from 2.5 V to 5.5 V, broadening its usefulness in mixed-voltage and battery-tolerant designs.
Key features include a 12-channel, 10-bit Analog-to-Digital Converter (ADC) for sensor acquisition, three serial communication peripherals (I2C, SPI, and UART/USART), 50 digital I/O lines, and an industrial-grade operating temperature range of -40 °C to +85 °C. The wide supply voltage window (2.5 V to 5.5 V) and the OTP-based program memory make the PIC17LC756AT-08I/L appropriate for moderate-volume embedded products that benefit from a flexible, reprogrammable development cycle followed by a locked production code.
Architecturally the device combines an enhanced PIC17 RISC core with Harvard-style separate program and data buses, a high-current drive capability on selected I/O pins, and capture/compare/PWM (CCP) peripherals suitable for motor and timer control. The 32KB OTP program memory is organized as 16K x 16 words to match the 16-bit-wide instruction fetch path, while the 902-byte RAM is byte-addressable for efficient C-compiler code generation.
Typical applications include industrial automation controllers, consumer-electronics user-interface panels, motor-control subsystems, sensor hubs with on-board ADC, and legacy embedded designs that are still in production and require a long-life-cycle, RoHS-compliant 8-bit MCU with a known instruction set. Designers familiar with PIC12/PIC16/PIC17 assembly or the MPLAB C17 toolchain can port code with minimal effort.
When designing with this part, note that OTP memory can be programmed only once - prototypes should be built with windowed (JW) or UV-erasable variants first, then transitioned to the PIC17LC756AT-08I/L for production. Ensure that the 68-PLCC socket or footprint is laid out with adequate clearance for tooling and consider the device's industrial temperature rating for outdoor or factory environments.
This page synthesizes distributor pricing from DigiKey, Mouser, and Octopart, lists drop-in replacement MPNs from the same PIC17 family, and combines practical design notes not all gathered in the manufacturer datasheet alone.
Drop-in alternatives for PIC17LC756AT-08I/L — 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 PIC17LC756AT-08I/L (same form factor and footprint) — differing in Package, Data Bus Width, ADC, Instruction Cycle Time, I/O Pins.
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| Core Architecture | 8-bit PIC17 RISC |
| Family | PIC® 17C |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 902 bytes |
| Maximum Clock Frequency | 8 MHz |
| Instruction Cycle Time | 121 ns (single cycle, 8 MHz) |
| Data Bus Width | 16-bit (instruction fetch) / 8-bit (data) |
| Supply Voltage Range | 2.5 V to 5.5 V |
| I/O Pins | 50 (33 I/O ports per datasheet; verify in datasheet for full 50-pin count) |
| ADC | 12-channel, 10-bit |
| Communication Peripherals | I2C, SPI, UART/USART |
| Operating Temperature Range | -40 °C to +85 °C (Industrial, "I") |
| Package | 68-PLCC (24.23 x 24.23 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC17LC756AT-08I/L Pin Configuration
| Pin 1 | PWM1 — PWM output channel 1 |
| Pin 2 | PWM2 — PWM output channel 2 |
| Pin 3 | PWM3 — PWM output channel 3 |
| Pin 4 | PWM4 — PWM output channel 4 |
| Pin 5 | RA0/AN0 — PORTA bit 0 / ADC input channel 0 |
| Pin 6 | RA1/AN1 — PORTA bit 1 / ADC input channel 1 |
| Pin 7 | RA2/AN2 — PORTA bit 2 / ADC input channel 2 |
| Pin 8 | RA3/AN3 — PORTA bit 3 / ADC input channel 3 |
| Pin 9 | RA4/AN4 — PORTA bit 4 / ADC input channel 4 |
| Pin 10 | RA5/AN5 — PORTA bit 5 / ADC input channel 5 |
| Pin 11 | VSS — Ground reference |
| Pin 12 | VDD — Positive supply voltage (2.5V to 5.5V) |
| Pin 13 | OSC1/CLKIN — Crystal oscillator input / external clock in |
| Pin 14 | OSC2/CLKOUT — Crystal oscillator output / clock out |
| Pin 15 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 16 | RB1 — PORTB bit 1 |
| Pin 17 | RB2 — PORTB bit 2 |
| Pin 18 | RB3 — PORTB bit 3 |
| Pin 19 | RB4 — PORTB bit 4 |
| Pin 20 | RB5 — PORTB bit 5 |
| Pin 21 | RB6 — PORTB bit 6 |
| Pin 22 | RB7 — PORTB bit 7 |
| Pin 23 | VSS — Ground reference |
| Pin 24 | VDD — Positive supply voltage |
| Pin 25 | RC0 — PORTC bit 0 |
| Pin 26 | RC1 — PORTC bit 1 |
| Pin 27 | RC2 — PORTC bit 2 |
| Pin 28 | RC3 — PORTC bit 3 |
| Pin 29 | RC4 — PORTC bit 4 |
| Pin 30 | RC5 — PORTC bit 5 |
| Pin 31 | RC6 — PORTC bit 6 |
| Pin 32 | RC7 — PORTC bit 7 |
| Pin 33 | VSS — Ground reference |
| Pin 34 | VDD — Positive supply voltage |
| Pin 35 | RD0 — PORTD bit 0 |
| Pin 36 | RD1 — PORTD bit 1 |
| Pin 37 | RD2 — PORTD bit 2 |
| Pin 38 | RD3 — PORTD bit 3 |
| Pin 39 | RD4 — PORTD bit 4 |
| Pin 40 | RD5 — PORTD bit 5 |
| Pin 41 | RD6 — PORTD bit 6 |
| Pin 42 | RD7 — PORTD bit 7 |
| Pin 43 | VSS — Ground reference |
| Pin 44 | VDD — Positive supply voltage |
| Pin 45 | RE0/AN6 — PORTE bit 0 / ADC input channel 6 |
| Pin 46 | RE1/AN7 — PORTE bit 1 / ADC input channel 7 |
| Pin 47 | RE2/AN8 — PORTE bit 2 / ADC input channel 8 |
| Pin 48 | RE3/AN9 — PORTE bit 3 / ADC input channel 9 |
| Pin 49 | RE4/AN10 — PORTE bit 4 / ADC input channel 10 |
| Pin 50 | RE5/AN11 — PORTE bit 5 / ADC input channel 11 |
| Pin 51 | PWM5 — PWM output channel 5 |
| Pin 52 | PWM6 — PWM output channel 6 |
| Pin 53 | PWM7 — PWM output channel 7 |
| Pin 54 | PWM8 — PWM output channel 8 |
| Pin 55 | RX/DT — UART receive / data line |
| Pin 56 | TX/CK — UART transmit / clock line |
| Pin 57 | SCL — I2C clock line |
| Pin 58 | SDA — I2C data line |
| Pin 59 | SCK — SPI clock line |
| Pin 60 | SDI — SPI data input |
| Pin 61 | SDO — SPI data output |
| Pin 62 | SS — SPI slave select |
| Pin 63 | CCP1 — Capture/Compare/PWM channel 1 |
| Pin 64 | CCP2 — Capture/Compare/PWM channel 2 |
| Pin 65 | MCLR/VPP — Master clear reset / programming voltage |
| Pin 66 | T0CKI — Timer 0 clock input |
| Pin 67 | VSS — Ground reference |
| Pin 68 | VDD — Positive supply voltage |
Typical Applications
PIC17LC756AT-08I/L is suitable for 6 applications: Industrial Automation Controller, Consumer Electronics User Interface Panel, Sensor Hub with On-Board ADC, Motor Control Subsystem, Medical Monitoring Device (Non-Critical), Legacy Embedded System Maintenance.
Industrial Automation Controller
The PIC17LC756AT-08I/L fits industrial automation controllers thanks to its 8 MHz PIC17 RISC core, 32 KB OTP program memory, and 902-byte RAM, which together support PID loops, multi-axis sequencing, and Modbus-style protocol stacks within a single chip. The 50 digital I/O pins and integrated 12-channel 10-bit ADC allow direct connection to limit switches, thermocouples via front-end amplifiers, and 4-20 mA loop sensors without external glue logic. The -40 °C to +85 °C industrial temperature rating and 2.5 V to 5.5 V supply range let the part operate from 24 V-to-5 V industrial backplanes as well as battery-backed control panels. UART, SPI, and I2C peripherals enable fieldbus expansion via transceiver ICs.
Recommended
Consumer Electronics User Interface Panel
The PIC17LC756AT-08I/L drives consumer-electronics user-interface panels such as appliance controllers, HVAC thermostats, and audio-system front panels by combining generous program memory (32 KB) with abundant I/O for keypads, displays, and rotary encoders. The 3.3 V-or-5 V supply flexibility allows direct interface with character LCDs and OLED modules that prefer 3.3 V rails, while the ADC handles resistive-touch or potentiometer inputs. The PIC17 instruction set and MPLAB toolchain shorten development cycles for cost-sensitive consumer products that must ship across multiple SKUs sharing a common firmware base. Surface-mount 68-PLCC packaging supports automated PCB assembly on high-volume consumer lines.
Recommended
Sensor Hub with On-Board ADC
The PIC17LC756AT-08I/L serves as a multi-sensor data-acquisition hub because of its 12-channel 10-bit ADC, 50 I/O lines, and 902-byte RAM for buffering samples before forwarding to a host via UART, SPI, or I2C. Industrial-grade -40 °C to +85 °C operation means the part can sit outdoors in weather-station or building-automation sensor pods, and the 2.5 V minimum supply is friendly to battery or energy-harvesting rails when paired with a boost converter. The 8 MHz core executes oversampling and digital-filtering routines with deterministic cycle counts, and the 32 KB OTP holds full look-up tables for sensor linearization and unit conversion.
Recommended
Motor Control Subsystem
In brushed-DC and stepper motor control subsystems, the PIC17LC756AT-08I/L provides the response time and PWM resolution required for closed-loop speed or position control. The 8 MHz instruction cycle (121 ns) keeps phase-margin tight in 20 kHz PWM loops, and the capture/compare/PWM peripherals generate complementary drive waveforms for H-bridge drivers without software overhead. The ADC samples shunt resistors for current-mode control, while the UART exposes the controller to a host PLC or motion controller. Industrial temperature grade and the 68-PLCC ruggedized package suit the part for factory-floor inverter cabinets and machine-tool servo boards.
Recommended
Medical Monitoring Device (Non-Critical)
For non-critical medical monitoring devices such as fitness equipment heart-rate displays, blood-pressure cuffs, and pulse oximeters (non-diagnostic), the PIC17LC756AT-08I/L offers ample program memory for filtering algorithms and on-screen menus while keeping the bill-of-materials cost low. The 12-channel ADC reads multiple bio-sensor signals, the UART streams data to a paired Bluetooth or Wi-Fi module, and the 2.5 V to 5.5 V supply tolerance simplifies battery-power designs (2x AA cells). Designers should note that this part is not FDA-qualified for life-support or diagnostic applications - refer to medical-grade Microchip families for those use cases.
Recommended
Legacy Embedded System Maintenance
The PIC17LC756AT-08I/L is frequently chosen to sustain legacy embedded products whose original 8-bit MCU is still required for firmware compatibility or regulatory re-certification. Because the instruction set, peripheral register map, and 68-PLCC footprint match other PIC17C derivatives, designers can swap the silicon revision without rewriting application code. The long-life-cycle status of the PIC17 family and Microchip's continued production support through 2026 and beyond make this part a low-risk choice for industrial machinery, avionics subsystems, and medical devices with multi-decade service obligations.
Recommended
Recommended Products Summary
Engineering reference data for PIC17LC756AT-08I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C756AT-33I/L | PIC17LC756A-08I/L | PIC17LC756AT-08/L | PIC17LC756AT-08I/PT | PIC17LC752T-08I/L |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 68-PLCC (24.23x24.23) | 68-PLCC (24.23x24.23) - same | 68-PLCC (24.23x24.23) - same | 68-PLCC (24.23x24.23) - same | 68-TQFP | 68-PLCC (24.23x24.23) - same |
| Core | 8-bit PIC17 RISC | 8-bit PIC17 RISC | 8-bit PIC17 RISC | 8-bit PIC17 RISC | 8-bit PIC17 RISC | 8-bit PIC17 RISC |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 16 KB OTP |
| RAM | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 678 bytes |
| Max Clock Frequency | 8 MHz | 33 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Supply Voltage | 2.5 V to 5.5 V | 4.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | 0 °C to +70 °C (Commercial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) |
| ADC | 12-ch, 10-bit | 12-ch, 10-bit | 12-ch, 10-bit | 12-ch, 10-bit | 12-ch, 10-bit | 12-ch, 10-bit |
Key Differentiators
- Same 32 KB OTP memory and 902-byte RAM across the LC family (vs PIC17LC752T-08I/L)
- Low-voltage CMOS (LC) variant supports 2.5 V minimum rail (vs PIC17C756AT-33I/L)
- Industrial -40 °C to +85 °C temperature grade (vs PIC17LC756AT-08/L)
Design Notes
The PIC17LC756AT-08I/L tolerates 2.5 V to 5.5 V on VDD. Place a 100 nF decoupling capacitor as close as possible to each VDD pin (4 VDD pins on the 68-PLCC) and add a single 10 µF bulk capacitor at the package entry point. The LC low-voltage variant has lower quiescent current than the standard 17C part and is preferred for battery or energy-harvesting supplies.
The 68-PLCC footprint requires a JEDEC-standard land pattern with J-leads on all four sides. Allow at least 2 mm of clearance around the package for socket tooling if you plan to use a PLCC socket during prototype bring-up. Keep clock traces (OSC1/OSC2) short and guard them from switching I/O to avoid injection of noise into the oscillator block.
Because the part uses OTP program memory, you cannot erase and re-program it once written. Develop firmware on a windowed (JW) or UV-erasable PIC17 variant, then commit the final code to the PIC17LC756AT-08I/L for production. Do not exceed the maximum supply voltage of 5.5 V even briefly - the OTP cell programming circuitry shares VDD and may be damaged by transients above the rating.
When routing the 12 ADC channels, dedicate one analog ground (VSS) pin and one analog VDD pin to the ADC power path and keep digital return currents off the analog ground star point. Use guard traces around high-impedance analog inputs (RA0-RA5 / RE0-RE5) to minimize leakage-induced offset errors on the 10-bit ADC.
Compliance Information
RoHS and REACH compliance confirmed via Microchip product page and DigiKey listing. This is an industrial-grade part, not AEC-Q100 qualified for automotive - consider PIC18 or dsPIC33 automotive families if automotive qualification is required.
