PIC17LC756A-08I/PT - 8-bit 8MHz 32KB OTP MCU 64-TQFP | Microchip
MPN: PIC17LC756A-08I/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.92 | $18.92 |
| 10 | $17.05 | $170.50 |
| 100 | $14.62 | $1,462.00 |
| 250 | $13.45 | $3,362.50 |
| 500 | $12.3 | $6,150.00 |
PIC17LC756A-08I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path. Within the broader semiconductor taxonomy, an MCU sits inside the microcontroller family, which itself is a sub-category of microprocessors and embedded computing devices. PIC microcontrollers use a Harvard RISC architecture and a 16-bit instruction word, so a 32 KB OTP array actually stores 16K instructions, giving them far higher code density than 8051-class devices while retaining a small footprint and deterministic interrupt response.
Key features include a maximum clock input of 33 MHz (8 MHz core / 08 speed grade), 2.5 V to 5.5 V single-supply operation, an 8-level hardware stack, and only 58 single-word instructions to learn. The peripheral set covers a 10-bit A/D converter, capture/compare/PWM modules, USART, and synchronous serial port. The LC variant offers low-voltage operation, while the I suffix designates the -40C to +85C industrial temperature grade and the /PT suffix indicates 64-pin TQFP tray packaging.
Typical applications include industrial control, motor control, smart-sensor signal conditioning, and embedded communication bridges. The wide 2.5-5.5 V supply range and generous I/O count make it a good fit for replacing discrete logic in cost-sensitive designs. A newer recommended migration is PIC18F6520, which adds Flash memory, more RAM, and improved peripherals while keeping the same 64-pin TQFP footprint.
When designing with this part, ensure your programmer supports OTP parts (the LC suffix indicates low-voltage, not low-power) and that the brown-out and watchdog timer configuration bits are correctly set for your application's power profile. Decoupling should use 100 nF ceramic on each VDD pin placed within 5 mm of the IC.
Drop-in alternatives for PIC17LC756A-08I/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 PIC17LC756A-08I/PT (same form factor and footprint) — differing in Core Architecture, Data Bus Width, Maximum Clock Frequency, Package, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17LC756A-08/PT
✅ Drop-In✓ In Stock
$7.8 / Unit
View Datasheet →PIC17C756A-16I/PT
✅ Drop-In✓ In Stock
$11.2 / Unit
View Datasheet →PIC17C756A-16E/PT
✅ Drop-In✓ In Stock
$16.8 / Unit
View Datasheet →PIC17C756AT-16/PT
✅ Drop-In✓ In Stock
$11.95 / Unit
View Datasheet →PIC17LC756AT-08I/PT
✅ Drop-In✓ In Stock
$8.4 / Unit
View Datasheet →PIC17C756A-33E/PT
✅ Drop-In✓ In Stock
$7.55 / Unit
View Datasheet →PIC17LC756A-08I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC17 RISC (Harvard) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 32 KB (16K x 16 instructions) |
| RAM Size | 902 bytes |
| Maximum Clock Frequency | 33 MHz (8 MHz at -08 speed grade) |
| Instruction Cycle Time | 121 ns (single-cycle) |
| Data Bus Width | 16 bits (instruction) / 8 bits (data) |
| Supply Voltage Range | 2.5 V to 5.5 V |
| I/O Pins | 50 (33-50 depending on peripheral use) |
| A/D Converter | 10-bit, 12 channels |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Package | 64-pin TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Instruction Set | 58 single-word instructions |
| RoHS Status | Compliant |
PIC17LC756A-08I/PT Pin Configuration
| Pin 1 | RA0/AN0 — Digital I/O / analog input channel 0 |
| Pin 2 | RA1/AN1 — Digital I/O / analog input channel 1 |
| Pin 3 | RA2/AN2 — Digital I/O / analog input channel 2 |
| Pin 4 | RA3/AN3/VREF+ — Digital I/O / analog input 3 / ADC VREF+ |
| Pin 5 | RA4/AN4 — Digital I/O / analog input channel 4 |
| Pin 6 | RA5/AN5 — Digital I/O / analog input channel 5 |
| Pin 7 | OSC1 — Crystal oscillator input |
| Pin 8 | OSC2 — Crystal oscillator output |
| Pin 9 | MCLR — Master clear reset (active low) |
| Pin 10 | VSS — Ground |
| Pin 11 | VDD — Positive supply |
| Pin 12 | RB0/INT0 — Digital I/O / external interrupt 0 |
| Pin 13 | RB1/INT1 — Digital I/O / external interrupt 1 |
| Pin 14 | RB2/INT2 — Digital I/O / external interrupt 2 |
| Pin 15 | RB3/INT3 — Digital I/O / external interrupt 3 |
| Pin 16 | RB4 — Digital I/O port B bit 4 |
| Pin 17 | RB5 — Digital I/O port B bit 5 |
| Pin 18 | RB6 — Digital I/O port B bit 6 |
| Pin 19 | RB7 — Digital I/O port B bit 7 |
| Pin 20 | VSS — Ground |
| Pin 21 | VDD — Positive supply |
| Pin 22 | RC0 — Digital I/O port C bit 0 |
| Pin 23 | RC1 — Digital I/O port C bit 1 |
| Pin 24 | RC2 — Digital I/O port C bit 2 |
| Pin 25 | RC3 — Digital I/O port C bit 3 |
| Pin 26 | RC4 — Digital I/O port C bit 4 |
| Pin 27 | RC5 — Digital I/O port C bit 5 |
| Pin 28 | RC6/TX — Digital I/O / USART transmit |
| Pin 29 | RC7/RX — Digital I/O / USART receive |
| Pin 30 | VSS — Ground |
| Pin 31 | VDD — Positive supply |
| Pin 32 | RD0 — Digital I/O port D bit 0 |
| Pin 33 | RD1 — Digital I/O port D bit 1 |
| Pin 34 | RD2 — Digital I/O port D bit 2 |
| Pin 35 | RD3 — Digital I/O port D bit 3 |
| Pin 36 | RD4 — Digital I/O port D bit 4 |
| Pin 37 | RD5 — Digital I/O port D bit 5 |
| Pin 38 | RD6 — Digital I/O port D bit 6 |
| Pin 39 | RD7 — Digital I/O port D bit 7 |
| Pin 40 | VSS — Ground |
| Pin 41 | VDD — Positive supply |
| Pin 42 | RE0 — Digital I/O port E bit 0 |
| Pin 43 | RE1 — Digital I/O port E bit 1 |
| Pin 44 | RE2 — Digital I/O port E bit 2 |
| Pin 45 | RE3 — Digital I/O port E bit 3 |
| Pin 46 | RE4 — Digital I/O port E bit 4 |
| Pin 47 | RE5 — Digital I/O port E bit 5 |
| Pin 48 | RE6 — Digital I/O port E bit 6 |
| Pin 49 | RE7 — Digital I/O port E bit 7 |
| Pin 50 | VSS — Ground |
| Pin 51 | VDD — Positive supply |
| Pin 52 | RF0/AN6 — Digital I/O / analog input channel 6 |
| Pin 53 | RF1/AN7 — Digital I/O / analog input channel 7 |
| Pin 54 | RF2/AN8 — Digital I/O / analog input channel 8 |
| Pin 55 | RF3/AN9 — Digital I/O / analog input channel 9 |
| Pin 56 | RF4/AN10 — Digital I/O / analog input channel 10 |
| Pin 57 | RF5/AN11 — Digital I/O / analog input channel 11 |
| Pin 58 | RF6 — Digital I/O port F bit 6 |
| Pin 59 | RF7 — Digital I/O port F bit 7 |
| Pin 60 | AVSS — Analog ground |
| Pin 61 | AVDD — Analog supply |
| Pin 62 | VREF- — ADC negative reference |
| Pin 63 | VREF+ — ADC positive reference |
| Pin 64 | NC — Not connected (per datasheet) |
Typical Applications
PIC17LC756A-08I/PT is suitable for 6 applications: Industrial Process Control, Motor Control and PWM Drive, Smart Sensor Signal Conditioning, Embedded Communication Bridge, HMI Keypad and Display Controller, Legacy Industrial Sustaining Engineering.
Industrial Process Control
The PIC17LC756A-08I/PT is well matched to industrial process controllers thanks to its 50 digital I/O lines and on-chip 10-bit A/D converter with up to 12 input channels. The 2.5 V to 5.5 V supply range accepts both 3.3 V and 5 V rails commonly found in PLC backplanes, while the 902 bytes of RAM buffer sensor scans before forwarding to a host. Its 8.25 MIPS throughput is sufficient for PID loops at 1 kHz rates on small mechanical systems, and the industrial -40C to +85C temperature grade handles unconditioned cabinet environments.
Recommended
Motor Control and PWM Drive
The PIC17LC756A-08I/PT integrates capture/compare/PWM modules suited for DC brushed and small stepper motor control. The 50 I/O pins drive H-bridge logic and accept encoder feedback, while the 121 ns instruction cycle keeps PWM update rates above 100 kHz for smooth torque control. The wide 2.5-5.5 V supply range allows direct battery operation in 3.3 V cordless tools. Designers should leverage the PWM fault input and configurable dead-band features documented in the PIC17C family reference manual.
Recommended
Smart Sensor Signal Conditioning
With its on-chip 10-bit A/D converter and 50 I/O pins, the PIC17LC756A-08I/PT serves as a front-end conditioner for multi-sensor instruments. The 902 bytes of RAM hold calibration constants and recent samples, while the 58-instruction RISC core executes linearization math in real time. The 32 KB OTP program memory stores lookup tables for thermocouple and RTD linearization. The industrial temperature grade and wide supply range let it sit next to the sensor head without additional regulation.
Recommended
Embedded Communication Bridge
The PIC17LC756A-08I/PT integrates a USART and synchronous serial port, allowing it to bridge between RS-232, RS-485, and SPI peripherals. Its 50 I/O pins easily drive multiple transceivers, and the 8.25 MIPS throughput handles protocol conversion at 115200 baud with margin to spare. The wide 2.5-5.5 V supply makes it compatible with both 3.3 V modern logic and legacy 5 V field equipment, while the OTP memory stores immutable protocol stacks for industrial networks.
Recommended
HMI Keypad and Display Controller
The 50 I/O pins on the PIC17LC756A-08I/PT can scan 8x8 matrix keypads while simultaneously driving character LCDs through software bit-banging, eliminating external controller ICs. The 902 bytes of RAM store menu state and the 32 KB OTP holds multilingual font tables. The 8 MHz clock provides enough throughput to debounce key presses and refresh displays without flicker. Low-voltage 2.5 V operation allows battery-backed display modules in portable instruments.
Recommended
Legacy Industrial Sustaining Engineering
Because Microchip has marked the PIC17LC756A-08I/PT as Not Recommended for New Designs, it is primarily used today to sustain long-lifecycle industrial products such as factory automation controllers, medical instruments, and aerospace ground support equipment already in the field. Its OTP memory provides immutable firmware that meets regulatory traceability for medical and aerospace certifications. Designers maintaining these products should plan migration to PIC18F6520 while keeping the PIC17LC756A-08I/PT firmware image as a known-good baseline.
Recommended
Recommended Products Summary
Engineering reference data for PIC17LC756A-08I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17LC756A-08/PT | PIC17C756A-16I/PT | PIC17C756A-16E/PT | PIC17C756AT-16/PT | PIC17LC756AT-08I/PT | PIC17C756A-33E/PT |
|---|---|---|---|---|---|---|---|
| Package | 64-pin TQFP (10x10 mm) | 64-pin TQFP - same | 64-pin TQFP - same | 64-pin TQFP - same | 64-pin TQFP - same | 64-pin TQFP - same | 64-pin TQFP - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP |
| RAM Size | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes |
| Max Clock | 8 MHz (-08 grade) | 8 MHz | 16 MHz | 16 MHz | 16 MHz | 8 MHz | 33 MHz |
| Supply Voltage | 2.5-5.5 V | 2.5-5.5 V | 4.5-5.5 V | 4.5-5.5 V | 4.5-5.5 V | 2.5-5.5 V | 4.5-5.5 V |
| Temperature Grade | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND | NRND |
Key Differentiators
- Low-voltage operation from 2.5 V (vs PIC17C756A-16I/PT)
- Industrial -40C to +85C temperature grade (vs PIC17LC756A-08/PT)
- On-chip 10-bit A/D with 12 input channels (vs PIC16F877A-I/P)
Design Notes
The PIC17LC756A-08I/PT requires four VDD/VSS pin pairs plus separate AVDD/AVSS for the analog section. Place one 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin and a single 10 uF bulk capacitor near the package. The analog supply AVDD should be filtered with a ferrite bead and a 10 uF + 100 nF pair to keep digital switching noise out of the ADC reference. Brown-out reset (BOR) must be enabled in configuration bits for any application where VDD could droop below 2.5 V during motor stalls or inductive load transients.
The 64-pin TQFP (10x10 mm) has a 0.5 mm pitch and requires IPC-7351 land patterns with 0.30 mm pads and 0.20 mm solder mask dams. Use NSMD (non-solder-mask-defined) pads for stronger solder joints, and place a continuous ground plane on the second layer directly beneath the IC to reduce EMI. Keep crystal traces short (under 10 mm) and surround them with a ground guard ring. Avoid routing high-speed digital signals across the analog AVSS/AVDD region to minimize ADC crosstalk.
Do not confuse the LC suffix (low-voltage, 2.5-5.5 V) with low-power; the PIC17 family has no sleep-mode current advantage over PIC17C parts at the same clock. OTP memory is one-time programmable - any bit-cell programming error is permanent and the device must be discarded. Configuration bits, including oscillator mode and watchdog timer enable, are programmed into the same OTP array and cannot be changed after programming. Always read-back configuration bits before programming to verify the device is blank.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified; PIC17 family was not designed for automotive safety-critical applications. Halogen-free status not explicitly stated in verified data - marked unknown.
