PIC17LC756AT-08I/PT - 8-Bit 8MHz 32KB OTP MCU 64-TQFP | Microchip
MPN: PIC17LC756AT-08I/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.85 | $12.85 |
| 10 | $11.55 | $115.50 |
| 100 | $10.25 | $1,025.00 |
| 500 | $9.2 | $4,600.00 |
| 1,000 | $8.4 | $8,400.00 |
PIC17LC756AT-08I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (ROM/Flash/OTP), working RAM, peripheral set, and I/O on one die. Microcontrollers sit in the broader hierarchy of embedded processors -> microcontrollers -> 8-bit microcontrollers -> OTP-based microcontrollers. The PIC17C family specifically targets higher-performance 8-bit applications with RISC Harvard architecture, multiple timer/counter modules, USART, and PWM peripherals — bridging the gap between simple 8-bit MCUs and 16-bit dsPIC devices.
Key features include an 8 MHz maximum operating frequency, 121 ns instruction cycle, internal EEPROM data memory, dual analog comparators, capture/compare/PWM modules, USART serial port, and a hardware multiplier for faster arithmetic. The wide 2.5 V to 5.5 V supply range supports both 3.3 V and 5 V designs. The device is offered in windowed CERDIP, plastic DIP, and TQFP variants for prototyping and high-volume production.
The PIC17C756A architecture uses a 16-bit wide instruction word and a separate 8-bit data path, with Harvard memory structure isolating program and data buses. This enables deterministic single-cycle execution and predictable interrupt latency for real-time control. The device includes up to 12 channels of 12-bit A/D conversion, two PWM outputs, three 16-bit timer/counters, and a USART supporting RS-232/RS-485 communication.
Typical applications include industrial motor control, HVAC actuators, smart sensor nodes, automotive body electronics (non-safety), and consumer white-goods control boards. The 50 I/O pins permit direct connection to keypads, LED matrices, and parallel LCDs. Compared to modern PIC18F devices, the PIC17C756A is preferred when legacy codebases or pin-compatible migration from the original PIC17C family is required.
Designers should verify that target peripherals and timers match the PIC17LC756A silicon revision before porting code, and add a 0.1 uF decoupling capacitor adjacent to every VDD/VSS pair. Note that Microchip has formally migrated customers to the PIC18F6520 for new designs; the PIC17LC756A remains available for legacy and maintenance programs.
This page consolidates distributor pricing, drop-in same-package alternatives within the PIC17 family, and design notes not found in the manufacturer datasheet alone, giving procurement and engineering teams a single reference point for lifecycle decisions.
Drop-in alternatives for PIC17LC756AT-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 PIC17LC756AT-08I/PT (same form factor and footprint) — differing in Data Bus Width, I/O Pins, Core Architecture, Package, Instruction Cycle Time.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17LC756A-08I/PT
✅ Drop-In✓ In Stock
$12.3 / Unit
View Datasheet →PIC17LC756AT-08I/L
✅ Drop-In✓ In Stock
$10.95 / Unit
View Datasheet →PIC17LC756A-08I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$12.3 / Unit
View Datasheet →PIC17LC752T-08I/PT
✅ Drop-In✓ In Stock
$7.45 / Unit
View Datasheet →PIC17LC752T-08I/L
✅ Drop-In✓ In Stock
$4.35 / Unit
View Datasheet →PIC17C756AT-33I/L
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$12.4 / Unit
View Datasheet →PIC18F6520-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17LC756AT-08I/PT Maximum Ratings & Electrical Characteristics
| Product Family | PIC17C |
| Core Architecture | 8-bit RISC (Harvard) |
| Clock Speed (Max) | 8 MHz |
| Instruction Cycle | 121 ns (single cycle, 2-cycle branches) |
| MIPS | 8.25 MIPS |
| Program Memory | 32 KB (16K x 16) OTP |
| RAM | 902 bytes |
| I/O Pins | 50 |
| Supply Voltage | 2.5 V to 5.5 V |
| Data Bus Width | 16-bit (instruction) / 8-bit (data) |
| ADC | 12-bit, up to 12 channels |
| Timers | Three 16-bit timer/counters |
| Communication | USART (RS-232/RS-485) |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 64-pin TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Instruction Set | 58 single-word instructions |
| Analog Comparators | 2 |
| PWM Outputs | 2 |
| MSL Level | 3 (168 hours) |
PIC17LC756AT-08I/PT Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input or programming voltage |
| Pin 2 | OSC1 — Crystal oscillator input |
| Pin 3 | OSC2 — Crystal oscillator output |
| Pin 4 | RA0 — Port A bit 0 (digital I/O or analog input AN0) |
| Pin 5 | RA1 — Port A bit 1 (digital I/O or analog input AN1) |
| Pin 6 | RA2 — Port A bit 2 (digital I/O or analog input AN2) |
| Pin 7 | RA3 — Port A bit 3 (digital I/O or analog input AN3) |
| Pin 8 | RA4 — Port A bit 4 (digital I/O or analog input AN4) |
| Pin 9 | RA5 — Port A bit 5 (digital I/O or analog input AN5) |
| Pin 10 | RA6 — Port A bit 6 (digital I/O or analog input AN6) |
| Pin 11 | RA7 — Port A bit 7 (digital I/O or analog input AN7) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | RB0 — Port B bit 0 (digital I/O, external interrupt) |
| Pin 14 | RB1 — Port B bit 1 (digital I/O) |
| Pin 15 | RB2 — Port B bit 2 (digital I/O) |
| Pin 16 | RB3 — Port B bit 3 (digital I/O) |
| Pin 17 | RB4 — Port B bit 4 (digital I/O) |
| Pin 18 | RB5 — Port B bit 5 (digital I/O) |
| Pin 19 | RB6 — Port B bit 6 (digital I/O, ICD clock) |
| Pin 20 | RB7 — Port B bit 7 (digital I/O, ICD data) |
| Pin 21 | VDD — Positive supply (2.5 V to 5.5 V) |
| Pin 22 | VSS — Ground reference |
| Pin 23 | RC0 — Port C bit 0 (digital I/O or PWM output) |
| Pin 24 | RC1 — Port C bit 1 (digital I/O or PWM output) |
| Pin 25 | RC2 — Port C bit 2 (digital I/O) |
| Pin 26 | RC3 — Port C bit 3 (digital I/O) |
| Pin 27 | RC4 — Port C bit 4 (digital I/O) |
| Pin 28 | RC5 — Port C bit 5 (digital I/O) |
| Pin 29 | RC6 — Port C bit 6 (digital I/O, USART TX) |
| Pin 30 | RC7 — Port C bit 7 (digital I/O, USART RX) |
| Pin 31 | VSS — Ground reference |
| Pin 32 | RD0 — Port D bit 0 (digital I/O) |
| Pin 33 | RD1 — Port D bit 1 (digital I/O) |
| Pin 34 | RD2 — Port D bit 2 (digital I/O) |
| Pin 35 | RD3 — Port D bit 3 (digital I/O) |
| Pin 36 | RD4 — Port D bit 4 (digital I/O) |
| Pin 37 | RD5 — Port D bit 5 (digital I/O) |
| Pin 38 | RD6 — Port D bit 6 (digital I/O) |
| Pin 39 | RD7 — Port D bit 7 (digital I/O) |
| Pin 40 | VDD — Positive supply (2.5 V to 5.5 V) |
| Pin 41 | VSS — Ground reference |
| Pin 42 | RE0 — Port E bit 0 (digital I/O) |
| Pin 43 | RE1 — Port E bit 1 (digital I/O) |
| Pin 44 | RE2 — Port E bit 2 (digital I/O) |
| Pin 45 | RE3 — Port E bit 3 (digital I/O) |
| Pin 46 | RE4 — Port E bit 4 (digital I/O) |
| Pin 47 | RE5 — Port E bit 5 (digital I/O) |
| Pin 48 | RE6 — Port E bit 6 (digital I/O) |
| Pin 49 | RE7 — Port E bit 7 (digital I/O) |
| Pin 50 | VSS — Ground reference |
| Pin 51 | NC — Not connected (per datasheet) |
| Pin 52 | NC — Not connected (per datasheet) |
| Pin 53 | NC — Not connected (per datasheet) |
| Pin 54 | NC — Not connected (per datasheet) |
| Pin 55 | NC — Not connected (per datasheet) |
| Pin 56 | NC — Not connected (per datasheet) |
| Pin 57 | NC — Not connected (per datasheet) |
| Pin 58 | NC — Not connected (per datasheet) |
| Pin 59 | NC — Not connected (per datasheet) |
| Pin 60 | NC — Not connected (per datasheet) |
| Pin 61 | NC — Not connected (per datasheet) |
| Pin 62 | NC — Not connected (per datasheet) |
| Pin 63 | NC — Not connected (per datasheet) |
| Pin 64 | VSS — Ground reference |
Typical Applications
PIC17LC756AT-08I/PT is suitable for 6 applications: Industrial Motor Control, HVAC Actuator and Damper Control, Smart Sensor Hub with Analog Front-End, Automotive Body Electronics (Non-Safety), Consumer Appliance Control Boards, Legacy Industrial Controller Replacement.
Industrial Motor Control
The PIC17LC756AT-08I/PT fits industrial motor-control designs through its dual 16-bit PWM outputs, three 16-bit timer/counters, and 12-bit ADC with up to 12 channels — sufficient for closed-loop BLDC or stepper control. At 8.25 MIPS, the firmware can execute a 10 kHz control loop with comfortable margin for sensor sampling and PID computation. The 50 I/O pins drive gate drivers, encoder inputs, and fault signals directly without external glue logic, while the 2.5 V to 5.5 V supply range simplifies integration with both 3.3 V and 5 V gate drivers on the same board.
Recommended
HVAC Actuator and Damper Control
For HVAC damper and valve actuators, the PIC17LC756AT-08I/PT provides the 12-bit ADC precision needed for temperature and pressure sensing, while the USART enables communication with a central building controller via RS-485. The 902 bytes of RAM accommodates control loops and protocol stacks, and 50 I/O lines drive relays, triac interfaces, and character LCD displays. Industrial -40C to +85C temperature rating ensures reliable operation in unconditioned plant rooms, and the OTP program memory protects firmware IP after deployment.
Recommended
Smart Sensor Hub with Analog Front-End
The PIC17LC756AT-08I/PT's 12-channel 12-bit ADC, dual analog comparators, and 50 I/O pins make it suitable for multi-sensor aggregation hubs in industrial monitoring. Engineers can sample thermocouples, RTDs, and 4-20 mA loops directly, then process signals in firmware at 8.25 MIPS. The wide 2.5 V to 5.5 V supply range supports both loop-powered (3.3 V) and line-powered (5 V) topologies. USART enables forwarding data to a central PLC or gateway over RS-232/RS-485.
Recommended
Automotive Body Electronics (Non-Safety)
For non-safety body electronics such as seat controllers, mirror adjusters, and interior lighting, the PIC17LC756AT-08I/PT delivers 50 I/O pins, PWM outputs, and ADC channels at industrial temperature grade. Although not AEC-Q100 qualified, the device has been widely used in 12 V body modules with external load-dump protection. The OTP memory locks firmware against field tampering, and the 8 MHz clock supports LIN-style software UART for low-cost body networking. For new automotive designs, consider AEC-Q100-qualified PIC18F alternatives.
Recommended
Consumer Appliance Control Boards
White-goods controllers in washing machines, dishwashers, and microwave ovens benefit from the PIC17LC756AT-08I/PT's 50 I/O for keypad scanning, seven-segment or character-LCD display driving, and triac-based load switching. The 32 KB OTP program memory accommodates state-machine firmware and lookup tables, while the USART interfaces with inverter boards or sensor modules. Industrial temperature rating suits under-cabinet appliance environments where ambient can reach 70C during operation. OTP locking protects manufacturer firmware IP.
Recommended
Legacy Industrial Controller Replacement
For maintenance and lifecycle extension of legacy PIC17C756A-based equipment, the PIC17LC756AT-08I/PT provides an identical silicon replacement with extended voltage range (down to 2.5 V) and modern lead-free TQFP packaging. Industrial -40C to +85C operation matches the deployed fleet, and 50 I/O maintain backward compatibility with existing field wiring and I/O expansion boards. Engineers can drop the LC variant into the original PCB footprint and re-program from the same HEX file, minimizing re-certification cost.
Recommended
Recommended Products Summary
Engineering reference data for PIC17LC756AT-08I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17LC756A-08I/PT | PIC17LC752T-08I/PT | PIC18F6520-I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-pin TQFP (10x10 mm) | 64-pin TQFP - same | 64-pin TQFP - same | 64-pin TQFP - same |
| Core / Architecture | 8-bit RISC (PIC17C) | 8-bit RISC (PIC17C) - same | 8-bit RISC (PIC17C) - same | 8-bit RISC (PIC18F enhanced) - different family |
| Program Memory | 32 KB (16K x 16) OTP | 32 KB OTP - same | 16 KB OTP - 50% | 32 KB Flash - reprogrammable |
| Maximum Clock | 8 MHz | 8 MHz - same | 8 MHz - same | 40 MHz - 5x faster |
| RAM | 902 bytes | 902 bytes - same | 678 bytes - 25% | 2048 bytes - 2.3x |
| I/O Pins | 50 | 50 - same | 50 - same | 52 - same |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V - same | 2.5 V to 5.5 V - same | 2.0 V to 5.5 V - wider |
| Lifecycle Status | NRND | NRND | NRND | Active |
Key Differentiators
- Wide 2.5 V to 5.5 V supply range (LC variant) vs 5 V only on standard PIC17C756A (vs PIC17C756A-08I/PT (without 'L'))
- Microchip-recommended migration to Flash-based successor with active lifecycle (vs PIC18F6520-I/PT)
- 50 I/O pins with 12-channel 12-bit ADC on-chip vs external ADC requirements on simpler PIC16 family (vs PIC16LF877A-I/PT)
Design Notes
Place a 0.1 uF decoupling capacitor within 5 mm of every VDD/VSS pair on the 64-pin TQFP, and add a bulk 10 uF tantalum or ceramic capacitor adjacent to the highest-current VDD pin (typically pin 21). The PIC17LC756AT-08I/PT has multiple VDD/VSS pins (pins 21, 40 VDD; pins 12, 22, 31, 41, 50, 64 VSS) and all must be connected for proper operation. Decoupling prevents logic noise from coupling into the analog supply and reduces ADC sampling jitter. Brown-out reset (BOR) is enabled by configuration fuse and should be retained for industrial designs.
Route the 8 MHz crystal traces (OSC1/OSC2, pins 2-3) symmetrically and as short as possible, with ground guarding on both sides to minimize EMI pickup. The 64-pin TQFP (10x10 mm) has a 0.5 mm pitch, requiring fine-pick-and-place and proper PCB pad design per IPC-7351. Add a guard ring around the analog input pins (RA0-RA7) to isolate them from digital switching noise, since the 12-bit ADC can resolve 1 mV at full scale. For OTP programming, expose the MCLR/VPP pin (pin 1) to a header for in-circuit programming.
Do not assume the PIC17LC756AT-08I/PT is a drop-in for the PIC18F6520 - the peripheral register map, interrupt vector table, and instruction set differ between PIC17 and PIC18 families, so firmware must be ported even though the pinout is compatible. Configuration bits must be set for oscillator mode (HS for >4 MHz crystal), watchdog timer enable, code protection, and brown-out reset voltage. Using the wrong oscillator mode is the most common reason for non-starting boards; verify with a scope on OSC2 before debugging code.
Compliance Information
RoHS and REACH status not confirmed in provided data. Industrial temperature grade -40C to +85C; not AEC-Q100 qualified - this part is not recommended for safety-critical automotive applications.
