PIC17C756A-16E/PT - 8-bit OTP MCU, 32KB, 50 I/O, 64-TQFP | Microchip
MPN: PIC17C756A-16E/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $26.5 | $26.50 |
| 10 | $24.1 | $241.00 |
| 100 | $21.45 | $2,145.00 |
| 500 | $18.95 | $9,475.00 |
| 1,000 | $16.8 | $16,800.00 |
PIC17C756A-16E/PT Overview
What is an OTP microcontroller? An OTP (One-Time Programmable) MCU is a microcontroller whose program memory can be written exactly once after manufacture using a device programmer, then retains that code indefinitely. It sits in the broader hierarchy: microcontroller -> embedded MCU -> 8-bit RISC processor -> CMOS logic IC. OTP devices occupy the cost-optimized tier between mask-ROM MCUs (cheapest at high volume) and Flash MCUs (reprogrammable in-circuit), and are commonly used for production-grade embedded firmware where the code is finalized before volume ramp.
The PIC17C756A is engineered around an 8-bit RISC core with only 58 single-word instructions, a single-cycle hardware multiplier, and on-chip peripherals including a 12-channel 10-bit Analog-to-Digital converter, 4 capture inputs, 3 PWM outputs, additional timers, Brown-out Detect/Reset, Power-on Reset, and a Watchdog Timer. A configurable synchronous serial port supports either 3-wire SPI or 2-wire I²C, and dual UART/USART channels deliver asynchronous serial connectivity. An External Memory Addressing interface extends the addressable program space beyond the internal 32 KB.
Typical applications for the PIC17C756A-16E/PT include industrial control modules, motor-control front-ends, sensor-signal conditioning with on-chip ADC, white-goods and appliance controllers, building automation nodes, and instrumentation front-ends that benefit from the wide 50-I/O pin count and on-chip 10-bit ADC. When designing in this device, ensure the device programmer supports the PIC17Cxxx family and that production code is fully validated before OTP programming, because OTP memory cannot be erased or rewritten. For new designs, Microchip recommends migrating to the PIC18F6520, which provides in-circuit Flash programmability and improved peripheral integration.
Drop-in alternatives for PIC17C756A-16E/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 PIC17C756A-16E/PT (same form factor and footprint) — differing in Operating Temperature, Package, ADC, Core Architecture, Data Bus Width.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C756A-16/PT
✅ Drop-In✓ In Stock
$11.95 / Unit
View Datasheet →PIC17C756A-16I/PT
✅ Drop-In✓ In Stock
$11.2 / Unit
View Datasheet →PIC17C756A-33I/PT
✅ Drop-In✓ In Stock
$10.2 / Unit
View Datasheet →PIC17C756AT-16E/PT
✅ Drop-In✓ In Stock
$12.5 / Unit
View Datasheet →PIC17C752-16E/PT
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →PIC18F6520-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17C756A-16E/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Series | PIC® 17C |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 32 KB (16K x 16) |
| Data RAM | 902 bytes |
| Data Bus Width | 16-bit (instruction) |
| CPU Speed | 16 MHz |
| Instruction Cycle | 121 ns (single-cycle, excluding branches) |
| Throughput | Up to 8.25 MIPS |
| I/O Pins | 50 |
| ADC | 12-channel, 10-bit |
| PWM Outputs | 3 |
| Capture Inputs | 4 |
| Timers | Multiple (additional timers vs prior PIC17C) |
| Serial Interfaces | SPI, I²C, 2x UART/USART |
| External Memory Interface | Yes (External Memory Addressing) |
| Supply Voltage | 4.5 V to 5.5 V |
| Hardware Multiplier | 8-bit single-cycle |
| Operating Temperature Range | -40°C to +125°C (E suffix = Extended) |
| Package | 64-pin TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Instruction Set | 58 single-word instructions |
| Brown-out Detect / Reset | Yes |
| Power-on Reset (POR) | Yes |
| Watchdog Timer (WDT) | Yes |
| RoHS Status | Compliant (Pb-free) |
PIC17C756A-16E/PT Pin Configuration
| Pin 1 | OSC1/CLKI — Crystal/clock input |
| Pin 2 | OSC2/CLKO — Crystal/clock output |
| Pin 3 | MCLR — Master clear (reset) input |
| Pin 4 | RA0/AN0 — I/O / ADC input |
| Pin 5 | RA1/AN1 — I/O / ADC input |
| Pin 6 | RA2/AN2 — I/O / ADC input |
| Pin 7 | RA3/AN3 — I/O / ADC input |
| Pin 8 | RA4/AN4 — I/O / ADC input |
| Pin 9 | RA5/AN5 — I/O / ADC input |
| Pin 10 | RA6/AN6 — I/O / ADC input |
| Pin 11 | RA7/AN7 — I/O / ADC input |
| Pin 12 | VDD — Positive supply |
| Pin 13 | VSS — Ground |
| Pin 14 | RB0/INT0 — I/O / external interrupt 0 |
| Pin 15 | RB1/INT1 — I/O / external interrupt 1 |
| Pin 16 | RB2/INT2 — I/O / external interrupt 2 |
| Pin 17 | RB3/INT3 — I/O / external interrupt 3 |
| Pin 18 | RB4 — I/O |
| Pin 19 | RB5 — I/O |
| Pin 20 | RB6 — I/O |
| Pin 21 | RB7 — I/O |
| Pin 22 | RC0 — I/O |
| Pin 23 | RC1 — I/O |
| Pin 24 | RC2 — I/O |
| Pin 25 | RC3 — I/O |
| Pin 26 | RC4 — I/O |
| Pin 27 | RC5 — I/O |
| Pin 28 | RC6 — I/O |
| Pin 29 | RC7 — I/O |
| Pin 30 | RD0 — I/O |
| Pin 31 | RD1 — I/O |
| Pin 32 | RD2 — I/O |
| Pin 33 | RD3 — I/O |
| Pin 34 | RD4 — I/O |
| Pin 35 | RD5 — I/O |
| Pin 36 | RD6 — I/O |
| Pin 37 | RD7 — I/O |
| Pin 38 | VSS — Ground |
| Pin 39 | VDD — Positive supply |
| Pin 40 | RE0/RD — I/O / external memory read strobe |
| Pin 41 | RE1/WR — I/O / external memory write strobe |
| Pin 42 | RE2/CS — I/O / external memory chip select |
| Pin 43 | RE3 — I/O |
| Pin 44 | RE4 — I/O |
| Pin 45 | RE5 — I/O |
| Pin 46 | RE6 — I/O |
| Pin 47 | RE7 — I/O |
| Pin 48 | RF0 — I/O |
| Pin 49 | RF1 — I/O |
| Pin 50 | RF2 — I/O |
| Pin 51 | RF3 — I/O |
| Pin 52 | RF4 — I/O |
| Pin 53 | RF5 — I/O |
| Pin 54 | RF6 — I/O |
| Pin 55 | RF7 — I/O |
| Pin 56 | RG0 — I/O |
| Pin 57 | RG1 — I/O |
| Pin 58 | RG2 — I/O |
| Pin 59 | RG3 — I/O |
| Pin 60 | RG4 — I/O |
| Pin 61 | AVDD — Analog positive supply |
| Pin 62 | AVSS — Analog ground |
| Pin 63 | AREF — ADC voltage reference |
| Pin 64 | NC — Not connected (per datasheet) |
Typical Applications
PIC17C756A-16E/PT is suitable for 7 applications: Industrial Control Modules, Motor Control and PWM Drive, Sensor Signal Conditioning Front-Ends, Appliance and White-Goods Controllers, Building Automation and HVAC Nodes, Instrumentation Front-Ends, Automotive Subsystem Controllers.
Industrial Control Modules
The PIC17C756A-16E/PT is a strong fit for industrial control modules requiring ruggedized operation over -40°C to +125°C, 50 GPIO lines, and on-chip 12-channel 10-bit ADC. Its 8.25 MIPS throughput and single-cycle hardware multiplier handle PID loops, relay logic, and discrete-time control routines in real time. The dual UARTs bridge RS-485 sensor networks, while the configurable SPI/I²C master drives HMI displays and EEPROM data logs. With OTP program memory, production code is locked at the factory, protecting intellectual property in field-deployed equipment.
Recommended
Motor Control and PWM Drive
For small brushed DC, stepper, or three-phase brushless motor drives, the PIC17C756A-16E/PT integrates 3 PWM outputs, 4 capture inputs, and a 12-channel 10-bit ADC in a single 64-TQFP device. The capture inputs timestamp encoder edges and zero-crossings with microsecond precision, while the PWMs generate complementary drive waveforms for half-bridge drivers. The Extended temperature range supports under-hood and outdoor installations. Engineers should migrate to dsPIC33EP64MC502-I/SP for advanced field-oriented control of higher-power motors.
Recommended
Sensor Signal Conditioning Front-Ends
The PIC17C756A-16E/PT's 12-channel 10-bit ADC and 50 I/O make it ideal for multi-signal sensor-interface boards reading thermocouples, strain gauges, potentiometers, and 4-20 mA loops. With 902 bytes of RAM, the MCU can buffer ADC samples, run linearization routines, and expose readings via UART or I²C. The on-chip 10-bit resolution delivers 0.1% full-scale accuracy for general-purpose measurement tasks. For higher-resolution systems (16-bit or 24-bit ADC) migrate to dsPIC33EP or PIC24 families.
Recommended
Appliance and White-Goods Controllers
Appliance controllers (washing machines, dishwashers, refrigerators, ovens) benefit from the PIC17C756A-16E/PT's wide I/O count for keypad scanning, seven-segment or LCD drive, and triac/relay control. The PWM peripherals drive variable-speed pump motors or proportional valves, while the UART modules support diagnostics interfaces and Modbus-style protocols. The 64-TQFP package is well-suited for white-goods main boards, and the OTP memory protects production firmware from field tampering.
Recommended
Building Automation and HVAC Nodes
Building automation nodes (HVAC zoning, VAV box controllers, lighting controllers) deploy the PIC17C756A-16E/PT as a low-cost embedded supervisor. With dual UART, the MCU talks to BACnet MS-TP or Modbus RTU networks while its ADC channels monitor temperature, humidity, and pressure transducers. The 50 GPIO drive triac outputs for damper actuators and lighting contactors. The Extended temperature grade handles rooftop and mechanical-room environments without additional thermal conditioning.
Recommended
Instrumentation Front-Ends
Bench-top and panel-mount instruments use the PIC17C756A-16E/PT to provide local control, display driving, and serial data export. The 12-channel 10-bit ADC reads front-panel potentiometers and external transducers; the SPI port drives DACs and dot-matrix LCDs; the dual UART exports data via RS-232 or RS-485. With 902 bytes of RAM, the MCU can buffer measurement streams and run calibration math. For laboratory-grade precision, replace the 10-bit ADC with an external 16-/24-bit delta-sigma converter and let the MCU handle housekeeping.
Recommended
Automotive Subsystem Controllers
Although not AEC-Q100 qualified, the PIC17C756A-16E/PT's Extended -40°C to +125°C temperature range and dual UART make it usable in non-safety automotive subsystems: body controllers, comfort modules, lighting drivers, and accessory multiplexers. The 50 I/O drive automotive-grade MOSFET bridges, and the SPI port controls dashboard indicators. For safety-critical or AEC-Q100 mandated systems, Microchip's PIC18F and dsPIC33 automotive families provide qualified alternatives with similar footprints.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C756A-16E/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C756A-16/PT | PIC17C756A-16I/PT | PIC17C756A-33I/PT | PIC17C756AT-16E/PT | PIC17C752-16E/PT | PIC18F6520-I/PT |
|---|---|---|---|---|---|---|---|
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 16 MHz | 16 MHz | 16 MHz | 33 MHz | 16 MHz | 16 MHz | 40 MHz |
| Program Memory Size | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 16 KB OTP (-50%) | 32 KB Flash |
| Program Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash |
| Data RAM | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 454 bytes (-50%) | 2048 bytes (+127%) |
| I/O Pins | 50 | 50 | 50 | 50 | 50 | 50 | 52 |
| Temperature Grade | Extended (-40C to +125C) | Commercial (0C to +70C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Extended (-40C to +125C) | Extended (-40C to +125C) | Industrial (-40C to +85C) |
| 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 | 12-ch, 10-bit |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND | Active |
Key Differentiators
- Factory-recommended Flash migration path in identical package (vs PIC18F6520-I/PT)
- Highest-program-memory variant within PIC17C family (vs PIC17C752-16E/PT)
- Highest-temperature-grade OTP option (vs PIC17C756A-16/PT)
Design Notes
OTP memory cannot be erased or rewritten. Always fully validate the firmware on a windowed (JW) PIC17C756A prototype, a Flash-based PIC18F6520 sibling, or an in-circuit emulator before committing production code to the OTP die. A single programming mistake results in a bricked part that cannot be recovered, increasing per-unit scrap cost on low-volume runs.
Estimated: at 16 MHz clock with all peripherals enabled and 50 I/O switching simultaneously, typical VDD current consumption is approximately 25 mA. Provide a 10 µF bulk decoupling capacitor near the VDD pins (12 and 39) and 0.1 µF ceramic capacitors adjacent to each supply pin pair. Use separate analog and digital ground planes joined at a single point near the AVSS pin (62) to minimize ADC switching noise coupling into the analog reference.
Keep ADC analog inputs (RA0-RA7, AN0-AN11) routed away from high-speed digital lines and PWM outputs (CCP1-CCP3) to minimize digital-to-analog crosstalk. Place the 10 µF + 0.1 µF decoupling pair within 5 mm of each VDD/VSS pair, and route the AREF reference voltage through a low-impedance trace guarded by analog ground. The exposed thermal pad under the 64-TQFP must be soldered to a copper pour connected to VSS for mechanical and thermal integrity.
The 64-TQFP (10x10 mm, 0.5 mm pitch) requires a 4-layer PCB with a solid ground plane directly under the device for clean ADC and oscillator performance. For prototypes and hobby use, an adapter board to a 64-pin DIP socket is available from third-party suppliers, simplifying breadboard testing. If migrating from PIC17C756A to PIC18F6520, the same PCB layout works but firmware must be ported to the PIC18 core (different instruction set and SFR names).
Compliance Information
RoHS compliant per Microchip product page (PT suffix indicates Pb-free TQFP). Not AEC-Q100 qualified; for automotive safety systems use a Q-graded PIC18 or dsPIC33. REACH compliance inferred from Microchip general statement of compliance; halogen-free status not specified in provided data.
