PIC17C756A-33/PT - 8-bit 33MHz 32KB OTP MCU 64-TQFP | Microchip
MPN: PIC17C756A-33/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.24 | $6.24 |
| 10 | $5.96 | $59.60 |
| 100 | $5.42 | $542.00 |
| 500 | $4.88 | $2,440.00 |
| 1,000 | $4.35 | $4,350.00 |
PIC17C756A-33/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), working RAM, peripherals (timers, ADC, communication ports, PWM), and I/O into one package. PIC17C756A-33/PT belongs to the high-end PIC17C family and the broader 8-bit PIC microcontroller hierarchy; while superseded by the Flash-based PIC18F family, it remains in use in long-lifecycle industrial, instrumentation, and legacy designs where OTP memory and a known instruction set are acceptable. Within the power management and signal-chain tree, PIC17C756A-33/PT serves as the digital control plane that supervises analog and power subsystems rather than as a power device itself.
Key differentiating features include a 12-channel 10-bit Analog-to-Digital Converter (A/D), 4 capture inputs, 3 PWM outputs, an 8x hardware single-cycle multiplier, and a synchronous serial port configurable as 3-wire SPI or 2-wire I2C plus 2 UART channels. External Memory Addressing extends the program/data space beyond the on-chip 32 KB. These peripherals target embedded control tasks that combine analog sensing, motor or actuator drive, and serial communication in one device.
Architecturally, the PIC17C756A-33/PT uses a Harvard RISC core with separate program and data buses, an 8-bit ALU, and dedicated hardware for the 8x8 multiplier so that MULWF executes in a single 121 ns cycle. Operating supply voltage is 4.5 V to 5.5 V and the instruction set is fully orthogonal across all 58 single-word opcodes, simplifying code generation for legacy codebases that target the PIC17C family. Compared with the newer Flash-based PIC18F6520 recommended by Microchip as a successor, the PIC17C756A is OTP (one-time programmable) and is therefore unsuitable for field firmware updates.
Typical applications include industrial process control, motor drive and PWM control loops, instrumentation with on-board A/D conversion, and embedded control boards with multiple serial buses. Because OTP memory is permanently programmed at production time, the part is best suited to high-volume or fully characterized designs rather than prototype or field-serviceable products.
When designing with the PIC17C756A-33/PT, ensure that the system clock source is stable, the MCLR reset network is properly decoupled, and that the analog AVdd/AVss rails are filtered with the values specified in the datasheet. Confirm in-system programming availability by selecting the correct memory type - OTP parts cannot be reprogrammed and the design must be fully validated before committing to production. This page combines verified distributor pricing and parametric data with drop-in cross references and practical design guidance not available from a single distributor listing.
Drop-in alternatives for PIC17C756A-33/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-33/PT (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Serial Interfaces, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C756A-16I/PT
✅ Drop-In✓ In Stock
$11.2 / Unit
View Datasheet →PIC17C756A-16E/PT
✅ Drop-In✓ In Stock
$16.8 / Unit
View Datasheet →PIC17C752-33/PT
✅ Drop-In✓ In Stock
$10.1 / Unit
View Datasheet →PIC17C752-33E/PT
✅ Drop-In✓ In Stock
$11.75 / Unit
View Datasheet →PIC17C752-16E/PT
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →PIC17C756A-33/PT Maximum Ratings & Electrical Characteristics
| Family | PIC17Cxxx |
| Core | 8-bit PIC RISC |
| Instruction Set | 58 single-word instructions |
| Maximum Clock Frequency | 33 MHz |
| Instruction Cycle Time | 121 ns |
| Throughput | 8.25 MIPS |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 32 KB (16K x 16) |
| Data RAM | 902 bytes |
| Digital I/O Pins | 50 |
| Supply Voltage | 4.5 V to 5.5 V |
| ADC | 12-channel, 10-bit |
| PWM Outputs | 3 |
| Capture Inputs | 4 |
| Serial Interfaces | SPI (3-wire) or I2C (2-wire), 2x UART |
| Hardware Multiplier | 8x8 single-cycle |
| External Memory Bus | Yes |
| Package | 64-pin TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
PIC17C756A-33/PT Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3 — PORTA bit 3 / Analog input 3 |
| Pin 6 | RA4/AN4 — PORTA bit 4 / Analog input 4 |
| Pin 7 | RA5/AN5 — PORTA bit 5 / Analog input 5 |
| Pin 8 | VSS — Ground |
| Pin 9 | OSC1 — Oscillator input |
| Pin 10 | OSC2 — Oscillator output |
| Pin 11 | RC0 — PORTC bit 0 (digital I/O) |
| Pin 12 | RC1 — PORTC bit 1 (digital I/O) |
| Pin 13 | RC2 — PORTC bit 2 (digital I/O) |
| Pin 14 | RC3 — PORTC bit 3 (digital I/O) |
| Pin 15 | RC4 — PORTC bit 4 (digital I/O) |
| Pin 16 | RC5 — PORTC bit 5 (digital I/O) |
| Pin 17 | RC6 — PORTC bit 6 (digital I/O) |
| Pin 18 | RC7 — PORTC bit 7 (digital I/O) |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Positive supply (4.5 V to 5.5 V) |
| Pin 21 | RB0 — PORTB bit 0 (digital I/O) |
| Pin 22 | RB1 — PORTB bit 1 (digital I/O) |
| Pin 23 | RB2 — PORTB bit 2 (digital I/O) |
| Pin 24 | RB3 — PORTB bit 3 (digital I/O) |
| Pin 25 | RB4 — PORTB bit 4 (digital I/O) |
| Pin 26 | RB5 — PORTB bit 5 (digital I/O) |
| Pin 27 | RB6 — PORTB bit 6 (digital I/O) |
| Pin 28 | RB7 — PORTB bit 7 (digital I/O) |
| Pin 29 | RD0 — PORTD bit 0 (digital I/O) |
| Pin 30 | RD1 — PORTD bit 1 (digital I/O) |
| Pin 31 | RD2 — PORTD bit 2 (digital I/O) |
| Pin 32 | RD3 — PORTD bit 3 (digital I/O) |
| Pin 33 | RD4 — PORTD bit 4 (digital I/O) |
| Pin 34 | RD5 — PORTD bit 5 (digital I/O) |
| Pin 35 | RD6 — PORTD bit 6 (digital I/O) |
| Pin 36 | RD7 — PORTD bit 7 (digital I/O) |
| Pin 37 | VSS — Ground |
| Pin 38 | VDD — Positive supply (4.5 V to 5.5 V) |
| Pin 39 | RE0 — PORTE bit 0 (digital I/O) |
| Pin 40 | RE1 — PORTE bit 1 (digital I/O) |
| Pin 41 | RE2 — PORTE bit 2 (digital I/O) |
| Pin 42 | RE3 — PORTE bit 3 (digital I/O) |
| Pin 43 | RE4 — PORTE bit 4 (digital I/O) |
| Pin 44 | RE5 — PORTE bit 5 (digital I/O) |
| Pin 45 | RE6 — PORTE bit 6 (digital I/O) |
| Pin 46 | RE7 — PORTE bit 7 (digital I/O) |
| Pin 47 | AVSS — Analog ground |
| Pin 48 | AVDD — Analog positive supply |
| Pin 49 | AN6 — Analog input 6 |
| Pin 50 | AN7 — Analog input 7 |
| Pin 51 | AN8 — Analog input 8 |
| Pin 52 | AN9 — Analog input 9 |
| Pin 53 | AN10 — Analog input 10 |
| Pin 54 | AN11 — Analog input 11 |
| Pin 55 | VREF+ — ADC voltage reference positive |
| Pin 56 | VREF- — ADC voltage reference negative |
| Pin 57 | RF0 — PORTF bit 0 (digital I/O) |
| Pin 58 | RF1 — PORTF bit 1 (digital I/O) |
| Pin 59 | RF2 — PORTF bit 2 (digital I/O) |
| Pin 60 | RF3 — PORTF bit 3 (digital I/O) |
| Pin 61 | RF4 — PORTF bit 4 (digital I/O) |
| Pin 62 | RF5 — PORTF bit 5 (digital I/O) |
| Pin 63 | RF6 — PORTF bit 6 (digital I/O) |
| Pin 64 | RF7 — PORTF bit 7 (digital I/O) |
Typical Applications
PIC17C756A-33/PT is suitable for 6 applications: Industrial Process Control, Motor Drive and PWM Control, Multi-Channel Data Acquisition, Embedded Instrumentation with A/D Conversion, Multi-Bus Communication Controllers, Legacy Industrial Control Board Replacement.
Industrial Process Control
The PIC17C756A-33/PT fits industrial process control boards because it combines 12 channels of 10-bit ADC with 50 digital I/O in a single 64-pin TQFP. At 33 MHz with 121 ns instruction cycle, the 8.25 MIPS throughput is sufficient for PID loops sampling multiple analog sensors at sub-millisecond rates. The 3 PWM outputs directly drive valve actuators or heater controls, while the SPI/I2C/UART ports connect to industrial networks. The 4.5 V to 5.5 V supply matches standard 5 V industrial backplanes.
Recommended
Motor Drive and PWM Control
PIC17C756A-33/PT is well suited to motor drive control loops where 3 dedicated PWM outputs, 4 capture inputs, and a 33 MHz CPU combine to handle commutation, current sensing, and speed feedback. The 8x8 single-cycle hardware multiplier accelerates the math required for field-oriented control or trapezoidal commutation. The 50 I/O pins accept multiple Hall sensors, encoders, and fault lines without external muxing. OTP memory suits high-volume motor products where firmware is locked at production.
Recommended
Multi-Channel Data Acquisition
PIC17C756A-33/PT supports multi-channel data acquisition systems with its 12-channel 10-bit ADC sampling analog inputs while the 33 MHz core preprocesses data before forwarding over SPI, I2C, or UART. The 902 bytes of RAM buffer sample bursts between transfers, and the 32 KB OTP stores calibration tables and linearization curves. The external memory bus allows extending storage if sample logs exceed on-chip capacity. Industrial temperature grade via -33I/PT variant handles outdoor or factory installations.
Recommended
Embedded Instrumentation with A/D Conversion
Embedded instruments such as digital panel meters, sensor transmitters, and bench-top test gear benefit from the PIC17C756A-33/PT's 10-bit ADC, 50 I/O, and multi-protocol serial interfaces. The 33 MHz core runs display refresh, key scanning, and serial output simultaneously without bottlenecks. OTP memory locks the calibration constants at production, ensuring tamper resistance. The 64-TQFP package is suited to compact handheld instrument PCBs with limited board area.
Recommended
Multi-Bus Communication Controllers
PIC17C756A-33/PT acts as a multi-bus controller bridging SPI slaves, I2C peripherals, and two UART links in gateway and protocol-converter designs. The flexible synchronous serial port supports either 3-wire SPI or 2-wire I2C master/slave, and the dual UARTs handle RS-232 or RS-485 links. With 8.25 MIPS, the CPU parses and reformats frames between buses in real time. The 5 V supply matches legacy industrial UART transceivers without level shifting.
Recommended
Legacy Industrial Control Board Replacement
PIC17C756A-33/PT remains in demand as a replacement for installed legacy boards where the OTP code is committed to production and the PCB footprint is fixed. Drop-in same-package variants (PIC17C756A-16I/PT, PIC17C756A-16E/PT) and memory-step variants (PIC17C752-33/PT) allow board-level repair without firmware rewrite. For new designs the Flash-based PIC18F family is recommended instead, but PIC17C keeps long-life industrial lines running.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C756A-33/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C756A-16I/PT | PIC17C756A-16E/PT | PIC17C752-33/PT | PIC17C752-33E/PT | PIC17C752-16E/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 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Clock Frequency | 33 MHz | 16 MHz (-52%) | 16 MHz (-52%) | 33 MHz (same) | 33 MHz (same) | 16 MHz (-52%) |
| Program Memory | 32 KB OTP | 32 KB OTP (same) | 32 KB OTP (same) | 16 KB OTP (-50%) | 16 KB OTP (-50%) | 16 KB OTP (-50%) |
| Data RAM | 902 bytes | 902 bytes (same) | 902 bytes (same) | 902 bytes (same) | 902 bytes (same) | 902 bytes (same) |
| I/O Pins | 50 | 50 (same) | 50 (same) | 50 (same) | 50 (same) | 50 (same) |
| ADC Channels | 12 x 10-bit | 12 x 10-bit (same) | 12 x 10-bit (same) | 12 x 10-bit (same) | 12 x 10-bit (same) | 12 x 10-bit (same) |
| Temperature Grade | Commercial (0C to +70C) | Industrial -40C to +85C | Extended -40C to +125C | Commercial (same) | Extended -40C to +125C | Extended -40C to +125C |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Highest throughput in PIC17C TQFP-64 family (vs PIC17C756A-16I/PT)
- Largest OTP program memory in same TQFP-64 footprint (vs PIC17C752-33/PT)
- Drop-in compatibility with extended-temperature variants (vs PIC17C756A-16E/PT)
Design Notes
PIC17C756A-33/PT requires a stable 4.5 V to 5.5 V supply with bulk decoupling (typically 10 uF tantalum) plus a 0.1 uF ceramic near each VDD/VSS pair. Because OTP parts cannot be field-updated, brown-out and power-supply glitches can permanently corrupt the locked firmware or cause undefined execution; a hardware watchdog timer or external supervisor (such as MCP130) is recommended for industrial installations.
Route the 64-TQFP (10x10 mm) land pattern with 0.5 mm pitch; use 4-layer PCB with a continuous ground plane under the IC for EMI suppression and thermal spreading. Place the 33 MHz crystal or resonator within 10 mm of OSC1/OSC2 (pins 9 and 10), and keep analog AVdd/AVss traces short and isolated from digital switching lines to keep ADC noise below 1 LSB on the 10-bit converter.
OTP program memory cannot be reprogrammed - validate firmware on a windowed or Flash-equivalent (PIC18F6520) prototype before committing to PIC17C756A-33/PT production runs. Do not assume PIC18F6520 is drop-in compatible despite Microchip's recommendation; pinout differs and the PIC18 instruction set requires firmware rewrite. Plan for end-of-life inventory if designing for production volumes exceeding distributor on-hand stock.
The 12-channel 10-bit ADC achieves best accuracy when AVdd is filtered with a 10 uH inductor and 10 uF capacitor, and VREF+ is decoupled with 0.1 uF ceramic. Avoid switching digital outputs on PORTA pins adjacent to analog inputs during ADC sampling. With 33 MHz core clock, place high-speed digital traces (PWM outputs, SPI clock) away from the AVdd/AVss pair to minimize digital-to-analog crosstalk.
Compliance Information
RoHS and REACH status not explicitly stated in the verified web data; PIC17C756A family predates strict RoHS classification. Microchip Technology reports conflict-minerals compliance on corporate level but no part-specific statement is available in the cited data.
