PIC17C756A-33E/PT - 8-Bit 33MHz OTP MCU, 32KB, 64-TQFP | Microchip
MPN: PIC17C756A-33E/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.84 | $11.84 |
| 10 | $10.66 | $106.60 |
| 100 | $9.45 | $945.00 |
| 500 | $8.42 | $4,210.00 |
| 1,000 | $7.55 | $7,550.00 |
PIC17C756A-33E/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripheral interfaces. The PIC17C family sits between Microchip's PIC16C mid-range line and PIC18C enhanced line, offering the PIC RISC instruction set extended to 16-bit program words and 58 single-word instructions for higher code density and faster context switching.
Key features include four capture inputs, three PWM outputs, an external memory bus, a 12-channel 10-bit Analog-to-Digital converter, and a synchronous serial port configurable as either 3-wire SPI or 2-wire I2C, plus two UART channels. The "E" suffix denotes the extended industrial temperature range of -40C to +125C, making this part suitable for harsh-environment and automotive-adjacent applications.
The PIC17C756A uses a Harvard bus architecture with separate program and data paths. The 16-bit-wide OTP program memory delivers 121 ns instruction cycle time at 33 MHz, and the device supports prioritized interrupts, a hardware multiplier, and an 8-level deep hardware stack. Two 8-bit timer/counters plus one 16-bit timer/counter, plus a watchdog timer, give the part rich timing resources for motor control and instrumentation.
Typical applications include industrial automation controllers, motor control front-ends, consumer-electronics user-interface boards, sensor signal conditioning, and embedded data-acquisition front-ends. The 12-channel 10-bit ADC suits multi-sensor scanning, while the PWM/capture channels simplify closed-loop control loops.
When designing with the PIC17C756A-33E/PT, note that OTP memory cannot be reprogrammed in-circuit - the part is intended for high-volume mature production. For prototype or low-volume work, choose the PIC18F-series or PIC17C flash variants. Because the PIC17C family is mature and being phased out by Microchip in favor of PIC18F, expect NRND/EOL notices when planning long-life programs.
This page synthesizes distributor stock and pricing data, same-family PIC17C drop-in alternatives, and practical design notes beyond what the manufacturer datasheet alone provides, helping engineers quickly assess whether the PIC17C756A-33E/PT fits their design.
Drop-in alternatives for PIC17C756A-33E/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-33E/PT (same form factor and footprint) — differing in Data Bus Width, Package, ADC, Operating Temperature, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C756A-33I/PT
✅ Drop-In✓ In Stock
$10.2 / Unit
View Datasheet →PIC17C756A-33/PT
✅ Drop-In✓ In Stock
$4.35 / Unit
View Datasheet →PIC17C756AT-33I/PT
✅ Drop-In✓ In Stock
$9.15 / 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 →PIC18F6520-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17C756A-33E/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard, 16-bit instruction word) |
| Family | PIC17C |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM | 902 bytes |
| Maximum CPU Frequency | 33 MHz |
| Performance | 8.25 MIPS (121 ns instruction cycle) |
| Instruction Set Size | 58 single-word instructions |
| I/O Pins | 50 |
| ADC | 12 channels x 10-bit |
| PWM Channels | 3 |
| Capture Inputs | 4 |
| Timers | Two 8-bit + one 16-bit + WDT |
| Serial Interfaces | 1x SPI/I2C (SSP), 2x UART (AUSART) |
| External Memory Bus | Yes (extended PIC16 bus) |
| Supply Voltage (Vdd) | 4.5 V to 5.5 V |
| Operating Temperature Range | -40 C to +125 C (E suffix) |
| Package | 64-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC17C756A-33E/PT Pin Configuration
| Pin 1 | MCLR/VPP — Master clear reset (active low) / programming voltage input |
| Pin 2 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Pin 4 | RA2/AN2 — Port A bit 2 / analog input 2 |
| Pin 5 | RA3/AN3/VREF- — Port A bit 3 / analog input 3 / ADC VREF- |
| Pin 6 | RA4/AN4/T0CKI — Port A bit 4 / analog input 4 / Timer 0 clock |
| Pin 7 | RA5/AN5/SS — Port A bit 5 / analog input 5 / SPI slave select |
| Pin 8 | RA6/AN6 — Port A bit 6 / analog input 6 |
| Pin 9 | RA7/AN7 — Port A bit 7 / analog input 7 |
| Pin 10 | AVDD — Analog supply voltage (5V) |
| Pin 11 | AVSS — Analog ground |
| Pin 12 | OSC1/CLKIN — Oscillator crystal input / external clock |
| Pin 13 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Pin 14 | T1OSO/T1CKI — Timer 1 oscillator output / clock input |
| Pin 15 | T1OSI/RC0 — Timer 1 oscillator input / Port C bit 0 |
| Pin 16 | RC1 — Port C bit 1 |
| Pin 17 | RC2 — Port C bit 2 |
| Pin 18 | RC3 — Port C bit 3 |
| Pin 19 | RC4 — Port C bit 4 |
| Pin 20 | RC5 — Port C bit 5 |
| Pin 21 | RC6 — Port C bit 6 |
| Pin 22 | RC7 — Port C bit 7 |
| Pin 23 | RD0 — Port D bit 0 |
| Pin 24 | RD1 — Port D bit 1 |
| Pin 25 | RD2 — Port D bit 2 |
| Pin 26 | RD3 — Port D bit 3 |
| Pin 27 | RD4 — Port D bit 4 |
| Pin 28 | RD5 — Port D bit 5 |
| Pin 29 | RD6 — Port D bit 6 |
| Pin 30 | RD7 — Port D bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Digital supply voltage (5V) |
| Pin 33 | RE0/RD — Port E bit 0 / external memory read strobe |
| Pin 34 | RE1/WR — Port E bit 1 / external memory write strobe |
| Pin 35 | RE2/CS — Port E bit 2 / external memory chip select |
| Pin 36 | RE3 — Port E bit 3 |
| Pin 37 | RE4 — Port E bit 4 |
| Pin 38 | RE5 — Port E bit 5 |
| Pin 39 | RE6 — Port E bit 6 |
| Pin 40 | RE7 — Port E bit 7 |
| Pin 41 | RF0/AN8 — Port F bit 0 / analog input 8 |
| Pin 42 | RF1/AN9 — Port F bit 1 / analog input 9 |
| Pin 43 | RF2/AN10 — Port F bit 2 / analog input 10 |
| Pin 44 | RF3/AN11 — Port F bit 3 / analog input 11 |
| Pin 45 | RF4 — Port F bit 4 |
| Pin 46 | RF5 — Port F bit 5 |
| Pin 47 | RF6 — Port F bit 6 |
| Pin 48 | RF7 — Port F bit 7 |
| Pin 49 | RG0 — Port G bit 0 |
| Pin 50 | RG1 — Port G bit 1 |
| Pin 51 | RG2 — Port G bit 2 |
| Pin 52 | RG3 — Port G bit 3 |
| Pin 53 | RG4 — Port G bit 4 |
| Pin 54 | RG5 — Port G bit 5 |
| Pin 55 | RG6 — Port G bit 6 |
| Pin 56 | RG7 — Port G bit 7 |
| Pin 57 | RH0 — Port H bit 0 |
| Pin 58 | RH1 — Port H bit 1 |
| Pin 59 | RH2 — Port H bit 2 |
| Pin 60 | RH3 — Port H bit 3 |
| Pin 61 | RH4 — Port H bit 4 |
| Pin 62 | RH5 — Port H bit 5 |
| Pin 63 | RH6 — Port H bit 6 |
| Pin 64 | RH7 — Port H bit 7 |
Typical Applications
PIC17C756A-33E/PT is suitable for 6 applications: Industrial Motor Control, Data Acquisition Front-End, Automotive Subsystem Controller, Consumer Appliance Control Board, Security and Access Control Panel, Industrial Sensor Interface Module.
Industrial Motor Control
The PIC17C756A-33E/PT suits industrial motor-control front-ends because its 33 MHz core runs the 8.25 MIPS RISC engine needed for fast PID loops, while three PWM channels drive three-phase inverter MOSFETs and four capture inputs measure Hall-sensor or back-EMF timing with sub-microsecond resolution. The 12-channel 10-bit ADC scans motor current, bus voltage, and temperature sensors every 30 microseconds at full throughput, allowing field-oriented control of brushless DC and AC induction motors. The -40 C to +125 C extended temperature range lets the same firmware serve under-hood automotive blower pumps or factory-floor servo drives without a heatsink.
Recommended
Data Acquisition Front-End
The PIC17C756A-33E/PT works well as a multi-channel data-acquisition front-end, with 12 single-ended 10-bit ADC inputs sampled at the chip's internal RC rate and stored in the 902-byte RAM buffer for UART or SPI transmission to a host. The 33 MHz MIPS throughput allows on-chip scaling, averaging, and threshold detection without offloading to a DSP, while the SSP port pushes processed telemetry to an isolated RS-485 link at 1 Mbps. Extended-temperature operation lets the same firmware live in unattended outdoor sensor cabinets, and the 50 I/O pins drive status LEDs, relays, and an LCD character display from a single chip.
Recommended
Automotive Subsystem Controller
The PIC17C756A-33E/PT - with its -40 C to +125 C extended operating range - is suited to non-safety automotive subsystems such as HVAC blend-door actuators, instrument cluster secondary displays, and aftermarket body-control modules. The AUSART channels drive LIN or K-Line diagnostic interfaces, while the PWM outputs trim motor speeds and the capture inputs read quadrature encoders. With 32 KB OTP code space the firmware can host a full CAN-style state machine in software without a dedicated protocol IC, although the part is NRND and new automotive programs should target PIC18F or dsPIC33 families.
Recommended
Consumer Appliance Control Board
Consumer appliance mainboards - washing machines, dishwashers, microwave ovens, and induction cooktops - use the PIC17C756A-33E/PT to consolidate user inputs, sensor scanning, and actuator drive on a single 5 V MCU. The 50 I/O pins drive seven-segment or LCD displays, accept keypad matrices, and switch triac-controlled loads through opto-isolated drivers. Its OTP program memory suits high-volume production runs once firmware is finalized, with the 33 MHz core handling real-time keypad debounce, temperature PID, and buzzer tone generation simultaneously.
Recommended
Security and Access Control Panel
Security alarm panels and access-control terminals benefit from the PIC17C756A-33E/PT's combination of 50 I/O, on-chip ADC for zone supervision, and dual UARTs for keypad and central-station modems. The PIC RISC core handles multi-zone scanning, tamper detection, and event buffering in 902 bytes of RAM, while the SSP port drives an I2C RTC and EEPROM for time-stamped event logging. The extended-temperature version tolerates unheated garages or outdoor cabinets, and OTP memory prevents firmware tampering or external reprogramming attacks.
Recommended
Industrial Sensor Interface Module
Industrial 4-20 mA loop-powered sensor heads and bridge-signal conditioners use the PIC17C756A-33E/PT as the local controller because it integrates 12 ADC channels for multi-axis bridge excitation readout, 4 capture inputs for frequency or pulse counting from flowmeters, and PWM outputs for excitation trim. The 33 MHz MIPS engine runs calibration math and linearization tables in firmware, while the SSP port uploads compensated readings over SPI to a gateway MCU. Extended-temperature operation supports process plants, and OTP locking secures the proprietary calibration firmware.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C756A-33E/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C756A-33I/PT | PIC17C756A-33/PT | PIC17C756A-16I/PT | PIC18F6520-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same |
| Maximum CPU Frequency | 33 MHz | 33 MHz | 33 MHz | 16 MHz | 40 MHz |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB Flash (re-programmable) |
| Temperature Range | -40C to +125C (E suffix) | -40C to +85C | 0C to +70C | -40C to +85C | -40C to +85C |
| RAM | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 2048 bytes |
| ADC Channels | 12 x 10-bit | 12 x 10-bit | 12 x 10-bit | 12 x 10-bit | 12 x 10-bit (with more analog features) |
| Memory Type | OTP (one-time programmable) | OTP | OTP | OTP | Flash (in-circuit re-programmable) |
| Lifecycle Status | NRND | NRND | NRND | NRND | Active (recommended migration) |
Key Differentiators
- Extended -40C to +125C industrial temperature range (vs PIC17C756A-33/PT)
- 33 MHz core delivers 8.25 MIPS throughput (vs PIC17C756A-16I/PT)
- Drop-in 64-TQFP package compatibility with PIC18F migration path (vs PIC18F6520-I/PT)
- PIC17C 16-bit instruction bus with 58-instruction RISC set (vs PIC16F877A-I/PT)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD/VSS pair (pins 11/10, 31/32, and the analog AVDD/AVSS pair on pins 10/11). Add a bulk 10 uF tantalum or low-ESR ceramic at the regulator output. The PIC17C756A core draws approximately 15 mA at 33 MHz, plus peripheral I/O current, so budget the regulator at 50 mA minimum. The analog supply (AVDD/AVSS) must be tied to VDD/VSS with a ferrite bead if the ADC is used in noisy switching environments.
The 64-TQFP package has theta_JA around 45 C/W on a standard 4-layer JEDEC test board. At the maximum 33 MHz clock with all peripherals active and 50 I/O toggling, internal dissipation is approximately 200-300 mW, yielding a junction temperature rise of 9-14 C above ambient - well within the -40 C to +125 C operating range. For continuous operation at +125 C ambient, ensure the PCB copper pour under the exposed pad area (TQFP-64 has no exposed pad but large copper lands help) is at least 1 square inch for thermal spreading.
Keep the OSC1/OSC2 crystal traces under 10 mm and guard them with a ground pour to minimize EMI pickup that could disrupt ADC sampling. Place the MCLR pull-up resistor (typically 10 kOhm) close to pin 1 and add the recommended 100 nF MCLR decoupling. The external memory bus pins (RE0/RD, RE1/WR, RE2/CS on pins 33-35) require matched-length traces if you connect external SRAM/EPROM; otherwise leave them as general-purpose I/O to avoid bus contention at startup.
OTP memory cannot be re-programmed - once you commit code to the PIC17C756A-33E/PT, there is no field upgrade path. For development, use the PIC17C756A-33/JW windowed ceramic package variant or migrate firmware to PIC18F6520 first, then port to OTP only at production release. Also note the part is NRND; obtain a firm PCN/lifecycle commitment from Microchip before committing to a multi-year production program, or plan redesign to PIC18F6520 as the official Microchip migration path.
Route the 12 ADC analog inputs away from PWM outputs and switching power lines to prevent switching-noise coupling into ADC samples. The ADC reference voltage (AVDD) should be bypassed with a 10 uF tantalum plus 100 nF ceramic at the AVDD pin (pin 10). If using the external VREF+ input (RA3/AN3 on pin 5), drive it from a low-impedance source such as a REF02 or MCP1525 buffer to maintain ADC absolute accuracy over temperature.
Compliance Information
ROHS3 compliant per mcu-supplier.com listing. Not AEC-Q100 qualified - not recommended for safety-critical automotive applications; suitable for industrial and consumer designs.
