PIC17C756AT-33/PT - 8-bit 33MHz OTP MCU, 32KB | Microchip
MPN: PIC17C756AT-33/PT ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.7832 | $4.78 |
| 10 | $4.31 | $43.10 |
| 100 | $3.85 | $385.00 |
| 500 | $3.42 | $1,710.00 |
| 1,000 | $3.05 | $3,050.00 |
PIC17C756AT-33/PT Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and peripheral interfaces. The PIC17C series sits above the PIC16C family in Microchip's 8-bit hierarchy, offering higher instruction throughput (8.25 MIPS at 33 MHz), a wider 16-bit program memory data bus, and extended peripherals while maintaining upward compatibility with PIC16C5X, PIC12CXXX, and PIC16CXX code. OTP (One-Time Programmable) EPROM technology is suited for volume production where the firmware is finalized but does not need field re-programmability.
Key features include the 33 MHz clock input, single-cycle hardware multiplier, 121 ns instruction execution (excluding branches and table reads/writes which take two cycles), Brown-out Detect/Reset, Power-on Reset, Watchdog Timer, PWM, plus serial interfaces (I2C, SPI, USART) and a 10-bit ADC. According to the verified Microchip product page, the part operates from a single 4.5 V to 5.5 V supply and provides 50 general-purpose I/O pins.
The PIC17C756A architecture uses a RISC-style Harvard CPU with a 16-bit program memory bus and 8-bit data path, an 8-level hardware stack, and interrupt logic supporting 12 sources. The wide external memory bus and 10-bit ADC make it suitable for mixed-signal embedded control.
Typical applications include industrial motor control, building automation, instrumentation front-ends, and embedded control requiring moderate code density with 32 KB of OTP and 50 I/O lines. It is also used in legacy designs where Microchip recommends migrating to PIC18F6520 for new designs.
When designing with this device, ensure the 4.5-5.5 V supply is well-decoupled and that oscillator layout guidelines are followed because the 33 MHz clock leaves little timing margin. Microchip recommends PIC18F6520 as a modern, flash-based successor.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that consolidate information not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC17C756AT-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 PIC17C756AT-33/PT (same form factor and footprint) — differing in Data Bus Width, Program Memory Type, ADC, Core Architecture, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C756AT-33I/PT
✅ Drop-In✓ In Stock
$9.15 / Unit
View Datasheet →PIC17C756AT-16/PT
✅ Drop-In✓ In Stock
$11.95 / 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 →PIC17C756A-33E/PT
✅ Drop-In✓ In Stock
$7.55 / Unit
View Datasheet →PIC17C756AT-33/PT Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-bit |
| Core Series | PIC17C |
| Clock Speed (max) | 33 MHz |
| Instruction Cycle Time | 121 ns (single-cycle) |
| Throughput | 8.25 MIPS |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 902 x 8 bytes |
| Data Bus Width | 16-bit (program) / 8-bit (data) |
| Number of I/O Pins | 50 |
| ADC | 10-bit A/D converter |
| Supply Voltage (Vdd) | 4.5 V to 5.5 V |
| Package | 64-pin TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
PIC17C756AT-33/PT Pin Configuration
| Pin 1 | OSC1 — Oscillator input |
| Pin 2 | OSC2 — Oscillator output |
| Pin 3 | MCLR — Master clear reset input |
| Pin 4 | RA0 — PORTA I/O / analog input |
| Pin 5 | RA1 — PORTA I/O / analog input |
| Pin 6 | RA2 — PORTA I/O / analog input |
| Pin 7 | RA3 — PORTA I/O / analog input |
| Pin 8 | RA4 — PORTA I/O / analog input |
| Pin 9 | RA5 — PORTA I/O / analog input |
| Pin 10 | RA6 — PORTA I/O / analog input |
| Pin 11 | RA7 — PORTA I/O / analog input |
| Pin 12 | VSS — Ground |
| Pin 13 | VDD — Positive supply |
| Pin 14 | RB0 — PORTB I/O / interrupt |
| Pin 15 | RB1 — PORTB I/O |
| Pin 16 | RB2 — PORTB I/O |
| Pin 17 | RB3 — PORTB I/O |
| Pin 18 | RB4 — PORTB I/O |
| Pin 19 | RB5 — PORTB I/O |
| Pin 20 | RB6 — PORTB I/O / ICSP clock |
| Pin 21 | RB7 — PORTB I/O / ICSP data |
| Pin 22 | RC0 — PORTC I/O |
| Pin 23 | RC1 — PORTC I/O |
| Pin 24 | RC2 — PORTC I/O |
| Pin 25 | RC3 — PORTC I/O / SCL |
| Pin 26 | RC4 — PORTC I/O / SDA |
| Pin 27 | RC5 — PORTC I/O |
| Pin 28 | RC6 — PORTC I/O / TX |
| Pin 29 | RC7 — PORTC I/O / RX |
| Pin 30 | VSS — Ground |
| Pin 31 | VDD — Positive supply |
| Pin 32 | RD0 — PORTD I/O |
| Pin 33 | RD1 — PORTD I/O |
| Pin 34 | RD2 — PORTD I/O |
| Pin 35 | RD3 — PORTD I/O |
| Pin 36 | RD4 — PORTD I/O |
| Pin 37 | RD5 — PORTD I/O |
| Pin 38 | RD6 — PORTD I/O |
| Pin 39 | RD7 — PORTD I/O |
| Pin 40 | RE0 — PORTE I/O |
| Pin 41 | RE1 — PORTE I/O |
| Pin 42 | RE2 — PORTE I/O |
| Pin 43 | RE3 — PORTE I/O |
| Pin 44 | RE4 — PORTE I/O |
| Pin 45 | RE5 — PORTE I/O |
| Pin 46 | RE6 — PORTE I/O |
| Pin 47 | RE7 — PORTE I/O |
| Pin 48 | VSS — Ground |
| Pin 49 | VDD — Positive supply |
| Pin 50 | RF0 — PORTF I/O / analog |
| Pin 51 | RF1 — PORTF I/O / analog |
| Pin 52 | RF2 — PORTF I/O / analog |
| Pin 53 | RF3 — PORTF I/O / analog |
| Pin 54 | RF4 — PORTF I/O / analog |
| Pin 55 | RF5 — PORTF I/O / analog |
| Pin 56 | RF6 — PORTF I/O / analog |
| Pin 57 | RF7 — PORTF I/O / analog |
| Pin 58 | RG0 — PORTG I/O |
| Pin 59 | RG1 — PORTG I/O |
| Pin 60 | RG2 — PORTG I/O |
| Pin 61 | RG3 — PORTG I/O |
| Pin 62 | RG4 — PORTG I/O |
| Pin 63 | RG5 — PORTG I/O |
| Pin 64 | VSS — Ground |
Typical Applications
PIC17C756AT-33/PT is suitable for 6 applications: Industrial Motor Control, Building Automation Controllers, Instrumentation Front-Ends, Embedded Control Legacy Replacement, POS Terminals and Printers, Security and Access Control Panels.
Industrial Motor Control
The PIC17C756AT-33/PT's 33 MHz clock and 8.25 MIPS throughput give it enough headroom for sensorless and sensored BLDC motor commutation loops that require sub-100 us cycle times. Its on-chip PWM modules, 10-bit ADC, and 50 I/O pins support three-phase inverter control with current sensing, fault inputs, and quadrature encoder feedback on a single MCU. Engineers pair it with IR2101 gate drivers and ACS712 current sensors; the wide 4.5-5.5 V supply tolerates 24 V industrial bus rails after regulation. OTP memory is acceptable for fixed-function industrial controllers where firmware is locked at production.
Recommended
Building Automation Controllers
HVAC and lighting controllers benefit from the PIC17C756AT-33/PT's 50 I/O pins, which can directly drive multiple relay banks, keypad matrices, and triac optocouplers without external I/O expanders. The 33 MHz instruction rate handles Modbus and BACnet protocol stacks over UART while leaving cycles for scheduling logic. Brown-out Detect and Watchdog Timer provide robust operation in noisy building electrical environments. The 32 KB OTP program memory fits typical building automation firmware with comfortable headroom for future feature additions.
Recommended
Instrumentation Front-Ends
The PIC17C756AT-33/PT's 10-bit ADC and 33 MHz throughput make it suitable for low-speed instrumentation such as digital panel meters, bench multimeters, and process signal conditioners. The wide 16-bit program memory bus simplifies lookup-table calibration of sensor nonlinearity, while 902 bytes of RAM hold measurement buffers and display refresh data. Combined with a 4.5-5.5 V supply and external precision references like REF02, designers can achieve 0.1% FS accuracy for industrial process signals without a separate analog processor.
Recommended
Embedded Control Legacy Replacement
The PIC17C756AT-33/PT serves as a long-term replacement for installed-base industrial controllers where original firmware is locked in OTP and cannot be reflashed. With Microchip's last-time-buy notice recommending PIC18F6520, current users can stock PIC17C756AT-33/PT inventory to maintain spare-part availability for years of field service. Pin compatibility with PIC17C756AT-33I/PT (industrial temp) and PIC17C756A-33E/PT (extended temp) simplifies cross-grade spares planning across commercial, industrial, and extended-temperature deployments.
Recommended
POS Terminals and Printers
The PIC17C756AT-33/PT's UART, SPI, and I2C connectivity supports connection to thermal printer heads, keypads, and cash-drawer solenoids in point-of-sale terminals. Its 33 MHz clock encodes receipts and handles bitmap font rendering in real time without external coprocessors. The 50 I/O pins interface with LCD character displays, barcode scanner LEDs, and magnetic-stripe readers; the 32 KB OTP holds multi-language firmware tables. Brown-out and Watchdog Timer features keep unattended kiosks running reliably across power disturbances.
Recommended
Security and Access Control Panels
Access control panels with multi-door supervision benefit from the PIC17C756AT-33/PT's 50 I/O pins to read Wiegand card readers, supervise door strikes, and drive piezo buzzers for alarms. The 10-bit ADC can monitor backup battery voltage for low-battery alerts, and the on-chip UART links to central monitoring stations. OTP memory prevents field tampering with firmware, a security advantage over flash MCUs. Industrial temperature parts (PIC17C756AT-33I/PT) are preferred for outdoor or unconditioned security enclosures.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C756AT-33/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C756AT-33I/PT | PIC17C756AT-16/PT | PIC17C756A-16I/PT | PIC17C756A-16E/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 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Clock Speed | 33 MHz | 33 MHz | 16 MHz | 16 MHz | 16 MHz | 33 MHz |
| Program Memory | 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 |
| Temperature Grade | Commercial (0C to +70C) | Industrial (-40C to +85C) | Commercial | Industrial | Extended | Extended |
| Packaging Format | Tape & Reel | Tape & Reel | Tube | Tube | Tube | Tube |
| Number of I/O | 50 | 50 | 50 | 50 | 50 | 50 |
| Lifecycle Status | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy |
Key Differentiators
- Highest throughput in PIC17C family (vs PIC17C756AT-16/PT)
- Tape & Reel packaging for high-volume assembly (vs PIC17C756A-33E/PT)
- True drop-in with no firmware change required (vs PIC18F6520)
Design Notes
The PIC17C756AT-33/PT operates from a single 4.5 V to 5.5 V supply. Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD/VSS pair on the package (typically pins 13, 31, 49 are VDD; pins 12, 30, 48, 64 are VSS). Add a 10 uF bulk tantalum or ceramic capacitor at the board's supply input. The 33 MHz oscillator creates high-frequency switching noise that can corrupt ADC readings if supply impedance is high.
Route the 33 MHz crystal or oscillator traces (OSC1/OSC2, pins 1-2) on the top layer with a guard ground pour on the opposite side and keep trace lengths under 10 mm. Avoid routing digital signals directly under the crystal traces to prevent capacitive coupling. Place the MCLR pull-up (typically 10 kohm) close to the MCLR pin (pin 3). For TQFP-64 layout, use 0.5 mm pitch traces with 0.2 mm/0.2 mm width/spacing to clear the leads.
Do not exceed 5.5 V on any VDD pin - the PIC17C756AT-33/PT has no internal voltage regulator and is sensitive to overvoltage on supply rails. Configure unused I/O pins as outputs (not inputs) to avoid floating-pin supply current. Brown-out Detect must be enabled in configuration bits for reliable operation across power transients. For OTP programming, ensure the EPROM programming voltage timing per the datasheet is followed exactly or the device may lock out further programming attempts.
Compliance Information
RoHS and lead-free status not explicitly stated in verified distributor data; Microchip PIC17C family is OTP EPROM-based and predates widespread RoHS conversion. Conflict minerals compliance per Microchip corporate statement.
