PIC17C756A-16I/PT - 8-bit OTP MCU, 16MHz, 32KB EPROM | Microchip
MPN: PIC17C756A-16I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.75 | $18.75 |
| 10 | $16.95 | $169.50 |
| 100 | $14.5 | $1,450.00 |
| 500 | $12.85 | $6,425.00 |
| 1,000 | $11.2 | $11,200.00 |
PIC17C756A-16I/PT Overview
An 8-bit OTP microcontroller is a single-chip computer built around an 8-bit data path and instruction set, with non-volatile program memory that is user-programmable exactly once (OTP, as opposed to flash). The PIC17C756A belongs to the broader category of microcontrollers (MCUs), which are integrated circuits containing a CPU core, RAM, ROM/EPROM/Flash, and programmable I/O. Within that hierarchy, this part is a special-purpose industrial-control MCU optimized for embedded control with on-chip ADC and PWM.
The PIC17C756A features only 58 single-word instructions, all single-cycle except for program branches and table reads/writes, which are two-cycle. The 121 ns instruction cycle (8.25 MIPS at 33 MHz clock input) is achieved through an 8-bit single-cycle hardware multiplier, accelerating arithmetic-heavy control loops. An external memory interface allows the PIC17C756A to address additional program/data memory beyond its internal 32 KB, providing migration headroom. Two USART modules, a watchdog timer, and brown-out reset support robust field deployment.
Architecturally, the PIC17C756A uses a RISC-style Harvard architecture with separate program and data buses, allowing instruction fetch and operand access to occur in the same cycle. EPROM-based program memory (rather than flash) means code is committed at the time of programming; this suits mature, fixed-function designs where the cost of flash process is not justified.
Typical applications include industrial automation controllers, motor control front-ends, sensor signal conditioning, HVAC control boards, and embedded instrumentation requiring 10-bit ADC resolution and multiple PWM channels. The 64-pin TQFP provides ample I/O for keypad scanning, LCD driving, and parallel bus expansion.
When designing with this part, verify toolchain support: MPLAB IDE with C17 or MPASM compilers is required for OTP programming. Industrial designers should also note that newer replacements such as the PIC18F6520 (flash-based) are recommended by Microchip for new designs, while the PIC17C756A remains in service for legacy and long-lifecycle programs.
This page synthesizes distributor inventory, OTP-versus-flash migration notes, and pin-compatible PIC17C family alternatives not found on a single distributor listing.
Drop-in alternatives for PIC17C756A-16I/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-16I/PT (same form factor and footprint) — differing in Package, ADC, Data Bus Width, Operating Temperature, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C756A-16E/PT
✅ Drop-In✓ In Stock
$16.8 / Unit
View Datasheet →PIC17C756A-16/PT
✅ Drop-In✓ In Stock
$11.95 / Unit
View Datasheet →PIC17C756A-33I/PT
✅ Drop-In✓ In Stock
$10.2 / Unit
View Datasheet →PIC17C752-16I/PT
✅ Drop-In✓ In Stock
$6.13 / Unit
View Datasheet →PIC17C756A-16I/PT Maximum Ratings & Electrical Characteristics
| Family | PIC17C |
| Core | 8-bit PIC RISC |
| Data Bus Width | 16 bit |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 902 bytes |
| Maximum Clock Frequency | 16 MHz |
| Instruction Cycle Time | 121 ns (at 33 MHz) |
| MIPS | 8.25 MIPS |
| Number of I/O Pins | 50 |
| ADC | 12 channels, 10-bit |
| PWM Channels | 3 |
| Capture Inputs | 4 |
| Serial Interfaces | 1x SPI/I2C, 2x USART |
| Supply Voltage | 4.5 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| Package | 64-pin TQFP (PT), 10x10 mm |
| Mounting Type | Surface Mount |
| Hardware Multiplier | 8-bit single-cycle |
| External Memory Interface | Yes |
| Number of Instructions | 58 single-word |
| RoHS Status | unknown |
PIC17C756A-16I/PT Pin Configuration
| Pin 1 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Pin 2 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Pin 3 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Pin 4 | RA3/AN3 — Port A bit 3 / Analog input 3 |
| Pin 5 | RA4/AN4 — Port A bit 4 / Analog input 4 |
| Pin 6 | RA5/AN5 — Port A bit 5 / Analog input 5 |
| Pin 7 | OSC1 — Oscillator input |
| Pin 8 | OSC2 — Oscillator output |
| Pin 9 | MCLR — Master clear / reset input |
| Pin 10 | VDD — Positive supply |
| Pin 11 | VSS — Ground |
| Pin 12 | RB0/INT — Port B bit 0 / External interrupt |
| Pin 13 | RB1 — Port B bit 1 |
| Pin 14 | RB2 — Port B bit 2 |
| Pin 15 | RB3 — Port B bit 3 |
| Pin 16 | RB4 — Port B bit 4 |
| Pin 17 | RB5 — Port B bit 5 |
| Pin 18 | RB6 — Port B bit 6 |
| Pin 19 | RB7 — Port B bit 7 |
| Pin 20 | RC0 — Port C bit 0 |
| Pin 21 | RC1 — Port C bit 1 |
| Pin 22 | RC2 — Port C bit 2 |
| Pin 23 | RC3 — Port C bit 3 |
| Pin 24 | RC4 — Port C bit 4 |
| Pin 25 | RC5 — Port C bit 5 |
| Pin 26 | RC6 — Port C bit 6 |
| Pin 27 | RC7 — Port C bit 7 |
| Pin 28 | RD0 — Port D bit 0 |
| Pin 29 | RD1 — Port D bit 1 |
| Pin 30 | RD2 — Port D bit 2 |
| Pin 31 | RD3 — Port D bit 3 |
| Pin 32 | RD4 — Port D bit 4 |
| Pin 33 | RD5 — Port D bit 5 |
| Pin 34 | RD6 — Port D bit 6 |
| Pin 35 | RD7 — Port D bit 7 |
| Pin 36 | RE0 — Port E bit 0 |
| Pin 37 | RE1 — Port E bit 1 |
| Pin 38 | RE2 — Port E bit 2 |
| Pin 39 | RE3 — Port E bit 3 |
| Pin 40 | VDD — Positive supply |
| Pin 41 | VSS — Ground |
| Pin 42 | RF0 — Port F bit 0 |
| Pin 43 | RF1 — Port F bit 1 |
| Pin 44 | RF2 — Port F bit 2 |
| Pin 45 | RF3 — Port F bit 3 |
| Pin 46 | RF4 — Port F bit 4 |
| Pin 47 | RF5 — Port F bit 5 |
| Pin 48 | RF6 — Port F bit 6 |
| Pin 49 | RF7 — Port F bit 7 |
| Pin 50 | RG0 — Port G bit 0 |
| Pin 51 | RG1 — Port G bit 1 |
| Pin 52 | RG2 — Port G bit 2 |
| Pin 53 | RG3 — Port G bit 3 |
| Pin 54 | AVDD — Analog supply |
| Pin 55 | AVSS — Analog ground |
| Pin 56 | AN6 — Analog input 6 |
| Pin 57 | AN7 — Analog input 7 |
| Pin 58 | AN8 — Analog input 8 |
| Pin 59 | AN9 — Analog input 9 |
| Pin 60 | AN10 — Analog input 10 |
| Pin 61 | AN11 — Analog input 11 |
| Pin 62 | VDD — Positive supply |
| Pin 63 | VSS — Ground |
| Pin 64 | NC — Not connected (per datasheet) |
Typical Applications
PIC17C756A-16I/PT is suitable for 6 applications: Industrial Automation Controllers, Motor Control Front-Ends, HVAC Control Boards, Embedded Instrumentation, Sensor Signal Conditioning, Legacy Replacement / Service Stocking.
Industrial Automation Controllers
The PIC17C756A-16I/PT's 12-channel 10-bit ADC and 3 PWM channels make it a strong fit for industrial control boards that read multiple analog sensors (temperature, pressure, flow) and drive motor or actuator outputs. With 50 digital I/O and 902 bytes RAM, the MCU handles keypad scanning, LCD driving, and on-board signal conditioning in a single chip. The 64-pin TQFP keeps the design footprint compact for DIN-rail mounted PLC modules.
Recommended
Motor Control Front-Ends
Three PWM outputs and four capture inputs on the PIC17C756A-16I/PT support three-phase or dual-axis motor control, with capture inputs enabling precise tachometer and encoder feedback. The 8.25 MIPS throughput (at 33 MHz grade) handles field-oriented control loops at modest PWM frequencies, while the 121 ns instruction cycle keeps ISR latency predictable. Industrial temperature grade suits factory-floor deployment.
Recommended
HVAC Control Boards
The PIC17C756A-16I/PT suits HVAC controller boards where multiple analog inputs (thermistors, pressure transducers, humidity sensors) feed 12 ADC channels and outputs drive fans, compressors, and dampers via PWMs. With 32 KB OTP program memory, complex scheduling and PID loops can be encoded once and shipped locked - the OTP model provides security against firmware reverse engineering, important for commercial HVAC systems.
Recommended
Embedded Instrumentation
The PIC17C756A-16I/PT's 12-bit ADC channels and 50 I/O support bench-top and field-portable instruments such as data loggers, environmental monitors, and process calibrators. The 902-byte RAM accommodates circular sample buffers, while 32 KB OTP holds lookup tables for sensor linearization. USART modules enable RS-232/RS-485 communication with host PCs or remote sensors.
Recommended
Sensor Signal Conditioning
Bridge sensors, RTDs, and strain gauges produce low-level analog signals that the PIC17C756A-16I/PT can digitize through its 10-bit ADC with on-chip PGA-like configuration. With 50 I/O, the MCU can multiplex multiple sensor channels, perform cold-junction compensation in firmware, and drive LCD or seven-segment displays. The OTP program memory locks calibration constants at production.
Recommended
Legacy Replacement / Service Stocking
Many OEMs continue to ship products originally designed around the PIC17C756A-16I/PT and need ongoing supply for warranty repair and field service. Keeping inventory of the -I/PT variant preserves the original bill of materials and avoids requalification. Microchip continues to support production of PIC17C parts for these long-lifecycle programs, often through factory-direct orders rather than distributor channels.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C756A-16I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C756A-16E/PT | PIC17C756A-16/PT | PIC17C756A-33I/PT | PIC17C752-16I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-pin TQFP (PT) | 64-pin TQFP (PT) - same | 64-pin TQFP (PT) - same | 64-pin TQFP (PT) - same | 64-pin TQFP (PT) - same |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 16 KB OTP |
| RAM Size | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 454 bytes |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 33 MHz | 16 MHz |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| I/O Pins | 50 | 50 | 50 | 50 | 50 |
| ADC | 12-ch, 10-bit | 12-ch, 10-bit | 12-ch, 10-bit | 12-ch, 10-bit | 12-ch, 10-bit |
| Lifecycle Status | active | active | active | active | active |
Key Differentiators
- Highest-density OTP program memory in the PIC17C TQFP family (vs PIC17C752-16I/PT)
- Industrial temperature grade with same silicon as commercial variant (vs PIC17C756A-16/PT)
- Drop-in option for higher throughput without board rework (vs PIC17C756A-16I/PT)
Design Notes
The PIC17C756A-16I/PT operates from a single 4.5-5.5 V supply; place a 100 nF decoupling capacitor close to each VDD/VSS pair (three pairs on the 64-pin TQFP) and a bulk 10 uF tantalum or ceramic on the board-level supply rail. The analog supply pins AVDD/AVSS should be bypassed separately with a 100 nF capacitor to keep ADC readings stable when digital I/O switches. Brown-out reset is enabled by configuration bits to prevent code execution at low VDD.
On the 64-pin TQFP layout, route the oscillator traces (OSC1/OSC2) as short as possible and keep them away from switching I/O lines to avoid injecting noise into the clock. If using a crystal, place the load capacitors within 5 mm of the OSC pins. The MCLR pin should have a 10 kohm pull-up to VDD; add a diode to clamp ESD if the pin is accessible externally.
Do not assume the OTP program memory is erasable - once programmed, the PIC17C756A-16I/PT cannot be rewritten. Engineers migrating from flash PIC18 parts must remember to set the configuration bits correctly before programming, because they cannot be changed in-circuit. Also note that the analog-input pins are shared with Port A and Port F; configure ADCON1 before reading analog values to avoid digital-crosstalk contamination of ADC readings.
Compliance Information
RoHS, REACH, lead-free, and halogen-free status not displayed in the retrieved Microchip product page snippets for this OTP legacy variant; verify specific date/lot code with Microchip or authorized distributor before EU-market deployment.
