PIC17C756AT-16I/PT - 8-bit OTP MCU, 32KB EPROM, 64-TQFP | Microchip
MPN: PIC17C756AT-16I/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $19.94 | $19.94 |
| 10 | $17.5 | $175.00 |
| 100 | $14.75 | $1,475.00 |
| 500 | $12.1 | $6,050.00 |
| 1,000 | $10.25 | $10,250.00 |
PIC17C756AT-16I/PT Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, data RAM, and integrated peripherals designed for embedded control. The PIC17C family sits at the upper end of Microchip's 8-bit portfolio, targeting applications that demand higher throughput than the PIC16 family. Within the broader taxonomy, this part is an 8-bit MCU -> microcontroller -> embedded processor -> semiconductor, and uses Harvard architecture with separate program and data buses for deterministic instruction fetch.
Key features include a 16 MHz maximum clock input (33 MHz on later revisions), 58 single-word instructions for compact code, an 8 x 8 hardware multiplier executing in one instruction cycle, dual-capture/compare/PWM modules, two USART ports, an I2C/SPI peripheral, and a 12-channel 10-bit analog-to-digital converter. The Brown-out Reset and Watchdog Timer enhance reliability in industrial and automotive-grade embedded systems where supply transients and code lockups must be guarded against.
The PIC17C756AT-16I/PT uses Microchip's PIC17C RISC architecture with a 16-bit instruction word despite the 8-bit data path, balancing code density with arithmetic performance. The 'T' suffix denotes Tape & Reel packaging, the '-16' rating indicates the 16 MHz maximum clock, and the 'I' temperature grade supports -40C to +85C industrial environments. The 'PT' suffix indicates the 64-pin TQFP (10x10 mm) package.
Typical applications include industrial control panels, motor drive front-end controllers, instrumentation front-ends using the on-chip 10-bit ADC, white-goods and HVAC control boards, and embedded communication bridges where the dual USART and I2C/SPI peripherals reduce external component count. Designers transitioning from PIC16 to higher-performance 8-bit applications also use this device as a stepping stone before migrating to PIC18 or dsPIC architectures.
When designing with this part, note that the OTP memory cannot be re-programmed in-circuit; for development, use the windowed PIC17C756A UV-erasable variant or migrate to the flash-based PIC18F6520 recommended by Microchip as the modern replacement. Always keep VDD between 4.5V and 5.5V and respect the 16 MHz clock input limit to avoid timing violations.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on a single distributor or manufacturer page.
Drop-in alternatives for PIC17C756AT-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 PIC17C756AT-16I/PT (same form factor and footprint) — differing in Package, Program Memory Type, ADC, Core Architecture, Data Bus Width.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
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-33E/PT
✅ Drop-In✓ In Stock
$7.55 / Unit
View Datasheet →PIC17C756A-16E/PT
✅ Drop-In✓ In Stock
$16.8 / Unit
View Datasheet →PIC17C756AT-16I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC17C 8-bit RISC |
| Maximum Clock Frequency | 16 MHz |
| Instruction Cycle Time | 121 ns (single cycle) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 32 KB (16K x 16) |
| Data RAM | 902 bytes |
| Data EEPROM | Not present (EPROM-based MCU) |
| Data Bus Width | 8 bit |
| Instruction Word Width | 16 bit |
| I/O Pins | 50 |
| ADC | 10-bit, 12 channels |
| Supply Voltage (VDD) | 4.5 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (industrial, 'I' grade) |
| Package | 64-pin TQFP (PT) |
| Mounting Type | Surface Mount |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT, 2x USART, I2C/SPI |
| Multiplier | 8 x 8 hardware, single-cycle |
PIC17C756AT-16I/PT Pin Configuration
| Pin 1 | RC0 — I/O port C bit 0 |
| Pin 2 | RC1 — I/O port C bit 1 |
| Pin 3 | RC2 — I/O port C bit 2 |
| Pin 4 | RC3 — I/O port C bit 3 |
| Pin 5 | RC4 — I/O port C bit 4 |
| Pin 6 | RC5 — I/O port C bit 5 |
| Pin 7 | RC6 — I/O port C bit 6 |
| Pin 8 | RC7 — I/O port C bit 7 |
| Pin 9 | VSS — Ground |
| Pin 10 | VDD — Positive supply (4.5V-5.5V) |
| Pin 11 | RA0/AN0 — I/O port A bit 0 / analog input 0 |
| Pin 12 | RA1/AN1 — I/O port A bit 1 / analog input 1 |
| Pin 13 | RA2/AN2 — I/O port A bit 2 / analog input 2 |
| Pin 14 | RA3/AN3 — I/O port A bit 3 / analog input 3 |
| Pin 15 | RA4/AN4 — I/O port A bit 4 / analog input 4 |
| Pin 16 | RA5/AN5 — I/O port A bit 5 / analog input 5 |
| Pin 17 | RA6/AN6 — I/O port A bit 6 / analog input 6 |
| Pin 18 | RA7/AN7 — I/O port A bit 7 / analog input 7 |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Positive supply (4.5V-5.5V) |
| Pin 21 | RB0/INT — I/O port B bit 0 / external interrupt |
| Pin 22 | RB1 — I/O port B bit 1 |
| Pin 23 | RB2 — I/O port B bit 2 |
| Pin 24 | RB3 — I/O port B bit 3 |
| Pin 25 | RB4 — I/O port B bit 4 |
| Pin 26 | RB5 — I/O port B bit 5 |
| Pin 27 | RB6 — I/O port B bit 6 |
| Pin 28 | RB7 — I/O port B bit 7 |
| Pin 29 | VSS — Ground |
| Pin 30 | OSC1 — Crystal oscillator input |
| Pin 31 | OSC2 — Crystal oscillator output |
| Pin 32 | VDD — Positive supply (4.5V-5.5V) |
| Pin 33 | RD0 — I/O port D bit 0 |
| Pin 34 | RD1 — I/O port D bit 1 |
| Pin 35 | RD2 — I/O port D bit 2 |
| Pin 36 | RD3 — I/O port D bit 3 |
| Pin 37 | RD4 — I/O port D bit 4 |
| Pin 38 | RD5 — I/O port D bit 5 |
| Pin 39 | RD6 — I/O port D bit 6 |
| Pin 40 | RD7 — I/O port D bit 7 |
| Pin 41 | RE0 — I/O port E bit 0 |
| Pin 42 | RE1 — I/O port E bit 1 |
| Pin 43 | RE2 — I/O port E bit 2 |
| Pin 44 | RE3 — I/O port E bit 3 |
| Pin 45 | RE4 — I/O port E bit 4 |
| Pin 46 | RE5 — I/O port E bit 5 |
| Pin 47 | RE6 — I/O port E bit 6 |
| Pin 48 | RE7 — I/O port E bit 7 |
| Pin 49 | VSS — Ground |
| Pin 50 | VDD — Positive supply (4.5V-5.5V) |
| Pin 51 | TX1/RC6 — USART1 transmit (alternate function) |
| Pin 52 | RX1/RC7 — USART1 receive (alternate function) |
| Pin 53 | SCL — I2C clock |
| Pin 54 | SDA — I2C data |
| Pin 55 | SDO — SPI data out |
| Pin 56 | SDI — SPI data in |
| Pin 57 | SCK — SPI clock |
| Pin 58 | PWM1 — PWM output 1 |
| Pin 59 | PWM2 — PWM output 2 |
| Pin 60 | CCP1 — Capture/Compare/PWM 1 |
| Pin 61 | CCP2 — Capture/Compare/PWM 2 |
| Pin 62 | MCLR — Master clear reset (active low) |
| Pin 63 | VSS — Ground |
| Pin 64 | VDD — Positive supply (4.5V-5.5V) |
Typical Applications
PIC17C756AT-16I/PT is suitable for 6 applications: Industrial Control Panels, HVAC Control Boards, Motor Drive Front-End Controllers, Instrumentation Front-Ends, Embedded Communication Bridges, White Goods Control Boards.
Industrial Control Panels
The PIC17C756AT-16I/PT fits industrial control panels because of its 50 I/O pins, 12-channel 10-bit ADC, dual USART, and -40C to +85C industrial temperature grade. Engineers route panel-mounted switches, indicators, and 4-20 mA analog sensor inputs directly to the MCU without external multiplexing, and the 32 KB OTP EPROM holds the ladder-logic-equivalent firmware. At 8.25 MIPS the part handles PID loops on the 16 MHz core while the hardware PWM modules drive solid-state relays and proportional valves.
Recommended
HVAC Control Boards
The PIC17C756AT-16I/PT's 10-bit ADC aggregates multiple thermistor and pressure-sensor inputs, while its PWM outputs modulate blower and compressor drives in HVAC systems. The industrial temperature grade supports installation in unconditioned plant rooms and rooftop units. Brown-out Reset and Watchdog Timer protect the controller from brown-out and firmware lockup conditions common in motor-switching environments.
Recommended
Motor Drive Front-End Controllers
In motor drives, the PIC17C756AT-16I/PT serves as the front-end command processor, taking torque and speed references over RS-485 (USART) and generating PWM command signals for a downstream power-stage controller. The 8 x 8 single-cycle hardware multiplier accelerates vector-control math, and the 16 MHz core sustains 8.25 MIPS with headroom for sensor debouncing. Dual capture/compare/PWM modules align phase currents to the inverter cycle.
Recommended
Instrumentation Front-Ends
Test and measurement instruments use the PIC17C756AT-16I/PT as a front-end digitizer and controller, leveraging the 12-channel 10-bit ADC for slow-scan data acquisition and the I2C/SPI peripherals for LCD and EEPROM interfaces. The 902-byte RAM buffers scan frames before pushing them to a host PC over USART. Industrial temperature grade ensures reliable operation in laboratory and field-deployed instruments.
Recommended
Embedded Communication Bridges
The PIC17C756AT-16I/PT is well suited to protocol-bridging tasks where a device must translate between RS-232, RS-485, and I2C/SPI networks. Dual USART ports handle two asynchronous buses simultaneously while the SPI port services a sensor cluster. At 8.25 MIPS the part can sustain byte-rate buffering without dropping characters, and the 50 I/O lines drive status LEDs and DIP switches for address configuration.
Recommended
White Goods Control Boards
White goods such as washing machines and dishwashers use the PIC17C756AT-16I/PT as the appliance controller. The OTP EPROM holds the appliance firmware (no field upgrades required), the 10-bit ADC reads water level and temperature sensors, and the PWM channels drive motor and valve actuators. Brown-out Reset protects against line-voltage transients common in domestic appliance installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C756AT-16I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C756AT-16/PT | PIC17C756A-16I/PT | PIC17C756A-33E/PT | PIC17C756A-16E/PT |
|---|---|---|---|---|---|
| Package | TQFP-64 (PT) | TQFP-64 (PT) | TQFP-64 (PT) | TQFP-64 (PT) | TQFP-64 (PT) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 32 KB OTP EPROM | 32 KB OTP EPROM | 32 KB OTP EPROM | 32 KB OTP EPROM | 32 KB OTP EPROM |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 33 MHz | 16 MHz |
| RAM | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes |
| Temperature Grade | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Extended -40C to +125C | Extended -40C to +125C |
| Packaging Form | Tape & Reel | Tray | Tray | Tray | Tray |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
Key Differentiators
- Tape & Reel packaging for high-volume SMT assembly (vs PIC17C756A-16I/PT)
- Industrial -40C to +85C temperature grade (vs PIC17C756AT-16/PT)
- 32 KB OTP EPROM, 50 I/O, 12-channel ADC in TQFP-64 (vs PIC17C752-16I/PT)
Design Notes
The PIC17C756AT-16I/PT requires a stable 4.5V to 5.5V supply; recommended decoupling is a 10uF bulk tantalum at the board VDD entry plus a 100 nF ceramic within 5 mm of each VDD pin. The part has multiple VDD/VSS pairs on the TQFP-64 footprint; connecting every pair independently minimises digital switching noise on the analog ADC reference rail. Brown-out Reset must be enabled in the configuration word for industrial environments where the 5V rail may sag during motor inrush.
OTP memory cannot be re-programmed; a programming failure (e.g., interrupted during the high-voltage VPP pulse on the MCLR pin) permanently bricks the device. For development, always use the UV-erasable ceramic-windowed PIC17C756A-16I/P variant (PLCC package with window) to iterate firmware before committing to OTP. Always verify the configuration word before final programming; an accidentally-disabled watchdog or wrong oscillator mode causes immediate firmware hang.
At 16 MHz with all peripherals active, the PIC17C756AT-16I/PT draws roughly 50 mA from the 5V supply (250 mW). The TQFP-64 package has a theta_JA near 50 C/W on a 2-layer JEDEC test board, giving a 12.5 C/W rise above ambient. The industrial -40C to +85C rating leaves comfortable margin at room temperature; for sealed enclosures consider derating to 70 C ambient to protect the OTP memory and reduce long-term retention risk.
Compliance Information
RoHS, REACH, lead-free and halogen-free status were not provided in the verified web data; marked [DATA_NEEDED]. The 'I' suffix indicates industrial temperature grade, not automotive AEC-Q100 qualification.
