PIC17C756A-33/L - 33MHz 8-Bit OTP MCU, 32KB, 50 I/O | Microchip
MPN: PIC17C756A-33/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $16.54 | $16.54 |
| 10 | $14.88 | $148.80 |
| 100 | $12.95 | $1,295.00 |
| 500 | $10.85 | $5,425.00 |
| 1,000 | $9.45 | $9,450.00 |
PIC17C756A-33/L Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + RAM), and programmable peripherals onto one silicon die. The PIC17C family sits within the legacy OTP-ROM 8-bit MCU tier of Microchip's product tree: MCU -> 8-bit microcontroller -> PIC -> PIC17C -> high-performance segment. Unlike flash-based PIC18F successors, PIC17C devices use EPROM/OTP program memory, which makes them suited for mature, low-cost, moderate-volume embedded products where firmware is finalized at production.
Key features include 58 single-word instructions for compact code, an 8 x 8 single-cycle hardware multiplier, brown-out reset, a watchdog timer, and an extended instruction set. Supply voltage is 4.5 V to 5.5 V (5 V nominal), and the OTP program memory allows one-time factory or prototyping programming. The 68-pin PLCC J-leaded package offers socket-upgradeable serviceability for industrial and legacy systems.
Typical applications include industrial control panels, motor control nodes, instrumentation front-ends, and embedded control boards that were originally designed around the PIC17C platform. When designing in this part, note that PIC17C756A is a mature OTP device; new designs should evaluate PIC18F6520 or PIC18F8720 as flash-based drop-in or near-drop-in successors per Microchip migration guidance.
Drop-in alternatives for PIC17C756A-33/L — 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/L (same form factor and footprint) — differing in Core Architecture, Mounting Type, Program Memory Type, Package, Maximum Clock Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesPIC17C756A-33/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC17C (8-bit RISC) |
| Program Memory Type | OTP (One-Time Programmable EPROM) |
| Program Memory Size | 32 KB (16K x 16) |
| Data RAM | 902 bytes |
| Maximum Clock Frequency | 33 MHz |
| Instruction Cycle | 121 ns (8.25 MIPS) |
| Instruction Set Size | 58 single-word instructions |
| Hardware Multiplier | 8 x 8 single-cycle |
| I/O Pins | 50 |
| ADC | 12 channels x 10-bit |
| PWM Outputs | 3 |
| Capture Inputs | 4 |
| Timers | Multiple 8/16-bit timers |
| Serial Interfaces | 1x SPI / I2C (SSP) + 2x USART |
| Supply Voltage | 4.5 V to 5.5 V |
| Package | 68-pin PLCC (24.23 x 24.23 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | 0C to +70C (commercial) |
PIC17C756A-33/L 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/VREF+ — PORTA bit 3 / analog input 3 / VREF+ |
| 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/CLKIN — Oscillator input / external clock |
| Pin 10 | OSC2/CLKOUT — Oscillator output / clock out |
| Pin 11 | VSS — Ground |
| Pin 12 | RC0 — PORTC bit 0 |
| Pin 13 | RC1 — PORTC bit 1 |
| Pin 14 | RC2 — PORTC bit 2 |
| Pin 15 | RC3 — PORTC bit 3 |
| Pin 16 | RC4 — PORTC bit 4 |
| Pin 17 | RC5 — PORTC bit 5 |
| Pin 18 | RC6 — PORTC bit 6 |
| Pin 19 | RC7 — PORTC bit 7 |
| Pin 20 | VDD — Positive supply |
| Pin 21 | VSS — Ground |
| Pin 22 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 23 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 24 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pin 25 | RB3/INT3 — PORTB bit 3 / external interrupt 3 |
| Pin 26 | RB4 — PORTB bit 4 |
| Pin 27 | RB5 — PORTB bit 5 |
| Pin 28 | RB6 — PORTB bit 6 |
| Pin 29 | RB7 — PORTB bit 7 |
| Pin 30 | VSS — Ground |
| Pin 31 | VDD — Positive supply |
| Pin 32 | [DATA_NEEDED: pin 32 name] — [DATA_NEEDED: pin 32 function - datasheet p.30262A] |
| Pin 33 | [DATA_NEEDED: pin 33 name] — [DATA_NEEDED: pin 33 function - datasheet p.30262A] |
| Pin 34 | [DATA_NEEDED: pin 34 name] — [DATA_NEEDED: pin 34 function - datasheet p.30262A] |
| Pin 35 | [DATA_NEEDED: pin 35 name] — [DATA_NEEDED: pin 35 function - datasheet p.30262A] |
| Pin 36 | [DATA_NEEDED: pin 36 name] — [DATA_NEEDED: pin 36 function - datasheet p.30262A] |
| Pin 37 | [DATA_NEEDED: pin 37 name] — [DATA_NEEDED: pin 37 function - datasheet p.30262A] |
| Pin 38 | [DATA_NEEDED: pin 38 name] — [DATA_NEEDED: pin 38 function - datasheet p.30262A] |
| Pin 39 | [DATA_NEEDED: pin 39 name] — [DATA_NEEDED: pin 39 function - datasheet p.30262A] |
| Pin 40 | [DATA_NEEDED: pin 40 name] — [DATA_NEEDED: pin 40 function - datasheet p.30262A] |
| Pin 41 | [DATA_NEEDED: pin 41 name] — [DATA_NEEDED: pin 41 function - datasheet p.30262A] |
| Pin 42 | [DATA_NEEDED: pin 42 name] — [DATA_NEEDED: pin 42 function - datasheet p.30262A] |
| Pin 43 | [DATA_NEEDED: pin 43 name] — [DATA_NEEDED: pin 43 function - datasheet p.30262A] |
| Pin 44 | [DATA_NEEDED: pin 44 name] — [DATA_NEEDED: pin 44 function - datasheet p.30262A] |
| Pin 45 | [DATA_NEEDED: pin 45 name] — [DATA_NEEDED: pin 45 function - datasheet p.30262A] |
| Pin 46 | [DATA_NEEDED: pin 46 name] — [DATA_NEEDED: pin 46 function - datasheet p.30262A] |
| Pin 47 | [DATA_NEEDED: pin 47 name] — [DATA_NEEDED: pin 47 function - datasheet p.30262A] |
| Pin 48 | [DATA_NEEDED: pin 48 name] — [DATA_NEEDED: pin 48 function - datasheet p.30262A] |
| Pin 49 | [DATA_NEEDED: pin 49 name] — [DATA_NEEDED: pin 49 function - datasheet p.30262A] |
| Pin 50 | [DATA_NEEDED: pin 50 name] — [DATA_NEEDED: pin 50 function - datasheet p.30262A] |
| Pin 51 | [DATA_NEEDED: pin 51 name] — [DATA_NEEDED: pin 51 function - datasheet p.30262A] |
| Pin 52 | [DATA_NEEDED: pin 52 name] — [DATA_NEEDED: pin 52 function - datasheet p.30262A] |
| Pin 53 | [DATA_NEEDED: pin 53 name] — [DATA_NEEDED: pin 53 function - datasheet p.30262A] |
| Pin 54 | [DATA_NEEDED: pin 54 name] — [DATA_NEEDED: pin 54 function - datasheet p.30262A] |
| Pin 55 | [DATA_NEEDED: pin 55 name] — [DATA_NEEDED: pin 55 function - datasheet p.30262A] |
| Pin 56 | [DATA_NEEDED: pin 56 name] — [DATA_NEEDED: pin 56 function - datasheet p.30262A] |
| Pin 57 | [DATA_NEEDED: pin 57 name] — [DATA_NEEDED: pin 57 function - datasheet p.30262A] |
| Pin 58 | [DATA_NEEDED: pin 58 name] — [DATA_NEEDED: pin 58 function - datasheet p.30262A] |
| Pin 59 | [DATA_NEEDED: pin 59 name] — [DATA_NEEDED: pin 59 function - datasheet p.30262A] |
| Pin 60 | [DATA_NEEDED: pin 60 name] — [DATA_NEEDED: pin 60 function - datasheet p.30262A] |
| Pin 61 | [DATA_NEEDED: pin 61 name] — [DATA_NEEDED: pin 61 function - datasheet p.30262A] |
| Pin 62 | [DATA_NEEDED: pin 62 name] — [DATA_NEEDED: pin 62 function - datasheet p.30262A] |
| Pin 63 | [DATA_NEEDED: pin 63 name] — [DATA_NEEDED: pin 63 function - datasheet p.30262A] |
| Pin 64 | [DATA_NEEDED: pin 64 name] — [DATA_NEEDED: pin 64 function - datasheet p.30262A] |
| Pin 65 | [DATA_NEEDED: pin 65 name] — [DATA_NEEDED: pin 65 function - datasheet p.30262A] |
| Pin 66 | [DATA_NEEDED: pin 66 name] — [DATA_NEEDED: pin 66 function - datasheet p.30262A] |
| Pin 67 | [DATA_NEEDED: pin 67 name] — [DATA_NEEDED: pin 67 function - datasheet p.30262A] |
| Pin 68 | [DATA_NEEDED: pin 68 name] — [DATA_NEEDED: pin 68 function - datasheet p.30262A] |
Typical Applications
PIC17C756A-33/L is suitable for 6 applications: Industrial Control Panels, Motor Control Nodes, Instrumentation Front-Ends, Legacy Embedded Control Boards, Building Automation Controllers, Point-of-Sale Terminals.
Industrial Control Panels
The PIC17C756A-33/L fits industrial control panel designs where deterministic 8-bit processing, 50 I/O lines, and 12-channel 10-bit ADC are required for sensor aggregation and actuator control. Its 33 MHz clock delivers 8.25 MIPS, which is sufficient for sequential scanning of multiple analog inputs, debounced keypads, and PWM-driven motor or valve drivers. The 50 I/O directly drive 7-segment displays, optocouplers, and discrete indicators without external logic. The 902-byte RAM holds state machines for PLC ladder emulation, while the 32 KB OTP program memory accommodates fixed ladder-logic firmware at production programming. Compared with flash MCUs, the OTP cost advantage is meaningful for high-volume panel builds.
Recommended
Motor Control Nodes
Motor control nodes benefit from the PIC17C756A-33/L's three PWM outputs and four capture inputs, which together support closed-loop DC motor or stepper control at the 33 MHz instruction rate. The 121 ns instruction cycle allows the firmware to execute PID loops at sub-millisecond periods while simultaneously sampling the 12-channel ADC for back-EMF, current, and temperature feedback. The 50 I/O lines interface to H-bridge drivers, optical encoders, and end-stop switches. Compared with newer dsPIC alternatives, this part remains preferred when cost dominates and the firmware is finalized - the OTP memory enforces a one-time-only programming model that suits mature motor-control products.
Recommended
Instrumentation Front-Ends
Instrumentation front-ends rely on the PIC17C756A-33/L's 12-channel 10-bit ADC for digitizing thermocouple, strain-gauge, or process-voltage signals, while the 8.25 MIPS throughput handles linearization and averaging in real time. The 50 I/O lines interface to LCD character displays, keypad matrices, and RS-232/485 transceivers via the two onboard USARTs. The synchronous serial port configurable as SPI or I2C talks to external EEPROM, RTC, or sensor front-end chips. Compared with newer 12-bit ADC parts, the 10-bit resolution here is sufficient for many legacy instrumentation products where the firmware is locked into the OTP.
Recommended
Legacy Embedded Control Boards
Legacy embedded control boards originally designed around the PIC17C platform benefit from the PIC17C756A-33/L because it preserves the same 68-pin PLCC footprint, instruction set, and peripheral register map as older PIC17C752/756 silicon. This means maintenance and warranty-replacement production can continue without PCB rework. The 33 MHz speed grade matches original timing budgets, while the 32 KB OTP memory holds the same legacy firmware binaries. Compared with migrating to PIC18F, which requires firmware recompilation and timing re-validation, the PIC17C756A-33/L is the lowest-risk lifecycle-extension option for installed bases running into the late 2020s.
Recommended
Building Automation Controllers
Building automation controllers use the PIC17C756A-33/L to aggregate sensor inputs (temperature, humidity, occupancy) via the 12-channel ADC and drive HVAC actuators via the three PWM channels. The 50 I/O handle relay outputs, status LEDs, and isolated digital inputs from BACnet or Modbus links through the USARTs. The 8.25 MIPS throughput runs scheduling logic, while the 902-byte RAM holds scheduling tables and override flags. Compared with low-power PIC16LF parts, this PIC17C variant trades sleep-mode efficiency for raw throughput, which suits line-powered building controllers that are always on.
Recommended
Point-of-Sale Terminals
Point-of-sale terminals use the PIC17C756A-33/L as a peripheral controller for keypad scanning, printer stepper control via PWM, and barcode-wand interface through the USART. The 50 I/O drive the LCD character display, status LEDs, and the cash-drawer pulse output. The 32 KB OTP memory holds fixed firmware for terminal models that do not require field updates. The 12-channel ADC is available for battery monitoring on portable terminals. Compared with newer ARM Cortex-M0 POS controllers, this 8-bit MCU remains useful in mature terminal designs where firmware stability and cost dominate upgrade decisions.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C756A-33/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C756A-33I/L | PIC17C756AT-33/L | PIC17C756AT-33I/L | PIC17C756A-16I/L |
|---|---|---|---|---|---|
| Package | 68-pin PLCC | 68-pin PLCC | 68-pin PLCC | 68-pin PLCC | 68-pin PLCC |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 33 MHz | 33 MHz | 33 MHz | 33 MHz | 16 MHz |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP |
| Data RAM | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| I/O Pins | 50 | 50 | 50 | 50 | 50 |
| ADC Channels x Resolution | 12 x 10-bit | 12 x 10-bit | 12 x 10-bit | 12 x 10-bit | 12 x 10-bit |
| 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 |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND |
Key Differentiators
- Highest speed grade of the PIC17C756A OTP family (vs PIC17C756A-16I/L)
- Commercial temperature grade at lowest cost tier (vs PIC17C756A-33I/L)
- Same 68-pin PLCC footprint across speed and temperature variants (vs PIC17C756A-33/P)
Design Notes
The PIC17C756A-33/L operates from a single 4.5 V to 5.5 V supply. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of each VDD pin (the part has multiple VDD pins: 20, 31 and others). Bulk decoupling of 10 uF tantalum or aluminum on the supply rail reduces switching transients from the 50 I/O lines. Brown-out reset is internal; tie MCLR through a 10 kohm pull-up to VDD to avoid spurious resets. Estimated: total quiescent current is approximately 5-15 mA at 33 MHz depending on peripheral activity.
The 68-pin PLCC socket allows field replacement and programming socket adapters. For new designs, prefer through-hole PLCC sockets rated for at least 100 insertion cycles. Keep analog traces (AN0-AN11, VREF) short and away from digital switching lines to preserve ADC accuracy at 10-bit resolution. Place the 33 MHz crystal or resonator close to OSC1/OSC2 with grounded guard traces to reduce EMI. Estimated: 33 MHz fundamental-mode crystal with 22 pF load capacitors is the typical reference circuit.
OTP memory cannot be erased or rewritten - any code bug in production becomes a hardware rework. Use a PIC18F or PIC17C development socket for firmware validation before committing to OTP programming. The -33 speed grade designation is mandatory: do not substitute -16 or -25 speed grades in designs that require 33 MHz timing budgets, because instruction execution is halved. When migrating to PIC18F6520, verify peripheral register map differences - USART, ADC, and PWM control bits differ between PIC17C and PIC18F silicon. Watch for stack overflow if nested interrupts exceed the hardware stack depth of 16 levels on PIC17C756A.
Compliance Information
Compliance data not present in verified web data; datasheet 30262A does not contain an explicit compliance table in retrieved snippets. RoHS/REACH/lead-free status was not returned by DigiKey or Mouser product pages in the search results.
