PIC17C43T-25I/PQ - 8-bit 25MHz OTP MCU 8KB EPROM | Microchip
MPN: PIC17C43T-25I/PQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $22.5 | $22.50 |
| 10 | $20.25 | $202.50 |
| 100 | $18 | $1,800.00 |
| 500 | $15.75 | $7,875.00 |
| 1,000 | $13.5 | $13,500.00 |
PIC17C43T-25I/PQ Overview
An MCU (microcontroller) is a single-chip computer that combines a CPU core, program and data memory, peripherals, and I/O on one die. The PIC17C43 belongs to the 8-bit PIC family, itself part of the broader microcontroller / embedded controller / semiconductor hierarchy. Within Microchip's lineup, PIC17C5x sits above PIC16C5x and below PIC18 in capability, offering an extended instruction set with only 58 single-word instructions to learn.
Key features include a 121 ns single-cycle instruction execution (program branches and table reads/writes are two-cycle), an operating voltage range of 4.5 V to 6 V, an industrial temperature grade of -40 C to +85 C, and an 8-level hardware stack. The device provides multiple peripherals: a 16-bit timer/counter with prescaler, capture/compare/PWM modules, an 8-bit A/D converter, a USART, and a synchronous serial port (SSP) for SPI/I2C communication.
The PIC17C43 uses a RISC Harvard architecture with separate program and data paths, enabling simultaneous instruction fetch and data access. The 16-bit-wide instruction word and 8-bit data bus yield efficient code density, while the integrated watchdog timer and power-on reset improve system robustness in noisy industrial environments.
Typical applications include industrial automation controllers, motor control, automotive subsystems, consumer electronics, and embedded control where OTP programmability and 8-bit simplicity are preferred over larger flash-based MCUs. Its 33 I/O pins support direct interfacing to keypads, displays, sensors, and power switches.
When designing with this part, plan for OTP programming: the device cannot be re-flashed in-circuit, so code must be validated before commitment. An erasable CERDIP variant (JW package) exists for development. Adequate decoupling and oscillator layout are essential for the high-frequency 25 MHz operation.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC17C43T-25I/PQ — 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 PIC17C43T-25I/PQ (same form factor and footprint) — differing in Program Memory Size, Package, Mounting Type, Instruction Cycle Time, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C43T-25/PQ
✅ Drop-In✓ In Stock
$8.1 / Unit
View Datasheet →PIC17C43-16I/PQ
✅ Drop-In✓ In Stock
$4.82 / Unit
View Datasheet →PIC17C43-16E/P
✅ Drop-In✓ In Stock
$8.4 / Unit
View Datasheet →PIC17C42A-25/PT
✅ Drop-In✓ In Stock
$5.55 / Unit
View Datasheet →PIC17C43T-25E/PT
✅ Drop-In✓ In Stock
$10.65 / Unit
View Datasheet →PIC17CR43T-25I/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17C43T-25I/PQ Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Family | PIC17C |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 8 KB (4K x 16) |
| Data RAM | 454 bytes |
| Maximum Clock Frequency | 25 MHz |
| Instruction Cycle Time | 121 ns (single cycle) |
| Throughput | 8.25 MIPS |
| Supply Voltage (Vcc) | 4.5 V to 6 V |
| I/O Pins | 33 |
| Timers | 16-bit timer/counter with prescaler |
| A/D Converter | 8-bit, multi-channel |
| Communication Peripherals | USART, SSP (SPI/I2C) |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Package | 44-MQFP (PQ, 10x10 mm) |
| Mounting Type | Surface Mount |
| Instruction Set | 58 single-word instructions |
| Hardware Stack | 8-level |
| Watchdog Timer | Yes |
| RoHS Status | unknown |
PIC17C43T-25I/PQ Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input, active low |
| Pin 2 | RA0 — PORTA bit 0 (digital I/O or analog input) |
| Pin 3 | RA1 — PORTA bit 1 (digital I/O or analog input) |
| Pin 4 | RA2 — PORTA bit 2 (digital I/O or analog input) |
| Pin 5 | RA3 — PORTA bit 3 (digital I/O or analog input) |
| Pin 6 | RA4 — PORTA bit 4 (digital I/O) |
| Pin 7 | RA5 — PORTA bit 5 (digital I/O) |
| Pin 8 | RE0 — PORTE bit 0 (digital I/O or analog input) |
| Pin 9 | RE1 — PORTE bit 1 (digital I/O or analog input) |
| Pin 10 | RE2 — PORTE bit 2 (digital I/O or analog input) |
| Pin 11 | Vdd — Positive supply voltage (4.5V-6V) |
| Pin 12 | Vss — Ground |
| Pin 13 | OSC1 — Oscillator input (crystal or external clock) |
| Pin 14 | OSC2 — Oscillator output (crystal) |
| Pin 15 | RC0 — PORTC bit 0 (digital I/O or USART TX/CK) |
| Pin 16 | RC1 — PORTC bit 1 (digital I/O or USART RX/DT) |
| Pin 17 | RC2 — PORTC bit 2 (digital I/O or CCP1) |
| Pin 18 | RC3 — PORTC bit 3 (digital I/O or SSP SCL/SCLK) |
| Pin 19 | RD0 — PORTD bit 0 (digital I/O) |
| Pin 20 | RD1 — PORTD bit 1 (digital I/O) |
| Pin 21 | RD2 — PORTD bit 2 (digital I/O) |
| Pin 22 | RD3 — PORTD bit 3 (digital I/O) |
| Pin 23 | RC4 — PORTC bit 4 (digital I/O or SSP SDA/SDI) |
| Pin 24 | RC5 — PORTC bit 5 (digital I/O or SSP SDO) |
| Pin 25 | RC6 — PORTC bit 6 (digital I/O) |
| Pin 26 | RC7 — PORTC bit 7 (digital I/O) |
| Pin 27 | RD4 — PORTD bit 4 (digital I/O) |
| Pin 28 | RD5 — PORTD bit 5 (digital I/O) |
| Pin 29 | RD6 — PORTD bit 6 (digital I/O) |
| Pin 30 | RD7 — PORTD bit 7 (digital I/O) |
| Pin 31 | Vss — Ground |
| Pin 32 | Vdd — Positive supply voltage (4.5V-6V) |
| Pin 33 | RB0 — PORTB bit 0 (digital I/O with interrupt-on-change) |
| Pin 34 | RB1 — PORTB bit 1 (digital I/O with interrupt-on-change) |
| Pin 35 | RB2 — PORTB bit 2 (digital I/O with interrupt-on-change) |
| Pin 36 | RB3 — PORTB bit 3 (digital I/O with interrupt-on-change) |
| Pin 37 | RB4 — PORTB bit 4 (digital I/O with interrupt-on-change) |
| Pin 38 | RB5 — PORTB bit 5 (digital I/O with interrupt-on-change) |
| Pin 39 | RB6 — PORTB bit 6 (digital I/O with interrupt-on-change) |
| Pin 40 | RB7 — PORTB bit 7 (digital I/O with interrupt-on-change) |
| Pin 41 | NC — Not connected |
| Pin 42 | NC — Not connected |
| Pin 43 | NC — Not connected |
| Pin 44 | NC — Not connected |
Typical Applications
PIC17C43T-25I/PQ is suitable for 6 applications: Industrial Automation Controllers, Motor Control and PWM Drive, Automotive Subsystem Controllers, Consumer Electronics User Interfaces, Smart Sensor and Instrumentation Hubs, Embedded Control and Educational Platforms.
Industrial Automation Controllers
The PIC17C43T-25I/PQ suits industrial PLC and controller boards where deterministic 8-bit performance and rugged 5 V operation are required. Its 25 MHz clock yields 121 ns instruction execution for fast scan times in ladder-logic emulation, while the 33 I/O pins drive relays, opto-isolators, and indicator LEDs directly. Industrial -40 to +85 C operation tolerates factory-floor thermal stress, and 454 bytes RAM support small protocol stacks. The OTP EPROM holds verified control firmware without in-field reprogrammability risk.
Recommended
Motor Control and PWM Drive
The PIC17C43T-25I/PQ drives DC and stepper motors via its Capture/Compare/PWM (CCP) module and 16-bit timer, generating precision PWM up to 25 MHz timer tick. Its 8-bit ADC samples current and back-EMF feedback for closed-loop speed control, while 33 I/O lines connect to H-bridge drivers and encoder inputs. Industrial temperature grade and 5 V tolerance suit harsh motor enclosures. Engineers can implement trapezoidal commutation in software, leveraging the 121 ns instruction cycle for low-latency control loops.
Recommended
Automotive Subsystem Controllers
The PIC17C43T-25I/PQ powers automotive body and chassis subsystems such as lighting controllers, HVAC flaps, and accessory multiplexers, leveraging its wide 5 V tolerance and 33 digital I/O. The integrated USART and SSP support LIN-style or SPI communication with BCM/ECU masters, while the 8-bit ADC reads thermistor and position sensors. Although not AEC-Q100 qualified, the industrial temperature grade meets many interior cabin requirements. Its OTP memory locks calibration constants, preventing end-user modification.
Recommended
Consumer Electronics User Interfaces
The PIC17C43T-25I/PQ implements consumer user-interface controllers for appliances, toys, and small appliances that need 33 I/O to drive keypads, 7-segment displays, and LED indicators. The 8 KB OTP holds graphical menu logic and timing routines, and the 8-bit ADC reads touch or potentiometer inputs. Industrial temperature tolerance supports kitchen and laundry environments where heat and humidity challenge commercial-grade parts. Program memory density allows full keypad scanning plus sensor fusion in firmware.
Recommended
Smart Sensor and Instrumentation Hubs
The PIC17C43T-25I/PQ serves as a sensor hub in instrumentation, multiplexing analog inputs through its 8-bit ADC and forwarding digital data via USART or SPI to a host processor. Its 454 bytes RAM buffer sensor packets before transmission, and the 25 MHz throughput ensures responsive data acquisition at sub-millisecond intervals. The watchdog timer and brown-out reset improve field reliability for unattended sensor installations. Industrial temperature grade and 5 V operation suit process-control analog front ends.
Recommended
Embedded Control and Educational Platforms
The PIC17C43T-25I/PQ remains useful for educational and legacy embedded designs because of its simple 58-instruction set, RISC architecture, and rich peripheral documentation. With 33 I/O, an 8-bit ADC, USART, and SSP, students can learn timers, interrupts, PWM, and serial protocols on a single chip. The 8 KB OTP holds moderately-sized C or assembly projects, and the 44-MQFP package exposes all pins on standard breakout boards. Recommended PIC18F migration target: PIC18F4220 for new curricula.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C43T-25I/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C43T-25/PQ | PIC17C43-16I/PQ | PIC17C42A-25/PT | PIC17CR43T-25I/PQ |
|---|---|---|---|---|---|
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-TQFP | 44-MQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 25 MHz | 25 MHz | 16 MHz (-36%) | 25 MHz | 25 MHz |
| Program Memory | 8 KB OTP EPROM | 8 KB OTP EPROM | 8 KB OTP EPROM | 4 KB OTP EPROM (-50%) | 4K words Mask ROM |
| Temperature Grade | Industrial -40 to +85 C | Commercial 0 to +70 C | Industrial -40 to +85 C | Commercial 0 to +70 C | Industrial -40 to +85 C |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Program Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Mask ROM (factory programmed) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Higher clock speed at same package (vs PIC17C43-16I/PQ)
- Industrial temperature vs commercial (vs PIC17C43T-25/PQ)
- Reprogrammable upgrade path (vs PIC17CR43T-25I/PQ)
Design Notes
Estimated: the PIC17C43T-25I/PQ draws up to ~50 mA active at 25 MHz from a 5 V rail, plus I/O sink currents. Place a 100 nF ceramic decoupling capacitor close to each Vdd pin (pins 11 and 32 in the 44-MQFP) and a bulk 10 uF tantalum or aluminum capacitor at the regulator output. Ground returns must use a low-impedance pour connecting both Vss pins (12 and 31). Inductive loads on outputs require flyback diodes and, for relays, separate Vdd rails to prevent MCU reset from supply transients.
Place the 25 MHz crystal or resonator within 5 mm of OSC1 (pin 13) and OSC2 (pin 14) with short, equal-length traces and a ground guard ring to minimize EMI coupling. Keep high-speed digital traces away from the analog ADC inputs (PORTA/PORTE) and add a 100 nF cap on AVdd if the ADC is used. The 44-MQFP package benefits from thermal vias under the die-attach pad area to spread heat during sustained I/O switching at 25 MHz.
The PIC17C43T-25I/PQ uses OTP EPROM: code cannot be erased or rewritten in-circuit. Validate firmware on a JW-windowed CERDIP variant (PIC17C43T-25/JW) or use MPLAB simulator before committing to OTP programming. Brown-out detection and watchdog timer must be enabled in configuration bits to recover from power transients. MCLR (pin 1) requires a 10 kohm pull-up to Vdd; floating MCLR can cause spurious resets. Exceeding 6 V on Vdd permanently damages the device.
Compliance Information
RoHS, REACH, lead-free, and halogen-free status not stated in the Verified Web Data for PIC17C43T-25I/PQ; marked 'unknown' until confirmed via manufacturer documentation. Part is not AEC-Q100 qualified - automotive designs should validate or migrate to PIC18F-based parts.
