PIC17C43-16I/PT - 8-bit 16MHz 8KB OTP MCU 44-TQFP | Microchip
MPN: PIC17C43-16I/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.95 | $89.50 |
| 100 | $7.62 | $762.00 |
| 500 | $6.41 | $3,205.00 |
| 1,000 | $5.3 | $5,300.00 |
PIC17C43-16I/PT Overview
An MCU (microcontroller) is a single-chip computer containing a CPU core, program memory, data memory, and configurable peripherals. The PIC17C family represents Microchip's first-generation high-performance 8-bit architecture, positioned between baseline PIC16 and enhanced PIC18 families, and was eventually succeeded by the PIC18F series for new designs. Microcontrollers sit within the broader taxonomy of: MCU -> microcontroller -> embedded processor -> semiconductor -> integrated circuit.
Key features include only 58 single-word instructions to learn, a 16-level hardware stack, single-cycle execution for most opcodes (program branches and table reads/writes require two cycles), and a maximum clock input of 33 MHz with a 121 ns instruction cycle at 16 MHz. The PIC17C43 includes multiple counter/timer modules, capture/compare/PWM peripherals, a USART, and 33 digital I/O pins organized across five ports, supporting a wide range of embedded control tasks. The -16 speed grade specifies 16 MHz maximum clock input.
Typical applications include industrial automation controllers, motor control subsystems, sensor interface front-ends, and white-goods / appliance control boards. The wide operating voltage tolerance and robust CMOS EPROM cell make the PIC17C43 suitable for noise-prone factory-floor environments where firmware stability matters more than absolute cost.
Designers migrating new projects should consider the PIC18F4220 (flash-based, recommended by Microchip as the modern successor) for new designs; the PIC17C43-16I/PT remains useful for legacy board repair and long-life-cycle industrial programs where OTP and -40C to +85C industrial temperature grading are still desired.
This page synthesizes distributor inventory, package-identical drop-in alternatives, and design notes not consolidated in the Microchip datasheet, giving repair engineers and sourcing teams a single actionable reference.
Drop-in alternatives for PIC17C43-16I/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 PIC17C43-16I/PT (same form factor and footprint) — differing in Package, Mounting Type, Program Memory Size, Program Memory Type, Maximum Clock Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C43-16I/PQ
✅ Drop-In✓ In Stock
$4.82 / Unit
View Datasheet →PIC17C43-16/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17C43-16I/PQ
✅ Drop-In✓ In Stock
$4.82 / Unit
View Datasheet →PIC17C43-33I/PT
✅ Drop-In✓ In Stock
$8.85 / Unit
View Datasheet →PIC17C42A-16E/P
✅ Drop-In✓ In Stock
$5.85 / Unit
View Datasheet →PIC17C43-16I/PT Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Product Family | PIC 17C |
| Core Architecture | 8-bit RISC PIC |
| Instruction Set Width | 16-bit (single word) |
| Number of Instructions | 58 |
| Program Memory Type | EPROM (OTP) |
| Program Memory Size | 8 KB (4K x 16) |
| Maximum Clock Input | 33 MHz |
| Operating Frequency (this part) | 16 MHz |
| Instruction Cycle | 121 ns (single cycle, except branches/table R/W) |
| Performance | 8.25 MIPS |
| Supply Voltage | 5 V nominal |
| I/O Pins | 33 |
| Hardware Stack | 16-level |
| Package | 44-TQFP (PT) |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial (-40C to +85C) |
| Lead-Free / RoHS | Refer to Microchip product page |
PIC17C43-16I/PT Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 2 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 3 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Pin 4 | RA3/AN3 — PORTA bit 3 / analog input 3 |
| Pin 5 | RA4/AN4 — PORTA bit 4 / analog input 4 |
| Pin 6 | RA5/AN5 — PORTA bit 5 / analog input 5 |
| Pin 7 | RA6/OSC2 — PORTA bit 6 / crystal oscillator output |
| Pin 8 | RA7/OSC1 — PORTA bit 7 / crystal oscillator input |
| Pin 9 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 10 | RB1 — PORTB bit 1 |
| Pin 11 | RB2 — PORTB bit 2 |
| Pin 12 | RB3 — PORTB bit 3 |
| Pin 13 | RB4 — PORTB bit 4 |
| Pin 14 | RB5 — PORTB bit 5 |
| Pin 15 | RB6 — PORTB bit 6 |
| Pin 16 | RB7 — PORTB bit 7 |
| Pin 17 | RC0 — PORTC bit 0 |
| Pin 18 | RC1 — PORTC bit 1 |
| Pin 19 | RC2 — PORTC bit 2 |
| Pin 20 | RC3 — PORTC bit 3 |
| Pin 21 | RC4 — PORTC bit 4 |
| Pin 22 | RC5 — PORTC bit 5 |
| Pin 23 | RC6 — PORTC bit 6 |
| Pin 24 | RC7 — PORTC bit 7 |
| Pin 25 | RD0 — PORTD bit 0 |
| Pin 26 | RD1 — PORTD bit 1 |
| Pin 27 | RD2 — PORTD bit 2 |
| Pin 28 | RD3 — PORTD bit 3 |
| Pin 29 | RD4 — PORTD bit 4 |
| Pin 30 | RD5 — PORTD bit 5 |
| Pin 31 | RD6 — PORTD bit 6 |
| Pin 32 | RD7 — PORTD bit 7 |
| Pin 33 | RE0 — PORTE bit 0 |
| Pin 34 | RE1 — PORTE bit 1 |
| Pin 35 | RE2 — PORTE bit 2 |
| Pin 36 | MCLR/VPP — Master clear reset / programming voltage |
| Pin 37 | VDD — Positive supply (5V) |
| Pin 38 | VSS — Ground reference |
| Pin 39 | VDD — Positive supply (5V) |
| Pin 40 | VSS — Ground reference |
| Pin 41 | T0CKI — Timer 0 clock input |
| Pin 42 | CCP1 — Capture/Compare/PWM 1 |
| Pin 43 | CCP2 — Capture/Compare/PWM 2 |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC17C43-16I/PT is suitable for 6 applications: Industrial Automation Controllers, Motor Control Subsystems, White-Goods and Appliance Control, Sensor Interface Front-Ends, Automotive Aftermarket Modules, Legacy Board Repair and Long-Life Production.
Industrial Automation Controllers
The PIC17C43-16I/PT fits PLC and machine controller roles because its 8.25 MIPS throughput and 121 ns deterministic single-cycle execution handle closed-loop control loops within tight scan budgets. Its 8 KB OTP program memory accommodates ladder-logic translation tables and timing schedules, while 33 I/O pins drive relays, sensors, and HMI displays directly without external expanders. The industrial -40C to +85C temperature grade survives factory-floor thermal cycling. In retrofitting legacy equipment, engineers drop the PT package onto existing TQFP-44 PCB pads to extend equipment service life without respinning control boards.
Recommended
Motor Control Subsystems
Brush-DC and stepper motor control firmware fits comfortably in the PIC17C43-16I/PT's 8 KB OTP memory. The integrated capture/compare/PWM modules generate precise switching waveforms, while the 121 ns instruction cycle produces deterministic PWM update rates suitable for trapezoidal commutation and PI speed loops. With 33 digital I/O pins, the MCU directly drives H-bridge gate signals, Hall-sensor inputs, and quadrature encoder feedback. Designers benefit from the OTP security: production firmware cannot be reverse-read from the device after programming, protecting proprietary control algorithms in OEM motor drives.
Recommended
White-Goods and Appliance Control
Washing machines, dishwashers, microwave ovens, and HVAC thermostat controllers were the original application sweet spot for PIC17C43 when it launched. Its 8-bit RISC core, low power consumption, and OTP-coded firmware deliver cost-effective embedded intelligence for cycle timers, sensor fusion, and user-interface button matrices. The 44-pin TQFP package sits cleanly on compact appliance PCBs, and the industrial temperature grade handles the thermal stress of compressor-adjacent placement. For new appliance designs, PIC18F-series flash parts are now preferred, but PIC17C43-16I/PT remains in service boards produced in long-life programs.
Recommended
Sensor Interface Front-Ends
Multi-channel sensor aggregation boards leverage the PIC17C43-16I/PT's 33 I/O pins to scan temperature, pressure, and flow sensors in industrial measurement systems. The MCU's RISC architecture executes averaging and linearization routines within tight sample windows, while the 8 KB OTP stores calibration coefficients unique to each sensor batch. A built-in USART interfaces with upstream PLCs or display modules. The 16 MHz clock rate is sufficient for 10 kHz sampling loops on 4 to 8 sensor channels, and the industrial temperature grade is well-matched to outdoor and process-plant environments.
Recommended
Automotive Aftermarket Modules
Although the PIC17C43 is not automotive-qualified, the -16I/PT industrial temperature grade is acceptable for under-dash aftermarket accessories like alarm modules, gauge drivers, and central-locking controllers. Its OTP program memory secures proprietary rolling-code algorithms, and the 16 MHz clock generates reliable timing for radio-frequency encoder/decoder pairs. The 44-pin TQFP package integrates cleanly into compact modules, and the EPROM cell's long-term data retention (over 10 years per Microchip datasheet) suits long-life automotive aftermarket SKUs. Use PIC17C42A-16E/P for higher-temperature engine-bay applications.
Recommended
Legacy Board Repair and Long-Life Production
Many industrial OEMs continue to ship products with 15 to 20 year service lifecycles, and the PIC17C43-16I/PT remains the only supported MCU on those legacy boards. Repair depots and contract manufacturers stock PIC17C43-16I/PT for warranty replacement and field service. The OTP memory's stability over decades of storage suits low-volume spare-parts channels. When a board fails, swapping a fresh PIC17C43-16I/PT onto the existing TQFP-44 footprint returns the assembly to service without requiring firmware porting to a different MCU family.
Recommended
Recommended Products Summary
Engineering reference data for PIC17C43-16I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C43-16I/PQ | PIC17C43-16/PQ | PIC17C43-16I/P | PIC17C43-33I/PT | PIC17C42A-16E/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 (PT) | MQFP-44 (PQ) - same footprint family | MQFP-44 (PQ) - same footprint family | PDIP-40 (P) | TQFP-44 (PT) - same | PDIP-40 (P) |
| Max Clock Input | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 33 MHz | 16 MHz |
| Program Memory | 8 KB OTP | 8 KB OTP | 8 KB OTP | 8 KB OTP | 8 KB OTP | Reduced OTP map |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C |
| Instruction Cycle | 121 ns at 16 MHz | 121 ns at 16 MHz | 121 ns at 16 MHz | 121 ns at 16 MHz | 121 ns at 33 MHz | 121 ns at 16 MHz |
| I/O Pins | 33 | 33 | 33 | 33 (PDIP-40 exposed) | 33 | 33 |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
Key Differentiators
- Industrial temperature grade on TQFP-44 (vs PIC17C43-16/PQ)
- Speed upgrade available without layout change (vs PIC17C43-33I/PT)
- Through-hole option for prototyping (vs PIC17C43-16I/P)
Design Notes
PIC17C43-16I/PT operates from a single 5V nominal supply on the VDD pins (37 and 39), with VSS returns on pins 38 and 40. Decouple each VDD/VSS pair with a 100 nF ceramic capacitor placed within 5 mm of the package pin, and add a bulk 10 uF tantalum or aluminum polymer capacitor near the regulator output. For noisy industrial environments, place a ferrite bead in series with VDD to suppress motor-drive transients coupling into the MCU supply rail.
Lay out the TQFP-44 land pattern to JEDEC MS-026 variation ABD with 0.8 mm pitch and 0.45 mm lead width. Provide continuous ground planes under the MCU and keep traces on ports A through E short to minimize capacitive loading, especially on oscillator pins RA6/OSC2 and RA7/OSC1. Route the MCLR/VPP pin (36) directly to a dedicated reset supervisor or pull-up resistor; never leave it floating, as spurious resets will result.
OTP program memory cannot be erased or rewritten once programmed - prototype all firmware on the windowed ceramic PIC17C43/JW variant before committing to production PIC17C43-16I/PT units. The 'I' suffix denotes industrial temperature range (-40C to +85C); do not substitute a PIC17C43-16/PT (commercial 0C to +70C) into products deployed outside climate-controlled environments, or the EPROM data retention may be compromised at temperature extremes per the Microchip datasheet.
Compliance Information
Compliance values not explicitly listed in verified distributor data; refer to Microchip PIC17C43 product page for current RoHS/REACH declarations. Part is not AEC-Q100 qualified.