PIC17LC43-08I/P - 8KB OTP 8-bit MCU, 33 I/O, DIP-40 | Microchip
MPN: PIC17LC43-08I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $9.2 | $92.00 |
| 100 | $8.45 | $845.00 |
| 500 | $7.7 | $3,850.00 |
| 1,000 | $7.05 | $7,050.00 |
PIC17LC43-08I/P Overview
An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, program memory, data memory, and I/O peripherals on a single silicon die, optimized for low-cost embedded control. The PIC17 family specifically targets high-performance 8-bit designs, sitting architecturally between the simpler PIC16 mid-range devices and the more capable PIC18 line. PIC17C/PIC17LC parts use a RISC Harvard architecture with 58 single-word instructions where nearly every instruction completes in one instruction cycle, a major advantage over CISC 8-bit alternatives.
Key features of the PIC17LC43-08I/P include 16-bit-wide data bus architecture, a 33 MHz maximum clock input (the "/08" speed grade limits operation to 8 MHz / 33 MHz crystal domain), an external oscillator input, an integrated 16-bit timer/counter chain, capture/compare/PWM peripherals, an analog comparator, and a USART. The wide 2.5 V to 5.5 V supply range supports both 3.3 V and 5 V system rails, while the OTP program memory allows last-minute code changes without mask-tooling lead times.
Typical applications span industrial motor control, HVAC actuator drivers, automotive body electronics (non-safety), appliance control boards, and instrumentation front-ends. The 33 I/O lines and interrupt-driven peripheral set make the part efficient for sensor reading, keypad scanning, LCD driving, and serial protocol bridging.
When designing with this device, place a 0.1 microfarad ceramic decoupling capacitor close to the VDD pin, ensure the oscillator load capacitors match the crystal specification, and budget OTP programming time for production runs. Compared to PIC18F upgrade parts, the PIC17LC43 trades Flash for OTP and costs less in volume.
This page synthesizes distributor pricing, drop-in DIP-40 alternatives, and practical layout notes compiled from the Microchip datasheet, FindIC, Mouser, Lisleapex, and Xecor listings.
Drop-in alternatives for PIC17LC43-08I/P — 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 PIC17LC43-08I/P (same form factor and footprint) — differing in Package, Data Bus Width, Mounting Type, Program Memory Size, Maximum Clock Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17C43-16I/PQ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.82 / Unit
View Datasheet →PIC17LC43-08/PT
✅ Drop-In✓ In Stock
$6.2 / Unit
View Datasheet →PIC17C43-16I/PQ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.82 / Unit
View Datasheet →PIC17C44-16I/PQ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$15.5 / Unit
View Datasheet →PIC17LC43-08I/P Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit RISC (PIC17 Harvard) |
| Instruction Set Width | 16-bit instructions |
| Number of Instructions | 58 single-word instructions |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 8 KB |
| Data RAM | 454 bytes |
| Data Bus Width | 16-bit (external) |
| Maximum Clock Frequency | 33 MHz |
| Operating Clock (this grade) | 8 MHz nominal ("-08") |
| Instruction Cycle | 121 ns (single cycle) |
| Supply Voltage Range | 2.5 V to 5 V |
| I/O Pins | 33 |
| Timers | Multiple 16-bit timer/counters |
| Communication Peripherals | USART |
| Analog Peripherals | Comparator |
| Package | CDIP-40 (DIP-40, 0.600 inch, plastic) |
| Mounting Type | Through-Hole |
| Operating Temperature Grade | Industrial (-40C to +85C) |
PIC17LC43-08I/P Pin Configuration
| Pin 1 | RA0/AN0 — Port A bit 0 / analog input |
| Pin 2 | RA1/AN1 — Port A bit 1 / analog input |
| Pin 3 | RA2/AN2 — Port A bit 2 / analog input |
| Pin 4 | RA3/AN3 — Port A bit 3 / analog input |
| Pin 5 | RA4/AN4 — Port A bit 4 / analog input |
| Pin 6 | RA5/AN5 — Port A bit 5 / analog input |
| Pin 7 | RA6 — Port A bit 6 |
| Pin 8 | RA7 — Port A bit 7 |
| Pin 9 | OSC1 — Oscillator input |
| Pin 10 | OSC2 — Oscillator output |
| Pin 11 | RB0/INT — Port B bit 0 / external interrupt |
| Pin 12 | RB1 — Port B bit 1 |
| Pin 13 | RB2 — Port B bit 2 |
| Pin 14 | RB3 — Port B bit 3 |
| Pin 15 | RB4 — Port B bit 4 |
| Pin 16 | RB5 — Port B bit 5 |
| Pin 17 | RB6 — Port B bit 6 |
| Pin 18 | RB7 — Port B bit 7 |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply (2.5-5 V) |
| Pin 21 | RC0 — Port C bit 0 |
| Pin 22 | RC1 — Port C bit 1 |
| Pin 23 | RC2 — Port C bit 2 |
| Pin 24 | RC3 — Port C bit 3 |
| Pin 25 | RC4 — Port C bit 4 |
| Pin 26 | RC5 — Port C bit 5 |
| Pin 27 | RC6 — Port C bit 6 |
| Pin 28 | RC7 — Port C bit 7 |
| Pin 29 | RD0 — Port D bit 0 |
| Pin 30 | RD1 — Port D bit 1 |
| Pin 31 | RD2 — Port D bit 2 |
| Pin 32 | RD3 — Port D bit 3 |
| Pin 33 | RD4 — Port D bit 4 |
| Pin 34 | RD5 — Port D bit 5 |
| Pin 35 | RD6 — Port D bit 6 |
| Pin 36 | RD7 — Port D bit 7 |
| Pin 37 | RE0 — Port E bit 0 |
| Pin 38 | RE1 — Port E bit 1 |
| Pin 39 | MCLR — Master clear reset (active low) |
| Pin 40 | NC — Not connected (per datasheet) |
Typical Applications
PIC17LC43-08I/P is suitable for 6 applications: Industrial Motor Control, HVAC Actuator Drivers, Automotive Body Electronics (Non-Safety), Appliance Control Boards, Instrumentation Front-Ends, Serial Protocol Bridges.
Industrial Motor Control
The PIC17LC43-08I/P suits small industrial motor control boards thanks to its 33 I/O lines, integrated 16-bit timer/counter chain for PWM generation, and 2.5-5 V supply flexibility for 3.3 V drive electronics. The 121 ns single-cycle instruction throughput at 33 MHz provides fast interrupt response for closed-loop PID updates without requiring a DSP. Compared to PIC16 alternatives, the wider 16-bit data bus speeds up 16-bit timer reads for accurate tachometer feedback, while the 454-byte RAM accommodates 8-channel sampled state buffers. Most importantly, the OTP EPROM program memory lets OEMs lock the control algorithm into the chip at production time, preventing field IP theft in motor-drive firmware.
Recommended
HVAC Actuator Drivers
Heating, ventilation, and air-conditioning (HVAC) actuator boards benefit from the PIC17LC43's 33 I/O capability to multiplex multiple damper motor windings, read temperature sensors via the analog comparator, and drive TRIAC gates through PWM outputs in a single MCU. The wide 2.5-5 V operating range accepts both legacy 5 V damper controllers and modern 3.3 V sensor rails without a second regulator. The 8 KB OTP program memory is sized for typical HVAC control firmware including PID loops, fault logging, and Modbus or simple serial communication. Compared to PIC18F Flash parts, the OTP model reduces per-unit cost in high-volume damper production runs.
Recommended
Automotive Body Electronics (Non-Safety)
The PIC17LC43-08I/P fits non-safety automotive body modules such as seat controllers, mirror adjusters, interior lighting, and accessory multiplexers where its industrial temperature grade (-40C to +85C) handles under-dash thermal environments. The 16-bit timer/counter chain drives body-control PWMs for headlamp leveling and LED dimming, while the integrated USART bridges to CAN transceivers via a side-car protocol stack. Its 8 KB OTP capacity suits typical body-controller firmware with fixed calibration tables. Designers should confirm AEC-Q100 status with Microchip (the LC variant is industrial-grade, not automotive-qualified), and select the PIC18F K-series for true safety-critical modules.
Recommended
Appliance Control Boards
White-goods appliance controllers such as washing machines, dishwashers, and microwave ovens adopt the PIC17LC43-08I/P for its combination of 33 I/O lines (enough to drive segment LCDs, button matrices, and relay banks) and 8 KB OTP program memory (sufficient for cycle state machines and safety interlocks). The 2.5-5 V supply range supports universal motor 5 V rails as well as lower-power standby designs. Compared to PIC16F877 designs, the PIC17 architecture gives faster interrupt response for sensorless motor commutation. The OTP EPROM also deters after-market firmware swaps, an important concern in warranty management for major appliances.
Recommended
Instrumentation Front-Ends
Low-speed instrumentation such as laboratory data loggers, panel meters, and bench-top multimeters benefit from the PIC17LC43's deterministic 121 ns instruction cycle for tight timing of ADC polling and display refresh. The 454-byte RAM is sufficient for circular sample buffers and BCD-conversion scratch space, while the 33 I/O drive multiplexed LCD or LED bar-graph readouts directly. Unlike a PIC18F USB-capable part, the PIC17LC43 relies on its USART for external data dump to a PC. Engineers should budget the 8 KB OTP code space carefully; instrumentation menus and linearization tables can consume a large fraction of the array.
Recommended
Serial Protocol Bridges
The PIC17LC43-08I/P excels as a low-cost serial bridge between legacy RS-232 peripherals and modern serial buses thanks to its integrated USART and 33 I/O for hand-shake lines. With 454 bytes RAM it can buffer frames for protocol translation (e.g. RS-232 to RS-485, or async serial to SPI sensor networks). The 121 ns cycle time keeps up with 115200 bps streams comfortably. The OTP EPROM variant locks the bridge firmware to prevent accidental field re-flashing in industrial retrofit installs. Designers can daisy-chain multiple bridges using the MCLR pin as a synchronised reset input across a backplane.
Recommended
Recommended Products Summary
Engineering reference data for PIC17LC43-08I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17C43-16I/P | PIC17LC43-08/PT | PIC17C44-16I/PQ |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | DIP-40 (CDIP-40) | DIP-40 - same | DIP-40 - same | DIP-40 - same |
| Program Memory | 8 KB OTP | 8 KB OTP | 8 KB OTP | 16 KB OTP |
| Data RAM | 454 bytes | 454 bytes | 454 bytes | 454 bytes |
| I/O Pins | 33 | 33 | 33 | 33 |
| Supply Voltage | 2.5 V to 5 V | 4.5 V to 5.5 V | 2.5 V to 5 V | 4.5 V to 5.5 V |
| Max Clock | 33 MHz (8 MHz nominal) | 33 MHz (16 MHz nominal) | 33 MHz (8 MHz nominal) | 33 MHz (16 MHz nominal) |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Commercial | Industrial |
Key Differentiators
- Wide 2.5-5 V supply range supports both 3.3 V and 5 V rails (vs PIC17C43-16I/P)
- True drop-in DIP-40 compatibility with the PIC17C43 family (vs PIC17C44-16I/PQ)
- Single-cycle 121 ns instruction execution at 33 MHz (vs PIC16F877A)
Design Notes
Estimated: with all 33 I/O pins sourcing 10 mA, total VDD current can exceed 250 mA. Decouple VDD pin 20 with a 0.1 uF ceramic capacitor placed within 5 mm of the package and add a 10 uF bulk tantalum or aluminum polymer capacitor at the DIP socket entry. A diode-protected reverse-polarity P-FET at the input saves the OTP array when battery-equipped appliances are wired backward in the field.
PIC17 OTP programming requires a 13 V Vpp pulse on the MCLR pin during programming; standard ICSP algorithms for PIC16/PIC18 Flash parts will not program this device. Use a Microchip-approved PIC17 device programmer (e.g. MPLAB PM3 with PIC17 adapter) and verify Vpp rise time per the datasheet programming specification before production runs.
The plastic CDIP-40 package has a junction-to-ambient thermal resistance of approximately 50 C/W. With 250 mA total VDD current and 5 V supply, internal dissipation reaches 1.25 W, raising junction temperature 60 C above ambient. Designers should leave at least 10 mm of copper plane around the package and avoid sealing the part in a fully enclosed plastic housing without ventilation in high-temperature appliance applications.
Route the OSC1/OSC2 traces as short and symmetric as possible, keeping them away from PWM outputs and USART lines to avoid coupled noise. Place the oscillator load capacitors (typically 15-22 pF) directly between OSC1/OSC2 and VSS with a guarded ground return. Add a 100 ohm series resistor on MCLR if the reset line is long, to limit injected noise.
Compliance Information
RoHS and lead-free status not explicitly listed in the verified distributor pages; Microchip PIC17 family datasheet (1996 vintage) predates full RoHS documentation. AEC-Q100 qualification is NOT claimed - this is an industrial-grade part. The DIP-40 package historically contained lead-based finishes before 2006 RoHS conversion; modern tape-and-reel shipments should be verified against the latest Microchip compliance declarations.
