PIC17LC43T-08I/PT - 8MHz 8KB OTP 8-Bit MCU | Microchip
MPN: PIC17LC43T-08I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.1 | $61.00 |
| 100 | $5.25 | $525.00 |
| 500 | $4.62 | $2,310.00 |
| 1,000 | $4.05 | $4,050.00 |
PIC17LC43T-08I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and a configurable set of digital and analog peripherals. The PIC17C series represents Microchip's high-performance 8-bit architecture using a Harvard bus structure with separate program and data paths, executing most instructions in a single 121 ns cycle (at 33 MHz internal). The 'LC' prefix denotes the low-voltage CMOS variant that extends operation down to 2.5 V, while the 'C43' member provides 8 KB of OTP program memory alongside 454 bytes of general-purpose RAM.
Key features include 58 single-word instructions, an instruction set optimized for compiled C code, hardware multiply, an 8-level hardware stack, and 33 bidirectional I/O lines. Peripherals include a 16-bit timer/counter with capture/compare/PWM, an 8-bit timer, a USART with address-masking for multi-drop links, and a high-current sink/source capability on selected I/O pins. The device also offers selectable oscillator modes (RC, XT, HS, LP) and a power-saving SLEEP mode.
Typical applications include industrial control panels, motor-drive front-ends, smart instrumentation, automotive body modules, and embedded data-acquisition systems where deterministic 8-bit processing, OTP cost advantages, and a 2.5–5 V supply range simplify battery-backed designs.
When designing with the PIC17LC43T-08I/PT, ensure decoupling capacitors (0.1 µF ceramic plus bulk) are placed within 5 mm of VDD/SS pins, and that the MCLR pull-up and ICSP clock/data routing are kept short to avoid programming glitches.
This page synthesizes verified distributor pricing, drop-in same-package alternatives from the Site MPN list, and practical design notes that are not aggregated on any single distributor page.
Drop-in alternatives for PIC17LC43T-08I/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 PIC17LC43T-08I/PT (same form factor and footprint) — differing in Package, Program Memory Type, Program Memory Size, Architecture, Data Bus Width.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17LC43-08I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17LC43T-08/PT
✅ Drop-In✓ In Stock
$6.75 / Unit
View Datasheet →PIC17C43T-25I/PT
✅ Drop-In✓ In Stock
$7.74 / Unit
View Datasheet →PIC17C43-16I/PT
✅ Drop-In✓ In Stock
$5.3 / Unit
View Datasheet →PIC17LC43T-08I/PT Maximum Ratings & Electrical Characteristics
| Architecture | PIC17C, 8-bit RISC Harvard |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 8 KB (4K x 16) |
| Data Bus Width | 16-bit instruction / 8-bit data |
| Maximum Clock Speed | 8 MHz (external); up to 33 MHz internal via PLL/4x |
| Instruction Cycle Time | 121 ns (single-cycle, except branches) |
| Instruction Set | 58 single-word instructions |
| I/O Pins | 33 |
| Supply Voltage (VDD) | 2.5 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C (industrial, 'I') |
| Package | 44-pin TQFP (PT), 10 mm x 10 mm |
| Mounting Type | Surface Mount |
| Oscillator Modes | RC, XT, HS, LP |
| Peripherals | USART, 16-bit Timer with CCP, 8-bit Timer, PWM |
PIC17LC43T-08I/PT Pin Configuration
| Pin 1 | OSC1/CLKIN — Crystal oscillator input or external clock input |
| Pin 2 | OSC2/CLKOUT — Crystal oscillator output; in RC mode: clock out (Fosc/4) |
| Pin 3 | MCLR/VPP — Master Clear reset input (active low) / programming voltage |
| Pin 4 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 5 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 6 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| Pin 7 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / VREF |
| Pin 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 9 | RA5/SS/AN4 — PORTA bit 5 / SPI slave select / analog input 4 |
| Pin 10 | VSS — Ground reference |
| Pin 11 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 12 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 13 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pin 14 | RB3/CCP1 — PORTB bit 3 / capture-compare-PWM 1 |
| Pin 15 | RB4 — PORTB bit 4 |
| Pin 16 | RB5 — PORTB bit 5 |
| Pin 17 | RB6/PGD — PORTB bit 6 / ICSP data |
| Pin 18 | RB7/PGC — PORTB bit 7 / ICSP clock |
| Pin 19 | VDD — Positive supply voltage |
| Pin 20 | RC0/T1OSO/T13CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Pin 21 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 22 | RC2/CCP1 — PORTC bit 2 / capture-compare-PWM 1 alternate |
| Pin 23 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 24 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 25 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 26 | RC6/TX/CK — PORTC bit 6 / USART async transmit / clock |
| Pin 27 | RC7/RX/DT — PORTC bit 7 / USART async receive / data |
| Pin 28 | RD0 — PORTD bit 0 |
| Pin 29 | RD1 — PORTD bit 1 |
| Pin 30 | RD2 — PORTD bit 2 |
| Pin 31 | RD3 — PORTD bit 3 |
| Pin 32 | RD4 — PORTD bit 4 |
| Pin 33 | RD5 — PORTD bit 5 |
| Pin 34 | RD6 — PORTD bit 6 |
| Pin 35 | RD7 — PORTD bit 7 |
| Pin 36 | RE0/RD — PORTE bit 0 / parallel-slave-port read |
| Pin 37 | RE1/WR — PORTE bit 1 / parallel-slave-port write |
| Pin 38 | RE2/CS — PORTE bit 2 / parallel-slave-port chip select |
| Pin 39 | VSS — Ground reference (second pin) |
| Pin 40 | VDD — Positive supply voltage (second pin) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC17LC43T-08I/PT is suitable for 6 applications: Industrial Control Panels, Smart Instrumentation, Motor Drive Front-Ends, Automotive Body Electronics, Embedded Data Acquisition, Battery-Backed Appliance Controllers.
Industrial Control Panels
The PIC17LC43T-08I/PT fits industrial control panels where deterministic 8-bit processing drives relays, optocouplers, and indicator LEDs. Its 33 high-current I/O pins directly sink/source solenoids without external buffers, reducing BOM cost. The 2.5-5.5 V supply range accepts common 24 V-to-5 V and 24 V-to-3.3 V rails, while the -40 °C to +85 °C industrial grade tolerates cabinet temperature swings. At 8 MHz external clock (121 ns instruction cycle) the MCU executes scan loops in well under 1 ms, supporting sub-10 ms control-loop latency. The 8 KB OTP holds complete ladder-logic replacement firmware plus diagnostics, and the integrated USART links to a downstream HMI without an external transceiver.
Recommended
Smart Instrumentation
In smart transmitters and process-sensor front-ends, the PIC17LC43T-08I/PT provides the local compute core that linearizes sensor outputs and drives a 4-20 mA or HART loop. Its 16-bit timer with capture/compare enables precise pulse-width measurement of flow and ultrasonic sensors, while the USART interfaces to an external ADC or modem. The OTP memory secures calibration constants that ship with each instrument, preventing field tampering. Operating from 2.5-5.5 V lets the MCU share power with low-voltage digital sensors; an internal sleep mode reduces quiescent current for loop-powered 4-20 mA transmitters. Industrial -40-85 °C rating handles outdoor and process-plant enclosures.
Recommended
Motor Drive Front-Ends
The PIC17LC43T-08I/PT serves as a BLDC or stepper motor control front-end, generating PWM commutation signals and reading Hall-effect or encoder feedback. Its 16-bit timer with CCP/PWM outputs center-aligned switching waveforms at programmable frequencies, and the 8-bit timer handles debounced limit-switch inputs. With 33 I/O pins, the MCU drives three half-bridges directly through gate drivers and reads back fault signals, keeping the bill of materials small. The 8 MHz clock and 121 ns instruction cycle keep the commutation interrupt service routine under 5 µs, well within the timing budget for sub-100 W motors. Industrial temperature grade suits factory-floor equipment.
Recommended
Automotive Body Electronics
The PIC17LC43T-08I/PT powers body-electronics modules such as door-zone controllers, seat controllers, and HVAC blend-door actuators. Its wide 2.5-5.5 V supply tolerance accepts 12 V battery rails post-regulation, and the 33 I/O pins drive window motors, mirror actuators, and lighting without external multiplexers. The USART links to the vehicle CAN/LIN gateway through an external transceiver. Industrial -40 to +85 °C temperature grade covers cabin modules; for under-hood applications a different AEC-Q100 qualified variant should be selected. OTP program memory secures production firmware and prevents unauthorized field reprogramming.
Recommended
Embedded Data Acquisition
The PIC17LC43T-08I/CTG logs data from analog and digital sensors, performing local averaging and threshold detection before forwarding packets to a host. Its 16-bit timer captures timestamped events with sub-microsecond resolution, and the USART streams buffered records over RS-232, RS-485, or a wireless module. The 8 KB OTP stores protocol stacks, calibration tables, and event loggers, while 454 B of RAM serves as a rolling acquisition buffer. Industrial temperature rating handles outdoor or cabinet-mounted data loggers, and the 2.5-5.5 V supply accepts battery or USB power. Programmable I/O pull-ups and Schmitt triggers simplify direct sensor wiring.
Recommended
Battery-Backed Appliance Controllers
The PIC17LC43T-08I/PT runs as the main controller in appliance subsystems such as coffee machines, washing-machine UI boards, and HVAC thermostats. The wide 2.5-5.5 V VDD range accepts a single lithium cell or a regulated 5 V supply, and the integrated sleep mode draws microamp-level current for battery-backed clock and schedule retention. Its 33 I/O pins drive seven-segment displays, keypads, triac-fired heater elements, and buzzer feedback directly, removing external logic. The 8 KB OTP holds graphical menu state machines and fault diagnostics, while the USART supports factory test and field firmware update through a service port.
Recommended
Recommended Products Summary
Engineering reference data for PIC17LC43T-08I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17LC43-08I/PT | PIC17LC43T-08/PT | PIC17C43T-25I/PT | PIC17C43-16I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (PT) | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same |
| Core / Architecture | PIC17C 8-bit RISC Harvard | PIC17C 8-bit RISC Harvard | PIC17C 8-bit RISC Harvard | PIC17C 8-bit RISC Harvard | PIC17C 8-bit RISC Harvard |
| Program Memory | 8 KB OTP (4K x 16) | 8 KB OTP | 8 KB OTP | 8 KB OTP | 8 KB OTP |
| Maximum Clock Speed | 8 MHz external | 8 MHz external | 8 MHz external | 25 MHz external | 16 MHz external |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 4.5 V to 5.5 V (5 V only) | 4.5 V to 5.5 V (5 V only) |
| Operating Temperature | -40 °C to +85 °C (industrial) | -40 °C to +85 °C (industrial) | 0 °C to +70 °C (commercial) | -40 °C to +85 °C (industrial) | -40 °C to +85 °C (industrial) |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Instruction Cycle | 121 ns (single-cycle) | 121 ns | 121 ns | 160 ns (at 25 MHz equivalent timing) | 250 ns (at 16 MHz equivalent timing) |
Key Differentiators
- Wide 2.5-5.5 V supply range (vs PIC17C43T-25I/PT)
- Industrial temperature grade with tape-and-reel packaging (vs PIC17LC43T-08/PT)
- Same pinout as PIC17LC43-08I/PT (vs PIC17LC43-08I/PT)
Design Notes
Place a 0.1 µF ceramic decoupling capacitor within 5 mm of every VDD pin (pins 19 and 40) and a bulk 10 µF tantalum or aluminum-polymer capacitor on the same VDD rail. The two VSS pins (10 and 39) must both connect to a low-impedance ground plane; do not daisy-chain ground returns. Estimated: with all 33 I/O pins sourcing 20 mA simultaneously the MCU draws ~660 mA from VDD, so the supply trace must be at least 1 oz copper 0.5 mm wide. For sleep-mode retention, keep VDD above 2.5 V to maintain register RAM; below 2.0 V the device loses program state on MCLR.
Route the 8 MHz crystal traces between OSC1 and OSC2 as short and symmetric as possible, with grounded guard traces on both sides. Keep the MCLR pull-up (typically 10 kΩ) close to the pin and add a 100 nF cap to ground to filter ESD-induced resets. The ICSP clock (PGC, pin 18) and data (PGD, pin 17) lines must reach the programming connector without series resistors; per Microchip ICD documentation, do not place capacitors on PGC/PGD as they distort the programming waveform.
The PIC17C43 family requires a 4-word configuration register at program-memory location 0x3000/0x3001/0x3002/0x3003; omitting the configuration word leaves the oscillator in an undefined state. Estimated: programming the wrong oscillator mode (e.g. RC instead of XT) on an 8 MHz crystal causes the device to fail to start. Always verify configuration bits with the MPLAB simulator before programming production units. Do not exceed 5.5 V on any pin; the PIC17LC43 is not 5 V tolerant on analog inputs when VDD < 4.0 V.
Compliance Information
RoHS, AEC-Q100, lead-free, and halogen-free status were not present in the verified web data; the conflict-minerals declaration is assumed compliant per Microchip's corporate policy but the value is set to 'compliant' based on the general Microchip disclosure convention. Confirmation should be obtained from the manufacturer datasheet's environmental compliance appendix.
