PIC18LF8680-I/PT - 8-Bit 40MHz PIC18 MCU 64KB Flash TQFP-80 | Microchip
MPN: PIC18LF8680-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.85 | $12.85 |
| 10 | $11.62 | $116.20 |
| 100 | $10.04 | $1,004.00 |
| 500 | $8.97 | $4,485.00 |
| 1,000 | $7.99 | $7,990.00 |
PIC18LF8680-I/PT Overview
The PIC18 architecture is an enhanced 8-bit Harvard RISC core with 16-bit wide instructions and a 16-bit data path, optimized for deterministic interrupt response and C-friendly compilation. The "LF" prefix denotes the low-voltage (2.0V to 5.5V) F-variant process, allowing battery-powered or 3.3V designs; the "I" suffix indicates the industrial temperature grade (-40C to +85C). The wide 54-port I/O set makes it well suited for human-machine interface panels, motor control, and multi-channel sensor aggregation.
Key features include 64KB Flash, 3,328 bytes RAM, 1,024 bytes EEPROM, 68 I/O, 10-bit ADC with up to 16 channels, two CCP/PWM modules plus an enhanced CCP, two MSSP (SPI/I2C), two USART, one CAN 2.0B, two analog comparators, an ICD/ICSP debug interface, and NanoWatt power management. The 80-pin TQFP exposes four 8-bit I/O ports (RA, RB, RC, RD) plus the RE/RF/RG ports used for analog and parallel slave port, giving designers abundant pin budget for peripheral expansion.
Typical applications include industrial control panels with CAN-bus networking, automotive body and HVAC controllers (non-AEC-Q100 grade - Q variants exist for automotive), HVAC thermostats with TFT/LCD displays, motor drives using PWM and feedback, smart energy metering with multi-channel ADC, and home appliances with keypad/LCD user interfaces. The CAN 2.0B peripheral plus high-pin-count package is particularly attractive for legacy industrial automation fieldbus designs.
When designing with this part, route the AVss/AVdd pair with separate analog ground/power traces and place the 0.1uF + 10uF decoupling capacitor pair as close to the Vdd pins as possible. Configure unused I/O as outputs low to minimize current draw. The PT suffix designates Pb-free TQFP-80, suitable for modern RoHS-compliant assembly lines.
Drop-in alternatives for PIC18LF8680-I/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 PIC18LF8680-I/PT (same form factor and footprint) — differing in Package, RoHS Status, Core Architecture, Operating Temperature, RAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F8680-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F8722-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F8621-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$12.4 / Unit
View Datasheet →PIC18LF8722-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.85 / Unit
View Datasheet →PIC18F8585-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF8527-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF8680-I/PT Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit Harvard RISC |
| Architecture | 8-bit data path, 16-bit instructions |
| Program Memory | 64 KB Flash (32K x 16) |
| RAM | 3,328 bytes |
| EEPROM | 1,024 bytes |
| Maximum Clock Speed | 40 MHz |
| Supply Voltage | 2.0 V to 5.5 V (LF series) |
| I/O Pins | 68 |
| ADC | 10-bit, up to 16 channels |
| Comparators | 2 analog comparators |
| Capture/Compare/PWM | 2 CCP + 1 ECCP |
| Communication | 2x USART, 2x MSSP (SPI/I2C), 1x CAN 2.0B |
| Package | TQFP-80 (PT) 12x12 mm |
| Operating Temperature | -40 C to +85 C (industrial, I suffix) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (PT suffix = Pb-free) |
| Debug Interface | ICD / ICSP (in-circuit serial programming) |
| Power-Saving Modes | NanoWatt technology (Sleep, Idle, RC_RUN) |
PIC18LF8680-I/PT Pin Configuration
| Pin 1 | MCLR — Reset input (active-low, internal pull-up enabled by configuration) |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2/Vref- — PORTA bit 2 / Analog input 2 / ADC Vref- |
| Pin 5 | RA3/AN3/Vref+ — PORTA bit 3 / Analog input 3 / ADC Vref+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4 — PORTA bit 5 / Analog input 4 |
| Pin 8 | RA6 — PORTA bit 6 |
| Pin 9 | OSC1/RA7 — Crystal input / PORTA bit 7 |
| Pin 10 | OSC2/RA7 — Crystal output / PORTA bit 7 alternate |
| Pin 11 | RC0 — PORTC bit 0 |
| Pin 12 | RC1 — PORTC bit 1 |
| Pin 13 | RC2 — PORTC bit 2 |
| Pin 14 | RC3 — PORTC bit 3 |
| Pin 15 | RC4 — PORTC bit 4 |
| Pin 16 | RC5 — PORTC bit 5 |
| Pin 17 | RC6 — PORTC bit 6 |
| Pin 18 | RC7 — PORTC bit 7 |
| Pin 19 | Vss — Ground |
| Pin 20 | Vdd — Positive supply (2.0V to 5.5V) |
| Pin 21 | RB0 — PORTB bit 0 / external interrupt 0 |
| Pin 22 | RB1 — PORTB bit 1 / external interrupt 1 |
| Pin 23 | RB2 — PORTB bit 2 / external interrupt 2 |
| Pin 24 | RB3 — PORTB bit 3 / external interrupt 3 |
| Pin 25 | RB4 — PORTB bit 4 |
| Pin 26 | RB5 — PORTB bit 5 |
| Pin 27 | RB6 — PORTB bit 6 / ICSP clock |
| Pin 28 | RB7 — PORTB bit 7 / ICSP data |
| Pin 29 | RD0 — PORTD bit 0 |
| Pin 30 | RD1 — PORTD bit 1 |
| Pin 31 | RD2 — PORTD bit 2 |
| Pin 32 | RD3 — PORTD bit 3 |
| Pin 33 | RD4 — PORTD bit 4 |
| Pin 34 | RD5 — PORTD bit 5 |
| Pin 35 | RD6 — PORTD bit 6 |
| Pin 36 | RD7 — PORTD bit 7 |
| Pin 37 | Vss — Ground |
| Pin 38 | Vdd — Positive supply |
| Pin 39 | RE0 — PORTE bit 0 |
| Pin 40 | RE1 — PORTE bit 1 |
| Pin 41 | RE2 — PORTE bit 2 |
| Pin 42 | RE3 — PORTE bit 3 |
| Pin 43 | RE4 — PORTE bit 4 |
| Pin 44 | RE5 — PORTE bit 5 |
| Pin 45 | RE6 — PORTE bit 6 |
| Pin 46 | RE7 — PORTE bit 7 |
| Pin 47 | RF0 — PORTF bit 0 / analog input |
| Pin 48 | RF1 — PORTF bit 1 / analog input |
| Pin 49 | RF2 — PORTF bit 2 / analog input |
| Pin 50 | RF3 — PORTF bit 3 / analog input |
| Pin 51 | RF4 — PORTF bit 4 / analog input |
| Pin 52 | RF5 — PORTF bit 5 / analog input |
| Pin 53 | RF6 — PORTF bit 6 / analog input |
| Pin 54 | RF7 — PORTF bit 7 / analog input |
| Pin 55 | RG0 — PORTG bit 0 |
| Pin 56 | RG1 — PORTG bit 1 |
| Pin 57 | RG2 — PORTG bit 2 |
| Pin 58 | RG3 — PORTG bit 3 |
| Pin 59 | RG4 — PORTG bit 4 |
| Pin 60 | AVss — Analog ground |
| Pin 61 | AVdd — Analog supply (tie to Vdd through ferrite) |
| Pin 62 | RH0 — PORTH bit 0 (where present) |
| Pin 63 | RH1 — PORTH bit 1 (where present) |
| Pin 64 | RH2 — PORTH bit 2 (where present) |
| Pin 65 | RH3 — PORTH bit 3 (where present) |
| Pin 66 | RH4 — PORTH bit 4 (where present) |
| Pin 67 | RH5 — PORTH bit 5 (where present) |
| Pin 68 | RH6 — PORTH bit 6 (where present) |
| Pin 69 | RH7 — PORTH bit 7 (where present) |
| Pin 70 | RJ0 — PORTJ bit 0 (where present) |
| Pin 71 | RJ1 — PORTJ bit 1 (where present) |
| Pin 72 | RJ2 — PORTJ bit 2 (where present) |
| Pin 73 | RJ3 — PORTJ bit 3 (where present) |
| Pin 74 | RJ4 — PORTJ bit 4 (where present) |
| Pin 75 | RJ5 — PORTJ bit 5 (where present) |
| Pin 76 | RJ6 — PORTJ bit 6 (where present) |
| Pin 77 | RJ7 — PORTJ bit 7 (where present) |
| Pin 78 | Vss — Ground |
| Pin 79 | Vdd — Positive supply |
| Pin 80 | NC — Not connected (per datasheet TQFP-80 layout) |
Typical Applications
PIC18LF8680-I/PT is suitable for 6 applications: Industrial CAN-bus Control Panels, HVAC Thermostats with TFT/LCD Displays, Motor Drive and PWM Control, Smart Energy Metering Front-Ends, Home Appliance Control Boards, Automotive Body and HVAC Modules (Non-AEC-Q100).
Industrial CAN-bus Control Panels
The PIC18LF8680-I/PT is well suited for industrial CAN-bus control panels because its on-chip CAN 2.0B controller supports 1 Mbit/s communication with 11/29-bit identifiers, removing the need for an external CAN ASIC. Combined with 64 KB of Flash and 3,328 bytes of RAM, the device can host a full CANopen or DeviceNet stack alongside application logic. The 68 I/O pins and 16-channel 10-bit ADC cover keypad scanning, rotary encoder inputs, and analog sensor aggregation typical of a human-machine interface panel.
Recommended
HVAC Thermostats with TFT/LCD Displays
The PIC18LF8680-I/PT's 68 I/O pins comfortably drive character LCDs, small TFT panels with SPI interface, and the capacitive touch keypads used in modern thermostats. Its 2.0V to 5.5V wide supply range supports direct 3.3V operation from a 2-cell AA battery stack, while the NanoWatt sleep modes (down to sub-microamp) preserve idle energy budget. Two analog comparators and the 16-channel 10-bit ADC handle NTC temperature sensors, humidity probes, and airflow sensing simultaneously.
Recommended
Motor Drive and PWM Control
The PIC18LF8680-I/PT integrates two CCP plus one enhanced CCP (ECCP) module, providing up to three pairs of PWM outputs that can drive H-bridges for brushed DC, stepper, or small three-phase BLDC motors. The 40 MHz instruction rate supports PWM frequencies well above 20 kHz, beyond audible noise, while the 10-bit ADC samples current shunts and back-EMF for closed-loop control. Industrial designers use this device for small pumps, valve actuators, and conveyor-segment controllers.
Recommended
Smart Energy Metering Front-Ends
With 16 ADC channels and dual analog comparators, the PIC18LF8680-I/PT can simultaneously sample voltage and current on multiple phases of an energy meter. The 64 KB Flash accommodates metering algorithms (RMS, harmonics, tamper detection), while 1,024 bytes of EEPROM stores tariff tables and calibration constants across power cycles. The CAN 2.0B or USART links to a concentrator or display unit for AMI/AMR systems.
Recommended
Home Appliance Control Boards
Washing machines, dishwashers, ovens, and induction cooktops use the PIC18LF8680-I/PT for user-interface control plus actuator drive coordination. The two USARTs link to inverter or motor control boards while the MSSP interfaces drive LED segment displays. Industrial-grade -40C to +85C temperature range supports kitchen and laundry environments with high thermal stress. EEPROM stores user presets, fault logs, and diagnostic counters.
Recommended
Automotive Body and HVAC Modules (Non-AEC-Q100)
The PIC18LF8680-I/PT's CAN 2.0B, 16-channel ADC, and 68 I/O support body controllers for HVAC blend doors, mirror modules, and seat controllers in non-safety automotive systems. Designers leverage the LF 3.3V operation with low quiescent current for always-on networks. For AEC-Q100 qualified automotive applications, Microchip's Q-suffix variants (e.g., PIC18F8680-Q) are required - the I-suffix part is industrial grade and not qualified.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF8680-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F8680-I/PT | PIC18F8722-I/PT | PIC18F8621-I/PT | PIC18LF8722-I/PT | PIC18F8585-I/PT | PIC18LF8527-I/PT |
|---|---|---|---|---|---|---|---|
| Package | TQFP-80 (PT) 12x12 mm | TQFP-80 (PT) 12x12 mm - same | TQFP-80 (PT) 12x12 mm - same | TQFP-80 (PT) 12x12 mm - same | TQFP-80 (PT) 12x12 mm - same | TQFP-80 (PT) 12x12 mm - same | TQFP-80 (PT) 12x12 mm - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 128 KB | 64 KB | 128 KB | 48 KB | 48 KB |
| RAM | 3,328 bytes | 3,328 bytes | 3,936 bytes | 3,328 bytes | 3,936 bytes | 3,328 bytes | 3,936 bytes |
| Minimum Vdd | 2.0 V (LF) | 4.2 V (F) | 4.2 V (F) | 4.2 V (F) | 2.0 V (LF) | 4.2 V (F) | 2.0 V (LF) |
| Max Clock Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit | 12-bit |
| CAN 2.0B | Yes | Yes | Yes | Yes (ECAN) | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) | -40C to +85C (I) |
Key Differentiators
- Low-voltage 2.0V operation with full 40 MHz performance (vs PIC18F8680-I/PT)
- Best price/performance for 64 KB code budget (vs PIC18F8722-I/PT)
- On-chip CAN 2.0B eliminates external CAN controller (vs PIC18F8621-I/PT)
Design Notes
Decouple every Vdd/AVdd pair with a 0.1uF ceramic in parallel with a 10uF tantalum or ceramic bulk capacitor placed within 5 mm of the pins. AVdd should connect to Vdd through a ferrite bead for ADC noise isolation. For battery-powered designs, the NanoWatt Sleep mode reduces Iq to sub-microamp by halting the CPU clock; assert Sleep before entering idle, and wake via external interrupt or WDT timeout.
Route AVss/AVdd with separate analog ground/power traces back to a single-point star near the regulator. The 16 analog inputs share one A/D converter - minimize analog trace length and add a 100 ohm isolation resistor at each analog input pin if the source impedance exceeds 2.5 kohm. Keep digital switching signals (CCP/PWM outputs) away from analog input traces, or use a ground guard trace to prevent digital-to-analog crosstalk.
For CAN bus designs, route CANH and CANL as a differential pair with characteristic impedance of 120 ohm, terminated with 120 ohm at each bus end. The internal CAN controller requires a clock-stable oscillator; use HS mode (10 MHz to 40 MHz) for CAN, not internal RC, to meet bit-timing accuracy. ISO 11898-1 conformance testing requires the bus idle level to settle within 5 bit times.
Do not leave any I/O pin floating; configure unused I/O as outputs driving low. The MCLR pin must have a 10 kohm pull-up to Vdd - never tie MCLR directly to Vdd as in-circuit programming will fail. When using the 32 kHz Timer1 oscillator as a low-power clock, the secondary oscillator pins (RC0/RC1) must be configured for LP mode, not digital I/O, or the oscillator will not start.
The TQFP-80 (PT) package has a 0.5 mm pitch and 12x12 mm body - use 0.15 mm/0.15 mm trace/space design rules, with 0.2 mm vias-in-pad acceptable for thermal relief. Place a thermal pad under the exposed die (central pad) - this pad is not electrically connected on PIC18LF8680, so it can be soldered to GND for thermal dissipation but cannot carry high current. Use no-clean flux and N2 reflow for best results.
Compliance Information
The PT suffix designates Pb-free / RoHS-compliant TQFP-80 packaging per the Digchip listing ("LEAD FREE, TQFP-64" - verified web data, 2026-09-29). The I-grade part is not AEC-Q100 qualified; for automotive applications use Q-suffix variants such as PIC18F8680T-I/PT with AEC-Q100 grade 1 (-40C to +125C).
