PIC18LF4680T-I/PT - 40MHz 8-bit MCU w/ CAN & 64KB Flash | Microchip
MPN: PIC18LF4680T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.94 | $6.94 |
| 10 | $6.42 | $64.20 |
| 100 | $5.87 | $587.00 |
| 500 | $5.31 | $2,655.00 |
| 1,000 | $4.78 | $4,780.00 |
PIC18LF4680T-I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory, peripherals, and I/O into one package. The PIC18F family sits within the broader taxonomy of microcontroller -> embedded controller -> semiconductor -> integrated circuit. The 'LF' prefix designates the low-voltage F-series variant operating across 2.0V to 5.5V, which targets battery-powered and energy-conscious designs via Microchip's nanoWatt Technology for dynamic power management.
Key features include an integrated Enhanced CAN (ECAN) module, hardware USART, I2C, SPI, and Parallel Slave Port (PSP) interfaces, 11 channels of 10-bit ADC, two capture/compare/PWM (CCP) modules, and an enhanced capture/compare/PWM (ECCP) module. The device also integrates a 16-bit timer, two 8-bit timers, and nanoWatt power management including idle, sleep, and run modes with on-the-fly clock switching.
The architecture pairs a Harvard-style CPU with separate program and data buses, which lets the 40MHz oscillator fetch instructions in parallel with data accesses for deterministic throughput. The Enhanced CAN module provides hardware acceptance filters, multiple transmit/receive buffers, and supports both standard and extended identifiers, removing the host CPU from heavy protocol processing.
Typical applications include automotive body and chassis networks, industrial CAN-based sensor hubs, building automation gateways, embedded control boards, and portable medical devices. The wide 2.0-5.5V operating range and nanoWatt modes also make it suitable for battery-backed telemetry nodes and remote sensor interfaces.
When designing with the PIC18LF4680T-I/PT, ensure decoupling capacitors are placed within 4mm of each power pin, and that the CAN bus is terminated with 120 ohm resistors at each end of the network. The 'T' suffix denotes tape-and-reel packaging for high-volume assembly, while the 'I' grade indicates an operating temperature range of -40C to +85C suitable for industrial environments.
This page synthesizes distributor pricing, drop-in TQFP-44 alternatives, and practical design notes drawn from the PIC18F2585/2680/4585/4680 datasheet, providing context not found in any single manufacturer or distributor page.
Drop-in alternatives for PIC18LF4680T-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 PIC18LF4680T-I/PT (same form factor and footprint) — differing in Package, ADC, Core Architecture, Program Memory (Flash), Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F4680-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4685-I/PT
✅ Drop-In✓ In Stock
$7.2 / Unit
View Datasheet →PIC18LF4580-I/PT
✅ Drop-In✓ In Stock
$5.65 / Unit
View Datasheet →PIC18LF4585-I/PT
✅ Drop-In✓ In Stock
$6.34 / Unit
View Datasheet →PIC18LF4480-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F458-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF4680T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit RISC, Harvard) |
| Maximum Clock Frequency | 40 MHz (12 MIPS) |
| Program Memory (Flash) | 64 KB (32K x 16) |
| Data RAM | 3.25 KB (3328 bytes) |
| Data EEPROM | 1 KB |
| ADC Resolution | 10 bit, 11 channels |
| Supply Voltage | 2.0 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| I/O Pins | 36 (general-purpose) / 34 (I/O Ports per datasheet summary) |
| Package | TQFP-44 (10 x 10 mm) |
| Mounting Type | Surface Mount (Tape & Reel) |
| Communication Interfaces | ECAN, USART, I2C, SPI, PSP |
| Timer Modules | 2x 8-bit, 1x 16-bit, 2x CCP, 1x ECCP |
| Power-Saving Modes | nanoWatt Technology (Idle, Sleep, Run, Clock Switching) |
| Lead-Free / RoHS | Yes (per Microchip product page) |
PIC18LF4680T-I/PT Pin Configuration
| Pin 1 | RA0/AN0 — Digital I/O RA0 / Analog input AN0 |
| Pin 2 | RA1/AN1 — Digital I/O RA1 / Analog input AN1 |
| Pin 3 | RA2/AN2 — Digital I/O RA2 / Analog input AN2 |
| Pin 4 | RA3/AN3/VREF+ — Digital I/O RA3 / Analog input AN3 / ADC VREF+ |
| Pin 5 | RA4/T0CKI — Digital I/O RA4 / Timer0 clock input |
| Pin 6 | RA5/AN4/SS/HLVDIN — Digital I/O RA5 / Analog input AN4 / SSP select / HLVD input |
| Pin 7 | RA6/OSC2/CLKO — Digital I/O RA6 / Oscillator output / Clock output |
| Pin 8 | RA7/OSC1/CLKI — Digital I/O RA7 / Oscillator input / Clock input |
| Pin 9 | RB0/INT0/FLT0 — Digital I/O RB0 / External interrupt 0 / PWM fault input |
| Pin 10 | RB1/INT1 — Digital I/O RB1 / External interrupt 1 |
| Pin 11 | RB2/INT2/CANTX — Digital I/O RB2 / External interrupt 2 / CAN TX |
| Pin 12 | RB3/INT3/CANRX — Digital I/O RB3 / External interrupt 3 / CAN RX |
| Pin 13 | RB4/INT4/KBI0 — Digital I/O RB4 / External interrupt 4 / Keyboard interrupt |
| Pin 14 | RB5/KBI1/PGM — Digital I/O RB5 / Keyboard interrupt / LVP program |
| Pin 15 | RB6/KBI2/PGC — Digital I/O RB6 / Keyboard interrupt / ICSP clock |
| Pin 16 | RB7/KBI3/PGD — Digital I/O RB7 / Keyboard interrupt / ICSP data |
| Pin 17 | VDD — Positive supply (3.3V or 5V) |
| Pin 18 | VSS — Ground |
| Pin 19 | RC0/T1OSO/T1CKI — Digital I/O RC0 / Timer1 oscillator output / Timer1 clock |
| Pin 20 | RC1/T1OSI/CCP2 — Digital I/O RC1 / Timer1 oscillator input / CCP2 output |
| Pin 21 | RC2/CCP1 — Digital I/O RC2 / CCP1 output |
| Pin 22 | RC3/SCK/SCL — Digital I/O RC3 / SPI clock / I2C clock |
| Pin 23 | RC4/SDI/SDA — Digital I/O RC4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — Digital I/O RC5 / SPI data out |
| Pin 25 | RC6/TX/CK — Digital I/O RC6 / USART TX / USART clock |
| Pin 26 | RC7/RX/DT — Digital I/O RC7 / USART RX / USART data |
| Pin 27 | RE0/RD/AN5 — Digital I/O RE0 / PSP read / Analog input AN5 |
| Pin 28 | RE1/WR/AN6 — Digital I/O RE1 / PSP write / Analog input AN6 |
| Pin 29 | RE2/CS/AN7 — Digital I/O RE2 / PSP chip select / Analog input AN7 |
| Pin 30 | VDD — Positive supply (3.3V or 5V) |
| Pin 31 | VSS — Ground |
| Pin 32 | RD0/PSP0/C1OUT — Digital I/O RD0 / PSP data bit 0 / Comparator 1 output |
| Pin 33 | RD1/PSP1/C2OUT — Digital I/O RD1 / PSP data bit 1 / Comparator 2 output |
| Pin 34 | RD2/PSP2 — Digital I/O RD2 / PSP data bit 2 |
| Pin 35 | RD3/PSP3 — Digital I/O RD3 / PSP data bit 3 |
| Pin 36 | RD4/PSP4/ECCP1/P1A — Digital I/O RD4 / PSP data bit 4 / ECCP1 output / PWM P1A |
| Pin 37 | RD5/PSP5/P1B — Digital I/O RD5 / PSP data bit 5 / PWM P1B |
| Pin 38 | RD6/PSP6/P1C — Digital I/O RD6 / PSP data bit 6 / PWM P1C |
| Pin 39 | RD7/PSP7/P1D — Digital I/O RD7 / PSP data bit 7 / PWM P1D |
| Pin 40 | AVDD — Analog positive supply |
| Pin 41 | AVSS — Analog ground |
| Pin 42 | MCLR/VPP/RE3 — Master clear reset / Programming voltage / Digital I/O RE3 |
| Pin 43 | VDD — Positive supply (3.3V or 5V) |
| Pin 44 | VSS — Ground |
Typical Applications
PIC18LF4680T-I/PT is suitable for 6 applications: Industrial CAN Sensor Hubs, Automotive Body Control Modules, Building Automation Gateways, Portable Battery-Powered Telemetry Nodes, Medical Device Control Boards, Industrial Motor Control.
Industrial CAN Sensor Hubs
The PIC18LF4680T-I/PT's integrated Enhanced CAN module with hardware acceptance filters makes it a strong fit for industrial sensor hubs where 8-bit cost, 2.0-5.5V operation, and proven determinism are required. The 64KB Flash comfortably holds 32K instructions of CANopen or DeviceNet stack plus application code. Placed on the 5V industrial bus with an MCP2551 CAN transceiver and 120 ohm termination at each end, the MCU handles bus arbitration in hardware while the CPU runs control loops. nanoWatt sleep drops quiescent current below 100 nA, ideal for 24V-powered but duty-cycled nodes. Compared to bit-banged CAN on smaller PICs, the ECAN module frees the CPU for sensor sampling on 11 ADC channels.
Recommended
Automotive Body Control Modules
The PIC18LF4680T-I/PT is used in body and chassis control modules for CAN-based networks with operating temperature -40C to +85C across the full 2.0-5.5V supply range, suiting 12V automotive rails after pre-regulation. Its 3.25KB RAM handles CAN receive buffers and CCP PWM timing for lighting or seat-control actuators, while 1KB EEPROM stores configurable vehicle parameters. The ECCP module provides hardware PWM dead-band control for motor drivers, eliminating the jitter from software PWM. Industrial 'I' grade fits cabin modules, while 'E' grade variants like PIC18F4680-E/PT target under-hood environments with +125C.
Recommended
Building Automation Gateways
Building automation gateways benefit from the PIC18LF4680T-I/PT's combination of ECAN for floor-level sensor data communication, USART for Modbus RTU over RS-485, and MSSP for I2C sensor hubs. The 10-bit ADC with 11 channels can directly read temperature, humidity, and airflow sensors without external analog front ends. Industrial-grade operation from -40C to +85C handles unheated mechanical rooms and rooftop enclosures. nanoWatt run/idle/sleep modes drop the gateway quiescent current to under 1 uA in idle, important for low-power harvested-power designs.
Recommended
Portable Battery-Powered Telemetry Nodes
The PIC18LF4680T-I/PT runs directly from a single 3.3V Li-ion or two AA cells thanks to its 2.0V minimum supply, removing the need for an additional boost regulator. nanoWatt idle and sleep modes combined with on-the-fly clock switching let a duty-cycled telemetry node consume under 1 uA between transmissions, extending battery life for remote installations. The 1KB EEPROM stores calibration constants across power cycles, while the 10-bit ADC with 11 channels monitors battery voltage, temperature, and sensor inputs. Compared to 5V-only PIC18F4680, the LF variant enables compact battery-powered CAN nodes.
Recommended
Medical Device Control Boards
Medical device control boards such as infusion pumps, blood-pressure monitors, and small benchtop analyzers use the PIC18LF4680T-I/PT for its deterministic PIC18 core, 5.5V-tolerant I/O for legacy analog front ends, and reliability of nanoWatt Technology. The 64KB Flash is ample for RTOS-lite scheduling of motor control via the ECCP module, sensor reads over the 11-channel 10-bit ADC, and operator UI on a character LCD over I2C or SPI. Industrial -40C to +85C operation handles most medical environments without requiring automotive-temperature E-grade parts.
Recommended
Industrial Motor Control
The PIC18LF4680T-I/PT's ECCP module generates hardware PWM with programmable dead-band control and 4 output channels, ideal for BLDC and 3-phase motor drives. Up to 25 MHz PWM frequency from the 40 MHz system clock handles 20 kHz switching above the audible range with tight regulation. The 10-bit ADC on 11 channels can sample motor phase currents via current-sense amplifiers, while the ECAN module reports back to the central controller. Compared to software PWM on smaller PICs, the ECCP module provides jitter-free switching, critical for low-noise motor operation.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF4680T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F4680-I/PT | PIC18F4685-I/PT | PIC18LF4580-I/PT | PIC18LF4585-I/PT | PIC18LF4480-I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-44 | TQFP-44 (same) | TQFP-44 (same) | TQFP-44 (same) | TQFP-44 (same) | TQFP-44 (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 96 KB | 32 KB | 48 KB | 16 KB |
| Operating Voltage | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| CAN Peripheral | ECAN | ECAN | ECAN | ECAN | ECAN | None |
| Data RAM | 3.25 KB | 3.25 KB | 3.25 KB | 2 KB | 3.25 KB | 768 B |
| Data EEPROM | 1 KB | 1 KB | 1 KB | 256 B | 1 KB | None |
| ADC Channels | 11 x 10-bit | 11 x 10-bit | 11 x 10-bit | 8 x 10-bit | 11 x 10-bit | 11 x 10-bit |
| Industrial Grade (-40C to +85C) | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Wide 2.0V to 5.5V supply range, broadest in the PIC18F4680 family (vs PIC18F4680-I/PT)
- 64KB Flash balances code space and die cost (vs PIC18LF4585-I/PT)
- Integrated Enhanced CAN module with hardware filters (vs PIC18LF4480-I/PT)
Design Notes
Place a 100 nF decoupling capacitor within 4 mm of every VDD/AVDD pin and a 10 uF bulk capacitor near the MCU's main VDD pin. The PIC18LF4680T-I/PT has three VDD and three VSS pins on TQFP-44; if any pair is left undecoupled the ECAN module may glitch during bus arbitration, producing sporadic CAN error frames. Use a ferrite bead or small inductor between digital VDD and analog AVDD if switching noise on the digital rail exceeds 50 mVpk.
Do not exceed 5.5 V absolute maximum on any I/O pin, even when the MCU is in 3.3V mode. The CAN bus transceivers (e.g., MCP2551) may pass 5 V bus-side transients to the CANTX/CANRX pins during short-to-battery events; if your system is automotive, add TVS diodes or series resistors on the CAN lines. Always configure the CONFIG3H register's CANMX bit correctly so CANTX maps to RB2 and CANRX maps to RB3 - the alternate mapping on CANTX/CANRX (RC6/RC7) collides with the USART default pins.
The TQFP-44 package has a junction-to-ambient thermal resistance of approximately 45 C/W; at full 40 MHz operation across -40C to +85C, the silicon will dissipate up to 250 mW under typical load. In enclosed industrial enclosures, derate to 20 MHz or add thermal copper pours under the exposed pad. The 'I' industrial grade is rated for +85C ambient; do not substitute 'E' (extended, +125C) if the design is purely industrial - the E-grade costs more without need.
Compliance Information
RoHS compliant per Microchip product page. Industrial -40C to +85C operating range (I grade); AEC-Q100 automotive qualification is not applicable to the I-grade variant - choose the PIC18F4680-E/PT for AEC-Q100 automotive designs.
