PIC18LF2682T-I/SO - 8-Bit 40MHz MCU 80KB Flash | Microchip
MPN: PIC18LF2682T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.2 | $6.20 |
| 10 | $5.58 | $55.80 |
| 100 | $4.97 | $497.00 |
| 500 | $4.45 | $2,225.00 |
| 1,000 | $3.98 | $3,980.00 |
PIC18LF2682T-I/SO Overview
What is a PIC18 microcontroller? PIC18 is Microchip's high-performance 8-bit MCU family using an enhanced RISC architecture with a 16-bit instruction word and 8-bit data path, sitting above the baseline PIC16 family in the Microchip taxonomy: PIC10/12/16 (baseline) -> PIC18 (mid-range enhanced) -> PIC24/dsPIC (16-bit) -> PIC32MX (32-bit MIPS) -> PIC32MZ (32-bit ARM-class). The PIC18 line is widely deployed in automotive body, industrial control, and consumer applications because it balances deterministic 8-bit peripherals (CAN, ADC, PWM, I2C/SPI) with a mature, low-cost toolchain (MPLAB X IDE, XC8 compiler).
Key features include 25 digital I/O pins, an internal oscillator, a 10-bit ADC with up to 8 channels, an ECAN module for Controller Area Network communications, dual analog comparators, dual USART, MSSP (SPI/I2C), and capture/compare/PWM modules. The 28-SOIC wide package provides hand-solder-friendly leads and generous thermal mass for industrial environments, with an operating temperature range of -40C to +85C.
Architecturally, the PIC18LF2682 uses a 16-bit modified Harvard bus with a 31-level hardware stack and 8x8 hardware multiply, enabling 40 MIPS performance from a single-cycle instruction execution at 40 MHz. On-chip peripherals like ECAN and the 10-bit ADC share dedicated DMA-free interrupt vectors, allowing deterministic response times suitable for real-time control loops.
Typical applications include CAN bus node endpoints (automotive body controllers, industrial sensor hubs), low-power sensor conditioning frontends, brushed DC motor control, smart energy metering, and embedded human-machine interface panels where a 3.3 V single supply, generous flash, and proven long-term Microchip silicon longevity make it a workhorse choice.
When designing with this device, allocate 1 to 2 ICSP pins and reserve a 4.7 kohm pull-up on MCLR to enable in-circuit serial programming; configure the configuration bits for the LF voltage range (2.0 V - 3.6 V) and internal oscillator to minimize external BOM cost.
This page synthesizes drop-in alternatives, distributor pricing tiers, and practical design notes drawn from Microchip datasheets and reference designs, providing actionable engineering value beyond what is found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18LF2682T-I/SO — 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 PIC18LF2682T-I/SO (same form factor and footprint) — differing in ADC, Operating Temperature, Package, Timers, CAN Module.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F2682T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF2682-I/SO
✅ Drop-In✓ In Stock
$6.05 / Unit
View Datasheet →PIC18LF2680T-I/SO
✅ Drop-In✓ In Stock
$5.21 / Unit
View Datasheet →PIC18LF4682T-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18LF2682T-I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit enhanced RISC |
| CPU Architecture | Modified Harvard, 16-bit instruction / 8-bit data |
| Instruction Set | PIC18 (75 instructions, 8x8 hardware multiply) |
| Max CPU Frequency | 40 MHz (10 MIPS, 4 cycles per instruction) |
| FLASH Program Memory | 80 KB (40K x 16 words) |
| RAM | 3.25 KB (3328 bytes) |
| EEPROM | 1 KB |
| I/O Pins | 25 |
| Package | 28-SOIC wide (0.295 inch / 7.50 mm body width) |
| Operating Voltage Range | 2.0 V to 3.6 V (LF family) |
| Operating Temperature | -40C to +85C (industrial, "I" suffix) |
| ADC | 10-bit, 8 channels |
| CAN | ECAN module |
| Communication | 2x USART (LIN/IrDA capable), MSSP (SPI / I2C) |
| Timers | Multiple 8-bit and 16-bit timers with CCP/ECCP |
| Comparators | 2x analog comparators |
| PWM Channels | Enhanced CCP (ECCP) outputs |
| Oscillator | Internal + external crystal/clock options |
| ICSP | In-Circuit Serial Programming supported |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel ("T" suffix) |
| MSL Level | 1 (unlimited floor life at <=30 C/85% RH) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC18LF2682T-I/SO Pin Configuration
| Pin 1 | MCLR/RE3 — Master Clear (Reset) input or digital input RE3 |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input AN0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input AN1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input AN2 / VREF- |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input AN3 / VREF+ |
| Pin 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock input / Comparator 1 output |
| Pin 7 | RA5/AN4/SS/C2OUT — PORTA bit 5 / analog input AN4 / SPI slave select / Comparator 2 output |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/RA7 — Oscillator crystal input or PORTA bit 7 |
| Pin 10 | OSC2/RA6 — Oscillator crystal output or PORTA bit 6 |
| Pin 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 PWM output |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / Enhanced CCP1 PWM output |
| Pin 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 17 | RC6/TX/CK — PORTC bit 6 / USART async transmit / USART sync clock |
| Pin 18 | RC7/RX/DT — PORTC bit 7 / USART async receive / USART sync data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage (2.0 V - 3.6 V for LF) |
| Pin 21 | RB0/INT0/AN12 — PORTB bit 0 / external interrupt 0 / analog input AN12 |
| Pin 22 | RB1/INT1/AN10 — PORTB bit 1 / external interrupt 1 / analog input AN10 |
| Pin 23 | RB2/INT2/AN8 — PORTB bit 2 / external interrupt 2 / analog input AN8 |
| Pin 24 | RB3/AN9/CCP2 — PORTB bit 3 / analog input AN9 / CCP2 alt |
| Pin 25 | RB4/AN11/KBI0 — PORTB bit 4 / analog input AN11 / interrupt-on-change KBI0 |
| Pin 26 | RB5/KBI1/PGM — PORTB bit 5 / interrupt-on-change KBI1 / LVP programming |
| Pin 27 | RB6/KBI2/PGC — PORTB bit 6 / interrupt-on-change KBI2 / ICSP clock |
| Pin 28 | RB7/KBI3/PGD — PORTB bit 7 / interrupt-on-change KBI3 / ICSP data |
Typical Applications
PIC18LF2682T-I/SO is suitable for 7 applications: CAN Bus Node Endpoint for Automotive Body Controllers, Industrial Sensor Hub with CAN Connectivity, Low-Voltage Sensor Conditioning Frontend, Brushed DC Motor Control / PWM Driver, Smart Energy Meter / Sub-Metering Frontend, Embedded HMI / Display Controller Panel, IoT Sensor Bridge / Wireless Gateway.
CAN Bus Node Endpoint for Automotive Body Controllers
The PIC18LF2682T-I/SO's on-chip ECAN peripheral with hardware acceptance filtering makes it a drop-in CAN node controller for automotive body networks (body control modules, door/window nodes, mirror controllers) and industrial CANopen sensor hubs. Operating from 2.0 V to 3.6 V on a single-cell Li-ion rail, the LF variant reduces regulator cost. The 80 KB FLASH holds a full CANopen or J1939 stack without external memory, while 25 I/O drive LEDs, switches, and H-bridge MOSFETs directly. Hardware ECAN filtering offloads message acceptance from CPU, leaving MIPS for application logic.
Recommended
Industrial Sensor Hub with CAN Connectivity
The PIC18LF2682T-I/SO serves as a 3.3 V sensor aggregator in industrial 4.0 environments, reading 4-20 mA analog inputs via the 10-bit ADC and transmitting aggregated data over ECAN or RS-485. With 80 KB flash, the device hosts Modbus RTU or CANopen slave stacks alongside application logic. Internal oscillator eliminates external crystal, lowering BOM cost for compact DIN-rail mounted sensor modules. Industrial -40 C to +85 C rating ensures operation in sealed enclosures with minimal derating.
Recommended
Low-Voltage Sensor Conditioning Frontend
The PIC18LF2682T-I/SO runs directly from a single 18650 Li-ion cell (2.4 V - 4.2 V regulated to 3.3 V), making it ideal for portable sensor conditioning, handheld meters, and battery-powered instrumentation. 25 I/O interface to bridge sensors (load cells, thermocouples, RTDs) through analog comparators and the 10-bit ADC; the LF voltage range tolerates Li-ion discharge down to 2.0 V without brown-out. The 1 KB EEPROM stores nonvolatile calibration coefficients across power cycles.
Recommended
Brushed DC Motor Control / PWM Driver
The PIC18LF2682T-I/SO integrates Enhanced CCP (ECCP) PWM outputs and analog comparators suitable for brushed DC motor speed control, solenoid drivers, and small brushed-servo loops. The 40 MHz CPU delivers 10 MIPS for deterministic PWM timing with hardware fault inputs from the comparators. H-bridge MOSFETs interface directly to 25 I/O pins, while ECAN feedback publishes motor telemetry to a master controller. Operating at 3.3 V simplifies low-side gate drive design.
Recommended
Smart Energy Meter / Sub-Metering Frontend
The PIC18LF2682T-I/SO's 10-bit ADC samples current-transformer and Rogowski coil signals for residential energy sub-metering and power-monitoring nodes. The 80 KB FLASH holds metering algorithms (RMS, VAR, frequency) plus a Modbus or DLMS/COSEM stack. ECAN or RS-485 connectivity enables integration into building automation networks. The industrial -40 C to +85 C rating and LF voltage tolerance suit outdoor meter enclosures powered by 12-24 V stepped down to 3.3 V.
Recommended
Embedded HMI / Display Controller Panel
The PIC18LF2682T-I/SO drives character LCDs, segment displays, and small graphic OLEDs via SPI or parallel GPIO from a compact 28-SOIC form factor. Its 80 KB FLASH supports custom bitmap fonts, menu structures, and Modbus RTU command parsing for industrial HMI panels. The MSSP SPI peripheral clocks high-throughput OLED displays, while dual USART handles debug logging and field-bus connectivity. Operating from 3.3 V eliminates level shifters for modern OLED controllers.
Recommended
IoT Sensor Bridge / Wireless Gateway
The PIC18LF2682T-I/SO acts as a wired-to-wireless bridge between local CAN/RS-485 sensor networks and an external Wi-Fi or LoRa module, aggregating up to 25 sensor inputs and forwarding telemetry. SPI (MSSP) interfaces directly to RN2483 LoRa or ESP8266 modules, while ECAN/USART handle the wired side. 3.3 V operation matches common wireless module supply rails. Industrial temperature rating supports outdoor IoT enclosures and factory-floor sensor gateways.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF2682T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F2682T-I/SO | PIC18LF2682-I/SO | PIC18LF2680T-I/SO |
|---|---|---|---|---|
| Package | 28-SOIC (7.50 mm wide) | 28-SOIC — same | 28-SOIC — same | 28-SOIC — same |
| Brand | Microchip Technology | Microchip Technology — same | Microchip Technology — same | Microchip Technology — same |
| Voltage Range | 2.0 V - 3.6 V (LF) | 4.2 V - 5.5 V (F) | 2.0 V - 3.6 V (LF) | 2.0 V - 3.6 V (LF) |
| FLASH Program Memory | 80 KB | 80 KB | 80 KB | 64 KB |
| RAM | 3.25 KB | 3.25 KB | 3.25 KB | 3.25 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB |
| ECAN Module | Yes | Yes | Yes | Yes |
| Max CPU Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) |
Key Differentiators
- On-chip ECAN module with hardware filtering at 3.3 V (vs PIC18LF258T-I/SO)
- 80 KB FLASH and 3.25 KB RAM for protocol stacks (vs PIC18LF2680T-I/SO)
- LF low-voltage range (2.0 V - 3.6 V) vs F 5 V variant (vs PIC18F2682T-I/SO)
Design Notes
Estimated: At 40 MHz, 3.3 V, and active CPU core, the PIC18LF2682T-I/SO draws approximately 12-15 mA. Place a 100 nF decoupling capacitor directly adjacent to the VDD pin and a bulk 10 uF tantalum or ceramic on the supply rail within 1 cm of the IC. For battery-powered applications, switch to the internal 8 MHz or 32 kHz oscillator (OSCCON register) and use Sleep mode to reduce quiescent current to <1 uA. Use MCP1700 LDO for efficient 3.3 V regulation from a Li-ion cell.
The 28-SOIC wide-body (7.50 mm) provides 1.27 mm pin pitch. Route ICSP signals (PGC/PGD on RB6/RB7 and MCLR) to a 6-pin header for in-circuit programming; a 4.7 kohm pull-up on MCLR is mandatory for reliable Reset behavior. Place the ICSP header at the board edge for easy probe access. For CAN applications, keep the MCP2551 CAN transceiver within 50 mm of the ECAN pins and add a 120 ohm termination resistor at the bus endpoints. Decouple all VDD/VSS pairs individually with 100 nF ceramic.
Common pitfalls when designing with the PIC18LF2682T-I/SO include: (1) configuring CONFIG1L for the wrong voltage range (LF vs F), which disables brown-out reset; (2) forgetting to disable the internal MCLR if the pin is used as RE3 GPIO; (3) omitting the 100 nF decoupling capacitor on VDD, which causes spurious ADC readings; (4) using a slow VDD ramp without configuring the brown-out reset trip voltage, which can lead to undefined code execution on power-up. Always set the CONFIG bits in source code, not in MPLAB X at runtime, to ensure reproducible builds.
Estimated: For ADC accuracy, place the analog signal traces away from digital switching lines (PWM, SPI clock) by at least 3x trace width. Use a ground guard ring around analog inputs (RA0-RA5) tied to VSS. For ECAN bus, use twisted-pair cable with 120 ohm characteristic impedance and termination at both ends; the MCP2551 transceiver provides differential drive strength. Keep CAN bus traces short and avoid routing near switching power converters. Add a 100 nF bypass capacitor on VDD adjacent to the MCP2551 to suppress CAN bus glitches.
Compliance Information
RoHS and REACH compliant per Microchip product page. Industrial temperature grade -40 C to +85 C ("I" suffix); not AEC-Q100 automotive qualified. Choose PIC18F2682 with Q-suffix or PIC18F4685 family for AEC-Q100 automotive applications. MSL-1 per J-STD-020 with unlimited floor life at <=30 C/85% RH.
