PIC18F6680T-I/PT - 64KB Flash 40MHz 8-bit MCU | Microchip
MPN: PIC18F6680T-I/PT ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.27 | $11.27 |
| 10 | $10.14 | $101.40 |
| 100 | $9.04 | $904.00 |
| 500 | $7.83 | $3,915.00 |
| 1,000 | $7.04 | $7,040.00 |
PIC18F6680T-I/PT Overview
What is an 8-bit PIC microcontroller? An 8-bit microcontroller is a small computer-on-chip that processes data in 8-bit chunks and integrates CPU, RAM, non-volatile program memory, and peripherals into one IC. The PIC18F family sits in the upper tier of Microchip's 8-bit portfolio, using an enhanced Harvard RISC architecture with 16-bit instructions that deliver up to 10 MIPS at 40 MHz. Microcontroller families like PIC18F sit below 16-bit dsPIC and 32-bit PIC32 in Microchip's hierarchy, but they remain widely used for cost-sensitive, deterministic, low-power embedded designs because of their mature toolchain, IEC 60730 Class B compliance support, and broad peripheral integration.
Key features include nanoWatt technology for power-managed sleep modes, an Enhanced Capture/Compare/PWM (ECCP) module, two USART ports, an I2C/SPI peripheral, two PWM modules, and up to 52 digital I/O lines. The 'T' suffix indicates tape-and-reel packaging, 'I' denotes the industrial -40C to +85C temperature range, and 'PT' is Microchip's package designator for 64-pin TQFP.
Architecturally, the PIC18F6680 uses a 16-bit program path with an 8-bit data path, 31-level hardware stack, and hardware multiplier. The integrated CAN 2.0B and USB 2.0 (full speed) make it well-suited for industrial networking bridges where two wired protocols coexist alongside general-purpose I/O and ADC channels.
Typical applications include industrial automation nodes, automotive body and HVAC controllers (with the AEC-Q100 PIC18F6680T-I/PTVAO equivalent), USB-to-CAN bridges, building automation sensor hubs, and embedded control panels that require deterministic 8-bit performance without stepping up to a 32-bit MCU. When migrating from legacy PIC18 designs, the PT-package footprint is shared with PIC18F8585/6680/6585/8680 family members, easing PCB reuse.
Drop-in alternatives for PIC18F6680T-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 PIC18F6680T-I/PT (same form factor and footprint) — differing in ADC, Package, Capture/Compare/PWM, Core Architecture, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F6680-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F6585-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F8585-I/PT
✅ Drop-In✓ In Stock
$11.05 / Unit
View Datasheet →PIC18F8680-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F67J10-I/PT
✅ Drop-In✓ In Stock
$5.4 / Unit
View Datasheet →PIC18F65K80-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F6680T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit (Harvard RISC) |
| Series | PIC18F |
| Program Memory Size | 64 KB (32K x 16) Flash |
| RAM Size | 3,328 bytes |
| EEPROM Size | 1 KB |
| Maximum Clock Speed | 40 MHz (10 MIPS) |
| Supply Voltage Range | 4.2 V to 5.5 V |
| Operating Temperature Range | -40 C to +85 C (Industrial, 'I') |
| I/O Pins | 52 (per Hotenda/Partstack summary) |
| ADC | 12-channel, 10-bit |
| Communication Interfaces | USB 2.0 FS, CAN 2.0B, 2x USART, I2C, SPI |
| PWM Modules | 2 (CCP + Enhanced CCP) |
| Analog Comparators | 2 |
| Timers | 4 x 8/16-bit |
| Package | 64-pin TQFP (PT), 10 x 10 x 1 mm |
| Mounting Type | Surface Mount |
| MSL Level | 3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Recommended for Automotive | Yes (special ordering codes) |
PIC18F6680T-I/PT Pin Configuration
| Pin 1 | MCLR/RE3 — Master Clear (input) or digital I/O 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 / AN2 / negative voltage reference |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / AN3 / positive voltage reference |
| Pin 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock / Comparator 1 output |
| Pin 7 | RA5/AN4/SS/C2OUT — PORTA bit 5 / AN4 / SPI slave select / Comparator 2 output |
| Pin 8 | AVDD — Analog power supply |
| Pin 9 | AVSS — Analog ground |
| Pin 10 | RB0/AN10/FLT0 — PORTB bit 0 / analog / PWM fault |
| Pin 11 | RB1/AN8 — PORTB bit 1 / AN8 |
| Pin 12 | RB2/AN9 — PORTB bit 2 / AN9 |
| Pin 13 | RB3/AN11 — PORTB bit 3 / AN11 |
| Pin 14 | RB4 — PORTB bit 4 |
| Pin 15 | RB5 — PORTB bit 5 |
| Pin 16 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 17 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 18 | VUSB — USB transceiver internal power input |
| Pin 19 | RC0/T1OSO/T13CKI — PORTC bit 0 / Timer1 oscillator out |
| Pin 20 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Pin 21 | RC2/CCP1 — PORTC bit 2 / Enhanced CCP1 |
| Pin 22 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 25 | RC6/TX1/CK1 — PORTC bit 6 / USART1 transmit |
| Pin 26 | RC7/RX1/DT1 — PORTC bit 7 / USART1 receive |
| Pin 27 | VSS — Ground reference |
| Pin 28 | VDD — Digital power supply |
| Pin 29 | D-/RB0 — USB D- / shared PORTB bit 0 |
| Pin 30 | D+/RB1 — USB D+ / shared PORTB bit 1 |
| Pin 31 | RE0/RD — PORTE bit 0 / parallel port read |
| Pin 32 | RE1/WR — PORTE bit 1 / parallel port write |
| Pin 33 | RE2/CS — PORTE bit 2 / external memory chip select |
| Pin 34 | OSC1/CLKI/RA7 — Crystal input / clock in / RA7 |
| Pin 35 | OSC2/CLKO/RA6 — Crystal output / clock out / RA6 |
| Pin 36 | RD0 — PORTD bit 0 |
| Pin 37 | RD1 — PORTD bit 1 |
| Pin 38 | RD2 — PORTD bit 2 |
| Pin 39 | RD3 — PORTD bit 3 |
| Pin 40 | RD4 — PORTD bit 4 |
| Pin 41 | RD5 — PORTD bit 5 |
| Pin 42 | RD6 — PORTD bit 6 |
| Pin 43 | RD7 — PORTD bit 7 |
| Pin 44 | CANRX — CAN bus receive pin |
| Pin 45 | CANTX — CAN bus transmit pin |
| Pin 46 | RF0 — PORTF bit 0 |
| Pin 47 | RF1 — PORTF bit 1 |
| Pin 48 | RF2 — PORTF bit 2 |
| Pin 49 | RF3 — PORTF bit 3 |
| Pin 50 | RF4 — PORTF bit 4 |
| Pin 51 | RF5 — PORTF bit 5 |
| Pin 52 | RF6 — PORTF bit 6 |
| Pin 53 | RF7 — PORTF bit 7 |
| Pin 54 | RG0 — PORTG bit 0 |
| Pin 55 | RG1 — PORTG bit 1 |
| Pin 56 | RG2 — PORTG bit 2 |
| Pin 57 | RG3 — PORTG bit 3 |
| Pin 58 | RG4 — PORTG bit 4 |
| Pin 59 | RG5 — PORTG bit 5 |
| Pin 60 | RG6 — PORTG bit 6 |
| Pin 61 | RG7 — PORTG bit 7 |
| Pin 62 | RH0 — PORTH bit 0 |
| Pin 63 | RH1 — PORTH bit 1 |
| Pin 64 | RH2 — PORTH bit 2 / external interrupt |
Typical Applications
PIC18F6680T-I/PT is suitable for 6 applications: Industrial CAN Node, USB-to-CAN Bridge, Automotive Body Control Module, Building Automation Sensor Hub, Embedded Control Panel HMI, Legacy Firmware Replacement Design.
Industrial CAN Node
The PIC18F6680T-I/PT's integrated CAN 2.0B controller and 5V supply tolerance make it a fit for industrial CANopen and DeviceNet slave nodes mounted on factory floors. Its 52 digital I/O lines drive digital sensors, optocouplers, and relay outputs without external bus expanders, while the 12-channel 10-bit ADC reads analog process variables such as 4-20 mA loopbacks at 5V directly. Compared to a 32-bit ARM-Cortex part, the 8-bit PIC core offers deterministic interrupt latency needed for time-triggered CAN protocols. Use the ECCP module to generate a hardware time base for CANopen sync messages and rely on the watchdog timer for IEC 60730 compliance on industrial equipment. The wide -40C to +85C industrial range covers most factory cabinet environments without derating.
Recommended
USB-to-CAN Bridge
The combination of USB 2.0 full-speed (12 Mbps) and CAN 2.0B on a single die makes the PIC18F6680T-I/PT a natural choice for service tools, panel PCs, and industrial gateway bridges that translate USB packets to/from CAN frames. The 64 KB Flash comfortably stores the USB CDC and CAN bootloader, while 3,328 bytes of RAM is sufficient for buffering typical 8-byte CAN payloads at line rate. The 40 MHz (10 MIPS) core executes the USB protocol layer and CAN arbitration with tight timing margins. Drop this IC between a host USB port and a CAN bus on the production line for diagnostics or firmware update channels; many commercial USB-to-CAN adapters are built around exactly this PIC family.
Recommended
Automotive Body Control Module
The Microchip product page explicitly marks the PIC18F6680 family as recommended for automotive design, with special ordering codes applying for AEC-Q100 qualification. The 5V rails match legacy body and HVAC actuators that have not yet migrated to 12V-tolerant ECU rails, while the 40 MHz instruction throughput serves polled body-control loops driving window lifts, mirror adjusters, and seat controllers. The 1 KB EEPROM holds calibration and customer-option data through battery disconnects, and nanoWatt sleep modes cut quiescent draw to a few microamps for parked-vehicle quiescent-current budgets. Choose the automotive-grade ordering code rather than the 'I' industrial grade when targeting infotainment gateways and HVAC modules.
Recommended
Building Automation Sensor Hub
Building automation panels aggregate sensors and actuators over multiple wired buses. The PIC18F6680T-I/PT supplies the integrated USB service port, CAN backbone, USART for RS-485 building networks, and I2C/SPI for digital sensors and HVAC peripherals in a single 64-pin TQFP footprint. Its 12-channel 10-bit ADC handles mixed analog inputs such as thermistor ladders, light sensors, and potentiometer setpoints, while the ECCP module dims 0-10 V lighting controls via a PWM-to-voltage filter. With 64 KB of Flash, the firmware can host a BACnet or Modbus stack alongside sensor processing without external memory. The industrial -40C to +85C rating covers unconditioned mechanical rooms and rooftop controllers.
Recommended
Embedded Control Panel HMI
Human-machine interface panels need a deterministic 8-bit MCU to scan key matrices, drive character LCDs, and refresh status LEDs without jitter. The PIC18F6680T-I/PT provides 52 I/O lines sufficient for 8x8 keyboards and 16-segment alphanumeric displays simultaneously, while the two PWM modules dim backlights and status LEDs. The ICSP programming interface allows firmware updates in the field without removing the panel, and the 64 KB Flash region stores multilingual strings plus graphical assets for ST7066 displays. Pair this MCU with an external character LCD controller or OLED driver over SPI for compact operator panels used in machinery, kiosks, and laboratory instruments.
Recommended
Legacy Firmware Replacement Design
Engineers maintaining older 5V PIC18F designs find the PIC18F6680T-I/PT a transparent replacement when migrating from PIC18F458 or PIC18F2680 boards. Identical register layout, identical peripheral addresses, and an identical 64-pin TQFP package mean existing PCB layouts and firmware drop in without modifications. The 40 MHz / 10 MIPS performance headroom absorbs feature creep without overclocking, and the larger 64 KB Flash extends the life of code bases that have outgrown 32 KB parts. NanoWatt sleep modes also help retrofit battery-backed designs that previously required external RTC chips, reducing bill-of-materials cost.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F6680T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F6680-I/PT | PIC18F6585-I/PT | PIC18F8585-I/PT | PIC18F8680-I/PT | PIC18F67J10-I/PT | PIC18F65K80-I/PT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (PT), 10x10 mm | TQFP-64 (PT) - same footprint | TQFP-64 (PT) - same footprint | TQFP-64 (PT) - same footprint | TQFP-64 (PT) - same footprint | TQFP-64 (PT) - same footprint | TQFP-64 (PT) - same footprint |
| Flash Memory | 64 KB | 64 KB | 48 KB (-25%) | 48 KB (-25%) | 64 KB | 32 KB (-50%) | 64 KB |
| RAM | 3,328 B | 3,328 B | 3,328 B | 3,328 B | 3,328 B | 2,048 B (-38%) | 3,568 B (+7%) |
| Max Clock Speed | 40 MHz (10 MIPS) | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 64 MHz (F parts) |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 3.6 V (different rail) | 1.8 V to 5.5 V (wide) |
| CAN 2.0B | Yes | Yes | No | No | Yes | Yes | Yes |
| USB FS | Yes | Yes | No | No | Yes | No | No |
| Lifecycle Status | Last Time Buy / Not Recommended for new designs | Last Time Buy | NRND | NRND | NRND | Active | Active |
| Automotive Recommended | Yes (special ordering codes) | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated USB 2.0 FS plus CAN 2.0B on a single 5V PIC18F die (vs PIC18F67J10-I/PT)
- Larger Flash and RAM than the PIC18F6585 sibling (vs PIC18F6585-I/PT)
- Deterministic 8-bit RISC core with zero pipeline stalls (vs PIC18F65K80-I/PT)
Design Notes
The PIC18F6680T-I/PT must be supplied from a regulated 5V rail within 4.2V to 5.5V. Decouple VDD with a 100 nF X7R ceramic placed within 5 mm of the VDD/VSS pins and bulk with a 10 uF tantalum or aluminum-polymer capacitor. For USB applications, bias the internal 3.3V USB transceiver through VUSB and a decoupling network per the datasheet's USB section. Adding a ferrite bead to AVDD may improve ADC noise immunity when sampling low-level analog signals.
Estimated thermal dissipation at 40 MHz, 5V, active mode is approximately 75 mW; in sleep mode it falls below 1 uA typical. The 64-pin TQFP package has a theta_JA around 50 C/W on a JEDEC 4-layer test board, so junction temperature rise is typically below 4 C at room ambient. Standard PCB layouts do not need a heatsink, but designers should still respect the recommended 1 oz copper 2-layer minimum to stay within the industrial -40C to +85C spec.
Lay out the crystal traces between OSC1 and OSC2 as short as possible and surround them with a ground ring for EMI suppression. Traces for the USB D+/D- lines must be matched within 2 mm and routed over an unbroken reference plane to meet USB 2.0 full-speed signal-integrity rules. CANH and CANL lines should be routed as a differential pair with 120-ohm characteristic impedance for reliable CAN bus operation up to 1 Mbps.
Do not connect MCLR directly to VDD without a 10 kohm pull-up; ICSP programming requires the MCLR signal to be pulled low through a 470-ohm resistor and dedicated header. Ensure that PGC and PGD lines are isolated from high-speed switching nodes (PWM, CCP) to avoid programming glitches. When converting a 5V PIC18F6680 design to a 3.3V PIC18F67J10 or PIC18F65K80 replacement, verify that logic-level shifters are in place for any 5V peripherals on shared lines.
Compliance Information
RoHS and REACH compliant per LCSC and DigiKey product listings. AEC-Q100 qualification available via special automotive ordering codes per the Microchip product page. Standard 'I' grade is industrial -40C to +85C and is NOT qualified as automotive-grade unless the VAO suffix is requested.
