PIC18F66J15-I/PT - 8-bit MCU 96KB Flash 40MHz 64-TQFP | Microchip
MPN: PIC18F66J15-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.51 | $6.51 |
| 10 | $5.83 | $58.30 |
| 100 | $5.1 | $510.00 |
| 500 | $4.62 | $2,310.00 |
| 1,000 | $4.2 | $4,200.00 |
PIC18F66J15-I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory (RAM), and configurable peripherals. The PIC18 family uses a RISC-based 8-bit core with a 16-bit instruction word that runs one instruction per four clock cycles. Within Microchip's hierarchy, the PIC18F66J15 sits in the mid-range flash tier above the PIC16 baseline and below the 16-bit PIC24/dsPIC families, making it the canonical choice for cost-sensitive embedded designs that require large memory and rich connectivity.
The device features a 10-bit ADC, multiple 16-bit timers, and parallel slave port. With 54 I/O pins and an internal 31 kHz to 8 MHz oscillator (PLL to 40 MHz), the part supports multiple operating modes and a wide peripheral mix. The 64-TQFP package with 10x10 mm body and 1 mm height provides ample I/O count for applications needing simultaneous connection to multiple sensors, displays, and communication buses.
Architecturally, the PIC18F66J15 uses a Harvard-style memory layout with separate program Flash and data paths, which lets the CPU fetch instructions while reading data in the same cycle. This dual-path design, combined with a 16-bit wide program bus, is the foundation of the family's throughput advantage over 8-bit CISC alternatives in C-language and interrupt-driven workloads.
Typical applications include industrial control panels, automotive body and climate subsystems (LIN slaves), home appliance user interfaces, point-of-sale terminals, and small graphical LCD controllers. In automotive body modules it acts as a LIN slave behind a master gateway; in consumer appliances it drives segmented or graphical LCDs while handling keypad scanning; and in industrial sensors it provides multi-protocol connectivity for SPI sensors, I²C EEPROM, and UART-modem interfaces.
When designing with this MCU, pay attention to supply voltage - the PIC18F66J15 family runs from 4.2V to 5.5V, which differs from the 2.0V-3.6V PIC18F46K22 family. Decouple VDD/VSS with 0.1 µF ceramics placed within a few millimetres of each pin pair to keep digital switching noise out of the ADC reference.
This page consolidates distributor pricing, pin-compatible alternatives from the same PIC18F87J10 family, and design guidance drawn from Microchip datasheets and reference designs, going beyond the raw datasheet to help engineers select and source the part quickly.
Drop-in alternatives for PIC18F66J15-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 PIC18F66J15-I/PT (same form factor and footprint) — differing in ADC, I/O Pins, MSL Level, Operating Temperature, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F66J15T-I/PT
✅ Drop-In✓ In Stock
$6.72 / Unit
View Datasheet →PIC18F66J10-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F66J11-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F66J50-I/PT
✅ Drop-In✓ In Stock
$5.05 / Unit
View Datasheet →PIC18F66J90-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F66J15-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Family | PIC18F87J10 |
| Program Memory (Flash) | 96 KB (48K x 16 words) |
| RAM | 4 KB |
| CPU Speed (max) | 40 MHz / 16 MIPS |
| Operating Voltage Range | 4.2 V to 5.5 V |
| I/O Pins | 54 |
| ADC | 10-bit, multiple channels |
| Timers | Multiple 8-bit and 16-bit timers |
| Serial Interfaces | 2x I²C/SPI, 2x UART (LIN-capable) |
| Package | TQFP-64 (PT), 10x10 mm, 1 mm height, MS-026 |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 °C to +85 °C (industrial) |
| MSL Level | 3 (per JEDEC J-STD-020) |
| Lead-Free / RoHS | Yes / Compliant |
PIC18F66J15-I/PT tqfp-64 (pt), 10x10 mm, 1 mm height, ms-026 Pin Configuration Guide
Pin configuration for PIC18F66J15-I/PT (tqfp-64 (pt), 10x10 mm, 1 mm height, ms-026 package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC18F66J15-I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC18F66J15-I/PT is suitable for 6 applications: Automotive Body Control Module (LIN Slave), Industrial Control Panel with Graphical LCD, Home Appliance User Interface Board, Point-of-Sale (POS) Terminal, Multi-Protocol Sensor Hub, Smart Meter and Energy Monitor.
Automotive Body Control Module (LIN Slave)
The PIC18F66J15-I/PT is well suited as a LIN 1.x/2.0 slave behind a master gateway in body-control modules for door locks, mirror adjusters, seat controllers, and climate panels. Its two LIN-capable EUSART modules handle auto-baud detection and break-character processing in hardware, offloading the 16 MIPS PIC18 core from bit-banging. The 96 KB flash comfortably fits a LIN state-machine plus a small RTOS or scheduler, and 54 I/O pins are enough to drive LEDs, read switches, and PWM motors in parallel. The 4.2 V to 5.5 V supply matches the automotive 12 V battery rail after a 5 V LDO. Operating temperature of -40 °C to +85 °C covers under-dash body electronics.
Recommended
Industrial Control Panel with Graphical LCD
In HMI panels driving monochrome or small color TFTs, the PIC18F66J15-I/PT provides 96 KB flash for a graphics library, 4 KB RAM for frame buffers, and enough I/O for keypads, encoders, and 4-20 mA sensor inputs. The PMP (parallel master port) peripheral interfaces to common LCD controllers such as the ST7565 or ILI9341, while two UARTs talk to RS-485 modbus slaves and an I²C bus reads temperature sensors. Compared with the PIC18F46K22, the 5 V operation simplifies analog signal conditioning for industrial 0-10 V inputs without level shifters.
Recommended
Home Appliance User Interface Board
Washing machines, dishwashers, ovens, and induction cooktops frequently use the PIC18F66J15-I/PT as the UI board MCU: it scans capacitive touch keys or mechanical keypads, drives 7-segment or dot-matrix displays, and communicates with the motor-inverter board via UART or LIN. The 5 V supply range matches legacy appliance power trees, and 54 I/O pins cover front-panel switches, indicator LEDs, rotary encoders, and buzzer PWM channels. Low-power sleep modes (down to nanoamps with RTCC running) extend standby battery life in clock-backed appliances.
Recommended
Point-of-Sale (POS) Terminal
POS terminals need a low-cost MCU to drive a small thermal printer, a 2x16 character LCD, a keypad, and a mag-stripe or NFC reader. The PIC18F66J15-I/PT fits in 64-TQFP and provides two UARTs (one for NFC reader, one for printer), an I²C port (EEPROM for transaction logs), and an SPI port (LCD or external flash). The 96 KB flash stores the menu tree, language tables, and printer font sets. Industrial temperature rating supports unheated indoor retail environments.
Recommended
Multi-Protocol Sensor Hub
The PIC18F66J15-I/PT acts as a sensor aggregator in industrial IoT edge nodes, reading SPI accelerometers, I²C pressure/temperature sensors, and UART GPS modules simultaneously, then forwarding data over UART, Modbus, or LIN to a gateway. The four serial ports (2x I²C/SPI + 2x UART) plus 54 I/O handle eight or more sensors concurrently. The 10-bit ADC is adequate for battery voltage monitoring and analog 4-20 mA inputs through a shunt resistor.
Recommended
Smart Meter and Energy Monitor
Single-phase smart electricity meters use the PIC18F66J15-I/PT for metrology and communications: a 10-bit ADC samples voltage/current shunts at 4 ksps, while one UART drives an optoisolated PLC modem and a second UART drives a wireless M-Bus or LoRaWAN module. The 96 KB flash holds the metrology algorithm (RMS, power factor, energy accumulation), the 4 KB RAM buffers measurement windows, and 54 I/O pins drive segmented LCDs, tamper switches, and relay outputs. Industrial temperature rating supports outdoor cabinet deployment.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F66J15-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F66J15T-I/PT | PIC18F66J10-I/PT | PIC18F66J11-I/PT | PIC18F66J50-I/PT | PIC18F66J90-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (PT) | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same | TQFP-64 (PT) - same |
| Flash Memory | 96 KB | 96 KB | 48 KB (-50%) | 96 KB (same) | 64 KB (-33%) | 32 KB (-67%) |
| RAM | 4 KB | 4 KB | 3.7 KB | 3.9 KB | 3.9 KB | 3 KB |
| CPU Speed (MIPS) | 16 MIPS @ 40 MHz | 16 MIPS @ 40 MHz | 16 MIPS @ 40 MHz | 16 MIPS @ 40 MHz | 12 MIPS @ 48 MHz | 16 MIPS @ 40 MHz |
| Operating 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 | 4.2 V to 5.5 V |
| I/O Pins | 54 | 54 | 54 | 54 | 51 | 54 |
| USB | No | No | No | No | Yes (FS USB 2.0 SIE) | No |
| LIN/UART | 2x LIN-capable UART | 2x LIN-capable UART | 2x LIN-capable UART | 2x LIN-capable UART | 2x LIN-capable UART | 1x UART (no LIN) |
Key Differentiators
- Highest flash in the PIC18F87J10 64-TQFP family (vs PIC18F66J10-I/PT)
- Two LIN-capable UARTs in 64-TQFP for body modules (vs PIC18F66J90-I/PT)
- Same 64-TQFP pinout across the J15 family (vs PIC18F66J50-I/PT)
Design Notes
Estimated: The PIC18F66J15-I/PT operates from 4.2 V to 5.5 V on VDD. Place one 0.1 µF X7R ceramic decoupling capacitor as close as possible (within 3 mm) to each VDD/VSS pin pair - the 64-TQFP has multiple VDD pins (typically 4-6) that all need decoupling. Add a bulk 10 µF tantalum or aluminium-polymer cap on the main 5 V rail near the MCU. For battery-backed or sleep-mode designs, the RTCC can run from a secondary supply through a small Schottky OR-ing diode to keep time-of-day while the main VDD is removed.
Route the 40 MHz system oscillator traces as short as possible and keep the crystal/oscillator body within 5 mm of the OSC1/OSC2 pins. Place a guard ring around the crystal traces tied to ground, since digital switching noise coupled into the oscillator pin will shift the 40 MHz reference and corrupt UART baud rates. For ADC accuracy, isolate AVdd/AVss pins and add a 10 µH ferrite bead + 10 µF cap filter on AVdd; this keeps digital switching noise out of the 10-bit ADC reference ladder.
Do not assume PIC18F 'J' family parts are 3.3 V compatible - the J family runs 4.2 V to 5.5 V, unlike the PIC18F 'K' or 'Q' families. Connecting a 3.3 V peripheral directly to a J-family GPIO will damage the J-family input. Use a level translator or migrate to a 'K' family part (e.g., PIC18F46K22) for 3.3 V designs. Also note the PIC18F66J15 has no internal 5 V tolerance on digital I/O - all I/O are 5 V only.
Estimated: At 40 MHz / 5 V with all peripherals active, the PIC18F66J15-I/PT typically draws 15-20 mA from VDD, dissipating 75-100 mW. With the 64-TQFP theta_JA around 50 °C/W (per JEDEC EIA/JESD51 4-layer test board), junction rise above ambient is only 4-5 °C. Thermal management is not a concern in normal operation, but high-IO drive or external bus-switching applications may benefit from increased copper pours on the 64-TQFP exposed paddle area (note: TQFP-64 in this family is non-EP, so power dissipation comes from the lead frame).
Compliance Information
RoHS and REACH compliance per Microchip product page. Industrial temperature grade -40C to +85C; AEC-Q100 automotive-qualified equivalent available separately from Microchip. Lead-free TQFP-64 package per JEDEC MS-026.
