PIC18F66J16-I/PT - 8-bit 48MHz 96KB Flash MCU | Microchip
MPN: PIC18F66J16-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.92 | $8.92 |
| 10 | $8.03 | $80.30 |
| 100 | $7.14 | $714.00 |
| 500 | $6.25 | $3,125.00 |
| 1,000 | $5.36 | $5,360.00 |
PIC18F66J16-I/PT Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, data memory, and programmable peripherals. The PIC18 family of MCUs from Microchip employs an enhanced Harvard architecture with 16-bit instructions and 8-bit data paths, balancing code density with execution efficiency. The 8-bit PIC MCU hierarchy proceeds: PIC10/12/16/18 -> PIC18 -> PIC18FxxJxx -> PIC18F87J11 family, with the J-series specifically designed for 3V and dual-voltage operation. Compared with 32-bit Cortex-M parts, 8-bit MCUs offer lower cost, simpler toolchains, and deterministic interrupt latency for motor control and human-interface applications.
Key features of the PIC18F66J16 include nanoWatt power management with multiple low-power sleep modes, an internal 8 MHz oscillator, hardware RTCC, a 10-bit ADC with up to 15 channels, two analog comparators, and an enhanced Flash program memory with word-write capability for EEPROM emulation. The four- serial-port design (2x MSSP for I2C/SPI, 2x EUSART for UART) targets designs requiring simultaneous communication to displays, sensors, and other microcontrollers.
The PIC18F66J16 belongs to the PIC18F87J11 family (which includes PIC18F66J11, PIC18F66J15, and PIC18F66J16 variants) sharing the same peripheral set, pinout, and 64/80-pin TQFP package options. The I/PT industrial-grade variant operates across -40C to +85C, supports 2.0V to 3.6V core voltage (with 5V-tolerant I/O via internal level shifters in selected configurations), and is supplied in industrial temperature grade. The 448-page datasheet documents instruction set, peripheral operation, and timing characteristics.
Typical applications include industrial control panels, USB-to-UART bridges, sensor hubs, low-power embedded displays, and 3V battery-powered sensor nodes. Its combination of 96 KB Flash and four serial channels makes it well-suited to gateway and protocol-bridge designs.
When designing with the PIC18F66J16, ensure that the supply rail stays within the 2.0V-3.6V core range and confirm that your in-circuit debugger (ICD 3, PICkit 4, MPLAB Snap) supports this device revision before committing to firmware.
This page synthesizes distributor pricing, drop-in alternatives, and design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F66J16-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 PIC18F66J16-I/PT (same form factor and footprint) — differing in Operating Temperature, Package, I/O Pins, Program Memory (Flash), MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F66J15-I/PT
✅ Drop-In✓ In Stock
$4.2 / Unit
View Datasheet →PIC18F66J15T-I/PT
✅ Drop-In✓ In Stock
$6.72 / Unit
View Datasheet →PIC18F66J11T-I/PT
✅ Drop-In✓ In Stock
$4.61 / Unit
View Datasheet →PIC18F66J16-I/PT Maximum Ratings & Electrical Characteristics
| Core | PIC18 (8-bit RISC) |
| Program Memory (Flash) | 96 KB (48K x 16) |
| Data RAM | 3936 bytes |
| Maximum CPU Speed | 48 MHz |
| Performance (MIPS) | 10 MIPS |
| Operating Voltage (Core) | 2.0 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Digital I/O Pins | 51 (per Mouser listing) |
| I/O Ports | 54 (per Digchip listing) |
| UART / EUSART | 2 |
| Synchronous Serial Ports (MSSP / I2C / SPI) | 2 |
| Internal Oscillator | 8 MHz |
| Package | TQFP-64 (PT) 10x10 mm |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC18F66J16-I/PT Pin Configuration
| Pin 1 | RC0 — Digital I/O / analog input |
| Pin 2 | RC1 — Digital I/O / analog input |
| Pin 3 | RC2 — Digital I/O / analog input |
| Pin 4 | RC3 — Digital I/O / analog input |
| Pin 5 | RC4 — Digital I/O / analog input |
| Pin 6 | RC5 — Digital I/O / analog input |
| Pin 7 | RC6 — Digital I/O / TX2 |
| Pin 8 | RC7 — Digital I/O / RX2 |
| Pin 9 | RE0 — Digital I/O |
| Pin 10 | RE1 — Digital I/O |
| Pin 11 | RE2 — Digital I/O |
| Pin 12 | RE3 — Digital I/O |
| Pin 13 | RE4 — Digital I/O |
| Pin 14 | RE5 — Digital I/O |
| Pin 15 | RE6 — Digital I/O |
| Pin 16 | RE7 — Digital I/O |
| Pin 17 | VDD — Positive supply (2.0-3.6V) |
| Pin 18 | VSS — Ground |
| Pin 19 | RA0 — Digital I/O / analog input |
| Pin 20 | RA1 — Digital I/O / analog input |
| Pin 21 | RA2 — Digital I/O / analog input |
| Pin 22 | RA3 — Digital I/O / analog input |
| Pin 23 | RA4 — Digital I/O / analog input |
| Pin 24 | RA5 — Digital I/O / analog input |
| Pin 25 | RA6 — Digital I/O / oscillator |
| Pin 26 | RA7 — Digital I/O / oscillator |
| Pin 27 | VSS — Ground |
| Pin 28 | VDD — Positive supply |
| Pin 29 | RB0 — Digital I/O / interrupt-on-change |
| Pin 30 | RB1 — Digital I/O / interrupt-on-change |
| Pin 31 | RB2 — Digital I/O / interrupt-on-change |
| Pin 32 | RB3 — Digital I/O / interrupt-on-change |
| Pin 33 | RB4 — Digital I/O / interrupt-on-change |
| Pin 34 | RB5 — Digital I/O / interrupt-on-change |
| Pin 35 | RB6 — Digital I/O / PGC (debug) |
| Pin 36 | RB7 — Digital I/O / PGD (debug) |
| Pin 37 | RD0 — Digital I/O |
| Pin 38 | RD1 — Digital I/O |
| Pin 39 | RD2 — Digital I/O |
| Pin 40 | RD3 — Digital I/O |
| Pin 41 | RD4 — Digital I/O |
| Pin 42 | RD5 — Digital I/O |
| Pin 43 | RD6 — Digital I/O |
| Pin 44 | RD7 — Digital I/O |
| Pin 45 | VSS — Ground |
| Pin 46 | VDD — Positive supply |
| Pin 47 | RF0 — Digital I/O |
| Pin 48 | RF1 — Digital I/O |
| Pin 49 | RF2 — Digital I/O |
| Pin 50 | RF3 — Digital I/O |
| Pin 51 | RF4 — Digital I/O |
| Pin 52 | RF5 — Digital I/O |
| Pin 53 | RF6 — Digital I/O |
| Pin 54 | RF7 — Digital I/O |
| Pin 55 | RG0 — Digital I/O |
| Pin 56 | RG1 — Digital I/O |
| Pin 57 | RG2 — Digital I/O |
| Pin 58 | RG3 — Digital I/O |
| Pin 59 | RG4 — Digital I/O |
| Pin 60 | MCLR — Master Clear / reset (active low) |
| Pin 61 | OSC1 — Crystal oscillator input |
| Pin 62 | OSC2 — Crystal oscillator output |
| Pin 63 | VSS — Ground |
| Pin 64 | VDD — Positive supply |
Typical Applications
PIC18F66J16-I/PT is suitable for 7 applications: Industrial Control Panel HMI, USB-to-UART Protocol Bridge, Multi-Sensor Data Logger, Low-Power Wireless Sensor Node, Automotive Body Comfort Module, Embedded Display Controller, Medical Device Sub-System.
Industrial Control Panel HMI
The PIC18F66J16-I/PT fits industrial HMI panels that need reliable multi-port serial connectivity for display, keypad, and downstream sensors. With 51 GPIO, 2 UART, and 2 I2C/SPI ports, the MCU can drive an LCD or character display via SPI while polling I2C sensors and bridging to a PLC via UART, all from a single 3V rail. The 96 KB Flash accommodates rich menu logic and self-test routines. The 10-bit ADC supports analog keypad or resistive touch overlay sampling.
Recommended
USB-to-UART Protocol Bridge
The PIC18F66J16-I/PT serves as the bridge controller between an MCP2200 USB-UART transceiver and downstream UART peripherals. With 2 hardware EUSART ports running at up to 5 Mbps, the MCU can simultaneously handle a host-facing link and a field-bus connection while passing data through internal DMA-free FIFOs. The 48 MHz core and 3936-byte RAM sustain 1 ms latency response. Cost-sensitive 3V industrial designs use the J16 to consolidate logic that would otherwise need an external bridge ASIC.
Recommended
Multi-Sensor Data Logger
The PIC18F66J16-I/PT is well-suited to battery-powered multi-sensor loggers that stream via I2C and SPI. Its nanoWatt sleep modes drop quiescent current to microamp levels between sensor reads, while 96 KB Flash stores weeks of timestamped data. The dual MSSP ports allow simultaneous I2C sensor and SPI flash memory access without contention. Industrial temperature grade -40 C to +85 C supports outdoor deployment.
Recommended
Low-Power Wireless Sensor Node
The PIC18F66J16-I/PT controls a sub-GHz transceiver (such as MRF89XA) over SPI, gathering sensor data and managing the radio duty cycle. The internal 8 MHz oscillator eliminates an external crystal for many applications, reducing BOM cost. The 3.6V max supply matches Li-ion chemistries directly. nanoWatt sleep current extends battery life to months in intermittent-reporting applications.
Recommended
Automotive Body Comfort Module
The PIC18F66J16-I/PT handles non-safety automotive comfort functions such as ambient lighting control, mirror positioning, and seat memory. Its 4 serial ports (2x UART, 2x I2C/SPI) connect to multiple LIN sub-nodes and I2C actuators. Designers typically upgrade to AEC-Q100 qualified parts for under-hood applications, but cabin modules can use the industrial-grade J16 with appropriate derating.
Recommended
Embedded Display Controller
The PIC18F66J16-I/PT drives character and small graphic OLED/LCD displays via SPI or parallel interface, with enough GPIO to scan a 4x4 keypad matrix. The 10-bit ADC digitizes battery voltage for on-screen status indication. 96 KB Flash supports multi-language fonts and bitmaps. The 48 MHz core renders animated icons without flicker at 30 fps.
Recommended
Medical Device Sub-System
The PIC18F66J16-I/PT serves as a peripheral controller in non-life-critical medical devices such as patient monitors or infusion pumps. Its deterministic 8-bit core and hardware interrupts ensure precise timing for sensor sampling. Designers use the J16 for keypad handling, display drive, and alarm logic while a higher-end processor handles main diagnostics. Industrial temperature grade and nanoWatt sleep are beneficial for portable applications.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F66J16-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F66J15-I/PT | PIC18F66J15T-I/PT | PIC18F66J11T-I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (PT) 10x10 mm | TQFP-64 (PT) 10x10 mm - same | TQFP-64 (PT) 10x10 mm - same | TQFP-64 (PT) 10x10 mm - same |
| Program Memory (Flash) | 96 KB | 64 KB (-33%) | 64 KB (-33%) | 64 KB (-33%) |
| Data RAM | 3936 bytes | 3936 bytes | 3936 bytes | 3936 bytes |
| Maximum CPU Speed | 48 MHz (10 MIPS) | 48 MHz (10 MIPS) | 48 MHz (10 MIPS) | 48 MHz (10 MIPS) |
| Operating Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V |
| Internal 8 MHz Oscillator (enhanced) | Yes | Yes | Yes | No (base variant) |
| Improved EEPROM Emulation | Yes (word Flash write) | No (older emulation) | No (older emulation) | No |
| Temperature Grade | Industrial (-40 C to +85 C) | Industrial | Industrial | Industrial |
Key Differentiators
- Highest Flash density in the PIC18F66Jxx 64-pin family (vs PIC18F66J15-I/PT)
- Word-write Flash for native EEPROM emulation (vs PIC18F66J11T-I/PT)
- Enhanced nanoWatt power management with internal 8 MHz oscillator (vs PIC18F66J11T-I/PT)
Design Notes
Estimated: at 48 MHz the PIC18F66J16-I/PT draws approximately 12-15 mA active from a 3.3V supply, while nanoWatt sleep drops this below 1 uA. Use a 100 nF decoupling cap on every VDD/VSS pair (4 pairs on the TQFP-64 package), plus a bulk 10 uF tantalum near the IC. For battery applications, gate peripheral power with a MOSFET driven by an MCU GPIO to reduce system quiescent current below the MCU's own sleep floor.
The TQFP-64 (PT) 10x10 mm package has 0.5 mm pitch leads - use 0.25 mm trace width with 0.2 mm spacing and a 4-layer PCB with continuous ground plane under the IC for noise isolation. Place the crystal within 5 mm of OSC1/OSC2 (pins 61/62) and surround the crystal traces with a ground guard ring. MCLR (pin 60) requires a 10 kohm pull-up to VDD for normal operation.
Do not exceed the 3.6V absolute maximum on any pin - the J-series core is NOT 5V tolerant in all configurations. Use MCP1700 or similar LDO to regulate from 5V systems. The internal 8 MHz oscillator has a +/- 2% tolerance, insufficient for UART communication without calibration - use an external crystal for serial applications, or enable the FPLL for high-precision timing.
Route ICSP signals PGC (RB6, pin 35) and PGD (RB7, pin 36) to an in-circuit debug header with series 100 ohm resistors to prevent EMI coupling into nearby analog traces. If using both ICSP and the RB6/RB7 GPIOs in the application, place resistors so the ICSP header can be isolated during normal operation.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC18F46J50 or other automotive-grade parts for vehicle applications.
