PIC18F66J15T-I/PT - 40MHz 8-bit MCU 96KB Flash | Microchip
MPN: PIC18F66J15T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.2 | $11.20 |
| 10 | $10.08 | $100.80 |
| 100 | $8.96 | $896.00 |
| 500 | $7.84 | $3,920.00 |
| 1,000 | $6.72 | $6,720.00 |
PIC18F66J15T-I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, Flash program memory, RAM, peripherals (timers, ADC, communication ports), and I/O on one die. The PIC18 family extends Microchip's baseline PIC16 architecture with 16-bit wide instructions, a wider datapath, and richer peripherals while preserving the same RISC-style instruction set. Within the hierarchy: PIC18J sub-family -> PIC18 family -> 8-bit MCU -> microcontroller -> embedded controller -> semiconductor. The PIC18J series uses a 2.5V-3.6V core with a separate 4.2V-5.5V I/O supply via internal regulators, simplifying 5V-tolerant designs.
Key features of this device include four serial ports (two MSSP for I2C/SPI plus two enhanced USARTs with LIN support), a 10-bit ADC with up to 15 channels, two CCP/ECCP modules, an 8-bit parallel port, and CTMU for capacitive touch. The 64-pin TQFP exposes 50+ general-purpose I/O pins, ideal for human-interface or sensor-hub boards where GPIO count matters.
Architecturally, the PIC18J core uses a 16-bit instruction word with single-cycle execution for most opcodes (200 ns at 40 MHz), Harvard memory architecture with separate program Flash and data SRAM buses, and Microchip's nanoWatt XLP-style low-power modes. The internal 2.5V regulator allows the digital core to operate from a single 5V rail.
Typical applications include USB/connectivity bridges, industrial control panels, LIN-based automotive body controllers, capacitive touch keypads, low-cost instrumentation, and embedded display drivers. The 96 KB Flash comfortably holds USB stacks, bootloader+application partitions, or graphical display firmware.
Design trade-off: choose PIC18J when 5V I/O tolerance, large Flash, and high GPIO count are priorities; choose PIC24/dsPIC or PIC18 K-series when higher CPU throughput (16 MIPS+), lower core voltage, or 1.8V operation are required.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical design notes that supplement the manufacturer datasheet.
Drop-in alternatives for PIC18F66J15T-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 PIC18F66J15T-I/PT (same form factor and footprint) — differing in Package, ADC, I/O Pins, Operating Temperature, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F66J15-I/PT
✅ Drop-In✓ In Stock
$4.2 / Unit
View Datasheet →PIC18F67J10-I/PT
✅ Drop-In✓ In Stock
$5.4 / Unit
View Datasheet →PIC18F86J15-I/PT
✅ Drop-In✓ In Stock
$5.32 / Unit
View Datasheet →PIC18F66J11T-I/PT
✅ Drop-In✓ In Stock
$4.61 / Unit
View Datasheet →PIC18F66J10-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F6680T-I/PT
✅ Drop-In✓ In Stock
$7.04 / Unit
View Datasheet →PIC18F66J15T-I/PT Maximum Ratings & Electrical Characteristics
| Family | PIC18J (PIC18F87J10 family) |
| Core | 8-bit PIC RISC |
| Program Memory (Flash) | 96 KB (48K x 16) |
| RAM | 4 KB |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| Core Voltage | 2.5 V (internal regulator) |
| I/O Pins | 50 |
| Pin Count | 64 |
| Package | 64-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (Industrial) |
| Packing Media | Tape & Reel (1200 per reel) |
| Serial Ports | 2x MSSP (I2C/SPI) + 2x EUSART (LIN-capable) |
| ADC | 10-bit, up to 15 channels |
| Capture/Compare/PWM | 2x CCP + 2x ECCP |
| RoHS Status | Compliant |
| MSL Level | 3 |
| Country of Origin | Thailand |
| Lifecycle Status | Active |
PIC18F66J15T-I/PT Pin Configuration
| Pin 1 | RG7 — I/O port G bit 7 |
| Pin 2 | RG6 — I/O port G bit 6 |
| Pin 3 | RG5 — I/O port G bit 5 |
| Pin 4 | RG4 — I/O port G bit 4 |
| Pin 5 | RG3 — I/O port G bit 3 |
| Pin 6 | RG2 — I/O port G bit 2 |
| Pin 7 | RC1 — I/O port C bit 1 / CCP2 |
| Pin 8 | RC0 — I/O port C bit 0 |
| Pin 9 | RC6 — I/O port C bit 6 / TX1 |
| Pin 10 | RC7 — I/O port C bit 7 / RX1 |
| Pin 11 | RB7 — I/O port B bit 7 |
| Pin 12 | RB6 — I/O port B bit 6 / PGC |
| Pin 13 | RB5 — I/O port B bit 5 / PGD |
| Pin 14 | RB4 — I/O port B bit 4 |
| Pin 15 | RB3 — I/O port B bit 3 |
| Pin 16 | RB2 — I/O port B bit 2 |
| Pin 17 | RB1 — I/O port B bit 1 |
| Pin 18 | RB0 — I/O port B bit 0 / INT0 |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Positive supply 4.2V-5.5V |
| Pin 21 | RD7 — I/O port D bit 7 |
| Pin 22 | RD6 — I/O port D bit 6 |
| Pin 23 | RD5 — I/O port D bit 5 |
| Pin 24 | RD4 — I/O port D bit 4 |
| Pin 25 | RC2 — I/O port C bit 2 |
| Pin 26 | RC3 — I/O port C bit 3 / SCL |
| Pin 27 | RC4 — I/O port C bit 4 / SDA |
| Pin 28 | RC5 — I/O port C bit 5 / SDO |
| Pin 29 | RD0 — I/O port D bit 0 |
| Pin 30 | RD1 — I/O port D bit 1 |
| Pin 31 | RD2 — I/O port D bit 2 |
| Pin 32 | RD3 — I/O port D bit 3 |
| Pin 33 | VSS — Ground |
| Pin 34 | VDD — Positive supply 4.2V-5.5V |
| Pin 35 | RA15 — I/O port A bit 15 |
| Pin 36 | RA14 — I/O port A bit 14 |
| Pin 37 | RA13 — I/O port A bit 13 |
| Pin 38 | RA12 — I/O port A bit 12 |
| Pin 39 | RA11 — I/O port A bit 11 |
| Pin 40 | RA10 — I/O port A bit 10 |
| Pin 41 | RA9 — I/O port A bit 9 |
| Pin 42 | RA8 — I/O port A bit 8 |
| Pin 43 | RA7 — I/O port A bit 7 |
| Pin 44 | RA6 — I/O port A bit 6 |
| Pin 45 | RA5 — I/O port A bit 5 |
| Pin 46 | RA4 — I/O port A bit 4 |
| Pin 47 | RA3 — I/O port A bit 3 |
| Pin 48 | RA2 — I/O port A bit 2 |
| Pin 49 | RA1 — I/O port A bit 1 |
| Pin 50 | RA0 — I/O port A bit 0 |
| Pin 51 | VSS — Ground |
| Pin 52 | VDD — Positive supply 4.2V-5.5V |
| Pin 53 | RE7 — I/O port E bit 7 |
| Pin 54 | RE6 — I/O port E bit 6 |
| Pin 55 | RE5 — I/O port E bit 5 |
| Pin 56 | RE4 — I/O port E bit 4 |
| Pin 57 | RE3 — I/O port E bit 3 |
| Pin 58 | RE2 — I/O port E bit 2 |
| Pin 59 | RE1 — I/O port E bit 1 |
| Pin 60 | RE0 — I/O port E bit 0 |
| Pin 61 | VSS — Ground |
| Pin 62 | VDD — Positive supply 4.2V-5.5V |
| Pin 63 | RF7 — I/O port F bit 7 |
| Pin 64 | RF6 — I/O port F bit 6 |
Typical Applications
PIC18F66J15T-I/PT is suitable for 6 applications: Industrial Control Panel, Automotive LIN Body Controller, Capacitive Touch Keypad, USB HID / CDC Bridge, Embedded Display Driver, Low-Cost Instrumentation.
Industrial Control Panel
The PIC18F66J15T-I/PT's 50 I/O pins and 96 KB Flash make it well-suited for industrial control panels driving segmented LCDs, keypads, and multiple sensor inputs. The device supports 4.2V-5.5V supply, allowing direct interface to 5V logic level sensors and backlit displays without level shifters. The two EUSARTs handle LIN or RS-485 communication with industrial control modules. Engineers pair this MCU with the MCP23S17 I/O expander for additional GPIOs and the MCP4725 DAC for analog setpoint output. Compared with smaller PIC16 parts, the 4 KB RAM and 96 KB Flash enable on-board menu systems and trending logs without external memory.
Recommended
Automotive LIN Body Controller
The PIC18F66J15T-I/PT's two enhanced USARTs include LIN 1.2/2.0 hardware support, making it suitable for LIN-based automotive body controllers such as door modules, mirror adjusters, and seat controllers. The 96 KB Flash fits LIN application plus bootloader, and 4 KB RAM handles protocol buffers and PWM controls. The 50 I/O pins directly drive window lift motors, mirror position sensors, and LED indicators. Engineers typically pair the MCU with a TJA1027 LIN transceiver and MCP25625 CAN-FD controller for body-domain networks. The industrial -40C to +85C grade covers cabin environments.
Recommended
Capacitive Touch Keypad
The PIC18F66J15T-I/PT's Charge Time Measurement Unit (CTMU) and 10-bit ADC support up to 15 capacitive touch channels with no external touch IC required. With 96 KB Flash, designers can implement advanced gesture recognition, multi-touch decoding, and proximity wake-up algorithms in firmware. The 50 I/O pins drive LED backlighting and matrix scanning without multiplexing. Industrial -40C to +85C temperature range tolerates kitchen, automotive, and outdoor environments. Compared with discrete touch ICs, the integrated solution reduces BOM cost and PCB area while keeping the flexibility of full MCU programmability.
Recommended
USB HID / CDC Bridge
The PIC18F66J15T-I/PT can implement USB Full-Speed HID or CDC device firmware in firmware bit-banging or with the MSSP peripheral, providing a 5V-tolerant USB-to-UART or USB-to-GPIO bridge. The 96 KB Flash comfortably holds USB stacks plus application logic, and 4 KB RAM supports USB ping-pong buffering for sustained throughput. The two USARTs allow simultaneous USB-to-UART and external sensor logging. Engineers pair the MCU with the MCP2200 USB-UART bridge IC for hardware USB enumeration, reducing firmware complexity. Common in lab tools, programming harnesses, and PC peripherals.
Recommended
Embedded Display Driver
The PIC18F66J15T-I/PT's 4 KB RAM and 96 KB Flash fit small TFT or OLED display drivers with frame-buffer support, on-screen menus, and asset animations. The 10-bit ADC reads ambient light for automatic backlight dimming, while 2x ECCP modules generate PWM for LCD contrast or LED brightness control. With 50 I/O pins, designers can simultaneously drive an SPI TFT, a parallel keypad, and rotary encoders without multiplexing. Industrial temperature range suits outdoor kiosks and instrumentation. Compared with bare display controller ICs, the integrated solution allows custom UI logic in firmware without a separate processor.
Recommended
Low-Cost Instrumentation
The PIC18F66J15T-I/PT's combination of 10-bit ADC with up to 15 channels, two USARTs for data logging, and 96 KB Flash for calibration tables suits portable digital multimeters, environmental loggers, and bench-top instruments. The 40 MHz core performs 16-bit fixed-point DSP filtering at real-time rates. The 50 I/O pins drive 7-segment displays, rotary encoders, and range-selection relays. Engineers typically pair the MCU with the MCP3421 18-bit ADC for high-precision measurements and the MCP4725 DAC for stimulus generation. Industrial -40C to +85C supports field deployment.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F66J15T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F66J15-I/PT | PIC18F67J10-I/PT | PIC18F86J15-I/PT | PIC18F66J11T-I/PT | PIC18F66J10-I/PT | PIC18F6680T-I/PT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same |
| Flash Program Memory | 96 KB | 96 KB | 128 KB | 128 KB | 32 KB | 64 KB | 64 KB |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 3.25 KB |
| Max CPU Frequency | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| I/O Pins | 50 | 50 | 50 | 50 | 50 | 50 | 52 |
| 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 | 4.2 V to 5.5 V | 4.2 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Packing Media | Tape & Reel (1200) | Tray | Tray | Tray | Tape & Reel | Tray | Tape & Reel |
Key Differentiators
- Highest Flash density in same-package PIC18J 64-TQFP lineup at lower cost (vs PIC18F86J15-I/PT)
- 50 I/O pins match the 64-TQFP J-family footprint exactly (vs PIC18F66J11T-I/PT)
- Industrial -40C to +85C temperature grade included in standard product (vs PIC18F6680T-I/PT)
Design Notes
The PIC18F66J15T-I/PT operates from a single 4.2V-5.5V rail. Place a 100 nF decoupling capacitor as close as possible to each VDD/AVDD pin pair and a bulk 10 uF tantalum or ceramic capacitor at the supply input. Per Microchip PIC18F87J10 family datasheet section on power, the internal 2.5V core regulator requires a low-ESR capacitor on the core rail pin for stability. Estimated: at 40 MHz full-load CPU operation with all peripherals active, typical IDD is ~25 mA, so the LDO upstream must deliver at least 60 mA for headroom.
Route ICSP signals PGC (RB6) and PGD (RB5) to a dedicated 6-pin header with minimal stub length and series 10 kohm pull-ups on RB6/RB7 to ensure stable in-circuit programming and debugging. Avoid placing high-current switching traces under the ICSP lines to reduce coupling noise. The 64-TQFP package has a non-conductive exposed thermal pad on the underside which should be soldered for mechanical reliability but is not electrically connected.
Do not exceed 5.5V on any VDD pin; the PIC18J family is not 5.5V-tolerant on analog pins when configured for digital I/O unless configured properly. The MSSP I2C pins (RC3/RC4) need external pull-up resistors (typically 4.7 kohm at 400 kHz); the device does not include internal weak pull-ups strong enough for I2C. Configuration bits must be set to enable the internal regulator and the appropriate oscillator mode - omitting this leaves the part in reset. Per Microchip's own alternate-part guidance, use the cross-reference search tool at microchip.com/en-us/cross-reference-search to find pin-compatible alternates when supply tightens.
Compliance Information
RoHS compliant per Microchip product page. Industrial -40C to +85C temperature grade is NOT AEC-Q100 qualified; for under-hood automotive applications requiring -40C to +125C, look for AEC-Q100 qualified "EP" or "F" suffix parts. Lead-free / matte tin finish per Microchip standard surface-mount packaging.
