PIC18F66J11T-I/PT - 64KB Flash 8-bit MCU TQFP-64 | Microchip
MPN: PIC18F66J11T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.48 | $64.80 |
| 100 | $5.76 | $576.00 |
| 500 | $5.18 | $2,590.00 |
| 1,000 | $4.61 | $4,610.00 |
PIC18F66J11T-I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), data memory (RAM), and configurable peripherals (timers, ADC, communication interfaces). The PIC18 architecture is an enhanced Harvard 8-bit RISC core, sitting in the taxonomy: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. The PIC18F66J11 family specifically targets low-voltage (2.0-3.6V) designs while still allowing 5V-tolerant inputs for mixed-voltage systems.
Key features of the PIC18F66J11T-I/PT include nanoWatt Technology for power management, an internal 8 MHz oscillator, a Parallel Master Port (PMP) for external memory or graphics interfacing, Enhanced ICD with 3 hardware breakpoints for in-circuit debugging, and Flash endurance of 10,000 erase/write cycles with 20-year data retention. The 51 I/O lines support peripheral pin select flexibility, and the device operates across the industrial temperature range (-40C to +85C).
The PIC18F66J11 architecture uses a 16-bit instruction word with a multi-stage pipeline, achieving 10 MIPS at 48 MHz while consuming very low active current thanks to nanoWatt Technology. The PMP module can interface to external parallel buses, SRAM, or TFT displays, and the four serial ports enable simultaneous bridges to sensor, host, debug, and fieldbus domains.
Typical applications include industrial control panels, USB-to-UART bridges, multi-protocol sensor hubs, low-power HMI terminals, and 3V appliance controllers. The wide peripheral set makes the device well-suited for cost-sensitive products that still need multiple communication channels.
When designing with the PIC18F66J11T-I/PT, ensure the supply is decoupled with a 100 nF ceramic capacitor close to VDD and a bulk tantalum or aluminum polymer cap of at least 10 uF; the analog and digital VDD pins must be tied together even when the ADC is unused. Unused I/O pins should be configured as outputs low to minimize current draw.
This page synthesizes distributor pricing, drop-in same-package alternatives from the PIC18F87J11 family, and practical design notes not found in the manufacturer datasheet, helping engineers select the right 8-bit MCU for cost-sensitive 3V designs.
Drop-in alternatives for PIC18F66J11T-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 PIC18F66J11T-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:
PIC18F66J11-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F65J11-I/PT
✅ Drop-In✓ In Stock
$4.35 / Unit
View Datasheet →PIC18F67J11-I/PT
✅ Drop-In✓ In Stock
$5.4 / Unit
View Datasheet →PIC18F66J50-I/PT
✅ Drop-In✓ In Stock
$5.05 / Unit
View Datasheet →PIC18F6628-I/PT
✅ Drop-In✓ In Stock
$5.2 / Unit
View Datasheet →PIC18F65K90-I/MR
✅ Drop-In✓ In Stock
$3.02 / Unit
View Datasheet →PIC18F66J11T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit RISC, enhanced Harvard) |
| Program Memory (Flash) | 64 KB (32K x 16) |
| Data Memory (RAM) | 3,936 bytes |
| Maximum CPU Speed | 48 MHz (10 MIPS) |
| Supply Voltage Range | 2.0 V to 3.6 V |
| Digital Input Voltage Tolerance | 5 V tolerant |
| I/O Pins | 51 |
| Package | TQFP-64 (10x10 mm) |
| Operating Temperature | -40C to +85C (Industrial, -I) |
| Internal Oscillator | 8 MHz (software selectable) |
| Flash Endurance | 10,000 erase/write cycles |
| Data Retention | 20 years |
| Serial Communication Ports | 2x I2C/SPI, 2x UART (4 total) |
| Parallel Master Port (PMP) | Yes |
| In-Circuit Debug | Enhanced ICD, 3 HW breakpoints |
| Power Technology | nanoWatt Technology |
| Mounting Type | Surface Mount (Tape & Reel) |
PIC18F66J11T-I/PT tqfp-64 (10x10 mm) Pin Configuration Guide
Pin configuration for PIC18F66J11T-I/PT (tqfp-64 (10x10 mm) 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 PIC18F66J11T-I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC18F66J11T-I/PT is suitable for 6 applications: Industrial Control Panel, Multi-Protocol Sensor Hub, USB-UART Bridge Device, Low-Power HMI Terminal, 3V Appliance Controller, Data Logging Instrument.
Industrial Control Panel
The PIC18F66J11T-I/PT is well-suited to industrial control panels where 64 KB of Flash accommodates a full-featured HMI stack plus communication protocols, while the 2.0-3.6V supply simplifies battery-backed designs. The Parallel Master Port drives character LCDs or graphical TFTs, and the four serial ports connect to sensor hubs, RS-485 transceivers, and fieldbus gateways concurrently. The 5V-tolerant inputs accept legacy 5V encoder or limit-switch signals, eliminating the need for level shifters in mixed-voltage panels.
Recommended
Multi-Protocol Sensor Hub
The PIC18F66J11T-I/PT's four serial ports (2x I2C/SPI + 2x UART) make it ideal as a sensor hub that aggregates data from multiple sensor types including SPI accelerometers, I2C environmental sensors, and UART GPS modules. At 48 MHz / 10 MIPS, the core can service multiple 100 kHz I2C and 1 MHz SPI buses without missing data, while 3,936 bytes of RAM buffers incoming frames. NanoWatt Technology reduces quiescent current to microamp levels for battery-backed sensor nodes.
Recommended
USB-UART Bridge Device
While the base PIC18F66J11T-I/PT does not include USB, dropping in the drop-in PIC18F66J50-I/PT variant enables a USB 2.0 full-speed OTG bridge. The 64 KB Flash holds CDC and HID class drivers, and the UART ports drive RS-232/RS-485 external transceivers. At 3.3V supply, the device can be powered directly from the USB rail without additional regulators, saving BOM cost.
Recommended
Low-Power HMI Terminal
The PIC18F66J11T-I/PT drives low-power HMI terminals using its Parallel Master Port to interface with character LCDs or small TFT panels, while the four serial ports connect to RFID readers, keypads, and upstream controllers. NanoWatt Technology and the internal 8 MHz oscillator allow sleep currents below 1 uA, extending battery runtime for handheld terminals. The 64 KB Flash holds a full graphics library plus localized UI strings.
Recommended
3V Appliance Controller
The PIC18F66J11T-I/PT powers 3V appliance controllers such as coffee machines, washing machine front panels, and small kitchen appliances where cost and BOM consolidation matter. The 5V-tolerant inputs accept existing 5V sensor signals, the 64 KB Flash holds the full user-interface plus fault-handling code, and nanoWatt Technology reduces standby power below Energy Star thresholds. Four serial ports support multiple appliance sub-systems concurrently.
Recommended
Data Logging Instrument
The PIC18F66J11T-I/PT acts as a multi-channel data logger with its 11 ADC channels sampling sensors and its 4 serial ports streaming data to external EEPROM, SD cards via SPI, or a host via UART. At 48 MHz, the core can sample, process, and write logs at >10 kHz aggregate rates, while 3,936 bytes of RAM buffers between writes. The 2.0-3.6V supply suits battery-powered remote instruments where Energy Star compliance matters.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F66J11T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F66J11-I/PT | PIC18F65J11-I/PT | PIC18F67J11-I/PT | PIC18F66J50-I/PT | PIC18F6628-I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-64 (10x10 mm) | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 64 KB | 64 KB | 16 KB | 128 KB | 64 KB | 64 KB |
| RAM | 3,936 bytes | 3,936 bytes | 2,048 bytes | 3,936 bytes | 3,936 bytes | 4,096 bytes |
| Maximum Clock Speed | 48 MHz (10 MIPS) | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 40 MHz |
| Supply Voltage Range | 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 | 2.0 V to 3.6 V | 2.0 V to 5.5 V |
| I/O Pins | 51 | 51 | 51 | 51 | 51 | 51 |
| Integrated USB | No | No | No | No | Yes (USB 2.0 OTG) | No |
| Automotive Grade | No (Industrial) | No | No | No | No | No |
Key Differentiators
- Lowest-cost 64KB Flash PIC18 in TQFP-64 with 5V-tolerant inputs (vs PIC18F6628-I/PT)
- Drop-in scalability to 128 KB Flash without PCB change (vs PIC18F65J11-I/PT)
- USB 2.0 OTG upgrade available in same footprint (vs PIC18F66J50-I/PT)
Design Notes
Decouple the PIC18F66J11T-I/PT supply with a 100 nF ceramic capacitor as close as possible to each VDD pin, plus a single bulk 10 uF X5R ceramic or tantalum capacitor near the chip. The AVDD pin must be tied to the same supply as VDD through a ferrite bead or low-pass filter even if the ADC is unused, per Microchip's reference designs. nanoWatt Technology provides sleep currents below 1 uA when peripherals are gated, enabling long battery life in remote nodes.
Use a 4-layer PCB with a dedicated ground plane beneath the TQFP-64 device to provide a low-impedance return path for high-frequency signals. Place the crystal or external clock traces within 5 mm of the OSC1/OSC2 pins and guard them with a ground ring. Keep analog inputs (AN0-ANx) short and routed away from digital I/O lines to avoid crosstalk into ADC readings, especially when sampling at high rates.
Configure unused I/O pins as outputs driving low (never leave them floating) to eliminate shoot-through current on the input structures of the PIC18F66J11T-I/PT. When migrating code from older PIC18F 'K' or 'F' series parts, verify that your configuration bits set the correct oscillator mode (HS vs. INTOSC) and disable the watchdog if not used. The PMP module pins must be explicitly released from PPS before reassigning them to digital I/O functions.
Compliance Information
RoHS compliant per Microchip product page. Lead-free TQFP-64 package. Standard -I industrial temperature grade (-40C to +85C); not AEC-Q100 qualified for automotive applications.
