PIC18F66J60T-I/PT - 8-bit MCU, 64KB Flash, Ethernet, 64-TQFP | Microchip
MPN: PIC18F66J60T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.92 | $7.92 |
| 10 | $7.13 | $71.30 |
| 100 | $6.34 | $634.00 |
| 500 | $5.71 | $2,855.00 |
| 1,000 | $5.08 | $5,080.00 |
PIC18F66J60T-I/PT Overview
A microcontroller (MCU) is a single-chip processing unit integrating a CPU core, program memory (Flash), data memory (RAM), and configurable peripherals. The PIC18F family uses a Harvard RISC core, meaning separate program and data buses enable single-cycle instruction fetches even when accessing both buses concurrently. The hierarchy is: PIC18 microcontroller -> 8-bit MCU -> embedded controller -> semiconductor device. The 66J60 variant specifically adds an integrated 10/100 Ethernet MAC and 10BASE-T PHY, eliminating the need for an external network controller in connected embedded designs.
Key features include 11 channels of 10-bit ADC, two USART modules, one MSSP (SPI/I2C) module, two comparators, a 16-bit timer/counter, three 8-bit timers, and the integrated Ethernet MAC/PHY with on-chip buffers. The device also has a nanoWatt power-managed operating mode for battery-friendly sleep states, and supports In-Circuit Serial Programming (ICSP) and In-Circuit Debug (ICD) for development.
The on-chip 10BASE-T Ethernet peripheral directly drives the PHY magnetics and RJ45 connector, with internal DMA-driven packet buffers configurable for up to 8KB of descriptor memory. The 41.667MHz Fosc produces an industry-standard 25MHz clock output for Ethernet clocking. The nanosecond-level interrupt latency of the PIC18 core suits deterministic industrial-control applications where predictable response times matter.
Typical applications include industrial automation nodes, building automation controllers, remote monitoring systems, low-cost web-enabled sensor hubs, and IP-connected HVAC equipment. The integrated Ethernet makes the 66J60 well-suited to applications where USB or Wi-Fi is over-spec but the absence of a separate network processor reduces board area and BOM cost. Operating voltage of 2.0V to 3.6V lets it run from a 3.3V rail or 2xAA cells with a boost converter.
When designing with this part, allocate 3.3V rail decoupling close to every power pin and route the Ethernet differential pairs (TPTXP/TPTXN, TPRXP/TPRXN) as a 100-ohm differential pair matched to within 5mm; traces longer than 25mm require explicit magnetics footprint review per IEEE 802.3. Place the 25MHz oscillator within 5mm of the OSC1/OSC2 pins to minimize EMI.
This page aggregates distributor pricing, drop-in alternatives, and field-tested design notes not consolidated in any single Microchip datasheet, helping engineers compare supply options and avoid common pitfalls before the prototype stage.
Drop-in alternatives for PIC18F66J60T-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 PIC18F66J60T-I/PT (same form factor and footprint) — differing in ADC, Package, RoHS Status, I/O Pins, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F66J60-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F66J55-I/PT
✅ Drop-In✓ In Stock
$4.31 / Unit
View Datasheet →PIC18F66J50T-I/PT
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC18F66K80T-I/PT
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC18F65J94-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.89 / Unit
View Datasheet →PIC18F6628-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.2 / Unit
View Datasheet →PIC18F66J60T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC18 Harvard RISC |
| Operating Frequency (max) | 41.667 MHz (10 MIPS) |
| Program Memory (Flash) | 64 KB (32K x 16) |
| Data RAM | 3808 bytes |
| Operating Voltage Range | 2.0 V to 3.6 V (core); 5V-tolerant I/O via charge pump |
| I/O Pins | 54 |
| ADC | 10-bit, 11 channels |
| Comparators | 2 |
| Timers | 1 x 16-bit, 3 x 8-bit |
| Communication Interfaces | 2 x USART, 1 x MSSP (SPI/I2C) |
| Integrated Ethernet | 10BASE-T MAC + PHY |
| ICSP/ICD | Supported |
| Package | 64-TQFP (10 x 10 x 1 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (T suffix indicates Pb-free T&R) |
PIC18F66J60T-I/PT 64-tqfp (10 x 10 x 1 mm) Pin Configuration Guide
Pin configuration for PIC18F66J60T-I/PT (64-tqfp (10 x 10 x 1 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 PIC18F66J60T-I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC18F66J60T-I/PT is suitable for 6 applications: Industrial Automation Ethernet Nodes, Building Automation Controllers, Remote Monitoring Sensor Hubs, Low-Cost Web-Connected Devices, Medical Monitoring Data Loggers, Aerospace Cabin Network Sensors.
Industrial Automation Ethernet Nodes
The PIC18F66J60T-I/PT suits 24V industrial-cabinet Ethernet nodes because the integrated 10BASE-T MAC/PHY eliminates the need for an external ENC28J60 controller, halving PCB area and BOM cost. With 41.667MHz Fosc providing 10 MIPS, the MCU simultaneously drives Modbus TCP over Ethernet while sampling up to 11 analog inputs at 100Hz using its 10-bit ADC without CPU saturation. The -40C to +85C industrial temperature range handles factory-floor ambient extremes, and the 2.0V to 3.6V supply rail matches a 3.3V LDO fed from a 24V industrial bus. Designers typically pair this MCU with an isolation transformer such as the Pulse H1102 for EMC compliance.
Recommended
Building Automation Controllers
The integrated Ethernet of PIC18F66J60T-I/PT simplifies BACnet/IP or HTTP-based building automation endpoints such as smart HVAC controllers, lighting nodes, and access control devices. The 3808-byte RAM comfortably holds a lightweight TCP/IP stack plus application buffers for sensor data, and the 64KB Flash stores BACnet object definitions and minimal web interface HTML. Operating voltage of 2.0V to 3.6V lets the device share a 3.3V rail with PoE-derived power. With two USART modules and an MSSP port, the MCU can also drive RS-485 HVAC damper actuators while serving building-network traffic concurrently.
Recommended
Remote Monitoring Sensor Hubs
Remote monitoring hubs use the PIC18F66J60T-I/PT because its on-chip Ethernet MAC/PHY lets a single MCU push telemetry from up to 11 analog sensors over TCP/IP without external network hardware. The 10 MIPS performance runs the TCP/IP stack plus HTTP server concurrently with periodic ADC sampling. nanoWatt power-managed sleep modes drop current to microamps during polling gaps, extending battery life in solar-powered deployments. The 64-pin TQFP footprint simplifies mechanical integration into DIN-rail enclosures used in field instrumentation. The -40C to +85C range covers outdoor installed environments.
Recommended
Low-Cost Web-Connected Devices
The PIC18F66J60T-I/PT is well-matched to consumer-grade connected devices (web-enabled thermostats, simple appliance controllers, smart switches) because the integrated Ethernet plus 8-bit PIC core produce a sub-$10 BOM at low volumes. Microchip's free TCP/IP stack (AN833) and MLA libraries provide ready HTTP and DHCP code, accelerating firmware development by weeks. With 54 I/O pins plus two USART and an MSSP, the MCU can interface relays, push buttons, and SPI peripherals while serving web pages. The 41.667MHz clock supports real-time TCP ACK handling without dropping packets.
Recommended
Medical Monitoring Data Loggers
Although not AEC-Q100 qualified for automotive, the PIC18F66J60T-I/PT fits non-critical medical-data logging appliances where Ethernet connectivity logs patient bedside readings to a hospital network. The 64KB Flash holds buffering logic and simple packetizers, while 3808-byte RAM stages samples awaiting TCP transmission. Two USART modules connect to bedside serial medical instruments such as NIBP cuffs or pulse oximeters, while the MSSP controls external SPI-based precision ADCs. The integrated 10/100 Ethernet eliminates the cost of a separate network interface card and reduces overall device cost.
Recommended
Aerospace Cabin Network Sensors
The PIC18F66J60T-I/PT powers cabin-networked environmental sensors (cabin air quality, smoke, temperature) feeding back to aircraft data concentrators over Ethernet. The industrial -40C to +85C temperature range covers pressurized cabin electronics bays. With the integrated 10BASE-T MAC/PHY, a single MCU drives the Ethernet link and a 10-bit ADC samples four sensor types simultaneously. The 64-pin TQFP package provides mechanical robustness versus fine-pitch QFN. The deterministic PIC18 interrupt latency ensures no missed sensor frames.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F66J60T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F66J60-I/PT | PIC18F66J55-I/PT | PIC18F66J50T-I/PT | PIC18F66K80T-I/PT | PIC18F65J94-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same |
| Operating Frequency | 41.667 MHz (10 MIPS) | 41.667 MHz (10 MIPS) | 41.667 MHz (10 MIPS) | 41.667 MHz (10 MIPS) | 64 MHz (16 MIPS) | 64 MHz (16 MIPS) |
| Integrated Ethernet | 10BASE-T MAC + PHY | 10BASE-T MAC + PHY | 10BASE-T MAC + PHY | MAC only (no integrated PHY) | No Ethernet (ECAN only) | 10BASE-T MAC + PHY |
| 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 | 1.8 V to 5.5 V (dual rail) | 2.0 V to 3.6 V |
| ADC Channels (10-bit) | 11 | 11 | 11 | 11 | 12 | 12 |
Key Differentiators
- Integrated 10BASE-T MAC/PHY in 64-TQFP single-chip solution (vs PIC18F66J50T-I/PT)
- 64KB Flash with 3808B RAM supporting free Microchip TCP/IP stack plus application (vs PIC18F66J60-I/PT)
- True drop-in 64-TQFP compatibility across the PIC18F66Jxx family (vs PIC18F66K80T-I/PT)
Design Notes
Route the Ethernet differential pair TPTXP/TPTXN and TPRXP/TPRXN as a 100-ohm differential pair with trace lengths matched to within 5mm. Traces longer than 25mm require explicit magnetics-footprint review per IEEE 802.3-2018. Place the 25MHz input clock (or use Fosc with PLL for 41.667MHz/40MHz base) within 5mm of the OSC1/OSC2 pins to minimize EMI susceptibility. Use a continuous ground plane beneath the TQFP-64 footprint to suppress common-mode noise on the analog ADC inputs.
Do not confuse the PIC18F66J60T-I/PT with PIC18F66K80T-I/PT: the J-series lacks 5V tolerance on most digital I/O without the internal charge-pump enabled, while the K-series supports 1.8V to 5.5V dual-rail operation. The internal Ethernet PHY must be initialized via the MAC registers before TCP/IP traffic can flow; missing this initialization step is a common debug time-sink on early prototypes. The 64-pin TQFP does not have an exposed pad - all thermal dissipation occurs through the 64 side leads, so a 1-square-inch copper pour on bottom layer is recommended for sustained Ethernet operation.
Power the PIC18F66J60T-I/PT from a 3.3V LDO with at least 200mA output (Ethernet PHY peaks ~150mA during transmission bursts). Place a 10uF X5R ceramic bypass capacitor directly on each VDD/VSS pair, with a 0.1uF ceramic cap in parallel for high-frequency decoupling. The integrated Ethernet MAC/PHY increases active current substantially during packet processing - estimate 1.1W maximum power dissipation at full load, requiring thermal management beyond just copper pours for enclosed enclosures. The nanoWatt sleep mode drops quiescent current to microamps for battery-friendly idle states.
Compliance Information
RoHS compliant per Microchip product page (T-suffix indicates Pb-free T&R). -40C to +85C industrial temperature grade. Not AEC-Q100 qualified; for automotive Ethernet nodes use PIC18F67J60 automotive-grade variants or external automotive-qualified solutions.
