PIC18F448T-I/L - 8-bit 40MHz 16KB Flash MCU | Microchip 44-PLCC
MPN: PIC18F448T-I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.2 | $9.20 |
| 10 | $8.45 | $84.50 |
| 100 | $7.5 | $750.00 |
| 500 | $6.8 | $3,400.00 |
| 1,000 | $6.1 | $6,100.00 |
PIC18F448T-I/L Overview
A PIC18F microcontroller belongs to Microchip's enhanced mid-range 8-bit RISC family, which combines a 16-bit instruction word with 8-bit data path for code-density and deterministic interrupt response. PIC18F parts sit hierarchically within: 8-bit microcontroller -> MCU -> embedded controller -> semiconductor device. They are designed for legacy industrial, automotive-body and CAN-networked embedded applications where deterministic real-time behaviour, low cost, and a mature toolchain (MPLAB X IDE, XC8 compiler, MPLAB ICD programmers) are preferred over Cortex-M0 devices.
Key features include a 10-bit A/D converter with up to 8 input channels, an integrated CAN 2.0B module with hardware acceptance filters, an enhanced USART supporting RS-232/RS-485, an MSSP peripheral that supports both SPI and I²C (master/slave), four timer modules (Timer0/1/2/3) and dual analog comparators. The device also integrates NanoWatt Technology power management, supporting run, idle and sleep modes with wake-up on interrupt.
Typical applications include industrial CAN-node controllers, HVAC controller boards, sensor-interface modules, automotive body-electronics, and legacy embedded designs where the PIC18 instruction set, peripheral set and tool ecosystem provide shortest development time. The combination of CAN + 10-bit ADC + USART makes it well-suited for distributed sensor networks.
When designing with this device, ensure decoupling follows Microchip's recommended 100 nF ceramic on each VDD/AVDD pair and a bulk 10 µF tantalum or ceramic near the IC. Programming/debug uses the ICSP interface on pins RB6/RB7; reserve those pins in PCB layout.
Drop-in alternatives for PIC18F448T-I/L — 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 PIC18F448T-I/L (same form factor and footprint) — differing in Package, ADC, Core, Mounting Type, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F448-I/L
✅ Drop-In✓ In Stock
$11.5 / Unit
View Datasheet →PIC18F458-I/L
✅ Drop-In✓ In Stock
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View Datasheet →PIC18F448-E/L
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.2 / Unit
View Datasheet →PIC18F4480-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
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View Datasheet →PIC18F4458-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.95 / Unit
View Datasheet →PIC18F448T-I/L Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit RISC |
| Maximum Clock Speed | 40 MHz |
| Program Memory | 16 KB (8K × 16) Flash |
| RAM | 768 bytes |
| EEPROM | 256 bytes |
| I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| CAN | CAN 2.0B, hardware acceptance filters |
| UART | 1 × Enhanced USART |
| SPI / I²C | 1 × MSSP (SPI or I²C) |
| Timers | Timer0, Timer1, Timer2, Timer3 |
| Comparators | 2 × Analog Comparators |
| Package | 44-pin PLCC (16.59 × 16.59 mm) |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| Programming | ICSP (In-Circuit Serial Programming) |
PIC18F448T-I/L Pin Configuration
| Pin 1 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Pin 2 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Pin 3 | RB2/CANRX — Digital I/O / CAN receive |
| Pin 4 | RB3/CANTX — Digital I/O / CAN transmit |
| Pin 5 | RB4 — Digital I/O |
| Pin 6 | RB5 — Digital I/O |
| Pin 7 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 8 | RB7/PGD — Digital I/O / ICSP data |
| Pin 9 | RC0 — Digital I/O |
| Pin 10 | RC1 — Digital I/O |
| Pin 11 | RC2 — Digital I/O |
| Pin 12 | RC3 — Digital I/O |
| Pin 13 | OSC1 — Crystal/oscillator input |
| Pin 14 | OSC2 — Crystal/oscillator output |
| Pin 15 | RC4 — Digital I/O |
| Pin 16 | RC5 — Digital I/O |
| Pin 17 | RC6/TX — Digital I/O / USART TX |
| Pin 18 | RC7/RX — Digital I/O / USART RX |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Positive supply |
| Pin 21 | RD0 — Digital I/O |
| Pin 22 | RD1 — Digital I/O |
| Pin 23 | RD2 — Digital I/O |
| Pin 24 | RD3 — Digital I/O |
| Pin 25 | RD4 — Digital I/O |
| Pin 26 | RD5 — Digital I/O |
| Pin 27 | RD6 — Digital I/O |
| Pin 28 | RD7 — Digital I/O |
| Pin 29 | RE0/RD — Digital I/O / Parallel slave port read |
| Pin 30 | RE1/WR — Digital I/O / Parallel slave port write |
| Pin 31 | RE2/CS — Digital I/O / Parallel slave port CS |
| Pin 32 | VSS — Ground |
| Pin 33 | VDD — Positive supply |
| Pin 34 | AVDD — Analog positive supply |
| Pin 35 | AVSS — Analog ground |
| Pin 36 | RA0/AN0 — Digital I/O / Analog input 0 |
| Pin 37 | RA1/AN1 — Digital I/O / Analog input 1 |
| Pin 38 | RA2/AN2 — Digital I/O / Analog input 2 |
| Pin 39 | RA3/AN3 — Digital I/O / Analog input 3 / VREF+ |
| Pin 40 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 41 | RA5/AN4 — Digital I/O / Analog input 4 |
| Pin 42 | MCLR — Master clear reset (active low) |
| Pin 43 | RA6 — Digital I/O / oscillator |
| Pin 44 | RA7 — Digital I/O / oscillator |
Typical Applications
PIC18F448T-I/L is suitable for 6 applications: Industrial CAN-Bus Sensor Nodes, HVAC Controller Boards, Automotive Body Electronics, Sensor Interface Modules, Legacy Embedded Control Upgrades, Distributed Building Automation.
Industrial CAN-Bus Sensor Nodes
The PIC18F448T-I/L fits industrial CAN-bus sensor nodes because its integrated CAN 2.0B controller with hardware acceptance filters offloads frame filtering from the CPU, leaving the 40 MHz PIC18 core free to handle sensor acquisition and local diagnostics. With 16 KB Flash you can implement CiA DS401 generic I/O profiles or simple custom protocols; the 768-byte SRAM supports ~50 small CAN messages in transit. The 10-bit ADC with up to 8 channels reads multiple sensors (temperature, pressure, humidity) while the 34 I/O lines drive relays or status LEDs. Placed on an industrial backplane next to a CAN transceiver like the MCP2551 or TJA1050, the part operates from -40 °C to +85 °C in factory-floor environments. Compared with software-CAN bit-banging, the hardware CAN engine delivers deterministic worst-case response times required by industrial control.
Recommended
HVAC Controller Boards
In HVAC controller boards, the PIC18F448T-I/L serves as the supervisory MCU reading analog temperature sensors via its 10-bit ADC, controlling fan triacs through PWM, and exchanging data over RS-485 via the enhanced USART. The integrated MSSP can drive I²C temperature/humidity sensors (e.g., MCP9808) or SPI LCD displays without extra glue logic. The 44-pin PLCC through-hole package is preferred over QFN for HVAC controls because it survives hand-repair and harsh thermal cycling in equipment closets. The NanoWatt Technology sleep/idle modes reduce standby power when the compressor is off, which matters for energy-rating compliance. The part's 16 KB Flash comfortably fits typical HVAC state-machine firmware plus diagnostic logs.
Recommended
Automotive Body Electronics
The PIC18F448T-I/L (industrial grade) is suitable for non-safety automotive body-electronics modules such as door-lock controllers, seat-position memory, ambient lighting, and HVAC actuators in cabin modules. Its integrated CAN 2.0B connects to the vehicle CAN-C body bus, the 10-bit ADC reads switch positions, and the PWM channels drive small DC motors. While the industrial -40 °C to +85 °C grade is adequate for cabin locations, under-hood or near-engine modules require the PIC18F448-E/L extended-temperature variant. Compared with 32-bit Cortex-M0 parts, the PIC18F448 offers lower cost, deterministic interrupt latency, and decades of stable firmware infrastructure across automotive Tier-1 supply chains.
Recommended
Sensor Interface Modules
The PIC18F448T-I/L serves as the local controller in distributed sensor-interface modules that digitize analog inputs and forward readings over CAN, RS-485, or RS-232. The 10-bit ADC provides adequate resolution for many industrial sensors, and the MSSP can interface with external 16-bit ADCs (e.g., MCP3421) for higher precision when needed. The 34 I/O lines accommodate opto-isolated digital inputs and relay outputs typical in process-control modules. The 768-byte SRAM buffers message queues before transmission, while the 16 KB Flash stores calibration tables and protocol stacks. The PLCC package simplifies field-serviceability — a tech can swap modules without hot-air rework.
Recommended
Legacy Embedded Control Upgrades
Designers maintaining legacy PIC16 or PIC18 systems use the PIC18F448T-I/L as a drop-in upgrade to gain CAN support, a 10-bit ADC, and 16 KB Flash while preserving the PIC18 instruction set, MPLAB X IDE workflow, and XC8 toolchain. The 44-pin PLCC package matches footprint-to-footprint the legacy PIC18C442/PIC18F442 designs, simplifying PCB-rework upgrades. The part's enhanced mid-range architecture offers 16-bit instructions for code density while keeping an 8-bit data path, easing migration from older PIC18F designs. Industrial customers appreciate that firmware IP, configuration bits, and ICSP programming procedures remain identical to the PIC18F442, requiring only firmware recompilation.
Recommended
Distributed Building Automation
In distributed building-automation networks (BACnet, KNX, or proprietary RS-485 protocols), the PIC18F448T-I/L acts as a node controller managing lighting zones, blinds, and occupancy sensors. The CAN 2.0B interface can be reconfigured for RS-485 via an external transceiver plus software UART, or the enhanced USART handles RS-485 directly with an SN65HVD75 transceiver. The NanoWatt Technology sleep mode drops standby consumption below 1 µA, critical for battery-powered wireless sensor nodes. The 34 I/O lines accommodate multiple relay outputs and digital inputs, while the 10-bit ADC reads analog light sensors. The 44-pin PLCC package is rugged for ceiling-fixture mounting where vibration and temperature swings occur.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F448T-I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F448-I/L | PIC18F458-I/L | PIC18F448-E/L | PIC18F4480-I/PT | PIC18F4458-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin PLCC | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin TQFP - same pin count, different footprint | 44-pin QFN - same pin count, different footprint |
| Flash Memory | 16 KB | 16 KB | 32 KB (+100%) | 16 KB | 16 KB | 24 KB |
| Maximum Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 48 MHz |
| RAM | 768 bytes | 768 bytes | 1536 bytes (+100%) | 768 bytes | 768 bytes | 2048 bytes |
| CAN Controller | Yes (CAN 2.0B) | Yes | Yes | Yes | Yes (enhanced) | Yes |
| USB | No | No | No | No | No | Yes (USB 2.0 FS) |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C |
Key Differentiators
- Integrated hardware CAN 2.0B controller (vs PIC18F442-I/P (predecessor, no CAN))
- 16 KB Flash vs 32 KB on PIC18F458 (vs PIC18F458-I/L)
- 44-pin PLCC through-hole package (vs PIC18F448-I/PT (TQFP SMD))
Design Notes
Estimated: PIC18F448T-I/L power dissipation is dominated by oscillator, I/O drive current and ADC reference. At 40 MHz with all peripherals active and typical I/O load, VDD current is roughly 15-20 mA, so a 100 mA regulator headroom is sufficient. Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD/AVDD pair (pins 11/32 for VDD, pin 30 for AVDD) and a 10 µF bulk tantalum or ceramic near the IC. NanoWatt Technology sleep modes drop current to < 1 µA — use them for battery-backed nodes and wake on INT0/INT1 interrupts.
Reserve pins RB6 (PGC) and RB7 (PGD) for ICSP in-circuit serial programming — adding external pull-ups or LEDs to these pins can prevent debugger connection. Never tie MCLR (pin 17 in TQFP / pin 9 in DIP, here pin 42 in PLCC) directly to VDD; always use a 10 kΩ pull-up to VDD with a 100 nF cap to ground for proper reset. Brown-out detection should be enabled in configuration bits to avoid Flash corruption during VDD dips. Configuration bits must be set correctly (HS oscillator for > 4 MHz crystal, WDT off in production, etc.) — programming a device with wrong config bits can brick it.
For the 44-pin PLCC package, allocate a 1.27 mm (50 mil) pitch PLCC land pattern with thermal relief spokes. Place the 4 MHz to 40 MHz crystal within 5 mm of the OSC1/OSC2 pins and surround it with a ground guard ring to reduce EMI. Route the analog AVSS/AVDD traces away from digital switching signals; consider a separate analog ground island. Keep CAN traces (RB2/CANRX, RB3/CANTX) short and matched to within 5 mm before connecting to the MCP2551 or TJA1050 transceiver. Add a 120 Ω termination resistor at each end of the CAN bus, not at every node.
Estimated: For the 44-pin PLCC land pattern, ensure via-in-pad or tented vias are NOT used under PLCC pads — use dog-bone fanout instead to maintain solder joint reliability through thermal cycles. Place bypass capacitors on the same side as the IC, not on the opposite PCB layer, to minimize loop inductance. Use a continuous ground plane on layer 2, splitting only under the analog AVSS/AVDD area. For CAN-bus applications, place the CAN transceiver within 25 mm of the PIC18F448's RB2/RB3 pins to keep stubs short. Reserve a 4-pin header (VPP/MCLR, PGD, PGC, GND) on every PCB for production ICSP programming access.
Compliance Information
RoHS compliance and REACH status not stated explicitly in verified web data; refer to Microchip's product environmental compliance page or datasheet declaration. Industrial temperature grade only - not AEC-Q100 qualified; choose PIC18F448-E/L or automotive-grade variants for harsh environments.
