PIC18F4450-I/P - 8-bit 48MHz 16KB Flash USB MCU | Microchip
MPN: PIC18F4450-I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.45 | $9.45 |
| 10 | $8.62 | $86.20 |
| 100 | $7.55 | $755.00 |
| 500 | $6.78 | $3,390.00 |
| 1,000 | $6.05 | $6,050.00 |
PIC18F4450-I/P Overview
What is a PIC18F microcontroller? PIC18F is Microchip's enhanced 8-bit PIC microcontroller family, positioned between the baseline PIC16 and the 16-bit dsPIC families in Microchip's portfolio. These parts share a RISC Harvard architecture, a unified instruction set, and a powerful peripheral set, making them ideal for embedded control applications that require deterministic interrupt response, low power, and easy migration between pin counts. The 4450 sub-family specifically adds an on-chip USB 2.0 Full-Speed transceiver and is targeted at applications such as human-interface devices, USB-to-UART bridges, and embedded hosts that previously required an external USB controller.
Key features include 16 KB (8K x 16) Flash program memory, 768 bytes of RAM, 256 bytes of EEPROM, 34 digital I/O pins, 13 10-bit ADC channels, two 8-bit timers and three 16-bit timers, a Capture/Compare/PWM module, hardware USB 2.0 Full-Speed with internal pull-up resistor, and nanoWatt power-saving modes with idle and sleep states drawing only microamps. The 40-pin PDIP (0.600 inch) package allows hand-soldering, breadboarding, and socketed prototypes.
The architecture uses an 8-bit data path with a 16-bit instruction word and a hardware multiplier for single-cycle 8x8 multiplication. The integrated USB SIE handles bus enumeration, bulk/interrupt/isochronous endpoints, and suspend/resume signaling, eliminating external transceivers. On-chip peripherals are prioritized via a vectored interrupt controller with two priority levels, allowing deterministic real-time response for USB traffic and motor-control PWM.
Typical applications include USB human-interface devices (HID mice, keyboards, custom peripherals), USB-to-serial converter dongles, low-cost data loggers, sensor read-out boards, industrial control panels, and educational/training boards where the through-hole package simplifies lab work.
When designing with the PIC18F4450, supply decoupling of at least 100 nF near each power pin and a 10 uF bulk capacitor on VDD is essential, and the USB D+/D- traces must be 90 ohm differential and length-matched. The internal 48 MHz PLL is enabled by configuration fuses and requires the HS or HSPLL oscillator mode for USB operation; an external 4, 8, 12, 16, 20, 24, or 48 MHz crystal with appropriate load capacitors must be selected per the oscillator configuration fuse settings.
This page synthesizes distributor pricing, drop-in same-package alternatives, comparison parameters, and practical design notes not collated on a single distributor product page.
Drop-in alternatives for PIC18F4450-I/P — 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 PIC18F4450-I/P (same form factor and footprint) — differing in Package, Timers, ADC, Operating Temperature, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F4550-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4458-I/P
✅ Drop-In✓ In Stock
$4.62 / Unit
View Datasheet →PIC18F4455-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF4450-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F45K50-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4450-I/P Maximum Ratings & Electrical Characteristics
| Core | PIC18F (8-bit RISC) |
| Program Memory | 16 KB (8K x 16) Flash |
| RAM | 768 bytes |
| EEPROM | 256 bytes |
| Max CPU Clock | 48 MHz |
| Instruction Throughput | 16 MIPS |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| I/O Pins | 34 (port A/B/C/D/E subset) |
| ADC | 10-bit, up to 13 channels |
| USB | USB 2.0 Full-Speed (12 Mbit/s), internal transceiver |
| Timers | 2 x 8-bit, 3 x 16-bit |
| CCP/ECCP Modules | 2 (Capture/Compare/PWM) |
| Serial Interfaces | EUSART, MSSP (SPI / I2C) |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 40-pin PDIP (DIP-40, 0.600 inch) |
| Mounting Type | Through-Hole |
| MSL Level | 1 (Not Moisture Sensitive) |
| RoHS Status | Compliant |
| Lead-Free | Yes (matte tin) |
| Power-Saving Modes | nanoWatt (Idle, Sleep, etc.) |
PIC18F4450-I/P Pin Configuration
| Pin 1 | VPP/RE3 — Programming voltage / RE3 general-purpose I/O |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC negative reference |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC positive reference |
| Pin 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / TMR0 clock / comparator 1 output |
| Pin 7 | RA5/AN4/SS/C2OUT — PORTA bit 5 / analog input 4 / SPI slave select / comparator 2 output |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI — Crystal input / external clock input |
| Pin 10 | OSC2/CLKO — Crystal output / clock output |
| Pin 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / TMR1 oscillator output / TMR1 clock |
| Pin 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / TMR1 oscillator input / CCP2 |
| Pin 13 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| Pin 14 | VUSB — Internal USB 3.3V regulator output (connect 220 nF to VSS) |
| Pin 15 | RC4/D-/VMO — PORTC bit 4 / USB D- / ICD voltage monitor output |
| Pin 16 | RC5/D+/VPO — PORTC bit 5 / USB D+ / ICD voltage monitor output |
| Pin 17 | RC6/TX/CK — PORTC bit 6 / EUSART TX / EUSART clock |
| Pin 18 | RC7/RX/DT — PORTC bit 7 / EUSART RX / EUSART data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply 4.2-5.5 V |
| Pin 21 | RB0/AN12/INT0 — PORTB bit 0 / analog input 12 / external interrupt 0 |
| Pin 22 | RB1/AN10/INT1 — PORTB bit 1 / analog input 10 / external interrupt 1 |
| Pin 23 | RB2/AN8/INT2 — PORTB bit 2 / analog input 8 / external interrupt 2 |
| Pin 24 | RB3/AN9/CCP2 — PORTB bit 3 / analog input 9 / CCP2 alternate |
| Pin 25 | RB4/AN11/KBI0 — PORTB bit 4 / analog input 11 / KBI interrupt |
| Pin 26 | RB5/KBI1/PGM — PORTB bit 5 / KBI interrupt / LVP programming |
| Pin 27 | RB6/KBI2/PGC — PORTB bit 6 / KBI / ICSP clock |
| Pin 28 | RB7/KBI3/PGD — PORTB bit 7 / KBI / ICSP data |
| Pin 29 | VSS — Ground reference |
| Pin 30 | VDD — Positive supply 4.2-5.5 V |
| Pin 31 | VSS — Ground reference |
| Pin 32 | RD0 — PORTD bit 0 |
| Pin 33 | RD1 — PORTD bit 1 |
| Pin 34 | RD2 — PORTD bit 2 |
| Pin 35 | RD3 — PORTD bit 3 |
| Pin 36 | RC3 — PORTC bit 3 |
| Pin 37 | RD4 — PORTD bit 4 |
| Pin 38 | RD5 — PORTD bit 5 |
| Pin 39 | RD6 — PORTD bit 6 |
| Pin 40 | RD7 — PORTD bit 7 |
Typical Applications
PIC18F4450-I/P is suitable for 7 applications: USB HID Keyboard and Mouse, USB-to-UART Serial Bridge, Embedded Sensor Data Logger, Industrial Control Panel Interface, Educational Microcontroller Trainer Board, Custom USB Bulk Transfer Device, USB-Connected Sensor Read-Out Board.
USB HID Keyboard and Mouse
The PIC18F4450-I/P is well suited to USB Human Interface Devices such as keyboards, mice, game controllers, and custom HID peripherals because it integrates a USB 2.0 Full-Speed transceiver with internal pull-up, eliminating the external interface IC. With 34 I/O pins it can scan a 6x6 matrix keyboard or read multiple buttons and encoders, while the 16 KB Flash is ample for HID descriptor tables, key debounce logic, and USB class firmware. The 48 MHz system clock supports the required 12 Mbit/s signaling, and 768 bytes RAM buffers HID reports without CPU stall. Used with the free Microchip MCHPFSUSB framework, a working USB HID device can be brought up in a day of development.
Recommended
USB-to-UART Serial Bridge
In a USB-to-UART bridge dongle the PIC18F4450-I/P runs the CDC class driver from its internal USB transceiver, presenting a virtual COM port to the host while reading and writing bytes through its hardware EUSART at up to 115200 baud or higher. The on-chip USB SIE handles enumeration and suspend/resume, freeing the CPU to buffer characters and manage line-control signaling (RTS/CTS) through GPIO. Its 4.2-5.5 V supply range matches USB VBUS directly, and the 40-pin PDIP package suits through-hole prototype dongles. Compared to an FTDI cable, this approach is lower cost for high-volume OEM adapters, and the free Microchip CDC framework eliminates licensing fees.
Recommended
Embedded Sensor Data Logger
For a low-cost standalone data logger the PIC18F4450-I/P reads up to 13 analog sensors through its 10-bit ADC, time-stamps samples via a 16-bit timer, and stores results in the 256-byte EEPROM or streams to a host over USB. The 48 MHz CPU converts ADC channels at tens of kilohertz while leaving bandwidth for USB bulk transfers, and the nanoWatt sleep modes reduce quiescent current to under 2 uA for battery-powered deployments. The 40-pin PDIP footprint is breadboard-friendly for prototype hardware, and its 5 V tolerance on most I/O simplifies interfacing to legacy 5 V analog sensors that 3.3 V microcontrollers cannot read directly.
Recommended
Industrial Control Panel Interface
The PIC18F4450-I/P can drive a small industrial HMI panel by scanning an 8x4 matrix keypad through its 34 I/O lines, refreshing a character LCD through the MSSP SPI, and reporting operator events back to a PLC over USB. Its 4.2-5.5 V operation tolerates noisy 24 V-derived industrial rails when paired with proper TVS and bulk filtering, and the 85C industrial temperature grade supports factory-floor enclosures. The 16 KB Flash fits menu and ModBus state machine code comfortably, while the 768-byte RAM handles display buffers. Compared to a separate keyboard controller IC, integrating the MCU eliminates extra components and BOM cost.
Recommended
Educational Microcontroller Trainer Board
The PIC18F4450-I/P is an excellent MCU for university and training labs because the 40-pin PDIP package is breadboard-compatible, eliminating the soldering needed for SMD variants and allowing students to swap parts on a programmer socket. The on-chip USB simplifies programming and serial I/O demonstrations without external interface ICs, and the 16 KB Flash plus 768 bytes RAM is sufficient for class projects on interrupt-driven design, ADC sampling, and PWM motor control. The free MPLAB X IDE and XC8 C compiler remove licensing barriers, and the large Microchip PIC18F community provides example projects, application notes, and textbook tutorials.
Recommended
Custom USB Bulk Transfer Device
Engineers building proprietary USB bulk endpoints for test fixtures, firmware uploaders, or high-throughput sensor streaming benefit from the PIC18F4450-I/P's on-chip USB 2.0 Full-Speed (12 Mbit/s) transceiver and 16 KB Flash for class driver code. The 48 MHz CPU sustains bulk endpoint traffic with low interrupt latency, and the 768-byte RAM doubles as a USB endpoint buffer. The 40-pin PDIP package simplifies through-hole field replacement in test rigs, while the 5 V VBUS-direct supply avoids the need for a 3.3 V regulator. Used with the Microchip USB stack, custom bulk pipelines reach roughly 1 MB/s end-to-end, sufficient for many bench-instrument data links.
Recommended
USB-Connected Sensor Read-Out Board
A USB-tethered sensor read-out board using the PIC18F4450-I/P streams 10-bit ADC conversions to a host at up to several kilosamples per second while the host configures acquisition parameters over USB control transfers. The 13 ADC channels cover thermocouples, photodiodes, and bridge sensors, while 16 KB Flash fits calibration tables and digital filtering. The 34 I/O pins provide digital control outputs to the analog front-end, and the 5 V operation matches many precision analog ICs without level shifters. Compared to off-the-shelf DAQ cards, this approach delivers a low-cost USB-native channel for lab automation.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F4450-I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F4550-I/P | PIC18F4458-I/P | PIC18F4455-I/P | PIC18LF4450-I/P | PIC18F45K50-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP | 40-pin PDIP (same) | 40-pin PDIP (same) | 40-pin PDIP (same) | 40-pin PDIP (same) | 40-pin PDIP (same) |
| Flash | 16 KB | 32 KB | 24 KB | 24 KB | 16 KB | 32 KB |
| RAM | 768 bytes | 2048 bytes | 1024 bytes | 1024 bytes | 768 bytes | 2048 bytes |
| Max CPU Clock | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) | 48 MHz (16 MIPS) |
| USB 2.0 FS | Yes (internal transceiver) | Yes | Yes | Yes | Yes | Yes |
| ADC | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels | 10-bit, 13 channels |
| Operating 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 | 2.0 V to 5.5 V (wide VDD) | 1.8 V to 5.5 V (XLP) |
| I/O Pins | 34 | 34 | 34 | 34 | 34 | 34 |
Key Differentiators
- On-chip USB 2.0 Full-Speed transceiver with internal 1.5 kohm pull-up (vs PIC18F4550-I/P)
- Industrial-grade -40C to +85C operating temperature (vs PIC18F4550-I/P)
- 40-pin PDIP through-hole package (vs PIC18F4450-I/ML (44-pin QFN))
Design Notes
Place a 100 nF decoupling capacitor within 3 mm of each VDD pin (pins 20 and 30) and a bulk 10 uF tantalum or ceramic capacitor on the same net. The PIC18F4450 has a separate VUSB pin (pin 14) that powers the internal USB transceiver; connect a 220 nF capacitor from VUSB to VSS to stabilize the internal 3.3 V regulator, otherwise USB signal integrity degrades and enumeration can fail on bus-powered designs.
Route the USB D+ (pin 16) and D- (pin 15) traces as a 90 ohm differential pair with no stubs, length-matching within 150 mil, and keep them at least 50 mil away from switching signals or clock lines. Place the 1.5 kohm pull-up (typically to VUSB or 3.3 V via a software-controlled pin) as close to the D+ line as possible. Without this layout discipline the device may fail USB compliance certification or exhibit intermittent enumeration failures on hub connections.
USB operation requires the CPU to run from a 48 MHz system clock, which in turn requires an HS or HSPLL oscillator mode with an external 4, 8, 12, 16, 20, 24, or 48 MHz crystal. Configuring the PLL without selecting HSPLL in the CONFIG1H register is a common mistake that prevents enumeration. Also, do not omit the configuration fuse settings for WDT, BOR, and LVP - the default LVP state can interfere with high-voltage ICSP programmer operation.
The PIC18F4450-I/P in a 40-pin PDIP package has thermal resistance theta_JA of roughly 50 C/W in still air, but the typical 5 V / 48 MHz / 13 mA active draw means power dissipation is only about 65 mW - well below thermal limits. Estimated: at maximum supply current of 35 mA at 5 V the package would rise approximately 8.75 C above ambient, so no heatsink is required even at 85C industrial ambient.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified (industrial grade only). Conflict-minerals compliant per Microchip supply chain disclosure.
