PIC18F4550T-I/ML Microchip Integrated Circuit (Quad Flat No-Lead) In Stock
Microchip PIC18F4550T-I/ML is an 8-bit PIC18 microcontroller with 32 KB flash, 48 MHz clock, and integrated full-speed USB 2.0 in a compact 44-pin QFN package. Supports 2.5 V, 3.3 V, and 5 V operation with onboard ADC, PWM, and MSSP serial peripherals for versatile embedded connectivity. Available in tape and reel for automated assembly in USB HID, data logger, and sensor interface applications.
- Manufacturer
- Microchip
- Package
- Quad Flat No-Lead
- Pin Count
- 44
- Lifecycle
- ACTIVE
- Datasheet
- PIC18F4550T-I/ML Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $5.3300(MOQ 100)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Integrated full-speed USB 2.0 device/OTG controller with on-chip 1 KB dual-port USB RAM
- 48 MHz PIC18 RISC core delivering 12 MIPS for efficient 8-bit embedded processing with USB stack overhead
- 32 KB flash program memory with 2 KB EEPROM for non-volatile parameter storage without external memory ICs
- Wide supply voltage range of 2.0 V to 5.5 V enabling 3.3 V and 5 V system designs from a single device variant
- 44-pin QFN package with exposed thermal pad enabling compact USB peripheral PCB designs
Applications
The PIC18F4550T-I/ML is well-suited for USB HID devices, custom USB peripherals, and data logging instruments that require a low-cost 8-bit controller with integrated USB 2.0 full-speed connectivity at up to 12 Mbps. Its 32 KB flash accommodates a complete USB stack alongside application code for sensor interfaces, MIDI controllers, and laboratory measurement instruments. The wide 2.0 V to 5.5 V supply range and compact QFN package enable both battery-powered USB accessories and bus-powered 5 V USB devices in a single hardware platform.
Specifications
| Pbfree Code | Yes |
| Manufacturer Package Code | QFN-44 |
| Factory Lead Time | 7Weeks |
| YTEOL | 9 |
| Has ADC | YES |
| Bit Size | 8 |
| Boundary Scan | NO |
| CPU Family | PIC18 |
| Clock Frequency-Max | 48MHz |
| DAC Channels | NO |
| DMA Channels | NO |
| Format | FIXED POINT |
| Integrated Cache | NO |
| JESD-30 Code | S-PQCC-N44 |
| JESD-609 Code | e3 |
| Low Power Mode | YES |
| Number of External Interrupts | 3 |
| Number of I/O Lines | 35 |
| Number of Serial I/Os | 1 |
| Number of Timers | 4 |
| On Chip Data RAM Width | 8 |
| On Chip Program ROM Width | 8 |
| PWM Channels | YES |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | LCC44,.31SQ,25 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| RAM (bytes) | 2048 |
| ROM (words) | 32768 |
| ROM Programmability | FLASH |
| Screening Level | TS 16949 |
| Speed | 48MHz |
| Supply Current-Max | 50mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 4.2V |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.65mm |
| Terminal Position | QUAD |
| uPs/uCs/Peripheral ICs Type | MICROCONTROLLER, RISC |
| ## PIC18F4550T-I/ML Alternates Showing results | Image |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | 3A991.A.2 |
| HTS Code | 8542.31.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for PIC18F4550T-I/ML:
suggested
suggested
suggested
RISC Microcontroller, 8-Bit, FLASH, PIC18 CPU, 48MHz, CMOS, PQCC44
RISC Microcontroller, 8-Bit, FLASH, PIC18 CPU, 48MHz, CMOS, PQCC44
RISC Microcontroller, 8-Bit, FLASH, PIC18 CPU, 48MHz, CMOS, PQCC44
Frequently Asked Questions
What USB transfer types does PIC18F4550T-I/ML support and what peak throughput can it achieve?
The PIC18F4550T-I/ML supports USB 2.0 full-speed at 12 Mbps and implements all four USB transfer types: control, interrupt, bulk, and isochronous. For a bulk transfer data logger application, sustained throughput of approximately 800 KB/s is achievable in practice, as USB full-speed bulk transfers are limited to 64-byte packets per frame at 1 ms intervals. For isochronous audio at 48 kHz stereo 16-bit, the 192 bytes per ms USB bandwidth is well within the 1 KB dual-port USB RAM capacity of the device.
How does the 2 KB onboard EEPROM in PIC18F4550T-I/ML benefit calibration-heavy sensor designs?
The 2 KB EEPROM on the PIC18F4550T-I/ML provides byte-erasable non-volatile storage rated for 100000 write cycles, allowing individual calibration coefficients to be updated without erasing an entire flash page. For a 10-channel sensor logger storing 2-byte offset and gain values per channel, the 2 KB EEPROM holds 100 complete calibration records, enabling per-unit factory calibration and field recalibration over USB without reflashing the application firmware.
For a USB HID joystick design, does PIC18F4550T-I/ML have enough ADC channels and resolution to sample multiple axes?
Yes. The PIC18F4550T-I/ML integrates a 10-bit ADC with up to 13 input channels. A 4-axis joystick with X, Y, Z, and throttle potentiometers can be sampled simultaneously across 4 channels, delivering 1024-count resolution per axis, which exceeds the 8-bit (256-count) resolution required by standard USB HID joystick descriptors. The ADC sampling rate at 48 MHz clock reaches approximately 100 ksps per channel, enabling 25 kHz update rates for all 4 axes with significant processing headroom for USB packet formatting.
Is PIC18F4550T-I/ML a suitable choice to replace a larger DIP package in an existing USB design needing smaller board area?
Yes. The PIC18F4550T-I/ML in a 44-pin QFN package measures 8 mm × 8 mm with an exposed thermal pad, compared to a 44-pin TQFP at 10 mm × 10 mm or a 40-pin DIP at roughly 52 mm × 14 mm. The QFN footprint saves approximately 75% board area versus the DIP variant, making it practical for shrinking an existing USB prototype to a production design on a PCB under 30 mm × 30 mm while maintaining the same PIC18F4550 firmware binary.
Related Guides
How to Choose a 3528 SMD Indicator LED for Blue Status Lighting: Selection Guide
A practical 3528 SMD indicator LED selection guide using 150141BS73100 and related Wurth 150141 variants for blue status lighting.
Jul 5, 2026
BAS70KFILM Design Guide for Low-Leakage Signal Clamping and RF Detector Inputs
Practical BAS70KFILM design guidance for signal clamps, RF detector inputs, leakage control, capacitance, layout, and sourcing alternatives.
Jul 5, 2026
How to Choose a BAS70 Schottky Diode for Signal Clamping: Selection Guide
A practical BAS70KFILM and BAS70-family Schottky diode selection guide for signal clamping, RF detection, leakage, and topology choices.
Jul 4, 2026
AMC1202DWVR Design Guide for Isolated Current Sensing
Practical AMC1202DWVR design guide covering shunt sizing, isolation layout, input filtering, ADC scaling, and sourcing choices.
Jul 4, 2026
Why Buy from FindMyChip
About Microchip
Microchip is a leading electronic component manufacturer. FindMyChip sources Microchip ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 100+ | $6.1200 | $612.00 |
| 1000+ | $5.6200 | $5620.00 |
| 5000+ | $5.3300 | $26650.00 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”