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
What are the key features of PIC18F4550T-I/ML?
- 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
What is PIC18F4550T-I/ML used for?
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.
What are the specifications of PIC18F4550T-I/ML?
| 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 |
Where can I find the PIC18F4550T-I/ML datasheet?
PIC18F4550T-I/ML Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for PIC18F4550T-I/ML?
Compatible alternatives and drop-in replacements for PIC18F4550T-I/ML:
suggested
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.
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