PIC18F45J11T-I/ML - 8-bit 48MHz 32KB Flash MCU QFN-44 | Microchip
MPN: PIC18F45J11T-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.1 | $5.10 |
| 10 | $4.58 | $45.80 |
| 100 | $4.07 | $407.00 |
| 500 | $3.62 | $1,810.00 |
| 1,000 | $3.2 | $3,200.00 |
PIC18F45J11T-I/ML Overview
What is a PIC18 J-series microcontroller? The PIC18 J-series is Microchip's high-performance 8-bit MCU family built on an enhanced Harvard RISC architecture with a 16-bit instruction word. It belongs to the broader microcontroller -> embedded controller -> semiconductor device taxonomy and is differentiated from K-series parts by its 2.0-3.6V core-only supply architecture (no internal 5V regulator), which lowers active current but requires a clean 3.3V rail. The 'J' family adds nanoWatt XLP power management, Peripheral Pin Select (PPS) for flexible signal routing, and a true 12-bit ADC rather than the 10-bit ADC found on F-series predecessors.
Key features include 32 KB self-programmable Flash with configurable write protection, 1 KB of dedicated EEPROM emulation area in Flash, a 12-bit A/D converter with up to 13 input channels and 100 ksps conversion rate, two 8-bit timers plus three 16-bit timers, a hardware Real-Time Clock/Calendar (RTCC) with its own low-power oscillator, and an integrated full-speed USB 2.0 device controller that eliminates the need for an external PHY.
Architecturally, the device uses a single 2.0-3.6V supply and a 16 MHz internal oscillator (4x PLL to 48 MHz), enabling system cost reduction by removing the external crystal in many designs. The nanoWatt XLP technology provides multiple low-power modes including Deep Sleep with currents as low as 20 nA typical, Run, Idle, and Sleep modes with selective peripheral clock gating, making the device well suited for battery-powered or energy-harvesting designs.
Typical applications include USB peripherals (HID, CDC, custom class), industrial sensor nodes, low-power data loggers, motor control signal conditioning, home appliance user interfaces, and point-of-sale terminals. The integrated USB peripheral significantly reduces BOM cost for HID-class devices such as keyboards, mice, and custom USB input gadgets.
When designing with this device, note that the core runs from 2.0-3.6V directly - there is no internal 5V-to-3.3V LDO. Systems that previously used a 5V PIC18F part must add a 3.3V regulator. The exposed thermal pad on the QFN package must be soldered to the PCB ground plane for thermal dissipation and electrical performance; failure to solder the EP can cause erratic operation at high clock speeds.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Drop-in alternatives for PIC18F45J11T-I/ML — 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 PIC18F45J11T-I/ML (same form factor and footprint) — differing in ADC, Core Architecture, Package, Program Memory (Flash), Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F45J11-I/ML
✅ Drop-In✓ In Stock
$3.25 / Unit
View Datasheet →PIC18F46J11T-I/ML
✅ Drop-In✓ In Stock
$3.46 / Unit
View Datasheet →PIC18F45J10T-I/ML
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC18F44J11T-I/ML
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18F4585T-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4520-E/ML
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →PIC18F45J11T-I/ML Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit RISC, Harvard) |
| Program Memory (Flash) | 32 KB |
| RAM | 3.8 KB |
| EEPROM | Emulated in Flash |
| Maximum CPU Speed | 48 MHz (12 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| I/O Pins | 36 |
| ADC | 12-bit, up to 13 channels, 100 ksps |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Communication | 2x UART, 2x SPI, 2x I2C, 1x USB 2.0 FS device |
| Package | QFN-44 (8x8 mm) with Exposed Pad |
| Operating Temperature | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
PIC18F45J11T-I/ML Pin Configuration
| Pin 1 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Pin 2 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Pin 3 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Pin 4 | RA3/AN3 — Port A bit 3 / Analog input 3 |
| Pin 5 | RA4/AN4 — Port A bit 4 / Analog input 4 |
| Pin 6 | RA5/AN5 — Port A bit 5 / Analog input 5 |
| Pin 7 | RA6 — Port A bit 6 |
| Pin 8 | RA7 — Port A bit 7 |
| Pin 9 | VSS — Ground |
| Pin 10 | VDD — Positive supply (2.0-3.6V) |
| Pin 11 | RB0/AN12 — Port B bit 0 / Analog input 12 |
| Pin 12 | RB1/AN10 — Port B bit 1 / Analog input 10 |
| Pin 13 | RB2/AN8 — Port B bit 2 / Analog input 8 |
| Pin 14 | RB3/AN9 — Port B bit 3 / Analog input 9 |
| Pin 15 | RB4 — Port B bit 4 |
| Pin 16 | RB5 — Port B bit 5 |
| Pin 17 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 18 | RB7/PGD — Port B bit 7 / ICSP data |
| Pin 19 | RC0 — Port C bit 0 |
| Pin 20 | RC1 — Port C bit 1 |
| Pin 21 | RC2 — Port C bit 2 |
| Pin 22 | VUSB — USB internal transceiver supply |
| Pin 23 | D- — USB data minus |
| Pin 24 | D+ — USB data plus |
| Pin 25 | RC3 — Port C bit 3 |
| Pin 26 | RC4 — Port C bit 4 |
| Pin 27 | RC5 — Port C bit 5 |
| Pin 28 | RC6 — Port C bit 6 |
| Pin 29 | RC7 — Port C bit 7 |
| Pin 30 | RD0 — Port D bit 0 |
| Pin 31 | RD1 — Port D bit 1 |
| Pin 32 | RD2 — Port D bit 2 |
| Pin 33 | RD3 — Port D bit 3 |
| Pin 34 | RD4 — Port D bit 4 |
| Pin 35 | RD5 — Port D bit 5 |
| Pin 36 | RD6 — Port D bit 6 |
| Pin 37 | RD7 — Port D bit 7 |
| Pin 38 | VSS — Ground |
| Pin 39 | VDD — Positive supply (2.0-3.6V) |
| Pin 40 | RE0/AN6 — Port E bit 0 / Analog input 6 |
| Pin 41 | RE1/AN7 — Port E bit 1 / Analog input 7 |
| Pin 42 | RE2/AN11 — Port E bit 2 / Analog input 11 |
| Pin 43 | MCLR — Master clear reset (active low) |
| Pin 44 | OSC1 — Crystal oscillator input / external clock |
| Pin EP | EP — Exposed thermal pad (must be soldered to ground plane) |
Typical Applications
PIC18F45J11T-I/ML is suitable for 6 applications: USB HID Peripheral Devices, Industrial Sensor Nodes, Low-Power Data Loggers, Home Appliance User Interfaces, Point-of-Sale Terminals, Motor Control Signal Conditioning.
USB HID Peripheral Devices
The PIC18F45J11T-I/ML is purpose-built for USB peripherals thanks to its integrated full-speed USB 2.0 device SIE and transceiver. The chip provides 13 ADC channels, 36 I/O pins, and 32 KB of Flash to host a USB stack plus application code for HID-class devices such as keyboards, mice, custom input controllers, and gamepads. Its 12 MIPS throughput at 48 MHz comfortably handles HID polling rates of 1000 Hz with room for debouncing and LED control. Designers save the $0.30-0.50 BOM cost of an external USB PHY and the PCB area it requires.
Recommended
Industrial Sensor Nodes
The PIC18F45J11T-I/ML suits industrial 4-20mA sensor transmitter designs where 3.3V operation, 12-bit ADC accuracy, and reliable serial communication are required. Its 13-channel 12-bit ADC delivers 100 ksps for simultaneous multi-sensor scanning, while 2x UART supports RS-485 via external transceiver and 2x I2C handles digital sensor side-channels. nanoWatt XLP Deep Sleep mode at 20 nA typical enables battery-powered wireless sensor nodes that wake on interrupt, making the part practical for years-long deployment on a single CR2032 cell.
Recommended
Low-Power Data Loggers
Battery-powered data loggers benefit from the PIC18F45J11T-I/ML's nanoWatt XLP technology, 12-bit ADC, and integrated RTCC with backup oscillator. The Deep Sleep mode at 20 nA keeps total quiescent draw negligible while the RTCC timestamps events and wakes the CPU for periodic ADC sampling. 32 KB Flash stores roughly 8,000 16-bit ADC readings plus headers, and the 3.8 KB RAM holds the working set during active bursts. A typical 2.0-3.6V CR2/CR2032 deployment can run for 5+ years logging environmental data.
Recommended
Home Appliance User Interfaces
The PIC18F45J11T-I/ML drives appliance HMI panels with capacitive touch, LED indicators, and segmented LCDs thanks to its 36 I/O pins, 3.8 KB RAM for button matrices, and PWM-capable timers. The 48 MHz CPU decodes multiple switch inputs and updates displays without missing events, while the 2.0-3.6V supply directly matches modern appliance power trees. PPS remapping lets designers route peripherals to any available pin, simplifying PCB layout when the mechanical design constrains signal placement.
Recommended
Point-of-Sale Terminals
Compact POS peripherals leverage the PIC18F45J11T-I/ML's USB for tethering to a host PC, its 12-bit ADC for analog barcode/light-pen sensing, and its UART for serial peripherals. 32 KB Flash holds USB CDC plus custom protocol stacks, and the 3.3V supply simplifies powering from USB VBUS via an LDO. The integrated USB eliminates the external PHY, saving PCB area in form-factor-constrained barcode scanners, mag-stripe readers, and customer displays.
Recommended
Motor Control Signal Conditioning
The PIC18F45J11T-I/ML conditions feedback signals for low-power BLDC and stepper motor control loops by sampling current shunts through its 12-bit ADC at 100 ksps and timing commutation events with its 16-bit timers. While not a full motor-control MCU, it acts as an effective companion controller for secondary tasks like sensor fusion, fault logging, or inter-MCU communication over UART/SPI. The 3.3V supply rails pair cleanly with gate drivers like the MCP14 series for compact motor subsystems.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F45J11T-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F45J11-I/ML | PIC18F46J11T-I/ML | PIC18F45J10T-I/ML | PIC18F44J11T-I/ML | PIC18F4585T-I/ML | PIC18F4520-E/ML |
|---|---|---|---|---|---|---|---|
| Package | QFN-44 (8x8 mm) | QFN-44 (8x8 mm) - same | QFN-44 (8x8 mm) - same | QFN-44 (8x8 mm) - same | QFN-44 (8x8 mm) - same | QFN-44 (8x8 mm) - same | QFN-44 (8x8 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 64 KB | 32 KB | 32 KB | 48 KB | 32 KB |
| Supply Voltage | 2.0-3.6 V | 2.0-3.6 V | 2.0-3.6 V | 2.0-3.6 V | 2.0-3.6 V | 4.2-5.5 V | 4.2-5.5 V |
| USB | USB 2.0 FS device | USB 2.0 FS device | USB 2.0 FS device | No USB | USB 2.0 FS device | USB 2.0 FS device | No USB |
| ADC | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 10-bit | 10-bit |
| CPU Speed | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 40 MHz / 10 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 40 MHz / 10 MIPS |
| I/O Pins | 36 | 36 | 36 | 32 | 34 | 36 | 36 |
Key Differentiators
- Integrated USB 2.0 Full-Speed device transceiver (vs PIC18F45J10T-I/ML)
- 12-bit ADC versus legacy 10-bit ADC (vs PIC18F4520-E/ML)
- Same QFN-44 footprint as larger Flash variant (vs PIC18F46J11T-I/ML)
Design Notes
The PIC18F45J11T-I/ML requires a clean 2.0-3.6V supply on VDD; there is no internal 5V regulator. Use a low-noise LDO such as the MCP1700 (3.3V, 250 mA) to derive VDD from a 5V rail or USB VBUS. Decouple each VDD pin with a 100 nF ceramic cap placed within 5 mm of the pin, plus a 10 uF bulk cap at the regulator output. Estimated: with 48 MHz operation and full I/O toggle, VDD current peaks at ~25 mA, so the regulator must source at least 50 mA to maintain margin during inrush and USB enumeration.
The QFN-44 exposed thermal pad (EP) MUST be soldered to a ground copper pour of at least 25 mm^2 to meet the datasheet's thermal resistance specification and to provide a low-inductance ground return. Failure to solder the EP can cause intermittent USB communication failures, ADC offset drift, and latch-up under load. Estimated: a properly-soldered EP on a 25 mm^2 2-oz copper pour yields theta_JA around 30 C/W - more than sufficient for the device's <100 mW typical dissipation.
Place the 12 MHz or 16 MHz crystal within 5 mm of the OSC1/OSC2 pins and guard the traces with a grounded copper pour to minimize radiated EMI. Keep USB D+/D- traces length-matched within 2 mm and route them away from switching signals or noisy rails. According to the datasheet, the VUSB pin requires a 220 nF decoupling capacitor to VDD, separate from the bulk decoupling, to supply the internal USB transceiver during transitions.
Do not assume the J-series parts are 5V tolerant like the F-series. According to the datasheet, applying 5V to any I/O pin on a powered PIC18F45J11T-I/ML will damage the device. Use level translators such as the MCP23S17 or voltage dividers when interfacing to 5V peripherals. Also note that PPS (Peripheral Pin Select) must be unlocked before reassigning peripheral functions - the developer must set IOLOCK to 0 first or firmware will lock up.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - not intended for automotive safety applications.
