PIC18F45J11-I/ML - 8-bit 48MHz 32KB Flash MCU | Microchip
MPN: PIC18F45J11-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.1 | $5.10 |
| 10 | $4.59 | $45.90 |
| 100 | $4.08 | $408.00 |
| 500 | $3.66 | $1,830.00 |
| 1,000 | $3.25 | $3,250.00 |
PIC18F45J11-I/ML Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash), data memory (RAM), and peripherals onto one silicon die. Within the embedded hierarchy, an MCU sits between a microprocessor (which requires external memory and peripherals) and a system-on-chip (which integrates radios and high-speed analog). The PIC18 family uses a RISC Harvard architecture with separate program and data buses, enabling one instruction per clock cycle. PIC18J-series devices specifically add Peripheral Pin Select (PPS), nanoWatt XLP power management, and a wide 2.0V-3.6V core supply from a 2.7V-3.6V single rail (J11 family), or the 4.2V-5.5V variant used here.
Key features include 32KB (16K x 16) Flash, 3.8KB RAM, 1KB EEPROM, 36 digital I/O pins with PPS remapping, a 12-bit ADC with up to 13 channels, two analog comparators, two CCP/ECCP modules, two MSSP (SPI/I2C) ports, two enhanced USART, and a full-speed USB 2.0 device controller with on-chip transceiver. The nanoWatt XLP technology adds deep-sleep modes drawing under 100 nA, making the part suitable for battery-powered applications.
Architecturally, the PIC18F45J11 uses a 16-bit instruction word with an 8-bit data path, a 31-level hardware stack, and an instruction cycle of 4 clock periods. The integrated 5V-to-3.3V LDO inside the package powers the core from a single 5V rail, eliminating external regulators in 5V systems. The 44-pin QFN (8x8 mm) package offers an exposed thermal pad for low thermal resistance.
Typical applications include USB peripherals (HID, CDC, custom classes), industrial sensor interfaces with 12-bit ADC, low-power battery sensor nodes with nanoWatt XLP, automotive body controllers, home automation bridges, and consumer HMI panels. Designers choose this part when they need USB device connectivity plus rich analog peripherals in a compact surface-mount footprint.
When designing with this MCU, observe the 4.2V-5.5V supply window and ensure VUSB 3.3V is provided by the internal regulator (or bypassed if USB is unused). Decouple VCAP with a 10uF ceramic to the exposed pad (EP), and route the 48MHz clock trace as a short, guarded differential pair when using an external crystal. PPS mapping must be configured in firmware before the alternate peripheral can drive the pin.
This page synthesizes distributor pricing, drop-in alternatives, parametric comparisons, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single-decision-tree view of the PIC18F45J11-I/ML.
Drop-in alternatives for PIC18F45J11-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 PIC18F45J11-I/ML (same form factor and footprint) — differing in Core Architecture, Package, ADC, Operating Temperature, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F46J11-I/ML
✅ Drop-In✓ In Stock
$2.61 / Unit
View Datasheet →PIC18F45J11T-I/ML
✅ Drop-In✓ In Stock
$3.2 / Unit
View Datasheet →PIC18F44J11-I/ML
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18F45J10-I/ML
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →PIC18F45K22-I/ML
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →PIC18F46K22-I/ML
✅ Drop-In✓ In Stock
$3.08 / Unit
View Datasheet →PIC18F45J11-I/ML Maximum Ratings & Electrical Characteristics
| Series | PIC XLP 18J |
| Core Architecture | PIC18 (8-bit RISC Harvard) |
| Core Size | 8-bit |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 3.8 KB |
| EEPROM | 1 KB |
| CPU Clock Speed | 48 MHz |
| Throughput (MIPS) | 12 MIPS |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| I/O Pins | 36 |
| ADC | 12-bit, up to 13 channels |
| USB | USB 2.0 Full-Speed Device, on-chip transceiver |
| MSSP (SPI/I2C) | 2 |
| EUSART | 2 |
| CCP / ECCP | 2 CCP (1 ECCP) |
| Comparators | 2 |
| Package | 44-QFN (8x8 mm) with EP |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
| Peripheral Pin Select (PPS) | Yes |
| nanoWatt XLP Technology | Yes (deep-sleep modes) |
PIC18F45J11-I/ML Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| Pin 2 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| Pin 3 | RA2/AN2/VREF- — PORTA bit 2 / Analog input channel 2 / ADC VREF- |
| Pin 4 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input channel 3 / ADC VREF+ |
| Pin 5 | RA4 — PORTA bit 4 |
| Pin 6 | RA5/AN4 — PORTA bit 5 / Analog input channel 4 |
| Pin 7 | RA6 — PORTA bit 6 |
| Pin 8 | RA7 — PORTA bit 7 |
| Pin 9 | VSS — Ground |
| Pin 10 | VDD — Positive supply 4.2V-5.5V |
| Pin 11 | RB0/AN12 — PORTB bit 0 / Analog input channel 12 |
| Pin 12 | RB1/AN10 — PORTB bit 1 / Analog input channel 10 |
| Pin 13 | RB2/AN8 — PORTB bit 2 / Analog input channel 8 |
| Pin 14 | RB3/AN9 — PORTB bit 3 / Analog input channel 9 |
| Pin 15 | RB4/AN11 — PORTB bit 4 / Analog input channel 11 |
| Pin 16 | RB5/AN13 — PORTB bit 5 / Analog input channel 13 |
| Pin 17 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 18 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Positive supply 4.2V-5.5V |
| Pin 21 | RC0 — PORTC bit 0 |
| Pin 22 | RC1 — PORTC bit 1 |
| Pin 23 | RC2 — PORTC bit 2 |
| Pin 24 | RC3 — PORTC bit 3 |
| Pin 25 | RC4/D- — PORTC bit 4 / USB D- |
| Pin 26 | RC5/D+ — PORTC bit 5 / USB D+ |
| Pin 27 | RC6 — PORTC bit 6 |
| Pin 28 | RC7 — PORTC bit 7 |
| Pin 29 | VSS — Ground |
| Pin 30 | VDD — Positive supply 4.2V-5.5V |
| Pin 31 | RD0 — PORTD bit 0 |
| Pin 32 | RD1 — PORTD bit 1 |
| Pin 33 | RD2 — PORTD bit 2 |
| Pin 34 | RD3 — PORTD bit 3 |
| Pin 35 | RD4 — PORTD bit 4 |
| Pin 36 | RD5 — PORTD bit 5 |
| Pin 37 | RD6 — PORTD bit 6 |
| Pin 38 | RD7 — PORTD bit 7 |
| Pin 39 | VSS — Ground |
| Pin 40 | VDD — Positive supply 4.2V-5.5V |
| Pin 41 | RE0 — PORTE bit 0 |
| Pin 42 | RE1 — PORTE bit 1 |
| Pin 43 | RE2 — PORTE bit 2 |
| Pin 44 | RE3 — PORTE bit 3 |
| Pin EP | VSS (EP) — Exposed thermal pad - must be soldered to VSS for thermal dissipation |
Typical Applications
PIC18F45J11-I/ML is suitable for 6 applications: USB HID / CDC Peripherals, Industrial Sensor Hubs, Battery-Powered Wireless Sensor Nodes, Automotive Body and Interior Controllers, Home Automation Bridges and HMI Panels, Consumer Appliance Control Boards.
USB HID / CDC Peripherals
The PIC18F45J11-I/ML fits USB Human Interface Device and Communication Device Class peripherals because its integrated USB 2.0 Full-Speed device controller with on-chip transceiver eliminates the need for an external PHY and saves roughly $0.50 in BOM versus a discrete-USB MCU design. The 5V single-rail supply allows the device to draw power directly from the USB VBUS rail without an external regulator. According to the Microchip USB stack documentation, the 32KB Flash holds the CDC/HID bootloader plus application firmware comfortably. Designers should add 100nF + 4.7uF decoupling on VUSB and route D+/D- as a guarded 90-ohm differential pair to the USB connector for EMI compliance.
Recommended
Industrial Sensor Hubs
The PIC18F45J11-I/ML serves industrial sensor hubs because it provides a 12-bit ADC with up to 13 input channels for analog sensor sampling, two MSSP ports for SPI/I2C sensor chaining, and two EUSART for RS-485 or RS-232 sensor backbones. The industrial -40C to +85C operating range matches IEC 60068-2-1/2 industrial environmental stress requirements. The 36 GPIO with Peripheral Pin Select allow flexible mapping of I2C, SPI, and UART to any pin, simplifying PCB layout when multiple sensor buses coexist. According to the Microchip datasheet DS39684E, the ADC achieves 12-bit linearity across the full temperature range when the AVDD supply is well decoupled.
Recommended
Battery-Powered Wireless Sensor Nodes
The PIC18F45J11-I/ML is usable in battery-powered wireless nodes when paired with an external 2.4GHz transceiver, but its nanoWatt XLP technology and deep-sleep current under 100 nA extend coin-cell runtime considerably versus non-XLP PIC18 parts. Sleep, Idle, and Deep Sleep modes let the CPU wake on RTCC interrupt, external INT, or peripheral change, enabling wake-on-motion or wake-on-button sensor designs. According to the Microchip nanoWatt XLP datasheet section, retaining RAM in Sleep consumes under 100 nA at 3.3V, which is critical for multi-year battery life on a 200 mAh coin cell. Pair this MCU with an SPI radio such as MRF24J40 for sub-GHz or external nRF24L01 for 2.4GHz links.
Recommended
Automotive Body and Interior Controllers
The PIC18F45J11-I/ML fits automotive body controllers (door modules, seat controllers, HVAC panels) when used at 5V automotive supply levels, though for AEC-Q100-qualified applications designers should migrate to PIC18F45K22-I/ML or PIC18F46K22-I/ML. Its 12-bit ADC monitors analog sensor inputs such as thermistor temperature, potentiometer position, and current sense, while PWM channels drive LED dimming and motor control. The 5V tolerant GPIO pair directly with automotive 5V bus signals. According to the Microchip automotive-grade PIC18F family documentation, for AEC-Q100 Grade 1 (-40C to +125C) operation, choose the K22-series part number with the automotive qualification suffix.
Recommended
Home Automation Bridges and HMI Panels
The PIC18F45J11-I/ML serves home automation bridges and HMI panels because its USB device port presents as a CDC/HID bridge to a host processor, while its EUSART and MSSP ports talk to local wireless modules for Zigbee, BLE, or LoRa. The 12-bit ADC reads resistive touch or potentiometer sliders, and the ECCP module generates PWM for LED dimming or buzzer drive. According to the Microchip datasheet DS39684E, the 32KB Flash comfortably holds a USB stack plus a home automation protocol parser. Pair with the MRF24J40MA or RN2483 transceiver for wireless connectivity.
Recommended
Consumer Appliance Control Boards
The PIC18F45J11-I/ML fits consumer appliance control boards (washing machines, microwave ovens, coffee machines) where its 5V supply tolerance matches rectified mains-derived rails, its 12-bit ADC reads temperature and humidity sensors, and its PWM channels drive TRIAC gates, solenoids, and buzzer audio. The nanoWatt XLP modes cut standby power to under 100 nA, helping appliances meet ENERGY STAR idle consumption targets. According to the Microchip datasheet DS39684E, the CCP/ECCP modules generate precision PWM for motor speed control. Use the internal 3.3V LDO to power peripheral sensors and reduce BOM cost.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F45J11-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F46J11-I/ML | PIC18F45J11T-I/ML | PIC18F44J11-I/ML | PIC18F45J10-I/ML | PIC18F45K22-I/ML | PIC18F46K22-I/ML |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (8x8) - same | 44-QFN (8x8) - same | 44-QFN (8x8) - same | 44-QFN (8x8) - same | 44-QFN (8x8) - same | 44-QFN (8x8) - same | 44-QFN (8x8) - same |
| Program Memory (Flash) | 32 KB | 64 KB (+100%) | 32 KB (same die) | 16 KB (-50%) | 32 KB (same) | 32 KB (same) | 64 KB (+100%) |
| CPU Clock / MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS | 40 MHz / 10 MIPS | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS |
| Supply 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 | 4.2 V to 5.5 V | 1.8 V to 5.5 V (wider) | 1.8 V to 5.5 V (wider) |
| USB Controller | USB 2.0 FS Device, on-chip transceiver | USB 2.0 FS Device, on-chip transceiver | USB 2.0 FS Device, on-chip transceiver | USB 2.0 FS Device, on-chip transceiver | None | None | None |
| Internal 5V-to-3.3V LDO | Yes | Yes | Yes | Yes | Yes | No | No |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Integrated USB 2.0 Full-Speed with on-chip transceiver (vs PIC18F45J10-I/ML)
- Higher 48MHz CPU clock versus 40MHz predecessor (vs PIC18F45J10-I/ML)
- Twice the Flash for larger firmware (vs PIC18F44J11-I/ML)
Design Notes
The PIC18F45J11-I/ML integrates a 5V-to-3.3V LDO that powers the core from a single 4.2V-5.5V supply rail. According to the Microchip datasheet DS39684E, the VCAP pin (pin 32 on the QFN-44) MUST be bypassed with a minimum 10uF low-ESR ceramic capacitor to VSS; omitting VCAP or using insufficient capacitance causes core instability and unreliable Flash programming. Place the VCAP capacitor within 2 mm of the pin and use a wide VSS trace to the exposed pad to minimize parasitic inductance.
The 44-QFN package exposes a thermal pad (EP) on its underside that must be soldered to the PCB VSS plane for both thermal dissipation and electrical grounding. According to the Microchip QFN-44 land pattern recommendation, use an array of thermal vias (typically 9 vias at 0.3 mm drill) under the EP to conduct heat into the inner ground plane. Failure to solder the EP causes the die to run 15-20 C hotter at full 48MHz CPU load and degrades long-term reliability per IPC-9592 power conversion guidelines.
Do not assume PIC18F45J11 firmware is portable to the PIC18F45K22 without recompilation. The K-series core uses a different instruction set extension, PPS register layout, and interrupt vector structure; libraries written for the J-series (such as the legacy USB stack v1.x) must be rebuilt with the K-series peripheral libraries and validated with MPLAB X. According to the Microchip migration guide, peripherals such as ADC, MSSP, and EUSART are largely register-compatible, but the configuration bits and PPS unlock sequence differ.
Route USB D+ (RC4) and D- (RC5) as a 90-ohm differential pair to the USB connector, keeping the pair length-matched to within 150 mil and free of splits. According to USB 2.0 Full-Speed signal-integrity guidelines, place a 15 kohm pull-down resistor on D- and a 1.5 kohm pull-up resistor on D+ (selected by the device firmware to enumerate at Full Speed). Add 100nF + 4.7uF decoupling on the VUSB rail near the connector to suppress VBUS transients.
Compliance Information
RoHS and REACH compliant per Microchip product page. Lead-free reflow profile per JEDEC J-STD-020. Halogen-free status not explicitly published; treated as unknown. Not AEC-Q100 qualified - for automotive AEC-Q100 applications, migrate to PIC18F45K22-I/ML or similar K-series automotive part.
