PIC18LF45J11T-I/PT - 8-bit MCU, 32KB Flash, 4KB RAM | Microchip
MPN: PIC18LF45J11T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.62 | $4.62 |
| 10 | $4.05 | $40.50 |
| 100 | $3.51 | $351.00 |
| 500 | $3.05 | $1,525.00 |
| 1,000 | $2.72 | $2,720.00 |
PIC18LF45J11T-I/PT Overview
An 8-bit microcontroller (MCU) is a programmable system-on-chip that integrates a CPU, Flash program memory, SRAM data memory, peripherals and I/O on a single die. PIC18 LF J11 series parts add nanoWatt Technology power management (multiple idle/sleep modes) and a full-speed USB 2.0 full-speed peripheral on the J11 die revision, extending the classic PIC18 family hierarchy (PIC10/12/16/18) into connected embedded nodes.
Key features include 34 I/O pins, internal 31 kHz to 8 MHz oscillator with PLL, 10-bit ADC up to 13 channels, two USARTs, two MSSP (SPI/I2C) ports, and nanoWatt power-saving modes that drop typical run currents below 1 mA/MHz. Program memory is self-programmable under firmware control, enabling in-application upgrades.
The LF (low-voltage) silicon supports 2.0V to 5.5V operation across -40C to +85C industrial temperature range, making the part a drop-in lower-power sibling of the F-version PIC18F45J11 (2.0V-3.6V-only). The TQFP-44 footprint supports hand-solderable prototyping and standard 0.8 mm-pitch PCB assembly.
Typical applications include USB peripherals (HID, CDC), low-power sensor nodes, industrial control, consumer electronics, and battery-powered instrumentation where nanoWatt idle currents and USB connectivity matter.
When designing, ensure the 5.5V VDDMAX is respected under USB bus-powered transient conditions, and add bulk decoupling per the PIC18 LF J11 family datasheet.
This page synthesizes distributor pricing, drop-in same-package alternatives, and engineering guidance not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18LF45J11T-I/PT — 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 PIC18LF45J11T-I/PT (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Core, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF46J11-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF45J10-I/PT
✅ Drop-In✓ In Stock
$3.32 / Unit
View Datasheet →PIC18LF45J10-I/P
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →PIC18LF45J11T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit Harvard, RISC-like) |
| Program Memory (Flash) | 32 KB |
| Data Memory (SRAM) | 4 KB |
| Maximum CPU Speed | 48 MHz (12 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| Package | TQFP-44 (PT), 10 x 10 mm |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C (Industrial) |
| ADC | 10-bit, up to 13 channels |
| Communication Interfaces | USB 2.0 Full-Speed, 2x USART, 2x MSSP (SPI/I2C) |
| Power-Saving Modes | nanoWatt Technology (Idle, Sleep, Deep Sleep variants) |
| RoHS Status | Compliant |
| Lead-Free / Halogen-Free | Lead-free (PT suffix per Microchip convention); Halogen-free status not specified in retrieved data |
PIC18LF45J11T-I/PT Pin Configuration
| Pin 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Pin 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Pin 3 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC negative reference |
| Pin 4 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC positive reference |
| Pin 5 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 6 | RA5/AN4 — Digital I/O / Analog input 4 |
| Pin 7 | RA6 — Digital I/O |
| Pin 8 | RA7 — Digital I/O |
| Pin 9 | VSS — Ground reference |
| Pin 10 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Pin 11 | RB0/AN12 — Digital I/O / Analog input 12 |
| Pin 12 | RB1/AN10 — Digital I/O / Analog input 10 |
| Pin 13 | RB2/AN8 — Digital I/O / Analog input 8 |
| Pin 14 | RB3/AN9 — Digital I/O / Analog input 9 / I2C SDA (MSSP1) |
| Pin 15 | RB4/AN11 — Digital I/O / Analog input 11 |
| Pin 16 | RB5/AN13 — Digital I/O / Analog input 13 / I2C SCL (MSSP1) |
| Pin 17 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 18 | RB7/PGD — Digital I/O / ICSP data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Pin 21 | RC0 — Digital I/O |
| Pin 22 | RC1 — Digital I/O |
| Pin 23 | RC2 — Digital I/O |
| Pin 24 | RC3 — Digital I/O |
| Pin 25 | RC4/D- — Digital I/O / USB D- |
| Pin 26 | RC5/D+ — Digital I/O / USB D+ |
| Pin 27 | RC6 — Digital I/O / USART1 TX |
| Pin 28 | RC7 — Digital I/O / USART1 RX |
| Pin 29 | VSS — Ground reference |
| Pin 30 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Pin 31 | RD0 — Digital I/O |
| Pin 32 | RD1 — Digital I/O |
| Pin 33 | RD2 — Digital I/O |
| Pin 34 | RD3 — Digital I/O |
| Pin 35 | RD4 — Digital I/O |
| Pin 36 | RD5 — Digital I/O |
| Pin 37 | RD6 — Digital I/O |
| Pin 38 | RD7 — Digital I/O |
| Pin 39 | VSS — Ground reference |
| Pin 40 | VDD — Positive supply voltage (2.0V to 5.5V) |
| Pin 41 | RE0/RD — Digital I/O / Parallel-port read strobe |
| Pin 42 | RE1/WR — Digital I/O / Parallel-port write strobe |
| Pin 43 | RE2/CS — Digital I/O / Parallel-port chip select |
| Pin 44 | MCLR/RE3 — Master Clear reset (active low) / Digital I/O RE3 |
Typical Applications
PIC18LF45J11T-I/PT is suitable for 6 applications: USB HID Peripheral Devices, USB CDC Virtual COM Port Bridges, Low-Power Sensor Node with USB Diagnostics, Industrial Control Front Panels, Consumer Appliance Control Boards, Test and Measurement Dongles.
USB HID Peripheral Devices
The PIC18LF45J11T-I/PT is well suited to USB Human Interface Device (HID) peripherals such as custom keyboards, mice, game controllers, and HID-class sensor readouts. Its integrated USB 2.0 Full-Speed peripheral with on-chip transceiver eliminates external PHY cost, while the 32 KB Flash holds the USB stack plus HID report descriptors with room for application logic. The 4 KB SRAM buffers HID reports comfortably, and the 48 MHz / 12 MIPS core handles polling and report assembly without jitter. The 2.0-5.5V LF process supports bus-powered and self-powered designs. Place a 1.5 kohm pull-up on D+ (full-speed), add ESD protection on D+/D-, and bulk-decouple VDD per the Microchip family datasheet.
Recommended
USB CDC Virtual COM Port Bridges
For USB-to-UART bridge designs (CDC class), the PIC18LF45J11T-I/PT combines a hardware USB 2.0 Full-Speed engine, two hardware USARTs, and 32 KB Flash holding the CDC stack plus application code. Operating at 48 MHz, it can sustain 12 Mbps USB traffic while servicing a USART at up to 5 Mbps. The 2.0-5.5V supply range simplifies 5V-tolerant legacy RS-232/RS-485 conversions. Add a USB-B or USB-C connector, ESD array, and VBUS sensing resistor; configure D+ pull-up via firmware for bus-powered enumeration.
Recommended
Low-Power Sensor Node with USB Diagnostics
The PIC18LF45J11T-I/PT's nanoWatt Technology (Idle / Sleep / Deep Sleep modes with sub-uA quiescent current) makes it ideal for battery-powered sensor nodes that periodically expose diagnostics or logs over USB. The 13-channel 10-bit ADC reads temperature, battery voltage, and analog sensors; deep-sleep current stays low enough for multi-year coin-cell life in intermittent applications. When docked, the USB peripheral powers the node and streams accumulated data. The 2.0-5.5V LF range supports both 3.6V Li-SOCl2 primary cells and 5V USB bus power on the same PCB.
Recommended
Industrial Control Front Panels
Industrial HMI panels with USB service ports use the PIC18LF45J11T-I/PT to drive keypads, character LCDs, LED indicators, and rotary encoders. The 34 I/O pins accommodate 4x4 keyscans, an 8-bit LCD bus, status LEDs, and dedicated peripheral pins for SPI/I2C sensor expansion. The 2.0-5.5V supply is directly compatible with industrial 5V logic rails, and the -40C to +85C industrial temperature range survives factory-floor environments. The 12 MIPS performance refreshes displays without visible flicker.
Recommended
Consumer Appliance Control Boards
In consumer appliances (coffee machines, kitchen hoods, washing-machine front panels), the PIC18LF45J11T-I/PT provides reliable 8-bit control with USB service-port connectivity for firmware updates and diagnostics. Its 32 KB Flash holds USB bootloader plus application code, and 4 KB SRAM supports touch-button debounce and EEPROM emulation. The 5.5V-tolerant LF silicon interfaces directly with 5V triac drivers and relay coils. The TQFP-44 footprint is friendly to low-cost 2-layer FR-4 boards, and nanoWatt sleep modes reduce idle consumption below Energy Star thresholds.
Recommended
Test and Measurement Dongles
The PIC18LF45J11T-I/PT fits USB-attached test and measurement dongles - simple oscilloscope probes, logic analyzers with USB streaming, USB-controlled power-supply programmers, and laboratory data loggers. Its 48 MHz core, 10-bit ADC, and 2 USARTs enable basic waveform sampling and digital-protocol bridging (SPI/I2C/UART to USB). The 32 KB Flash accommodates vendor-specific USB descriptors plus measurement firmware, and 4 KB SRAM buffers ADC samples before USB transmission. The 2.0-5.5V supply rails support both USB bus power and external bench supply operation.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF45J11T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF46J11-I/PT | PIC18LF45J10-I/PT | PIC18LF45J10-I/P |
|---|---|---|---|---|
| Package | TQFP-44 (PT) | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (P) - same family; NOT pin-compatible |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Flash | 32 KB | 64 KB (+100%) | 32 KB (same) | 32 KB (same) |
| SRAM | 4 KB | 4 KB (same) | 2 KB (-50%) | 2 KB (-50%) |
| CPU Speed | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS (same) | 48 MHz / 12 MIPS (same) | 48 MHz / 12 MIPS (same) |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V (same) | 2.0 V to 5.5 V (same) | 2.0 V to 5.5 V (same) |
| USB Peripheral | Yes (USB 2.0 Full-Speed) | Yes (USB 2.0 Full-Speed) - same | Yes (USB 2.0 Full-Speed) - same | Yes (USB 2.0 Full-Speed) - same |
| I/O Pins | 34 | 34 (same) | 34 (same) | 34 (same) |
| NanoWatt Power Saving | Yes | Yes - same | Yes - same | Yes - same |
Key Differentiators
- Larger SRAM than PIC18LF45J10-I/PT (vs PIC18LF45J10-I/PT)
- Lower Flash than PIC18LF46J11-I/PT (vs PIC18LF46J11-I/PT)
- 5V-tolerant LF silicon vs 3.3V-only F silicon (vs PIC18F45J11T-I/PT (F variant))
Design Notes
The PIC18LF45J11T-I/PT operates from 2.0V to 5.5V on the LF process. For USB bus-powered designs, ensure VBUS does not exceed 5.5V under transient conditions - add a TVS diode or Zener clamp. Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pair (the TQFP-44 has multiple VDD pins: 10, 20, 30, 40). A 4.7 uF bulk capacitor near the IC is recommended for ADC reference stability. The nanoWatt Sleep and Deep Sleep modes drop quiescent current to microampere levels - disable the USB transceiver before entering Sleep to avoid phantom bus power draw.
TQFP-44 (PT) packages use 0.8 mm lead pitch on a 10 x 10 mm body. Route the USB D+/D- differential pair with 90 ohm characteristic impedance, length-matched within 2 mm, and keep them away from switching traces. Place the 48 MHz crystal/oscillator close to OSC1/OSC2 pins with short, symmetric traces and a guard ground. Multiple VDD/VSS pins reduce inductance; tie all of them to the respective planes, not just one pair. Add a ferrite bead or inductor on VBUS for conducted-EMI compliance on USB designs.
Do not exceed the absolute maximum VDD of 5.5V (LF) or 3.6V (F); the LF variant is required for 5V-tolerant designs. The MCLR pin must have a 10 kohm pull-up to VDD; a hard reset below VDD = 2.0V will brown-out the part. ICSP programming via PGC/PGD (RB6/RB7) requires these pins to be configured correctly in firmware - disable analog selection on RB6/RB7 during programming. For USB Full-Speed operation, the internal 48 MHz PLL must be enabled and stabilized before USB enumeration - allow at least 1 ms startup time after PLL lock.
Compliance Information
RoHS compliance confirmed via Microchip product page. PT suffix indicates lead-free TQFP package per Microchip ordering convention. Halogen-free status not specified in retrieved data and is marked 'unknown'. AEC-Q100 not applicable for non-automotive-grade MCU; the automotive-grade equivalent is the PIC18LF45J11-I/PT vs. PIC18LF45J11T-I/PT tape-and-reel variant. Conflict-minerals compliance per Microchip statement.