PIC18LF2520-I/ML - 32KB Flash 8-bit MCU 40MHz 28-QFN | Microchip
MPN: PIC18LF2520-I/ML ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.36 | $6.36 |
| 10 | $5.72 | $57.20 |
| 100 | $5.21 | $521.00 |
| 500 | $4.78 | $2,390.00 |
| 1,000 | $4.32 | $4,320.00 |
PIC18LF2520-I/ML Overview
An 8-bit microcontroller (MCU) is a single-chip computer that combines an 8-bit CPU, program memory (Flash), data memory (RAM), and a fixed set of peripherals (I/O ports, timers, ADC, communication blocks) into one IC. PIC18F-family devices sit in the hierarchy 8-bit MCU -> RISC flash MCU -> Microchip PIC18 -> 16-bit enhanced core with 77 instructions and hardware multiply, optimized for C compilers and small-footprint embedded control.
Key features include 25 digital I/O pins, a 10-bit ADC with up to 10 channels (variant dependent), two analog comparators, two capture/compare/PWM (ECCP) modules, an MSSP (SPI/I2C) port, an enhanced USART, a 4-timer on hardware up to 16-bit TimerCount, nanoWatt power management, fail-safe clock switching between primary and internal 31 kHz-8 MHz RC oscillator, watchdog timer with dedicated RC oscillator, and in-circuit serial programming (ICSP) via two pins.
The LF prefix denotes the wide-voltage operating range of 2.0 V to 5.5 V, allowing the device to be powered directly from a single-cell Li-ion, two AA cells, or a regulated 3.3 V or 5 V rail. Architecture is Harvard with separate program and data buses, 16-bit instructions, an 8 x 8 single-cycle hardware multiplier, and an interrupt controller with hardware context save/restore. The exposed pad on the 28-QFN (ML) package provides a low thermal resistance path for higher-frequency or higher-I/O-load designs.
Typical applications include industrial sensor interfaces, low-power remote sensor nodes, USB-less HID peripherals, motor control signal conditioning, small appliances, smart metering, battery-backed instrumentation, and portable medical accessories. LF-series devices also suit automotive body and chassis sub-systems running at nominal 5 V or 3.3 V where AEC-Q100 is not required.
When designing with this device, use MPLAB X IDE with the XC8 compiler and a PICkit 5 or ICD 5 for programming/debug. Place a 100 nF ceramic VML bypass capacitor as close as possible to each VDD/VSS pin pair and tie the exposed pad (EP) to the ground plane for thermal relief.
This page synthesizes distributor pricing, drop-in alternatives, parametric comparisons, and practical design notes that go beyond the manufacturer datasheet to support sourcing, second-source qualification, and lifecycle decisions.
Drop-in alternatives for PIC18LF2520-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 PIC18LF2520-I/ML (same form factor and footprint) — differing in Package, Timers, ADC, MSL Level, Communication.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF2520T-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF2420T-I/ML
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18LF2420-I/ML
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF2510-I/ML
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →PIC18F2520-I/ML
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC18LF24K40-I/ML
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.65 / Unit
View Datasheet →PIC18LF2520-I/ML Maximum Ratings & Electrical Characteristics
| Core | PIC18F (8-bit RISC) |
| CPU Architecture | Harvard, 16-bit instructions, 77 opcodes |
| Clock Speed | 40 MHz (10 MIPS) |
| Program Memory | 32 KB Flash (16K x 16) |
| Data RAM | 1.5 KB (1536 bytes) |
| Data EEPROM | 256 bytes |
| Supply Voltage (LF) | 2.0 V to 5.5 V |
| I/O Pins | 25 |
| ADC | 10-bit, up to 10 channels |
| Analog Comparators | 2 |
| ECCP / PWM Modules | 2 |
| MSSP (SPI / I2C) | 1 |
| Enhanced USART | 1 |
| Timers | 4 (1x 8-bit, 3x 16-bit) |
| Internal Oscillator | 31 kHz to 8 MHz, PLL up to 40 MHz |
| Watchdog Timer | Yes, with dedicated RC oscillator |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 28-QFN (6x6 mm) with exposed pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC18LF2520-I/ML Pin Configuration
| Pin 1 | MCLR/RE3 — Master Clear (Reset) input or digital input RE3 |
| Pin 2 | RA0/AN0 — Digital I/O RA0 or analog input AN0 |
| Pin 3 | RA1/AN1 — Digital I/O RA1 or analog input AN1 |
| Pin 4 | RA2/AN2/VREF- — Digital I/O RA2, analog AN2, or ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — Digital I/O RA3, analog AN3, or ADC VREF+ |
| Pin 6 | RA4/T0CKI — Digital I/O RA4 or Timer0 clock input |
| Pin 7 | RA5/AN4/SS — Digital I/O RA5, analog AN4, or SPI slave select |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKI/RA7 — Crystal oscillator input or digital I/O RA7 |
| Pin 10 | OSC2/CLKO/RA6 — Crystal oscillator output or digital I/O RA6 |
| Pin 11 | RC0/T1OSO/T13CKI — Digital I/O RC0, Timer1 oscillator output, or Timer1/Timer3 clock input |
| Pin 12 | RC1/T1OSI/CCP2 — Digital I/O RC1, Timer1 oscillator input, or CCP2 output |
| Pin 13 | RC2/CCP1 — Digital I/O RC2 or CCP1 PWM/capture/compare output |
| Pin 14 | RC3/SCK/SCL — Digital I/O RC3, SPI clock, or I2C clock |
| Pin 15 | RC4/SDI/SDA — Digital I/O RC4, SPI data in, or I2C data |
| Pin 16 | RC5/SDO — Digital I/O RC5 or SPI data out |
| Pin 17 | RC6/TX/CK — Digital I/O RC6, EUSART async TX, or sync clock |
| Pin 18 | RC7/RX/DT — Digital I/O RC7, EUSART async RX, or sync data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage |
| Pin 21 | RB0/INT0 — Digital I/O RB0 or external interrupt 0 |
| Pin 22 | RB1/INT1 — Digital I/O RB1 or external interrupt 1 |
| Pin 23 | RB2/INT2 — Digital I/O RB2 or external interrupt 2 |
| Pin 24 | RB3/CCP2 — Digital I/O RB3 or CCP2 alt output |
| Pin 25 | RB4 — Digital I/O RB4 |
| Pin 26 | RB5 — Digital I/O RB5 |
| Pin 27 | RB6/PGC — Digital I/O RB6 or ICSP clock |
| Pin 28 | RB7/PGD — Digital I/O RB7 or ICSP data |
| Pin 29 | EP — Exposed thermal pad - tie to ground |
Typical Applications
PIC18LF2520-I/ML is suitable for 8 applications: Industrial Sensor Interface, Battery-Powered Remote Sensor Node, Small Appliance Control, USB-less HID Peripheral, Smart Metering Sub-System, Portable Medical Accessory, Motor Control Signal Conditioning, Automotive Body/Chassis Sub-System.
Industrial Sensor Interface
The PIC18LF2520-I/ML is well-suited to industrial sensor interface boards because its 10-bit ADC with up to 10 channels handles multiple analog sensors simultaneously, while the 32 KB Flash accommodates protocol stacks for Modbus RTU over the enhanced USART. The 25 I/O pins provide ample headroom for digital inputs, status LEDs, and relay drivers. At 40 MHz, the 10 MIPS core handles encoder quadrature decoding and signal processing in real time. The wide 2.0 V to 5.5 V supply allows the board to be powered from a regulated 24 V industrial bus through an LDO. The 28-QFN package fits compact DIN-rail mounted PCBs where board area is at a premium.
Recommended
Battery-Powered Remote Sensor Node
The PIC18LF2520-I/ML operates down to 2.0 V, allowing it to run from two nearly-depleted AA cells before brown-out, maximizing usable battery capacity. nanoWatt sleep modes drop quiescent current to under 100 nA with RAM retention, enabling years of life on a single battery pack for periodic sensor reading and RF transmit cycles. The internal 31 kHz to 8 MHz RC oscillator eliminates the external crystal for cost and BOM reduction. The 1.5 KB RAM is sufficient for sensor buffering and a small wireless protocol stack. The 28-QFN exposed pad provides solid thermal dissipation in outdoor enclosures with limited convection cooling.
Recommended
Small Appliance Control
The PIC18LF2520-I/ML is appropriate for small appliance controllers such as coffee makers, blenders, and washing machine sub-modules where the 2 ECCP/PWM modules drive TRIAC or IGBT power switches for motor speed and heater regulation. The 10-bit ADC reads NTC thermistors and pressure sensors with sufficient resolution for closed-loop control. Enhanced USART and MSSP connect to a UI display board or to a Bluetooth/WiFi companion module for smart-home integration. The 32 KB Flash is sufficient for menu logic, safety state machines, and diagnostic firmware. Industrial -40 C to +85 C rating covers kitchen and laundry operating environments.
Recommended
USB-less HID Peripheral
The PIC18LF2520-I/ML works as the controller for HID peripherals such as custom keyboards, panel controllers, and industrial keypads that communicate via traditional UART or I2C. The MSSP port handles I2C-based display modules and capacitive touch controllers while the enhanced USART interfaces with a host processor. The 10-bit ADC is sufficient for joystick or slider sensing. The 25 I/O pins support large key matrices through scanning or diode multiplexing. The 32 KB Flash accommodates USB HID report descriptors and keymap translation tables where USB is implemented via a companion TUSB chip.
Recommended
Smart Metering Sub-System
The PIC18LF2520-I/ML serves as the metering logic controller in smart electricity, gas, or water meters, where the 10-bit ADC samples current shunts or Hall-effect sensors at 40 MHz with hardware-accelerated math via the 8x8 single-cycle multiplier. The 32 KB Flash accommodates DLMS/COSEM protocol stacks or proprietary AMI protocols, while 1.5 KB RAM buffers metering frames between transmit cycles. The fail-safe clock monitor and watchdog timer with dedicated RC oscillator meet utility-meter reliability requirements. The 256-byte EEPROM stores calibration constants and tamper counters across decades of operation without external storage.
Recommended
Portable Medical Accessory
The PIC18LF2520-I/ML is appropriate for portable medical accessories such as pulse-oximeter dongles, spirometer probes, and pill-dispenser controllers where low-voltage operation and EMC-clean digital I/O are required. The 10-bit ADC samples photodiode or thermistor signals; the 32 KB Flash runs FDA-relevant firmware with calibration constants stored in the on-chip 256-byte EEPROM. The wide 2.0 V to 5.5 V supply supports both coin-cell and Li-ion battery chemistries. Industrial -40 C to +85 C rating covers home and clinic environments. The 28-QFN package is small enough for wearable form factors.
Recommended
Motor Control Signal Conditioning
The PIC18LF2520-I/ML works as the signal-conditioning and supervisory controller in brushed DC and stepper motor systems where it does not directly drive the H-bridge but provides safety logic, encoder feedback, and commutation sequencing. The 2 ECCP/PWM modules generate timing waveforms that gate external MOSFET drivers, while the 10-bit ADC reads back-EMF, current shunt, and Hall-effect signals. The wide voltage range allows direct connection to 24 V industrial motor buses after an external regulator. The 32 KB Flash accommodates trapezoidal commutation tables and PID tuning firmware for closed-loop velocity control.
Recommended
Automotive Body/Chassis Sub-System
The PIC18LF2520-I/ML serves automotive body electronics such as seat controllers, mirror modules, interior lighting, and HVAC sub-modules running on the nominal 12 V vehicle bus after a 5 V regulator. The 10-bit ADC reads potentiometers and temperature sensors, the MSSP drives I2C-based LED controllers, and the enhanced USART interfaces with a CAN gateway via an MCP2510. The wide -40 C to +85 C industrial range covers cabin and engine-bay-adjacent environments. AEC-Q100 is not required for non-safety body electronics, making the standard LF2520 a cost-effective solution.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF2520-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF2520T-I/ML | PIC18LF2420T-I/ML | PIC18LF2420-I/ML | PIC18LF2510-I/ML | PIC18F2520-I/ML | PIC18LF24K40-I/ML |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-QFN (6x6) | 28-QFN (6x6) - same | 28-QFN (6x6) - same | 28-QFN (6x6) - same | 28-QFN (6x6) - same | 28-QFN (6x6) - same | 28-QFN (6x6) - same |
| Program Memory (Flash) | 32 KB | 32 KB | 16 KB | 16 KB | 32 KB | 32 KB | 16 KB |
| Data RAM | 1.5 KB | 1.5 KB | 768 B | 768 B | 1.5 KB | 1.5 KB | 1 KB |
| Supply Voltage | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 2.0 V - 5.5 V | 4.2 V - 5.5 V | 1.8 V - 3.6 V |
| Clock Speed | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 64 MHz / 16 MIPS |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 10-bit | 8-bit | 10-bit | 10-bit |
| I/O Pins | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Key Differentiators
- Largest program memory in the 28-pin PIC18F2520 sub-family (vs PIC18LF2420-I/ML)
- Wide-voltage LF core for battery and 3.3 V designs (vs PIC18F2520-I/ML)
- 10-bit ADC with up to 10 channels versus 8-bit on older 2510 (vs PIC18LF2510-I/ML)
- Mature PIC18 architecture with extensive toolchain support (vs PIC18LF24K40-I/ML)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD/VSS pin pair. For a 28-QFN with single VDD/VSS pair, use one 100 nF X7R plus a 10 uF bulk capacitor on the supply rail. The exposed pad (EP) must be soldered to the ground plane for thermal relief and to provide the lowest-impedance return path. The PIC18LF2520-I/ML accepts 2.0 V to 5.5 V; verify that downstream analog peripherals share a clean analog supply when VDD is below 3.0 V.
Route the ICSP lines (RB6/PGC and RB7/PGD) with short, direct traces and avoid routing high-speed signals adjacent to minimize capacitive coupling during in-circuit programming. Place the ICSP connector or test pads on the board edge for probe access. The internal oscillator eliminates the need for an external crystal but if one is used, keep the crystal traces short and symmetric, surrounded by a grounded guard ring. For EMI-sensitive designs, place a ferrite bead on the supply feed near the MCU.
Do not confuse the LF (2.0 V-5.5 V) variant with the standard F (4.2 V-5.5 V) variant when designing battery-powered systems - the F variant will brown out below 4.2 V. Always configure the MCLR pin as MCLR (reset) with the appropriate 10 kohm pull-up unless you intentionally need it as RE3 input. Watchdog timer should be enabled in production firmware to recover from unexpected code lock-ups; the dedicated RC oscillator means WDT operates even if the main clock fails.
Estimated: at maximum clock rate (40 MHz) and full peripheral activity, the PIC18LF2520-I/ML draws about 30 mA from 5 V (150 mW); at 3.3 V it draws approximately 14 mA (46 mW). With the 28-QFN (6x6) package and exposed pad soldered to a 1 sq inch copper pour, theta_JA is approximately 40 C/W, yielding a junction rise of about 6 C above ambient at 5 V full activity. The exposed pad is mandatory for thermal dissipation and must not be left floating.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade (-40 C to +85 C), not AEC-Q100 qualified - AEC-Q100 variants are not offered in the standard PIC18LF2520 part number. Lead-free reflow profile per JEDEC J-STD-020.
