PIC18LF6520T-I/PT - 40MHz 8-bit MCU 32KB Flash 64-TQFP | Microchip
MPN: PIC18LF6520T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.2 | $8.20 |
| 10 | $7.38 | $73.80 |
| 100 | $6.55 | $655.00 |
| 500 | $5.9 | $2,950.00 |
| 1,000 | $5.25 | $5,250.00 |
PIC18LF6520T-I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip processor with an 8-bit data path, on-board Flash program memory, RAM, and a rich set of peripherals (timers, ADC, UART, I2C, SPI, PWM). PIC18F/LF-series MCUs sit at the upper end of Microchip's 8-bit portfolio (PIC16 -> PIC18 -> PIC32), delivering 10 MIPS performance with Harvard RISC architecture and 16-bit instructions. PIC18LF variants support a wide 2.0V-5.5V operating range for low-voltage and battery-powered designs.
Key features of the PIC18LF6520T-I/PT include: 40 MHz maximum clock (10 MIPS), 32 KB self-programmable Flash, 2 KB RAM, 1 KB data EEPROM, 54 I/O pins with individual direction control, multiple serial interfaces (2x USART, MSSP for SPI/I2C), two 8-bit and three 16-bit timers, 10-bit ADC up to 15 channels, two analog comparators, dual capture/compare/PWM modules, and a hardware 8x8 multiplier. The wide 2.0V-5.5V operating range enables single-rail designs from two AA cells to 5V industrial buses.
Architecturally, the device uses Microchip's enhanced Harvard architecture with separate program and data buses, 32-level deep hardware stack, and a priority-interrupt controller supporting both legacy PIC16/PIC17 software migration and native PIC18 C development under MPLAB X with XC8. The 'LF' suffix designates the wide-voltage (2.0V-5.5V) variant, while 'T' in the MPN denotes tape-and-reel packaging and 'I' denotes industrial temperature grade.
Typical applications include industrial control panels, HVAC controllers, motor control driver boards, low-power sensor hubs, USB-to-UART bridges, and home appliances. Designers benefit from decades of PIC18 code compatibility and broad third-party library support. When designing with this part, verify that your VDD rail stays within 2.0V-5.5V and use the internal 8 MHz RC oscillator or an external crystal up to 40 MHz depending on MIPS requirements. The 64-TQFP package provides ample I/O for parallel bus or matrix keypad interfaces. This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the bare manufacturer datasheet.
Drop-in alternatives for PIC18LF6520T-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 PIC18LF6520T-I/PT (same form factor and footprint) — differing in Core Architecture, Package, Program Memory (Flash), Timers, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF6520-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF6520T-I/PTG
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF6527T-I/PT
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →PIC18LF6525T-I/PT
✅ Drop-In✓ In Stock
$5.95 / Unit
View Datasheet →PIC18LF8627T-I/PT
✅ Drop-In✓ In Stock
$7.1 / Unit
View Datasheet →PIC18F67J10-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF6520T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit Harvard RISC) |
| Maximum CPU Clock | 40 MHz (10 MIPS) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data SRAM | 2 KB |
| Data EEPROM | 1 KB |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 54 |
| Package | TQFP-64 (10 x 10 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C (Industrial) |
| ADC | 10-bit, up to 15 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Capture/Compare/PWM | 2 CCP modules |
| Serial Interfaces | 2 x USART (AUSART), MSSP (SPI / I2C) |
| Analog Comparators | 2 |
| Hardware Multiplier | 8 x 8 single-cycle |
| Instruction Set | PIC18 (16-bit opcodes) |
| RoHS Status | Compliant (Pb-free) |
PIC18LF6520T-I/PT Pin Configuration
| Pin 1 | OSC2/CLKO/RA6 — Oscillator output / general I/O |
| Pin 2 | OSC1/CLKI/RA7 — Oscillator input / general I/O |
| Pin 3 | MCLR — Master Clear (reset) input |
| Pin 4 | RA0/AN0 — Digital I/O / analog input 0 |
| Pin 5 | RA1/AN1 — Digital I/O / analog input 1 |
| Pin 6 | RA2/AN2/VREF- — Digital I/O / analog input 2 / VREF- |
| Pin 7 | RA3/AN3/VREF+ — Digital I/O / analog input 3 / VREF+ |
| Pin 8 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 9 | RA5/AN4/SS — Digital I/O / analog input 4 / SPI slave select |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage (2.0V-5.5V) |
| Pin 12 | RB0/INT0 — Digital I/O / external interrupt 0 |
| Pin 13 | RB1/INT1 — Digital I/O / external interrupt 1 |
| Pin 14 | RB2/INT2 — Digital I/O / external interrupt 2 |
| Pin 15 | RB3/INT3/CCP2 — Digital I/O / external interrupt 3 / CCP2 |
| Pin 16 | RB4/INT4 — Digital I/O / external interrupt 4 |
| Pin 17 | RB5/INT5 — Digital I/O / external interrupt 5 |
| Pin 18 | RB6/PGC — Digital I/O / ICSP clock |
| Pin 19 | RB7/PGD — Digital I/O / ICSP data |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply voltage (2.0V-5.5V) |
| Pin 22 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock input |
| Pin 23 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| Pin 24 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| Pin 25 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Pin 26 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Pin 27 | RC5/SDO — Digital I/O / SPI data out |
| Pin 28 | RC6/TX/CK — Digital I/O / USART TX / clock |
| Pin 29 | RC7/RX/DT — Digital I/O / USART RX / data |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply voltage (2.0V-5.5V) |
| Pin 32 | RD0/PSP0 — Digital I/O / parallel slave port 0 |
| Pin 33 | RD1/PSP1 — Digital I/O / parallel slave port 1 |
| Pin 34 | RD2/PSP2 — Digital I/O / parallel slave port 2 |
| Pin 35 | RD3/PSP3 — Digital I/O / parallel slave port 3 |
| Pin 36 | RD4/PSP4 — Digital I/O / parallel slave port 4 |
| Pin 37 | RD5/PSP5 — Digital I/O / parallel slave port 5 |
| Pin 38 | RD6/PSP6/TX2 — Digital I/O / PSP6 / USART2 TX |
| Pin 39 | RD7/PSP7/RX2 — Digital I/O / PSP7 / USART2 RX |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply voltage (2.0V-5.5V) |
| Pin 42 | RE0/RD — Digital I/O / parallel port read control |
| Pin 43 | RE1/WR — Digital I/O / parallel port write control |
| Pin 44 | RE2/CS — Digital I/O / parallel port chip select |
| Pin 45 | VSS — Ground reference |
| Pin 46 | VDD — Positive supply voltage (2.0V-5.5V) |
| Pin 47 | RF0/AN5 — Digital I/O / analog input 5 |
| Pin 48 | RF1/AN6/C2OUT — Digital I/O / analog input 6 / comparator 2 output |
| Pin 49 | RF2/AN7/C1OUT — Digital I/O / analog input 7 / comparator 1 output |
| Pin 50 | RF3/AN8 — Digital I/O / analog input 8 |
| Pin 51 | RF4/AN9 — Digital I/O / analog input 9 |
| Pin 52 | RF5/AN10/CVREF — Digital I/O / analog input 10 / comparator VREF |
| Pin 53 | RF6/AN11 — Digital I/O / analog input 11 |
| Pin 54 | RF7/AN12 — Digital I/O / analog input 12 |
| Pin 55 | RG0 — Digital I/O (PORTG) |
| Pin 56 | RG1 — Digital I/O (PORTG) |
| Pin 57 | RG2 — Digital I/O (PORTG) |
| Pin 58 | RG3 — Digital I/O (PORTG) |
| Pin 59 | RG4 — Digital I/O (PORTG) |
| Pin 60 | AVSS — Analog ground reference |
| Pin 61 | AVDD — Analog positive supply |
| Pin 62 | RH0/AN13 — Digital I/O / analog input 13 |
| Pin 63 | RH1/AN14 — Digital I/O / analog input 14 |
| Pin 64 | RH2 — Digital I/O (PORTH) |
Typical Applications
PIC18LF6520T-I/PT is suitable for 6 applications: Industrial Control Panels, HVAC and Climate Controllers, Low-Power Sensor Hubs, Motor Control Driver Boards, Home Appliance Control Boards, USB-to-UART Bridge and Serial Protocol Converter.
Industrial Control Panels
The PIC18LF6520T-I/PT fits industrial control panels because of its 54 digital I/O pins (sufficient for 4x4 matrix keypads, 7-segment or character LCD bus, and 16-24 optocoupled output relays), 2.0V-5.5V wide VDD tolerance that survives brown-outs on 24 V industrial rails, and the 40 MHz 10 MIPS throughput that runs Modbus RTU or PROFIBUS-style protocols in real time. It also provides a 10-bit ADC with 15 channels for analog transducer inputs (4-20 mA, 0-10 V, RTD/thermocouple amplifiers) plus two analog comparators for over-current/over-voltage detection. The 32 KB Flash holds full state machines, the 2 KB SRAM supports Modbus buffers and a 1 KB EEPROM stores calibration setpoints without battery backup.
Recommended
HVAC and Climate Controllers
The PIC18LF6520T-I/PT is well-suited to HVAC and climate-control thermostats thanks to its 10-bit ADC for multiple temperature/humidity sensor inputs, the dual CCP/PWM modules that drive fan triacs, damper servos and compressor relays, and the wide 2.0V-5.5V supply that survives transient drops from relay coils. The 32 KB Flash holds PID control loops, scheduling tables, and a display UI menu, while the 1 KB EEPROM retains user-set temperature curves across power cycles. The 54 I/O interface directly to character LCDs, keypads, and a UART-connected Wi-Fi or Sub-GHz module. Compared with discrete 8051 solutions, this part gives a single-chip BOM with on-board EEPROM and analog comparators.
Recommended
Low-Power Sensor Hubs
The PIC18LF6520T-I/PT is a strong fit for low-power sensor hubs that aggregate analog/digital sensor data and forward it via UART, SPI or I2C to a host or radio. The 'LF' (2.0V-5.5V) wide-voltage range allows direct operation from a 3.3 V LDO, and the 2 KB SRAM plus 32 KB Flash comfortably hold buffering, averaging, and protocol stacks. Two USARTs plus MSSP (SPI/I2C) permit simultaneous connection to a sensor front-end and a wireless module. The 10-bit ADC with up to 15 channels handles multi-sensor inputs (temperature, pressure, light, gas). The 1 KB EEPROM stores calibration constants and device IDs.
Recommended
Motor Control Driver Boards
The PIC18LF6520T-I/PT drives brushed-DC, stepper and small BLDC motors via its dual CCP/PWM modules and 16-bit timers with hardware PWM. The 10 MIPS throughput closes 10 kHz+ current-control loops, while the wide 2.0V-5.5V supply accommodates 3.3 V logic-level gate drivers and 5 V H-bridges equally. The 54 I/O interface to quadrature encoders, Hall sensors, end-stop switches and fault inputs. On-chip analog comparators trigger hardware over-current shutdown, and the 32 KB Flash stores velocity profiles and PI controller tuning. The TQFP-64 package provides ample thermal headroom for the MCU itself even at full MIPS.
Recommended
Home Appliance Control Boards
The PIC18LF6520T-I/PT powers white-goods and small-appliance main boards where 54 I/O, 32 KB Flash and 1 KB EEPROM cover UI panel, sensor array, triac/relay drivers and a real-time clock. The wide VDD range supports both 3.3 V and 5 V designs, simplifying BOM reuse across washing-machine, dishwasher and oven sub-models. The USART enables Wi-Fi/Bluetooth module attachment for smart-appliance variants, while the 10-bit ADC monitors NTC thermistors, water-level probes and door interlocks. The PIC18 architecture's decades-long silicon maturity reduces appliance-class qualification risk.
Recommended
USB-to-UART Bridge and Serial Protocol Converter
The PIC18LF6520T-I/PT, paired with a USB- serial bridge or used with its MSSP and USART peripherals, is a flexible multi-protocol converter (UART to SPI/I2C, RS-232 to RS-485, etc.). The two USARTs allow simultaneous protocol bridging, while the MSSP handles I2C/SPI slave or master roles. The 2 KB SRAM buffers sustained packet traffic, and 32 KB Flash holds Modbus, DMX-512, or custom industrial protocols. The wide 2.0V-5.5V supply interfaces directly with both 3.3 V and 5 V legacy equipment. Industrial temperature grade (-40C to +85C) supports factory-floor deployments.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF6520T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF6520-I/PT | PIC18LF6520T-I/PTG | PIC18LF6527T-I/PT | PIC18LF6525T-I/PT | PIC18LF8627T-I/PT | PIC18F67J10-I/PT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-64 (10x10 mm) | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same |
| Core / Architecture | PIC18 8-bit 10 MIPS | PIC18 8-bit 10 MIPS | PIC18 8-bit 10 MIPS | PIC18 8-bit 10 MIPS | PIC18 8-bit 10 MIPS | PIC18 8-bit 10 MIPS | PIC18 8-bit 10 MIPS |
| Max CPU Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Flash Program Memory | 32 KB | 32 KB | 32 KB | 96 KB | 48 KB | 96 KB | 128 KB |
| Data SRAM | 2 KB | 2 KB | 2 KB | 4 KB | 2 KB | 4 KB | 3.8 KB |
| Data EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 0 (none - flash-based emulation) |
| VDD Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 3.6 V |
| I/O Pins | 54 | 54 | 54 | 54 | 54 | 70 | 50 |
| Operating Temperature | -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 | -40 C to +85 C |
Key Differentiators
- Wide 2.0V-5.5V VDD range vs standard PIC18F6520 4.2V-5.5V (vs PIC18F6520-I/PT)
- Larger Flash and RAM vs the base 32 KB/2 KB (vs PIC18LF6527T-I/PT)
- Halogen-free packaging option for IEC 61249-2-21 compliance (vs PIC18LF6520T-I/PTG)
- Mass-production tape-and-reel vs prototype tray packaging (vs PIC18LF6520-I/PT)
Design Notes
Decouple every VDD/VSS pair on the PIC18LF6520T-I/PT with a 100 nF ceramic capacitor placed within 5 mm of the pin pair. The device has four VDD pins (11, 21, 31, 41, 46) and five VSS pins (10, 20, 30, 40, 45) plus separate analog AVDD/AVSS pins (61/60) that should each have their own 100 nF cap. A bulk 10 uF tantalum or aluminum-polymer capacitor near the IC handles the in-rush current of the internal Flash programming pump. The wide 2.0V-5.5V supply permits direct battery or USB operation, but a ferrite bead plus decoupling cap is recommended when the rail is shared with an inductive relay or motor.
Never leave MCLR floating on the PIC18LF6520T-I/PT. Tie MCLR (pin 3) to VDD through a 10 kohm pull-up resistor with a 100 nF cap to ground for noise filtering - omitting the cap or the pull-up is the most common reason a PIC18 will randomly enter reset or fail to start. RB6 (PGC) and RB7 (PGD) must be isolated from external pull-ups stronger than 10 kohm so that the ICSP programmer can drive them during in-circuit programming/debug. The internal 8 MHz RC oscillator drifts over voltage and temperature, so use an external crystal when serial baud rates must remain within 2% over industrial temperature.
Route the 40 MHz oscillator traces (OSC1/OSC2, pins 16 and 15 wait - OSC1/OSC2 are RA6/RA7 at pins 1/2) symmetrically with ground guard traces to avoid injection of harmonics into adjacent analog AN0-AN12 inputs. Keep analog traces away from the digital I/O PORTD parallel-slave-port bus and the PWM CCP outputs. Place the analog VREF+/VREF- decoupling (10 uF + 100 nF) at the RA3/RA2 pins (7/6) to keep ADC readings stable. The exposed thermal pad is not present on the TQFP-64, so use a copper pour connected to VSS beneath the IC for thermal spreading if the device is expected to drive many outputs simultaneously.
When laying out the PIC18LF6520T-I/PT, group ports logically: PORTA for analog, PORTB for ICSP and key inputs, PORTC for serial/SPI, PORTD for parallel slave port or character LCD data, PORTE for PSP control signals, PORTF for additional analog, PORTG for general digital, and PORTH for the remaining analog inputs. This partitioning makes firmware portable to PIC18LF8520/8620/8720 derivatives in the same family. Note that RG0-RG4 (pins 55-59) and RH0-RH2 (pins 62-64) are added on the higher-pin-count variants; leaving these pins as outputs on the 64-pin part is safe but reading them yields indeterminate data.
Compliance Information
RoHS compliant per Microchip product page (Pb-free PT package suffix). The PTG variant adds halogen-free compliance. PIC18LF family is not AEC-Q100 qualified; for automotive, use PIC18F-series Q-qualified parts.
