PIC18F6520-I/PT - 8-Bit 40MHz 32KB Flash MCU 64-TQFP | Microchip
MPN: PIC18F6520-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.53 | $9.53 |
| 10 | $8.58 | $85.80 |
| 100 | $7.62 | $762.00 |
| 500 | $6.85 | $3,425.00 |
| 1,000 | $6.1 | $6,100.00 |
PIC18F6520-I/PT Overview
An 8-bit microcontroller (MCU) is a compact programmable processor built around a CPU with 8-bit wide data paths, on-chip memory (Flash for code, SRAM for data, EEPROM for non-volatile storage), and integrated peripherals such as timers, ADC, communication interfaces (UART, SPI, I2C), and general-purpose I/O. Microcontrollers sit at the foundation of embedded systems, hierarchically classified as embedded IC -> MCU -> 8-bit MCU -> PIC18F family -> PIC18F6520. The PIC18F6520 extends the popular PIC18F452 with more RAM, additional I/O, a second serial port, and additional timers and CCP modules while remaining upward-software-compatible with PIC16 and PIC17 devices.
Key features include 52 digital I/O pins (54 total I/O per datasheet summary), a 10-bit ADC with up to 16 channels, two enhanced USART modules, MSSP (SPI/I2C), three timers, two Capture/Compare/PWM modules, two comparators, and a parallel slave port. The PIC18F6520 uses an enhanced Harvard RISC architecture with hardware multiplier and 16-bit instructions, achieving 10 MIPS throughput at 40 MHz. In-circuit debugging and ICSP (In-Circuit Serial Programming) are supported via MPLAB ICD and the ICSP interface.
Typical applications include industrial control systems, automotive body and HVAC modules, consumer appliances, home automation, USB-to-UART bridges, sensor hubs, display controllers, and low-end graphical user interfaces. The wide peripheral set, large I/O count, and generous memory make it a strong fit for human-machine interface (HMI) controllers and multi-protocol gateway designs.
Design considerations include decoupling on AVDD/AVSS for ADC accuracy, brown-out reset (BOR) configuration via configuration bits, and watchdog timer (WDT) enable for safety-critical applications. Migrating from PIC18F452 code is straightforward via MPLAB XC8.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC18F6520-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 PIC18F6520-I/PT (same form factor and footprint) — differing in Package, Core Architecture, Timers, Program Memory Size, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F6620-I/PT
✅ Drop-In✓ In Stock
$5.55 / Unit
View Datasheet →PIC18F6720-I/PT
✅ Drop-In✓ In Stock
$21.1 / Unit
View Datasheet →PIC18F6520-E/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F8520-I/PT
✅ Drop-In✓ In Stock
$5.1586 / Unit
View Datasheet →PIC18F8720-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F458-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F4685-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.2 / Unit
View Datasheet →PIC18F6520-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC18 enhanced Harvard RISC |
| Family | PIC18F6x2x |
| Maximum Clock Speed | 40 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data RAM | 2 KB (2048 bytes) |
| EEPROM | 1 KB (1024 bytes) |
| I/O Pins | 52 (54 per datasheet summary) |
| ADC | 10-bit, up to 16 channels |
| Supply Voltage (Vdd) | 4.2 V to 5.5 V |
| Operating Temperature | -40C to +85C (Industrial, "I" grade) |
| Package | 64-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Communication Interfaces | 2x USART (EUSART), MSSP (SPI/I2C) |
| Timers | 3 (Timer0/1/2) |
| Capture/Compare/PWM | 2 CCP modules |
| Comparators | 2 |
| Parallel Slave Port | Yes |
| ICSP / In-Circuit Debug | Yes |
| RoHS Status | Compliant |
| MSL Level | 3 |
PIC18F6520-I/PT Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 2 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 3 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / VREF- |
| Pin 4 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / VREF+ |
| Pin 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 6 | RA5/AN4 — PORTA bit 5 / Analog input 4 |
| Pin 7 | RA6/OSC2 — PORTA bit 6 / Oscillator output |
| Pin 8 | RA7/OSC1 — PORTA bit 7 / Oscillator input |
| Pin 9 | RE0/RD/AN5 — PORTE bit 0 / Parallel slave port read |
| Pin 10 | RE1/WR/AN6 — PORTE bit 1 / Parallel slave port write |
| Pin 11 | Vss — Ground |
| Pin 12 | Vdd — Positive supply voltage |
| Pin 13 | RE2/CS/AN7 — PORTE bit 2 / PSP chip select / Analog input 7 |
| Pin 14 | AVdd — Analog positive supply voltage |
| Pin 15 | AVss — Analog ground |
| Pin 16 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| Pin 17 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Pin 18 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| Pin 19 | RB3/INT3/CCP2A — PORTB bit 3 / External interrupt 3 / CCP2 |
| Pin 20 | RB4 — PORTB bit 4 |
| Pin 21 | RB5 — PORTB bit 5 |
| Pin 22 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 23 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 24 | RC0/T1OSO/T13CKI — PORTC bit 0 / Timer1 oscillator output |
| Pin 25 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input |
| Pin 26 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 27 | RC3/SCK/SCL — PORTC bit 3 / MSSP SPI clock / I2C clock |
| Pin 28 | RC4/SDI/SDA — PORTC bit 4 / MSSP SPI data in / I2C data |
| Pin 29 | RC5/SDO — PORTC bit 5 / MSSP SPI data out |
| Pin 30 | RC6/TX1/CK1 — PORTC bit 6 / EUSART1 transmit |
| Pin 31 | RC7/RX1/DT1 — PORTC bit 7 / EUSART1 receive |
| Pin 32 | RD0/PSP0 — PORTD bit 0 / Parallel slave port data 0 |
| Pin 33 | RD1/PSP1 — PORTD bit 1 / Parallel slave port data 1 |
| Pin 34 | RD2/PSP2 — PORTD bit 2 / Parallel slave port data 2 |
| Pin 35 | RD3/PSP3 — PORTD bit 3 / Parallel slave port data 3 |
| Pin 36 | RD4/PSP4 — PORTD bit 4 / Parallel slave port data 4 |
| Pin 37 | RD5/PSP5 — PORTD bit 5 / Parallel slave port data 5 |
| Pin 38 | RD6/PSP6 — PORTD bit 6 / Parallel slave port data 6 |
| Pin 39 | RD7/PSP7 — PORTD bit 7 / Parallel slave port data 7 |
| Pin 40 | Vss — Ground |
| Pin 41 | Vdd — Positive supply voltage |
| Pin 42 | RF0/CVREF — PORTF bit 0 / Comparator voltage reference |
| Pin 43 | RF1/AN8 — PORTF bit 1 / Analog input 8 |
| Pin 44 | RF2/AN9 — PORTF bit 2 / Analog input 9 |
| Pin 45 | RF3/AN10 — PORTF bit 3 / Analog input 10 |
| Pin 46 | RF4/AN11 — PORTF bit 4 / Analog input 11 |
| Pin 47 | RF5/AN12/C2OUT — PORTF bit 5 / Analog input 12 / Comparator 2 output |
| Pin 48 | RF6/AN13/C1OUT — PORTF bit 6 / Analog input 13 / Comparator 1 output |
| Pin 49 | RF7/AN14 — PORTF bit 7 / Analog input 14 |
| Pin 50 | RG0/C3OUT — PORTG bit 0 / Comparator 3 output |
| Pin 51 | RG1/TX2/CK2 — PORTG bit 1 / EUSART2 transmit |
| Pin 52 | RG2/RX2/DT2 — PORTG bit 2 / EUSART2 receive |
| Pin 53 | RG3/CCP3 — PORTG bit 3 / CCP3 module |
| Pin 54 | RG4/AN15 — PORTG bit 4 / Analog input 15 |
| Pin 55 | RG5 — PORTG bit 5 |
| Pin 56 | RH0/A16 — PORTH bit 0 / External memory address 16 |
| Pin 57 | RH1/A17 — PORTH bit 1 / External memory address 17 |
| Pin 58 | RH2/A18 — PORTH bit 2 / External memory address 18 |
| Pin 59 | RH3/A19 — PORTH bit 3 / External memory address 19 |
| Pin 60 | MCLR/Vpp — Master clear / ICSP programming voltage |
| Pin 61 | Vss — Ground |
| Pin 62 | Vdd — Positive supply voltage |
| Pin 63 | RH4 — PORTH bit 4 |
| Pin 64 | RH5 — PORTH bit 5 |
Typical Applications
PIC18F6520-I/PT is suitable for 6 applications: Industrial Control PLC, Human-Machine Interface (HMI), Automotive Body & HVAC Modules, Consumer Appliance Control, Multi-Protocol Sensor Gateway, USB-to-UART Bridge Dongle.
Industrial Control PLC
The PIC18F6520-I/PT fits industrial PLC and process-control applications because it provides 52 digital I/O lines to drive relays, optocouplers, and discrete indicators, plus a 16-channel 10-bit ADC to read 4-20 mA or 0-10 V sensor signals. Its 40 MHz core delivers 10 MIPS, easily handling Modbus RTU slave stacks on either of the two EUSART ports, while 32 KB Flash supports small ladder-logic interpreters or PID control firmware. The industrial -40C to +85C temperature rating allows deployment in factory-floor cabinets without additional thermal hardening.
Recommended
Human-Machine Interface (HMI)
For HMI panels with character LCDs, keypads, and rotary encoders, the PIC18F6520-I/PT offers the right balance of I/O count, memory, and computational throughput. The 32 KB Flash accommodates menu trees and bitmap fonts, while the two EUSART modules interface with touch controllers and host PLCs simultaneously. The parallel slave port (PSP) enables high-throughput parallel updates to graphic LCDs without CPU overhead. Industrial temperature rating ensures reliable operation in control cabinet environments alongside other heat-generating electronics.
Recommended
Automotive Body & HVAC Modules
The PIC18F6520-I/PT is well-suited for non-safety automotive body controllers, HVAC panels, and instrument-cluster sub-modules. Its 52 I/O drive window lift switches, mirror controls, and LED backlights directly, while the two USART ports handle LIN bus communication and diagnostic interfaces. With proper external protection (TVS diodes, load dump protection), the MCU operates reliably across automotive temperature and electrical transients. For CAN-enabled variants, consider the PIC18F4685 family drop-in alternative with an integrated CAN module in the same 64-TQFP footprint.
Recommended
Consumer Appliance Control
In washing machines, dishwashers, ovens, and refrigerators, the PIC18F6520-I/PT drives user interfaces, triac-fired loads, and sensor readouts at a competitive cost point. The 16-channel ADC monitors temperature (NTC/PTC), water level, and motor current, while the two CCP modules generate PWM signals for variable-speed motor drives or heater PID loops. 32 KB Flash supports appliance-grade firmware with self-test diagnostics, fault logging, and capacitive-touch sensing libraries via the MSSP peripheral.
Recommended
Multi-Protocol Sensor Gateway
The PIC18F6520-I/PT acts as a low-cost sensor-to-cloud gateway aggregating data from SPI, I2C, and UART sensors and forwarding it to a host processor or modem. Two EUSART modules allow simultaneous connections to a sensor bus and a wireless module, while the MSSP handles SPI or I2C sensor arrays. 32 KB Flash accommodates protocol translation logic for Modbus, I2C sensor stacks, and proprietary fieldbus variants. The wide 4.2V to 5.5V supply simplifies integration with industrial 5V sensors and RS-485 transceivers.
Recommended
USB-to-UART Bridge Dongle
In legacy-to-USB bridges for firmware update or service diagnostics, the PIC18F6520-I/PT pairs with a USB-serial IC to provide buffering, command parsing, and protocol framing. The two EUSART ports enable dual-domain bridging (one to legacy RS-232/RS-485 equipment, one to the USB bridge IC), and the 2 KB RAM buffers incoming packets before forwarding. Industrial temperature rating ensures operation in field-service tools across climate ranges.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F6520-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F6620-I/PT | PIC18F6720-I/PT | PIC18F6520-E/PT | PIC18F8520-I/PT | PIC18F4685-I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-64 (10x10 mm) | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-64 (10x10 mm) - same | TQFP-80 - different | TQFP-64 (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Core | PIC18 8-bit, 40 MHz | PIC18 8-bit, 40 MHz | PIC18 8-bit, 40 MHz | PIC18 8-bit, 40 MHz | PIC18 8-bit, 40 MHz | PIC18 8-bit, 40 MHz |
| Flash | 32 KB | 64 KB | 128 KB | 32 KB | 32 KB | 96 KB |
| RAM | 2 KB | 4 KB | 3.8 KB | 2 KB | 2 KB | 3.8 KB |
| I/O Pins | 52 | 52 | 52 | 52 | 68 | 52 |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C |
| CAN Module | No | No | No | No | No | Yes (CAN 2.0B) |
Key Differentiators
- Lowest-cost 64-TQFP option in the PIC18F6x20 family (vs PIC18F6620-I/PT)
- Industrial temperature range at lower cost vs extended grade (vs PIC18F6520-E/PT)
- Integrated parallel slave port for high-speed LCD/peripheral interfacing (vs PIC18F458-I/PT)
Design Notes
Decouple both Vdd/Vss pin pairs (pins 12/11, 41/40, 62/61) with 100 nF ceramic capacitors placed within 5 mm of the pins. AVdd (pin 14) and AVss (pin 15) require a separate 10 uF bulk plus 100 nF ceramic to achieve datasheet ADC SNR; sharing AVss with digital Vss creates ground bounce that corrupts ADC readings. Add a 10 uF tantalum or ceramic bulk capacitor near the ICSP/MCLR pin (60) to suppress programming-voltage transients during in-circuit programming.
Route the crystal traces to OSC1/OSC2 (pins 7/8) as short, symmetrical lengths surrounded by a ground guard ring to minimize EMI pickup. Place the 22 pF crystal load capacitors within 3 mm of the OSC pins. For high-speed designs using a 40 MHz oscillator, place a 100 ohm series resistor in each OSC trace to dampen over/undershoot. The ICSP/PGD/PGC pins (23/22) must be accessible without crossing other signal traces to support in-circuit debug.
Do not leave MCLR floating - tie it to Vdd through a 10 kohm resistor or drive it actively to avoid spurious resets. Configuration bits must be set explicitly: enable the watchdog timer (WDT) for safety-critical applications, configure BOR voltage for the expected Vdd range, and disable low-voltage programming if not used. The PIC18F6520 has a maximum Vdd of 5.5 V - exceeding this during hot-plug events or load-dump transients will permanently damage the part; add a TVS diode on the supply rail.
Compliance Information
RoHS and lead-free per Microchip product page; not AEC-Q100 qualified - select PIC18F46Jxx or PIC18F4685 family for automotive-grade variants. REACH compliance declared by Microchip.
