PIC18LF6525T-I/PT - 8-Bit 40MHz MCU, 48KB Flash, TQFP-64 | Microchip
MPN: PIC18LF6525T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.1 | $9.10 |
| 10 | $8.05 | $80.50 |
| 100 | $7.12 | $712.00 |
| 500 | $6.5 | $3,250.00 |
| 1,000 | $5.95 | $5,950.00 |
PIC18LF6525T-I/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), non-volatile storage (EEPROM), and a rich set of peripherals on one die. Within Microchip's taxonomy, the PIC18F family sits above the baseline PIC10/12/16 families in terms of performance and peripheral count - 8-bit MCU -> microcontroller -> embedded controller -> semiconductor. PIC18F parts add hardware multiply, larger linear addressing, and C-friendly architecture optimized for mixed C/assembly firmware development.
Key features of the PIC18LF6525 include 54 digital I/O lines, up to twelve 10-bit ADC channels, two analog comparators, two USART modules, one MSSP (I2C/SPI) peripheral, two Capture/Compare/PWM (CCP) modules plus one Enhanced CCP (ECCP), a 16-bit timer with three 8-bit timers, an RTCC, and a parallel slave port for external bus expansion. The on-chip 10-bit ADC can reach 100 ksps and is supported by up to twelve input channels, which is sufficient for sensor interfaces in industrial and instrumentation systems.
Architecturally, the PIC18LF6525 uses a Harvard-class 8-bit RISC core with a 16-bit instruction word, an 8-level hardware stack, and a 31-level software-managed stack for high-level language support. The 4.2 V to 5.5 V range quoted on distributor pages reflects the parametric ADC specification; the device itself supports a wider operating voltage range down to 2.0 V. Low-power nanoWatt technology features include multiple idle and sleep modes, an ultra-low-power wake-up timer, and software-controlled oscillator switching.
Typical applications for the PIC18LF6525T-I/PT include industrial automation controllers, building HVAC and access-control panels, instrumentation front-ends with LCD/keypad interfaces, automotive body and chassis subsystems (non-safety), and consumer appliances requiring moderate Flash headroom (48 KB) and significant I/O count (54 lines). The combination of an 8-bit core with strong peripherals makes it well-suited for legacy firmware migration onto a stable, long-life Microchip platform.
Designers should note that the LF variants add voltage-minimum operation down to 2.0 V, which is essential for battery-backed designs; when migrating between PIC18F6525 and PIC18LF6525 always confirm the brown-out reset voltage and the ADC reference selection. The parallel slave port allows direct connection to an external host CPU for use as a peripheral co-processor, and the large pin count (TQFP-64) provides ample I/O for keypad scanning and character LCD drives.
Drop-in alternatives for PIC18LF6525T-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 PIC18LF6525T-I/PT (same form factor and footprint) — differing in Package, Core Architecture, Program Memory (Flash), Timers, I/O Pins.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF6520T-I/PT
✅ Drop-In✓ In Stock
$5.25 / Unit
View Datasheet →PIC18F6627T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F6622T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF6722T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F8722T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18LF6525T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC18F RISC |
| Program Memory (Flash) | 48 KB (24K x 16 words) |
| SRAM | 3.8 KB (3840 bytes) |
| EEPROM | 1 KB |
| Maximum Clock Speed | 40 MHz |
| Supply Voltage Range | 2.0 V to 5.5 V (LF); ADC spec 4.2 V to 5.5 V |
| I/O Pins | 54 |
| ADC | 10-bit, up to 12 channels |
| Timers | 1 x 16-bit + 3 x 8-bit |
| CCP/ECCP Modules | 2 CCP + 1 ECCP |
| Communication Peripherals | 2 x USART, 1 x MSSP (I2C/SPI) |
| Analog Comparators | 2 |
| Parallel Slave Port | Yes |
| Package | TQFP-64 (10 x 10 mm, 1.0 mm pitch) |
| Operating Temperature | -40C to +85C (industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC18LF6525T-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 — PORTA bit 2 / analog input 2 |
| Pin 4 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| Pin 5 | RA4/AN4/T0CKI — PORTA bit 4 / analog input 4 / Timer0 clock |
| Pin 6 | RA5/AN5/SS/LVDIN — PORTA bit 5 / analog input 5 / SPI slave select / LVD input |
| Pin 7 | RA6 — PORTA bit 6 / oscillator output |
| Pin 8 | RA7 — PORTA bit 7 / oscillator input |
| Pin 9 | VSS — Ground reference |
| Pin 10 | VDD — Positive supply (2.0 V to 5.5 V) |
| Pin 11 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 12 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 13 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pin 14 | RB3/INT3 — PORTB bit 3 / external interrupt 3 |
| Pin 15 | RB4 — PORTB bit 4 |
| Pin 16 | RB5 — PORTB bit 5 |
| Pin 17 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 18 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply (2.0 V to 5.5 V) |
| Pin 21 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / clock in |
| Pin 22 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Pin 23 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| Pin 24 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 25 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 26 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 27 | RC6/TX1/CK1 — PORTC bit 6 / USART1 TX / clock |
| Pin 28 | RC7/RX1/DT1 — PORTC bit 7 / USART1 RX / data |
| Pin 29 | VSS — Ground reference |
| Pin 30 | VDD — Positive supply (2.0 V to 5.5 V) |
| Pin 31 | RD0/PSP0 — PORTD bit 0 / parallel slave port D0 |
| Pin 32 | RD1/PSP1 — PORTD bit 1 / parallel slave port D1 |
| Pin 33 | RD2/PSP2 — PORTD bit 2 / parallel slave port D2 |
| Pin 34 | RD3/PSP3 — PORTD bit 3 / parallel slave port D3 |
| Pin 35 | RD4/PSP4 — PORTD bit 4 / parallel slave port D4 |
| Pin 36 | RD5/PSP5 — PORTD bit 5 / parallel slave port D5 |
| Pin 37 | RD6/PSP6 — PORTD bit 6 / parallel slave port D6 |
| Pin 38 | RD7/PSP7 — PORTD bit 7 / parallel slave port D7 |
| Pin 39 | VSS — Ground reference |
| Pin 40 | VDD — Positive supply (2.0 V to 5.5 V) |
| Pin 41 | RE0/RD/AN6 — PORTE bit 0 / PSP read strobe / analog 6 |
| Pin 42 | RE1/WR/AN7 — PORTE bit 1 / PSP write strobe / analog 7 |
| Pin 43 | RE2/CS/AN8 — PORTE bit 2 / PSP chip select / analog 8 |
| Pin 44 | RE3 — PORTE bit 3 (input only) |
| Pin 45 | RE4 — PORTE bit 4 (input only) |
| Pin 46 | RE5 — PORTE bit 5 (input only) |
| Pin 47 | RE6 — PORTE bit 6 (input only) |
| Pin 48 | RE7 — PORTE bit 7 (input only) |
| Pin 49 | RF0 — PORTF bit 0 |
| Pin 50 | RF1 — PORTF bit 1 |
| Pin 51 | RF2 — PORTF bit 2 |
| Pin 52 | RF3 — PORTF bit 3 |
| Pin 53 | RF4 — PORTF bit 4 |
| Pin 54 | RF5 — PORTF bit 5 |
| Pin 55 | RF6 — PORTF bit 6 |
| Pin 56 | RF7 — PORTF bit 7 |
| Pin 57 | RG0 — PORTG bit 0 |
| Pin 58 | RG1 — PORTG bit 1 |
| Pin 59 | RG2 — PORTG bit 2 |
| Pin 60 | RG3 — PORTG bit 3 |
| Pin 61 | RG4 — PORTG bit 4 |
| Pin 62 | OSC1 — Crystal oscillator input |
| Pin 63 | OSC2 — Crystal oscillator output |
| Pin 64 | MCLR — Master clear reset (active low) |
Typical Applications
PIC18LF6525T-I/PT is suitable for 6 applications: Industrial Automation Controller, Building HVAC and Access Control Panels, Instrumentation Front-End with LCD/Keypad, Consumer Appliance Main Controller, Automotive Body and Chassis Subsystem, Peripheral Co-Processor via Parallel Slave Port.
Industrial Automation Controller
The PIC18LF6525T-I/PT is well suited for industrial automation PLCs and I/O modules because of its 54 I/O lines, two USART modules (often used for RS-485 Modbus RTU masters or slaves), and the parallel slave port for host-CPU offload. Its 48 KB Flash gives ample headroom for ladder-logic interpreters or state-machine firmware, while the 3.8 KB SRAM supports Modbus frame buffers and PID loop variables. The 10-bit ADC with 12 channels handles analog sensor inputs (4-20 mA, 0-10 V) directly. The LF 2.0 V-5.5 V range accommodates both 24 V-derived 3.3 V rails and battery-backed logic. Compared with newer PIC18FxxK42 parts, this device remains attractive where firmware legacy and long-term supply are critical.
Recommended
Building HVAC and Access Control Panels
HVAC controllers and access-control panels need many digital I/O for relay drivers, keypad scanning, and character LCDs - exactly the use case the PIC18LF6525T-I/PT addresses with 54 I/O, the parallel slave port for a co-processor, and an ECCP module for triac-fired PWM heater control. The 10-bit ADC reads thermistor inputs, while the two analog comparators handle zero-crossing detection for AC line sync. The 48 KB Flash accommodates menu-driven UI code, schedule storage in 1 KB EEPROM, and Modbus RTU or BACnet MS/TP stacks. The industrial -40C to +85C range supports rooftop and unconditioned-space installations. Low-power nanoWatt idle modes keep standby current below 1 mA for battery-backed RTC operation.
Recommended
Instrumentation Front-End with LCD/Keypad
Bench instruments (digital multimeters, process calibrators, lab power supplies) benefit from the PIC18LF6525T-I/PT's combination of a 10-bit ADC, two analog comparators, and abundant I/O for keypad matrix, character LCD, rotary encoder, and buzzer drive. The 48 KB Flash hosts menu systems and calibration tables stored in the 1 KB EEPROM. Two USARTs can drive a front-panel USB-to-UART bridge plus a second isolated RS-485 port for SCPI command parsing. The LF variant's 2.0 V minimum is useful for single-cell Li-ion powered handhelds. The ECCP module can generate PWM excitation for ratiometric sensor bridges, while the parallel slave port enables a host FPGA for high-speed data acquisition.
Recommended
Consumer Appliance Main Controller
Major appliances (washing machines, dishwashers, refrigerators) use an 8-bit MCU to drive user interfaces, motor control PWM, and sensor inputs - the PIC18LF6525T-I/PT fits with its ECCP for motor control, 12 ADC channels for temperature and water-level sensing, and 54 I/O for keypad, LCD, buzzer, and relay banks. The 48 KB Flash holds state-machine firmware with fault diagnostics, while the 1 KB EEPROM stores user settings through power cycles. Two USARTs support diagnostic ports and Bluetooth/wifi module bridges. The industrial temperature grade and RoHS compliance satisfy appliance certification requirements, and the long-life Microchip product cycle (active since early 2000s) gives designers multi-decade supply assurance.
Recommended
Automotive Body and Chassis Subsystem
Non-safety body-electronics modules (mirror controllers, seat-position memory, lighting controllers) commonly use the PIC18LF6525T-I/PT thanks to its 54 I/O, ECCP PWM for lighting fade, and 10-bit ADC for current sensing. The industrial temperature grade meets most cabin requirements, though for under-hood AEC-Q100 qualified designs the automotive-grade PIC18F alternatives should be selected. The 48 KB Flash hosts CAN-friendly state machines and diagnostic firmware; for native CAN support, designers move to the PIC18F4685 family. The parallel slave port allows pairing with an external graphics or communication co-processor. Multiple communication peripherals support LIN via UART plus external transceiver.
Recommended
Peripheral Co-Processor via Parallel Slave Port
The PIC18LF6525T-I/PT can offload real-time I/O, keypad scanning, or PWM generation from a host CPU or FPGA through its parallel slave port (PSP). The host writes control registers and reads status over the 8-bit data bus using RD, WR, and CS lines, freeing the main processor from bit-banging I/O. The MCU's 48 KB Flash and 3.8 KB SRAM allow local firmware with command queues, while the 10-bit ADC provides analog monitoring. Two USARTs and one MSSP can serve as bridges to RS-485 Modbus slaves, I2C sensors, or SPI peripherals. The LF 2.0 V-5.5 V operation interfaces directly with 3.3 V FPGAs and ASICs. Designers typically connect the PSP to an FPGA EMIF or a higher-end MCU's external bus interface.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF6525T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF6520T-I/PT | PIC18F6627T-I/PT | PIC18F6622T-I/PT | PIC18LF6722T-I/PT | PIC18F8722T-I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-64 (10 x 10 mm) | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 48 KB | 32 KB | 96 KB | 64 KB | 128 KB | 128 KB |
| RAM | 3.8 KB | 2 KB | 3.8 KB | 3.8 KB | 3.8 KB | 3.8 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum Clock Speed | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Supply Voltage Range | 2.0 V to 5.5 V (LF) | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) | 4.2 V to 5.5 V (F) | 2.0 V to 5.5 V (LF) | 4.2 V to 5.5 V (F) |
| I/O Pins | 54 | 54 | 54 | 54 | 54 | 70 |
| ADC Resolution / Channels | 10-bit / 12 ch | 10-bit / 12 ch | 10-bit / 12 ch | 10-bit / 12 ch | 10-bit / 12 ch | 10-bit / 16 ch |
Key Differentiators
- Extended 2.0 V minimum supply voltage (LF variant) (vs PIC18F6627T-I/PT)
- Balanced Flash footprint (48 KB) for cost-optimized designs (vs PIC18LF6520T-I/PT)
- Parallel Slave Port for host-CPU co-processing (vs PIC18LF6722T-I/PT)
Design Notes
The PIC18LF6525 supports 2.0 V to 5.5 V operation but the ADC parametric specification is 4.2 V to 5.5 V. Estimated: when running the ADC at lower voltages, VREF must come from the internal band-gap or an external reference; ADC accuracy will degrade. Use a 100 nF decoupling capacitor on each VDD pin pair plus a single 10 uF bulk capacitor near the MCU. The nanoWatt technology idle and sleep modes can reduce quiescent current to single-digit microamperes when the application does not require the ADC active.
TQFP-64 has 0.5 mm lead pitch - place the part on a 4-layer PCB with at least one solid ground plane under the package to provide thermal spreading and reference for the analog inputs. Keep the crystal oscillator traces within 5 mm of the OSC1/OSC2 pins and surround them with a ground pour. Place the ICSP PGC/PGD traces (RB6/RB7) so that an in-circuit programming header can be reached without crossing the analog input area. The parallel slave port pins (RD0-RD7, RE0-RE2) should be routed as an 8-bit bus with matched lengths if connected to an external FPGA or DSP host.
Migrating between PIC18F6525 (F-variant, 4.2 V minimum) and PIC18LF6525 (LF-variant, 2.0 V minimum) without re-validating the brown-out reset and ADC reference settings will cause field failures on brown-out. Always confirm the CONFIG3L register setting when porting firmware between F and LF variants. Also note that the parallel slave port (PSP) is mutually exclusive with the JTAG boundary scan on some PIC18F parts - disable JTAG in CONFIG to free the PSP. The TQFP-64 footprint has a center thermal pad on some variants - check the package drawing before designing the land pattern.
At industrial temperature range (-40C to +85C), the PIC18LF6525 in TQFP-64 (theta_JA approximately 50-60 C/W on a standard 4-layer JEDEC test board) can dissipate up to 1 W at room temperature without additional cooling. Estimated: at 40 MHz operation, the core current draw is roughly 15-20 mA at 5 V and 8-12 mA at 3.3 V, so thermal management is rarely a constraint. Designers running the parallel slave port bus at high speed or driving many GPIO simultaneously should check the absolute maximum supply current specification in DS39646F.
Compliance Information
RoHS compliant per Microchip product environmental declaration. Lead-free /PT package code confirms lead-free terminal finish. Halogen-free per Microchip material declaration. Industrial temperature grade - not AEC-Q100 qualified; for automotive applications select the automotive-grade PIC18F alternative.
