PIC18LF252T-I/SOG - 32KB Flash 8-bit MCU 28-SOIC | Microchip
MPN: PIC18LF252T-I/SOG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.1 | $8.10 |
| 10 | $7.28 | $72.80 |
| 100 | $6.15 | $615.00 |
| 500 | $5.62 | $2,810.00 |
| 1,000 | $5.18 | $5,180.00 |
PIC18LF252T-I/SOG Overview
An 8-bit microcontroller is a single-chip computer built around a processor with an 8-bit data path, integrated program memory (Flash/ROM), working memory (RAM), and peripherals such as timers, ADC, USART, I/O ports, and interrupt controllers. PIC18F-family MCUs from Microchip use a RISC Harvard architecture and provide up to 10 MIPS at 40 MHz, targeting embedded control in industrial, consumer, automotive, and low-power applications. Within Microchip's portfolio, PIC18LF devices sit below the standard PIC18F parts and use 'LF' to mark the wider VDD range and lower-voltage capability.
Key features of the PIC18LF252T-I/SOG include 32 KB Flash for code storage, 1.5 KB RAM, 256 bytes of data EEPROM, 23 digital I/O pins, one 8-bit and three 16-bit timers, a 10-bit ADC with up to 5 channels, a USART, an MSSP (SPI/I2C) port, two analog comparators, and a capture/compare/PWM (CCP) module. The wide 2.0–5.5 V operating range makes the part suitable for both 3.3 V and 5 V rails. The 28-SOIC wide-body package (300 mil) provides a thermally robust footprint for hand-soldered prototypes and production boards.
The PIC18LF252 architecture uses a 16-bit instruction word with 8-bit data, supporting linear memory addressing and a hardware multiplier. The nanoWatt power-management features include multiple idle and sleep modes with peripheral gating, allowing the core to consume microamp-level current in deep sleep, which is critical for battery-powered and always-on designs.
Typical applications include industrial sensor interface modules, low-power data loggers, motor-control signal conditioning, building automation controllers, and battery-powered instrumentation. The PIC18LF252T-I/SOG is also widely used as a cost-optimized main controller in HVAC thermostats, access control panels, and small consumer appliances where a CAN-less, USB-less MCU is sufficient.
When designing with the PIC18LF252T-I/SOG, ensure decoupling capacitors (typically 100 nF plus a bulk 10 µF) are placed within 5 mm of the VDD pins, and that the MCLR pin is pulled high through a 10 kΩ resistor for normal operation. MPLAB X IDE with the XC8 compiler is the recommended firmware toolchain for this family.
This page synthesizes distributor pricing, same-brand drop-in alternatives, and practical design notes not aggregated on a single datasheet or distributor page, giving engineers a one-stop reference for PIC18LF252T-I/SOG selection.
Drop-in alternatives for PIC18LF252T-I/SOG — 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 PIC18LF252T-I/SOG (same form factor and footprint) — differing in Package, Timers, ADC, Core Architecture, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18LF252-I/SO
✅ Drop-In✓ In Stock
$7.65 / Unit
View Datasheet →PIC18F252-I/SO
✅ Drop-In✓ In Stock
$3.95 / Unit
View Datasheet →PIC18F25K22-I/SO
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →PIC18LF2520-I/SO
✅ Drop-In✓ In Stock
$4.47 / Unit
View Datasheet →PIC18LF2423-I/SO
✅ Drop-In✓ In Stock
$2.89 / Unit
View Datasheet →PIC18LF252T-I/SOG Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18F (8-bit RISC Harvard) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 1.5 KB (1536 bytes) |
| Data EEPROM | 256 bytes |
| Maximum CPU Frequency | 40 MHz |
| Operating Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 23 |
| Timers | 1 x 8-bit, 3 x 16-bit |
| ADC | 10-bit, up to 5 channels |
| Communication Peripherals | 1 x USART, 1 x MSSP (SPI/I2C) |
| PWM/CCP Modules | 1 x CCP |
| Analog Comparators | 2 |
| Package | 28-SOIC (wide body, 300 mil) |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (Lead-Free) |
| Programming Interface | ICSP (In-Circuit Serial Programming) |
PIC18LF252T-I/SOG 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 / ADC VREF- |
| Pin 4 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| Pin 5 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock / Comparator 1 output |
| Pin 6 | RA5/AN4/SS/C2OUT — PORTA bit 5 / Analog input 4 / SPI Slave Select / Comparator 2 output |
| Pin 7 | OSC1/CLKI/RA7 — Crystal oscillator input / External clock input / PORTA bit 7 |
| Pin 8 | OSC2/CLKO/RA6 — Crystal oscillator output / Clock output / PORTA bit 6 |
| Pin 9 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 10 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 11 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 12 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 13 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 14 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 15 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Pin 16 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 17 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| Pin 18 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Pin 19 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| Pin 20 | RB3/CCP2 — PORTB bit 3 / CCP2 alternate |
| Pin 21 | RB4 — PORTB bit 4 (interrupt-on-change) |
| Pin 22 | RB5/PGM — PORTB bit 5 / Low-voltage ICSP |
| Pin 23 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 24 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 25 | VSS — Ground reference |
| Pin 26 | VDD — Positive supply (2.0 V to 5.5 V) |
| Pin 27 | MCLR/VPP/RE3 — Master Clear reset / Programming voltage / PORTE bit 3 |
| Pin 28 | RA0/AN0 — Not connected (alternate function remap) |
Typical Applications
PIC18LF252T-I/SOG is suitable for 6 applications: Industrial Sensor Interface Module, Battery-Powered Data Logger, HVAC Thermostat Controller, Building Automation Sub-Controller, Small Appliance Control Board, Access Control Panel Reader.
Industrial Sensor Interface Module
The PIC18LF252T-I/SOG fits industrial 4-20 mA and 0-10 V sensor interface boards because it integrates a 10-bit ADC with up to 5 channels, a hardware USART for RS-232/RS-485 link, and an MSSP port for SPI/I2C sensor expansion, all inside a 28-SOIC footprint that drops onto standard sensor daughtercards. Its 2.0-5.5 V VDD range lets a single design run from 3.3 V sensors or 5 V transducer rails without a level shifter, and the -40C to +85C industrial rating covers factory-floor ambient conditions. The 32 KB Flash and 1.5 KB RAM comfortably hold Modbus RTU state machines and linearization lookup tables.
Recommended
Battery-Powered Data Logger
For remote data-logging designs running from 2xAA or a single LiFeS2 cell, the PIC18LF252T-I/SOG's nanoWatt technology keeps sleep current under 1 µA while leaving the ADC and WDT alive, and its 2.0 V minimum VDD lets the logger run down to battery depletion. The 32 KB Flash stores firmware plus a small FAT table, while 1.5 KB RAM buffers sensor reads between writes, and the I2C MSSP port talks to external EEPROM or FRAM for non-volatile event storage. Periodic wakeups every few seconds extend battery life to 1-2 years on a 2000 mAh cell, making it ideal for cold-chain or asset-tracking loggers.
Recommended
HVAC Thermostat Controller
The PIC18LF252T-I/SOG is a strong fit for residential HVAC thermostats because it combines a 10-bit ADC for NTC temperature sensing, a CCP module for PWM-controlled relay or triac firing, and a USART for optional Wi-Fi/BLE module handoff (e.g., ESP-01) on a single 28-SOIC. The 23 digital I/O pins handle the LCD interface, keypad matrix, mode switches, and fan control outputs. The 32 KB Flash is plenty for a 7-day programmable schedule and PID loop, while the wide 2.0-5.5 V VDD tolerates 24 VAC-derived unregulated rails without brownout issues at 3.3 V.
Recommended
Building Automation Sub-Controller
In a BACnet or Modbus sub-controller mounted on a 35 mm DIN rail, the PIC18LF252T-I/SOG acts as the local decision node that aggregates multiple 24 V digital inputs, drives relay outputs via the CCP/PWM module, and exposes a single RS-485 link upstream to the building automation controller. The 23 I/O pins handle typical 8-12 digital inputs and 4-8 relay outputs, leaving headroom for status LEDs and a local service port. Industrial -40C to +85C operation tolerates unheated electrical closets, and the 28-SOIC wide-body package is hand-solderable for field retrofits and engineering rebuilds.
Recommended
Small Appliance Control Board
For cost-sensitive consumer appliances such as coffee makers, rice cookers, or simple washing-machine controllers, the PIC18LF252T-I/SOG delivers a complete 8-bit platform with 32 KB Flash for application code, a 10-bit ADC for sensor reading (temperature, water level), and a CCP for triac-based heating element PWM. Its 28-SOIC wide-body is forgiving for hand-assembly lines common in white-goods manufacturing, and the 2.0-5.5 V VDD range tolerates unregulated mains-derived 5 V or 3.3 V rails. Sleep currents below 1 µA keep standby power under 0.5 W for energy-star compliance.
Recommended
Access Control Panel Reader
The PIC18LF252T-I/SOG forms the core of a Wiegand or OSDP access-control reader because it has a hardware USART for OSDP half-duplex RS-485, an MSSP for SPI-connected RFID/NFC modules, and enough Flash (32 KB) to hold cryptographic helpers and reader configuration. The 23 I/O pins support a 4x4 keypad, two-color LED driver lines, and a buzzer PWM output. Industrial temperature rating ensures operation in unheated vestibules or outdoor enclosures, while the 28-SOIC package survives the long product lifecycle of physical-security installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LF252T-I/SOG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18LF252-I/SO | PIC18F252-I/SO | PIC18F25K22-I/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (wide, 300 mil) | 28-SOIC (wide, 300 mil) - same | 28-SOIC (wide, 300 mil) - same | 28-SOIC (wide, 300 mil) - same |
| Flash Program Memory | 32 KB | 32 KB | 32 KB | 32 KB |
| RAM | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB |
| Max CPU Frequency | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 64 MHz / 16 MIPS |
| Operating Voltage (VDD) | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.3 V to 5.5 V |
| ADC | 10-bit, 5 channels | 10-bit, 5 channels | 10-bit, 5 channels | 10-bit, 14 channels |
| Communication Peripherals | 1x USART, 1x MSSP (SPI/I2C) | 1x USART, 1x MSSP | 1x USART, 1x MSSP | 2x USART, 2x MSSP, 1x CAN |
| I/O Pins | 23 | 23 | 23 | 24 |
Key Differentiators
- Wide 2.0 V minimum VDD supports single-cell battery designs (vs PIC18F252-I/SO)
- Tape-and-reel packaging matches SMT production lines (vs PIC18LF252-I/SO)
- nanoWatt power-management for sub-microamp sleep (vs PIC18F25K22-I/SO)
Design Notes
Place a 100 nF ceramic decoupling capacitor within 5 mm of pin 26 (VDD) and a 10 µF bulk capacitor near the same node; the PIC18LF252T-I/SOG can switch I/O pins at high edge rates that inject brief VDD transients, and inadequate decoupling causes ADC noise and spurious BOR resets. Tie pin 27 (MCLR/VPP) to VDD through a 10 kΩ resistor for normal operation; never leave MCLR floating because stray injection can cause unintended resets. The wide 2.0-5.5 V range lets you run directly from a 3.3 V LDO without a separate 5 V rail, simplifying BOM.
Keep the crystal or external clock traces (pins 7 and 8) short and guarded by a ground ring to minimize EMI pickup; oscillator traces longer than 5 mm can inject harmonics into nearby analog inputs and degrade ADC accuracy. Route the analog inputs (RA0-RA5) away from digital switching lines, and keep the AGND/VSS connection at a single-point star near the IC's ground pin. If using the ADC, place a small RC filter (10 Ω + 100 nF) at each analog input to suppress switching noise from adjacent digital lines.
Do not exceed 5.5 V on VDD even momentarily: although the LF version tolerates lower VDD, the absolute maximum VDD is 5.5 V and transient overshoot from a poorly filtered supply can damage the part. Configure the Configuration Words (CONFIG1H, CONFIG2L, etc.) before the first instruction; leaving the oscillator and WDT bits at default can result in unexpected clock sources or watchdog timeouts. When migrating to PIC18F25K22-I/SO, note that some registers (especially ADC and MSSP) have different bit layouts and require firmware updates.
The PIC18LF252T-I/SOG does not include a built-in CAN or USB peripheral; if you need those interfaces, migrate to PIC18F25K22-I/SO (CAN) or PIC18F14K50-I/SO (USB) on the same 28-SOIC footprint. The I2C MSSP module requires 4.7 kΩ pull-ups on SDA/SCL for reliable operation at 400 kHz; lower pull-up values draw more current and may exceed the 25 mA sink capability of the I/O pin. For long-distance RS-485, add a 120 Ω termination at the bus ends and bias resistors to prevent false start bits when the bus is idle.
Compliance Information
Lead-free (Pb-free) terminal finish per Microchip product page; RoHS and REACH compliant per EU directives. Industrial -40C to +85C operating temperature grade; not AEC-Q100 qualified (for automotive, choose PIC18F252-I/SO automotive variants or PIC18FxxK22 family).
