PIC18F452T-I/L - 8-Bit 40MHz 32KB Flash MCU 44-PLCC | Microchip
MPN: PIC18F452T-I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.32 | $6.32 |
| 10 | $5.78 | $57.80 |
| 100 | $5.05 | $505.00 |
| 500 | $4.42 | $2,210.00 |
| 1,000 | $3.88 | $3,880.00 |
PIC18F452T-I/L Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, on-chip FLASH program memory, RAM, peripherals, and an arithmetic-logic unit. Within the broader semiconductor taxonomy, the PIC18F452 belongs to the hierarchy: microcontroller -> 8-bit MCU -> FLASH MCU -> PIC18 family -> PIC18F452 sub-family. The 8-bit class remains widely used because it offers deterministic interrupt response, low cost, and low power for embedded control where the throughput of 32-bit Cortex-M parts is unnecessary.
Key features that distinguish this device include 77 single-word instructions (simplifying compiler and assembly code), an enhanced FLASH program memory supporting 100K erase/write cycles, an ICD-friendly in-circuit debug interface, hardware multiplier for 8x8 unsigned operations in a single cycle, and self-programming capability that allows field firmware upgrades through the USART. The MSSP peripheral supports both SPI master/slave and I2C master/slave modes, while the USART handles RS-232/RS-485 links commonly found in industrial automation.
Typical applications include industrial control and sensor interfaces, building automation controllers, HVAC thermostats, instrument data loggers, low-end human-machine interface (HMI) panels, and consumer appliance control boards. Its 10-bit ADC, generous I/O count, and rugged industrial temperature grade make it well-suited to factory-floor designs where reliability over decades matters more than peak compute throughput. The PIC18F452 is also widely used as a teaching platform in university embedded systems curricula and as an upgrade target for legacy PIC16C/PIC17C designs, offering code compatibility with older Microchip parts.
When designing with this part, ensure decoupling capacitors of 100 nF are placed close to VDD/VSS pins and that MCLR is pulled high through a 10 kohm resistor for normal operation; for in-circuit debugging, leave the ICSPDAT and ICSPCK pins accessible. Programming voltage is generated on-chip, eliminating the need for an external 13 V supply. Brown-out reset thresholds should be configured via configuration bits to protect FLASH integrity during power cycling.
Drop-in alternatives for PIC18F452T-I/L — 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 PIC18F452T-I/L (same form factor and footprint) — differing in Package, Mounting Type, RoHS Status, ADC, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F452-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F452-E/L
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$8.4 / Unit
View Datasheet →PIC18F448-I/L
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$11.5 / Unit
View Datasheet →PIC18F442-I/L
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.75 / Unit
View Datasheet →PIC18F4550-I/L
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F4520-I/P
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.35 / Unit
View Datasheet →PIC18F452T-I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18, 8-bit |
| Maximum Clock Speed | 40 MHz |
| Performance | 10 MIPS (100 ns instruction cycle) |
| Program Memory | 32 KB FLASH (16K x 16) |
| Data RAM | 1.5 KB (1536 bytes) |
| Data EEPROM | 256 bytes |
| Supply Voltage | 4.2 V to 5.5 V |
| Digital I/O Pins | 34 (5V tolerant on Port B/D) |
| ADC | 10-bit, up to 8 channels |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Communication | USART (RS-232/RS-485), MSSP (SPI/I2C) |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| Package | 44-pin PLCC (16.59 x 16.59 mm) |
| Mounting Type | Surface Mount |
| Instruction Set | 77 single-word instructions |
| RoHS Status | Compliant |
PIC18F452T-I/L Pin Configuration
| Pin 1 | MCLR/VPP — Master clear reset / ICSP programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | RE0/RD/AN5 — PORTE bit 0 / Read control for PSP / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / Write control for PSP / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / Chip select for PSP / Analog input 7 |
| Pin 11 | VDD — Positive supply voltage (4.2V-5.5V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKI — Oscillator crystal input / external clock input |
| Pin 14 | OSC2/CLKO — Oscillator crystal output / clock output |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM/capture/compare |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 20 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 21 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 22 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Pin 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — PORTC bit 6 / USART async transmit / clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART async receive / data |
| Pin 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 29 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 30 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage (4.2V-5.5V) |
| Pin 33 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| Pin 34 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| Pin 35 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| Pin 36 | RB3/CCP2 — PORTB bit 3 / CCP2 |
| Pin 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| Pin 38 | RB5/PGM — PORTB bit 5 / Low-voltage ICSP programming |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC18F452T-I/L is suitable for 7 applications: Industrial Sensor Interface Controller, HVAC Thermostat and Building Automation, Appliance Control Board (White Goods), Portable Data Logger, HMI Panel Controller, Educational Embedded Systems Platform, Low-End Motor Control (BLDC / Stepper).
Industrial Sensor Interface Controller
The PIC18F452T-I/L is well suited to industrial sensor hubs where 34 digital I/O lines and a 10-bit ADC are needed to read multiple 4-20 mA loops, thermistors, and digital encoders. With 40 MHz operation (10 MIPS) and 32 KB FLASH, the device handles C-compiled sensor fusion, PID loops, and Modbus RTU over the hardware USART. Industrial -40 °C to +85 °C operation ensures deployment on factory floors where ambient temperatures fluctuate widely. Place the MCU on an RS-485 bus with the USART for multi-drop sensor networks.
Recommended
HVAC Thermostat and Building Automation
In HVAC and building automation controllers, the PIC18F452T-I/L's 32 KB FLASH accommodates Modbus, BACnet MS-TP, and proprietary thermostat firmware while its nanoWatt Technology drops quiescent current during battery-backed thermostat standby to microamp levels. The 10-bit ADC reads thermistor temperature sensors with adequate resolution for ±0.5 °C setpoint control, and three 16-bit timers drive triac-based heater/cool actuator timing. Use MSSP in I2C mode to interface LCD keypads and external RTC chips.
Recommended
Appliance Control Board (White Goods)
The PIC18F452T-I/L serves washing-machine, dishwasher, and oven control boards where its 77 single-word PIC18 instructions simplify MISRA-style safety-critical firmware in C. With 34 I/O pins it directly drives triac optocouplers, relay coils, and seven-segment LED displays without external expanders, while the 10-bit ADC monitors motor current and temperature. Industrial temperature grade handles the steam and heat of kitchen environments, and 100K FLASH endurance supports the 10-15 year field life typical of white goods.
Recommended
Portable Data Logger
For battery-powered portable data loggers, the PIC18F452T-I/L's nanoWatt Technology enables sleep currents under 1 µA, allowing weeks of unattended recording from two AA cells. The 32 KB FLASH stores application code while 256 bytes of data EEPROM retains calibration constants and time stamps across battery swaps. The MSSP I2C bus interfaces to external FRAM for high-endurance log storage, and the 10-bit ADC captures analog sensor inputs at up to 100 ksps aggregate sampling.
Recommended
HMI Panel Controller
In human-machine interface panels, the PIC18F452T-I/L drives character LCDs and matrix keypads via the parallel I/O ports while the USART communicates with a host PLC over RS-232 or RS-485. Its 40 MHz throughput (10 MIPS) is sufficient to debounce keypads, render menu hierarchies, and service Modbus transactions within millisecond response budgets. PIC18 code compatibility eases migration from older PIC16C/PIC17C panel designs.
Recommended
Educational Embedded Systems Platform
Universities and training institutes use the PIC18F452T-I/L on development boards to teach 8-bit embedded programming, interrupts, and peripheral interfacing thanks to the PIC18 architecture's simple 77-instruction set and free MPLAB X IDE + XC8 toolchain. The 44-pin PLCC is breadboard-friendly via PLCC-to-DIP adapters, and ICSP allows live debugging without removing the part. The PIC18F452 lineage has decades of application notes, sample code, and textbook references supporting curriculum delivery.
Recommended
Low-End Motor Control (BLDC / Stepper)
For cost-sensitive BLDC and stepper motor controllers under 1 kg, the PIC18F452T-I/L's three 16-bit timers generate PWM channels for H-bridge commutation and its 10-bit ADC reads back EMF sensing on three phases. The hardware USART supports RS-485 daisy-chained motor nodes, and 32 KB FLASH holds sensorless commutation tables plus a small state machine. For higher-performance FOC, designers migrate to dsPIC33 or PIC32MK families in the same Microchip ecosystem.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F452T-I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F452-I/L | PIC18F4550-I/L | PIC18F442-I/L |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (16.59x16.59 mm) | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Program FLASH | 32 KB (16K x 16) | 32 KB | 32 KB | 16 KB (-50%) |
| Data RAM | 1.5 KB (1536 B) | 1.5 KB | 2 KB (+33%) | 768 B (-49%) |
| Maximum Clock | 40 MHz (10 MIPS) | 40 MHz | 48 MHz (+20%) | 40 MHz |
| ADC Resolution | 10-bit, 8 channels | 10-bit, 8 ch | 10-bit, 13 ch | 10-bit, 8 ch |
| USB Peripheral | No | No | Yes, USB 2.0 FS | No |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V |
| Industrial Temp Grade | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Key Differentiators
- Tape-and-reel format for high-volume SMT assembly (vs PIC18F452-I/L)
- On-chip USB 2.0 FS not present, but extensive general-purpose peripherals (vs PIC18F4550-I/L)
- 32 KB FLASH doubles program headroom vs PIC18F442 (vs PIC18F442-I/L)
- Industrial -40 °C to +85 °C operation standard (vs PIC18F452-E/L)
Design Notes
Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD/VSS pin pair (pins 11/12 and 32/31 on the 44-PLCC), plus a bulk 10 µF tantalum or aluminum polymer capacitor near the IC. The PIC18F452T-I/L powers up with MCLR held low; tie MCLR to VDD through a 10 kohm resistor and add a 100 nF cap to ground for noise immunity. Brown-out reset should be enabled in configuration bits to protect FLASH integrity below 4.0 V.
Route the 40 MHz oscillator traces (OSC1/OSC2, pins 13/14) on the top layer under 1 cm of length, guard them with a GND ring, and keep high-current digital traces away. When using a crystal, place load capacitors (typically 15-33 pF) within 3 mm of the OSC pins. For best ADC accuracy, dedicate an AVSS pin trace back to a clean star-ground point; the PIC18F452 lacks dedicated AVSS but VSS at pin 12 should be the ADC reference ground.
Do not omit the MCLR pull-up resistor (10 kohm to VDD); leaving MCLR floating causes spurious resets. For in-circuit serial programming (ICSP), the RB6/PGC and RB7/PGD pins must be accessible - do not load them with heavy capacitance that slows the ICSP clock below 2 MHz. Configuration bits must be set before code execution; an unprogrammed CONFIG reads all 1s, which can disable the PLL, brown-out reset, and watchdog - often a frustrating debug-time discovery.
When the 44-pin PLCC drives long cables from USART (RS-485) or I2C (MSSP), add 100 ohm source-termination on each differential pair and a TVS diode array at the connector. The PIC18F452T-I/L does not include slew-rate control on I/O; for EMI-sensitive applications, place 100 ohm series resistors on toggling outputs. PORTB has weak internal pull-ups that can be enabled per pin in software - use them for keyswitch inputs instead of external resistors where possible.
Compliance Information
RoHS compliant per Microchip product page; lead-free matte-tin plating on PLCC leads. Not AEC-Q100 qualified; choose PIC18F452-E/L (extended temp) for automotive. PIC18F452 family supports IEC 60730 Class B software safety requirements for white-goods.
