PIC18F452-I/P - 8-bit 40MHz 32KB Flash MCU 40-PDIP | Microchip
MPN: PIC18F452-I/P ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.42 | $7.42 |
| 10 | $6.85 | $68.50 |
| 100 | $6.21 | $621.00 |
| 500 | $5.64 | $2,820.00 |
| 1,000 | $5.1 | $5,100.00 |
PIC18F452-I/P Overview
A microcontroller (MCU) is a single-chip computer containing a processor core, program and data memory, plus configurable peripherals. PIC18F devices belong to Microchip's 8-bit PIC family, which combines RISC architecture with C-compiler-friendly instruction set and NanoWatt power management. Within the broader taxonomy, PIC18F452 sits under Microcontroller (MCU) -> 8-bit MCU -> PIC18F enhanced Flash family -> embedded computing IC -> semiconductor.
Key features include 34 digital I/O pins, an 8-channel 10-bit Analog-to-Digital Converter (ADC), two Capture/Compare/PWM (CCP) modules, an enhanced USART supporting RS-232/RS-485, a Master Synchronous Serial Port configurable as SPI (3-wire) or I2C (2-wire), one 8-bit and three 16-bit timers, self-programming capability, and ICD in-circuit debugging support. Operating voltage spans 4.2 V to 5.5 V across the industrial -40C to +85C temperature range.
The PIC18F452 uses an enhanced Harvard architecture with a 16-bit instruction word and separate program/data buses, achieving 100 ns instruction execution. The 77 single-word instruction set simplifies C compiler code generation while the 16-level hardware stack and 8 x 8 hardware multiplier accelerate arithmetic throughput. NanoWatt technology adds multiple power-managed modes (Idle, Sleep) for battery-aware designs.
Typical applications include industrial control panels, HVAC and appliance controllers, sensor signal conditioning nodes, RS-232/RS-485 sensor gateways, motor control interfaces (using CCP/PWM), low-cost data acquisition with on-chip ADC, and educational/COMPILER development platforms. The wide 4.2-5.5 V range also suits USB-powered and 5 V bus systems.
When designing with this part, ensure oscillator stability (HS or XT modes), use adequate decoupling (100 nF near each VDD/VSS pair), and verify ADC acquisition time settings for chosen source impedance. Note the I/P suffix denotes industrial temperature grade and PDIP-40 package.
This page synthesizes distributor pricing across DigiKey, Mouser and LCSC, drop-in PIC18F alternatives, and practical design notes that are not found in the standalone manufacturer datasheet.
Drop-in alternatives for PIC18F452-I/P — 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 PIC18F452-I/P (same form factor and footprint) — differing in Operating Temperature, ADC, Timers, Package, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F452-E/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F452-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4520-I/P
✅ Drop-In✓ In Stock
$5.35 / Unit
View Datasheet →PIC18F442-I/P
✅ Drop-In✓ In Stock
$5.4 / Unit
View Datasheet →PIC18F458-I/P
✅ Drop-In✓ In Stock
$7.45 / Unit
View Datasheet →PIC18F452-I/P Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC18F enhanced Harvard |
| Program Memory (Flash) | 32 KB (16K x 16 words) |
| RAM | 1536 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Operating Voltage (VDD) | 4.2 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 8-channel, 10-bit |
| Timers | 1 x 8-bit + 3 x 16-bit |
| CCP/PWM Modules | 2 |
| Communication | USART (RS-232/RS-485), MSSP (SPI/I2C) |
| Self-Programming | Yes |
| In-Circuit Debug (ICD) | Yes |
| Operating Temperature | -40C to +85C (industrial, -I suffix) |
| Package | 40-pin PDIP (DIP-40), 0.600 inch width |
| Mounting Type | Through-Hole (THT) |
| RoHS Status | Compliant |
| Instruction Set | 77 single-word instructions |
| Power-Saving Modes | NanoWatt (Idle, Sleep, Run modes) |
| Hardware Multiplier | 8 x 8 |
PIC18F452-I/P Pin Configuration
| Pin 1 | MCLR/VPP/RA3 — Master clear reset (active low) / programming voltage / port A bit 3 |
| Pin 2 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Pin 4 | RA2/AN2/VREF- — Port A bit 2 / analog input 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — Port A bit 3 / analog input 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Pin 7 | RA5/AN4/SS — Port A bit 5 / analog input 4 / SPI slave select |
| Pin 8 | RE0/RD/AN5 — Port E bit 0 / read control / analog input 5 |
| Pin 9 | RE1/WR/AN6 — Port E bit 1 / write control / analog input 6 |
| Pin 10 | RE2/CS/AN7 — Port E bit 2 / chip select / analog input 7 |
| Pin 11 | VSS — Ground reference |
| Pin 12 | VDD — Positive supply voltage (4.2 V to 5.5 V) |
| Pin 13 | OSC1/CLKI/RA7 — Oscillator input / external clock / port A bit 7 |
| Pin 14 | OSC2/CLKO/RA6 — Oscillator output / clock output / port A bit 6 |
| Pin 15 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / T1 clock in |
| Pin 16 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator in / CCP2 |
| Pin 17 | RC2/CCP1 — Port C bit 2 / CCP1 PWM/capture/compare |
| Pin 18 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 — Port D bit 0 / parallel slave port bit 0 |
| Pin 20 | RD1/PSP1 — Port D bit 1 / parallel slave port bit 1 |
| Pin 21 | RD2/PSP2 — Port D bit 2 / parallel slave port bit 2 |
| Pin 22 | RD3/PSP3 — Port D bit 3 / parallel slave port bit 3 |
| Pin 23 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — Port C bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| Pin 26 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| Pin 27 | RD4/PSP4 — Port D bit 4 / parallel slave port bit 4 |
| Pin 28 | RD5/PSP5 — Port D bit 5 / parallel slave port bit 5 |
| Pin 29 | RD6/PSP6 — Port D bit 6 / parallel slave port bit 6 |
| Pin 30 | RD7/PSP7 — Port D bit 7 / parallel slave port bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage (4.2 V to 5.5 V) |
| Pin 33 | RB0/INT0 — Port B bit 0 / external interrupt 0 |
| Pin 34 | RB1/INT1 — Port B bit 1 / external interrupt 1 |
| Pin 35 | RB2/INT2 — Port B bit 2 / external interrupt 2 |
| Pin 36 | RB3/CCP2 — Port B bit 3 / CCP2 alternate |
| Pin 37 | RB4 — Port B bit 4 |
| Pin 38 | RB5/PGM — Port B bit 5 / LVP programming |
| Pin 39 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — Port B bit 7 / ICSP data |
Typical Applications
PIC18F452-I/P is suitable for 6 applications: Industrial Sensor Hub, HVAC and Appliance Controller, RS-232/RS-485 Sensor Gateway, Educational Development Platform, Motor and PWM Control, Data Acquisition Front-End.
Industrial Sensor Hub
The PIC18F452-I/P is well-suited as a sensor hub in industrial enclosures. Its 8-channel 10-bit ADC samples up to eight analog inputs - thermocouples, pressure transducers or 4-20 mA loop signals - while the two CCP/PWM modules drive actuator outputs or LED indicators. The 1536 bytes of RAM and 32 KB Flash comfortably host a Modbus RTU slave on the USART. Operating from 4.2-5.5 V and industrial -40C to +85C, the part tolerates typical 24 V-to-5 V regulated rails in factory cabinets. Recommended companions: MAX485 (RS-485 transceiver), MCP9700 (analog temperature sensor), and 24LC256 (I2C EEPROM) for parameter storage.
Recommended
HVAC and Appliance Controller
In HVAC blower or appliance control boards, the PIC18F452-I/P's 34 I/O pins scan keypads, drive multiplexed 7-segment or LCD displays, and switch triac/relay outputs through opto-isolated drivers. The 16-bit timers provide precise debounce and PWM control for fan speeds, while the USART links to a Wi-Fi or BLE module for remote control. NanoWatt power-save modes reduce standby draw to a few microamps - critical for ENERGY STAR compliance. The 40-PDIP footprint simplifies hand-solderable prototyping and through-hole production runs. Recommended companions: MOC3021 (triac driver), ULN2003 (relay driver), and ESP8266 (Wi-Fi connectivity).
Recommended
RS-232/RS-485 Sensor Gateway
The PIC18F452-I/P acts as a low-cost bridge between legacy RS-232/RS-485 sensor networks and a master controller or cloud gateway. The enhanced USART supports both RS-232 and RS-485 protocols with hardware address detection for multidrop configurations, while the MSSP port runs I2C or SPI to a local sensor cluster. The 8-channel ADC accepts analog sensor inputs that the MCU digitizes and forwards as Modbus ASCII/RTU frames. With 32 KB Flash, custom command sets, calibration routines and TLS-lite wrappers fit comfortably. Industrial -40C to +85C operation suits outdoor enclosures. Recommended companions: MAX232 (RS-232 transceiver), MAX485 (RS-485 transceiver), and W25Q32 (SPI Flash for logging).
Recommended
Educational Development Platform
The PIC18F452-I/P is widely used in university embedded-systems curricula due to its 40-PDIP through-hole package - breadboard-friendly and tolerant of student wiring mistakes. The 77 single-word instruction set is well-documented and pairs with Microchip's MPLAB X IDE, XC8 compiler and PICkit programmers. Educational labs cover ADC sampling, PWM motor control, I2C/SPI peripheral exploration, and USART-based PC communication through a terminal. The self-programming and ICD features let students debug in real time. 32 KB Flash and 1536 bytes RAM support textbook-sized C projects without hitting resource walls. Recommended companions: PICkit 3 (programmer/debugger), 16x2 LCD module, and four-channel RC servo motor.
Recommended
Motor and PWM Control
The PIC18F452-I/P's two CCP/PWM modules and three 16-bit timers drive brushless DC, brushed DC and stepper motor control loops up to tens of kilohertz switching frequency. The 8-channel ADC samples back-EMF or current-shunt signals for closed-loop control, while the MSSP SPI port talks to intelligent gate drivers like the MCP8024. NanoWatt idle mode extends battery life in portable pump or robot applications. The 40-PDIP package supports a rugged industrial BOM with conformal coating and through-hole reliability. Recommended companions: MCP8024 (3-phase BLDC gate driver), ACS712 (current sensor), and L6234 (DMOS driver).
Recommended
Data Acquisition Front-End
The PIC18F452-I/P's 8-channel 10-bit ADC, dual USART and MSSP peripheral mix make it a capable data-acquisition front-end for laboratory instrumentation. With acquisition rates up to ~50 ksps aggregate and on-chip timers triggering precise sample intervals, it captures waveforms from sensors, strain gauges or analog front-ends. Data streams out the USART to a PC or over SPI to an external SD card. 32 KB Flash holds calibration tables and DSP-like FIR filters in C, while the ICD port enables real-time variable inspection. Industrial temperature grade and 4.2-5.5 V operation suit bench-top equipment. Recommended companions: ADS1115 (16-bit external ADC upgrade), MCP4725 (DAC for stimulus), and 23LC1024 (SPI SRAM buffer).
Recommended
Recommended Products Summary
Engineering reference data for PIC18F452-I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F452-E/P | PIC18F4520-I/P | PIC18F458-I/P | PIC18F442-I/P |
|---|---|---|---|---|---|
| Package | 40-PDIP | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB |
| RAM | 1536 bytes | 1536 bytes | 2048 bytes | 1536 bytes | 768 bytes |
| EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Maximum CPU Speed | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS | 40 MHz / 10 MIPS |
| Operating 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 | 4.2 V to 5.5 V |
| Temperature Grade | Industrial -40C to +85C | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| Special Peripheral | USART + MSSP (SPI/I2C) | USART + MSSP (SPI/I2C) | Enhanced USART + MSSP (SPI/I2C) | USART + MSSP + CAN 2.0B | USART + MSSP (SPI/I2C) |
| ADC Channels | 8 x 10-bit | 8 x 10-bit | 13 x 10-bit | 8 x 10-bit | 8 x 10-bit |
Key Differentiators
- Established PIC18F family with proven legacy firmware and toolchain support (vs PIC18F4520-I/P)
- Lower cost option with same 32 KB Flash footprint as higher-tier peers (vs PIC18F458-I/P)
- In-circuit debugging via ICD pins (RB6/RB7) without external hardware (vs PIC18F442-I/P)
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD/VSS pair (pins 11/12 and 31/32 on the 40-PDIP). Add a bulk 10 uF tantalum or aluminum electrolytic capacitor at the board's 5 V regulator output. The PIC18F452-I/P draws up to 25 mA active at 40 MHz; ensure your regulator can supply at least 1.5x this for transient headroom. Avoid placing the MCU directly across noisy relay or motor traces.
Keep oscillator traces (OSC1 pin 13, OSC2 pin 14) short - under 1 cm - and shield with a ground ring. For crystal operation (HS mode), place load capacitors within 3 mm of the OSC pins; typical values are 15-33 pF for an 8-20 MHz crystal. Route the MCLR/VPP line (pin 1) with a 10 kohm pull-up to VDD and a 100 nF capacitor to ground for noise immunity and ICSP compatibility.
Configuration bits must be set correctly before the first instruction executes; an unprogrammed CONFIG block disables MCLR and may appear as a dead MCU. ADC acquisition time must allow the S/H capacitor to settle - use the recommended minimum Tacq per the datasheet, especially for high-impedance sources (>10 kohm). Finally, ensure I2C bus speeds match your pull-up resistor strength; the MSSP port requires external pull-ups of typically 4.7 kohm for 400 kHz Fast Mode.
When using the parallel slave port (PORTD, pins 19-22 and 27-30), keep bus traces short and add 100 ohm series terminators for cables longer than 5 cm. The USART lines (RC6/RC7, pins 25/26) benefit from ground isolation when running RS-485 at high baud rates. For noisy industrial environments, add ferrite beads on VDD and a TVS diode on the MCLR line to harden against ESD strikes.
Compliance Information
RoHS and lead-free compliant per Microchip product page. Not AEC-Q100 qualified - choose PIC18F452 automotive variants for vehicle applications. REACH compliance per Microchip environmental documentation.
