PIC18LC452-I/P - 32KB OTP 8-bit MCU, 40MHz, 40-PDIP | Microchip
MPN: PIC18LC452-I/P ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.15 | $515.00 |
| 500 | $4.62 | $2,310.00 |
| 1,000 | $4.1 | $4,100.00 |
PIC18LC452-I/P Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral interfaces on a single die. The PIC18 family belongs to the broader taxonomy of microcontrollers -> embedded controllers -> microprocessors -> semiconductors, and specifically targets high-performance 8-bit applications where deterministic timing, low power, and C-compiler optimized instruction sets are valued. The PIC18LC452 sits within Microchip's legacy PIC18C series of OTP-programmed devices, source-code compatible with PIC16C7X pinouts.
Key specifications include four 16-bit timer/counter modules (Timer0/1/2/3) with selectable prescaler, dual Capture/Compare/PWM (CCP) modules, a USART with addressable addressing, an SPI/I2C-compatible master/slave synchronous serial port, three external interrupt sources, and high-current 25 mA sink/source capability per I/O. An 8x8 hardware multiplier, 16-bit instructions, and a 31-level hardware stack support efficient C code generation.
The PIC18LC452 utilizes an enhanced Harvard architecture with separate program and data buses, an 8-bit data path, and 16-bit instructions. Its analog peripherals include a 10-bit ADC with up to 12 input channels, while digital peripherals include a Parallel Slave Port for external memory expansion and a programmable low-voltage detection (LVD) module. The OTP memory model suits prototyping and low-to-mid volume production where field firmware updates are not required.
Typical applications include industrial control logic, sensor signal conditioning, low-power data acquisition, motor control driver boards, and educational embedded platforms. Its wide operating voltage range supports both 3.3 V and 5 V rails commonly found in legacy industrial and consumer designs. The DIP-40 package enables easy breadboarding and hand-soldering for prototypes and hobbyist projects.
When designing with this device, choose the LC variant when battery operation is required; the standard PIC18C452 has a tighter voltage range. Ensure the MCLR reset circuit includes the recommended 10 kΩ pull-up and decoupling capacitor, and configure the CONFIG fuses during programming to lock peripheral features. This page synthesizes Microchip-anchored specifications, distributor pricing, and drop-in alternatives from the same PIC18 family not found on a single manufacturer page.
Drop-in alternatives for PIC18LC452-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 PIC18LC452-I/P (same form factor and footprint) — differing in ADC, Package, Operating Temperature, Timers, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F452-I/P
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →PIC18F45K22-I/P
✅ Drop-In✓ In Stock
$2.1 / Unit
View Datasheet →PIC18F458-E/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F4685-I/P
✅ Drop-In✓ In Stock
$5.4 / Unit
View Datasheet →PIC18F4620-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.45 / Unit
View Datasheet →PIC18F46K22-I/P
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.61 / Unit
View Datasheet →PIC18LC452-I/P Maximum Ratings & Electrical Characteristics
| Product Family | PIC18C Series (PIC18LC452) |
| Core Architecture | 8-bit RISC (PIC18 Harvard) |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 1536 bytes |
| Data EEPROM | Not present on OTP PIC18C452 family |
| Maximum CPU Frequency | 40 MHz |
| Instruction Cycle Time | 100 ns (10 MIPS) |
| Operating Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| Timers | Timer0 (8/16-bit), Timer1 (16-bit), Timer2 (8-bit), Timer3 (16-bit) |
| Capture/Compare/PWM | 2 CCP modules |
| Serial Interfaces | USART, SPI, I2C-compatible synchronous port |
| Package | 40-pin PDIP (0.600 in, 15.24 mm) |
| Mounting Type | Through-Hole |
| Operating Temperature | -40C to +85C (Industrial) |
| I/O Sink/Source Current | 25 mA / 25 mA |
| External Interrupts | 3 |
| RoHS Status | Compliant (lead-free) |
PIC18LC452-I/P Pin Configuration
| Pin 1 | MCLR — Master Clear (Reset) input, internal pull-up enabled by configuration |
| 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 / Parallel Slave Port Read / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / Parallel Slave Port Write / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / Parallel Slave Port Chip Select / Analog input 7 |
| Pin 11 | OSC2/CLKO/RA6 — Oscillator output / Clock output / PORTA bit 6 |
| Pin 12 | OSC1/CLKI/RA7 — Oscillator input / Clock input / PORTA bit 7 |
| Pin 13 | VSS — Ground reference |
| Pin 14 | VDD — Positive supply voltage (2.0 V to 5.5 V) |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| 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 transmit / USART clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART receive / USART 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 (2.0 V to 5.5 V) |
| 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 alternate pin |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5 — PORTB bit 5 |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP data |
Typical Applications
PIC18LC452-I/P is suitable for 6 applications: Industrial Control Logic, Low-Power Data Acquisition, Motor Control and PWM Driver Boards, Sensor Signal Conditioning Hub, Educational Embedded Platform, Legacy Embedded Upgrade Path.
Industrial Control Logic
The PIC18LC452-I/P fits industrial control logic boards because its 32 KB OTP program memory, 1536-byte RAM, and 40 MHz PIC18 core deliver 10 MIPS deterministic execution for state-machine control. The 34 digital I/O pins, 25 mA sink/source capability, and 2.0-5.5 V supply range support direct interfacing with 5 V relays, optocouplers, and 24 V PLC-style signal conditioning. Designers benefit from three external interrupts and four hardware timers for precise pulse counting and PWM generation in conveyor, motor start/stop, and process-control logic. The PDIP-40 package is well-suited to legacy factory equipment controllers where through-hole replacement simplifies field servicing.
Recommended
Low-Power Data Acquisition
The PIC18LC452-I/P suits low-power data acquisition front-ends thanks to its low-power CMOS (LC) process node that operates down to 2.0 V, plus its 10-bit ADC with up to 8 input channels. The 1536-byte RAM buffers sample streams for sensor logging, while the USART streams data out to a host MCU or wireless module. Compared to the standard PIC18C452, the LC variant draws substantially less quiescent current, making it a strong fit for battery-powered environmental monitors and portable instrumentation where deterministic 10 MIPS execution is needed for sample-rate management.
Recommended
Motor Control and PWM Driver Boards
The PIC18LC452-I/P is well-matched to small motor driver boards because its dual Capture/Compare/PWM (CCP) modules and four hardware timers generate complementary PWM waveforms for brushed DC, unipolar stepper, and small BLDC drivers. The 25 mA I/O sink/source capability directly drives logic-level FET gate drivers, while the 10 MIPS throughput sustains field-oriented control loops on small three-phase motors. The wide 2.0-5.5 V supply range supports both 3.3 V and 5 V driver rails, and the PDIP-40 package simplifies lab prototyping and hobbyist CNC / 3D-printer controller builds.
Recommended
Sensor Signal Conditioning Hub
The PIC18LC452-I/P operates as a sensor signal conditioning hub in multi-sensor systems because its 10-bit ADC with up to 8 input channels multiplexes analog signals from thermistors, RTDs, photocells, and strain gauges, while its SPI/I2C ports read digital sensors simultaneously. The 1536-byte RAM accommodates Kalman or moving-average filter state, and the 10 MIPS throughput runs the filter in real time before the USART streams results. Its 2.0 V minimum supply accommodates 3.3 V sensor rails, and the PIC18LC452's 25 mA I/O drive capability directly energizes sensor excitation circuits without external buffers.
Recommended
Educational Embedded Platform
The PIC18LC452-I/P remains a popular educational embedded platform because its 40-pin PDIP through-hole form factor accepts standard breadboards and is hand-solderable by students, while its PIC18 instruction set exposes advanced features like hardware multiply and a 31-level stack. With 32 KB OTP program memory and 1536-byte RAM, students can complete realistic C-compiler projects covering ADC, PWM, USART, and I2C peripherals. The 40 MHz clock supports real-time lab demonstrations, and the wide supply range simplifies 3.3 V / 5 V dual-rail labs. Migrating to the flash-based PIC18F452-I/P is straightforward when student projects require in-circuit reprogramming.
Recommended
Legacy Embedded Upgrade Path
The PIC18LC452-I/P serves legacy embedded products where PIC16C7X designs are being upgraded to the PIC18 architecture with code-compatible source. Per the datasheet, the 40-pin PDIP pinout is pin-compatible with PIC16C7X devices, allowing existing PCB layouts to be reused without re-spin. The OTP memory model suits single-program industrial products like vending machines, HVAC controllers, and security panels where firmware is factory-burned and never field-updated. Designers updating legacy PIC16C7X firmware to PIC18 gain higher 10 MIPS throughput, additional timers, and CCP modules while retaining the same I/O pin assignments.
Recommended
Recommended Products Summary
Engineering reference data for PIC18LC452-I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F452-I/P | PIC18F45K22-I/P | PIC18F458-E/P |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PDIP-40 | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same |
| Program Memory Type | OTP (32 KB) | Flash (32 KB) | Flash (32 KB) | Flash (32 KB) + 256 B EEPROM |
| RAM Size | 1536 bytes | 1536 bytes | 1536 bytes | 1536 bytes |
| Maximum CPU Frequency | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 64 MHz (16 MIPS) | 40 MHz (10 MIPS) |
| Operating Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 1.8 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 34 | 34 | 34 | 34 |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 28 channels | 10-bit, 8 channels |
| In-Circuit Reprogrammable | No (OTP) | Yes (flash) | Yes (flash) | Yes (flash) |
| Lifecycle Status | NRND | Active | Active | Active |
Key Differentiators
- Pin-compatible flash migration path (vs PIC18F452-I/P)
- Lower minimum operating voltage for battery designs (vs PIC18C452-I/P (non-LC))
- Higher MIPS and richer peripherals for future upgrades (vs PIC18F45K22-I/P)
Design Notes
The PIC18LC452-I/P operates from 2.0 V to 5.5 V; place a 100 nF decoupling capacitor as close as possible to each VDD pin (pins 14 and 32) and a bulk 10 uF tantalum or ceramic capacitor at the board power-entry. For battery-powered designs, take advantage of the LC process node's low quiescent current by using the SLEEP instruction with the Watchdog Timer and a low-power Timer1 oscillator on RA6/RA7 (T1OSI/T1OSO) to wake the MCU periodically. Estimated: at 3.3 V VDD with 10 MHz clock, active current is approximately 11 mA and SLEEP current is below 2 uA per the LC datasheet.
The PDIP-40 footprint accepts standard through-hole 0.600-inch-wide DIP sockets for development and hand-prototyping. Place a 10 kΩ pull-up resistor on MCLR (pin 1) and add a 100 nF capacitor from MCLR to VSS to filter reset noise; for ICSP programming, expose RB6/PGC (pin 39) and RB7/PGD (pin 40) on a 6-pin header per Microchip's ICSP specification. Keep the analog AVdd/AVss traces short and shielded if using the ADC; the VREF+ and VREF- pins (RA3/RA2) should be bypassed with 100 nF capacitors when an external reference is used.
Do not confuse PIC18LC452-I/P (OTP, low-power CMOS) with PIC18C452-I/P (non-LC OTP) or PIC18F452-I/P (flash). The LC suffix specifically denotes the 2.0 V minimum supply variant. Note that PIC18C452 family parts lack data EEPROM, so designers requiring non-volatile data storage must either use external I2C EEPROM (e.g., 24LC256) or migrate to the flash-based PIC18F45K22-I/P which has integrated EEPROM. Because the part is NRND as of 2026-09-28, new designs should default to the PIC18F452-I/P or PIC18F45K22-I/P unless OTP is a hard requirement.
Compliance Information
RoHS-compliant per Microchip product page; not AEC-Q100 qualified. Designed for industrial embedded applications rather than automotive safety-critical systems.
