PIC18LC452-I/P Equivalent & Substitute Parts

Part Overview

The PIC18LC452-I/P is an 8-bit microcontroller from Microchip Technology's PIC® 18C series, featuring 32KB OTP program memory, 1.5KB RAM, and 33 I/O pins. The device operates at 40MHz with integrated peripherals including PWM, watchdog timer, brown-out detection, and analog-to-digital conversion. Product status is Active with 1900 units in stock.

Substitute parts are identified when design requirements allow for alternative memory technologies, expanded I/O capabilities, or enhanced peripheral configurations while maintaining core functional compatibility within the 40-PDIP package format.

Substiute Parts

PIC18LC452-I/P

Microchip TechnologyIn Stock: 1963PIC18LC452-I/P Datasheet

Current PartRFQ

PIC18LF4520-I/P

Microchip TechnologyIn Stock: 1271PIC18LF4520-I/P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The PIC18LF4520-I/P qualifies as a direct substitute based on the following alignment criteria:

Matching Parameters:

• Core processor architecture (PIC)
• Core size (8-Bit)
• Operating speed (40MHz)
• Program memory capacity (32KB, 16K x 16)
• RAM size (1.5K x 8)
• Package format (40-PDIP)
• Operating temperature range (-40°C ~ 85°C)
• Mounting type (Through Hole)
• Supply voltage compatibility (2V ~ 5.5V encompasses 2.5V ~ 5.5V)
• Connectivity interfaces (I2C, SPI, UART/USART)
• RoHS and REACH compliance status

Functional Enhancements in Substitute:

• Program memory type upgraded from OTP to FLASH, enabling field reprogramming
• I/O count increased from 33 to 36 pins
• EEPROM added (256 x 8)
• Analog-to-digital converter expanded from 8x10-bit to 13x10-bit
• Oscillator capability expanded to include internal option

Parameter Comparison

Engineering Selection Recommendations

PIC18LC452-I/P is appropriate for applications requiring one-time programmable memory with fixed firmware, where reprogramming capability is not required and cost optimization for OTP technology is prioritized. Product status is Active with established supply availability.

PIC18LF4520-I/P is appropriate for applications requiring field-reprogrammable firmware, expanded I/O utilization (36 pins vs. 33), integrated EEPROM for data storage, or enhanced analog signal processing (13-channel vs. 8-channel ADC). The FLASH memory technology enables iterative development and in-system updates. Product status is Active. Both devices maintain identical RoHS3 and REACH compliance certifications.

Selection between these parts depends on whether the application requires reprogrammable memory and whether the additional I/O pins and EEPROM capacity provide functional value. Both devices are electrically and mechanically compatible within the 40-PDIP package footprint.

Frequently Asked Questions (FAQ)

Q: Can PIC18LF4520-I/P directly replace PIC18LC452-I/P in existing PCB designs?

A: Yes. Both devices use the 40-PDIP package with identical pin spacing (0.600", 15.24mm) and pinout compatibility. No PCB modifications are required. The substitute part provides additional I/O pins (36 vs. 33) and EEPROM capacity, which do not create conflicts in designs utilizing only the 33 I/O pins of the original part.

Q: What is the primary functional difference between these parts?

A: The main difference is program memory technology. PIC18LC452-I/P uses OTP (One-Time Programmable) memory, while PIC18LF4520-I/P uses FLASH memory, enabling field reprogramming. The substitute also includes 256 x 8 bytes of EEPROM and expanded analog-to-digital conversion capability (13 channels vs. 8 channels).

Q: Are the supply voltage ranges compatible?

A: Yes. PIC18LC452-I/P operates at 2.5V ~ 5.5V, while PIC18LF4520-I/P operates at 2V ~ 5.5V. The substitute part supports a wider lower voltage range, making it compatible with all applications designed for the original part's voltage specification.

Q: Do both parts support the same communication interfaces?

A: Yes. Both devices include I2C, SPI, and UART/USART connectivity. Firmware compatibility depends on application-specific implementation, but the hardware interfaces are functionally equivalent.

Q: What is the difference in oscillator configuration?

A: PIC18LC452-I/P requires an external oscillator, while PIC18LF4520-I/P supports both internal and external oscillator options. Applications using external oscillators with the original part remain compatible with the substitute.

Q: Are there compliance or certification differences?

A: Both parts maintain identical RoHS3 compliance and REACH Unaffected status. ECCN and HTSUS classifications are identical, indicating no regulatory differences for export or procurement purposes.