PIC18C452-E/P Equivalent & Substitute Parts

Part Overview

The PIC18C452-E/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 in a 40-PDIP package. 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 verified programmability through DiGi-Electronics.

Substitute parts become necessary when OTP (One-Time Programmable) memory limitations require reprogrammable alternatives, when higher I/O count is needed, or when EEPROM functionality is required for field updates.

Substiute Parts

PIC18C452-E/P

Microchip TechnologyIn Stock: 780PIC18C452-E/P Datasheet

Current PartRFQ

PIC18F4520-E/P

Microchip TechnologyIn Stock: 1119PIC18F4520-E/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The PIC18F4520-E/P qualifies as a direct substitute based on the following alignment criteria:

Matching Parameters:

• Core processor architecture (PIC 8-bit)
• Program memory capacity (32KB)
• Package form factor (40-DIP)
• Supply voltage range (4.2V ~ 5.5V)
• Operating temperature range (-40°C ~ 125°C)
• Connectivity interfaces (I2C, SPI, UART/USART)
• RoHS3 compliance
• Through-hole mounting

Substitution Logic: The PIC18F4520-E/P replaces the OTP-based PIC18C452-E/P with a FLASH-based alternative, enabling field reprogrammability while maintaining electrical and mechanical compatibility. Both devices share identical supply voltage specifications, temperature ratings, and package dimensions, allowing direct socket substitution in 40-DIP footprints.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility: The PIC18F4520-E/P is a valid substitute for the PIC18C452-E/P in applications where the following conditions are met:

• Maximum operating frequency requirement does not exceed 25MHz (PIC18F4520-E/P specification)
• FLASH reprogrammability is required or beneficial for field updates
• Additional I/O pins (36 vs. 33) and EEPROM storage (256 x 8 bytes) are compatible with system design
• Internal oscillator capability is acceptable, or external oscillator can be configured

Compliance Status: Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for industrial and commercial applications. Both are Active products with verified programmability through DiGi-Electronics.

Frequently Asked Questions (FAQ)

Q: Can the PIC18F4520-E/P directly replace the PIC18C452-E/P in existing PCB designs?

A: Yes, both devices use identical 40-DIP package dimensions (0.600", 15.24mm) and through-hole mounting, enabling direct socket substitution. Pin compatibility is maintained for core functionality. Verify that your application's maximum frequency requirement does not exceed 25MHz.

Q: What are the key differences between these microcontrollers?

A: The primary differences are program memory type (OTP vs. FLASH), maximum operating speed (40MHz vs. 25MHz), I/O pin count (33 vs. 36), EEPROM availability (none vs. 256 x 8), and oscillator type (external vs. internal). RAM size and supply voltage specifications are identical.

Q: Is the PIC18F4520-E/P suitable for applications requiring field reprogramming?

A: Yes. The FLASH-based program memory of the PIC18F4520-E/P supports in-circuit reprogramming, unlike the OTP-based PIC18C452-E/P. This enables firmware updates without component replacement.

Q: Are there any voltage or temperature compatibility concerns?

A: No. Both devices operate within identical supply voltage (4.2V ~ 5.5V) and temperature ranges (-40°C ~ 125°C), ensuring full electrical compatibility.

Q: What should be considered regarding the speed difference?

A: The PIC18F4520-E/P operates at a maximum of 25MHz compared to the PIC18C452-E/P's 40MHz. Applications requiring the full 40MHz performance cannot use the substitute without design modification.