PIC18C452-I/P Equivalent & Substitute Parts

Part Overview

The PIC18C452-I/P is an 8-bit microcontroller from Microchip Technology's PIC® 18C series, featuring 32KB OTP (One-Time Programmable) memory, 40MHz operation, and comprehensive peripheral support including I2C, SPI, and UART connectivity. The product is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The transition to active, modern alternatives ensures continued availability and access to enhanced features while maintaining core functional compatibility.

Substiute Parts

PIC18C452-I/P

Microchip TechnologyIn Stock: 2086PIC18C452-I/P Datasheet

Current PartRFQ

PIC18F4520-I/P

Microchip TechnologyIn Stock: 3904PIC18F4520-I/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC18C452-I/P is based on the following critical parameters that must remain consistent:

• Core Processor Architecture: PIC processor family
• Core Size: 8-Bit processing capability
• Operating Speed: 40MHz maximum frequency
• Program Memory Capacity: 32KB (16K x 16) minimum
• RAM Size: 1.5K x 8 minimum
• Supply Voltage Range: 4.2V ~ 5.5V compatibility
• Connectivity Interfaces: I2C, SPI, UART/USART support
• Package Format: 40-DIP through-hole mounting
• Operating Temperature Range: -40°C ~ 85°C

The PIC18F4520-I/P qualifies as a direct substitute by meeting all critical parameters while offering enhanced features including FLASH memory (reprogrammable), increased I/O count, and expanded data converter capability.

Parameter Comparison

Engineering Selection Recommendations

The PIC18F4520-I/P is the qualified substitute for the PIC18C452-I/P based on the following engineering criteria:

Functional Equivalence: Both devices maintain identical core architecture, processing speed, memory capacity, supply voltage range, and package format, ensuring direct pin-compatible replacement in existing PCB designs.

Product Status Advantage: The PIC18F4520-I/P holds active product status with confirmed inventory availability (3840 Pcs), whereas the PIC18C452-I/P is obsolete. This transition eliminates supply chain risk and ensures long-term component availability.

Compliance Certification: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and manufacturing operations.

Enhanced Capabilities: The substitute provides FLASH memory (reprogrammable versus one-time programmable), 3 additional I/O pins, and expanded analog-to-digital converter channels (13x10b versus 8x10b), delivering improved design flexibility without compromising backward compatibility.

Packaging and Thermal Specifications: Identical 40-DIP through-hole package and operating temperature range (-40°C ~ 85°C) ensure mechanical and thermal interchangeability.

Frequently Asked Questions (FAQ)

Q: Is the PIC18F4520-I/P a direct pin-compatible replacement for the PIC18C452-I/P?

A: Yes. Both devices use the 40-DIP package with identical pinout and electrical specifications for core functions. The PIC18F4520-I/P provides 3 additional I/O pins (36 versus 33), which are available on the same package without affecting existing pin assignments.

Q: What is the primary difference between OTP and FLASH memory in these devices?

A: The PIC18C452-I/P uses OTP (One-Time Programmable) memory, which can be programmed once during manufacturing. The PIC18F4520-I/P uses FLASH memory, which is reprogrammable, allowing firmware updates and modifications throughout the product lifecycle.

Q: Are the supply voltage requirements identical?

A: Yes. Both the PIC18C452-I/P and PIC18F4520-I/P operate within the 4.2V ~ 5.5V supply voltage range, ensuring compatibility with existing power supply designs.

Q: Can I use the PIC18F4520-I/P in applications requiring the exact I/O count of the PIC18C452-I/P?

A: Yes. The PIC18F4520-I/P provides 36 I/O pins compared to 33 on the original device. Existing designs using 33 I/O pins will function without modification, with 3 additional pins available for future expansion.

Q: What is the impact of the enhanced analog-to-digital converter on compatibility?

A: The increased A/D converter channels (13x10b versus 8x10b) represent an enhancement that does not affect existing designs. Applications using 8 A/D channels will continue to operate identically, with 5 additional channels available if needed.

Q: Are both devices suitable for the same operating temperature range?

A: Yes. Both the PIC18C452-I/P and PIC18F4520-I/P are rated for -40°C ~ 85°C operating temperature, ensuring thermal compatibility across industrial and commercial applications.

Q: What is the inventory status for the substitute part?

A: The PIC18F4520-I/P has 3840 Pcs of new original stock available, compared to the obsolete status of the PIC18C452-I/P, ensuring reliable supply for production requirements.