PIC16C55-LPI/SO Equivalent & Substitute Parts

Part Overview

The PIC16C55-LPI/SO is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 768B of OTP (One-Time Programmable) memory and 20 I/O pins in a 28-SOIC surface mount package. This device is classified as Active product status and is RoHS3 compliant. Finding equivalent or substitute parts may be necessary due to inventory constraints, end-of-life considerations, or application-specific requirements for alternative memory types or performance characteristics.

Substiute Parts

PIC16C55-LPI/SO

Microchip TechnologyIn Stock: 836PIC16C55-LPI/SO Datasheet

Current PartRFQ

PIC16F57-I/SO

Microchip TechnologyIn Stock: 55458PIC16F57-I/SO Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC16C55-LPI/SO is determined by the following critical parameters:

• Package Compatibility: Both main and substitute parts must use the 28-SOIC surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.
• Core Architecture: Both parts must be PIC core 8-bit microcontrollers to maintain instruction set compatibility.
• I/O Pin Count: The substitute must provide 20 I/O pins to match the original pinout requirements.
• Voltage Supply Range: The substitute must operate within or encompass the supply voltage range of the original part.
• Operating Temperature Range: The substitute must support the same or wider operating temperature range.
• Memory Type Consideration: While the main part uses OTP memory, substitutes may employ FLASH memory, which provides reprogrammability and is functionally compatible for deployment scenarios.

The PIC16F57-I/SO qualifies as a direct substitute based on these parameters, despite differences in memory size and speed specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the PIC16C55-LPI/SO and PIC16F57-I/SO are Active product status devices from Microchip Technology, ensuring ongoing manufacturer support and availability. Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

The PIC16F57-I/SO provides increased program memory (3KB versus 768B) and RAM capacity (72 x 8 versus 24 x 8), offering greater flexibility for complex applications. The FLASH memory type enables field reprogramming, whereas the OTP memory of the original part is write-once. The PIC16F57-I/SO operates at a lower maximum speed (20MHz versus 40MHz) and has a slightly narrower supply voltage range (2V ~ 5.5V versus 2.5V ~ 6.25V), which should be verified against specific application requirements.

Selection between these parts depends on application-specific needs for memory capacity, reprogrammability, and performance characteristics within the defined operating parameters.

Frequently Asked Questions (FAQ)

Q: Can the PIC16F57-I/SO directly replace the PIC16C55-LPI/SO in existing designs?

A: Mechanical and electrical compatibility is ensured through identical 28-SOIC packaging, matching I/O pin count (20), and overlapping operating temperature ranges. However, differences in maximum speed (20MHz versus 40MHz) and supply voltage range (2V ~ 5.5V versus 2.5V ~ 6.25V) must be evaluated against specific circuit requirements.

Q: What are the key differences between OTP and FLASH memory types?

A: OTP (One-Time Programmable) memory cannot be erased or reprogrammed after initial programming. FLASH memory allows multiple program/erase cycles, enabling field updates and development flexibility. Both types are functionally compatible for deployment in fixed applications.

Q: Does the increased memory in the PIC16F57-I/SO affect pin compatibility?

A: No. Both parts maintain identical pinout and 28-SOIC package dimensions. The increased program memory (3KB) and RAM (72 x 8) do not impact physical or electrical pin compatibility.

Q: Are there supply voltage considerations when substituting these parts?

A: The PIC16C55-LPI/SO operates at 2.5V ~ 6.25V, while the PIC16F57-I/SO operates at 2V ~ 5.5V. Applications requiring operation below 2.5V or above 5.5V must use the original part. Applications within the 2.5V ~ 5.5V range are compatible with both parts.

Q: What compliance certifications apply to both parts?

A: Both parts are ROHS3 compliant, REACH unaffected, and carry Active product status from Microchip Technology, ensuring regulatory compliance and manufacturer support.