PIC16C55-LPI/SP Equivalent & Substitute Parts

Part Overview

The PIC16C55-LPI/SP 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-SPDIP package. This device is classified as Active product status and is RoHS3 compliant. Finding equivalent or substitute parts becomes necessary when OTP memory limitations require higher program memory capacity, when FLASH reprogrammability is required for development cycles, or when inventory constraints necessitate alternative sourcing.

Substiute Parts

PIC16C55-LPI/SP

Microchip TechnologyIn Stock: 1119PIC16C55-LPI/SP Datasheet

Current PartRFQ

PIC16F57-I/SP

Microchip TechnologyIn Stock: 2114PIC16F57-I/SP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Core Processor Architecture: Must be PIC to maintain instruction set compatibility
• Core Size: Must remain 8-Bit for software and hardware interface compatibility
• Package Type: Must be 28-DIP (0.300", 7.62mm) for mechanical and electrical pin compatibility
• Number of I/O: Must provide minimum 20 I/O pins
• Mounting Type: Must be Through Hole to match PCB design requirements
• Voltage Supply Range: Must support the operating voltage range of the application
• Operating Temperature Range: Must support -40°C ~ 85°C minimum

The PIC16F57-I/SP qualifies as a substitute based on these parameters. While it differs in program memory type (FLASH vs. OTP) and capacity, it maintains identical package, I/O count, core architecture, and thermal specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the PIC16C55-LPI/SP and PIC16F57-I/SP are Active products from Microchip Technology and maintain ROHS3 compliance. Selection between these devices depends on application requirements:

PIC16C55-LPI/SP is appropriate for production applications where program code is finalized and OTP memory meets capacity requirements. The higher maximum speed (40MHz) and extended voltage range (2.5V ~ 6.25V) provide operational flexibility in demanding environments.

PIC16F57-I/SP is appropriate for applications requiring reprogrammable memory, development cycles with code iteration, or designs requiring greater program memory capacity (3KB vs. 768B). The FLASH memory type enables field updates and prototyping efficiency. Note that the maximum speed is 20MHz and the voltage range is 2V ~ 5.5V, which must be verified against application specifications.

Both devices are pin-compatible and maintain identical I/O count, peripheral set, and thermal operating range, enabling direct substitution at the PCB level when electrical specifications align.

Frequently Asked Questions (FAQ)

Q: Can PIC16F57-I/SP directly replace PIC16C55-LPI/SP on an existing PCB?

A: Yes, at the mechanical and electrical pin level. Both devices use the 28-DIP (0.300", 7.62mm) package with identical pinout and 20 I/O pins. However, verify that the application voltage supply range (2V ~ 5.5V for PIC16F57-I/SP vs. 2.5V ~ 6.25V for PIC16C55-LPI/SP) and maximum operating speed (20MHz vs. 40MHz) meet your design requirements.

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

A: The PIC16C55-LPI/SP uses OTP (One-Time Programmable) memory, while the PIC16F57-I/SP uses FLASH memory. OTP memory cannot be erased or reprogrammed after initial programming. FLASH memory is reprogrammable, making it suitable for development, testing, and field updates. Additionally, the PIC16F57-I/SP offers 3KB program memory compared to 768B in the PIC16C55-LPI/SP.

Q: Are there any speed or voltage considerations when substituting?

A: Yes. The PIC16C55-LPI/SP operates at up to 40MHz with a supply voltage range of 2.5V ~ 6.25V. The PIC16F57-I/SP operates at up to 20MHz with a supply voltage range of 2V ~ 5.5V. If your application requires operation above 20MHz or outside the 2V ~ 5.5V range, the PIC16F57-I/SP is not suitable.

Q: Do both parts have the same peripheral features?

A: Yes. Both devices include Power-On Reset (POR) and Watchdog Timer (WDT) peripherals. Both support external oscillator configuration and maintain identical I/O pin count (20 pins).

Q: What is the RAM difference between these parts?

A: The PIC16C55-LPI/SP has 24 x 8 bytes of RAM, while the PIC16F57-I/SP has 72 x 8 bytes of RAM. Applications requiring larger data storage capacity benefit from the increased RAM in the PIC16F57-I/SP.