PIC16C558-04I/P Equivalent & Substitute Parts

Part Overview

The PIC16C558-04I/P is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 4.6KB OTP (One-Time Programmable) memory and operating at 4MHz. This device is classified as Active product status and is suitable for embedded applications requiring basic microcontroller functionality with external oscillator support. Finding equivalent or substitute parts becomes necessary when OTP memory limitations require reprogrammable alternatives, when higher performance specifications are needed, or when inventory constraints affect project timelines.

Substiute Parts

PIC16C558-04I/P

Microchip TechnologyIn Stock: 832PIC16C558-04I/P Datasheet

Current PartRFQ

PIC16F628A-I/P

Microchip TechnologyIn Stock: 35210PIC16F628A-I/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC16C558-04I/P is determined by the following critical parameters:

Core Compatibility: Both main and substitute parts must use the PIC core processor architecture to ensure instruction set compatibility.

Memory Architecture: The substitute must maintain the same program memory size (4.6KB / 2K x 14) to preserve code capacity. However, substitutes may employ FLASH memory instead of OTP, providing reprogrammability without sacrificing storage capacity.

Electrical Specifications: Voltage supply range (3V ~ 5.5V) and operating temperature range (-40°C ~ 85°C) must be maintained or exceeded to ensure functional compatibility in existing circuit designs.

Physical Form Factor: The 18-DIP package with 0.300" (7.62mm) pitch is mandatory for direct pin-compatible replacement without PCB redesign.

I/O Pin Count: The substitute must provide equal or greater I/O capability to support existing peripheral connections.

Parameter Comparison

Engineering Selection Recommendations

The PIC16F628A-I/P qualifies as a direct substitute for the PIC16C558-04I/P based on the following engineering criteria:

Pin Compatibility: Both devices utilize the 18-DIP package with identical 0.300" (7.62mm) pitch, enabling direct socket replacement without PCB modification.

Electrical Compatibility: Both parts operate within the identical voltage supply range (3V ~ 5.5V) and temperature range (-40°C ~ 85°C), ensuring functional operation in existing circuit environments.

Memory Capacity: Program memory size remains constant at 4.6KB (2K x 14), preserving code capacity for firmware migration.

Compliance Status: Both parts maintain Active product status, ROHS3 compliance, and REACH Unaffected designation, meeting current regulatory and environmental standards.

Enhanced Capabilities: The PIC16F628A-I/P provides FLASH memory (reprogrammable) instead of OTP, increased RAM (224 x 8 vs. 128 x 8), integrated EEPROM (128 x 8), three additional I/O pins (16 vs. 13), and higher clock speed (20MHz vs. 4MHz), offering superior functionality without sacrificing compatibility.

Frequently Asked Questions (FAQ)

Q: Can the PIC16F628A-I/P directly replace the PIC16C558-04I/P without PCB changes?

A: Yes. Both devices share the 18-DIP package with identical pin pitch (0.300" / 7.62mm) and pinout compatibility, allowing direct socket replacement without PCB redesign.

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

A: The main difference is memory type. The PIC16C558-04I/P uses OTP (One-Time Programmable) memory, while the PIC16F628A-I/P uses FLASH memory, which is electrically erasable and reprogrammable. This allows the substitute to be reprogrammed multiple times during development and production.

Q: Are the voltage and temperature specifications identical?

A: Yes. Both parts operate at 3V ~ 5.5V supply voltage and -40°C ~ 85°C operating temperature, ensuring equivalent electrical performance in the same circuit environment.

Q: Does the PIC16F628A-I/P have sufficient memory for code originally written for the PIC16C558-04I/P?

A: Yes. Program memory capacity is identical at 4.6KB (2K x 14). The substitute additionally provides 128 x 8 bytes of EEPROM and increased RAM (224 x 8 vs. 128 x 8), offering additional storage without reducing available program space.

Q: What are the additional I/O pins on the PIC16F628A-I/P used for?

A: The PIC16F628A-I/P provides 16 I/O pins compared to 13 on the PIC16C558-04I/P. The three additional pins expand peripheral connection capability. Unused pins can be left unconnected in applications requiring only 13 I/O lines.

Q: Is the higher clock speed (20MHz vs. 4MHz) a concern for compatibility?

A: No. The higher speed of the PIC16F628A-I/P is a performance enhancement. Code written for 4MHz operation will execute correctly at 20MHz. If timing-critical applications require the original 4MHz speed, the substitute can be configured to operate at lower clock frequencies through firmware or oscillator selection.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both the PIC16C558-04I/P and PIC16F628A-I/P are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.