PIC16C558-04E/SS Equivalent & Substitute Parts

Part Overview

The PIC16C558-04E/SS 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 and substitute parts becomes necessary when the original PIC16C558-04E/SS reaches end-of-life status, inventory constraints occur, or design requirements shift toward enhanced capabilities such as reprogrammable memory or higher processing speeds while maintaining pin compatibility and core functionality.

Substiute Parts

PIC16C558-04E/SS

Microchip TechnologyIn Stock: 976PIC16C558-04E/SS Datasheet

Current PartRFQ

PIC16F628A-E/SS

Microchip TechnologyIn Stock: 3828PIC16F628A-E/SS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC16C558-04E/SS is determined by the following critical parameters:

Core Compatibility Parameters:

• 8-Bit core processor (PIC architecture)
• 4.6KB (2K x 14) program memory capacity
• 20-SSOP package with identical pin count and physical dimensions
• Surface mount configuration
• Voltage supply range: 3V ~ 5.5V
• Operating temperature range: -40°C ~ 125°C

Allowable Variations:

• Program memory type may transition from OTP to FLASH (reprogrammable)
• Processing speed may increase beyond 4MHz
• RAM capacity may increase
• I/O count may increase
• Additional peripherals and connectivity options are permissible
• Oscillator type may change from external to internal

The PIC16F628A-E/SS qualifies as a direct substitute because it maintains identical package specifications, memory capacity, voltage supply range, operating temperature range, and core architecture while offering enhanced capabilities in memory type, speed, and peripheral integration.

Parameter Comparison

Engineering Selection Recommendations

Both the PIC16C558-04E/SS and PIC16F628A-E/SS maintain Active product status from Microchip Technology, ensuring continued availability and support. Both devices are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

The PIC16F628A-E/SS represents a forward-compatible substitute that maintains identical physical and electrical interface specifications while providing enhanced programmability through FLASH memory technology. This substitution is suitable for applications where reprogrammability is beneficial or where the original OTP-based design requires field updates.

Selection between these devices should be based on application requirements regarding memory reprogrammability, processing speed requirements, and I/O expansion needs. Both devices are verified as programmable through DiGi-Electronics and maintain identical package footprints for direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can the PIC16F628A-E/SS be used as a direct replacement for the PIC16C558-04E/SS in existing designs?

A: Yes. Both devices share identical 20-SSOP package dimensions, pin count, voltage supply range (3V ~ 5.5V), and operating temperature specifications (-40°C ~ 125°C). PCB footprints are directly compatible. Firmware compatibility depends on application-specific code; the PIC16F628A-E/SS supports higher clock speeds and additional peripherals that may require code modifications.

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

A: OTP (One-Time Programmable) memory in the PIC16C558-04E/SS allows single programming during manufacturing. FLASH memory in the PIC16F628A-E/SS permits multiple reprogramming cycles, enabling field updates and development flexibility.

Q: Does the increased I/O count (16 vs. 13) on the PIC16F628A-E/SS affect pin compatibility?

A: No. Both devices use the 20-SSOP package with identical pin assignments. The PIC16F628A-E/SS provides additional I/O functionality on pins that may be configured as general-purpose I/O or alternative functions, maintaining backward compatibility with designs using only the 13 I/O pins of the original device.

Q: Are there any compliance or certification differences between these parts?

A: Both devices are ROHS3 Compliant, REACH Unaffected, and classified as Active products. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for both, indicating no moisture sensitivity constraints during storage or handling.

Q: What is the impact of the 20MHz speed capability of the PIC16F628A-E/SS compared to the 4MHz specification of the PIC16C558-04E/SS?

A: The PIC16F628A-E/SS supports operation at speeds up to 20MHz, providing increased processing capability. Applications designed for 4MHz operation will function correctly at this speed; however, timing-critical code may require adjustment if higher clock frequencies are utilized.