PIC16LC558-04I/SO Equivalent & Substitute Parts

Part Overview

The PIC16LC558-04I/SO is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 4.6KB OTP program memory, 128 x 8 bytes of RAM, and 13 I/O pins. This device operates at 4MHz with an external oscillator and supports a supply voltage range of 2.5V to 5.5V. The part is currently active in production with verified programmability through DiGi-Electronics. Substitute parts are identified when equivalent functional requirements can be met through alternative microcontroller models that maintain core compatibility in package, memory architecture, and I/O configuration while potentially offering enhanced features or improved availability.

Substiute Parts

PIC16LC558-04I/SO

Microchip TechnologyIn Stock: 1060PIC16LC558-04I/SO Datasheet

Current PartRFQ

PIC16F628A-I/SO

Microchip TechnologyIn Stock: 55117PIC16F628A-I/SO Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PIC16LC558-04I/SO is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Identical package format: 18-SOIC (0.295", 7.50mm Width)
• Compatible core architecture: PIC 8-bit microcontroller
• Equivalent or greater program memory: 4.6KB (2K x 14) minimum
• Equivalent or greater RAM: 128 x 8 bytes minimum
• Equivalent or greater I/O pin count: 13 pins minimum
• Compatible supply voltage range: Must support operation within 2.5V ~ 5.5V envelope
• Identical operating temperature range: -40°C ~ 85°C (TA)
• RoHS3 compliance maintained

The PIC16F628A-I/SO qualifies as a direct substitute based on these parameters. While it introduces enhancements (FLASH memory instead of OTP, higher clock speed, additional I/O, and expanded RAM), these improvements do not preclude substitution in applications designed for the PIC16LC558-04I/SO, provided the application firmware is compatible with the enhanced instruction set and memory architecture of the PIC® 16F series.

Parameter Comparison

Engineering Selection Recommendations

Both the PIC16LC558-04I/SO and PIC16F628A-I/SO maintain active product status with ROHS3 compliance and REACH unaffected designation. The PIC16F628A-I/SO is the manufacturer-recommended substitute and offers superior programmability through FLASH memory technology, enabling field reprogramming without device replacement. This represents a significant advantage in development and production environments where firmware updates or corrections are required.

The PIC16F628A-I/SO's higher maximum clock speed (20MHz versus 4MHz) and expanded I/O count (16 versus 13) provide additional design flexibility without compromising backward compatibility at the package and core architecture level. The extended RAM (224 x 8 versus 128 x 8) and integrated EEPROM support more complex application requirements.

Selection between these parts should be based on application requirements for reprogrammability, clock speed, I/O count, and data retention needs. Both devices are suitable for equivalent functional replacement in 18-SOIC form factor applications requiring 8-bit PIC microcontroller architecture.

Frequently Asked Questions (FAQ)

Q: Can the PIC16F628A-I/SO directly replace the PIC16LC558-04I/SO in existing designs?

A: Yes, provided the application firmware is compatible with the PIC® 16F instruction set. Both devices share identical 18-SOIC packaging, equivalent program memory size, and compatible supply voltage ranges. Firmware developed for the PIC16LC558-04I/SO will execute on the PIC16F628A-I/SO without modification in most cases, though the enhanced capabilities of the PIC16F628A-I/SO may require firmware optimization to fully utilize additional I/O and memory resources.

Q: What is the primary advantage of the PIC16F628A-I/SO over the PIC16LC558-04I/SO?

A: The PIC16F628A-I/SO uses FLASH memory instead of OTP, enabling in-circuit reprogramming without device replacement. This eliminates the need for device destruction during firmware development and production testing cycles.

Q: Are there supply voltage compatibility concerns when substituting these parts?

A: The PIC16LC558-04I/SO operates from 2.5V to 5.5V, while the PIC16F628A-I/SO operates from 3V to 5.5V. Applications requiring operation below 3V must retain the PIC16LC558-04I/SO. For applications operating at 3V or above, both devices are compatible.

Q: Do both devices support the same package and pin configuration?

A: Yes. Both devices are supplied in 18-SOIC (0.295", 7.50mm Width) surface mount packages with identical physical dimensions and pin spacing, ensuring direct PCB compatibility.

Q: What is the difference in I/O pin availability?

A: The PIC16LC558-04I/SO provides 13 I/O pins, while the PIC16F628A-I/SO provides 16 I/O pins. Applications designed for 13 I/O pins will function with the PIC16F628A-I/SO, with three additional pins available for expanded functionality.