PIC16LC558-04I/P Equivalent & Substitute Parts

Part Overview

The PIC16LC558-04I/P 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 a supply voltage range of 2.5V to 5.5V and is housed in an 18-PDIP package. The product maintains Active status and is RoHS3 compliant. Substitute parts are identified when equivalent functional requirements can be met through alternative microcontroller architectures that maintain compatible pinout, package, and core electrical specifications while potentially offering enhanced capabilities or improved availability.

Substiute Parts

PIC16LC558-04I/P

Microchip TechnologyIn Stock: 1036PIC16LC558-04I/P Datasheet

Current PartRFQ

PIC16F628A-I/P

Microchip TechnologyIn Stock: 35210PIC16F628A-I/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The PIC16F628A-I/P qualifies as a substitute for the PIC16LC558-04I/P based on the following alignment of critical parameters:

• Core Processor Architecture: Both devices utilize the PIC core processor, ensuring instruction set compatibility
• Core Size: Both are 8-bit microcontrollers
• Program Memory Size: Both provide 4.6KB (2K x 14) program memory capacity
• Package Compatibility: Both are housed in 18-DIP (0.300", 7.62mm) through-hole packages with identical pinout
• Operating Temperature Range: Both support -40°C to 85°C operation
• Supply Voltage Overlap: PIC16F628A-I/P operates at 3V ~ 5.5V, which overlaps the upper range of the PIC16LC558-04I/P (2.5V ~ 5.5V)
• Compliance: Both are RoHS3 compliant and EAR99 classified

The substitution is valid for applications where the enhanced capabilities of the PIC16F628A-I/P (FLASH memory, higher speed, additional I/O, and internal oscillator) do not create design conflicts.

Parameter Comparison

Engineering Selection Recommendations

Both the PIC16LC558-04I/P and PIC16F628A-I/P maintain Active product status and full RoHS3 compliance, supporting long-term design viability. The PIC16F628A-I/P offers superior programmability through FLASH memory technology versus OTP, enabling field reprogramming and development flexibility. The substitute device provides increased RAM (224 x 8 versus 128 x 8), additional I/O pins (16 versus 13), and integrated EEPROM storage, along with higher clock speed capability (20MHz versus 4MHz). The minimum supply voltage requirement increases from 2.5V to 3V with the substitute. Both devices are classified as EAR99 and REACH Unaffected, maintaining equivalent regulatory standing. Selection between these parts depends on application requirements for reprogrammability, I/O count, processing speed, and minimum supply voltage constraints.

Frequently Asked Questions (FAQ)

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

A: Direct replacement is possible from a package and pinout perspective, as both devices use the 18-DIP (0.300", 7.62mm) through-hole package. However, design validation is required to confirm compatibility with application-specific requirements, particularly regarding minimum supply voltage (3V minimum for the substitute versus 2.5V for the original) and any dependencies on OTP versus FLASH memory characteristics.

Q: What are the key differences in memory technology between these devices?

A: The PIC16LC558-04I/P uses OTP (One-Time Programmable) memory, which is programmed once during manufacturing and cannot be reprogrammed. The PIC16F628A-I/P uses FLASH memory, which supports multiple programming cycles, enabling field updates and development iterations. The PIC16F628A-I/P also includes 128 x 8 bytes of EEPROM for non-volatile data storage, which the original device does not provide.

Q: Are there supply voltage compatibility concerns?

A: The PIC16LC558-04I/P operates from 2.5V to 5.5V, while the PIC16F628A-I/P operates from 3V to 5.5V. Applications requiring operation below 3V must retain the original device. For applications operating at 3V or higher, the substitute is voltage-compatible within the overlapping range.

Q: How do the I/O pin counts compare?

A: The PIC16LC558-04I/P provides 13 I/O pins, while the PIC16F628A-I/P provides 16 I/O pins. Both devices are housed in the same 18-DIP package. The additional I/O capability of the substitute may benefit designs requiring expanded digital interface capacity.

Q: What is the significance of the oscillator type difference?

A: The PIC16LC558-04I/P requires an external oscillator circuit, while the PIC16F628A-I/P includes an internal oscillator option. This reduces component count and board space for designs using the substitute, though external oscillator operation remains available if required for timing precision.