PIC16LC55AT-04I/SO Equivalent & Substitute Parts

Part Overview

The PIC16LC55AT-04I/SO is an 8-bit microcontroller from Microchip Technology's PIC® 16C series, featuring 768B of OTP (One-Time Programmable) memory and operating at 4MHz. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, redesigns, and production continuity. The part is housed in a 28-SOIC surface mount package and operates across an extended temperature range of -40°C to 85°C with a supply voltage range of 2.5V to 5.5V.

Substiute Parts

PIC16LC55AT-04I/SO

Microchip TechnologyIn Stock: 1086PIC16LC55AT-04I/SO Datasheet

Current PartRFQ

PIC16LC55A-04I/SO

Microchip TechnologyIn Stock: 958PIC16LC55A-04I/SO Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the PIC16LC55AT-04I/SO is determined by strict alignment of the following critical parameters:

• Core Architecture: PIC 8-bit processor
• Memory Configuration: 768B OTP program memory (512 x 12 organization)
• RAM Capacity: 25 x 8 bytes
• I/O Count: 20 pins
• Operating Frequency: 4MHz
• Supply Voltage Range: 2.5V ~ 5.5V
• Temperature Range: -40°C ~ 85°C
• Package Type: 28-SOIC form factor
• Peripherals: POR (Power-On Reset) and WDT (Watchdog Timer)

The identified substitute, PIC16LC55A-04I/SO, maintains identical electrical and mechanical specifications across all parameters listed above. The primary distinction is product status: the substitute is classified as active, whereas the original part is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The PIC16LC55A-04I/SO is the direct functional equivalent of the PIC16LC55AT-04I/SO. Both devices are ROHS3 compliant and maintain identical electrical, mechanical, and performance characteristics. The substitute part is currently in active production status, whereas the original is obsolete. For new designs, production restarts, or component replenishment, the PIC16LC55A-04I/SO is the appropriate selection. Both parts are suitable for applications requiring low-power 8-bit microcontroller functionality with OTP memory in space-constrained surface mount implementations.

Frequently Asked Questions (FAQ)

Q: Can PIC16LC55A-04I/SO be used as a direct replacement for PIC16LC55AT-04I/SO?

A: Yes. Both parts share identical core processor architecture, memory configuration, I/O count, operating frequency, supply voltage range, temperature range, package type, and peripheral set. No circuit modifications are required.

Q: What is the significance of the product status difference?

A: The original part (PIC16LC55AT-04I/SO) is classified as obsolete, indicating it is no longer in active production. The substitute (PIC16LC55A-04I/SO) is active, ensuring ongoing availability and manufacturing support.

Q: Are there any package compatibility concerns?

A: No. Both parts use the 28-SOIC surface mount package with identical dimensions (0.295", 7.50mm width). PCB footprints and assembly processes are interchangeable.

Q: Do compliance certifications differ between the two parts?

A: No. Both parts maintain ROHS3 compliance, REACH unaffected status, and identical EAR99 and HTSUS classifications.

Q: What memory organization should be considered for application compatibility?

A: Both parts feature 768B of OTP program memory organized as 512 x 12 bits, with 25 x 8 bytes of RAM. Application code and data structures must align with this memory architecture in both cases.