IS31CS8969BA-ZNLS2 Equivalent & Substitute Parts

Part Overview

The IS31CS8969BA-ZNLS2 is an 8-bit microcontroller IC manufactured by Lumissil Microsystems, featuring a 16MHz 8051 core processor with 32KB FLASH program memory. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The part is housed in a 20-TSSOP surface mount package and operates across a supply voltage range of 2.2V to 5.5V with an operating temperature range of -40°C to 85°C.

Due to Last Time Buy status, identifying equivalent substitute parts with compatible electrical and mechanical specifications is essential for design continuity and long-term component sourcing strategy.

Substiute Parts

IS31CS8969BA-ZNLS2

Lumissil MicrosystemsIn Stock: 1202IS31CS8969BA-ZNLS2 Datasheet

Current PartRFQ

IS31CS8977C-ZNLS2-TR

Lumissil MicrosystemsIn Stock: 1024IS31CS8977C-ZNLS2-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IS31CS8969BA-ZNLS2 is determined by the following critical parameters:

Core Architecture Compatibility: Both the main part and substitute must utilize the 8051 core processor architecture to ensure firmware compatibility and instruction set alignment.

Mounting and Package Compatibility: The 20-TSSOP package form factor is a primary constraint. The substitute IS31CS8977C-ZNLS2-TR utilizes a 20-eTSSOP package (exposed pad variant), which maintains mechanical and electrical compatibility with 20-TSSOP footprints while providing enhanced thermal performance.

Voltage Supply Range: The substitute must operate within or encompass the original supply voltage specification. The IS31CS8977C-ZNLS2-TR operates at 2.3V to 5.5V, which overlaps the original 2.2V to 5.5V range with a 0.1V minimum offset.

Operating Temperature Range: Both parts maintain identical operating temperature specifications of -40°C to 85°C, ensuring thermal compatibility across all application environments.

Compliance and Certification: Both parts maintain ROHS3 compliance, REACH unaffected status, and identical MSL 3 moisture sensitivity levels, ensuring regulatory and environmental compatibility.

Enhanced Specifications: The substitute part provides increased program memory (64KB versus 32KB), higher clock speed (32MHz versus 16MHz), and expanded I/O count (28 versus 16), offering design flexibility for future requirements while maintaining backward compatibility with the original 8051 instruction set.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The IS31CS8969BA-ZNLS2 carries Last Time Buy status, indicating end-of-life production. The IS31CS8977C-ZNLS2-TR maintains Active product status, ensuring continued availability and long-term supply chain stability.

Compliance Alignment: Both parts maintain identical RoHS3 compliance and REACH unaffected status, ensuring regulatory requirements are met without modification to design documentation or certification processes.

Moisture Sensitivity Equivalence: Both parts carry MSL 3 rating with 168-hour floor life, permitting identical handling, storage, and assembly procedures without additional process modifications.

Package Compatibility: The 20-eTSSOP package of the substitute part is mechanically and electrically compatible with 20-TSSOP PCB footprints. The exposed pad variant provides improved thermal dissipation characteristics, beneficial for applications requiring enhanced heat management.

Architectural Continuity: Both parts utilize the 8051 core processor, ensuring firmware compatibility without code modification or recompilation requirements.

Supply Chain Viability: Selection of the IS31CS8977C-ZNLS2-TR eliminates obsolescence risk associated with Last Time Buy inventory constraints while providing enhanced performance specifications within the same architectural family.

Frequently Asked Questions (FAQ)

Q: Can the IS31CS8977C-ZNLS2-TR directly replace the IS31CS8969BA-ZNLS2 in existing designs?

A: Yes. Both parts utilize the 8051 core processor architecture, operate across overlapping voltage supply ranges, maintain identical operating temperature specifications, and are housed in mechanically compatible 20-TSSOP/20-eTSSOP packages. No PCB redesign is required. Firmware compatibility is maintained due to identical instruction set architecture.

Q: What is the difference between 20-TSSOP and 20-eTSSOP packaging?

A: The 20-eTSSOP variant includes an exposed thermal pad on the package underside, providing enhanced heat dissipation compared to standard 20-TSSOP. Both packages maintain identical pin pitch, lead count, and footprint dimensions, ensuring direct PCB compatibility.

Q: Does the higher clock speed of the substitute part (32MHz versus 16MHz) require firmware modifications?

A: No firmware modifications are required. The 8051 instruction set remains identical across both parts. The higher clock speed of the IS31CS8977C-ZNLS2-TR provides improved execution performance without altering instruction compatibility or timing-critical code behavior, provided that timing-dependent peripheral configurations are appropriately adjusted for the application.

Q: Are there connectivity differences between the two parts?

A: The main part includes LINbus connectivity, which is not listed for the substitute part. The substitute part includes DMA (Direct Memory Access) functionality, which is not present in the main part. Both parts support I2C, SPI, and UART/USART connectivity. Application requirements for LINbus functionality must be evaluated independently.

Q: What is the significance of the Last Time Buy status for the IS31CS8969BA-ZNLS2?

A: Last Time Buy status indicates that the manufacturer has discontinued production and will not accept new orders beyond a specified cutoff date. Existing inventory is limited. Transition to the IS31CS8977C-ZNLS2-TR is recommended to ensure long-term component availability and supply chain continuity.

Q: Are the data converter specifications compatible between the two parts?

A: The data converter specifications differ. The main part includes 16x12-bit SAR A/D converters and 1x10-bit D/A converters. The substitute part includes 4x12-bit SAR A/D converters and 1x8-bit D/A converters. Applications requiring specific analog conversion capabilities must evaluate these differences against design requirements.

Q: What is the inventory status of each part?

A: The IS31CS8969BA-ZNLS2 has 1122 pieces in stock with Last Time Buy status. The IS31CS8977C-ZNLS2-TR has 938 pieces in stock with Active product status. Active status ensures continued manufacturing and replenishment availability.

Q: Do both parts require identical handling and storage procedures?

A: Yes. Both parts carry MSL 3 moisture sensitivity rating with 168-hour floor life, requiring identical moisture control, storage temperature, and handling procedures. No process modifications are necessary when transitioning between parts.