IS31CS8969CA-ZNLS2 Equivalent & Substitute Parts

Part Overview

The IS31CS8969CA-ZNLS2 is an 8-bit microcontroller IC manufactured by Lumissil Microsystems, based on the 8051 core architecture. This device integrates 32KB of FLASH program memory, 1KB of RAM, and operates at 16MHz with a supply voltage range of 2.2V to 5.5V. The component is housed in a 24-TSSOP surface mount package and includes integrated peripherals such as PWM, WDT, LVD, LVR, and POR functions, along with I2C, LINbus, SPI, and UART/USART connectivity options.

The IS31CS8969CA-ZNLS2 is designated as Last Time Buy, indicating that this part number will no longer be manufactured. Identification of equivalent and substitute parts is necessary to ensure design continuity and support for new production runs or design revisions.

Substiute Parts

IS31CS8969CA-ZNLS2

Lumissil MicrosystemsIn Stock: 910IS31CS8969CA-ZNLS2 Datasheet

Current PartRFQ

IS31CS8977B-ZNLS2-TR

Lumissil MicrosystemsIn Stock: 975IS31CS8977B-ZNLS2-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IS31CS8969CA-ZNLS2 is determined by compatibility across the following critical parameters:

Mandatory Compatibility Criteria:

• Core processor architecture (8051)
• Package type (24-TSSOP surface mount)
• Operating temperature range (-40°C ~ 85°C)
• Supply voltage range overlap (minimum 2.2V ~ 5.5V)
• RoHS compliance status (ROHS3)

Allowable Variations:

• Program memory size (32KB or greater)
• RAM size (1KB or greater)
• Operating speed (16MHz or greater)
• Number of I/O pins (20 or greater)
• Data converter specifications (A/D and D/A channel count and resolution)
• Peripheral feature set (subset or superset of original)
• Connectivity options (subset or superset of original)
• Packaging format (Tube or Tape & Reel)

The IS31CS8977B-ZNLS2-TR qualifies as a substitute part based on these criteria. It maintains the same 8051 core architecture, 24-TSSOP package footprint, and operating temperature range. The substitute part offers enhanced specifications including doubled program memory (64KB), increased RAM (2KB), higher operating speed (32MHz), and additional I/O pins (28), all within the same physical package.

Parameter Comparison

Engineering Selection Recommendations

The IS31CS8977B-ZNLS2-TR is a qualified substitute for the IS31CS8969CA-ZNLS2 based on the following engineering criteria:

Compliance and Regulatory Status: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity in applications subject to environmental restrictions.

Product Lifecycle Considerations: The IS31CS8969CA-ZNLS2 is designated Last Time Buy, while the IS31CS8977B-ZNLS2-TR maintains Active product status. Selection of the substitute part ensures long-term availability and manufacturing support for ongoing production requirements.

Electrical and Functional Compatibility: The substitute part operates within the same temperature range (-40°C to 85°C) and maintains overlapping supply voltage specifications (2.3V to 5.5V). Both devices employ identical 8051 core architecture and 24-TSSOP package geometry, ensuring pin-compatible board-level integration.

Performance Enhancement: The IS31CS8977B-ZNLS2-TR provides increased program memory capacity (64KB versus 32KB), expanded RAM (2KB versus 1KB), and doubled operating frequency (32MHz versus 16MHz). These enhancements support more complex firmware implementations without requiring PCB redesign.

Packaging Format Difference: The substitute part is supplied in Tape & Reel format, whereas the original part is supplied in Tube format. This difference affects handling and assembly processes but does not impact electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the IS31CS8977B-ZNLS2-TR be used as a direct replacement for the IS31CS8969CA-ZNLS2 without PCB modifications?

A: Yes. Both parts utilize identical 24-TSSOP package geometry and pin assignments. No PCB layout changes are required for physical substitution. However, firmware may require recompilation to utilize the enhanced memory and speed capabilities of the substitute part.

Q: What are the key differences between these two microcontroller ICs?

A: The IS31CS8977B-ZNLS2-TR provides doubled program memory (64KB versus 32KB), doubled RAM (2KB versus 1KB), doubled operating speed (32MHz versus 16MHz), and increased I/O pin count (28 versus 20). Both parts share the same 8051 core architecture, package type, and operating temperature range.

Q: Are there connectivity differences between the two parts?

A: The IS31CS8969CA-ZNLS2 includes I2C, LINbus, SPI, and UART/USART connectivity. The IS31CS8977B-ZNLS2-TR includes I2C, SPI, and UART/USART connectivity. The substitute part does not include LINbus support. Applications requiring LINbus functionality must retain the original part number.

Q: What is the significance of the different packaging formats (Tube versus Tape & Reel)?

A: Tube packaging is used for lower-volume manual assembly operations, while Tape & Reel format is standard for automated pick-and-place assembly. The substitute part's Tape & Reel format is compatible with high-volume manufacturing processes. Component electrical and mechanical specifications remain identical regardless of packaging format.

Q: Does the substitute part support the same peripheral functions?

A: The IS31CS8969CA-ZNLS2 includes LVD, LVR, POR, PWM, and WDT peripherals. The IS31CS8977B-ZNLS2-TR includes DMA, PWM, and WDT peripherals. Applications dependent on LVD, LVR, or POR functions must evaluate the substitute part's feature set against specific design requirements.

Q: What is the minimum supply voltage requirement for each part?

A: The IS31CS8969CA-ZNLS2 operates from 2.2V minimum, while the IS31CS8977B-ZNLS2-TR operates from 2.3V minimum. Both parts support operation up to 5.5V. Applications operating below 2.3V must retain the original part number.

Q: Are both parts RoHS compliant?

A: Yes. Both the IS31CS8969CA-ZNLS2 and IS31CS8977B-ZNLS2-TR are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial and industrial applications.