23LCV1024-E/ST Equivalent & Substitute Parts

Part Overview

The 23LCV1024-E/ST is a 1Mbit Synchronous SRAM memory IC manufactured by Microchip Technology, featuring SPI Dual I/O interface capability. This device is designed for applications requiring volatile memory with SPI communication protocols and operates across an extended temperature range of -40°C to 125°C. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure long-term component availability for new production and legacy system support.

Key Parameters

Parameter	Value
Memory Type	Volatile SRAM
Memory Size	1Mbit
Memory Organization	128K x 8
Memory Interface	SPI - Dual I/O
Clock Frequency	20 MHz
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C (TA)
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 23LCV1024-E/ST is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Memory capacity: 1Mbit (128K x 8 organization)
Package type: 8-TSSOP surface mount form factor
Operating temperature range: -40°C to 125°C
Regulatory compliance: ROHS3 Compliant, REACH Unaffected

Interface Compatibility Consideration: The 23LCV1024-E/ST implements SPI Dual I/O interface. Substitute parts may feature enhanced SPI interface modes (such as Quad I/O) provided they maintain backward compatibility with Dual I/O operation and support the same memory organization and package specifications.

Voltage Supply Consideration: While the main part operates at 2.5V ~ 5.5V, substitute parts with different supply voltage ranges may be acceptable if the application's power supply architecture can accommodate the substitute's voltage requirements.

Parameter Comparison

Parameter	23LCV1024-E/ST (Main Part)	23A1024-E/ST (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Memory Type	Volatile SRAM	Volatile SRAM
Memory Size	1Mbit	1Mbit
Memory Organization	128K x 8	128K x 8
Memory Interface	SPI - Dual I/O	SPI - Quad I/O
Clock Frequency	20 MHz	16 MHz
Voltage Supply Range	2.5V ~ 5.5V	1.7V ~ 2.2V
Operating Temperature	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)
Package Type	8-TSSOP (0.173", 4.40mm Width)	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

The 23A1024-E/ST is the manufacturer-recommended substitute for the obsolete 23LCV1024-E/ST. Both devices are manufactured by Microchip Technology and share identical memory capacity, organization, and package specifications. The substitute maintains full ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original part.

Key differences requiring design consideration:

Voltage Supply Range: The 23A1024-E/ST operates at 1.7V ~ 2.2V, which is narrower than the original part's 2.5V ~ 5.5V range. System power supply architecture must be evaluated to confirm compatibility with the substitute's lower voltage requirements.

Clock Frequency: The substitute operates at 16 MHz compared to the original 20 MHz. Applications with timing-critical operations must confirm that the reduced clock frequency meets system performance requirements.

Interface Enhancement: The 23A1024-E/ST features SPI Quad I/O capability, providing enhanced data throughput potential while maintaining backward compatibility with Dual I/O operation modes.

Product Status: The substitute is active and in production, ensuring long-term availability and supply chain continuity compared to the obsolete status of the original part.

Frequently Asked Questions (FAQ)

Q: Can the 23A1024-E/ST directly replace the 23LCV1024-E/ST in existing designs?

A: Direct replacement requires evaluation of two critical factors: (1) the system's power supply voltage must operate within the 1.7V ~ 2.2V range specified for the substitute, and (2) the application's timing requirements must accommodate the 16 MHz clock frequency. If both conditions are met, the identical package, memory organization, and SPI interface compatibility enable direct substitution.

Q: What is the primary reason for substitution?

A: The 23LCV1024-E/ST is classified as obsolete. The 23A1024-E/ST is the active manufacturer-recommended alternative, ensuring continued component availability and supply chain support.

Q: Are there package compatibility concerns?

A: Both parts use the 8-TSSOP surface mount package with identical dimensions (0.173", 4.40mm width). PCB footprints and assembly processes require no modification.

Q: How do the voltage supply ranges differ, and what does this mean for system design?

A: The original part accepts 2.5V ~ 5.5V, while the substitute requires 1.7V ~ 2.2V. Systems designed for the original part's wider voltage range must be redesigned or use voltage regulation to operate the substitute within its specified range.

Q: Does the SPI Quad I/O interface on the substitute affect compatibility?

A: The Quad I/O capability is an enhancement that does not prevent Dual I/O operation. Existing firmware and hardware interfaces designed for Dual I/O will function with the substitute, though the enhanced Quad I/O mode remains available for future optimization.

Q: Are regulatory certifications maintained with the substitute?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, maintaining identical regulatory status.

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