AT88SC0204CA-SU Equivalent & Substitute Parts

Part Overview

The AT88SC0204CA-SU is a Secure Memory IC manufactured by Microchip Technology, classified as CryptoMemory® technology in an 8-SOIC surface mount package. This component is designated as Obsolete product status. The AT88SC0204CA-SU was designed for embedded and smart card applications requiring secure memory functionality. Due to its obsolete status, equivalent substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new production and legacy system support.

Key Parameters

Parameter	AT88SC0204CA-SU
Manufacturer	Microchip Technology
Product Type	Secure Memory
Series	CryptoMemory®
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Packaging Format	Tube
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS Code	8542.32.0051

Substitute Part Grouping Explanation

Substitution of the AT88SC0204CA-SU is based on strict alignment of the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility and assembly process continuity.

Mounting Technology: Surface mount technology is maintained across all substitutes to preserve manufacturing process requirements.

Compliance Standards: All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification, ensuring regulatory and export control alignment with the original component.

Moisture Sensitivity: Moisture Sensitivity Level 1 (Unlimited) is preserved in primary substitute recommendations, eliminating special storage and handling requirements.

Memory Interface and Organization: Substitute parts operate on I2C interface with 2Kbit memory capacity organized as 256 x 8 bits, maintaining functional equivalence for data storage and retrieval operations.

Electrical Operating Range: Supply voltage and temperature operating ranges are critical selection criteria. Substitutes are grouped by voltage compatibility (1.7V–5.5V, 1.8V–5.5V, or 2.5V–5.5V) and temperature range (-40°C to 85°C or -40°C to 125°C).

Product Status: Active product status ensures long-term availability and manufacturing support, contrasting with the obsolete status of the original part.

Parameter Comparison

Part Number	Manufacturer	Memory Type	Memory Size	Interface	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status	MSL
AT88SC0204CA-SU	Microchip	Secure Memory	N/A	N/A	N/A	N/A	N/A	N/A	8-SOIC	Obsolete	1
24AA02-I/SN	Microchip	EEPROM	2Kbit	I2C	400 kHz	900 ns	1.7V–5.5V	-40°C to 85°C	8-SOIC	Active	1
24AA024-I/SN	Microchip	EEPROM	2Kbit	I2C	400 kHz	900 ns	1.7V–5.5V	-40°C to 85°C	8-SOIC	Active	1
24AA024H-I/SN	Microchip	EEPROM	2Kbit	I2C	400 kHz	900 ns	1.7V–5.5V	-40°C to 85°C	8-SOIC	Active	1
24AA025-I/SN	Microchip	EEPROM	2Kbit	I2C	400 kHz	900 ns	1.7V–5.5V	-40°C to 85°C	8-SOIC	Active	1
24AA02H-I/SN	Microchip	EEPROM	2Kbit	I2C	400 kHz	900 ns	1.7V–5.5V	-40°C to 85°C	8-SOIC	Active	1
24AA52-I/SN	Microchip	EEPROM	2Kbit	I2C	400 kHz	900 ns	1.8V–5.5V	-40°C to 85°C	8-SOIC	Active	1
24LC024-E/SN	Microchip	EEPROM	2Kbit	I2C	400 kHz	900 ns	2.5V–5.5V	-40°C to 125°C	8-SOIC	Active	3
24LC024-I/SN	Microchip	EEPROM	2Kbit	I2C	400 kHz	900 ns	2.5V–5.5V	-40°C to 85°C	8-SOIC	Active	1
24LC024H-E/SN	Microchip	EEPROM	2Kbit	I2C	1 MHz	400 ns	2.5V–5.5V	-40°C to 125°C	8-SOIC	Active	1
24LC024H-I/SN	Microchip	EEPROM	2Kbit	I2C	1 MHz	400 ns	2.5V–5.5V	-40°C to 85°C	8-SOIC	Active	1

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The 24AA02-I/SN, 24AA024-I/SN, 24AA025-I/SN, and 24AA02H-I/SN are recommended as primary substitutes. These parts share identical electrical specifications with supply voltage range 1.7V–5.5V, operating temperature -40°C to 85°C, and Moisture Sensitivity Level 1. All are Active product status with verified or unverified programmability status. These parts maintain full compatibility with the original 8-SOIC package footprint and preserve all compliance certifications (ROHS3, REACH Unaffected, EAR99).

Secondary Substitutes (Extended Temperature Range):

The 24LC024-E/SN and 24LC024H-E/SN offer extended operating temperature to -40°C to 125°C, suitable for applications requiring higher temperature performance. The 24LC024-E/SN operates at 400 kHz with 900 ns access time, while 24LC024H-E/SN provides faster 1 MHz clock frequency with 400 ns access time. Note that 24LC024-E/SN has Moisture Sensitivity Level 3, requiring controlled storage conditions.

Tertiary Substitutes (Restricted Voltage Range):

The 24AA52-I/SN operates with minimum supply voltage of 1.8V (versus 1.7V for primary substitutes) and is suitable for applications where the lower voltage limit is not critical. The 24LC024-I/SN and 24LC024H-I/SN require minimum 2.5V supply voltage and are appropriate only for systems with higher voltage thresholds.

Selection Criteria:

Choose substitutes based on: (1) system supply voltage requirements; (2) operating temperature range; (3) required I2C clock frequency (400 kHz standard or 1 MHz for faster access); (4) moisture handling capability (MSL 1 preferred for unlimited storage); (5) long-term component availability (all recommended substitutes are Active status).

Frequently Asked Questions (FAQ)

Q: Why is the AT88SC0204CA-SU obsolete, and what are the implications?

A: The AT88SC0204CA-SU is classified as Obsolete by Microchip Technology, indicating it is no longer manufactured or supported. This status creates supply chain risk for new production and long-term system support. Active substitute parts ensure continued availability and manufacturing support for current and future applications.

Q: Are the substitute EEPROM parts functionally equivalent to the original Secure Memory part?

A: The substitute parts provide equivalent non-volatile memory storage with I2C interface and 2Kbit capacity. However, the original AT88SC0204CA-SU is classified as Secure Memory (CryptoMemory®), which may include security features not present in standard EEPROM substitutes. Application-specific security requirements must be evaluated independently.

Q: What is the significance of the 8-SOIC package specification?

A: The 8-SOIC (0.154", 3.90mm Width) package is a surface mount integrated circuit package with 8 pins. All substitute parts use this identical package, ensuring direct PCB footprint compatibility and eliminating the need for circuit board redesign or assembly process modification.

Q: How do I select between 400 kHz and 1 MHz I2C clock frequency options?

A: The 400 kHz variants (24AA02-I/SN, 24AA024-I/SN, 24AA025-I/SN, 24AA02H-I/SN, 24LC024-E/SN, 24LC024-I/SN) are standard I2C speed. The 1 MHz variants (24LC024H-E/SN, 24LC024H-I/SN) provide faster data access with 400 ns access time versus 900 ns. Select 1 MHz variants only if the application circuit and I2C bus are designed to support higher clock frequencies.

Q: What is Moisture Sensitivity Level (MSL), and why does it matter?

A: MSL indicates the maximum time a component can be exposed to ambient moisture before assembly. MSL 1 (Unlimited) allows indefinite storage without special conditions. MSL 3 (168 Hours) requires controlled storage environment. For production flexibility, MSL 1 parts are preferred unless extended temperature operation justifies MSL 3 selection.

Q: Can I use 24LC024 parts with 1.7V supply voltage?

A: No. The 24LC024-E/SN and 24LC024-I/SN require minimum 2.5V supply voltage. Use 24AA02-I/SN, 24AA024-I/SN, 24AA025-I/SN, or 24AA02H-I/SN for systems with 1.7V minimum supply. The 24AA52-I/SN requires minimum 1.8V.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 Compliant with REACH Unaffected status and EAR99 ECCN classification, matching the original AT88SC0204CA-SU compliance profile.

Q: What is the difference between 24AA024-I/SN and 24AA024H-I/SN?

A: Both parts are electrically identical with 2Kbit capacity, I2C 400 kHz interface, and 1.7V–5.5V supply range. The primary difference is DiGi-Electronics Programmable verification status: 24AA024-I/SN is Not Verified, while 24AA024H-I/SN is also Not Verified. Inventory levels differ (1,322 pcs vs. 1,611 pcs). Functional performance is equivalent.

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