AT88SC0404CA-SU Equivalent & Substitute Parts

Part Overview

The AT88SC0404CA-SU is a Secure Memory IC manufactured by Microchip Technology in the CryptoMemory® series. This 8-SOIC surface mount device is designed for embedded and smart card applications requiring secure memory functionality. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates with unlimited moisture sensitivity level (MSL 1) and is ROHS3 compliant.

Key Parameters

Parameter	AT88SC0404CA-SU
Manufacturer	Microchip Technology
Product Type	Secure Memory
Series	CryptoMemory®
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Applications	Embedded, Smart Card
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the AT88SC0404CA-SU is determined by the following critical parameters:

Primary Substitution Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) form factor
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected
Moisture Sensitivity Level: 1 (Unlimited) preferred for equivalent reliability

Substitution Categories:

Category 1: Direct Microchip CryptoMemory® Substitutes These parts maintain the same secure memory architecture and series designation. AT88SC0404CA-SH is the direct active equivalent with identical electrical and mechanical specifications, differing only in packaging format (Tube vs. original packaging).

Category 2: Microchip EEPROM Memory Alternatives Parts AT24C04D-SSHM-B, AT24CS04-SSHM-T, and AT24HC04BN-SH-B are EEPROM-based memory ICs from Microchip Technology. These provide 4Kbit memory capacity with I2C interface in 8-SOIC packages. They serve as functional alternatives for applications requiring standard EEPROM memory rather than secure memory features. Key parameters include Memory Size (4Kbit), Memory Organization (512 x 8), I2C interface, and operating temperature range (-40°C to 85°C).

Category 3: Third-Party EEPROM Equivalents Parts from Rohm Semiconductor (BR24G04FJ-3AGTE2, BR24G04FJ-3GTE2, BR24T04FJ-WE2), Catalyst Semiconductor (CAT24C04WI-G), onsemi (CAV24C04WE-GT3), and Fremont Micro Devices (FT24C04A-USG-B) provide 4Kbit I2C EEPROM functionality in compatible 8-SOIC or equivalent packages. These parts are suitable for applications where secure memory features are not required and standard EEPROM performance is acceptable.

Parameter Comparison

Part Number	Manufacturer	Product Type	Package / Case	Memory Size	Interface	Clock Frequency	Voltage Supply	Operating Temp	Product Status	MSL	RoHS
AT88SC0404CA-SU	Microchip	Secure Memory	8-SOIC	N/A	N/A	N/A	N/A	N/A	Obsolete	1	ROHS3
AT88SC0404CA-SH	Microchip	Secure Memory	8-SOIC	N/A	N/A	N/A	N/A	N/A	Active	1	ROHS3
AT24C04D-SSHM-B	Microchip	EEPROM	8-SOIC	4Kbit	I2C	1 MHz	1.7V ~ 3.6V	-40°C ~ 85°C	Active	3	ROHS3
AT24CS04-SSHM-T	Microchip	EEPROM	8-SOIC	4Kbit	I2C	1 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	Active	1	ROHS3
AT24HC04BN-SH-B	Microchip	EEPROM	8-SOIC	4Kbit	I2C	1 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	Active	1	ROHS3
BR24G04FJ-3AGTE2	Rohm	EEPROM	8-SOP-J	4Kbit	I2C	1 MHz	1.6V ~ 5.5V	-40°C ~ 85°C	Active	1	ROHS3
BR24G04FJ-3GTE2	Rohm	EEPROM	8-SOP-J	4Kbit	I2C	400 kHz	1.6V ~ 5.5V	-40°C ~ 85°C	Active	1	ROHS3
BR24T04FJ-WE2	Rohm	EEPROM	8-SOP-J	4Kbit	I2C	400 kHz	1.6V ~ 5.5V	-40°C ~ 85°C	Active	1	ROHS3
CAT24C04WI-G	Catalyst	EEPROM	8-SOIC	4Kbit	I2C	400 kHz	1.7V ~ 5.5V	-40°C ~ 85°C	Active	3	ROHS3
CAV24C04WE-GT3	onsemi	EEPROM	8-SOIC	4Kbit	I2C	400 kHz	2.5V ~ 5.5V	-40°C ~ 125°C	Active	1	ROHS3
FT24C04A-USG-B	Fremont Micro	EEPROM	8-SOP	4Kbit	I2C	1 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	Active	1	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Secure Memory Function Required):

AT88SC0404CA-SH is the recommended direct substitute. This part maintains identical secure memory architecture within the CryptoMemory® series and is currently in active production status. Both parts share the same 8-SOIC package, surface mount configuration, MSL 1 rating, and ROHS3 compliance. The primary difference is packaging format (Tube). This substitution requires no design modification.

For EEPROM-Based Alternatives (When Secure Memory Features Are Not Required):

When secure memory functionality is not essential to the application, EEPROM-based alternatives provide cost-effective solutions with active product status and established supply chains.

Microchip EEPROM Options:

AT24CS04-SSHM-T and AT24HC04BN-SH-B are preferred within the Microchip ecosystem. Both maintain MSL 1 rating and ROHS3 compliance. AT24HC04BN-SH-B offers extended voltage range (1.8V ~ 5.5V) and is verified as programmable by DiGi-Electronics.
AT24C04D-SSHM-B provides 1 MHz clock frequency but has MSL 3 rating and narrower voltage range (1.7V ~ 3.6V).

Third-Party EEPROM Options:

CAV24C04WE-GT3 (onsemi) is qualified to AEC-Q100 automotive standard with extended operating temperature range (-40°C to 125°C), suitable for automotive and industrial applications.
BR24G04FJ-3GTE2 (Rohm) offers high inventory availability (58,185 pcs) with 400 kHz clock frequency and wide voltage range (1.6V ~ 5.5V).
CAT24C04WI-G (Catalyst) provides 400 kHz operation with 1.7V ~ 5.5V supply range and high inventory (116,890 pcs).
FT24C04A-USG-B (Fremont Micro) supports 1 MHz clock frequency with 1.8V ~ 5.5V supply range.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can AT88SC0404CA-SH directly replace AT88SC0404CA-SU without design changes?

A: Yes. AT88SC0404CA-SH is the direct active equivalent. Both parts are Microchip CryptoMemory® secure memory ICs in 8-SOIC packages with identical electrical specifications, MSL 1 rating, and ROHS3 compliance. The only difference is packaging format (Tube vs. original). No PCB or firmware modifications are required.

Q: What is the functional difference between the AT88SC0404CA-SU and EEPROM alternatives like AT24C04D-SSHM-B?

A: The AT88SC0404CA-SU is a secure memory device with cryptographic capabilities designed for smart card and embedded security applications. EEPROM alternatives provide standard non-volatile memory storage without security features. If your application requires secure memory functions (encryption, authentication, secure storage), only the CryptoMemory® series (AT88SC0404CA-SH) is suitable. If your application requires only standard data storage, EEPROM alternatives are functionally equivalent.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Most substitute parts are available in 8-SOIC or equivalent 8-SOP-J packages with identical 0.154" (3.90mm) width. BR24G04FJ series and FT24C04A-USG-B use 8-SOP-J designation, which is mechanically and electrically compatible with 8-SOIC for PCB mounting purposes. Verify package footprint compatibility with your PCB design before final selection.

Q: Which substitute part has the best supply availability?

A: CAT24C04WI-G (Catalyst Semiconductor) has the highest inventory at 116,890 pcs. BR24G04FJ-3GTE2 (Rohm) follows with 58,185 pcs. Both are actively produced and suitable for high-volume applications.

Q: What voltage range should I consider when selecting a substitute?

A: The original AT88SC0404CA-SU does not specify voltage range in the provided data. For EEPROM substitutes, consider your system's supply voltage:

Narrow range (1.7V ~ 3.6V): AT24C04D-SSHM-B (battery-powered, low-power applications)
Standard range (1.7V ~ 5.5V): AT24CS04-SSHM-T, CAT24C04WI-G, FT24C04A-USG-B
Wide range (1.6V ~ 5.5V): BR24G04FJ series (flexible supply requirements)
Extended range (1.8V ~ 5.5V): AT24HC04BN-SH-B, FT24C04A-USG-B
Automotive range (2.5V ~ 5.5V): CAV24C04WE-GT3

Q: Does clock frequency matter when selecting a substitute?

A: Clock frequency affects data transfer speed. The original AT88SC0404CA-SU does not specify clock frequency. EEPROM substitutes operate at either 400 kHz or 1 MHz. For most embedded and smart card applications, 400 kHz is sufficient. Select 1 MHz variants (AT24C04D-SSHM-B, AT24CS04-SSHM-T, AT24HC04BN-SH-B, BR24G04FJ-3AGTE2, FT24C04A-USG-B) if your application requires faster I2C communication.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting the same regulatory requirements as the original AT88SC0404CA-SU.

Q: Which substitute is recommended for automotive applications?

A: CAV24C04WE-GT3 (onsemi) is qualified to AEC-Q100 automotive standard with extended operating temperature range (-40°C to 125°C). This part is suitable for automotive and industrial environments requiring temperature stability beyond standard commercial grade (-40°C to 85°C).

Q: What is the significance of MSL (Moisture Sensitivity Level) rating?

A: MSL 1 (Unlimited) indicates the part can be stored indefinitely without moisture baking requirements before soldering. MSL 3 (168 Hours) requires moisture baking if the part has been exposed to humidity for more than 168 hours. For supply chain flexibility and reduced handling requirements, prefer MSL 1 parts: AT88SC0404CA-SH, AT24CS04-SSHM-T, AT24HC04BN-SH-B, BR24G04FJ series, CAV24C04WE-GT3, and FT24C04A-USG-B.

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