AT88SC0404CA-TH Equivalent & Substitute Parts

Part Overview

The AT88SC0404CA-TH is a Secure Memory IC manufactured by Microchip Technology in the CryptoMemory® series. This 8-TSSOP surface mount device provides 4Kbit secure memory functionality for embedded and smart card applications. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility while offering continued availability and support.

Key Parameters

Parameter	Value
Manufacturer Part Number	AT88SC0404CA-TH
Manufacturer	Microchip Technology
Product Type	Secure Memory IC
Memory Size	4Kbit
Memory Organization	512 x 8
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)
HTSUS Code	8542.32.0051

Substitute Part Grouping Explanation

Substitution of the AT88SC0404CA-TH is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-TSSOP (0.173", 4.40mm Width) surface mount package to ensure PCB layout and assembly compatibility.

Memory Capacity: Substitute parts must provide 4Kbit memory capacity with 512 x 8 organization to maintain functional equivalence.

Interface Standard: The original part operates as a secure memory device. Substitute parts identified are EEPROM memory ICs with I2C interface, which provide non-volatile memory storage in the same package footprint.

Electrical Characteristics: Operating temperature range of -40°C to 85°C is maintained across all substitutes. Supply voltage ranges vary by substitute part but all operate within industrial specifications.

Compliance Requirements: All substitute parts maintain ROHS3 compliance and EAR99 ECCN classification, ensuring regulatory alignment with the original component.

Parameter Comparison

Part Number	Manufacturer	Memory Type	Memory Size	Interface	Clock Frequency	Voltage Supply	Operating Temp	Package	Product Status	RoHS
AT88SC0404CA-TH	Microchip Technology	Secure Memory	4Kbit	Proprietary	N/A	N/A	-40°C ~ 85°C	8-TSSOP	Obsolete	ROHS3
AT24C04D-XHM-B	Microchip Technology	EEPROM	4Kbit	I2C	1 MHz	1.7V ~ 3.6V	-40°C ~ 85°C	8-TSSOP	Active	ROHS3
AT24CS04-XHM-T	Microchip Technology	EEPROM	4Kbit	I2C	1 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	ROHS3
AT24HC04B-TH-B	Microchip Technology	EEPROM	4Kbit	I2C	1 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	ROHS3
BR24G04FVT-3AGE2	Rohm Semiconductor	EEPROM	4Kbit	I2C	1 MHz	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	ROHS3
BR24G04FVT-3GE2	Rohm Semiconductor	EEPROM	4Kbit	I2C	400 kHz	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	ROHS3
BR24L04FVT-WE2	Rohm Semiconductor	EEPROM	4Kbit	I2C	400 kHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	ROHS3
BR24T04FVT-WE2	Rohm Semiconductor	EEPROM	4Kbit	I2C	400 kHz	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	ROHS3
CAT24C04YI-G	Catalyst Semiconductor Inc.	EEPROM	4Kbit	I2C	400 kHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	ROHS3
CAV24C04YE-GT3	onsemi	EEPROM	4Kbit	I2C	400 kHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active	ROHS3
M24C04-DRDW3TP/K	STMicroelectronics	EEPROM	4Kbit	I2C	1 MHz	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Microchip Technology):

AT24C04D-XHM-B, AT24CS04-XHM-T, and AT24HC04B-TH-B are direct Microchip alternatives maintaining the same manufacturer ecosystem. AT24CS04-XHM-T offers the widest supply voltage range (1.7V ~ 5.5V) and highest inventory availability (25,680 pcs). AT24HC04B-TH-B provides superior moisture sensitivity rating (MSL 1 vs. MSL 3) and verified programmability status.

Secondary Substitutes (Rohm Semiconductor):

BR24G04FVT-3AGE2 and BR24G04FVT-3GE2 provide active alternatives with extended voltage support (1.6V ~ 5.5V). BR24L04FVT-WE2 offers verified programmability and MSL 1 rating with 3,840 pcs inventory. BR24T04FVT-WE2 maintains 1.6V minimum supply voltage compatibility.

Automotive-Grade Substitute:

CAV24C04YE-GT3 (onsemi) is AEC-Q100 qualified with extended operating temperature range (-40°C ~ 125°C) and MSL 1 rating. This part is suitable for automotive and high-reliability applications with 29,300 pcs inventory.

High-Speed Substitute:

M24C04-DRDW3TP/K (STMicroelectronics) operates at 1 MHz clock frequency with 450 ns access time, matching the performance of AT24C04D-XHM-B. AEC-Q100 qualification and extended temperature range (-40°C ~ 125°C) support automotive applications.

Selection Criteria:

Choose substitutes based on: (1) required supply voltage range compatibility with system design, (2) clock frequency requirements (1 MHz for higher speed applications, 400 kHz for standard I2C), (3) moisture sensitivity level needs (MSL 1 for high-reliability applications), (4) operating temperature range (125°C maximum for automotive), (5) inventory availability and lead time requirements, (6) packaging format (Bulk, Tape & Reel, Tube, or Cut Tape).

Frequently Asked Questions (FAQ)

Q: Can AT24C04D-XHM-B directly replace AT88SC0404CA-TH?

A: AT24C04D-XHM-B shares the same 8-TSSOP package and 4Kbit memory capacity. However, the original part is a secure memory device while the substitute is a standard EEPROM with I2C interface. Functional compatibility depends on application requirements. Both maintain ROHS3 compliance and -40°C to 85°C operating range.

Q: What is the difference between 1 MHz and 400 kHz clock frequency options?

A: 1 MHz variants (AT24C04D-XHM-B, AT24CS04-XHM-T, AT24HC04B-TH-B, BR24G04FVT-3AGE2, M24C04-DRDW3TP/K) support faster I2C communication with 450 ns access time. 400 kHz variants (BR24G04FVT-3GE2, BR24L04FVT-WE2, BR24T04FVT-WE2, CAT24C04YI-G, CAV24C04YE-GT3) operate at standard I2C speed with 900 ns access time. Selection depends on system I2C bus speed requirements.

Q: Which substitute offers the best moisture sensitivity rating?

A: AT24HC04B-TH-B, BR24G04FVT-3AGE2, BR24G04FVT-3GE2, BR24L04FVT-WE2, BR24T04FVT-WE2, CAV24C04YE-GT3, and M24C04-DRDW3TP/K all provide MSL 1 (Unlimited) rating, superior to the original AT88SC0404CA-TH MSL 3 (168 Hours) specification.

Q: Are all substitutes available in Tape & Reel packaging?

A: Most substitutes are available in Tape & Reel format. AT24C04D-XHM-B is supplied in Bulk packaging. AT24HC04B-TH-B is supplied in Tube. Verify packaging format requirements before selection, as this affects assembly and handling procedures.

Q: Which substitute supports the widest supply voltage range?

A: AT24CS04-XHM-T, BR24G04FVT-3AGE2, BR24G04FVT-3GE2, BR24T04FVT-WE2, and M24C04-DRDW3TP/K all support 1.6V to 5.5V or 1.7V to 5.5V supply voltage ranges, providing maximum flexibility for multi-voltage system designs.

Q: Is CAV24C04YE-GT3 suitable for automotive applications?

A: Yes. CAV24C04YE-GT3 carries AEC-Q100 qualification and automotive grade designation. It operates across -40°C to 125°C temperature range with MSL 1 rating, meeting automotive reliability requirements.

Q: What is the inventory status of high-availability substitutes?

A: CAV24C04YE-GT3 (onsemi) offers the highest inventory with 29,300 pcs. AT24CS04-XHM-T (Microchip) provides 25,680 pcs. BR24L04FVT-WE2 (Rohm) stocks 3,840 pcs. These parts ensure supply continuity for production requirements.

Q: Can I use a 400 kHz part in a system designed for 1 MHz operation?

A: 400 kHz variants operate at standard I2C speed and are backward compatible with 1 MHz I2C buses, as I2C supports multiple clock speeds on the same bus. However, verify that system firmware and I2C controller support 400 kHz operation if this is the only available substitute.

Q: What compliance certifications apply to all substitutes?

A: All substitute parts maintain ROHS3 compliance and EAR99 ECCN classification. REACH status is either REACH Unaffected or Vendor Undefined across the substitute list. Verify specific REACH compliance requirements for your application jurisdiction.

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