AT88SC0404CA-TH-T Equivalent & Substitute Parts

Part Overview

The AT88SC0404CA-TH-T is a Secure Memory IC manufactured by Microchip Technology in the CryptoMemory® series. This 8-TSSOP surface mount device is designed for embedded and smart card applications requiring secure memory functionality. The part is currently obsolete, necessitating identification of functionally compatible alternatives. Substitute parts in this reference are selected based on matching memory capacity, interface protocol, package form factor, and electrical operating parameters.

Key Parameters

Parameter	AT88SC0404CA-TH-T
Manufacturer	Microchip Technology
Memory Type	Secure Memory
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Applications	Embedded, Smart Card
Part Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the AT88SC0404CA-TH-T is based on the following criteria derived from the provided parameters:

Primary Matching Criteria:

Package / Case: 8-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
Memory Organization: 512 x 8 (4Kbit total)
Memory Interface: I2C
Memory Format: EEPROM (non-volatile)
Operating Temperature Range: -40°C ~ 85°C minimum
RoHS3 Compliance
REACH Unaffected Status

Secondary Compatibility Factors:

Supply Voltage Range (minimum 1.7V support)
Write Cycle Time: 5ms
Product Status: Active preferred for long-term availability

The substitute parts listed are EEPROM memory devices that match the 4Kbit capacity and I2C interface of the original secure memory device. All substitutes maintain the 8-TSSOP package and surface mount configuration. Differences in clock frequency, access time, and voltage ranges are noted in the parameter comparison table below.

Parameter Comparison

Parameter	AT88SC0404CA-TH-T	AT24C04D-XHM-T	AT24CS04-XHM-T	AT24HC04B-TH-T	BR24G04FVT-3AGE2	BR24G04FVT-3GE2	BR24L04FVT-WE2	BR24T04FVT-WE2	CAT24C04YI-GT3	CAV24C04YE-GT3	M24C04-DRDW3TP/K
Manufacturer	Microchip	Microchip	Microchip	Microchip	Rohm	Rohm	Rohm	Rohm	onsemi	onsemi	STMicroelectronics
Memory Size	Secure Memory	4Kbit EEPROM	4Kbit EEPROM	4Kbit EEPROM	4Kbit EEPROM	4Kbit EEPROM	4Kbit EEPROM	4Kbit EEPROM	4Kbit EEPROM	4Kbit EEPROM	4Kbit EEPROM
Memory Organization	Not specified	512 x 8	512 x 8	512 x 8	512 x 8	512 x 8	512 x 8	512 x 8	512 x 8	512 x 8	512 x 8
Memory Interface	Not specified	I2C	I2C	I2C	I2C	I2C	I2C	I2C	I2C	I2C	I2C
Clock Frequency	Not specified	1 MHz	1 MHz	1 MHz	1 MHz	400 kHz	400 kHz	400 kHz	400 kHz	400 kHz	1 MHz
Access Time	Not specified	450 ns	550 ns	550 ns	Not specified	Not specified	Not specified	Not specified	900 ns	900 ns	450 ns
Write Cycle Time	Not specified	5ms	5ms	5ms	5ms	5ms	5ms	5ms	5ms	5ms	4ms
Voltage - Supply	Not specified	1.7V ~ 3.6V	1.7V ~ 5.5V	1.8V ~ 5.5V	1.6V ~ 5.5V	1.6V ~ 5.5V	1.8V ~ 5.5V	1.6V ~ 5.5V	1.7V ~ 5.5V	2.5V ~ 5.5V	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP-B	8-TSSOP-B	8-TSSOP-B	8-TSSOP-B	8-TSSOP	8-TSSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Part Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Automotive Grade	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	AEC-Q100	AEC-Q100

Engineering Selection Recommendations

Microchip Technology Substitutes (Direct Manufacturer Alternatives):

AT24C04D-XHM-T is an active Microchip EEPROM device with 1 MHz clock frequency and 450 ns access time. This part offers the narrowest supply voltage range (1.7V ~ 3.6V) and MSL 1 rating, indicating superior moisture resistance. Suitable for applications with strict power budget constraints.

AT24CS04-XHM-T provides extended supply voltage range (1.7V ~ 5.5V) with 1 MHz operation and 550 ns access time. MSL 3 rating matches the original part. Recommended for general-purpose embedded applications.

AT24HC04B-TH-T operates at 1 MHz with 550 ns access time and supply range 1.8V ~ 5.5V. MSL 3 rating. Suitable for standard industrial applications.

Rohm Semiconductor Substitutes:

BR24G04FVT-3AGE2 and BR24G04FVT-3GE2 differ in clock frequency (1 MHz vs. 400 kHz). Both feature MSL 1 and extended voltage range (1.6V ~ 5.5V). The 1 MHz variant maintains performance parity with Microchip 1 MHz options.

BR24L04FVT-WE2 and BR24T04FVT-WE2 operate at 400 kHz with MSL 1 rating and voltage range 1.8V ~ 5.5V and 1.6V ~ 5.5V respectively. Suitable for lower-speed I2C bus applications.

onsemi Substitutes:

CAT24C04YI-GT3 operates at 400 kHz with 900 ns access time, MSL 1, and voltage range 1.7V ~ 5.5V. Recommended for general industrial applications.

CAV24C04YE-GT3 is AEC-Q100 qualified automotive-grade EEPROM with extended temperature range (-40°C ~ 125°C), 400 kHz operation, and MSL 1. Voltage range 2.5V ~ 5.5V. Suitable for automotive and extended-temperature applications.

STMicroelectronics Substitute:

M24C04-DRDW3TP/K is AEC-Q100 qualified with 1 MHz clock frequency, 450 ns access time, and extended temperature range (-40°C ~ 125°C). Supply voltage 1.7V ~ 5.5V with MSL 1. Write cycle time 4ms (faster than 5ms standard). Recommended for automotive and high-reliability applications.

Selection Priority:

For direct replacement in non-automotive applications: AT24C04D-XHM-T or AT24CS04-XHM-T (Microchip active products).

For automotive or extended-temperature requirements: CAV24C04YE-GT3 or M24C04-DRDW3TP/K (AEC-Q100 qualified).

For cost-optimized solutions with lower clock frequency tolerance: BR24L04FVT-WE2 or CAT24C04YI-GT3.

All substitutes maintain ROHS3 compliance and REACH unaffected status. Package compatibility is confirmed for 8-TSSOP form factor across all options.

Frequently Asked Questions (FAQ)

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

A: AT24C04D-XHM-T is functionally compatible in terms of package (8-TSSOP), memory capacity (4Kbit), and interface (I2C). However, the original part is a secure memory device while the substitute is standard EEPROM. Verify that security features are not required for your application. Supply voltage range differs (1.7V ~ 3.6V vs. unspecified original), so confirm your system voltage compatibility.

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

A: Clock frequency determines I2C bus speed capability. 1 MHz-rated parts (AT24C04D-XHM-T, AT24HC04B-TH-T, M24C04-DRDW3TP/K) support faster data transfer rates. 400 kHz-rated parts (BR24L04FVT-WE2, CAT24C04YI-GT3, CAV24C04YE-GT3) operate at standard I2C speed. Both are compatible with I2C bus specifications. Select based on your system's I2C clock requirements.

Q: Why do some substitutes have MSL 1 while others have MSL 3?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to moisture before soldering. MSL 1 (unlimited) provides superior moisture resistance and longer shelf life. MSL 3 (168 hours) requires more careful handling and storage. For high-volume manufacturing or long-term inventory, MSL 1 parts are preferred.

Q: Are automotive-grade parts (CAV24C04YE-GT3, M24C04-DRDW3TP/K) necessary for non-automotive applications?

A: Automotive-grade parts carry AEC-Q100 qualification and extended temperature range (-40°C ~ 125°C). These are not required for standard industrial applications operating within -40°C ~ 85°C. However, they offer higher reliability margins and are suitable for harsh environment applications. Cost may be higher than standard-grade alternatives.

Q: What is the significance of the 8-TSSOP-B package variant used by Rohm parts?

A: 8-TSSOP-B is a variant of the 8-TSSOP package with identical pin pitch and dimensions (0.173", 4.40mm width). It is mechanically and electrically compatible with standard 8-TSSOP footprints. No PCB redesign is required when substituting between 8-TSSOP and 8-TSSOP-B variants.

Q: Which substitute offers the fastest access time?

A: AT24C04D-XHM-T and M24C04-DRDW3TP/K both provide 450 ns access time, the fastest among the listed substitutes. AT24CS04-XHM-T and AT24HC04B-TH-T offer 550 ns. onsemi parts (CAT24C04YI-GT3, CAV24C04YE-GT3) provide 900 ns. Select based on your system's timing requirements.

Q: Can I use CAV24C04YE-GT3 in a standard industrial application?

A: Yes. CAV24C04YE-GT3 is AEC-Q100 qualified but not restricted to automotive use. It operates within standard -40°C ~ 85°C range and is compatible with general embedded applications. The extended temperature capability (-40°C ~ 125°C) and automotive qualification provide additional margin without restricting use in other applications.

Q: What is the write cycle time difference between M24C04-DRDW3TP/K (4ms) and other substitutes (5ms)?

A: M24C04-DRDW3TP/K completes write operations in 4ms versus 5ms for other parts. This 20% faster write cycle may benefit applications with high write frequency requirements. However, both timings are within standard EEPROM specifications and are compatible with typical I2C bus protocols.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the original AT88SC0404CA-TH-T compliance status. No regulatory or environmental restrictions apply to any substitute option.

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