S-24CS08AFT-TB-1G EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The S-24CS08AFT-TB-1G is an 8Kbit I2C EEPROM memory IC manufactured by ABLIC Inc., packaged in 8-TSSOP surface mount configuration. This component operates across a supply voltage range of 1.8V to 5.5V with an operating temperature range of -40°C to 85°C. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Memory Size	8Kbit
Memory Organization	1K x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	10ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
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 S-24CS08AFT-TB-1G is determined by the following core parameters:

Critical Parameters (Must Match):

Memory Size: 8Kbit
Memory Organization: 1K x 8
Memory Interface: I2C
Package Type: 8-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Clock Frequency: 400 kHz (baseline) to 1 MHz (higher performance acceptable)
Access Time: 900 ns (baseline) to 450 ns (faster acceptable)
Write Cycle Time: 10ms (baseline) to 4ms (faster acceptable)
Voltage Supply Range: Minimum 1.6V to 1.8V; Maximum 5.5V (overlapping ranges acceptable)
Operating Temperature: -40°C to 85°C (baseline); extended to 125°C acceptable for automotive-grade parts
Moisture Sensitivity Level: 1 to 3 (higher MSL acceptable for non-critical applications)

Substitute parts must maintain I2C protocol compatibility, identical memory capacity, and identical package footprint. Parts with higher clock frequencies, faster access times, and faster write cycles are functionally compatible and provide performance headroom. Extended temperature ranges and automotive qualifications represent enhanced capability without compromising baseline functionality.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Operating Temp	Package	Product Status
S-24CS08AFT-TB-1G	ABLIC Inc.	8Kbit	400 kHz	900 ns	10ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
AT24CS08-XHM-T	Microchip Technology	8Kbit	1 MHz	550 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G08FVT-3GE2	Rohm Semiconductor	8Kbit	400 kHz	Not specified	5ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24L08FVT-WE2	Rohm Semiconductor	8Kbit	400 kHz	Not specified	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24S08FVT-WE2	Rohm Semiconductor	8Kbit	400 kHz	Not specified	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24T08FVT-WE2	Rohm Semiconductor	8Kbit	400 kHz	Not specified	5ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
CAT24C08YI-GT3	onsemi	8Kbit	400 kHz	900 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C08-DRDW3TP/K	STMicroelectronics	8Kbit	1 MHz	450 ns	4ms	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M24C08-DRDW8TP/K	STMicroelectronics	8Kbit	1 MHz	450 ns	4ms	1.8V ~ 5.5V	-40°C ~ 105°C	8-TSSOP	Active
M24C08-FDW6TP	STMicroelectronics	8Kbit	400 kHz	900 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C08-RDW6TP	STMicroelectronics	8Kbit	400 kHz	900 ns	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Direct Functional Equivalents (Identical Performance Profile):

CAT24C08YI-GT3 (onsemi) and M24C08-RDW6TP (STMicroelectronics) provide direct functional equivalence to the S-24CS08AFT-TB-1G. Both maintain 400 kHz clock frequency, 900 ns access time, and identical voltage/temperature operating ranges. Both are ROHS3 compliant and actively manufactured. CAT24C08YI-GT3 carries DiGi-Electronics Programmable verification status. M24C08-RDW6TP carries DiGi-Electronics Programmable verification status.

Enhanced Performance Substitutes (Higher Speed, Faster Write):

AT24CS08-XHM-T (Microchip Technology) and M24C08-DRDW3TP/K (STMicroelectronics) offer 1 MHz clock frequency with 550 ns and 450 ns access times respectively, and 5ms/4ms write cycle times. These parts provide performance headroom while maintaining full backward compatibility. M24C08-DRDW3TP/K includes automotive-grade qualification (AEC-Q100) and extended temperature range to 125°C.

Automotive-Grade Option:

M24C08-DRDW3TP/K qualifies for automotive applications with AEC-Q100 certification and -40°C to 125°C operating temperature range. This part is suitable for designs requiring automotive-grade components.

Rohm Semiconductor Series (400 kHz Baseline):

BR24T08FVT-WE2, BR24L08FVT-WE2, BR24S08FVT-WE2, and BR24G08FVT-3GE2 maintain 400 kHz clock frequency matching the original part. BR24L08FVT-WE2 and BR24S08FVT-WE2 carry DiGi-Electronics Programmable verification. All are actively manufactured with high inventory availability.

Packaging Consideration:

Rohm Semiconductor parts use 8-TSSOP-B package variant. While mechanically compatible with 8-TSSOP footprint, design verification is recommended for critical applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 1 MHz I2C EEPROM as a substitute for the 400 kHz S-24CS08AFT-TB-1G?

A: Yes. Higher clock frequency parts (1 MHz) are fully backward compatible with 400 kHz system designs. The I2C bus will operate at the lower speed determined by the master controller. Faster access times and write cycles provide performance headroom without compromising functionality.

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packages?

A: Both packages maintain identical 0.173" width and 4.40mm body dimensions with identical pin configurations. The -B designation indicates a variant within the TSSOP family. Mechanical compatibility is maintained for PCB footprint purposes. Design verification is recommended for critical applications to confirm thermal and electrical performance equivalence.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original S-24CS08AFT-TB-1G specification.

Q: Which substitute part has the fastest write cycle time?

A: M24C08-DRDW3TP/K and M24C08-DRDW8TP/K both feature 4ms write cycle time, compared to the original 10ms specification. This represents a 60% improvement in write performance.

Q: Can I use M24C08-DRDW3TP/K in non-automotive applications?

A: Yes. Automotive-grade parts exceed standard industrial specifications and are fully compatible with non-automotive designs. The AEC-Q100 qualification and extended temperature range represent enhanced capability without introducing incompatibility.

Q: What is the voltage supply overlap between the original part and substitutes?

A: The S-24CS08AFT-TB-1G operates 1.8V to 5.5V. All substitute parts maintain the 5.5V upper limit. Lower voltage limits range from 1.6V to 1.8V across the substitute family. For designs operating at 1.8V or higher, all substitutes are compatible. For designs below 1.8V, verify substitute part minimum voltage specification.

Q: Which substitute parts carry DiGi-Electronics Programmable verification?

A: CAT24C08YI-GT3, BR24L08FVT-WE2, BR24S08FVT-WE2, M24C08-DRDW3TP/K, and M24C08-RDW6TP carry DiGi-Electronics Programmable verification status, indicating validated programming compatibility.

Q: Is the S-24CS08AFT-TB-1G still available?

A: The S-24CS08AFT-TB-1G is classified as obsolete. Current inventory of 6088 pieces is available, but long-term availability is not assured. Migration to active substitute parts is recommended for new designs and ongoing production planning.

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