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FT24C08A-USR-T EEPROM Memory IC Equivalent & Substitute Parts
Part Overview
The FT24C08A-USR-T is an 8Kbit I2C EEPROM memory IC manufactured by Fremont Micro Devices Ltd, designed for non-volatile data storage applications requiring I2C serial communication. This part operates at 1 MHz clock frequency with 550 ns access time and supports a supply voltage range of 1.8V to 5.5V across an operating temperature range of -40°C to 85°C. The device is packaged in an 8-SOP surface mount configuration and is ROHS3 compliant.
The FT24C08A-USR-T is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers including Fremont Micro Devices Ltd, Microchip Technology, and Rohm Semiconductor, offering functional alternatives with identical or compatible electrical and mechanical specifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Size | 8Kbit |
| Memory Organization | 1K x 8 |
| Memory Interface | I2C |
| Clock Frequency | 1 MHz |
| Access Time | 550 ns |
| Write Cycle Time | 5 ms |
| Voltage Supply Range | 1.8V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Package Type | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the FT24C08A-USR-T are classified into two categories based on electrical and mechanical compatibility:
Parametric Equivalents maintain identical specifications across all critical parameters: 8Kbit memory size, 1K x 8 organization, I2C interface, 1 MHz clock frequency, 550 ns access time, 5 ms write cycle time, 1.8V to 5.5V supply voltage, -40°C to 85°C operating temperature, and 8-SOIC package format. These parts are direct functional replacements with no design modifications required.
Similar Parts share the same memory capacity, organization, interface protocol, and package family but differ in one or more of the following parameters: clock frequency (400 kHz vs. 1 MHz), access time (900 ns vs. 550 ns), supply voltage range (2.5V minimum vs. 1.8V minimum), operating temperature range (up to 125°C vs. 85°C), or package width variant (4.40mm vs. 3.90mm). These parts require verification of application-specific requirements before substitution.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Access Time | Supply Voltage | Operating Temperature | Package | Product Status |
|---|---|---|---|---|---|---|---|---|
| FT24C08A-USR-T | Fremont Micro Devices Ltd | 8Kbit | 1 MHz | 550 ns | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOP (3.90mm) | Discontinued |
| FT24C08A-ESG-T | Fremont Micro Devices Ltd | 8Kbit | 1 MHz | 550 ns | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOP (3.90mm) | Active |
| FT24C08A-ESR-T | Fremont Micro Devices Ltd | 8Kbit | 1 MHz | 550 ns | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOP (3.90mm) | Active |
| AT24C08C-SSPD-T | Microchip Technology | 8Kbit | 1 MHz | 900 ns | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-SOIC (3.90mm) | Active |
| AT24CS08-SSHM-T | Microchip Technology | 8Kbit | 1 MHz | 550 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | Active |
| BR24A08F-WME2 | Rohm Semiconductor | 8Kbit | 400 kHz | Not specified | 2.5V ~ 5.5V | -40°C ~ 105°C | 8-SOP (4.40mm) | Active |
| BR24G08F-3AGTE2 | Rohm Semiconductor | 8Kbit | 1 MHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOP (4.40mm) | Active |
| BR24G08FJ-3AGTE2 | Rohm Semiconductor | 8Kbit | 1 MHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOP-J (3.90mm) | Active |
| BR24G08FJ-3GTE2 | Rohm Semiconductor | 8Kbit | 400 kHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOP-J (3.90mm) | Active |
| BR24L08F-WE2 | Rohm Semiconductor | 8Kbit | 400 kHz | Not specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOP (4.40mm) | Active |
| BR24L08FJ-WE2 | Rohm Semiconductor | 8Kbit | 400 kHz | Not specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOP-J (3.90mm) | Active |
Engineering Selection Recommendations
Direct Replacement (Parametric Equivalents):
FT24C08A-ESG-T and FT24C08A-ESR-T are parametric equivalents of the FT24C08A-USR-T, offering identical electrical and mechanical specifications. Both parts are manufactured by Fremont Micro Devices Ltd with active product status. Selection between these two variants depends on packaging requirements: FT24C08A-ESG-T is supplied in Tape & Reel (TR) packaging, while FT24C08A-ESR-T is also supplied in Tape & Reel format. Both maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).
Compatible Alternatives (Similar Parts):
AT24CS08-SSHM-T (Microchip Technology) provides functional compatibility with matching 1 MHz clock frequency and 550 ns access time. The supply voltage range extends to 1.7V minimum, and operating temperature remains -40°C to 85°C. This part is actively produced and ROHS3 compliant.
BR24G08FJ-3AGTE2 and BR24G08FJ-3GTE2 (Rohm Semiconductor) offer 8-SOP-J packaging with 3.90mm width matching the original part's physical footprint. BR24G08FJ-3AGTE2 operates at 1 MHz clock frequency with 1.6V to 5.5V supply range. BR24G08FJ-3GTE2 operates at 400 kHz with identical voltage and temperature specifications. Both are actively produced with ROHS3 compliance.
BR24L08FJ-WE2 (Rohm Semiconductor) operates at 400 kHz with 1.8V to 5.5V supply voltage and -40°C to 85°C temperature range in 8-SOP-J packaging. This part is actively produced and verified for DiGi-Electronics programmability.
Conditional Substitutes (Voltage or Temperature Constraints):
AT24C08C-SSPD-T (Microchip Technology) requires minimum 2.5V supply voltage and supports extended operating temperature to 125°C. This part is suitable only for applications with 2.5V minimum supply availability and automotive-grade requirements (AEC-Q100 qualified).
BR24A08F-WME2 (Rohm Semiconductor) operates at 400 kHz with 2.5V minimum supply voltage and extended temperature range to 105°C. This part is automotive-grade (AEC-Q100 qualified) and suitable for applications requiring higher temperature operation.
Frequently Asked Questions (FAQ)
Q: Can FT24C08A-ESG-T or FT24C08A-ESR-T be used as direct replacements for the discontinued FT24C08A-USR-T?
A: Yes. Both parts are parametric equivalents with identical memory capacity (8Kbit), organization (1K x 8), I2C interface, 1 MHz clock frequency, 550 ns access time, 1.8V to 5.5V supply voltage range, and -40°C to 85°C operating temperature. The only difference is packaging format (Tape & Reel vs. the original part's format). No circuit modifications are required.
Q: What is the primary difference between 1 MHz and 400 kHz clock frequency variants?
A: Clock frequency determines the maximum I2C bus speed. The 1 MHz variants (FT24C08A-ESG-T, FT24C08A-ESR-T, AT24CS08-SSHM-T, BR24G08F-3AGTE2, BR24G08FJ-3AGTE2) support faster data transfer rates. The 400 kHz variants (BR24A08F-WME2, BR24G08FJ-3GTE2, BR24L08F-WE2, BR24L08FJ-WE2) operate at lower bus speeds. Selection depends on application I2C bus configuration and timing requirements.
Q: Are there package width differences between substitute parts?
A: Yes. The original FT24C08A-USR-T uses 8-SOP packaging with 3.90mm width. Some Rohm Semiconductor alternatives (BR24A08F-WME2, BR24G08F-3AGTE2, BR24L08F-WE2) use 8-SOP packaging with 4.40mm width. This difference may affect PCB layout compatibility. Verify footprint dimensions before substitution. The 8-SOP-J variants (BR24G08FJ-3AGTE2, BR24G08FJ-3GTE2, BR24L08FJ-WE2) maintain the 3.90mm width and are footprint-compatible.
Q: What supply voltage range considerations apply when selecting substitutes?
A: The original part operates from 1.8V to 5.5V. AT24CS08-SSHM-T extends the lower limit to 1.7V. BR24G08F-3AGTE2 and BR24G08FJ-3AGTE2 extend to 1.6V. Conversely, AT24C08C-SSPD-T and BR24A08F-WME2 require minimum 2.5V supply. Verify your application's supply voltage range matches the selected part's specifications.
Q: Which substitute parts are suitable for automotive applications?
A: AT24C08C-SSPD-T and BR24A08F-WME2 are automotive-grade parts with AEC-Q100 qualification. These parts support extended operating temperature ranges (up to 125°C and 105°C respectively) and are suitable for automotive and industrial environments requiring higher reliability standards.
Q: Is access time a critical parameter for substitution?
A: Access time affects data retrieval speed. The original part specifies 550 ns access time. AT24CS08-SSHM-T matches this specification. AT24C08C-SSPD-T specifies 900 ns access time, which is slower but functionally compatible for most applications. Rohm Semiconductor parts do not specify access time in the provided data. Verify access time requirements for timing-critical applications before substitution.
Q: What is the significance of MSL (Moisture Sensitivity Level) ratings?
A: All listed parts carry MSL 1 (Unlimited) or MSL 3 (168 Hours) ratings. MSL 1 parts have unlimited shelf life under controlled storage conditions. MSL 3 parts require reflow processing within 168 hours of package opening. For high-volume production or extended storage, MSL 1 parts (all listed equivalents except AT24C08C-SSPD-T which carries MSL 3) are preferred.
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