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FT24C08A-USR-B EEPROM Memory IC Equivalent & Substitute Parts
Part Overview
The FT24C08A-USR-B 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 is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts must maintain compatibility across memory capacity, interface protocol, package type, and electrical operating parameters to ensure direct replacement capability in existing designs.
Substiute Parts
Key Parameters
| Parameter | FT24C08A-USR-B |
|---|---|
| Memory Size | 8Kbit |
| Memory Organization | 1K x 8 |
| Memory Interface | I2C |
| Clock Frequency | 1 MHz |
| Access Time | 550 ns |
| Write Cycle Time | 5ms |
| 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 |
| MSL Rating | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the FT24C08A-USR-B is determined by strict adherence to the following parameters:
Critical Parameters (Must Match):
- Memory Size: 8Kbit
- Memory Organization: 1K x 8
- Memory Interface: I2C
- Package Type: 8-SOIC with 0.154" (3.90mm) width
- Write Cycle Time: 5ms
Compatible Parameter Ranges:
- Clock Frequency: 1 MHz or lower (backward compatible)
- Access Time: 550 ns or faster
- Voltage Supply: Must encompass or exceed 1.8V ~ 5.5V range
- Operating Temperature: Must support -40°C ~ 85°C minimum
- RoHS Status: ROHS3 Compliant required
Substitute parts are grouped by clock frequency capability (1 MHz vs. 400 kHz) and package variant (8-SOP vs. 8-SOP-J). Parts operating at 400 kHz are functionally compatible as they operate within the I2C protocol specification and maintain all other critical parameters.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Access Time | Voltage Supply | Operating Temp | Package | Status |
|---|---|---|---|---|---|---|---|---|
| FT24C08A-USR-B | Fremont Micro Devices | 8Kbit | 1 MHz | 550 ns | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | Discontinued |
| 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-SOIC (4.40mm) | Active |
| BR24G08F-3AGTE2 | Rohm Semiconductor | 8Kbit | 1 MHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (4.40mm) | Active |
| BR24G08FJ-3AGTE2 | Rohm Semiconductor | 8Kbit | 1 MHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | Active |
| BR24G08FJ-3GTE2 | Rohm Semiconductor | 8Kbit | 400 kHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | Active |
| BR24L08F-WE2 | Rohm Semiconductor | 8Kbit | 400 kHz | Not specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (4.40mm) | Active |
| BR24L08FJ-WE2 | Rohm Semiconductor | 8Kbit | 400 kHz | Not specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | Active |
| BR24S08FJ-WE2 | Rohm Semiconductor | 8Kbit | 400 kHz | Not specified | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (3.90mm) | Active |
| BR24T08F-WE2 | Rohm Semiconductor | 8Kbit | 400 kHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-SOIC (4.40mm) | Active |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
AT24CS08-SSHM-T is the optimal substitute, matching the original part's 1 MHz clock frequency, 550 ns access time, and 8-SOIC (3.90mm) package footprint. Voltage supply range of 1.7V ~ 5.5V encompasses the original specification. Microchip Technology maintains active product status with ROHS3 compliance and MSL 1 rating.
BR24G08FJ-3AGTE2 provides equivalent 1 MHz operation and matching package dimensions (8-SOIC, 3.90mm). Rohm Semiconductor's part extends voltage supply to 1.6V minimum and maintains -40°C ~ 85°C operating range. Active status and ROHS3 compliance confirmed.
Secondary Substitutes (400 kHz Operation):
BR24L08FJ-WE2, BR24G08FJ-3GTE2, and BR24S08FJ-WE2 operate at 400 kHz, which is compatible with I2C protocol specifications and backward compatible with 1 MHz-capable systems. All three maintain 8-SOIC (3.90mm) package compatibility and -40°C ~ 85°C operating temperature range. Voltage supply ranges (1.6V ~ 5.5V to 1.8V ~ 5.5V) support the original specification envelope.
Package Consideration:
BR24A08F-WME2, BR24G08F-3AGTE2, BR24L08F-WE2, and BR24T08F-WE2 feature 8-SOIC (4.40mm) package width, which differs from the original 3.90mm specification. These parts are electrically compatible but require PCB layout verification for physical fit.
All recommended substitutes maintain ROHS3 compliance and MSL 1 or MSL 3 ratings suitable for standard manufacturing environments.
Frequently Asked Questions (FAQ)
Q: Can I use a 400 kHz I2C EEPROM to replace the 1 MHz FT24C08A-USR-B?
A: Yes. The I2C protocol supports multiple clock frequencies. A 400 kHz part operates at a lower speed but maintains full functional compatibility with systems designed for 1 MHz operation. The system will communicate at the lower speed without data loss or functional degradation.
Q: What is the significance of the package width difference (3.90mm vs. 4.40mm)?
A: Package width affects PCB footprint and component placement. The 3.90mm width matches the original part's physical dimensions. Parts with 4.40mm width require verification that the PCB layout accommodates the larger package before substitution.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and hazardous substance restrictions equivalent to the original part.
Q: Does voltage supply range affect substitution eligibility?
A: Substitute parts must support the system's operating voltage. The original part operates from 1.8V to 5.5V. Substitutes with ranges such as 1.6V ~ 5.5V or 1.7V ~ 5.5V encompass this specification and are compatible. Parts with minimum voltage above 1.8V (such as 2.5V minimum) may not be suitable for systems requiring 1.8V operation.
Q: What is MSL rating and why does it matter?
A: Moisture Sensitivity Level (MSL) indicates how long a component can be exposed to ambient humidity before soldering. MSL 1 (Unlimited) allows indefinite storage without special handling. MSL 3 (168 hours) requires controlled storage conditions. The original part's MSL 1 rating is matched by most substitutes, simplifying inventory management.
Q: Can I substitute AT24C08C-SSPD-T if my system operates at 1.8V?
A: No. AT24C08C-SSPD-T specifies a minimum voltage of 2.5V, which exceeds the 1.8V lower limit. Use AT24CS08-SSHM-T or BR24G08FJ-3AGTE2 instead, both supporting 1.8V or lower minimum voltages.
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