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FT24C64A-UTR-T Equivalent & Substitute Parts
Part Overview
The FT24C64A-UTR-T is a 64Kbit EEPROM memory IC with I2C interface manufactured by Fremont Micro Devices Ltd. This device operates at 800 kHz clock frequency with 700 ns access time, supporting supply voltages from 1.8V to 5.5V across an operating temperature range of -40°C to 85°C. The part is packaged in 8-TSSOP surface mount configuration and is currently listed as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Size | 64Kbit |
| Memory Organization | 8K x 8 |
| Memory Interface | I2C |
| Clock Frequency | 800 kHz |
| Access Time | 700 ns |
| Write Cycle Time | 5ms |
| 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 |
Substitute Part Grouping Explanation
Substitution for the FT24C64A-UTR-T is determined by the following mandatory parameters:
- Memory capacity of 64Kbit with 8K x 8 organization
- I2C serial interface protocol
- 8-TSSOP surface mount package with identical physical dimensions
- Supply voltage range compatibility (minimum 1.8V support required)
- Write cycle time of 5ms
- Operating temperature range of -40°C to 85°C minimum
Substitute parts are grouped into two categories based on clock frequency performance:
Standard Speed Group (400 kHz): Parts with 400 kHz clock frequency and 900 ns access time. These parts maintain full functional compatibility with the original FT24C64A-UTR-T while operating at reduced speed. All parts in this group are from Microchip Technology and carry active product status with RoHS3 compliance.
High Speed Group (1 MHz): Parts with 1 MHz clock frequency and 400 ns access time. These parts provide enhanced performance characteristics while maintaining backward compatibility with systems designed for the original part. All parts in this group are from Microchip Technology with active product status and RoHS3 compliance.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Access Time | Voltage Supply | Operating Temp | Package | Product Status | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|
| FT24C64A-UTR-T | Fremont Micro Devices Ltd | 64Kbit | 800 kHz | 700 ns | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Obsolete | Tape & Reel |
| 24AA64-E/ST | Microchip Technology | 64Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 125°C | 8-TSSOP | Active | Tube |
| 24AA64F-I/ST | Microchip Technology | 64Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | Tube |
| 24AA64FT-I/ST | Microchip Technology | 64Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | Tape & Reel |
| 24AA64T-E/ST | Microchip Technology | 64Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 125°C | 8-TSSOP | Active | Tape & Reel |
| 24AA64T-I/ST | Microchip Technology | 64Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | Cut Tape & Digi-Reel |
| 24FC64-I/ST | Microchip Technology | 64Kbit | 1 MHz | 400 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | Tube |
| 24FC64F-I/ST | Microchip Technology | 64Kbit | 1 MHz | 400 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | Tube |
| 24FC64FT-I/ST | Microchip Technology | 64Kbit | 1 MHz | 400 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | Tape & Reel |
| 24FC64T-I/ST | Microchip Technology | 64Kbit | 1 MHz | 400 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | Tape & Reel |
| AT24C64B-10TU-1.8 | Microchip Technology | 64Kbit | 400 kHz | 900 ns | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | Tube |
Engineering Selection Recommendations
All listed substitute parts are manufactured by Microchip Technology and carry active product status, ensuring long-term availability and supply chain stability. All substitute parts comply with RoHS3 regulations and carry REACH unaffected status where specified, meeting current environmental and regulatory requirements.
For applications requiring direct replacement with identical packaging format, Tape & Reel options include 24AA64FT-I/ST, 24AA64T-E/ST, 24FC64FT-I/ST, and 24FC64T-I/ST. These parts maintain the same surface mount configuration as the original FT24C64A-UTR-T.
For applications with extended temperature requirements up to 125°C, 24AA64-E/ST and 24AA64T-E/ST provide expanded operating range while maintaining 400 kHz clock frequency operation.
For applications requiring enhanced speed performance, the 24FC64 series (24FC64-I/ST, 24FC64F-I/ST, 24FC64FT-I/ST, 24FC64T-I/ST) operates at 1 MHz with 400 ns access time, providing superior performance characteristics within the same 8-TSSOP package footprint.
The AT24C64B-10TU-1.8 provides exact voltage supply range matching (1.8V ~ 5.5V) with the original FT24C64A-UTR-T while offering active product status and RoHS3 compliance.
Frequently Asked Questions (FAQ)
Q: Can I use a 24AA64 series part as a direct replacement for FT24C64A-UTR-T?
A: Yes. The 24AA64 series maintains 64Kbit capacity, I2C interface, 8-TSSOP package, and 5ms write cycle time. The 400 kHz clock frequency is lower than the original 800 kHz, but this does not prevent functional substitution in most applications. Verify that your system timing requirements accommodate the 900 ns access time versus the original 700 ns.
Q: What is the difference between 24AA64F-I/ST and 24AA64FT-I/ST?
A: Both parts are identical in electrical specifications. The difference is packaging format: 24AA64F-I/ST is supplied in Tube packaging, while 24AA64FT-I/ST is supplied in Tape & Reel format. Select based on your procurement and assembly requirements.
Q: Should I use the 24FC64 series for higher speed applications?
A: The 24FC64 series operates at 1 MHz clock frequency with 400 ns access time, compared to 400 kHz and 900 ns for the 24AA64 series. Use the 24FC64 series when your application requires faster I2C communication speeds. All other electrical and package parameters remain compatible.
Q: Is the AT24C64B-10TU-1.8 compatible with my 1.8V minimum supply voltage requirement?
A: Yes. The AT24C64B-10TU-1.8 supports 1.8V ~ 5.5V supply range, matching the original FT24C64A-UTR-T specification. Other 24AA64 and 24FC64 variants support 1.7V minimum, which is also compatible with 1.8V systems.
Q: What packaging options are available for high-volume production?
A: Tape & Reel packaging is available in 24AA64FT-I/ST, 24AA64T-E/ST, 24AA64T-I/ST, 24FC64FT-I/ST, and 24FC64T-I/ST. These parts are suitable for automated assembly processes. Tube packaging alternatives are available in 24AA64-E/ST, 24AA64F-I/ST, 24FC64-I/ST, and 24FC64F-I/ST for lower-volume applications.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed Microchip Technology substitute parts carry RoHS3 compliance certification and REACH unaffected status, meeting current environmental regulations for electronic components.
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