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FT24C128A-UTR-T Equivalent & Substitute Parts
Part Overview
The FT24C128A-UTR-T is a 128Kbit I2C EEPROM memory IC manufactured by Fremont Micro Devices Ltd in 8-TSSOP surface mount packaging. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. The device operates across a wide supply voltage range (1.8V to 5.5V) and temperature range (-40°C to 85°C), making it suitable for industrial and consumer applications requiring non-volatile memory storage.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Size | 128Kbit |
| Memory Organization | 16K 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-TSSOP |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict parameter matching across memory capacity, interface protocol, package type, and electrical operating ranges. The FT24C128A-UTR-T requires replacement parts meeting these criteria:
Critical Parameters for Substitution:
- Memory Size: 128Kbit (exact match required)
- Memory Organization: 16K x 8 (exact match required)
- Memory Interface: I2C (exact match required)
- Package Type: 8-TSSOP (exact match required)
- Voltage Supply Range: Must encompass or match 1.8V ~ 5.5V
- Operating Temperature: Must encompass or match -40°C ~ 85°C
- RoHS Compliance: ROHS3 Compliant (required)
Substitute parts are categorized as Parametric Equivalents (identical electrical and mechanical specifications) or Similar parts (functionally compatible with minor parameter variations in clock frequency or access time).
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Access Time | Voltage Supply | Operating Temp | Package | Product Status | MSL Rating |
|---|---|---|---|---|---|---|---|---|---|
| FT24C128A-UTR-T | Fremont Micro Devices | 128Kbit | 1 MHz | 550 ns | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Discontinued | 1 |
| FT24C128A-ETG-T | Fremont Micro Devices | 128Kbit | 1 MHz | 550 ns | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 1 |
| FT24C128A-ETR-T | Fremont Micro Devices | 128Kbit | 1 MHz | 550 ns | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 1 |
| 24AA128-I/ST | Microchip Technology | 128Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 1 |
| 24AA128T-I/ST | Microchip Technology | 128Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 1 |
| 24FC128-I/ST | Microchip Technology | 128Kbit | 1 MHz | 400 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 1 |
| 24FC128T-I/ST | Microchip Technology | 128Kbit | 1 MHz | 400 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 1 |
| AT24C128C-XHM-T | Microchip Technology | 128Kbit | 1 MHz | 550 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 3 |
| BR24G128FVT-3AGE2 | Rohm Semiconductor | 128Kbit | 1 MHz | Not specified | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP-B | Active | 1 |
| BR24G128FVT-3GE2 | Rohm Semiconductor | 128Kbit | 400 kHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP-B | Active | 1 |
| BR24S128FVT-WE2 | Rohm Semiconductor | 128Kbit | 400 kHz | Not specified | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP-B | Active | 1 |
Engineering Selection Recommendations
Parametric Equivalents (Direct Replacement):
FT24C128A-ETG-T and FT24C128A-ETR-T are parametric equivalents from the same manufacturer with identical electrical specifications. Both are active products with ROHS3 compliance and MSL rating 1. FT24C128A-ETR-T offers higher inventory availability (10,300 pcs) compared to FT24C128A-ETG-T (1,043 pcs).
Similar Parts with 1 MHz Operation:
24FC128-I/ST and 24FC128T-I/ST (Microchip Technology) match the 1 MHz clock frequency and 550 ns access time requirement. Both are active products with ROHS3 compliance. The 24FC128T-I/ST variant has significantly higher inventory (45,436 pcs). Voltage supply range is 1.7V ~ 5.5V, which encompasses the original specification.
AT24C128C-XHM-T (Microchip Technology) provides identical electrical performance (1 MHz, 550 ns access time) with active product status and ROHS3 compliance. MSL rating is 3 (168 Hours), which differs from the original MSL 1 rating and may require moisture control during storage and handling.
BR24G128FVT-3AGE2 (Rohm Semiconductor) operates at 1 MHz with 1.7V ~ 5.5V supply range and active product status. Package designation is 8-TSSOP-B variant. ROHS3 compliance and MSL 1 rating are maintained.
Similar Parts with 400 kHz Operation:
24AA128-I/ST, 24AA128T-I/ST, BR24G128FVT-3GE2, and BR24S128FVT-WE2 operate at 400 kHz clock frequency, resulting in slower access times (900 ns for Microchip parts). These are suitable for applications where reduced clock frequency is acceptable. All maintain ROHS3 compliance and MSL 1 rating (except BR24G128FVT-3GE2 which specifies 1.6V minimum supply).
Frequently Asked Questions (FAQ)
Q: Can I use a 400 kHz I2C EEPROM as a direct replacement for the 1 MHz FT24C128A-UTR-T?
A: Yes, functionally. The 400 kHz parts (24AA128 series, BR24G128FVT-3GE2, BR24S128FVT-WE2) are backward compatible in I2C bus systems. The I2C bus will operate at the lower clock frequency. This is acceptable if your system does not require 1 MHz operation. Verify your application's timing requirements before selection.
Q: What is the difference between 8-TSSOP and 8-TSSOP-B packaging?
A: Both are 8-pin thin shrink small outline packages with identical 0.173" width and 4.40mm dimensions. The -B designation indicates a variant from Rohm Semiconductor. Pin configuration and footprint compatibility should be verified against your PCB design.
Q: Why does AT24C128C-XHM-T have MSL rating 3 instead of 1?
A: MSL (Moisture Sensitivity Level) rating 3 requires moisture control during storage (168 hours maximum at 30°C/60% RH before baking). MSL 1 (unlimited) has no moisture sensitivity restrictions. If your supply chain and storage conditions cannot accommodate MSL 3 requirements, select parts with MSL 1 rating.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original FT24C128A-UTR-T specification.
Q: What is the minimum voltage supply requirement across all substitutes?
A: The original part specifies 1.8V minimum. Most substitutes specify 1.7V minimum (Microchip, Rohm parts), which is compatible. BR24G128FVT-3GE2 specifies 1.6V minimum, providing the widest operating range.
Q: Which substitute has the highest inventory availability?
A: 24FC128T-I/ST (Microchip Technology) with 45,436 pcs in stock, followed by AT24C128C-XHM-T with 50,300 pcs. Both are active products suitable for immediate procurement.
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