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Equivalent & Substitute Parts for 25LC128X-I/ST
Part Overview
The 25LC128X-I/ST is a 128Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 10 MHz with 8-TSSOP surface mount packaging. This non-volatile memory device operates across a supply voltage range of 2.5V to 5.5V and maintains functionality from -40°C to 85°C. The part is currently in active product status with ROHS3 compliance and unlimited moisture sensitivity level rating.
Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, extended lead times, or specific application parameters such as operating temperature range, supply voltage tolerance, or clock frequency specifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Size | 128Kbit |
| Memory Organization | 16K x 8 |
| Memory Interface | SPI |
| Clock Frequency | 10 MHz |
| Write Cycle Time | 5ms |
| Voltage Supply Range | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Package Type | 8-TSSOP |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution validity for 128Kbit SPI EEPROM devices in 8-TSSOP packaging is determined by the following critical parameters:
Memory Capacity & Interface: All substitute parts maintain 128Kbit capacity with 16K x 8 organization and SPI interface operation, ensuring functional equivalence at the memory architecture level.
Package Compatibility: All listed substitutes utilize 8-TSSOP (0.173", 4.40mm Width) or mechanically equivalent 8-LSSOP packaging, permitting direct PCB footprint compatibility.
Supply Voltage Range: Substitutes are grouped by minimum supply voltage specification. Parts rated 1.8V minimum (25AA128-I/ST, AT25128B-XHL-B, AT25128B-XHL-T, BR25S128FV-WE2, CAT25128YI-G, CAT25128YI-GT3) provide broader voltage tolerance than the 2.5V minimum specification of 25LC128X-I/ST. Parts rated 2.5V minimum (25LC128-E/ST, 25LC128-I/ST, CAV25128YE-GT3) match the original specification.
Clock Frequency: The 25LC128X-I/ST operates at 10 MHz. Substitute parts rated 20 MHz (AT25128B-XHL-B, AT25128B-XHL-T, BR25S128FV-WE2, CAT25128YI-G, CAT25128YI-GT3, M95128-DRDW3TP/K) provide higher performance capability. Parts rated 10 MHz (25AA128-I/ST, 25LC128-E/ST, 25LC128-I/ST, CAV25128YE-GT3) match the original specification.
Operating Temperature Range: The 25LC128X-I/ST operates from -40°C to 85°C. Substitutes rated -40°C to 125°C (25LC128-E/ST, CAV25128YE-GT3, M95128-DRDW3TP/K) provide extended high-temperature capability.
Product Status & Certifications: Active status parts are preferred for new designs. Automotive-grade parts (CAV25128YE-GT3, M95128-DRDW3TP/K) carry AEC-Q100 qualification. Obsolete status parts (CAT25128YI-G) are suitable only for legacy system maintenance.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Voltage Supply | Operating Temperature | Package | Product Status | Write Cycle Time |
|---|---|---|---|---|---|---|---|---|
| 25LC128X-I/ST | Microchip Technology | 128Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 5ms |
| 25AA128-I/ST | Microchip Technology | 128Kbit | 10 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 5ms |
| 25LC128-E/ST | Microchip Technology | 128Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-TSSOP | Active | 5ms |
| 25LC128-I/ST | Microchip Technology | 128Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 5ms |
| AT25128B-XHL-B | Microchip Technology | 128Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 5ms |
| AT25128B-XHL-T | Microchip Technology | 128Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 5ms |
| BR25S128FV-WE2 | ROHM Semiconductor | 128Kbit | 20 MHz | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-LSSOP | Not For New Designs | 5ms |
| CAT25128YI-G | onsemi | 128Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Obsolete | 5ms |
| CAT25128YI-GT3 | onsemi | 128Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active | 5ms |
| CAV25128YE-GT3 | onsemi | 128Kbit | 10 MHz | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-TSSOP | Active | 5ms |
| M95128-DRDW3TP/K | STMicroelectronics | 128Kbit | 20 MHz | 1.8V ~ 5.5V | -40°C ~ 125°C | 8-TSSOP | Active | 4ms |
Engineering Selection Recommendations
Direct Functional Equivalents (Preferred for Standard Applications)
25LC128-I/ST and 25LC128-E/ST are Microchip Technology parts maintaining identical memory architecture, SPI interface, and package specifications. 25LC128-I/ST matches the original operating temperature range (-40°C to 85°C), while 25LC128-E/ST extends the upper temperature limit to 125°C for thermal margin applications. Both are active status products suitable for new designs.
25AA128-I/ST provides broader supply voltage tolerance (1.8V minimum) while maintaining 10 MHz clock frequency and identical operating temperature range. This part is appropriate when lower supply voltage operation is required.
Higher Performance Alternatives
AT25128B-XHL-B and AT25128B-XHL-T operate at 20 MHz clock frequency with 1.8V minimum supply voltage, providing performance headroom for timing-critical applications. Both are active status Microchip Technology products. The -B variant is supplied in tube packaging; the -T variant is supplied in cut tape and Digi-Reel format.
CAT25128YI-GT3 (onsemi) and M95128-DRDW3TP/K (STMicroelectronics) are active status alternatives with 20 MHz operation. M95128-DRDW3TP/K additionally provides extended temperature range (-40°C to 125°C) and faster write cycle time (4ms versus 5ms).
Automotive-Grade Selection
CAV25128YE-GT3 and M95128-DRDW3TP/K carry AEC-Q100 automotive qualification. CAV25128YE-GT3 maintains 10 MHz operation with extended temperature range. M95128-DRDW3TP/K provides 20 MHz operation with extended temperature range and faster write cycle time.
Legacy System Maintenance
CAT25128YI-G (onsemi, obsolete status) and BR25S128FV-WE2 (ROHM Semiconductor, not for new designs) are available for sustaining production of existing systems only. These parts should not be selected for new design implementations.
Frequently Asked Questions (FAQ)
Q: Can 25AA128-I/ST directly replace 25LC128X-I/ST in existing designs?
A: Yes. Both parts maintain 128Kbit capacity, 16K x 8 organization, SPI interface, 10 MHz clock frequency, 8-TSSOP packaging, and -40°C to 85°C operating temperature range. The 25AA128-I/ST provides extended supply voltage tolerance (1.8V minimum versus 2.5V minimum), making it functionally compatible. No circuit modifications are required.
Q: What is the difference between AT25128B-XHL-B and AT25128B-XHL-T?
A: Both parts are electrically identical 128Kbit SPI EEPROM devices with 20 MHz operation, 1.8V to 5.5V supply range, and 8-TSSOP packaging. The difference is packaging format: -B is supplied in tube packaging; -T is supplied in cut tape and Digi-Reel format. Selection depends on assembly process requirements and volume handling.
Q: Why does M95128-DRDW3TP/K have a 4ms write cycle time instead of 5ms?
A: M95128-DRDW3TP/K is manufactured by STMicroelectronics with optimized write cycle timing. The 4ms specification is a product characteristic and does not affect functional compatibility. Applications designed for 5ms write cycle time will operate correctly with this part.
Q: Can I use CAT25128YI-G for new product designs?
A: No. CAT25128YI-G carries obsolete product status. New designs must select from active status alternatives such as CAT25128YI-GT3, AT25128B-XHL-B, AT25128B-XHL-T, or M95128-DRDW3TP/K.
Q: What is the difference between standard and automotive-grade parts?
A: Automotive-grade parts (CAV25128YE-GT3, M95128-DRDW3TP/K) carry AEC-Q100 qualification, indicating compliance with automotive reliability and quality standards. These parts are suitable for automotive applications requiring enhanced qualification documentation. Standard-grade parts are appropriate for industrial and consumer applications.
Q: Is BR25S128FV-WE2 suitable for new designs?
A: No. BR25S128FV-WE2 carries "Not For New Designs" product status. This part is available for sustaining production of existing systems only. New designs must select from active status alternatives.
Q: Can I substitute a 20 MHz part for a 10 MHz requirement?
A: Yes. Parts rated for 20 MHz operation (AT25128B-XHL-B, AT25128B-XHL-T, CAT25128YI-GT3, M95128-DRDW3TP/K) are backward compatible with 10 MHz applications. The higher clock frequency rating provides performance margin without affecting functional operation at lower clock speeds.
Q: What supply voltage range should I verify before substitution?
A: Verify that the substitute part's minimum supply voltage specification does not exceed your circuit's minimum supply voltage. For example, if your circuit operates at 2.0V minimum, parts rated 1.8V minimum (25AA128-I/ST, AT25128B-XHL-B, AT25128B-XHL-T, BR25S128FV-WE2, CAT25128YI-G, CAT25128YI-GT3, M95128-DRDW3TP/K) are acceptable, but parts rated 2.5V minimum (25LC128-E/ST, 25LC128-I/ST, CAV25128YE-GT3) are not.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original 25LC128X-I/ST specification.
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