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Equivalent & Substitute Parts for 24LC32AX-E/ST
Part Overview
The 24LC32AX-E/ST is a 32Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 400 kHz with 900 ns access time. This device is packaged in 8-TSSOP surface mount configuration and operates across a supply voltage range of 2.5V to 5.5V with an extended temperature range of -40°C to 125°C. The part is currently in active product status with ROHS3 compliance and unlimited moisture sensitivity level rating.
Equivalent and substitute parts are identified based on matching core electrical parameters: 32Kbit memory capacity, I2C interface protocol, 4K x 8 memory organization, 5ms write cycle time, and compatible surface mount packaging. Substitutes may vary in clock frequency, access time, voltage supply range, and operating temperature specifications while maintaining functional compatibility for standard I2C EEPROM applications.
Substiute Parts
Key Parameters
| Parameter | 24LC32AX-E/ST |
|---|---|
| Memory Size | 32Kbit |
| Memory Organization | 4K x 8 |
| Memory Interface | I2C |
| Clock Frequency | 400 kHz |
| Access Time | 900 ns |
| Write Cycle Time | 5ms |
| Voltage Supply Range | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C |
| Package Type | 8-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts are classified based on adherence to the following core electrical and mechanical parameters that define functional compatibility:
Primary Matching Criteria:
- Memory Size: 32Kbit (mandatory)
- Memory Organization: 4K x 8 (mandatory)
- Memory Interface: I2C (mandatory)
- Write Cycle Time: 5ms (mandatory)
- Mounting Type: Surface Mount (mandatory)
- Package Category: 8-pin TSSOP, MSOP, or SSOP variants (compatible)
Secondary Variation Parameters:
- Clock Frequency: 400 kHz or 1 MHz (both acceptable for I2C standard)
- Access Time: 450 ns to 900 ns (performance variation)
- Voltage Supply Range: 1.6V ~ 5.5V to 2.5V ~ 5.5V (wider ranges acceptable)
- Operating Temperature: -40°C ~ 85°C or -40°C ~ 125°C (both acceptable)
Substitutes are grouped into two categories: Microchip Technology variants (24LC32A-E/ST) and cross-manufacturer alternatives (Rohm Semiconductor BR24 series, onsemi CAV24C32YE-GT3, and STMicroelectronics M24C32-DFDW6TP).
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Memory Organization | I2C Clock Frequency | Access Time | Voltage Supply | Operating Temperature | Package Type | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| 24LC32AX-E/ST | Microchip Technology | 32Kbit | 4K x 8 | 400 kHz | 900 ns | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-TSSOP | Active |
| 24LC32A-E/ST | Microchip Technology | 32Kbit | 4K x 8 | 400 kHz | 900 ns | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-TSSOP | Active |
| BR24G32FVJ-3GTE2 | Rohm Semiconductor | 32Kbit | 4K x 8 | 400 kHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP-BJ | Not For New Designs |
| BR24G32FVM-3AGTTR | Rohm Semiconductor | 32Kbit | 4K x 8 | 1 MHz | Not specified | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-MSOP | Active |
| BR24G32FVT-3AGE2 | Rohm Semiconductor | 32Kbit | 4K x 8 | 1 MHz | Not specified | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP-B | Active |
| BR24G32FVT-3GE2 | Rohm Semiconductor | 32Kbit | 4K x 8 | 400 kHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP-B | Active |
| BR24L32FV-WE2 | Rohm Semiconductor | 32Kbit | 4K x 8 | 400 kHz | Not specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-SSOP-B | Not For New Designs |
| BR24L32FVT-WE2 | Rohm Semiconductor | 32Kbit | 4K x 8 | 400 kHz | Not specified | 1.8V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP-B | Active |
| BR24T32FVM-WTR | Rohm Semiconductor | 32Kbit | 4K x 8 | 400 kHz | Not specified | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-MSOP | Active |
| CAV24C32YE-GT3 | onsemi | 32Kbit | 4K x 8 | 400 kHz | 900 ns | 2.5V ~ 5.5V | -40°C ~ 125°C | 8-TSSOP | Active |
| M24C32-DFDW6TP | STMicroelectronics | 32Kbit | 4K x 8 | 1 MHz | 450 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | Active |
Engineering Selection Recommendations
Direct Equivalent (Recommended for Pin-Compatible Replacement):
24LC32A-E/ST from Microchip Technology is the direct parametric equivalent to 24LC32AX-E/ST. Both parts share identical electrical specifications, packaging, and operating characteristics. This part maintains active product status and is suitable for direct substitution without design modification.
Cross-Manufacturer Alternatives with Active Product Status:
BR24G32FVT-3AGE2 and BR24G32FVT-3GE2 from Rohm Semiconductor are active products offering 32Kbit I2C EEPROM functionality in 8-TSSOP packaging. BR24G32FVT-3GE2 matches the 400 kHz clock frequency of the original part, while BR24G32FVT-3AGE2 operates at 1 MHz. Both support lower minimum voltage (1.6V to 1.7V) compared to the original 2.5V specification.
BR24L32FVT-WE2 from Rohm Semiconductor is an active product in 8-TSSOP-B packaging with 400 kHz operation and 1.8V minimum voltage specification. This part includes DiGi-Electronics programmable verification.
BR24T32FVM-WTR from Rohm Semiconductor is an active product in 8-MSOP packaging with 400 kHz operation and 1.6V minimum voltage specification.
CAV24C32YE-GT3 from onsemi is an active automotive-grade product (AEC-Q100 qualified) matching the original part's electrical specifications exactly: 400 kHz clock frequency, 900 ns access time, 2.5V to 5.5V supply range, and -40°C to 125°C operating temperature. This part is suitable for automotive applications requiring equivalent performance.
M24C32-DFDW6TP from STMicroelectronics is an active product offering enhanced performance with 1 MHz clock frequency and 450 ns access time in 8-TSSOP packaging. Supply voltage range is 1.7V to 5.5V with -40°C to 85°C operating temperature.
Parts Not Recommended for New Designs:
BR24G32FVJ-3GTE2 and BR24L32FV-WE2 carry "Not For New Designs" product status and should not be selected for new applications despite meeting core electrical parameters.
Frequently Asked Questions (FAQ)
Q: Can 24LC32A-E/ST replace 24LC32AX-E/ST directly?
A: Yes. Both parts are manufactured by Microchip Technology with identical electrical specifications, memory organization, I2C interface, clock frequency, access time, voltage supply range, operating temperature, and 8-TSSOP packaging. Direct substitution is possible without design modification.
Q: What is the difference between 400 kHz and 1 MHz clock frequency variants?
A: Clock frequency determines the maximum I2C bus speed. The original 24LC32AX-E/ST operates at 400 kHz (standard I2C speed). Substitutes offering 1 MHz operation (BR24G32FVT-3AGE2, M24C32-DFDW6TP) support faster I2C communication but remain backward compatible with 400 kHz bus implementations. System design must accommodate the selected frequency.
Q: Are Rohm Semiconductor BR24 series parts compatible with the original Microchip part?
A: BR24 series parts match the core 32Kbit I2C EEPROM specifications and are compatible at the functional level. However, they differ in packaging variants (8-TSSOP-B, 8-MSOP, 8-SSOP-B), voltage supply ranges, and operating temperature limits. Verify PCB layout compatibility with the specific package type before selection.
Q: What does "Not For New Designs" product status mean?
A: Parts marked "Not For New Designs" (BR24G32FVJ-3GTE2, BR24L32FV-WE2) are in mature or end-of-life phases. While functionally equivalent, these parts should not be selected for new product development. Active status parts are preferred for long-term supply assurance.
Q: Can I use CAV24C32YE-GT3 in automotive applications?
A: Yes. CAV24C32YE-GT3 is automotive-grade (AEC-Q100 qualified) with identical electrical specifications to the original 24LC32AX-E/ST. It is suitable for automotive applications requiring equivalent performance and compliance.
Q: What is the advantage of M24C32-DFDW6TP over the original part?
A: M24C32-DFDW6TP offers enhanced performance with 1 MHz clock frequency (versus 400 kHz) and faster 450 ns access time (versus 900 ns). It maintains 8-TSSOP packaging and ROHS3 compliance. The trade-off is a narrower operating temperature range (-40°C to 85°C versus -40°C to 125°C) and lower minimum voltage (1.7V versus 2.5V).
Q: Are there package compatibility considerations between 8-TSSOP and 8-MSOP variants?
A: Yes. 8-TSSOP (0.173", 4.40mm width) and 8-MSOP (0.110", 2.80mm width) have different physical dimensions and PCB footprints. Parts using 8-MSOP packaging (BR24G32FVM-3AGTTR, BR24T32FVM-WTR) require different PCB layout and cannot be used as direct pin-compatible replacements for 8-TSSOP designs without board redesign.
Q: What voltage supply range should I consider for substitute selection?
A: The original 24LC32AX-E/ST operates from 2.5V to 5.5V. Substitutes with wider ranges (1.6V to 5.5V or 1.7V to 5.5V) offer greater flexibility in low-voltage applications. Substitutes with narrower ranges (1.8V to 5.5V) are still compatible with standard 3.3V and 5V systems. Verify your system's supply voltage against the selected part's specification.
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