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AT34C02D-XHM-T Equivalent & Substitute Parts
Part Overview
The AT34C02D-XHM-T is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz clock frequency in an 8-TSSOP surface mount package. This part is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the memory capacity, interface protocol, voltage supply range, operating temperature, and package form factor.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Memory Size | 2Kbit |
| Memory Organization | 256 x 8 |
| Memory Interface | I2C |
| Clock Frequency | 1 MHz |
| Write Cycle Time - Word, Page | 5ms |
| Voltage - Supply | 1.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 8-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict adherence to the following parameters:
- Memory capacity must remain 2Kbit with 256 x 8 organization
- I2C interface protocol is mandatory
- Voltage supply range must encompass or match 1.7V ~ 5.5V
- Operating temperature range must support -40°C ~ 85°C minimum
- Package must be 8-TSSOP form factor with 0.173" width (4.40mm)
- Surface mount mounting type is required
- Write cycle time of 5ms is acceptable
- ROHS3 compliance is required
Substitute parts are grouped into two categories: direct equivalents operating at 1 MHz clock frequency, and compatible alternatives operating at 400 kHz clock frequency with equivalent access time performance.
Parameter Comparison
| Part Number | Manufacturer | Memory Size | Clock Frequency | Access Time | Voltage Supply | Operating Temp | Package | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| AT34C02D-XHM-T | Microchip Technology | 2Kbit | 1 MHz | — | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | ROHS3 |
| 24AA024T-I/ST | Microchip Technology | 2Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | ROHS3 |
| 24AA02T-I/ST | Microchip Technology | 2Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | ROHS3 |
| 34AA02T-E/ST | Microchip Technology | 2Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 125°C | 8-TSSOP | ROHS3 |
| AT24CS02-XHM-T | Microchip Technology | 2Kbit | 1 MHz | 550 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | ROHS3 |
| AT24HC02C-XHM-T | Microchip Technology | 2Kbit | 1 MHz | 550 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | ROHS3 |
| BR24G02FVT-3AGE2 | Rohm Semiconductor | 2Kbit | 1 MHz | — | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | ROHS3 |
| BR24G02FVT-3GE2 | Rohm Semiconductor | 2Kbit | 400 kHz | — | 1.6V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | ROHS3 |
| BR34E02FVT-3E2 | Rohm Semiconductor | 2Kbit | 400 kHz | — | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | ROHS3 |
| CAT34C02YI-GT5A | onsemi | 2Kbit | 400 kHz | 900 ns | 1.7V ~ 5.5V | -40°C ~ 85°C | 8-TSSOP | ROHS3 |
Engineering Selection Recommendations
All listed substitute parts maintain Active product status and ROHS3 compliance. Selection between 1 MHz and 400 kHz variants depends on system clock requirements. Microchip Technology parts AT24CS02-XHM-T and AT24HC02C-XHM-T provide direct 1 MHz operation matching the original specification. Rohm Semiconductor BR24G02FVT-3AGE2 offers 1 MHz operation with extended voltage floor of 1.6V. For 400 kHz applications, Microchip 24AA024T-I/ST, 24AA02T-I/ST, and onsemi CAT34C02YI-GT5A are functionally equivalent. The 34AA02T-E/ST variant extends operating temperature to -40°C ~ 125°C while maintaining 400 kHz operation. All parts are available in 8-TSSOP surface mount packaging with identical mechanical footprint.
Frequently Asked Questions (FAQ)
Q: Can I substitute a 400 kHz part for the 1 MHz AT34C02D-XHM-T?
A: Yes, if system timing requirements permit. The 400 kHz variants (24AA024T-I/ST, 24AA02T-I/ST, CAT34C02YI-GT5A) maintain identical memory capacity, I2C protocol, voltage supply range, and operating temperature. Clock frequency reduction does not affect memory functionality in I2C applications where the host controller manages bus timing.
Q: Are all substitute parts pin-compatible?
A: All listed parts use the 8-TSSOP package with identical 0.173" width (4.40mm). Pin configuration for I2C EEPROM devices in this package is standardized. Physical and electrical compatibility is maintained across all substitutes.
Q: What is the difference between Microchip and Rohm variants?
A: Microchip parts (AT34C02D, AT24CS02, AT24HC02C, 24AA series) and Rohm parts (BR24G02, BR34E02) are functionally equivalent within their respective clock frequency classes. Rohm BR24G02FVT-3AGE2 operates at 1 MHz with minimum supply voltage of 1.6V versus 1.7V for Microchip equivalents. Selection is based on availability and supply chain requirements.
Q: Does operating temperature range affect substitution eligibility?
A: The 34AA02T-E/ST extends operating temperature to -40°C ~ 125°C, exceeding the original -40°C ~ 85°C specification. This part is suitable for applications requiring higher temperature operation. Parts with identical or broader temperature ranges are substitutable.
Q: What packaging options are available?
A: All substitute parts listed are available in 8-TSSOP surface mount package. CAT34C02HU4IGT4A is available in 8-UDFN-EP (2x3) alternative package form factor, which is not mechanically compatible with 8-TSSOP footprints.
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