AT24CS02-MAHM-E EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT24CS02-MAHM-E is a 2Kbit I2C EEPROM memory IC manufactured by Microchip Technology, supplied in an 8-UDFN (2x3) surface mount package. This non-volatile memory device operates at 1 MHz clock frequency with 550 ns access time and supports a supply voltage range of 1.7V to 5.5V across an operating temperature range of -40°C to 85°C. The part is ROHS3 compliant and currently in active production status. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, electrical specifications, and package compatibility to ensure functional interchangeability in circuit designs.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	2Kbit
Memory Organization	256 x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UDFN Exposed Pad (2x3)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the AT24CS02-MAHM-E are classified into two categories based on substitution criteria:

Category 1: Direct Parametric Equivalents (Same Package, Same Clock Frequency) These parts maintain identical electrical specifications and package format. Substitution is based on matching: 2Kbit memory capacity, 256 x 8 organization, I2C interface, 1 MHz clock frequency, 550 ns access time, 5 ms write cycle time, 1.7V–5.5V supply voltage, -40°C to 85°C operating temperature, and 8-UDFN package with exposed pad. Differences exist only in packaging format (Tape & Reel vs. Cut Tape) and base product series designation.

Category 2: Functional Equivalents (Same Package, Reduced Clock Frequency) These parts provide functional compatibility with relaxed timing specifications. Substitution is based on matching: 2Kbit memory capacity, 256 x 8 organization, I2C interface, 1.7V–5.5V supply voltage, -40°C to 85°C operating temperature, and 8-UDFN package. Clock frequency is reduced to 400 kHz and access time is increased to 900 ns, which does not affect functional interchangeability in standard I2C applications.

Category 3: Alternative Package Format (Same Electrical Specs, Different Package) The AT24CS02-SSHM-T provides identical electrical specifications in an 8-SOIC package format, suitable for applications requiring larger pitch spacing or different PCB layout requirements.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Package Type	Supply Voltage	Operating Temp	RoHS Status	MSL Rating
AT24CS02-MAHM-E	Microchip	2Kbit	1 MHz	550 ns	8-UDFN	1.7V–5.5V	-40°C–85°C	ROHS3	3
AT24CS02-SSHM-T	Microchip	2Kbit	1 MHz	550 ns	8-SOIC	1.7V–5.5V	-40°C–85°C	ROHS3	1
AT34C02D-MAHM-T	Microchip	2Kbit	1 MHz	Not specified	8-UDFN	1.7V–5.5V	-40°C–85°C	ROHS3	3
AT24C02C-MAHM-E	Microchip	2Kbit	1 MHz	550 ns	8-UDFN	1.7V–5.5V	-40°C–85°C	ROHS3	3
AT24C02C-MAHM-T	Microchip	2Kbit	1 MHz	550 ns	8-UDFN	1.7V–5.5V	-40°C–85°C	ROHS3	3
AT24CS02-MAHM-T	Microchip	2Kbit	1 MHz	550 ns	8-UDFN	1.7V–5.5V	-40°C–85°C	ROHS3	3
AT24MAC602-MAHM-T	Microchip	2Kbit	1 MHz	550 ns	8-UDFN	1.7V–5.5V	-40°C–85°C	ROHS3	3
BR24T02NUX-WTR	Rohm Semiconductor	2Kbit	400 kHz	Not specified	8-UFDFN	1.6V–5.5V	-40°C–85°C	ROHS3	1
CAT34C02HU4IGT4A	onsemi	2Kbit	400 kHz	900 ns	8-UDFN-EP	1.7V–5.5V	-40°C–85°C	ROHS3	1
M24C02-FMC6TG	STMicroelectronics	2Kbit	400 kHz	900 ns	8-UFDFPN	1.7V–5.5V	-40°C–85°C	ROHS3	1
M34E02-FMC6TG	STMicroelectronics	2Kbit	400 kHz	900 ns	8-UFDFPN	1.7V–5.5V	-40°C–85°C	ROHS3	1

Engineering Selection Recommendations

For Direct Replacement (Same Performance Profile): AT24C02C-MAHM-E, AT24C02C-MAHM-T, AT24CS02-MAHM-T, and AT24MAC602-MAHM-T are direct parametric equivalents. All maintain 1 MHz clock frequency, 550 ns access time, and identical electrical specifications. Selection between these parts depends on packaging format requirements (Tape & Reel vs. Cut Tape) and inventory availability. All are ROHS3 compliant with active product status.

For Package Format Variation: AT24CS02-SSHM-T provides identical electrical performance in an 8-SOIC package. This option is suitable when PCB layout or assembly equipment requires larger pitch spacing. MSL rating improves to 1 (Unlimited) compared to the original part's MSL 3 rating.

For Relaxed Timing Applications: BR24T02NUX-WTR (Rohm Semiconductor), CAT34C02HU4IGT4A (onsemi), M24C02-FMC6TG, and M34E02-FMC6TG (STMicroelectronics) operate at 400 kHz clock frequency with 900 ns access time. These parts are functionally compatible in standard I2C applications where reduced clock speed does not impact system performance. All feature improved MSL ratings (1 vs. 3) and active product status. BR24T02NUX-WTR supports a lower minimum supply voltage of 1.6V.

Compliance Considerations: All listed substitute parts maintain ROHS3 compliance and active production status, ensuring long-term availability and regulatory alignment with the original AT24CS02-MAHM-E specification.

Frequently Asked Questions (FAQ)

Q: Can AT24CS02-SSHM-T replace AT24CS02-MAHM-E directly on the PCB? A: Electrical substitution is direct; however, the package format differs (8-SOIC vs. 8-UDFN). PCB footprint and assembly process must accommodate the larger 8-SOIC package. Pin configuration remains compatible for I2C interface connections.

Q: What is the impact of using a 400 kHz I2C device instead of 1 MHz? A: Clock frequency reduction from 1 MHz to 400 kHz does not affect functional compatibility in standard I2C applications. The I2C protocol supports both speeds. System performance impact depends on application-specific timing requirements. Access time increases from 550 ns to 900 ns, which remains within acceptable limits for typical I2C memory operations.

Q: Are all substitute parts suitable for -40°C to 85°C operating range? A: Yes. All listed substitute parts support the full -40°C to 85°C operating temperature range specified for the original AT24CS02-MAHM-E.

Q: What does MSL rating difference mean for component handling? A: MSL (Moisture Sensitivity Level) 3 requires storage at controlled humidity for 168 hours before reflow soldering. MSL 1 (Unlimited) has no moisture sensitivity restrictions. Lower MSL ratings provide greater handling flexibility and reduced risk of moisture-induced defects during assembly.

Q: Can I use M24C02-FMC6TG or M34E02-FMC6TG as drop-in replacements? A: These STMicroelectronics parts are functionally compatible with identical memory capacity and I2C interface. Package format is 8-UFDFPN (similar to 8-UDFN). Verify PCB footprint compatibility before substitution. Clock frequency is 400 kHz instead of 1 MHz.

Q: Which substitute offers the best availability? A: AT34C02D-MAHM-T shows the highest inventory level (500,100 pcs) among all listed parts, providing superior supply chain security for high-volume applications.

Q: Are all parts ROHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance status, ensuring regulatory alignment with environmental and hazardous substance restrictions.

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