AT24CS64-MAHM-E Equivalent & Substitute Parts

Part Overview

The AT24CS64-MAHM-E is a 64Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz with 550 ns access time. The device is packaged in 8-UDFN (2x3) with exposed pad, suitable for surface mount applications across industrial and commercial temperature ranges (-40°C to 85°C). This part is currently active in production with 1091 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the allowed parameter set.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K 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

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Memory capacity: 64Kbit
Memory organization: 8K x 8
Interface protocol: I2C
Operating voltage range: 1.7V ~ 5.5V minimum, 5.5V maximum
Temperature range: -40°C ~ 85°C
Package classification: 8-pin UDFN with exposed pad, 2x3 mm footprint
Mounting technology: Surface mount

Substitute parts are grouped by manufacturer and packaging format. All listed substitutes maintain electrical equivalence within the specified parameter boundaries. Variations in access time, clock frequency tolerance, and moisture sensitivity level do not disqualify substitution when core memory and interface specifications remain identical.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package	Packaging Format	Inventory
AT24CS64-MAHM-E	Microchip Technology	64Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-UDFN (2x3)	Tape & Reel	1091 Pcs
AT24C64D-MAHM-T	Microchip Technology	64Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-Mini Map (2x3)	Cut Tape & Digi-Reel	4140 Pcs
AT24CS64-MAHM-T	Microchip Technology	64Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-UDFN (2x3)	Cut Tape & Digi-Reel	3593 Pcs
BR24G64NUX-3ATTR	Rohm Semiconductor	64Kbit	1 MHz	Not specified	1.7V ~ 5.5V	VSON008X2030	Tape & Reel	17795 Pcs
BR24G64NUX-3TTR	Rohm Semiconductor	64Kbit	400 kHz	Not specified	1.6V ~ 5.5V	VSON008X2030	Tape & Reel	53100 Pcs
CAT24C64HU4I-GT3	onsemi	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	8-UDFN-EP (2x3)	Tape & Reel	9599 Pcs
M24C64-DFMC6TG	STMicroelectronics	64Kbit	1 MHz	450 ns	1.7V ~ 5.5V	8-UFDFPN (2x3)	Tape & Reel	14000 Pcs
M24C64-FMC6TG	STMicroelectronics	64Kbit	1 MHz	450 ns	1.7V ~ 5.5V	8-UFDFPN (2x3)	Cut Tape & Digi-Reel	65300 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance. Selection between substitutes depends on packaging format availability and supply chain requirements:

Microchip Technology AT24CS64-MAHM-T and AT24C64D-MAHM-T are direct Microchip alternatives with identical electrical specifications. The AT24CS64-MAHM-T maintains the same 8-UDFN package footprint as the primary part but in Cut Tape & Digi-Reel format. The AT24C64D-MAHM-T uses 8-Mini Map packaging, which differs mechanically and requires PCB layout verification.

Rohm Semiconductor BR24G64NUX-3ATTR operates at 1 MHz with VSON008X2030 packaging. The BR24G64NUX-3TTR variant operates at 400 kHz with expanded lower voltage support (1.6V minimum) and represents a lower-speed alternative with significantly higher inventory availability.

onsemi CAT24C64HU4I-GT3 provides improved access time performance at 400 ns while maintaining 1 MHz operation and identical voltage specifications.

STMicroelectronics M24C64-DFMC6TG and M24C64-FMC6TG offer 450 ns access time with 8-UFDFPN packaging. The M24C64-FMC6TG in Cut Tape & Digi-Reel format provides the highest inventory level at 65300 units.

Frequently Asked Questions (FAQ)

Q: Can BR24G64NUX-3TTR be used as a direct substitute for AT24CS64-MAHM-E?

A: BR24G64NUX-3TTR maintains 64Kbit capacity, 8K x 8 organization, and I2C interface. However, it operates at 400 kHz clock frequency versus the primary part's 1 MHz, and minimum supply voltage is 1.6V versus 1.7V. These differences require system-level verification of timing requirements and power supply specifications before substitution.

Q: What is the difference between 8-UDFN and VSON008X2030 packages?

A: Both are 8-pin surface mount packages with 2x3 mm footprint dimensions. VSON008X2030 is Rohm's package designation for functionally equivalent 8-pin packages. PCB layout compatibility depends on specific pad geometry and thermal via requirements defined in manufacturer datasheets.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance certification. Moisture sensitivity levels vary between MSL 1 (Unlimited) and MSL 3 (168 Hours), which affects storage and handling requirements but does not impact electrical substitution eligibility.

Q: Which substitute offers the best access time performance?

A: CAT24C64HU4I-GT3 provides 400 ns access time, compared to 550 ns for the primary part and 450 ns for STMicroelectronics alternatives. Improved access time does not affect I2C protocol compatibility and represents a performance enhancement for timing-critical applications.

Q: Can I substitute based on packaging format alone?

A: No. Packaging format changes require PCB layout redesign and thermal management verification. Electrical parameter equivalence across memory capacity, interface protocol, voltage range, and temperature rating must be confirmed before any substitution, regardless of package type.

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