AT24CS32-MAHM-E Equivalent & Substitute Parts

Part Overview

The AT24CS32-MAHM-E is a 32Kbit 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) surface mount configuration and operates across a supply voltage range of 1.7V to 5.5V with temperature range of -40°C to 85°C. This part maintains Active product status and carries ROHS3 compliance certification. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, lead time considerations, or specific application performance parameters.

Key Parameters

Parameter	Value
Memory Size	32Kbit
Memory Organization	4K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UDFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the AT24CS32-MAHM-E are classified based on strict parametric equivalence across the following critical parameters: Memory Size (32Kbit), Memory Organization (4K x 8), Memory Interface (I2C), Write Cycle Time (5ms), Voltage Supply Range compatibility, Operating Temperature Range (-40°C to 85°C), and Surface Mount packaging in 8-pin UDFN configuration.

Microchip Technology variants (AT24C32D-MAHM-E, AT24C32D-MAHM-T, AT24CS32-MAHM-T) maintain identical electrical specifications and differ only in packaging format (Tape & Reel versus Cut Tape) and inventory availability.

Rohm Semiconductor parts (BR24G32NUX-3TTR, BR24S32NUX-WTR, BR24T32NUX-WTR) operate at 400 kHz clock frequency with voltage supply range of 1.6V to 5.5V, maintaining all other critical parameters including 32Kbit capacity, I2C interface, 5ms write cycle time, and -40°C to 85°C operating temperature. These devices feature MSL rating of 1 (Unlimited).

onsemi CAT24C32HU4I-GT3 operates at 1 MHz with 400 ns access time, matching the primary clock frequency specification while providing improved access performance. Voltage supply range is 1.7V to 5.5V with MSL rating of 1 (Unlimited).

STMicroelectronics parts (M24C32-DFMC6TG, M24C32-FMC6TG) operate at 1 MHz with 450 ns access time, maintaining 32Kbit capacity, I2C interface, and -40°C to 85°C operating temperature. Voltage supply range is 1.7V to 5.5V with MSL rating of 1 (Unlimited).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	MSL Rating	Inventory (Pcs)
AT24CS32-MAHM-E	Microchip Technology	32Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-UDFN	3	14475
AT24C32D-MAHM-E	Microchip Technology	32Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-UDFN	3	5300
AT24C32D-MAHM-T	Microchip Technology	32Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-UDFN	3	10200
AT24CS32-MAHM-T	Microchip Technology	32Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-UDFN	3	29186
BR24G32NUX-3TTR	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	VSON008X2030	1	53400
BR24S32NUX-WTR	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	VSON008X2030	1	4981
BR24T32NUX-WTR	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	VSON008X2030	1	4200
CAT24C32HU4I-GT3	onsemi	32Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-UDFN-EP	1	44300
M24C32-DFMC6TG	STMicroelectronics	32Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-UFDFPN	1	1210
M24C32-FMC6TG	STMicroelectronics	32Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-UFDFPN	1	18269

Engineering Selection Recommendations

Selection among equivalent parts should be based on the following criteria:

Microchip Technology Variants (AT24C32D-MAHM-E, AT24C32D-MAHM-T, AT24CS32-MAHM-T): These parts provide direct parametric equivalence to the AT24CS32-MAHM-E with identical electrical specifications. Selection between these variants depends on packaging format requirements (Tape & Reel versus Cut Tape) and inventory availability. All maintain ROHS3 compliance and MSL rating of 3.

Rohm Semiconductor Parts (BR24G32NUX-3TTR, BR24S32NUX-WTR, BR24T32NUX-WTR): These devices operate at reduced clock frequency (400 kHz versus 1 MHz) and feature improved MSL rating of 1 (Unlimited). The lower clock frequency may impact I2C bus timing in applications requiring 1 MHz operation. BR24G32NUX-3TTR offers highest inventory availability (53400 Pcs). Voltage supply range extends to 1.6V minimum for BR24G32NUX-3TTR and BR24T32NUX-WTR.

onsemi CAT24C32HU4I-GT3: This device matches 1 MHz clock frequency specification with improved access time of 400 ns (versus 550 ns). MSL rating of 1 (Unlimited) provides superior moisture handling. High inventory availability (44300 Pcs) supports rapid procurement.

STMicroelectronics Parts (M24C32-DFMC6TG, M24C32-FMC6TG): These devices operate at 1 MHz with access time of 450 ns, providing intermediate performance between the primary part and Rohm alternatives. MSL rating of 1 (Unlimited) and ROHS3 compliance are maintained. M24C32-FMC6TG offers superior inventory availability (18269 Pcs).

All substitute parts maintain ROHS3 compliance, -40°C to 85°C operating temperature range, 32Kbit capacity, 4K x 8 organization, I2C interface, and 5ms write cycle time.

Frequently Asked Questions (FAQ)

Q: Can AT24C32D-MAHM-E replace AT24CS32-MAHM-E directly?

A: Yes. Both parts are manufactured by Microchip Technology with identical electrical specifications including 1 MHz clock frequency, 550 ns access time, 32Kbit capacity, I2C interface, and -40°C to 85°C operating temperature. The primary difference is packaging format (Tape & Reel versus Cut Tape). Both maintain ROHS3 compliance.

Q: What is the impact of using Rohm Semiconductor BR24 series parts?

A: Rohm BR24G32NUX-3TTR, BR24S32NUX-WTR, and BR24T32NUX-WTR operate at 400 kHz clock frequency instead of 1 MHz. This reduced frequency may affect I2C bus timing in applications designed for 1 MHz operation. These parts feature improved MSL rating of 1 (Unlimited) versus MSL 3 on the primary part. Voltage supply range is 1.6V to 5.5V or 1.7V to 5.5V depending on variant.

Q: Are package differences between 8-UDFN and VSON008X2030 significant?

A: Both package types are 8-pin surface mount configurations with exposed pad design. Physical dimensions and pin layouts differ between manufacturers. PCB layout and footprint design must accommodate the specific package type. Rohm VSON008X2030 and Microchip/onsemi/STMicroelectronics UDFN packages are not interchangeable without PCB redesign.

Q: Which substitute part offers the best access time performance?

A: onsemi CAT24C32HU4I-GT3 provides 400 ns access time, which is the fastest among all listed parts. STMicroelectronics M24C32 series offers 450 ns access time. The primary AT24CS32-MAHM-E specifies 550 ns access time.

Q: What is the significance of MSL rating differences?

A: MSL (Moisture Sensitivity Level) rating indicates moisture handling requirements during storage and assembly. MSL 3 (168 Hours) requires more stringent moisture control than MSL 1 (Unlimited). Parts with MSL 1 rating (Rohm, onsemi, STMicroelectronics) offer greater flexibility in storage and handling conditions compared to the primary part with MSL 3 rating.

Q: Can I use M24C32-FMC6TG in high-volume production?

A: Yes. M24C32-FMC6TG maintains 32Kbit capacity, I2C interface, 1 MHz clock frequency, -40°C to 85°C operating temperature, and ROHS3 compliance. Inventory availability of 18269 Pcs supports production requirements. Access time of 450 ns is faster than the primary part specification of 550 ns.

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