AT24CS08-MAHM-T EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT24CS08-MAHM-T is an 8Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz with 550 ns access time. This non-volatile memory device is packaged in 8-UDFN (2x3) surface mount configuration and operates across a wide supply voltage range of 1.7V to 5.5V with temperature range -40°C to 85°C. The part is currently in active production status with ROHS3 compliance and MSL 3 rating. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, electrical specifications, and package compatibility to ensure direct functional replacement in circuit applications.

Key Parameters

Parameter	Value
Memory Size	8Kbit
Memory Organization	1K 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 (2x3)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the AT24CS08-MAHM-T are classified based on strict parameter matching across the following critical criteria:

Primary Equivalence Parameters:

Memory Size: 8Kbit
Memory Organization: 1K x 8
Memory Interface: I2C
Write Cycle Time: 5ms
Voltage Supply Range: 1.7V ~ 5.5V or 1.6V ~ 5.5V
Operating Temperature: -40°C ~ 85°C
Package Type: 8-UDFN Exposed Pad
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Variation Parameters:

Clock Frequency: 1 MHz (primary) or 400 kHz (acceptable substitute)
Access Time: 550 ns (primary) or 900 ns (acceptable substitute)
Packaging Format: Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel®
MSL Rating: 3 (168 Hours) or 1 (Unlimited)

Substitutes are grouped into Microchip Technology parametric equivalents (AT24C08C and AT24CS08 series) and manufacturer-recommended alternatives from Rohm Semiconductor, onsemi, and STMicroelectronics that maintain full electrical and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package	Packaging Format	MSL Rating	Product Status
AT24CS08-MAHM-T	Microchip Technology	8Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-UDFN (2x3)	Tape & Reel (TR)	3 (168 Hours)	Active
AT24C08C-MAHM-E	Microchip Technology	8Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-UDFN (2x3)	Tape & Reel (TR)	3 (168 Hours)	Active
AT24C08C-MAHM-T	Microchip Technology	8Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-UDFN (2x3)	Cut Tape (CT) & Digi-Reel®	3 (168 Hours)	Active
AT24CS08-MAHM-E	Microchip Technology	8Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-UDFN (2x3)	Tape & Reel (TR)	3 (168 Hours)	Active
BR24G08NUX-3ATTR	Rohm Semiconductor	8Kbit	1 MHz	Not Specified	1.6V ~ 5.5V	8-UDFN Exposed Pad	Tape & Reel (TR)	1 (Unlimited)	Active
BR24G08NUX-3TTR	Rohm Semiconductor	8Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	8-UDFN Exposed Pad	Tape & Reel (TR)	1 (Unlimited)	Active
CAT24C08HU4I-GT3	onsemi	8Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-UDFN-EP (2x3)	Cut Tape (CT) & Digi-Reel®	1 (Unlimited)	Active
M24C08-FMC6TG	STMicroelectronics	8Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-UDFN Exposed Pad	Cut Tape (CT) & Digi-Reel®	1 (Unlimited)	Active

Engineering Selection Recommendations

Microchip Technology AT24C08C Series (Parametric Equivalents)

The AT24C08C-MAHM-E and AT24C08C-MAHM-T parts provide direct parametric equivalence to the AT24CS08-MAHM-T across all critical electrical and mechanical specifications. Both variants maintain 1 MHz clock frequency, 550 ns access time, and identical voltage supply range. The primary distinction is packaging format: AT24C08C-MAHM-E is supplied in Tape & Reel format while AT24C08C-MAHM-T is supplied in Cut Tape & Digi-Reel® format. Both are ROHS3 compliant with MSL 3 rating and active production status. These parts are recommended for direct substitution when packaging format flexibility is available.

Microchip Technology AT24CS08-MAHM-E (Parametric Equivalent)

The AT24CS08-MAHM-E is electrically and mechanically identical to the AT24CS08-MAHM-T with the exception of packaging format. This part is supplied in Tape & Reel format and maintains all electrical specifications including 1 MHz operation and 550 ns access time. Selection between -MAHM-T and -MAHM-E variants depends solely on packaging and supply chain requirements.

Rohm Semiconductor BR24G08 Series (Manufacturer-Recommended Alternatives)

The BR24G08NUX-3ATTR and BR24G08NUX-3TTR parts are manufacturer-recommended alternatives from Rohm Semiconductor. Both maintain 8Kbit capacity, I2C interface, 5ms write cycle time, and -40°C to 85°C operating temperature. The BR24G08NUX-3ATTR operates at 1 MHz matching the primary part's clock frequency, while BR24G08NUX-3TTR operates at 400 kHz. Both feature lower MSL rating (1 vs. 3) and extended voltage supply range (1.6V minimum vs. 1.7V). These parts are suitable for applications where lower moisture sensitivity is beneficial.

onsemi CAT24C08HU4I-GT3 (Manufacturer-Recommended Alternative)

The CAT24C08HU4I-GT3 from onsemi is a manufacturer-recommended substitute with verified DiGi-Electronics programmability. This part operates at 400 kHz clock frequency with 900 ns access time, representing acceptable performance trade-offs. It maintains 1.7V to 5.5V supply range and -40°C to 85°C operating temperature with MSL 1 rating. The part is supplied in Cut Tape & Digi-Reel® format.

STMicroelectronics M24C08-FMC6TG (Manufacturer-Recommended Alternative)

The M24C08-FMC6TG from STMicroelectronics is a manufacturer-recommended substitute operating at 400 kHz with 900 ns access time. This part maintains full voltage and temperature compatibility with MSL 1 rating and is supplied in Cut Tape & Digi-Reel® format. Selection is appropriate when lower clock frequency operation is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can I substitute AT24C08C-MAHM-T for AT24CS08-MAHM-T?

A: Yes. The AT24C08C-MAHM-T is a parametric equivalent with identical electrical specifications including 1 MHz clock frequency, 550 ns access time, 1.7V to 5.5V supply range, and -40°C to 85°C operating temperature. Both are packaged in 8-UDFN (2x3) with ROHS3 compliance. The primary difference is packaging format: AT24C08C-MAHM-T is supplied in Cut Tape & Digi-Reel® while AT24CS08-MAHM-T is supplied in Tape & Reel.

Q: What is the difference between 1 MHz and 400 kHz clock frequency variants?

A: Clock frequency determines the maximum I2C bus speed. The primary part AT24CS08-MAHM-T operates at 1 MHz, while alternatives such as CAT24C08HU4I-GT3 and M24C08-FMC6TG operate at 400 kHz. Both frequencies are compatible with standard I2C protocols. Selection depends on system I2C bus speed requirements. Lower frequency parts are suitable for applications operating at 400 kHz or below.

Q: Are there differences in access time between substitute parts?

A: Yes. The AT24CS08-MAHM-T and Microchip AT24C08C series specify 550 ns access time. The onsemi CAT24C08HU4I-GT3 and STMicroelectronics M24C08-FMC6TG specify 900 ns access time. The Rohm BR24G08 series does not specify access time in provided data. For timing-critical applications, verify that 900 ns access time meets system requirements before substitution.

Q: What does MSL rating mean and why does it vary?

A: MSL (Moisture Sensitivity Level) indicates the maximum time a component can be exposed to ambient conditions before soldering. MSL 3 (168 Hours) applies to Microchip parts, while MSL 1 (Unlimited) applies to Rohm, onsemi, and STMicroelectronics alternatives. MSL 1 provides greater flexibility in storage and handling. Selection depends on manufacturing process and storage conditions.

Q: Can I use BR24G08NUX-3TTR (400 kHz) in place of BR24G08NUX-3ATTR (1 MHz)?

A: Both are Rohm alternatives with identical memory capacity and electrical specifications except clock frequency. BR24G08NUX-3TTR operates at 400 kHz while BR24G08NUX-3ATTR operates at 1 MHz. Substitution is valid only if the application I2C bus operates at 400 kHz or lower. Verify system I2C speed compatibility before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts including Microchip AT24C08C series, Rohm BR24G08 series, onsemi CAT24C08HU4I-GT3, and STMicroelectronics M24C08-FMC6TG are ROHS3 compliant. All parts are also REACH unaffected with EAR99 ECCN classification.

Q: What is the voltage supply range difference between manufacturers?

A: Microchip and onsemi parts specify 1.7V to 5.5V supply range. Rohm BR24G08 series specifies 1.6V to 5.5V, providing 0.1V lower minimum voltage. For applications operating near 1.6V, Rohm alternatives offer extended compatibility. Standard 3.3V and 5V systems are compatible with all listed parts.

Q: Which substitute part has the best availability?

A: Based on provided inventory data, onsemi CAT24C08HU4I-GT3 has 18,008 pieces in stock, followed by Microchip AT24C08C-MAHM-E with 15,814 pieces. Rohm BR24G08NUX-3TTR has 8,000 pieces and STMicroelectronics M24C08-FMC6TG has 7,603 pieces. Availability should be verified with current supplier data for specific procurement timelines.

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