AT24C08BY6-YH-T Equivalent & Substitute Parts

Part Overview

The AT24C08BY6-YH-T is an 8Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This device operates at 1 MHz clock frequency with 550 ns access time and supports a supply voltage range of 1.8V to 5.5V. The part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. Equivalent parts must maintain identical memory capacity, I2C interface protocol, and compatible electrical specifications to ensure direct functional replacement.

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	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UFDFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Memory Capacity & Organization: All substitutes must provide 8Kbit capacity with 1K x 8 organization to maintain software compatibility
Interface Protocol: I2C interface is mandatory; no alternative protocols are acceptable
Electrical Compatibility: Supply voltage range must overlap with or exceed the original specification (1.8V ~ 5.5V minimum)
Package & Pinout: 8-UFDFN Exposed Pad package ensures mechanical and electrical compatibility
Operating Temperature: -40°C ~ 85°C range must be maintained
Compliance: RoHS3 compliance required for regulatory alignment

Substitutes are grouped into two categories based on clock frequency performance:

Category A - 1 MHz Operation (Direct Functional Equivalents)

AT24C08C-MAHM-T
AT24CS08-MAHM-E
AT24CS08-MAHM-T
BR24G08NUX-3ATTR

Category B - 400 kHz Operation (Reduced Speed Alternatives)

24AA08T-I/MNY
BR24G08NUX-3TTR
BR24L08NUX-WTR
BR24S08NUX-WTR
BR24T08NUX-WTR
CAT24C08HU4I-GT3

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package	Product Status	Inventory
AT24C08BY6-YH-T	Microchip Technology	8Kbit (1K x 8)	1 MHz	550 ns	1.8V ~ 5.5V	8-UFDFN	Obsolete	44131 Pcs
AT24C08C-MAHM-T	Microchip Technology	8Kbit (1K x 8)	1 MHz	550 ns	1.7V ~ 5.5V	8-UFDFN	Active	5400 Pcs
24AA08T-I/MNY	Microchip Technology	8Kbit (256 x 8 x 4)	400 kHz	900 ns	1.7V ~ 5.5V	8-WFDFN	Active	2014 Pcs
AT24CS08-MAHM-E	Microchip Technology	8Kbit (1K x 8)	1 MHz	550 ns	1.7V ~ 5.5V	8-UFDFN	Active	9913 Pcs
AT24CS08-MAHM-T	Microchip Technology	8Kbit (1K x 8)	1 MHz	550 ns	1.7V ~ 5.5V	8-UFDFN	Active	860 Pcs
BR24G08NUX-3ATTR	Rohm Semiconductor	8Kbit (1K x 8)	1 MHz	Not specified	1.6V ~ 5.5V	8-UFDFN	Active	5106 Pcs
BR24G08NUX-3TTR	Rohm Semiconductor	8Kbit (1K x 8)	400 kHz	Not specified	1.6V ~ 5.5V	8-UFDFN	Active	8000 Pcs
BR24L08NUX-WTR	Rohm Semiconductor	8Kbit (1K x 8)	400 kHz	Not specified	1.8V ~ 5.5V	8-UFDFN	Active	760 Pcs
BR24S08NUX-WTR	Rohm Semiconductor	8Kbit (1K x 8)	400 kHz	Not specified	1.7V ~ 5.5V	8-UFDFN	Active	686 Pcs
BR24T08NUX-WTR	Rohm Semiconductor	8Kbit (1K x 8)	400 kHz	Not specified	1.6V ~ 5.5V	8-UFDFN	Active	727 Pcs
CAT24C08HU4I-GT3	onsemi	8Kbit (1K x 8)	400 kHz	900 ns	1.7V ~ 5.5V	8-UFDFN	Active	18008 Pcs

Engineering Selection Recommendations

For Direct Replacement (1 MHz Operation)

AT24C08C-MAHM-T and AT24CS08-MAHM-E are the primary active substitutes maintaining 1 MHz clock frequency and 550 ns access time. Both are manufactured by Microchip Technology with RoHS3 compliance and active product status. AT24CS08-MAHM-E offers higher inventory availability (9913 Pcs) compared to AT24CS08-MAHM-T (860 Pcs). BR24G08NUX-3ATTR from Rohm Semiconductor provides equivalent 1 MHz performance with extended voltage range (1.6V ~ 5.5V) and unlimited moisture sensitivity rating.

For Reduced Speed Applications (400 kHz Operation)

When system timing permits 400 kHz I2C operation, CAT24C08HU4I-GT3 from onsemi offers the highest inventory availability (18008 Pcs) with verified programmability status. Rohm Semiconductor alternatives (BR24G08NUX-3TTR, BR24L08NUX-WTR, BR24S08NUX-WTR, BR24T08NUX-WTR) provide 400 kHz operation with varying voltage specifications. 24AA08T-I/MNY from Microchip Technology operates at 400 kHz with different memory organization (256 x 8 x 4) and package variant (8-WFDFN).

Compliance & Availability Considerations

All listed substitutes maintain RoHS3 compliance and REACH unaffected status. Microchip Technology parts (AT24C08C-MAHM-T, AT24CS08-MAHM-E, AT24CS08-MAHM-T) ensure manufacturer continuity. onsemi CAT24C08HU4I-GT3 carries verified programmability certification matching the original part's DiGi-Electronics verification status.

Frequently Asked Questions (FAQ)

Q: Can AT24C08BY6-YH-T be replaced with 24AA08T-I/MNY?

A: Functional replacement is possible with design considerations. Both devices provide 8Kbit I2C EEPROM with identical memory organization and 5ms write cycle time. However, 24AA08T-I/MNY operates at 400 kHz versus the original 1 MHz, resulting in 900 ns access time versus 550 ns. System I2C bus timing must accommodate the reduced clock frequency. Package variant differs (8-WFDFN versus 8-UFDFN), requiring PCB layout verification.

Q: What is the difference between AT24CS08-MAHM-E and AT24CS08-MAHM-T?

A: Both parts are electrically identical 8Kbit I2C EEPROMs with 1 MHz operation and 550 ns access time. The difference is packaging format: AT24CS08-MAHM-E is supplied in Tape & Reel (TR) format with 9913 Pcs inventory, while AT24CS08-MAHM-T is also Tape & Reel format with lower inventory (860 Pcs). Both maintain 1.7V ~ 5.5V supply range and -40°C ~ 85°C operating temperature.

Q: Are Rohm Semiconductor BR24 series parts pin-compatible with the original AT24C08BY6-YH-T?

A: Yes. All BR24 series substitutes (BR24G08NUX-3ATTR, BR24G08NUX-3TTR, BR24L08NUX-WTR, BR24S08NUX-WTR, BR24T08NUX-WTR) use 8-UFDFN Exposed Pad package matching the original pinout. Electrical interface compatibility is maintained through I2C protocol and identical memory organization (1K x 8). Voltage supply ranges vary by model but all support minimum 1.6V operation.

Q: Which substitute offers the best inventory availability?

A: CAT24C08HU4I-GT3 from onsemi provides the highest inventory (18008 Pcs) among all substitutes. This part operates at 400 kHz with 900 ns access time and carries verified programmability certification. For 1 MHz operation, AT24CS08-MAHM-E offers 9913 Pcs availability.

Q: Is moisture sensitivity a concern when selecting substitutes?

A: Moisture sensitivity levels vary among substitutes. The original AT24C08BY6-YH-T has MSL 1 (Unlimited). AT24C08C-MAHM-T and AT24CS08 variants specify MSL 3 (168 Hours), requiring controlled storage conditions. Rohm Semiconductor and onsemi parts maintain MSL 1 (Unlimited), matching the original specification. Selection depends on storage and handling capabilities in your supply chain.

Q: Can I use BR24G08NUX-3TTR as a direct replacement for 1 MHz applications?

A: No. BR24G08NUX-3TTR operates at 400 kHz, not 1 MHz. For applications requiring 1 MHz I2C bus speed, use BR24G08NUX-3ATTR instead, which maintains 1 MHz operation. Verify system I2C timing requirements before selecting 400 kHz alternatives.

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