AT25080BY6-YH-T Equivalent & Substitute Parts

Part Overview

The AT25080BY6-YH-T is an 8Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface with 20 MHz clock frequency and 8-Mini Map (2x3) packaging. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The device operates across a supply voltage range of 1.8V to 5.5V with a write cycle time of 5ms and supports operating temperatures from -40°C to 85°C.

Key Parameters

Parameter	Value
Memory Size	8Kbit
Memory Organization	1K x 8
Memory Interface	SPI
Clock Frequency	20 MHz
Write Cycle Time	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UFDFN Exposed Pad
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the AT25080BY6-YH-T is determined by the following critical parameters: 8Kbit memory capacity, 1K x 8 organization, SPI interface, 5ms write cycle time, and 8-pin surface mount package with exposed pad. The substitute parts are grouped into two categories based on clock frequency compatibility:

Category 1: 20 MHz Clock Frequency (Direct Functional Equivalents) Parts maintaining the 20 MHz specification: AT25080B-MAHL-T, M95080-DFMC6TG, M95080-RMC6TG, and CAT25080HU4I-GT3. These provide identical performance characteristics with voltage supply ranges of 1.7V–5.5V to 1.8V–5.5V.

Category 2: 10 MHz Clock Frequency (Reduced Speed Alternatives) Parts with 10 MHz operation: 25AA080CT-I/MNY, 25AA080DT-I/MNY, 25LC080CT-E/MNY, 25LC080CT-I/MNY, 25LC080DT-E/MNY, and 25LC080DT-I/MNY. These maintain core memory specifications but operate at half the clock frequency. The 25LC0xx series supports extended operating temperature to 125°C.

All substitute parts maintain ROHS3 compliance, 8Kbit capacity, SPI interface, and 5ms write cycle time. Package variations exist between 8-UFDFN and 8-WFDFN formats, both with exposed pad configurations.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temp	Package	Product Status
AT25080BY6-YH-T	Microchip	8Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-UFDFN	Obsolete
AT25080B-MAHL-T	Microchip	8Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-UFDFN	Active
CAT25080HU4I-GT3	onsemi	8Kbit	Not Specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-UFDFN	Active
M95080-DFMC6TG	STMicroelectronics	8Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-UFDFN	Active
M95080-RMC6TG	STMicroelectronics	8Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-UFDFN	Active
25AA080CT-I/MNY	Microchip	8Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-WFDFN	Active
25AA080DT-I/MNY	Microchip	8Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-WFDFN	Active
25LC080CT-E/MNY	Microchip	8Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-WFDFN	Active
25LC080CT-I/MNY	Microchip	8Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-WFDFN	Active
25LC080DT-E/MNY	Microchip	8Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-WFDFN	Active
25LC080DT-I/MNY	Microchip	8Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-WFDFN	Active

Engineering Selection Recommendations

For applications requiring direct performance equivalence with the obsolete AT25080BY6-YH-T, select from active parts maintaining 20 MHz clock frequency: AT25080B-MAHL-T (Microchip), M95080-DFMC6TG or M95080-RMC6TG (STMicroelectronics), or CAT25080HU4I-GT3 (onsemi). All maintain identical memory capacity, SPI interface, write cycle time, and operating temperature range. All substitute options are ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity).

For applications where reduced clock frequency is acceptable, the 25AA080 and 25LC080 series provide active alternatives with 10 MHz operation. The 25LC080 variants support extended operating temperature to 125°C but require minimum supply voltage of 2.5V. The 25AA080 series maintains the 1.8V minimum supply voltage of the original part.

Package format differs between 8-UFDFN (original and 20 MHz substitutes) and 8-WFDFN (10 MHz alternatives), requiring PCB layout verification. All parts maintain 1K x 8 memory organization and 5ms write cycle time.

Frequently Asked Questions (FAQ)

Q: Can 10 MHz parts replace the 20 MHz AT25080BY6-YH-T? A: Yes, if system timing requirements permit. The 10 MHz parts (25AA080 and 25LC080 series) maintain identical memory capacity and SPI interface. Reduced clock frequency may impact data transfer rates in bandwidth-critical applications.

Q: What is the difference between 25AA080 and 25LC080 series? A: The 25LC080 series supports extended operating temperature to 125°C and requires minimum supply voltage of 2.5V. The 25AA080 series operates from 1.8V minimum, matching the original part's voltage range.

Q: Are package differences between 8-UFDFN and 8-WFDFN significant? A: Both are 8-pin surface mount packages with exposed pad in 2x3mm footprint. Physical dimensions and pin assignments are compatible, but PCB layout and thermal management characteristics may differ. Consult manufacturer datasheets for specific footprint requirements.

Q: Which substitute offers the highest inventory availability? A: M95080-RMC6TG (STMicroelectronics) with 66,300 pieces in stock, maintaining 20 MHz performance and 1.8V–5.5V supply range.

Q: Do all substitutes maintain ROHS3 compliance? A: Yes, all listed substitute parts are ROHS3 compliant with MSL rating of 1 (unlimited).

Q: What is the MSL difference between AT25080B-MAHL-T and AT25080BY6-YH-T? A: AT25080B-MAHL-T has MSL rating of 3 (168 hours), while the original part has MSL rating of 1 (unlimited). This affects moisture sensitivity handling during storage and assembly.

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