AT25080B-TH-B Equivalent & Substitute Parts

Part Overview

The AT25080B-TH-B is an 8Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 20 MHz with 8-TSSOP surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain core functional compatibility while offering active product status and enhanced availability.

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-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AT25080B-TH-B is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Memory Size: 8Kbit (fixed requirement)
Memory Organization: 1K x 8 (fixed requirement)
Memory Interface: SPI (fixed requirement)
Package Type: 8-TSSOP (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)

Variable Parameters Affecting Substitution:

Clock Frequency: 20 MHz (main part) vs. 10 MHz (substitute parts) — lower frequency substitutes are functionally compatible in applications not requiring maximum speed
Voltage Supply Range: 1.8V ~ 5.5V (main part) vs. 2.5V ~ 5.5V (some substitutes) — voltage range differences require circuit validation
Operating Temperature: -40°C ~ 85°C (main part) vs. -40°C ~ 125°C (extended range substitutes) — extended temperature range substitutes provide broader operational capability

All substitute parts listed maintain identical memory capacity, organization, interface protocol, and physical packaging, ensuring direct functional replacement in SPI-based EEPROM applications.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temperature	Package	Product Status	Packaging Type
AT25080B-TH-B	Microchip Technology	8Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete	—
25AA080A-I/ST	Microchip Technology	8Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	Tube
25AA080BT-I/ST	Microchip Technology	8Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	Tape & Reel
25AA080C-I/ST	Microchip Technology	8Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	Tube
25AA080D-I/ST	Microchip Technology	8Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	Tube
25LC080B-E/ST	Microchip Technology	8Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active	Tube
25LC080BT-E/ST	Microchip Technology	8Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active	Tape & Reel
25LC080C-I/ST	Microchip Technology	8Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	Tube
25LC080CT-I/ST	Microchip Technology	8Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	Tape & Reel
25LC080D-E/ST	Microchip Technology	8Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active	Tube
25LC080DT-E/ST	Microchip Technology	8Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active	Tape & Reel

Engineering Selection Recommendations

Primary Substitutes (Recommended): The 25AA080 series (25AA080A-I/ST, 25AA080BT-I/ST, 25AA080C-I/ST, 25AA080D-I/ST) provides direct functional replacement with active product status. These parts maintain identical voltage supply range (1.8V ~ 5.5V) and operating temperature range (-40°C ~ 85°C) as the AT25080B-TH-B. The 10 MHz clock frequency is suitable for applications not requiring the 20 MHz maximum speed of the original part. Packaging options include both Tube and Tape & Reel formats for production flexibility.

Extended Temperature Range Substitutes: The 25LC080 series (25LC080B-E/ST, 25LC080BT-E/ST, 25LC080C-I/ST, 25LC080CT-I/ST, 25LC080D-E/ST, 25LC080DT-E/ST) offers extended operating temperature range to -40°C ~ 125°C, providing enhanced thermal capability for demanding environments. These parts operate at reduced voltage minimum (2.5V vs. 1.8V), requiring circuit validation for low-voltage applications. Active product status and multiple packaging options ensure long-term availability.

Packaging Considerations: Tube packaging (standard) suits lower-volume production and manual assembly. Tape & Reel packaging (TR designation) is optimized for automated pick-and-place assembly and high-volume manufacturing.

All substitute parts maintain ROHS3 compliance and identical MSL rating (1 — Unlimited), ensuring environmental and moisture sensitivity compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can 25AA080 series parts operate at the same clock frequency as AT25080B-TH-B? A: No. The 25AA080 series operates at 10 MHz maximum, while AT25080B-TH-B operates at 20 MHz. In applications where SPI clock speed is limited to 10 MHz or lower, 25AA080 parts are fully compatible. Applications requiring 20 MHz operation must use parts with matching frequency specifications.

Q: What is the voltage supply difference between 25AA080 and 25LC080 series? A: The 25AA080 series supports 1.8V ~ 5.5V supply range, matching the original AT25080B-TH-B. The 25LC080 series supports 2.5V ~ 5.5V range, with a higher minimum voltage. Designs operating below 2.5V must use 25AA080 series parts.

Q: Are 25LC080 parts suitable for high-temperature applications? A: Yes. The 25LC080 series supports extended operating temperature range to -40°C ~ 125°C, compared to -40°C ~ 85°C for 25AA080 series and the original AT25080B-TH-B. This extended range is beneficial for automotive, industrial, and harsh environment applications.

Q: What packaging format should be selected for production? A: Tube packaging is standard for lower-volume and manual assembly processes. Tape & Reel (TR) packaging is required for automated assembly lines and high-volume manufacturing. Both formats are available across the substitute part range.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and identical Moisture Sensitivity Level (MSL 1 — Unlimited), ensuring environmental and handling compatibility with the original design specifications.

Q: Can substitute parts be used interchangeably in existing designs? A: Functional interchangeability is confirmed for memory capacity, organization, interface protocol, and physical packaging. Clock frequency and voltage supply range differences require circuit validation. Extended temperature range parts provide enhanced capability without design modification.

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