FT25C08A-USR-T Equivalent & Substitute Parts

Part Overview

The FT25C08A-USR-T is an 8Kbit EEPROM memory IC manufactured by Fremont Micro Devices Ltd, featuring SPI interface with 20 MHz clock frequency and 8-SOP surface mount packaging. This device operates across a wide supply voltage range of 1.8V to 5.5V and maintains functionality from -40°C to 85°C. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching core electrical and mechanical parameters: 8Kbit memory capacity, 1K x 8 organization, SPI interface, 8-SOIC/8-SOP package form factor, compatible supply voltage ranges, and identical operating temperature specifications. Substitutes may vary in clock frequency and write cycle timing within acceptable operational boundaries.

Key Parameters

Parameter	Value
Memory Size	8Kbit
Memory Organization	1K x 8
Memory Interface	SPI
Clock Frequency	20 MHz
Write Cycle Time	5ms
Supply Voltage Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Primary Matching Criteria (Non-Negotiable):

Memory capacity: 8Kbit
Memory organization: 1K x 8
Interface protocol: SPI
Package type: 8-SOIC or 8-SOP
Supply voltage compatibility: minimum 1.8V support
Operating temperature range: minimum -40°C to 85°C coverage

Secondary Variation Parameters (Allowable Differences):

Clock frequency: 1 MHz to 20 MHz (lower frequencies remain compatible with 20 MHz designs)
Write cycle time: 4ms to 5ms (timing variations acceptable within SPI protocol constraints)
Packaging format: Tube, Tape & Reel, or Cut Tape variants of the same package type

Parts are grouped into three categories based on clock frequency capability: 1-2 MHz devices (25AA080-I/SN, 25LC080-I/SN), 10 MHz devices (25AA080A-I/SN, 25AA080C-I/SN, 25AA080D-I/SN, 25LC080B-I/SN), and 20 MHz devices (AT25080B-SSHL-T, M95080-DRMN3TP/K, CAT25080VI-GT3).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Write Cycle Time	Supply Voltage	Operating Temp	Package	Packaging Format	Product Status
FT25C08A-USR-T	Fremont Micro Devices Ltd	8Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOP	Tape & Reel	Active
25AA080-I/SN	Microchip Technology	8Kbit	1 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Tube	Active
25AA080A-I/SN	Microchip Technology	8Kbit	10 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Tube	Active
25AA080AT-I/SN	Microchip Technology	8Kbit	10 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Tape & Reel	Active
25AA080C-I/SN	Microchip Technology	8Kbit	10 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Tube	Active
25AA080D-I/SN	Microchip Technology	8Kbit	10 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Tube	Active
25LC080-I/SN	Microchip Technology	8Kbit	2 MHz	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Tube	Active
25LC080B-I/SN	Microchip Technology	8Kbit	10 MHz	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Tube	Active
AT25080B-SSHL-T	Microchip Technology	8Kbit	20 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Cut Tape & Digi-Reel	Active
CAT25080VI-GT3	onsemi	8Kbit	Not Specified	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Cut Tape & Digi-Reel	Active
M95080-DRMN3TP/K	STMicroelectronics	8Kbit	20 MHz	4ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Cut Tape & Digi-Reel	Active

Engineering Selection Recommendations

Direct Equivalents (20 MHz, Full Compatibility): AT25080B-SSHL-T and M95080-DRMN3TP/K are direct functional equivalents to FT25C08A-USR-T. Both maintain 20 MHz clock frequency, 8Kbit capacity, and 1.8V to 5.5V supply voltage compatibility. AT25080B-SSHL-T is verified as DiGi-Electronics programmable. M95080-DRMN3TP/K extends operating temperature to 125°C and carries AEC-Q100 automotive qualification, with marginally faster 4ms write cycle time.

High-Speed Alternatives (10 MHz): 25AA080A-I/SN, 25AA080AT-I/SN, 25AA080C-I/SN, and 25AA080D-I/SN operate at 10 MHz, suitable for applications where full 20 MHz bandwidth is not required. 25AA080AT-I/SN is supplied in Tape & Reel format matching the original part's packaging preference and is verified as DiGi-Electronics programmable.

Lower-Speed Options (1-2 MHz): 25AA080-I/SN and 25LC080-I/SN are suitable for low-speed SPI applications. 25LC080-I/SN operates at reduced supply voltage minimum of 2.5V, limiting compatibility with 1.8V systems.

Voltage Constraint Consideration: 25LC080-I/SN and 25LC080B-I/SN specify minimum supply voltage of 2.5V, incompatible with 1.8V operation required by FT25C08A-USR-T. These parts are not suitable for designs requiring full 1.8V to 5.5V range.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity rating, and active production status.

Frequently Asked Questions (FAQ)

Q: Can 25AA080-I/SN (1 MHz) replace FT25C08A-USR-T (20 MHz)? A: Yes, from a functional standpoint. The 25AA080-I/SN operates at lower clock frequency but maintains identical memory capacity, organization, SPI interface, and voltage/temperature specifications. Applications designed for 20 MHz operation will function correctly at 1 MHz with proportionally longer data transfer times. No circuit modification is required.

Q: What is the difference between Tape & Reel and Cut Tape packaging? A: Both are surface mount formats suitable for automated assembly. Tape & Reel (TR) is supplied on continuous carrier tape for high-volume production. Cut Tape (CT) and Digi-Reel are pre-cut segments. Electrical and mechanical specifications are identical; selection depends on assembly equipment compatibility and order quantity requirements.

Q: Is M95080-DRMN3TP/K compatible with designs specified for -40°C to 85°C operation? A: Yes. M95080-DRMN3TP/K operates across -40°C to 125°C, exceeding the specified range. The extended temperature capability does not affect compatibility with designs operating within -40°C to 85°C. The part includes AEC-Q100 automotive qualification, providing additional reliability assurance.

Q: Why does 25LC080-I/SN show 2.5V minimum supply voltage? A: 25LC080-I/SN is a lower-power variant with reduced voltage range. It cannot operate at 1.8V and is incompatible with FT25C08A-USR-T applications requiring 1.8V minimum supply. Verify system voltage requirements before selection.

Q: Can I use AT25080B-SSHL-T as a direct drop-in replacement? A: Yes. AT25080B-SSHL-T matches all critical parameters: 8Kbit capacity, 20 MHz clock frequency, 1.8V to 5.5V supply range, -40°C to 85°C operation, and 8-SOIC package. Pinout and electrical characteristics are compatible. Packaging format differs (Cut Tape vs. Tape & Reel), but this does not affect circuit-level compatibility.

Q: What does "DiGi-Electronics Programmable" verification mean? A: This indicates the part has been tested and verified by DiGi-Electronics for programming compatibility and functionality. Verified status provides additional confidence in part performance. Non-verified parts remain functionally equivalent but lack this third-party validation.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the environmental and regulatory status of FT25C08A-USR-T.

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