AT25BCM512B-MAH-T Equivalent & Substitute Parts

Part Overview

The AT25BCM512B-MAH-T is a 512Kbit SPI FLASH memory IC manufactured by Renesas Electronics Corporation, packaged in 8-UDFN (2x3) with exposed pad. This part operates at 70 MHz clock frequency and is designed for non-volatile data storage applications requiring SPI interface connectivity. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives with compatible electrical and mechanical specifications are available from Renesas Electronics and other manufacturers.

Key Parameters

Parameter	Value
Memory Size	512Kbit
Memory Organization	64K x 8
Memory Interface	SPI
Clock Frequency	70 MHz
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C (TC)
Package / Case	8-UFDFN Exposed Pad
Mounting Type	Surface Mount
Write Cycle Time - Word	15µs
Write Cycle Time - Page	5ms
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the AT25BCM512B-MAH-T is determined by strict compatibility across the following critical parameters:

Primary Compatibility Criteria:

Memory Size: 512Kbit (fixed requirement)
Memory Organization: 64K x 8 (fixed requirement)
Memory Interface: SPI (fixed requirement)
Package / Case: 8-UFDFN Exposed Pad (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)
Operating Temperature Range: -40°C ~ 85°C (fixed requirement)
Moisture Sensitivity Level: 1 (Unlimited) or equivalent

Secondary Compatibility Criteria (allowable variation):

Clock Frequency: 70 MHz or higher (backward compatible)
Voltage Supply Range: Must encompass or be compatible with 2.7V ~ 3.6V
Write Cycle Time: May be faster (lower values acceptable)

Substitute parts are grouped into two categories:

Category 1 - Renesas AT25 Series (Direct Renesas Alternatives): AT25BCM512C-MAHF-T, AT25DF512C-MAHN-T, AT25DF512C-MAHNGU-T, AT25DN512C-MAHF-T, AT25DN512C-MAHFGP-T, AT25XE512C-MAHN-T

These parts maintain identical memory specifications, package, and mounting characteristics while offering active product status and enhanced performance parameters.

Category 2 - Cross-Manufacturer Alternative: W25X05CLUXIG TR (Winbond Electronics)

This part meets all primary compatibility criteria with identical memory size, organization, interface, and package specifications. Package designation differs slightly (8-USON vs. 8-UFDFN) but both are 8-pin surface mount packages with identical pinout compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Write Cycle - Word / Page	Product Status	Package
AT25BCM512B-MAH-T	Renesas	512Kbit	70 MHz	2.7V ~ 3.6V	15µs / 5ms	Obsolete	8-UFDFN
AT25BCM512C-MAHF-T	Renesas	512Kbit	70 MHz	2.7V ~ 3.6V	15µs / 5ms	Active	8-UFDFN
AT25DF512C-MAHN-T	Renesas	512Kbit	104 MHz	1.65V ~ 3.6V	8µs / 4.6ms	Active	8-UFDFN
AT25DF512C-MAHNGU-T	Renesas	512Kbit	104 MHz	1.65V ~ 3.6V	8µs / 4.6ms	Active	8-UFDFN
AT25DN512C-MAHF-T	Renesas	512Kbit	104 MHz	2.3V ~ 3.6V	8µs / 1.75ms	Active	8-UFDFN
AT25DN512C-MAHFGP-T	Renesas	512Kbit	104 MHz	2.3V ~ 3.6V	8µs / 1.75ms	Active	8-UFDFN
AT25XE512C-MAHN-T	Renesas	512Kbit	104 MHz	1.65V ~ 3.6V	12µs / 3ms	Active	8-UFDFN
W25X05CLUXIG TR	Winbond	512Kbit	104 MHz	2.3V ~ 3.6V	800µs	Active	8-USON

Engineering Selection Recommendations

Primary Recommendation - AT25BCM512C-MAHF-T: This Renesas part provides the closest electrical and mechanical match to the obsolete AT25BCM512B-MAH-T. It maintains identical clock frequency (70 MHz), voltage supply range (2.7V ~ 3.6V), and write cycle timing. Product status is active with ROHS3 compliance and REACH unaffected certification. This part requires no design modification and offers maximum compatibility.

Secondary Recommendations - AT25DF512C-MAHN-T, AT25DN512C-MAHF-T, AT25XE512C-MAHN-T: These Renesas alternatives offer enhanced performance with 104 MHz clock frequency and faster write cycle times. All maintain 8-UFDFN package compatibility and active product status. Voltage supply ranges vary slightly but remain compatible with standard 3.3V supply designs. These parts are suitable for designs where improved performance is beneficial or required.

Cross-Manufacturer Alternative - W25X05CLUXIG TR: The Winbond W25X05CLUXIG TR meets all primary compatibility criteria with identical memory specifications and SPI interface. Package designation is 8-USON rather than 8-UFDFN, but both are equivalent 8-pin surface mount packages with identical pinout. This part is suitable for applications where cross-manufacturer sourcing is required. Write cycle time is significantly longer (800µs) and should be evaluated for timing-critical applications.

Compliance Status: All recommended substitute parts carry ROHS3 compliance and REACH unaffected certification, meeting current regulatory requirements for electronic component manufacturing and use.

Frequently Asked Questions (FAQ)

Q: Can AT25BCM512C-MAHF-T be used as a direct replacement for AT25BCM512B-MAH-T?

A: Yes. The AT25BCM512C-MAHF-T is a direct replacement. Both parts share identical memory size (512Kbit), organization (64K x 8), SPI interface, clock frequency (70 MHz), voltage supply range (2.7V ~ 3.6V), and 8-UFDFN package. The primary difference is product status: AT25BCM512B-MAH-T is obsolete while AT25BCM512C-MAHF-T is active. No design modifications are required.

Q: What is the difference between AT25DF512C and AT25DN512C series?

A: Both series maintain 512Kbit memory size, 64K x 8 organization, and SPI interface. Key differences are: AT25DF512C operates at 1.65V ~ 3.6V supply with 104 MHz clock and 4.6ms page write time. AT25DN512C operates at 2.3V ~ 3.6V supply with 104 MHz clock and 1.75ms page write time. AT25DN512C offers faster page write performance. Both are compatible with the original AT25BCM512B-MAH-T in terms of package and mounting.

Q: Is the Winbond W25X05CLUXIG TR compatible with the AT25BCM512B-MAH-T?

A: The W25X05CLUXIG TR meets all primary compatibility criteria: 512Kbit memory, 64K x 8 organization, SPI interface, 8-pin surface mount package, and -40°C ~ 85°C operating temperature. Package designation differs (8-USON vs. 8-UFDFN) but both are equivalent 8-pin packages with identical pinout. The primary limitation is write cycle time (800µs vs. 15µs), which may impact applications requiring frequent write operations. Evaluate timing requirements before selection.

Q: What does Moisture Sensitivity Level (MSL) 1 mean?

A: MSL 1 indicates unlimited shelf life without moisture absorption concerns. The original AT25BCM512B-MAH-T and all recommended Renesas substitutes carry MSL 1. The Winbond W25X05CLUXIG TR carries MSL 3 (168 hours), requiring moisture control during storage and handling. This is a secondary consideration for most applications but should be noted for high-reliability or long-term storage scenarios.

Q: Can I use AT25XE512C-MAHN-T as a substitute?

A: Yes. The AT25XE512C-MAHN-T is compatible with identical memory specifications, SPI interface, and 8-UFDFN package. It operates at 104 MHz (higher than the original 70 MHz) with 1.65V ~ 3.6V supply range. Write cycle time is 12µs for word operations and 3ms for page operations, which is faster than the original. This part is suitable for designs where improved performance is acceptable or required.

Q: Are there any compliance or certification differences between substitute parts?

A: All Renesas substitute parts (AT25BCM512C-MAHF-T, AT25DF512C series, AT25DN512C series, AT25XE512C-MAHN-T) carry ROHS3 compliance and REACH unaffected certification. The Winbond W25X05CLUXIG TR also carries ROHS3 compliance and REACH unaffected certification. All parts meet current regulatory requirements for electronic component manufacturing and use in EU and international markets.

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