AT25DF041A-MH-T Equivalent & Substitute Parts

Part Overview

The AT25DF041A-MH-T is a 4Mbit SPI FLASH memory IC manufactured by Renesas Electronics Corporation in an 8-UDFN (5x6) surface mount package. This part operates at 70 MHz with a supply voltage range of 2.7V to 3.6V and is rated for -40°C to 85°C operating temperature. The AT25DF041A-MH-T has reached obsolete product status. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and legacy system support.

Key Parameters

Parameter	Value
Memory Size	4Mbit
Memory Organization	512K x 8
Memory Interface	SPI
Clock Frequency	70 MHz
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-UDFN Exposed Pad (5x6)
Mounting Type	Surface Mount
Write Cycle Time (Word / Page)	7µs / 5ms
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the AT25DF041A-MH-T is determined by the following critical parameters:

Memory capacity (4Mbit) and organization (512K x 8)
SPI interface protocol
Package type (8-UDFN Exposed Pad, 5x6 footprint)
Operating temperature range (-40°C ~ 85°C minimum)
Supply voltage compatibility (1.65V ~ 3.6V or 2.7V ~ 3.6V)

All substitute parts maintain identical memory capacity, organization, interface, and package specifications. Substitute parts operate at equal or higher clock frequencies (85 MHz or 104 MHz) and feature improved write cycle times. The AT25DF041B-MHN-Y and AT25XE041B variants are active products with enhanced electrical specifications and RoHS3 compliance, making them suitable replacements for the obsolete AT25DF041A-MH-T.

Parameter Comparison

Parameter	AT25DF041A-MH-T (Main)	AT25DF041B-MHN-Y	AT25XE041B-MHN-T	AT25XE041B-MHN-Y	AT25XE041B-MHNHR-T
Product Status	Obsolete	Active	Active	Active	Active
Memory Size	4Mbit	4Mbit	4Mbit	4Mbit	4Mbit
Memory Organization	512K x 8	512K x 8	512K x 8	512K x 8	512K x 8
Memory Interface	SPI	SPI	SPI	SPI	SPI
Clock Frequency	70 MHz	104 MHz	85 MHz	85 MHz	85 MHz
Write Cycle Time (Word / Page)	7µs / 5ms	8µs / 2.5ms	8µs / 2.75ms	8µs / 2.75ms	8µs / 2.75ms
Voltage Supply Range	2.7V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V	1.65V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Package / Case	8-UDFN Exposed Pad	8-UDFN Exposed Pad	8-UDFN Exposed Pad	8-UDFN Exposed Pad	8-UDFN Exposed Pad
Packaging Type	Bulk	Tray	Tape & Reel	Tray	Tape & Reel
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Inventory (Pcs)	1447	955	986	4903	6100

Engineering Selection Recommendations

The AT25DF041A-MH-T is obsolete and no longer in active production. All four substitute parts are active products manufactured by Renesas Electronics Corporation and maintain full electrical and mechanical compatibility with the original design.

For new designs and production transitions, the AT25XE041B series is preferred due to superior moisture sensitivity level (MSL 1 vs. MSL 3), extended operating temperature range to 125°C on the AT25XE041B-MHNHR-T variant, and full RoHS3 compliance. The AT25XE041B-MHNHR-T offers the widest temperature specification (-40°C ~ 125°C) and unlimited moisture sensitivity, making it suitable for demanding environmental applications.

For cost-optimized selections with standard temperature requirements, the AT25DF041B-MHN-Y provides the highest clock frequency (104 MHz) and fastest page write cycle time (2.5ms) while maintaining RoHS3 compliance and active product status.

Packaging selection depends on production volume: Tape & Reel (TR) packaging is standard for high-volume automated assembly, while Tray packaging is suitable for lower-volume or manual assembly operations.

Frequently Asked Questions (FAQ)

Q: Can the AT25DF041A-MH-T be directly replaced with any of the substitute parts?

A: Yes. All substitute parts maintain identical memory capacity (4Mbit), organization (512K x 8), SPI interface, and 8-UDFN package footprint. Pin-to-pin compatibility is guaranteed for direct PCB substitution.

Q: What are the key differences between AT25DF041B-MHN-Y and AT25XE041B variants?

A: The AT25DF041B-MHN-Y operates at 104 MHz with a 2.5ms page write cycle and MSL 3 moisture sensitivity. The AT25XE041B series operates at 85 MHz with 2.75ms page write cycles and MSL 1 moisture sensitivity. The AT25XE041B-MHNHR-T extends the operating temperature range to 125°C.

Q: Does the higher clock frequency of AT25DF041B-MHN-Y (104 MHz vs. 70 MHz) require design changes?

A: No. Higher clock frequency is backward compatible. Designs using the original 70 MHz part operate without modification at the substitute part's higher frequency. Timing margins improve with the faster device.

Q: What is the difference between Tape & Reel and Tray packaging?

A: Tape & Reel (TR) packaging is used for automated pick-and-place assembly in high-volume production. Tray packaging is used for manual handling or lower-volume assembly. Both contain identical components; packaging selection depends on assembly process requirements.

Q: Why do AT25XE041B parts have MSL 1 while AT25DF041B-MHN-Y has MSL 3?

A: MSL 1 (Unlimited) indicates superior moisture resistance and longer shelf life without baking. MSL 3 (168 Hours) requires moisture baking before reflow soldering if the part has been exposed to humidity for extended periods. AT25XE041B parts offer improved handling and storage flexibility.

Q: Is the extended temperature range (-40°C ~ 125°C) of AT25XE041B-MHNHR-T necessary for standard applications?

A: The extended range is not required for standard -40°C ~ 85°C applications. It is specified for high-temperature environments such as automotive under-hood or industrial equipment. Standard applications use the -40°C ~ 85°C rated parts.

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