AT24C04BY6-YH-T Equivalent & Substitute Parts

Part Overview

The AT24C04BY6-YH-T is a 4Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This part operates at 1 MHz clock frequency with 550 ns access time and supports a supply voltage range of 1.8V to 5.5V. The device is packaged in an 8-Mini Map (2x3) form factor and is currently classified as obsolete. Due to its obsolete status, equivalent substitute parts with active product status are necessary to maintain design continuity and ensure long-term component availability for new production runs and system updates.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UFDFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT24C04BY6-YH-T is determined by the following critical parameters:

Memory capacity: 4Kbit (512 x 8 organization)
Interface protocol: I2C
Supply voltage compatibility: Minimum 1.8V support required
Operating temperature range: -40°C to 85°C
Package form factor: 8-pin UFDFN with exposed pad
Write cycle time: 5ms
RoHS3 compliance

Substitute parts are grouped into two functional categories based on clock frequency performance:

Category 1 (1 MHz Operation): Parts maintaining the original 1 MHz clock frequency with 550 ns access time, providing direct functional equivalence.

Category 2 (400 kHz Operation): Parts operating at reduced clock frequency (400 kHz) with 900 ns access time, suitable for applications where lower speed operation is acceptable.

All substitute parts maintain I2C protocol compatibility, identical memory capacity, matching temperature range, and equivalent package dimensions.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package	Product Status
AT24C04BY6-YH-T	Microchip Technology	4Kbit (512x8)	1 MHz	550 ns	1.8V ~ 5.5V	8-UFDFN	Obsolete
AT24CS04-MAHM-T	Microchip Technology	4Kbit (512x8)	1 MHz	550 ns	1.7V ~ 5.5V	8-UFDFN	Active
AT24CS04-MAHM-E	Microchip Technology	4Kbit (512x8)	1 MHz	550 ns	1.7V ~ 5.5V	8-UFDFN	Active
24AA04T-I/MNY	Microchip Technology	4Kbit (256x8x2)	400 kHz	900 ns	1.7V ~ 5.5V	8-WFDFN	Active
BR24G04NUX-3ATTR	Rohm Semiconductor	4Kbit (512x8)	1 MHz	Not specified	1.6V ~ 5.5V	8-UFDFN	Active
BR24G04NUX-3TTR	Rohm Semiconductor	4Kbit (512x8)	400 kHz	Not specified	1.6V ~ 5.5V	8-UFDFN	Active
BR24L04NUX-WTR	Rohm Semiconductor	4Kbit (512x8)	400 kHz	Not specified	1.8V ~ 5.5V	8-UFDFN	Active
BR24T04NUX-WTR	Rohm Semiconductor	4Kbit (512x8)	400 kHz	Not specified	1.6V ~ 5.5V	8-UFDFN	Active
CAT24C04HU4I-GT3	onsemi	4Kbit (512x8)	400 kHz	900 ns	1.7V ~ 5.5V	8-UFDFN	Active
M24C04-FMC5TG	STMicroelectronics	4Kbit (512x8)	400 kHz	900 ns	1.7V ~ 5.5V	8-UFDFN	Active
M24C04-FMC6TG	STMicroelectronics	4Kbit (512x8)	400 kHz	900 ns	1.7V ~ 5.5V	8-UFDFN	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalence):

AT24CS04-MAHM-T and AT24CS04-MAHM-E are the preferred substitutes, both manufactured by Microchip Technology with identical 1 MHz clock frequency and 550 ns access time. Both parts maintain active product status and ROHS3 compliance. AT24CS04-MAHM-T offers higher inventory availability (6161 units) compared to AT24CS04-MAHM-E (998 units). The voltage supply range of 1.7V to 5.5V is compatible with the original 1.8V to 5.5V specification.

BR24G04NUX-3ATTR from Rohm Semiconductor provides 1 MHz operation with active status and ROHS3 compliance, supporting voltage range 1.6V to 5.5V. This part is suitable for applications requiring extended low-voltage operation below 1.7V.

Secondary Substitutes (Reduced Clock Frequency):

For applications where 400 kHz I2C operation is acceptable, multiple active alternatives exist: BR24G04NUX-3TTR, BR24L04NUX-WTR, BR24T04NUX-WTR (Rohm Semiconductor), CAT24C04HU4I-GT3 (onsemi), and M24C04-FMC5TG, M24C04-FMC6TG (STMicroelectronics). All maintain 4Kbit capacity, 512 x 8 organization, 5ms write cycle time, and ROHS3 compliance. CAT24C04HU4I-GT3 offers the highest inventory availability (18,676 units).

24AA04T-I/MNY from Microchip Technology operates at 400 kHz with different memory organization (256 x 8 x 2) and package variant (8-WFDFN), suitable only for applications where package flexibility is required.

All recommended substitutes maintain -40°C to 85°C operating temperature range and surface mount capability.

Frequently Asked Questions (FAQ)

Q: Can AT24CS04-MAHM-T directly replace AT24C04BY6-YH-T?

A: Yes. Both parts share identical memory capacity (4Kbit, 512 x 8), I2C interface, 1 MHz clock frequency, 550 ns access time, 5ms write cycle time, and 8-UFDFN package. The voltage supply range of 1.7V to 5.5V is compatible with the original 1.8V to 5.5V specification. AT24CS04-MAHM-T is active status with 6161 units in stock.

Q: What is the difference between 1 MHz and 400 kHz substitute parts?

A: Clock frequency determines I2C bus speed. 1 MHz parts (AT24CS04-MAHM-T, BR24G04NUX-3ATTR) maintain the original speed with 550 ns access time. 400 kHz parts (BR24G04NUX-3TTR, CAT24C04HU4I-GT3, M24C04-FMC6TG) operate at reduced speed with 900 ns access time. Selection depends on system I2C bus configuration and timing requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original AT24C04BY6-YH-T specification.

Q: Does package variant affect substitution?

A: All substitute parts use 8-UFDFN Exposed Pad package except 24AA04T-I/MNY, which uses 8-WFDFN. The 8-UFDFN variants are pin-compatible and footprint-compatible with the original. The 24AA04T-I/MNY requires PCB layout modification.

Q: What is the minimum voltage requirement for substitutes?

A: Most substitutes support 1.7V minimum (AT24CS04-MAHM-T, 24AA04T-I/MNY, CAT24C04HU4I-GT3, M24C04 series). Rohm parts support 1.6V minimum (BR24G04NUX-3ATTR, BR24G04NUX-3TTR, BR24T04NUX-WTR), and BR24L04NUX-WTR supports 1.8V minimum. Select based on system power supply specifications.

Q: Which substitute offers the best inventory availability?

A: CAT24C04HU4I-GT3 from onsemi provides the highest inventory (18,676 units) among 400 kHz alternatives. For 1 MHz operation, AT24CS04-MAHM-T offers 6161 units.

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