AT24HC02BN-SH-T Equivalent & Substitute Parts

Part Overview

The AT24HC02BN-SH-T is a 2Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This device operates at 1 MHz clock frequency with 550 ns access time, housed in an 8-SOIC surface mount package. The part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and production continuity. Substitute parts must maintain compatibility across memory capacity, interface protocol, package form factor, and operating voltage range while accounting for differences in clock frequency and access time specifications.

Key Parameters

Parameter	AT24HC02BN-SH-T
Memory Size	2Kbit
Memory Organization	256 x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Voltage Supply 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 strict adherence to the following parameters:

Critical Parameters (Must Match):

Memory Size: 2Kbit
Memory Organization: 256 x 8
Memory Interface: I2C
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount

Compatible Variation Parameters:

Clock Frequency: 400 kHz (lower than original 1 MHz, acceptable for I2C protocol)
Access Time: 900 ns (slower than original 550 ns, acceptable for I2C timing)
Voltage Supply Range: 1.7V ~ 5.5V or 1.8V ~ 5.5V (overlapping ranges acceptable)
Operating Temperature: -40°C ~ 85°C or 0°C ~ 70°C (application-dependent selection)

All substitute parts listed are manufactured by Microchip Technology and maintain ROHS3 compliance. Differences in clock frequency and access time do not affect functional compatibility in I2C bus applications, as these parameters operate within I2C specification tolerances.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status	Packaging Type
AT24HC02BN-SH-T	Microchip Technology	2Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Obsolete	-
24AA024H-I/SN	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Tube
24AA52-I/SN	Microchip Technology	2Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Tube
24AA02/SN	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	Tube
24AA024HT-I/SN	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Tape & Reel
24AA024T-I/SN	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Tape & Reel
24AA025T-I/SN	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Tape & Reel
24AA02HT-I/SN	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Tape & Reel
24AA02T-I/SN	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Cut Tape & Digi-Reel
24AA02T/SN	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	Tape & Reel
24AA52T-I/SN	Microchip Technology	2Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	Tape & Reel

Engineering Selection Recommendations

All listed substitute parts are active production components manufactured by Microchip Technology and maintain ROHS3 compliance, ensuring regulatory alignment with current manufacturing standards. The AT24HC02BN-SH-T obsolescence status necessitates transition to one of these active alternatives.

For Extended Temperature Range Applications (-40°C ~ 85°C): Select from 24AA024H-I/SN, 24AA52-I/SN, 24AA024HT-I/SN, 24AA024T-I/SN, 24AA025T-I/SN, 24AA02HT-I/SN, or 24AA52T-I/SN. These parts maintain the full industrial temperature range of the original device.

For Commercial Temperature Range Applications (0°C ~ 70°C): 24AA02/SN and 24AA02T/SN are suitable alternatives with reduced temperature specification.

For Tape & Reel Packaging (High-Volume Production): 24AA024HT-I/SN, 24AA024T-I/SN, 24AA025T-I/SN, 24AA02HT-I/SN, 24AA02T-I/SN, and 24AA52T-I/SN provide automated assembly compatibility.

For Tube or Cut Tape Packaging (Lower-Volume or Prototype Applications): 24AA024H-I/SN, 24AA52-I/SN, 24AA02/SN, and 24AA02T-I/SN accommodate manual or semi-automated assembly processes.

For Voltage Supply Compatibility (1.8V Minimum): 24AA52-I/SN and 24AA52T-I/SN specify 1.8V ~ 5.5V, matching the original part's lower voltage limit. Other alternatives operate from 1.7V minimum.

Frequently Asked Questions (FAQ)

Q: Why is the AT24HC02BN-SH-T obsolete, and what are the implications?

A: The AT24HC02BN-SH-T is classified as obsolete by Microchip Technology, indicating end-of-life status and discontinuation of production. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. New designs and production continuity require transition to active substitute parts listed in this document.

Q: Are all substitute parts pin-compatible with the AT24HC02BN-SH-T?

A: Yes. All substitute parts use the 8-SOIC package with identical pinout and footprint. Direct PCB replacement is possible without layout modifications.

Q: What is the functional difference between 1 MHz and 400 kHz clock frequency?

A: The original AT24HC02BN-SH-T operates at 1 MHz, while substitute parts operate at 400 kHz. Both frequencies comply with I2C bus specifications. The 400 kHz standard is the most common I2C clock frequency in industrial applications. Lower clock frequency does not affect functional compatibility; it may reduce maximum data transfer rate in applications requiring sustained high-speed I2C communication, but this is uncommon in typical EEPROM applications.

Q: Does the 900 ns access time of substitute parts affect system performance compared to the 550 ns original specification?

A: Access time represents the delay from I2C address/command transmission to data availability. The 900 ns specification of substitute parts remains well within I2C protocol timing requirements. System performance impact is negligible in standard I2C applications operating at 400 kHz or lower clock frequencies.

Q: Which substitute part should I select for new production designs?

A: For new designs requiring extended temperature range (-40°C ~ 85°C) and tape & reel packaging, 24AA024T-I/SN is recommended. This part is actively produced, verified for programmability, and available in high-volume packaging. For applications with commercial temperature requirements (0°C ~ 70°C), 24AA02T/SN provides equivalent functionality with lower cost.

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

A: All parts maintain ROHS3 compliance and REACH unaffected status. Moisture Sensitivity Level (MSL) varies: the original part specifies MSL 1 (unlimited), while 24AA024T-I/SN specifies MSL 3 (168 hours). MSL 3 requires controlled storage and handling during assembly; consult component datasheet for specific moisture control procedures if this part is selected.

Q: Can I mix different substitute part numbers in the same production batch?

A: Yes, all substitute parts are functionally equivalent and pin-compatible. However, maintaining consistent part numbers within a production batch simplifies inventory management, traceability, and quality documentation. If multiple part numbers are used, ensure clear documentation of substitution rationale and part-specific handling requirements, particularly regarding MSL specifications.

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