Equivalent & Substitute Parts for 602-20012 EEPROM Memory IC 128Kbit I2C

Part Overview

The Parallax Inc. 602-20012 is a 128Kbit EEPROM memory integrated circuit utilizing I2C serial interface technology. This non-volatile memory device operates at 1 MHz clock frequency with 400 ns access time, housed in an 8-SOIC surface mount package. The part is currently in active production status with 1071 units in stock inventory. Substitute parts are identified to address supply chain continuity, alternative sourcing requirements, or specific application constraints while maintaining electrical and mechanical compatibility within defined parameter ranges.

Key Parameters

Parameter	Value	Unit
Memory Size	128Kbit	—
Memory Organization	16K x 8	—
Memory Interface	I2C	—
Clock Frequency	1 MHz	MHz
Access Time	400 ns	ns
Write Cycle Time	5 ms	ms
Supply Voltage Range	1.7V ~ 5.5V	V
Operating Temperature	-40°C ~ 85°C	°C
Package Type	8-SOIC	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the 602-20012 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Memory Size: 128Kbit (exact match required)
Memory Organization: 16K x 8 (exact match required)
Memory Interface: I2C (exact match required)
Memory Format: EEPROM (exact match required)
Package Type: 8-SOIC (exact match required)
Mounting Type: Surface Mount (exact match required)
Supply Voltage Range: Must encompass or equal 1.7V ~ 5.5V
Operating Temperature: Must encompass or equal -40°C ~ 85°C

Allowable Parameter Variations:

Clock Frequency: 400 kHz or 1 MHz (both acceptable for I2C EEPROM applications)
Access Time: 400 ns, 550 ns, or 900 ns (slower access times remain compatible)
Write Cycle Time: 5 ms (fixed across all candidates)
Moisture Sensitivity Level: 1 or 3 (both acceptable)
RoHS Status: RoHS3 Compliant or RoHS Compliant (both acceptable)

Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching 1 MHz clock frequency and 400 ns access time) and Functional Equivalents (operating at reduced clock frequency with acceptable performance degradation).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Supply Voltage	Operating Temp	Package	RoHS Status	Inventory
602-20012	Parallax Inc.	128Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	RoHS Compliant	1071
24AA128-I/SN	Microchip Technology	128Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant	12600
AT24C128C-SSHM-B	Microchip Technology	128Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant	2352
BR24G128FJ-3AGTE2	Rohm Semiconductor	128Kbit	1 MHz	Not Specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant	2100
BR24G128FJ-3GTE2	Rohm Semiconductor	128Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant	55300
BR24T128FJ-WE2	Rohm Semiconductor	128Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant	1120
24FC128-I/SN	Microchip Technology	128Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	ROHS3 Compliant	1452

Engineering Selection Recommendations

Direct Electrical Equivalents (Preferred for Pin-Compatible Replacement):

The 24FC128-I/SN (Microchip Technology) provides the closest electrical match to the 602-20012, with identical 1 MHz clock frequency, 400 ns access time, and 1.7V ~ 5.5V supply voltage range. This part is ROHS3 Compliant and maintains full functional compatibility. The AT24C128C-SSHM-B (Microchip Technology) operates at 1 MHz with slightly degraded access time (550 ns) but remains within acceptable performance parameters for most I2C EEPROM applications.

Functional Equivalents (Reduced Clock Frequency):

The 24AA128-I/SN, BR24G128FJ-3GTE2, and BR24T128FJ-WE2 operate at 400 kHz clock frequency, representing a 60% reduction from the primary specification. These parts are suitable for applications where reduced I2C bus speed is acceptable. The BR24G128FJ-3GTE2 offers the highest inventory availability (55300 units) among all candidates.

Supply Voltage Consideration:

The BR24G128FJ-3GTE2 and BR24T128FJ-WE2 specify a minimum supply voltage of 1.6V, compared to 1.7V for the primary part. This represents a 0.1V reduction in minimum operating voltage and is acceptable for most applications operating within standard voltage ranges.

Compliance Status:

All substitute parts carry ROHS3 Compliant or RoHS Compliant certification, meeting regulatory requirements equivalent to or exceeding the primary part specification.

Frequently Asked Questions (FAQ)

Q: Can the 24AA128-I/SN replace the 602-20012 in all applications?

A: The 24AA128-I/SN is electrically compatible but operates at 400 kHz clock frequency versus the 602-20012's 1 MHz specification. Substitution is valid for applications where reduced I2C bus speed does not impact system performance. Access time increases from 400 ns to 900 ns. Verify timing-critical operations before deployment.

Q: What is the difference between the BR24G128FJ-3AGTE2 and BR24G128FJ-3GTE2?

A: Both parts are manufactured by Rohm Semiconductor with identical 128Kbit capacity and 8-SOIC packaging. The BR24G128FJ-3AGTE2 operates at 1 MHz clock frequency, while the BR24G128FJ-3GTE2 operates at 400 kHz. The BR24G128FJ-3GTE2 offers significantly higher inventory availability (55300 units versus 2100 units).

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts carry either RoHS Compliant or ROHS3 Compliant certification, meeting environmental and regulatory requirements.

Q: Does package type vary among substitute parts?

A: All substitute parts utilize 8-SOIC surface mount packaging with 0.154" (3.90mm) width, ensuring mechanical compatibility with the 602-20012 footprint. Packaging format (Tube versus Tape & Reel) differs but does not affect electrical or mechanical compatibility.

Q: What is the impact of 550 ns access time in the AT24C128C-SSHM-B compared to 400 ns?

A: The 150 ns increase in access time represents a 37.5% degradation in read speed. For most I2C EEPROM applications, this remains within acceptable performance margins. Verify timing requirements in data acquisition or real-time applications before substitution.

Q: Can I use the BR24T128FJ-WE2 in place of the 602-20012?

A: The BR24T128FJ-WE2 is functionally compatible with identical memory capacity, organization, and interface. However, it operates at 400 kHz (versus 1 MHz) and specifies 1.6V minimum supply voltage (versus 1.7V). Substitution is valid for applications tolerating reduced I2C bus speed and operating within the 1.6V ~ 5.5V supply range.

Q: Which substitute part offers the best inventory availability?

A: The BR24G128FJ-3GTE2 (Rohm Semiconductor) provides the highest inventory level at 55300 units. This part operates at 400 kHz clock frequency and is suitable for applications where reduced I2C bus speed is acceptable.

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