CAT34C02HU4I-GT4 Equivalent & Substitute Parts

Part Overview

The CAT34C02HU4I-GT4 is a 2Kbit EEPROM memory IC manufactured by onsemi, featuring I2C interface with 400 kHz clock frequency and 8-UDFN-EP (2x3) surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates across a wide supply voltage range of 1.7V to 5.5V and supports industrial temperature ranges from -40°C to 85°C.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	2Kbit
Memory Organization	256 x 8
Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5 ms
Supply Voltage Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package	8-UDFN Exposed Pad (2x3)

Substitute Part Grouping Explanation

Substitute parts for the CAT34C02HU4I-GT4 are classified based on the following substitution criteria:

Direct Manufacturer Equivalents maintain identical electrical specifications and base product number (CAT34C02), with variations only in packaging format or product status. These parts share the same memory capacity, interface protocol, timing characteristics, and voltage specifications.

Parametric Equivalents provide identical functional performance across all critical electrical parameters including memory size, interface type, clock frequency, access time, and voltage range, but may differ in package designation or supplier device package format.

Similar Manufacturer Parts from alternative suppliers (Rohm Semiconductor, Microchip Technology) meet the core functional requirements of 2Kbit I2C EEPROM operation at 400 kHz with compatible voltage and temperature ranges. Package variations exist across different manufacturers' implementations.

Critical substitution parameters:

Memory capacity: 2Kbit (256 x 8 organization)
Interface protocol: I2C at 400 kHz
Supply voltage compatibility: minimum 1.7V support required
Operating temperature range: -40°C to 85°C minimum
Access time: 900 ns
Write cycle time: 5 ms

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Freq	Supply Voltage	Temp Range	Package	Status	RoHS
CAT34C02HU4I-GT4	onsemi	2Kbit	I2C	400 kHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-UDFN-EP (2x3)	Obsolete	Unaffected
CAT34C02HU4IGT4A	onsemi	2Kbit	I2C	400 kHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-UDFN-EP (2x3)	Active	ROHS3 Compliant
CAT34C02HU4IGT4U5	onsemi	2Kbit	I2C	400 kHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-UDFN (2x3)	Active	ROHS3 Compliant
CHS34C02HU4I-GT4	onsemi	2Kbit	I2C	400 kHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-UDFN-EP (2x3)	Active	ROHS3 Compliant
BR24L02NUX-WTR	Rohm Semiconductor	2Kbit	I2C	400 kHz	1.8V ~ 5.5V	-40°C ~ 85°C	VSON008X2030	Active	ROHS3 Compliant
24AA024T-I/MC	Microchip Technology	2Kbit	I2C	400 kHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-DFN (2x3)	Active	ROHS3 Compliant
24AA024T-I/MNY	Microchip Technology	2Kbit	I2C	400 kHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active	ROHS3 Compliant
24AA02T-I/MNY	Microchip Technology	2Kbit	I2C	400 kHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active	ROHS3 Compliant
24LC024T-I/MNY	Microchip Technology	2Kbit	I2C	400 kHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active	ROHS3 Compliant
24LC02BT-E/MNY	Microchip Technology	2Kbit	I2C	400 kHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-TDFN (2x3)	Active	ROHS3 Compliant
24LC02BT-I/MC	Microchip Technology	2Kbit	I2C	400 kHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-DFN (2x3)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: CAT34C02HU4IGT4A

This onsemi part is the direct active equivalent to the obsolete CAT34C02HU4I-GT4. It maintains identical electrical specifications, package format, and pinout. The part is ROHS3 compliant and carries active product status with substantial inventory availability (5343 pcs). This selection eliminates any design re-qualification requirements.

Alternative from onsemi: CAT34C02HU4IGT4U5

This variant provides identical electrical performance with active status and ROHS3 compliance. The package designation differs (8-UDFN versus 8-UDFN-EP), which may require PCB layout verification for thermal pad compatibility. Inventory availability is adequate (5120 pcs).

Cross-Manufacturer Alternatives

Microchip Technology 24-series parts (24AA02T-I/MNY, 24AA024T-I/MC, 24LC02BT-I/MC) provide parametric equivalence with active status and ROHS3 compliance. These require package-specific PCB layout adjustments. The 24LC02BT-E/MNY variant extends operating temperature to 125°C but restricts minimum supply voltage to 2.5V.

Rohm Semiconductor BR24L02NUX-WTR offers parametric equivalence with verified DiGi-Electronics programmability status and the highest inventory availability (184920 pcs). The VSON008X2030 package requires PCB layout modification from the original 8-UDFN format.

Voltage Compatibility Consideration

Parts with 2.5V minimum supply voltage (24LC024T-I/MNY, 24LC02BT-E/MNY, 24LC02BT-I/MC) are not suitable for applications requiring operation below 2.5V. The original CAT34C02HU4I-GT4 and its direct equivalents support 1.7V minimum.

Frequently Asked Questions (FAQ)

Q: Can I directly replace CAT34C02HU4I-GT4 with CAT34C02HU4IGT4A without PCB modifications?

A: Yes. CAT34C02HU4IGT4A is the direct active equivalent with identical pinout, package format (8-UDFN-EP 2x3), and electrical specifications. No design changes are required.

Q: What is the difference between CAT34C02HU4IGT4A and CAT34C02HU4IGT4U5?

A: Both parts are electrically identical with identical pinout and performance. The difference is in the package designation: CAT34C02HU4IGT4A uses 8-UDFN-EP (exposed pad), while CAT34C02HU4IGT4U5 uses 8-UDFN (standard). Verify thermal pad requirements for your application before substitution.

Q: Can I use Microchip 24AA02T-I/MNY as a substitute?

A: Yes, for parametric equivalence. However, the package is 8-TDFN (2x3) instead of 8-UDFN-EP, requiring PCB layout modification. Electrical specifications including memory capacity, I2C interface, 400 kHz operation, and voltage range (1.7V ~ 5.5V) are compatible.

Q: Why do some parts have 2.5V minimum supply voltage instead of 1.7V?

A: Microchip's 24LC-series parts (24LC024T-I/MNY, 24LC02BT-E/MNY, 24LC02BT-I/MC) are specified with 2.5V minimum supply voltage. These are not suitable for low-voltage applications requiring operation below 2.5V. Use 24AA-series parts for 1.7V minimum compatibility.

Q: Is the Rohm BR24L02NUX-WTR a suitable replacement?

A: Yes, for parametric equivalence with verified programmability status. The VSON008X2030 package differs from the original 8-UDFN-EP format, requiring PCB layout redesign. Supply voltage minimum is 1.8V (versus 1.7V original). Inventory availability is significantly higher.

Q: What does "ROHS3 Compliant" mean for substitution?

A: ROHS3 Compliant indicates the part meets Restriction of Hazardous Substances Directive requirements. All active substitute parts listed carry this certification, ensuring regulatory compliance for new designs and production.

Q: Can I use 24LC02BT-E/MNY for applications requiring -40°C to 125°C operation?

A: Yes. The 24LC02BT-E/MNY extends the upper operating temperature to 125°C. However, verify that your application's minimum supply voltage requirement is 2.5V or higher, as this part does not support the original 1.7V minimum.

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