AT24C32C-TH-T EEPROM 32Kbit I2C Equivalent & Substitute Parts

Part Overview

The AT24C32C-TH-T is a 32Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 1 MHz clock frequency and 550 ns access time. This device is packaged in 8-TSSOP surface mount configuration and operates across a supply voltage range of 1.8V to 5.5V with temperature range of -40°C to 85°C.

The AT24C32C-TH-T is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	32Kbit
Memory Organization	4K 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 Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AT24C32C-TH-T is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Memory Size: 32Kbit (4K x 8 organization)
Memory Interface: I2C protocol
Package Type: 8-TSSOP form factor
Mounting Type: Surface Mount
RoHS Compliance: ROHS3 Compliant

Secondary Compatibility Parameters:

Voltage Supply Range: Minimum 1.8V support required
Operating Temperature: -40°C to 85°C minimum
Write Cycle Time: 5 ms maximum
Clock Frequency: 1 MHz or 400 kHz operation
Access Time: 550 ns or 900 ns

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

Category A - 1 MHz Clock Frequency (Direct Performance Match): Parts maintaining 1 MHz I2C clock speed with 550 ns access time, suitable for applications requiring maximum data transfer rates.

Category B - 400 kHz Clock Frequency (Reduced Speed Operation): Parts operating at 400 kHz I2C clock speed with 900 ns access time, suitable for applications with relaxed timing requirements and compatible with 1 MHz bus systems through backward compatibility.

All substitute parts maintain identical memory capacity, I2C interface protocol, 8-TSSOP packaging, and surface mount configuration.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
AT24C32C-TH-T	Microchip Technology	32Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
24AA32AF-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA32AFT-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA32AT-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA32AX-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24AA32AXT-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
AT24CS32-XHM-T	Microchip Technology	32Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G32FVT-3AGE2	Rohm Semiconductor	32Kbit	1 MHz	Not Specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24G32FVT-3GE2	Rohm Semiconductor	32Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24L32FVT-WE2	Rohm Semiconductor	32Kbit	400 kHz	Not Specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
CAT24C32YI-G	onsemi	32Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Performance Equivalent:

The AT24CS32-XHM-T (Microchip Technology) is the primary recommended substitute. This part maintains identical electrical performance characteristics to the AT24C32C-TH-T, including 1 MHz clock frequency and 550 ns access time. The AT24CS32-XHM-T is in active production status with ROHS3 compliance and MSL 3 rating. Voltage supply range extends to 1.7V minimum, providing enhanced low-voltage operation capability.

Secondary Recommendation - Cross-Manufacturer Alternative:

The BR24G32FVT-3AGE2 (Rohm Semiconductor) provides equivalent 1 MHz I2C performance in 8-TSSOP-B package configuration. This part is in active production with extensive inventory availability (50,300 pcs), ROHS3 compliance, and MSL 1 rating. Voltage supply range of 1.7V to 5.5V matches the original specification.

Alternative for Relaxed Timing Applications:

The 24AA32AT-I/ST (Microchip Technology) operates at 400 kHz clock frequency with 900 ns access time. This part is verified for DiGi-Electronics programmability and offers extended operating temperature range to 125°C. Suitable for applications where reduced I2C bus speed is acceptable and enhanced temperature performance is beneficial.

Extended Temperature Option:

The 24AA32AX-I/ST and 24AA32AXT-I/ST (Microchip Technology) provide 400 kHz operation with operating temperature range extended to -40°C to 125°C. These parts are suitable for industrial and automotive applications requiring enhanced thermal performance.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original part specification.

Frequently Asked Questions (FAQ)

Q1: Can the AT24C32C-TH-T be directly replaced with 400 kHz clock frequency parts?

A: Yes, with design verification. Parts operating at 400 kHz (24AA32AF-I/ST, 24AA32AT-I/ST, 24AA32AX-I/ST, BR24G32FVT-3GE2, BR24L32FVT-WE2) are backward compatible with 1 MHz I2C bus systems. The I2C protocol allows slower slave devices to operate on faster buses. However, data transfer rates will be limited to 400 kHz maximum. Verify that application timing requirements do not mandate 1 MHz operation before substitution.

Q2: What is the difference between 8-TSSOP and 8-TSSOP-B packages?

A: Both package types are physically compatible 8-pin thin shrink small outline packages with 0.173" width and 4.40mm body dimension. The 8-TSSOP-B designation indicates Rohm Semiconductor's variant of the standard 8-TSSOP footprint. PCB layout and reflow profiles remain compatible between these package variants.

Q3: Are there voltage supply differences between substitute parts?

A: Yes. The original AT24C32C-TH-T specifies 1.8V minimum supply voltage. Substitute parts vary: 24AA32AF-I/ST and AT24CS32-XHM-T support 1.7V minimum, while BR24G32FVT-3GE2 supports 1.6V minimum. For applications operating below 1.8V, verify the selected substitute part's minimum voltage specification. For standard 3.3V and 5V systems, all substitutes are fully compatible.

Q4: Which substitute part offers the best inventory availability?

A: The BR24G32FVT-3AGE2 (Rohm Semiconductor) provides the highest inventory level at 50,300 pcs in stock. This part operates at 1 MHz with performance equivalent to the original AT24C32C-TH-T and is recommended for high-volume production requirements.

Q5: Can I use parts with extended temperature range (-40°C to 125°C) in standard -40°C to 85°C applications?

A: Yes. Parts with extended temperature range (24AA32AX-I/ST, 24AA32AXT-I/ST) are fully compatible with standard temperature applications. Extended temperature capability provides additional design margin and future flexibility without performance degradation in standard operating conditions.

Q6: What is the significance of MSL (Moisture Sensitivity Level) ratings?

A: MSL 1 (Unlimited) indicates no moisture sensitivity restrictions and no baking requirement before reflow soldering. MSL 3 (168 Hours) requires component baking if exposed to ambient humidity for extended periods. For standard manufacturing environments with controlled humidity, both MSL ratings are acceptable. MSL 1 parts offer simplified handling procedures.

Q7: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance status, ensuring regulatory alignment with the original AT24C32C-TH-T specification and compatibility with modern manufacturing and environmental standards.

Q8: Which substitute provides the fastest access time?

A: The CAT24C32YI-G (onsemi) offers 400 ns access time, which is faster than the original AT24C32C-TH-T (550 ns). This part operates at 1 MHz clock frequency and provides enhanced performance for timing-critical applications while maintaining full backward compatibility.

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