24LC515T-I/SM EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC515T-I/SM is a 512Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface communication at 400 kHz clock frequency. This non-volatile memory device is designed for applications requiring persistent data storage with low power consumption and wide voltage supply range (2.5V to 5.5V). The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when enhanced performance characteristics (higher clock frequency, faster access time, or extended temperature range) are needed for specific application requirements.

Key Parameters

Parameter	24LC515T-I/SM
Memory Size	512Kbit
Memory Organization	64K x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5 ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution compatibility for the 24LC515T-I/SM is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 512Kbit (64K x 8 organization)
Memory Interface: I2C protocol
Package / Case: 8-SOIC form factor with 0.209" (5.30mm) width
Mounting Type: Surface Mount
Write Cycle Time: 5 ms (standard for this memory class)

Performance Variation Parameters:

Clock Frequency: 400 kHz (baseline) to 1 MHz (enhanced)
Access Time: 900 ns (baseline) to 400 ns (enhanced)
Voltage Supply Range: 2.5V ~ 5.5V (baseline) to 1.7V ~ 5.5V (extended low voltage)
Operating Temperature: -40°C ~ 85°C (baseline) to -40°C ~ 125°C (extended high temperature)

Compliance Parameters:

RoHS Status: ROHS3 Compliant (all substitutes)
MSL Rating: 1 (Unlimited) preferred; MSL 3 (168 Hours) acceptable with handling considerations

Substitute parts maintain identical memory capacity, I2C interface, and 8-SOIC package footprint. Variations in clock frequency, access time, voltage range, and temperature rating represent performance enhancements or extended operational boundaries rather than functional incompatibilities.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	MSL	Product Status
24LC515T-I/SM	Microchip	512Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1	Active
24LC515-I/SM	Microchip	512Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1	Active
24AA512T-I/SM	Microchip	512Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1	Active
24FC512T-I/SM	Microchip	512Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1	Active
24LC512-I/SM	Microchip	512Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1	Active
24LC512T-E/SM	Microchip	512Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	1	Active
24LC512T-I/SM	Microchip	512Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1	Active
AT24C512C-SHD-T	Microchip	512Kbit	1 MHz	550 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	3	Active
CAT24C512XI-T2	onsemi	512Kbit	1 MHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	3	Active
M24512-WMN6TP	STMicroelectronics	512Kbit	1 MHz	500 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1	Not For New Designs

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical and Thermal Characteristics):

24LC515-I/SM and 24LC512T-I/SM are direct functional equivalents to 24LC515T-I/SM, differing only in packaging format (Tube versus Cut Tape & Digi-Reel). Both maintain identical electrical specifications, temperature range, and MSL rating. Selection between these parts depends on procurement quantity requirements and assembly process compatibility.

Enhanced Performance Substitutes (Higher Clock Frequency, Faster Access Time):

24FC512T-I/SM provides 1 MHz clock frequency and 400 ns access time compared to the baseline 400 kHz and 900 ns. This part extends the lower voltage supply boundary to 1.7V. Electrical and thermal compatibility is maintained. Use this part when faster I2C communication is required.

24LC512T-E/SM maintains baseline clock frequency and access time but extends the operating temperature range to -40°C ~ 125°C. This part is suitable for applications requiring high-temperature operation beyond standard industrial range.

Extended Voltage Range Substitute:

24AA512T-I/SM operates at 1.7V minimum supply voltage compared to 2.5V baseline, enabling operation in low-power battery applications. Clock frequency, access time, and temperature range remain identical to the main part.

Cross-Manufacturer Substitutes:

CAT24C512XI-T2 (onsemi) and M24512-WMN6TP (STMicroelectronics) provide 512Kbit I2C EEPROM functionality in 8-SOIC packages. CAT24C512XI-T2 operates at 1 MHz with 1.8V minimum supply voltage and MSL 3 rating. M24512-WMN6TP is designated "Not For New Designs" and should be avoided for new applications despite high inventory availability.

AT24C512C-SHD-T (Microchip) offers 1 MHz operation with 550 ns access time but carries MSL 3 rating requiring controlled moisture exposure during storage and assembly.

Compliance and Verification Status:

All recommended substitutes maintain ROHS3 compliance. Microchip parts 24LC515T-I/SM, 24LC515-I/SM, 24AA512T-I/SM, 24FC512T-I/SM, 24LC512-I/SM, 24LC512T-E/SM, and 24LC512T-I/SM are verified as DiGi-Electronics Programmable. CAT24C512XI-T2 is verified; AT24C512C-SHD-T and M24512-WMN6TP are not verified for DiGi-Electronics programming.

Frequently Asked Questions (FAQ)

Q: Can I use 24LC512T-I/SM as a direct replacement for 24LC515T-I/SM?

A: Yes. Both parts are Microchip 512Kbit I2C EEPROMs in 8-SOIC packages with identical electrical specifications (400 kHz, 900 ns access time, 2.5V ~ 5.5V supply, -40°C ~ 85°C operating range). The difference is the base product number designation (24LC512 versus 24LC515), which does not affect functional compatibility.

Q: What is the difference between Cut Tape & Digi-Reel and Tube packaging?

A: Both packaging formats contain identical die and electrical specifications. Cut Tape & Digi-Reel packaging is supplied on continuous tape suitable for automated pick-and-place assembly equipment. Tube packaging is supplied in plastic tubes for manual handling or lower-volume assembly processes. Selection depends on assembly methodology and procurement volume.

Q: Can I substitute a 1 MHz part (24FC512T-I/SM) for the baseline 400 kHz part (24LC515T-I/SM)?

A: Yes. The 24FC512T-I/SM is a functional superset of the 24LC515T-I/SM. It operates at higher clock frequency (1 MHz versus 400 kHz) and faster access time (400 ns versus 900 ns), making it compatible with any application designed for the baseline part. The extended lower voltage range (1.7V minimum) provides additional operational flexibility.

Q: What does MSL 3 rating mean for AT24C512C-SHD-T?

A: MSL 3 (Moisture Sensitivity Level 3) indicates the part requires controlled moisture exposure for 168 hours maximum after packaging opening. This part must be stored in dry conditions and baked before reflow soldering if exposed to ambient humidity for extended periods. MSL 1 parts (unlimited moisture sensitivity) do not require these precautions.

Q: Why is M24512-WMN6TP marked "Not For New Designs"?

A: This STMicroelectronics part is in legacy status and no longer recommended for new product development. Although inventory is available, Microchip equivalents (24LC512T-I/SM, 24FC512T-I/SM) are preferred for new designs due to active product status and verified programmability.

Q: Can I use CAT24C512XI-T2 (onsemi) in place of 24LC515T-I/SM (Microchip)?

A: Yes, with considerations. The CAT24C512XI-T2 provides identical 512Kbit capacity and I2C interface in 8-SOIC package. It operates at 1 MHz (faster than baseline 400 kHz) with extended lower voltage range (1.8V minimum). However, it carries MSL 3 rating and is not verified for DiGi-Electronics programming. Use this part only when Microchip equivalents are unavailable and moisture control procedures are implemented.

Q: What is the minimum voltage supply difference between 24LC515T-I/SM and 24AA512T-I/SM?

A: 24LC515T-I/SM operates at 2.5V minimum; 24AA512T-I/SM operates at 1.7V minimum. The 24AA512T-I/SM is suitable for battery-powered applications operating below 2.5V. All other electrical specifications remain identical.

Q: Can I use 24LC512T-E/SM for applications requiring extended temperature range?

A: Yes. The 24LC512T-E/SM extends the maximum operating temperature to 125°C compared to 85°C for the baseline 24LC515T-I/SM. All other specifications (400 kHz clock, 900 ns access time, 2.5V ~ 5.5V supply) remain identical. This part is suitable for automotive and industrial applications requiring high-temperature operation.

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