Equivalent & Substitute Parts for 11LC040T-I/TT

Part Overview

The 11LC040T-I/TT is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring single-wire interface operation at 100 kHz. This non-volatile memory device is housed in a SOT-23-3 surface mount package and operates across a supply voltage range of 2.5V to 5.5V with an operating temperature range of -40°C to 85°C. The device is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level rating.

Substitute parts are identified when equivalent memory capacity, interface type, package configuration, and core electrical specifications align within the allowed parameter tolerances for this EEPROM category.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	Single Wire
Clock Frequency	100 kHz
Write Cycle Time	5ms
Package / Case	SOT-23-3
Mounting Type	Surface Mount
Memory Type	Non-Volatile EEPROM

Substitute Part Grouping Explanation

Substitution eligibility for the 11LC040T-I/TT is determined by strict alignment of the following parameters:

Memory capacity: 4Kbit with 512 x 8 organization
Interface protocol: Single Wire at 100 kHz operation
Package type: SOT-23-3 surface mount configuration
Memory technology: EEPROM non-volatile format
Write cycle time: 5ms word/page write specification
RoHS and REACH compliance status

Substitute parts must maintain identical memory specifications, interface characteristics, and package footprint. Variations in supply voltage range and operating temperature range are permitted when the substitute part encompasses the main part's specifications or operates within compatible system requirements.

Parameter Comparison

Parameter	11LC040T-I/TT	11AA040T-I/TT	11LC040T-E/TT
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Memory Size	4Kbit	4Kbit	4Kbit
Memory Organization	512 x 8	512 x 8	512 x 8
Memory Interface	Single Wire	Single Wire	Single Wire
Clock Frequency	100 kHz	100 kHz	100 kHz
Write Cycle Time	5ms	5ms	5ms
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Voltage - Supply	2.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All three parts—11LC040T-I/TT, 11AA040T-I/TT, and 11LC040T-E/TT—are manufactured by Microchip Technology and maintain active product status with full RoHS3 compliance and REACH unaffected designation.

The 11AA040T-I/TT extends the minimum supply voltage specification to 1.8V, enabling operation in lower-voltage applications while maintaining the same upper voltage limit of 5.5V. This part is suitable for systems requiring extended low-voltage operation.

The 11LC040T-E/TT extends the maximum operating temperature to 125°C, compared to 85°C for the main part. This variant is appropriate for high-temperature industrial or automotive applications requiring enhanced thermal performance.

Selection between these substitutes depends on system-level requirements for supply voltage range and operating temperature range. All parts share identical memory capacity, interface protocol, package configuration, and write cycle characteristics.

Frequently Asked Questions (FAQ)

Q: Can 11AA040T-I/TT replace 11LC040T-I/TT in all applications?

A: The 11AA040T-I/TT is functionally equivalent for applications operating within the 2.5V to 5.5V supply range. The extended lower voltage specification of 1.8V to 5.5V on the 11AA040T-I/TT provides additional flexibility for low-voltage system designs. Both parts operate identically at 2.5V and above.

Q: What is the primary difference between 11LC040T-E/TT and 11LC040T-I/TT?

A: The 11LC040T-E/TT operates across an extended temperature range of -40°C to 125°C, whereas the 11LC040T-I/TT operates from -40°C to 85°C. All other electrical and functional specifications remain identical. The E-grade variant is specified for applications requiring sustained operation at elevated temperatures.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the SOT-23-3 package configuration with identical pinout and footprint, enabling direct board-level substitution without layout modifications.

Q: Do supply voltage differences affect memory performance?

A: Memory performance parameters including write cycle time (5ms), clock frequency (100 kHz), and data retention characteristics remain constant across the specified supply voltage ranges for each part. System design must ensure supply voltage remains within the specified range for the selected part.

Q: Are there inventory considerations for part selection?

A: Inventory availability should be evaluated based on current stock levels and supply chain requirements. All three parts are currently in active production with available inventory.

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