48LM01T-I/SM

Part Overview

The 48LM01T-I/SM is an EERAM (Electrically Erasable RAM combined with SRAM) memory integrated circuit manufactured by Microchip Technology. This non-volatile memory device features 1Mbit capacity with SPI interface operating at 66 MHz. The product is classified as Obsolete, making identification of compatible substitute components essential for ongoing system support and redesign considerations.

Substiute Parts

48LM01T-I/SM

Microchip TechnologyIn Stock: 107948LM01T-I/SM Datasheet

Current PartRFQ

25LC1024T-E/SM

Microchip TechnologyIn Stock: 586525LC1024T-E/SM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 48LM01T-I/SM is restricted to memory devices meeting the following critical parameters:

Memory Capacity & Organization: The substitute must provide 1Mbit capacity in 128K x 8 organization to ensure direct functional equivalence.

Interface Specification: SPI interface is mandatory. This serial protocol enables direct software and hardware compatibility.

Package Compatibility: The 8-SOIC surface mount package with 0.209" (5.30mm) width ensures mechanical and electrical pin compatibility on printed circuit boards.

Voltage Supply Range: While the 48LM01T-I/SM operates within 2.7V to 3.6V, substitute devices must remain compatible with this voltage specification or provide overlapping supply ranges suitable for the application environment.

Temperature Rating: Operating temperature range must support the required thermal environment, with the primary device rated for -40°C to 85°C.

The 25LC1024T-E/SM qualifies as a functional substitute based on matching memory capacity, organization, SPI interface, and package specifications, despite differences in technology implementation and performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 25LC1024T-E/SM serves as an available substitute for the obsolete 48LM01T-I/SM when component procurement becomes necessary. The substitute maintains identical memory capacity (1Mbit, 128K x 8 organization) and physical package specifications (8-SOIC surface mount).

Both components are manufactured by Microchip Technology and maintain ROHS3 compliance with Moisture Sensitivity Level 1, supporting long-term reliability in standard industrial environments.

The primary technical difference lies in the memory technology implementation: the original 48LM01T-I/SM combines EEPROM with SRAM functionality, while the 25LC1024T-E/SM operates as pure EEPROM. This distinction affects operational characteristics including clock frequency (66 MHz vs. 20 MHz) and voltage supply flexibility (2.7V–3.6V vs. 2.5V–5.5V).

Component selection should account for application-specific requirements regarding clock frequency, voltage supply constraints, and memory retention characteristics before implementation.

Frequently Asked Questions (FAQ)

Q: Can the 25LC1024T-E/SM directly replace the 48LM01T-I/SM in existing designs?

A: Physical and electrical pin compatibility is supported due to matching package specifications (8-SOIC) and memory organization (128K x 8 via SPI interface). However, application review is necessary to validate compatibility with clock frequency requirements and memory technology differences.

Q: What is the primary difference between EERAM and EEPROM memory formats?

A: The 48LM01T-I/SM combines SRAM (volatile) and EEPROM (non-volatile) on a single device, enabling fast random access with data retention. The 25LC1024T-E/SM implements EEPROM only, providing non-volatile storage without integrated SRAM functionality.

Q: Does the 25LC1024T-E/SM support the 66 MHz clock frequency of the original device?

A: The 25LC1024T-E/SM is rated for maximum 20 MHz clock frequency, which is lower than the original 66 MHz specification. Applications dependent on higher clock speeds require separate evaluation.

Q: Are both devices compatible with the same supply voltage range?

A: The 48LM01T-I/SM requires 2.7V to 3.6V supply voltage, while the 25LC1024T-E/SM supports the broader range of 2.5V to 5.5V. Both devices are compatible with 3.3V supply voltages commonly used in embedded systems. Applications operating below 2.7V or above 3.6V must verify compatibility with the substitute device specifications.

Q: What packaging options are available for the 25LC1024T-E/SM substitute?

A: The 25LC1024T-E/SM is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, maintaining the same 8-SOIC surface mount package specification as the original 48LM01T-I/SM.

Q: Are there any compliance or regulatory differences between these components?

A: Both devices maintain ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity classification, and EAR99 export control status. Compliance requirements are equivalent for standard industrial applications.