AT21CS01-SSHM12-T Equivalent & Substitute Parts

Part Overview

The AT21CS01-SSHM12-T is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C and Single Wire interface capability at 125 kbps clock frequency. This component is classified as non-volatile memory with 128 x 8 bit organization, housed in an 8-SOIC surface mount package. The part maintains Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when equivalent memory capacity, interface compatibility, and package specifications align within the allowed electrical and mechanical parameters for this EEPROM category.

Substiute Parts

AT21CS01-SSHM12-T

Microchip TechnologyIn Stock: 963AT21CS01-SSHM12-T Datasheet

Current PartRFQ

24AA01T-I/SN

Microchip TechnologyIn Stock: 1908924AA01T-I/SN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT21CS01-SSHM12-T is determined by the following critical parameters:

• Memory capacity must equal 1Kbit with 128 x 8 organization
• Package must be 8-SOIC with identical 0.154" (3.90mm) width
• Memory interface must support I2C protocol
• Surface mount mounting type required
• Operating temperature range must encompass -40°C ~ 85°C minimum
• Supply voltage range must be compatible with system requirements
• RoHS3 compliance and MSL rating must be maintained

The substitute part 24AA01T-I/SN meets these criteria through identical memory capacity, organization, package specification, and I2C interface support. Differences in clock frequency (400 kbps vs. 125 kbps) and supply voltage range (1.7V ~ 5.5V vs. 1.7V ~ 3.6V) represent enhanced capabilities that maintain backward compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both AT21CS01-SSHM12-T and 24AA01T-I/SN maintain Active product status with identical RoHS3 compliance and MSL ratings, ensuring long-term availability and environmental regulatory alignment. The 24AA01T-I/SN substitute provides enhanced clock frequency capability (400 kbps) and extended supply voltage range (1.7V ~ 5.5V), supporting broader system integration scenarios while maintaining identical memory capacity, organization, and package footprint. Selection between these parts depends on system clock frequency requirements and supply voltage specifications. Both parts are suitable for applications requiring 1Kbit EEPROM functionality in 8-SOIC surface mount configurations.

Frequently Asked Questions (FAQ)

Q: Can 24AA01T-I/SN replace AT21CS01-SSHM12-T in existing designs?

A: Yes. Both parts share identical memory capacity (1Kbit), organization (128 x 8), I2C interface support, package type (8-SOIC), and operating temperature range (-40°C ~ 85°C). The substitute offers higher clock frequency (400 kbps) and wider supply voltage range (1.7V ~ 5.5V), providing enhanced performance within the same physical footprint.

Q: What are the key differences between these parts?

A: The primary differences are clock frequency (125 kbps vs. 400 kbps) and supply voltage range (1.7V ~ 3.6V vs. 1.7V ~ 5.5V). The 24AA01T-I/SN substitute provides faster I2C communication speed and compatibility with higher supply voltages. Both maintain identical write cycle time (5ms) and package specifications.

Q: Are package dimensions identical?

A: Yes. Both parts use 8-SOIC packaging with 0.154" (3.90mm) width, ensuring identical PCB footprint and mounting compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both AT21CS01-SSHM12-T and 24AA01T-I/SN are RoHS3 compliant, REACH unaffected, and carry MSL rating 3 (168 Hours), meeting identical environmental and regulatory requirements.

Q: Which part should be selected for new designs?

A: Selection depends on system requirements. If clock frequency of 125 kbps is sufficient and supply voltage remains within 1.7V ~ 3.6V, either part is acceptable. For systems requiring higher I2C speeds or operating at voltages above 3.6V, the 24AA01T-I/SN substitute is the appropriate choice.