AT21CS01-MSHMHU-T Equivalent & Substitute Parts

Part Overview

The AT21CS01-MSHMHU-T is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C and single-wire interface capability at 125 kbps. This component is packaged in a 2-XSFN (5x4.6) surface mount configuration and operates across a supply voltage range of 1.7V to 3.6V with an operating temperature range of -40°C to 85°C. The part maintains Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical specifications and memory organization are maintained while accommodating different packaging requirements or inventory availability.

Key Parameters

Parameter	Specification
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	I2C, Single Wire
Clock Frequency	125 kbps
Write Cycle Time	5ms
Voltage Supply Range	1.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Memory Type	Non-Volatile EEPROM
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

The AT21CS01-STUM10-T qualifies as a direct substitute for the AT21CS01-MSHMHU-T based on the following criteria:

Electrical Equivalence: Both parts share identical memory specifications including 1Kbit capacity, 128 x 8 organization, I2C and single-wire interface support, 125 kbps clock frequency, 5ms write cycle time, 1.7V to 3.6V supply voltage range, and -40°C to 85°C operating temperature range.

Functional Compatibility: Both components are manufactured by Microchip Technology under the same AT21CS01 base product number, ensuring pin-compatible functionality and identical memory access protocols.

Packaging Difference: The primary distinction is the package type. The AT21CS01-MSHMHU-T uses 2-XSFN (5x4.6) packaging, while the AT21CS01-STUM10-T uses SOT-23-3 packaging. Both are surface mount configurations suitable for PCB integration.

Compliance Alignment: Both parts maintain ROHS3 compliance, REACH unaffected status, and EAR99 ECCN classification.

Parameter Comparison

Parameter	AT21CS01-MSHMHU-T	AT21CS01-STUM10-T
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	1Kbit	1Kbit
Memory Organization	128 x 8	128 x 8
Memory Interface	I2C, Single Wire	I2C, Single Wire
Clock Frequency	125 kbps	125 kbps
Write Cycle Time	5ms	5ms
Voltage Supply	1.7V ~ 3.6V	1.7V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount
Package / Case	2-SMD, No Lead (2-XSFN 5x4.6)	TO-236-3, SC-59, SOT-23-3
Product Status	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

Both the AT21CS01-MSHMHU-T and AT21CS01-STUM10-T are Active status components manufactured by Microchip Technology with full ROHS3 compliance and REACH unaffected certification. Selection between these parts should be determined by PCB layout requirements and packaging constraints.

The AT21CS01-MSHMHU-T in 2-XSFN packaging is suitable for applications requiring compact form factor with 5x4.6mm dimensions. The AT21CS01-STUM10-T in SOT-23-3 packaging provides a standard industry package format with improved moisture handling characteristics (MSL 1 versus MSL 3), making it advantageous for applications with extended storage or high-humidity environments prior to assembly.

Both parts maintain identical electrical performance and memory interface specifications, ensuring functional interchangeability within the design constraints of the selected package type.

Frequently Asked Questions (FAQ)

Q: Are the AT21CS01-MSHMHU-T and AT21CS01-STUM10-T pin-compatible?

A: Both parts are manufactured by Microchip Technology under the same AT21CS01 base product number with identical memory interface specifications. Pin compatibility is determined by the package type. The 2-XSFN and SOT-23-3 packages have different physical configurations and pin layouts, requiring PCB redesign for package substitution.

Q: What is the primary difference between these substitute parts?

A: The electrical and functional specifications are identical. The primary difference is the package type: 2-XSFN (5x4.6) versus SOT-23-3. This affects PCB footprint, board space requirements, and moisture sensitivity level during storage.

Q: Can I substitute the AT21CS01-STUM10-T for the AT21CS01-MSHMHU-T without circuit modification?

A: Direct substitution without PCB modification is not possible due to different package types and pin configurations. However, the electrical specifications are fully equivalent, allowing functional replacement with appropriate PCB layout changes.

Q: What does the Moisture Sensitivity Level difference indicate?

A: The AT21CS01-MSHMHU-T has MSL 3 (168 hours maximum floor life), while the AT21CS01-STUM10-T has MSL 1 (unlimited floor life). MSL 1 components tolerate extended exposure to ambient humidity without requiring baking before reflow soldering, reducing manufacturing process constraints.

Q: Are both parts ROHS3 compliant?

A: Yes, both the AT21CS01-MSHMHU-T and AT21CS01-STUM10-T are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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