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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology 24CSM01T-E/SM

Name: 24CSM01T-E/SM
Brand: Microchip Technology
SKU: 24CSM01T-E/SM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 24CSM01T-E/SM

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-SOIC (0.209", 5.30mm Width)

Datasheet:: 24CSM01T-E/SM.pdf

Description:: IC EEPROM 1MBIT I2C 8SOIJ

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Product details

Overview

24CSM01T-E/SM from Microchip Technology is a 1-Mbit I²C serial EEPROM with integrated security register, ECC error correction, and AEC-Q100 automotive qualification. It operates from 1.7V to 5.5V, supports up to 3.4 MHz High-Speed I²C mode, and delivers >1 million write cycles with >200-year data retention. Used for secure configuration storage in automotive ECUs and industrial controllers.

For engineers reviewing the 24CSM01T-E/SM datasheet, 24CSM01T-E/SM pinout, 24CSM01T-E/SM application, or 24CSM01T-E/SM equivalent, key selection factors include its factory-programmed 128-bit serial number, software-lockable 256-byte ID page, dual-zone write protection (hardware WP pin + configurable Configuration register), and extended temperature support to +125°C.

Technical Context

The 24CSM01T-E/SM implements a two-wire I²C interface with hardware address inputs A1/A2 enabling up to four devices on one bus. Its memory is organized as 512 pages × 256 bytes, supporting byte and page writes (up to 256 bytes per cycle) with self-timed 5 ms max write duration.

It integrates three dedicated register spaces: a read-only 128-bit serial number (0800h–080Fh), a user-programmable 256-byte lockable ID page (0900h–090Fh), and a Configuration register enabling zone-level write protection across eight 128-Kbit regions - all accessible via distinct device address byte formats defined in Table 3-2.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	1 Mbit (131,072 × 8 bits), organized as 512 pages of 256 bytes each
I²C Speed	Up to 3.4 MHz High-Speed mode (2.5V–5.5V, Industrial temp); also supports 1 MHz / 400 kHz / 100 kHz
Write Endurance	1,000,000 erase/write cycles per memory location (characterized at 25°C)
Data Retention	>200 years at 55°C ambient - validated reliability for long-life automotive deployments
Operating Voltage	1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters
Temperature Range	Extended (E): −40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood automotive use
Security Features	Factory-programmed 128-bit globally unique serial number + 256-byte user-programmable, software-lockable ID page
Error Correction	Built-in ECC corrects up to 1 bit error per 4-byte read; Error Correction State (ECS) latch reports correction events

Pinout & Package

24CSM01T-E/SM is supplied in an 8-lead Wettable Flank VDFN package (3.0 mm × 2.0 mm, 0.5 mm pitch) with exposed thermal pad. Pin 1 = NC, Pin 2 = A1, Pin 3 = A2, Pin 4 = VSS, Pin 5 = SDA, Pin 6 = SCL, Pin 7 = WP, Pin 8 = VCC.

Pin/Terminal	Circuit Role	Design Meaning
NC	No Connect	Unbonded pad; must remain floating - no electrical function or routing required
A1, A2	Hardware Address Inputs	Set 2-bit portion of 7-bit I²C client address; enable up to four devices on same bus when hardwired to VSS/VCC
VSS	Ground Reference	Primary return path for all internal logic and I/O; connect directly to system ground plane
SDA	Serial Data Line	Open-drain bidirectional I²C data line requiring external pull-up resistor (330 Ω typical for 3.4 MHz)
SCL	Serial Clock Input	Input-only clock line synchronized to host MCU; slope control minimizes ground bounce
WP	Write-Protect Control	Hardware lock: tied to VCC disables all writes to EEPROM and Security register; ignored in Enhanced Software Write Protection mode
VCC	Power Supply	Single supply input (1.7–5.5V); powers internal high-voltage generation for EEPROM programming

Key Features

Feature	Design Value
128-bit Factory Serial Number	Read-only, globally unique identifier preprogrammed at wafer test - eliminates manufacturing serialization overhead
Software-Lockable ID Page	256-byte user EEPROM (0900h–090Fh) that can be permanently locked via Configuration register - secures calibration data or firmware keys
Configurable Zone Protection	Eight independent 128-Kbit zones protected individually via Configuration register bits - enables fine-grained access control without hardware changes
Integrated ECC Logic	Corrects single-bit errors during reads and latches correction status in ECS bit - improves functional safety compliance in automotive systems
I²C Manufacturer ID Support	Returns unique 24-bit ID on reserved host code command - enables automatic device identification in multi-EEPROM systems

Applications

Automotive Body Control Module	Industrial PLC Configuration Storage
Use Scenario: Storing calibrated sensor offsets, actuator limits, and vehicle-specific configuration profiles in BCMs operating under hood temperatures up to +125°C. IC Role / Device Role / Timing Role: Nonvolatile configuration memory with AEC-Q100 qualification and ECC - ensures integrity of safety-critical parameters across vehicle lifetime. Use Value: Eliminates need for external serialization and enables traceability via factory 128-bit serial number, reducing BOM count and assembly time.	Use Scenario: Retaining firmware update history, I/O mapping tables, and calibration constants in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Secure, high-reliability EEPROM with software-lockable ID page - prevents unauthorized modification of operational parameters after commissioning. Use Value: Dual protection modes (hardware WP pin + configurable zone locks) allow flexible field-service workflows while maintaining factory-set security boundaries.
Medical Diagnostic Equipment	Smart Energy Metering
Use Scenario: Archiving device calibration certificates, usage logs, and regulatory compliance metadata in Class II medical instruments requiring long-term data integrity. IC Role / Device Role / Timing Role: Trusted nonvolatile memory with >200-year data retention and built-in ECC - satisfies IEC 62304 traceability and reliability requirements. Use Value: Preprogrammed serial number serves as immutable hardware identity for audit trails and regulatory submissions.	Use Scenario: Storing tariff schedules, metering firmware signatures, and tamper-event logs in utility-grade smart meters operating across wide temperature and voltage ranges. IC Role / Device Role / Timing Role: 1.7–5.5V operation and Schmitt-trigger I²C inputs ensure robust communication in noisy grid environments with fluctuating supply rails. Use Value: High-speed 3.4 MHz I²C mode enables rapid firmware updates during maintenance windows without extending downtime.

Automotive Body Control Module

Industrial PLC Configuration Storage

Use Scenario: Storing calibrated sensor offsets, actuator limits, and vehicle-specific configuration profiles in BCMs operating under hood temperatures up to +125°C.

IC Role / Device Role / Timing Role: Nonvolatile configuration memory with AEC-Q100 qualification and ECC - ensures integrity of safety-critical parameters across vehicle lifetime.

Use Value: Eliminates need for external serialization and enables traceability via factory 128-bit serial number, reducing BOM count and assembly time.

Use Scenario: Retaining firmware update history, I/O mapping tables, and calibration constants in programmable logic controllers deployed in factory automation environments.

IC Role / Device Role / Timing Role: Secure, high-reliability EEPROM with software-lockable ID page - prevents unauthorized modification of operational parameters after commissioning.

Use Value: Dual protection modes (hardware WP pin + configurable zone locks) allow flexible field-service workflows while maintaining factory-set security boundaries.

Medical Diagnostic Equipment

Smart Energy Metering

Use Scenario: Archiving device calibration certificates, usage logs, and regulatory compliance metadata in Class II medical instruments requiring long-term data integrity.

IC Role / Device Role / Timing Role: Trusted nonvolatile memory with >200-year data retention and built-in ECC - satisfies IEC 62304 traceability and reliability requirements.

Use Value: Preprogrammed serial number serves as immutable hardware identity for audit trails and regulatory submissions.

Use Scenario: Storing tariff schedules, metering firmware signatures, and tamper-event logs in utility-grade smart meters operating across wide temperature and voltage ranges.

IC Role / Device Role / Timing Role: 1.7–5.5V operation and Schmitt-trigger I²C inputs ensure robust communication in noisy grid environments with fluctuating supply rails.

Use Value: High-speed 3.4 MHz I²C mode enables rapid firmware updates during maintenance windows without extending downtime.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24CS128-MAHM-T	128-Kbit capacity (1/8 size), no Security register, no ECC, only 1 MHz max I²C speed	Lacks factory serial number and software-lockable ID page - insufficient for automotive traceability or secure parameter storage	Select only for cost-sensitive, non-automotive designs where 128 Kbit suffices and ECC/security are not required
BR24G128FJ-WE2	128-Kbit, supports 1 MHz I²C, includes 64-byte ID area but no factory serial number or ECC	Missing 128-bit global serial number and ECC - cannot meet AEC-Q100 functional safety or data integrity requirements	Use only in consumer-grade applications where extended temperature range and cryptographic traceability are unnecessary

Compared with AT24CS128-MAHM-T and BR24G128FJ-WE2, the 24CSM01T-E/SM provides 8× more memory, certified automotive qualification, factory-unique serialization, and ECC - making it the sole option for AEC-Q100-compliant systems requiring secure, long-retention configuration storage.

Availability

24CSM01T-E/SM is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLCs, medical diagnostic equipment, and smart energy metering systems requiring stable component supply across extended temperature and long product lifecycles.

Supply support for 24CSM01T-E/SM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and memory solutions, serving automotive, industrial, and communications markets with vertically integrated silicon and software.

The 24CSM01T-E/SM belongs to Microchip's CS-series automotive EEPROM family, designed specifically for secure, high-reliability nonvolatile storage in safety-critical systems where data integrity, traceability, and extended temperature operation are mandatory.

FAQ

What is the maximum I²C clock frequency supported by the 24CSM01T-E/SM?

The 24CSM01T-E/SM supports up to 3.4 MHz in High-Speed mode when VCC is 2.5V–5.5V and ambient temperature is within the Industrial range (−40°C to +85°C). At 1.7V–2.5V or Extended temperature (−40°C to +125°C), maximum clock frequency is 1 MHz. This allows optimized throughput in automotive and industrial applications without compromising timing margins.

Does the 24CSM01T-E/SM include factory-programmed identification data?

Yes, the 24CSM01T-E/SM includes a factory-programmed, globally unique 128-bit serial number stored in read-only memory (address range 0800h–080Fh). This serial number is guaranteed unique across the entire CS-series EEPROM family and enables zero-cost hardware serialization for traceability in automotive and medical applications.

How does the write protection mechanism work on the 24CSM01T-E/SM?

The 24CSM01T-E/SM offers dual write protection: (1) Hardware-based via the WP pin - tying WP to VCC disables all writes to both main EEPROM and Security register; (2) Software-configurable via the Configuration register - enabling individual lock of eight 128-Kbit zones. The Configuration register itself can be permanently locked to prevent further reconfiguration.

Is the 24CSM01T-E/SM qualified for automotive applications?

Yes, the 24CSM01T-E/SM is AEC-Q100 qualified for Grade 1 (−40°C to +125°C) operation and rated for extended temperature use. It meets automotive reliability requirements including >1 million write cycles, >200-year data retention, and >4 kV ESD protection - making it suitable for under-hood and safety-critical ECU applications.

What is the purpose of the Security register in the 24CSM01T-E/SM?

The Security register in the 24CSM01T-E/SM consists of two sections: a read-only 128-bit serial number (0800h–080Fh) and a 256-byte user-programmable ID page (0900h–090Fh) that can be permanently locked via software. This structure enables secure storage of calibration data, cryptographic keys, or firmware signatures with irreversible protection against field tampering.

24CSM01T-E/SM Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: -

Memory Type:: Non-Volatile

Memory Format:: EEPROM

Technology:: EEPROM

Memory Size:: 1Mbit

Memory Organization:: 128K x 8

Memory Interface:: I2C

Clock Frequency:: 1 MHz

Write Cycle Time - Word, Page:: 5ms

Access Time:: 70 ns

Voltage - Supply:: 1.7V ~ 5.5V

Operating Temperature:: -40°C ~ 125°C (TC)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIJ

24CSM01T-E/SM FAQ

1.How can I place an order for 24CSM01T-E/SM through Aetrix?

Please submit a Request for Quotation (RFQ) for 24CSM01T-E/SM on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 24CSM01T-E/SM reliable?

The price and inventory of 24CSM01T-E/SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24CSM01T-E/SM is usually 5 days.

3.What payment methods are accepted for 24CSM01T-E/SM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CSM01T-E/SM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 24CSM01T-E/SM?

24CSM01T-E/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 24CSM01T-E/SM order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 24CSM01T-E/SM?

For technical support, including 24CSM01T-E/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CSM01T-E/SM requirements.

6.How does Aetrix verify that 24CSM01T-E/SM is sourced from the original manufacturer or authorized distributors?

All 24CSM01T-E/SM products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 24CSM01T-E/SM meets industry standards.

7.What is the process for return or replacement of 24CSM01T-E/SM?

All 24CSM01T-E/SM units undergo pre-shipment inspection (PSI). If there is an issue with 24CSM01T-E/SM, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 24CSM01T-E/SM part is unused and in its original packaging.

Return procedure for 24CSM01T-E/SM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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