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Microchip Technology 24CSM01T-I/ST

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

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Part No.:: 24CSM01T-I/ST

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-TSSOP (0.173", 4.40mm Width)

Datasheet:: 24CSM01T-I/ST.pdf

Description:: IC EEPROM 1MBIT I2C 8TSSOP

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Inventory:2,444

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Product details

Overview

24CSM01T-I/ST from Microchip Technology is a 1-Mbit I²C serial EEPROM with integrated security register, ECC error correction, and high-speed 3.4 MHz interface. It operates from 1.7V to 5.5V, supports byte/page writes (up to 256 bytes), and features factory-programmed 128-bit serial number and user-lockable 256-byte ID page. Used in automotive infotainment control modules for firmware versioning and calibration storage.

For engineers reviewing the 24CSM01T-I/ST datasheet, 24CSM01T-I/ST pinout, 24CSM01T-I/ST application, or 24CSM01T-I/ST equivalent, key selection criteria include I²C high-speed mode timing compliance, hardware/software write protection flexibility, ECC-enabled reliability for safety-critical data, and AEC-Q100 qualification for under-hood deployment.

Technical Context

The 24CSM01T-I/ST implements a dual-register architecture: a 1-Mbit main EEPROM array organized as 512 × 256-byte pages, and a separate 4-Kbit security register split into read-only 128-bit serial number (0800h–080Fh) and user-programmable lockable ID page (0900h–090Fh). Its I²C interface supports four device address modes - standard EEPROM access, security register access, configuration register access, and manufacturer ID read - each requiring distinct 7-bit address byte formats and word address bit patterns.

Write protection is configurable via hardware (WP pin) or software (Configuration register), enabling zone-level locking of eight independent 128-Kbit memory regions. Built-in ECC corrects single-bit errors within any 4-byte read window and latches error occurrence status in the Configuration register's Error Correction State (ECS) bit, providing deterministic fault detection without host intervention.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	1 Mbit (131,072 × 8 bits), organized as 512 pages of 256 bytes - enables efficient bulk parameter storage with page-aligned updates.
I²C Speed	Up to 3.4 MHz (High-Speed mode), 1 MHz (Fast mode), 400 kHz (Standard mode) - supports real-time calibration logging in fast-boot systems.
Write Cycle Time	≤5 ms per byte or page - ensures predictable latency during firmware update sequences without blocking host CPU.
Operating Voltage	1.7 V to 5.5 V - compatible with 1.8 V logic domains and legacy 5 V automotive subsystems without level shifting.
Data Retention	>200 years at 55°C - guarantees long-term integrity of vehicle VIN, calibration IDs, and service history across product lifetime.
Endurance	1,000,000 write cycles - supports daily recalibration logging over 27+ years of continuous operation.
Temperature Range	Industrial grade: –40°C to +85°C - validated for engine control unit (ECU) and body control module (BCM) mounting locations.
AEC-Q100 Grade	Qualified per AEC-Q100 Rev G - meets automotive electronics stress testing requirements for vibration, thermal cycling, and ESD robustness.

Pinout & Package

24CSM01T-I/ST is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with wettable flank leads, optimized for automated optical inspection (AOI) and solder joint reliability in automotive PCB assembly.

Pin/Terminal	Circuit Role	Design Meaning
1: NC	No Connect	Unused pad; must remain unconnected to avoid parasitic coupling or latch-up risk.
2: A1	Hardware Address Input	Configures bit A1 of 7-bit I²C client address; tied to VSS or VCC to select one of four devices on shared bus.
3: A2	Hardware Address Input	Configures bit A2 of 7-bit I²C client address; used with A1 to enable up to four 24CSM01T-I/ST devices on same I²C bus.
4: VSS	Ground Reference	Primary return path for all internal circuits; requires low-impedance connection to system ground plane.
5: SDA	Serial Data Line	Open-drain bidirectional I²C data line; requires external pull-up resistor (330 Ω for 3.4 MHz operation).
6: SCL	Serial Clock Line	Input-only I²C clock line; slope-controlled to suppress ground bounce in noisy automotive environments.
7: WP	Write-Protect Control	Hardware lock: tied to VCC disables all writes; overridden by Enhanced Software Write Protection when Configuration register is locked.
8: VCC	Power Supply	1.7–5.5 V supply input; decoupling capacitor (100 nF ceramic) required within 5 mm of pin per layout guidelines.

Key Features

Feature	Design Value
Factory-Programmed 128-Bit Serial Number	Unique identifier preloaded in Security register (0800h–080Fh); eliminates manufacturing-line serialization overhead and enables secure device binding.
User-Programmable Lockable ID Page	256-byte EEPROM section (0900h–090Fh) that can be permanently write-locked via software sequence - ideal for storing immutable calibration keys or cryptographic seeds.
Built-In ECC Logic with ECS Latch	Corrects single-bit errors in any 4-byte read; sets Error Correction State (ECS) flag in Configuration register - provides traceable error reporting without host polling overhead.
Enhanced Software Write Protection	Configurable via Configuration register to protect eight independent 128-Kbit zones; allows fine-grained locking of critical firmware parameters while leaving others field-updatable.
I²C Manufacturer Identification Function	Returns unique 24-bit ID on reserved host code command (1111100R/W); enables runtime verification of device authenticity in secure boot chains.
Schmitt Trigger Inputs with Slope Control	SDA/SCL inputs reject noise spikes ≤100 ns (I-temp); output edge rate controlled to limit ground bounce in high-current automotive PCBs.

Applications

Automotive ECU Calibration Storage	Industrial PLC Configuration Backup
Use Scenario: Storing engine map coefficients, sensor offset values, and adaptive learning parameters in powertrain control units. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during cold boot and runtime recalibration; ECC ensures data integrity after thermal cycling. Use Value: Enables zero-defect calibration retention over 15-year vehicle life without periodic refresh, meeting ISO 26262 ASIL-B data integrity requirements.	Use Scenario: Preserving ladder logic configurations, I/O mapping tables, and alarm thresholds in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Fail-safe backup memory that retains settings during unexpected AC loss or brownout events. Use Value: Eliminates need for supercapacitor-based backup circuitry; reduces BOM cost and board space while maintaining <100 µs restore time from power recovery.
Medical Device Usage Logging	Smart Meter Firmware Versioning
Use Scenario: Recording sterilization cycles, usage hours, and diagnostic event timestamps in portable infusion pumps and ventilators. IC Role / Device Role / Timing Role: Tamper-resistant audit log with write-once capability for regulatory compliance (FDA 21 CFR Part 11). Use Value: Preprogrammed serial number binds log entries to specific hardware unit; lockable ID page stores cryptographic signatures for FDA audit trail validation.	Use Scenario: Storing firmware revision identifiers, cryptographic keys, and tariff schedule versions in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure boot root-of-trust component verifying firmware signature before execution. Use Value: Manufacturer ID register enables field validation of authentic Microchip silicon; ECC prevents undetected corruption of public key certificates during OTA updates.

Automotive ECU Calibration Storage

Industrial PLC Configuration Backup

Use Scenario: Storing engine map coefficients, sensor offset values, and adaptive learning parameters in powertrain control units.

IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during cold boot and runtime recalibration; ECC ensures data integrity after thermal cycling.

Use Value: Enables zero-defect calibration retention over 15-year vehicle life without periodic refresh, meeting ISO 26262 ASIL-B data integrity requirements.

Use Scenario: Preserving ladder logic configurations, I/O mapping tables, and alarm thresholds in programmable logic controllers deployed in factory automation.

IC Role / Device Role / Timing Role: Fail-safe backup memory that retains settings during unexpected AC loss or brownout events.

Use Value: Eliminates need for supercapacitor-based backup circuitry; reduces BOM cost and board space while maintaining <100 µs restore time from power recovery.

Medical Device Usage Logging

Smart Meter Firmware Versioning

Use Scenario: Recording sterilization cycles, usage hours, and diagnostic event timestamps in portable infusion pumps and ventilators.

IC Role / Device Role / Timing Role: Tamper-resistant audit log with write-once capability for regulatory compliance (FDA 21 CFR Part 11).

Use Value: Preprogrammed serial number binds log entries to specific hardware unit; lockable ID page stores cryptographic signatures for FDA audit trail validation.

Use Scenario: Storing firmware revision identifiers, cryptographic keys, and tariff schedule versions in ANSI C12.22-compliant electricity meters.

IC Role / Device Role / Timing Role: Secure boot root-of-trust component verifying firmware signature before execution.

Use Value: Manufacturer ID register enables field validation of authentic Microchip silicon; ECC prevents undetected corruption of public key certificates during OTA updates.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24CS128-SSHL-T	128 Kbit capacity (1/8 size), no built-in ECC, no security register, only 1 MHz I²C max speed	Lacks serial number, ID page, and ECC - unsuitable for automotive or medical audit logging	Select only for cost-sensitive consumer applications where data integrity and traceability are non-critical
BR24G128FJ-WE2	128 Kbit, supports 1 MHz I²C, includes 64-byte security register but no factory serial number or ECC	Missing 128-bit global uniqueness and error correction - cannot meet AEC-Q100 functional safety requirements	Use only in industrial temperature-range applications where full automotive qualification is not mandated

Compared with AT24CS128-SSHL-T and BR24G128FJ-WE2, the 24CSM01T-I/ST delivers 8× more memory, deterministic ECC error handling, globally unique serialization, and AEC-Q100 certification - making it the sole option for ASIL-B-compliant automotive firmware storage and FDA-regulated medical device logging.

Availability

24CSM01T-I/ST is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC configuration backup, and medical device usage logging requiring stable component supply and long-term lifecycle support.

Supply support for 24CSM01T-I/ST 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, FPGA, and memory solutions, serving automotive, industrial, communications, and consumer markets with vertically integrated silicon and software platforms.

The 24CSM01T-I/ST belongs to Microchip's CS-series automotive-grade serial EEPROM family, designed specifically to replace legacy parallel EEPROMs in safety-critical systems requiring guaranteed data integrity, cryptographic binding, and extended temperature operation.

FAQ

What is the maximum I²C clock frequency supported by the 24CSM01T-I/ST?

The 24CSM01T-I/ST supports up to 3.4 MHz in High-Speed mode when operating at VCC ≥ 2.5 V and within the industrial temperature range (–40°C to +85°C). At lower voltages (1.7–2.5 V) or extended temperature (–40°C to +125°C), the maximum clock frequency is limited to 1 MHz. This dual-speed capability allows designers to optimize between throughput and power consumption based on system constraints.

How does the 24CSM01T-I/ST implement error correction, and what does the ECS latch indicate?

The 24CSM01T-I/ST uses built-in ECC logic that corrects up to one bit error within any 4-byte read window. When ECC correction is invoked during a read operation, the Error Correction State (ECS) latch in the Configuration register is set to '1' and remains asserted until cleared by a host write to the register. This provides a hardware-verified flag for diagnostics without requiring software parity checks or CRC overhead.

Can the factory-programmed 128-bit serial number in the 24CSM01T-I/ST be overwritten or modified?

No - the 128-bit serial number in the 24CSM01T-I/ST is factory-programmed into the Security register at wafer test and is permanently read-only. It occupies addresses 0800h–080Fh and cannot be altered, erased, or reprogrammed by any command sequence. This ensures cryptographic binding of the device identity to stored data across its entire operational lifetime.

What is the function of the WP pin on the 24CSM01T-I/ST, and how does it interact with software write protection?

The WP (Write-Protect) pin on the 24CSM01T-I/ST provides hardware-level write inhibition when tied to VCC. However, when Enhanced Software Write Protection is enabled via the Configuration register, the WP pin is ignored - protection is then enforced solely by software-configured zone locks. This dual-mode architecture allows legacy designs to retain hardware protection while new designs leverage flexible, field-updatable software policies.

Is the 24CSM01T-I/ST pin-compatible with other Microchip serial EEPROMs such as the 24AA1025 or 24LC1025?

No - the 24CSM01T-I/ST is not pin-compatible with 24AA1025 or 24LC1025. While all three use 8-lead SOIC packages, the 24CSM01T-I/ST assigns Pin 1 as NC (No Connect), whereas 24AA1025/24LC1025 use Pin 1 as A0 address input. Additionally, the 24CSM01T-I/ST's Security register addressing, ECC behavior, and Configuration register structure require distinct firmware initialization sequences not present in legacy parts.

24CSM01T-I/ST Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-TSSOP (0.173", 4.40mm 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:: 3.4 MHz

Write Cycle Time - Word, Page:: 5ms

Access Time:: 400 ns

Voltage - Supply:: 1.7V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TC)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

24CSM01T-I/ST FAQ

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

Please submit a Request for Quotation (RFQ) for 24CSM01T-I/ST 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-I/ST reliable?

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

3.What payment methods are accepted for 24CSM01T-I/ST?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 24CSM01T-I/ST?

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

Once your 24CSM01T-I/ST 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-I/ST?

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

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

All 24CSM01T-I/ST 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-I/ST meets industry standards.

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

All 24CSM01T-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24CSM01T-I/ST, 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-I/ST part is unused and in its original packaging.

Return procedure for 24CSM01T-I/ST:

1.Submit a request within 90 days.

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

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