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Microchip Technology 24CSM01T-E/MS
- Part No.:
- 24CSM01T-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
24CSM01T-E/MS.pdf
- Description:
- IC EEPROM 1MBIT I2C 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,494
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Product details
Overview
24CSM01T-E/MS from Microchip Technology is a 1-Mbit I²C serial EEPROM with 3.4 MHz high-speed mode support, factory-programmed 128-bit unique serial number, built-in ECC for single-bit error correction, and dual write protection (hardware WP pin + software-configurable zone locking). It operates from 1.7V to 5.5V and is AEC-Q100 qualified for automotive use.
For engineers reviewing the 24CSM01T-E/MS datasheet, 24CSM01T-E/MS pinout, 24CSM01T-E/MS application, or 24CSM01T-E/MS equivalent, key selection considerations include its extended temperature range (–40°C to +125°C), 8-lead MSOP package with wettable flank option, 256-byte lockable ID page in Security register, and compatibility with legacy and enhanced software write protection modes.
Technical Context
The 24CSM01T-E/MS implements a two-wire I²C interface with hardware address inputs (A1/A2) enabling up to four devices on one bus, and supports both standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes. Its memory is organized as 512 pages × 256 bytes, with separate 4-Kbit Security register containing read-only 128-bit serial number and user-programmable lockable ID page.
It features a Configuration register that controls write protection behavior-configurable per eight 128-Kbit zones-and includes Error Correction State (ECS) latch indicating ECC invocation. The device uses internal high-voltage generation for write operations and incorporates Schmitt-trigger inputs and slope-controlled outputs for noise immunity and ground-bounce suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (131,072 × 8 bits), organized as 512 pages of 256 bytes each - enables efficient bulk writes without crossing page boundaries. |
| I²C Speed | Up to 3.4 MHz (High-Speed mode), also supports 1 MHz / 400 kHz / 100 kHz - ensures compatibility across legacy and high-throughput systems. |
| Write Cycle Time | ≤5 ms max (byte or page) - defines minimum interval between successive write commands; self-timed and non-blocking after Stop condition. |
| Operating Voltage | 1.7V to 5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifting. |
| Temperature Range | –40°C to +125°C (Extended grade) - validated for under-hood automotive and industrial edge environments. |
| Data Retention | >200 years at 55°C - guarantees long-term firmware or calibration data integrity in unpowered storage. |
| Endurance | 1,000,000 erase/write cycles - sufficient for frequent configuration updates in field-upgradable systems. |
Pinout & Package
24CSM01T-E/MS is packaged in an 8-lead MSOP (Mini Small Outline Package) with wettable flank leads for automated optical inspection (AOI) and improved solder joint reliability. Pin 1 is marked by a beveled corner or dot; the exposed pad is optional and may be connected to VSS or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No Connect | Unbonded pin; must be left unconnected or tied to VSS/VCC only if required by PCB layout constraints. |
| A1, A2 | Hardware Address Inputs | Set 2-bit portion of 7-bit I²C slave address; hardwire to VSS or VCC to select among up to four devices on same bus. |
| VSS | Ground Reference | Primary return path for all internal circuitry; requires low-impedance connection to system ground plane. |
| SDA | Serial Data Line | Open-drain bidirectional I²C data line; requires external pull-up resistor (330Ω for 3.4 MHz). |
| SCL | Serial Clock Input | Input-only clock line synchronized to host MCU; slope control minimizes ground bounce during transitions. |
| WP | Write-Protect Control | Active-high hardware lock: tie to VCC to disable all writes to memory and Security register; ignored in Enhanced Software Write Protection mode. |
| VCC | Power Supply | Core supply input (1.7–5.5V); decoupling capacitor (100 nF ceramic) required within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Serial Number | Globally unique 128-bit read-only identifier stored in Security register - eliminates need for external serialization during manufacturing. |
| Lockable User ID Page | 256-byte programmable section of Security register that can be permanently locked via software sequence - secures calibration data or cryptographic keys against overwrite. |
| Built-In ECC Logic | Corrects up to one bit error per 4-byte read; ECS latch in Configuration register signals correction event - improves data integrity in electrically noisy environments. |
| Configurable Zone Protection | Eight independent 128-Kbit memory zones can be individually write-protected via Configuration register - enables fine-grained access control for multi-application firmware partitions. |
| I²C Manufacturer ID Support | Returns unique 24-bit manufacturer code on request - allows runtime identification of 24CSM01T-E/MS versus other EEPROMs on shared bus. |
Applications
| Automotive Telematics Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing vehicle-specific calibration parameters, IMEI, and firmware version identifiers in a telematics control unit operating under hood temperatures up to +125°C. IC Role / Device Role / Timing Role: Nonvolatile configuration memory with guaranteed data retention >200 years and AEC-Q100 qualification for functional safety-critical subsystems. Use Value: Eliminates need for external serialization hardware and enables secure, tamper-resistant storage of regulatory-compliant identifiers using preprogrammed 128-bit serial number. | Use Scenario: Retaining I/O mapping tables, PID tuning coefficients, and network settings across power cycles in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: High-reliability parameter store supporting up to 1 million write cycles and ECC-protected reads in harsh EMI environments. Use Value: Prevents configuration corruption during brownouts via built-in POR and TPUP timing compliance, while Schmitt-trigger inputs suppress electrical noise on factory floor wiring. |
| Smart Meter Firmware Vault | Medical Infusion Pump Calibration |
Use Scenario: Securing metering algorithm updates and tariff tables in utility-grade smart electricity meters deployed in outdoor enclosures. IC Role / Device Role / Timing Role: Dual-protection EEPROM with hardware WP pin for full-array lockdown and software-configurable zone locks for firmware partitioning. Use Value: Enables irreversible locking of critical calibration data via 256-byte ID page, satisfying IEC 62056-21 security requirements for revenue-grade metering. | Use Scenario: Storing dose calibration constants, operator audit logs, and device serial traceability data in Class II medical infusion pumps requiring ISO 13485 compliance. IC Role / Device Role / Timing Role: RoHS-compliant, extended-temperature EEPROM with >200-year data retention and ECC for patient-critical parameter integrity. Use Value: Provides auditable, non-erasable device identity via factory-programmed 128-bit serial number and lockable ID page - meets FDA 21 CFR Part 11 electronic record requirements. |
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 MHz max I²C speed, no built-in ECC or 128-bit serial number | Lacks automotive qualification and extended temperature support; suitable only for cost-sensitive consumer designs | Select only when memory size ≤128 Kbit suffices and ECC/security features are unnecessary. |
| BR24G128FJ-WE2 | 128-Kbit, supports 1 MHz I²C, includes 128-bit ID but no configurable zone protection or ECC | RoHS-compliant and AEC-Q100 qualified, but lacks 24CSM01T-E/MS's 1-Mbit density and software-lockable ID page | Choose for automotive applications needing basic ID functionality at lower density and cost. |
Compared with AT24CS128-MAHM-T and BR24G128FJ-WE2, the 24CSM01T-E/MS delivers 8× higher density, integrated ECC, and granular software-based write protection - making it uniquely suited for next-generation automotive and industrial systems requiring secure, high-endurance, extended-temperature nonvolatile storage.
Availability
24CSM01T-E/MS is available at Aetrix Electronics and suitable for automotive telematics, industrial PLCs, smart metering, and medical device calibration requiring stable component supply across extended temperature and long product lifecycles.
Supply support for 24CSM01T-E/MS 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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.
The 24CSM01T-E/MS belongs to Microchip's CS-series serial EEPROM family, engineered specifically for automotive and industrial applications demanding high reliability, security, and extended temperature operation - including AEC-Q100 qualification and built-in ECC.
FAQ
What is the maximum I²C clock frequency supported by the 24CSM01T-E/MS?
The 24CSM01T-E/MS supports up to 3.4 MHz in High-Speed mode when VCC ≥2.5V and operating in Industrial temperature range. At 1.7V ≤ VCC < 2.5V, maximum clock frequency is 1 MHz. This allows flexible integration with both legacy and high-performance microcontrollers without protocol translation.
Does the 24CSM01T-E/MS require external pull-up resistors on SDA and SCL lines?
Yes, the 24CSM01T-E/MS requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. For 3.4 MHz operation, a 330Ω resistor is recommended; for 1 MHz, 2 kΩ; and for 100 kHz, 10 kΩ - all referenced to VCC. Proper sizing ensures signal integrity and timing compliance.
How is the 128-bit serial number in the 24CSM01T-E/MS used and accessed?
The 128-bit serial number in the 24CSM01T-E/MS is factory-programmed, globally unique, and stored in the first 16 bytes (0800h–080Fh) of the Security register. It is read-only and accessed via I²C using the Security register device address (1011b prefix). This eliminates post-manufacturing serialization effort and enables secure device identification in fleet management systems.
Can the 24CSM01T-E/MS be used in both hardware and software write protection modes simultaneously?
No - the 24CSM01T-E/MS operates in either Legacy Hardware Write Protection mode (using the WP pin) or Enhanced Software Write Protection mode (configured via the Configuration register), but not both simultaneously. The Configuration register selects the active mode, and once locked, the mode cannot be changed without reprogramming the device in a controlled environment.
What is the purpose of the Error Correction State (ECS) latch in the 24CSM01T-E/MS?
The Error Correction State (ECS) latch in the 24CSM01T-E/MS is a read-only flag in the Configuration register that indicates whether ECC logic has corrected a single-bit error during a recent 4-byte read operation. It allows host firmware to log or respond to potential memory degradation events - enhancing system-level diagnostics and predictive maintenance capability for the 24CSM01T-E/MS.
24CSM01T-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
24CSM01T-E/MS FAQ
1.How can I place an order for 24CSM01T-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 24CSM01T-E/MS 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/MS reliable?
The price and inventory of 24CSM01T-E/MS 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/MS is usually 5 days.
3.What payment methods are accepted for 24CSM01T-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CSM01T-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24CSM01T-E/MS?
24CSM01T-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24CSM01T-E/MS 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/MS?
For technical support, including 24CSM01T-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CSM01T-E/MS requirements.
6.How does Aetrix verify that 24CSM01T-E/MS is sourced from the original manufacturer or authorized distributors?
All 24CSM01T-E/MS 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/MS meets industry standards.
7.What is the process for return or replacement of 24CSM01T-E/MS?
All 24CSM01T-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 24CSM01T-E/MS, 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/MS part is unused and in its original packaging.
Return procedure for 24CSM01T-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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