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Microchip Technology 24CSM01-E/MS
- Part No.:
- 24CSM01-E/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
24CSM01-E/MS.pdf
- Description:
- IC EEPROM 1MBIT I2C 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,733
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Product details
Overview
24CSM01-E/MS 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. It is used in automotive infotainment control modules for storing calibrated sensor offsets and secure boot configuration.
For engineers reviewing the 24CSM01-E/MS datasheet, 24CSM01-E/MS pinout, 24CSM01-E/MS application, or 24CSM01-E/MS equivalent, key selection considerations include its dual-zone write protection (hardware WP pin + software-configurable 128-Kbit zones), factory-programmed 128-bit unique serial number, and wettable flank VDFN-8 package optimized for automated optical inspection in automotive PCB assembly.
Technical Context
The 24CSM01-E/MS implements a two-wire I²C interface with Schmitt-trigger inputs and slope-controlled outputs to suppress ground bounce and noise. Its memory architecture comprises a 131,072 × 8-bit main array organized into 512 pages of 256 bytes each, plus a dedicated 4-Kbit security register containing a read-only 128-bit serial number followed by 256 bytes of user-lockable ID space.
Device operation is governed by a programmable Configuration register that enables either legacy hardware write protection or enhanced software-defined zone protection - configurable per eight independent 128-Kbit blocks. The built-in ECC logic corrects single-bit errors within any four-byte read window and latches error occurrence status via the Error Correction State (ECS) bit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 1 Mbit (131,072 × 8 bits), organized as 512 pages × 256 bytes - enables efficient firmware patch storage with page-aligned updates. |
| I²C Speed Support | Up to 3.4 MHz High-Speed mode (I-Temp.), plus 1 MHz / 400 kHz / 100 kHz - reduces configuration load time in real-time ECUs. |
| Write Endurance | 1,000,000 erase/write cycles - supports frequent calibration logging in ADAS sensors without wear-out risk. |
| Data Retention | >200 years at 55°C - ensures lifetime reliability for automotive black-box event logs. |
| Operating Voltage | 1.7V to 5.5V - compatible with both 1.8V microcontrollers and 5V legacy automotive subsystems. |
| ESD Protection | >4000V HBM - meets stringent automotive board-level ESD immunity requirements. |
| Temperature Range | -40°C to +125°C (Extended grade) - qualified for under-hood engine control unit deployment. |
| Security Features | Factory-programmed 128-bit unique serial number + 256-byte lockable ID page - eliminates external serialization hardware in Tier-1 manufacturing. |
Pinout & Package
24CSM01-E/MS is supplied in an 8-lead Wettable Flank VDFN package (3 mm × 2 mm, 0.5 mm pitch), designed for solder joint inspection via AOI. Exposed pad may be connected to VSS or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No-connect terminal | Internally unconnected; must remain floating - no routing or pull-up required. |
| A1, A2 | Hardware device address inputs | Set 2-bit client address for multi-drop I²C bus; hardwire to VSS/VCC to select one of four possible addresses (0x50–0x53). |
| VSS | Ground reference | Primary return path for all internal circuitry; connect directly to system ground plane. |
| SDA | Open-drain bidirectional data line | Requires external pull-up resistor (330 Ω for 3.4 MHz); supports ACK/NACK signaling and multi-master arbitration. |
| SCL | Open-drain clock input | Driven by host MCU only; slope control minimizes ground bounce during fast edge transitions. |
| WP | Hardware write-protect enable | Tie to VCC to disable all writes to main array and security register; ignored when Enhanced Software Write Protection is active. |
| VCC | Power supply input | Accepts 1.7–5.5V; internal POR circuit enforces 100 µs delay before first command acceptance after stable rail. |
Key Features
| Feature | Design Value |
|---|---|
| 128-bit factory serial number | Uniquely identifies each unit across CS-series EEPROMs - eliminates line-side serialization and enables traceability without host firmware overhead. |
| Enhanced software write protection | Configures eight independent 128-Kbit zones for granular protection - allows secure bootloader region locking while permitting runtime parameter updates elsewhere. |
| Built-in ECC logic | Corrects single-bit errors per 4-byte read window and sets ECS latch - prevents silent data corruption in safety-critical configuration storage. |
| I²C Manufacturer ID support | Returns unique 24-bit identifier on reserved host code access - enables automatic device enumeration and firmware version validation during system startup. |
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C operation with full temperature cycling and HTOL stress - certified for powertrain and chassis control applications. |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angle calibrations, and lighting profiles across vehicle lifecycle. IC Role / Device Role / Timing Role: Nonvolatile configuration store interfaced via I²C to body domain controller MCU; accessed during power-on initialization and runtime adjustment. Use Value: Factory-programmed 128-bit serial number enables VIN-linked personalization without external database; ECC ensures integrity of safety-relevant settings. | Use Scenario: Retaining I/O mapping tables, PID tuning parameters, and firmware update metadata across power cycles in modular automation controllers. IC Role / Device Role / Timing Role: Persistent parameter repository accessible over standard I²C at 1 MHz - coexists with other CS-series EEPROMs on shared bus using A1/A2 addressing. Use Value: Software-configurable zone protection isolates critical firmware vectors from field-serviceable parameter regions, reducing validation scope for firmware updates. |
| Medical Infusion Pump Calibration | Smart Energy Meter Security Log |
Use Scenario: Archiving flow sensor calibration coefficients, dose history, and maintenance timestamps in Class II medical devices. IC Role / Device Role / Timing Role: Tamper-resistant data vault with lockable 256-byte ID page - stores cryptographic keys and audit trail entries validated at boot. Use Value: Preprogrammed serial number binds calibration data to specific pump unit; >200-year retention satisfies FDA long-term recordkeeping mandates. | Use Scenario: Logging tamper events, firmware checksums, and metering interval data in ANSI C12.22-compliant smart meters deployed in harsh outdoor environments. IC Role / Device Role / Timing Role: Extended-temp EEPROM interfaced to metrology SoC; withstands thermal cycling while maintaining data integrity via ECC and >1M endurance. Use Value: Wettable flank VDFN-8 package ensures reliable solder joints under thermal stress; AEC-Q100 qualification validates robustness against grid-level EMI transients. |
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, same 8-lead MSOP package, 1.7–5.5V, but lacks security register and ECC. | Targeted at cost-sensitive consumer electronics where serialization and error correction are not required. | Select only if memory size and basic I²C compatibility suffice; cannot replace 24CSM01-E/MS in automotive or medical use cases requiring traceability or data integrity assurance. |
| BR24G1ME-3AE2 | 1-Mbit, 3.4 MHz I²C, 1.7–5.5V, includes 128-bit ID but no ECC or software-configurable zone protection. | Designed for industrial IoT gateways needing unique identification but not safety-critical error correction. | Use where serial number suffices and ECC is non-mandatory; does not support the same level of write-protection granularity or AEC-Q100 qualification. |
Compared with AT24CS128-MAHM-T and BR24G1ME-3AE2, the 24CSM01-E/MS uniquely combines automotive-grade reliability, on-die ECC, and software-definable memory protection - making it the only option among the three qualified for ASIL-B relevant configuration storage.
Availability
24CSM01-E/MS is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC firmware storage, and medical device calibration archiving requiring stable component supply across extended product lifecycles.
Supply support for 24CSM01-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, serving automotive, industrial, communications, and consumer markets with vertically integrated silicon and development tools.
The 24CSM01 belongs to Microchip's CS-series automotive EEPROM family, engineered specifically for high-reliability, secure nonvolatile storage in safety-critical systems where data integrity, traceability, and long-term retention are mandatory.
FAQ
What is the function of the NC pin on the 24CSM01-E/MS?
The NC (No Connect) pin on the 24CSM01-E/MS is internally unconnected and serves no electrical function. It must remain unconnected - neither tied to VCC nor VSS - and requires no PCB trace or decoupling. This pin is present for mechanical symmetry in the 8-lead VDFN package and has no impact on 24CSM01-E/MS operation or timing behavior.
Does the 24CSM01-E/MS support true drop-in replacement for legacy 24C series EEPROMs?
The 24CSM01-E/MS maintains I²C protocol compatibility with standard 24C devices but is not a pin-compatible drop-in replacement due to its expanded feature set and distinct memory map. While it accepts standard device address formats (0x50–0x53), the 24CSM01-E/MS introduces dedicated access modes for its security and configuration registers - requiring firmware updates to leverage its full capabilities. Legacy reads/writes to the main array remain functional.
How does the Error Correction State (ECS) latch in the 24CSM01-E/MS operate?
The ECS latch in the 24CSM01-E/MS is a read-only bit in the Configuration register that is automatically set to '1' whenever the internal ECC logic detects and corrects a single-bit error during a four-byte read operation. It remains asserted until cleared by a power cycle or hardware reset - enabling host firmware to log potential memory stress events. The 24CSM01-E/MS does not provide automatic ECC status polling; reading the Configuration register is required to monitor ECS state.
Can the 24CSM01-E/MS be used in systems operating below 1.7V?
No, the 24CSM01-E/MS is specified for operation only within 1.7V to 5.5V. Below 1.7V, internal voltage regulation and POR circuitry cannot guarantee reliable initialization or data retention. Attempting to operate the 24CSM01-E/MS at 1.6V or lower risks incomplete write cycles, corrupted reads, and undefined behavior - particularly during power-up sequences where VPOR threshold (≤1.5V) may be crossed without sufficient margin.
What happens when the WP pin is driven high while Enhanced Software Write Protection is enabled on the 24CSM01-E/MS?
When Enhanced Software Write Protection is active, the WP pin on the 24CSM01-E/MS is ignored - meaning driving it high has no effect on write permissions. Protection is instead enforced solely by the Configuration register's zone-lock bits. The WP pin retains functionality only in Legacy Mode; in Enhanced Mode, write access is determined exclusively by software configuration, allowing dynamic re-protection without hardware changes. This behavior is explicitly defined in Section 2.4 of the 24CSM01-E/MS datasheet.
24CSM01-E/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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:
- 400 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
24CSM01-E/MS FAQ
1.How can I place an order for 24CSM01-E/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 24CSM01-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 24CSM01-E/MS reliable?
The price and inventory of 24CSM01-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 24CSM01-E/MS is usually 5 days.
3.What payment methods are accepted for 24CSM01-E/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CSM01-E/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24CSM01-E/MS?
24CSM01-E/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24CSM01-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 24CSM01-E/MS?
For technical support, including 24CSM01-E/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CSM01-E/MS requirements.
6.How does Aetrix verify that 24CSM01-E/MS is sourced from the original manufacturer or authorized distributors?
All 24CSM01-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 24CSM01-E/MS meets industry standards.
7.What is the process for return or replacement of 24CSM01-E/MS?
All 24CSM01-E/MS units undergo pre-shipment inspection (PSI). If there is an issue with 24CSM01-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 24CSM01-E/MS part is unused and in its original packaging.
Return procedure for 24CSM01-E/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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