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Microchip Technology 24CSM01T-I/MS
- Part No.:
- 24CSM01T-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
24CSM01T-I/MS.pdf
- Description:
- IC EEPROM 1MBIT I2C 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,355
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Product details
Overview
24CSM01T-I/MS 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 a factory-programmed 128-bit serial number - used in automotive infotainment calibration storage, industrial sensor configuration, and secure device authentication.
For engineers reviewing the 24CSM01T-I/MS datasheet, 24CSM01T-I/MS pinout, 24CSM01T-I/MS application, or 24CSM01T-I/MS equivalent, key selection criteria include its AEC-Q100 qualification, software-configurable zone-level write protection, built-in Error Correction State latch, and compatibility with legacy and enhanced I²C bus timing across 100 kHz–3.4 MHz.
Technical Context
The 24CSM01T-I/MS implements a dual-register architecture: a 1-Mbit main memory array organized as 512 × 256-byte pages, and a separate 4-Kbit Security register containing a read-only 128-bit serial number plus 256 bytes of user-programmable, lockable ID space. Its Configuration register enables per-zone (eight 128-Kbit zones) software write protection, which can be permanently locked.
It uses hardware address pins A1/A2 for multi-device bus addressing (up to four devices), supports I²C Manufacturer ID command for system identification, and incorporates Schmitt-trigger inputs with slope control on SDA/SCL to suppress noise and eliminate ground bounce - critical for noisy automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 1 Mbit (131,072 × 8-bit), organized as 512 pages of 256 bytes - enables efficient firmware parameter storage with page-aligned updates. |
| I²C Speed Support | Up to 3.4 MHz (High-Speed mode), plus 1 MHz / 400 kHz / 100 kHz - allows real-time configuration loading in bandwidth-constrained embedded systems. |
| Write Cycle Time | ≤5 ms max self-timed byte/page write - eliminates need for external polling or timeout management in host firmware. |
| Operating Voltage | 1.7V to 5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters. |
| Data Retention | >200 years at 55°C - ensures long-term reliability for automotive ECUs and industrial controllers with 15+ year service life. |
| Endurance | 1,000,000 erase/write cycles - suitable for dynamic logging or runtime calibration tables updated daily over 27 years. |
| ECC Capability | Corrects up to 1 bit error per 4-byte read - prevents silent data corruption in safety-critical configuration storage. |
Pinout & Package
24CSM01T-I/MS is packaged in an 8-lead MSOP (3.0 × 4.9 mm, 0.65 mm pitch) with wettable flank capability for automated optical inspection. Pin 1 is NC; pins 2–3 are hardware address inputs A1/A2; pins 4 and 8 are VSS and VCC; pins 5–6 are bidirectional SDA and input SCL; pin 7 is active-high Write-Protect (WP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC (Pin 1) | No-connect | Unused terminal; must be left floating or tied to VSS per layout best practice - no internal connection. |
| A1 (Pin 2), A2 (Pin 3) | Hardware address inputs | Set two LSBs of 7-bit I²C client address; enable up to four 24CSM01T-I/MS devices on same bus without address conflict. |
| VSS (Pin 4) | Ground reference | Primary return path for all internal logic and I²C interface - requires low-impedance PCB plane connection. |
| SDA (Pin 5) | Bidirectional I²C data line | Open-drain output requiring external pull-up; supports clock stretching and ACK/NACK signaling per I²C spec. |
| SCL (Pin 6) | I²C clock input | Master-generated synchronous clock; Schmitt-trigger input ensures noise immunity in electrically harsh environments. |
| WP (Pin 7) | Hardware write-protect control | When pulled high, disables all writes to main memory and Security register - provides fail-safe protection during power-up or fault conditions. |
| VCC (Pin 8) | Power supply | Accepts 1.7–5.5V; internal voltage regulator enables stable operation across wide input range without external LDO. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Unique identifier preloaded at wafer test - eliminates manufacturing serialization overhead and enables secure device binding. |
| User-programmable, lockable 256-byte ID page | Allows OEM-specific keys or calibration data to be written once and permanently protected - prevents tampering in field-deployed units. |
| Configurable zone-level write protection | Eight independent 128-Kbit zones can be individually enabled/disabled via Configuration register - supports hierarchical access control for multi-function systems. |
| Built-in ECC with Error Correction State (ECS) latch | ECS flag in Configuration register indicates when single-bit correction occurred - enables host firmware to log memory integrity events for diagnostics. |
| I²C Manufacturer ID support | Returns unique 24-bit ID on request - simplifies automatic device enumeration and firmware version matching in multi-EEPROM systems. |
Applications
| Automotive Calibration Storage | Industrial Sensor Configuration |
|---|---|
Use Scenario: Storing engine ECU trim parameters, airbag deployment thresholds, and ADAS camera calibration offsets across vehicle lifetime. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed at boot and during reprogramming; retains data through 15+ year service life and 10,000+ thermal cycles. Use Value: AEC-Q100 qualification and >200-year data retention ensure compliance with ISO 26262 ASIL-B functional safety requirements for calibration persistence. | Use Scenario: Holding sensor linearization coefficients, temperature compensation tables, and device-specific calibration constants in programmable logic controllers. IC Role / Device Role / Timing Role: Secure parameter repository with lockable ID page - stores factory-calibrated values that must survive field firmware updates. Use Value: Hardware WP pin + software zone protection prevent accidental overwrite during maintenance, while ECC guarantees integrity of critical measurement data. |
| Secure IoT Device Identity | Medical Equipment Settings Backup |
Use Scenario: Binding cryptographic keys and device certificates to hardware identity in edge gateways and smart meters. IC Role / Device Role / Timing Role: Root-of-trust anchor storing immutable 128-bit serial number and provisioned keys - accessed only by secure bootloader during attestation. Use Value: Preprogrammed serial number eliminates post-silicon provisioning cost; lockable ID page enables one-time key injection with irreversible protection. | Use Scenario: Preserving user-adjusted therapy parameters, alarm thresholds, and calibration history in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Fail-safe settings backup that survives power loss and reset - read at startup and validated via ECC before enabling treatment delivery. Use Value: 1,000,000 write cycles and 5 µA standby current (E-temp) support battery-powered operation for >5 years without data loss. |
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; no Security register or ECC; supports only up to 1 MHz I²C; lacks AEC-Q100 qualification. | Suitable for cost-sensitive consumer electronics where security and automotive reliability are not required. | Select only if memory size, ECC, and automotive qualification are unnecessary - not drop-in compatible due to smaller density and missing registers. |
| BR24G128FJ-WE2 | 128-Kbit; includes ECC but no serial number or lockable ID page; supports 3.4 MHz I²C; AEC-Q100 qualified (Grade 2). | Fits automotive applications needing basic ECC but not device identity or secure provisioning. | Choose when ECC and AEC-Q100 are mandatory but 1-Mbit density and factory serial number are not - different pinout (8-pin SOP vs. MSOP) requires layout change. |
Compared with AT24CS128-MAHM-T and BR24G128FJ-WE2, the 24CSM01T-I/MS uniquely combines 1-Mbit density, AEC-Q100 Grade 1 qualification, factory-serialized identity, and configurable zone protection - making it the only option for safety-critical automotive and industrial systems requiring both scalability and cryptographic binding.
Availability
24CSM01T-I/MS is available at Aetrix Electronics and suitable for automotive ECU calibration storage, industrial sensor configuration, and secure IoT device identity applications requiring stable component supply, long-lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for 24CSM01T-I/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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and nonvolatile memory solutions for automotive, industrial, and communications markets.
The 24CSM01T-I/MS belongs to Microchip's CS-series Serial EEPROM family, designed specifically for automotive-grade, secure, and high-reliability configuration storage - emphasizing ECC resilience, factory serialization, and flexible write protection for safety-critical systems.
FAQ
What is the operating temperature range for the 24CSM01T-I/MS?
The 24CSM01T-I/MS is rated for the Industrial temperature range of –40°C to +85°C, as indicated by the "I" suffix in its part number. It meets AEC-Q100 Grade 1 requirements, ensuring reliable operation in under-hood automotive environments and industrial control cabinets without derating.
Does the 24CSM01T-I/MS support true 3.4 MHz I²C High-Speed mode?
Yes, the 24CSM01T-I/MS fully supports I²C High-Speed mode at 3.4 MHz when VCC is ≥2.5V and ambient temperature is within the Industrial range. AC timing parameters including THIGH (60 ns min), TLOW (160 ns min), and TAA (70 ns max) are guaranteed per DS20006781D.
How is the 128-bit serial number accessed in the 24CSM01T-I/MS?
The 128-bit serial number resides in the Security register at addresses 0800h–080Fh and is read-only. Access requires sending a valid device address byte with bits [7:4] = 1011, followed by word address bytes specifying A15=0 and A11–A10=10b - as defined in Table 3-3 of the 24CSM01T-I/MS datasheet.
Can the Configuration register of the 24CSM01T-I/MS be unlocked after being locked?
No, the Configuration register of the 24CSM01T-I/MS can be permanently locked via a software sequence, after which it becomes read-only. Once locked, no command or voltage sequence can restore write access - this ensures irreversible protection of write-protection settings in deployed systems.
What is the function of the NC pin on the 24CSM01T-I/MS MSOP package?
The NC (No Connect) pin on the 24CSM01T-I/MS MSOP package (Pin 1) has no internal connection and serves no electrical function. It may be left floating or tied to VSS per PCB layout guidelines, but must never be driven or used for signal routing - doing so risks violating the device's absolute maximum ratings.
24CSM01T-I/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:
- 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-MSOP
24CSM01T-I/MS FAQ
1.How can I place an order for 24CSM01T-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 24CSM01T-I/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-I/MS reliable?
The price and inventory of 24CSM01T-I/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-I/MS is usually 5 days.
3.What payment methods are accepted for 24CSM01T-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CSM01T-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24CSM01T-I/MS?
24CSM01T-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24CSM01T-I/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-I/MS?
For technical support, including 24CSM01T-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CSM01T-I/MS requirements.
6.How does Aetrix verify that 24CSM01T-I/MS is sourced from the original manufacturer or authorized distributors?
All 24CSM01T-I/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-I/MS meets industry standards.
7.What is the process for return or replacement of 24CSM01T-I/MS?
All 24CSM01T-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 24CSM01T-I/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-I/MS part is unused and in its original packaging.
Return procedure for 24CSM01T-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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