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Microchip Technology 24CSM01T-E/ST
- Part No.:
- 24CSM01T-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
24CSM01T-E/ST.pdf
- Description:
- IC EEPROM 1MBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,139
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Product details
Overview
24CSM01T-E/ST from Microchip Technology is a 1-Mbit I²C serial EEPROM with high-speed 3.4 MHz operation, built-in 128-bit factory-unique serial number, and dual write protection (hardware WP pin + software-configurable zone locking). It operates from 1.7V to 5.5V, supports -40°C to +125°C extended temperature range, and is AEC-Q100 qualified for automotive infotainment and body control modules.
For engineers reviewing the 24CSM01T-E/ST datasheet, 24CSM01T-E/ST pinout, 24CSM01T-E/ST application, or 24CSM01T-E/ST equivalent, key selection criteria include its 256-byte page-write capability, ECC-corrected reads, Security register lockability, and compatibility with legacy and enhanced I²C bus timing across 100 kHz–3.4 MHz.
Technical Context
The 24CSM01T-E/ST implements a two-wire I²C interface with hardware-level Schmitt-trigger inputs and slope-controlled outputs to suppress ground bounce and noise. Its memory is organized as 512 pages × 256 bytes, enabling efficient bulk writes without address wraparound within a page boundary.
It integrates three dedicated register spaces: a 1-Mbit main array, a 4-Kbit Security register (128-bit read-only serial number + 256-byte user-programmable ID page), and a Configuration register that enables per-zone software write protection - 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 - enables single-cycle 256-byte writes within same page. |
| I²C speed modes | Up to 3.4 MHz High-Speed mode (I-Temp.), plus 1 MHz / 400 kHz / 100 kHz - supports mixed-speed bus systems with backward compatibility. |
| Write cycle time | ≤5 ms max self-timed byte/page write - eliminates need for external polling or timeout logic in host firmware. |
| Operating voltage | 1.7V to 5.5V - interoperable with 1.8V, 2.5V, 3.3V, and 5V microcontrollers without level shifters. |
| Data retention | >200 years at 55°C - validated for long-life automotive and industrial deployments requiring zero field failures over product lifetime. |
| Endurance | 1,000,000 erase/write cycles - specified for 4-byte-aligned writes, ensuring predictable wear leveling in firmware update storage. |
| ECC capability | Corrects up to 1 bit error per 4-byte read - reduces uncorrectable read failures in electrically noisy environments (e.g., motor drive subsystems). |
Pinout & Package
24CSM01T-E/ST is packaged in an 8-lead SOIJ (Small Outline J-bend) with wettable flank leads for automated optical inspection (AOI) and solder joint reliability in automotive reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No-connect | Pin 1 is internally unconnected - must be left floating or tied to VSS per layout best practice; no electrical function. |
| A1, A2 | Hardware address inputs | Set 2-bit portion of 7-bit I²C client address - allows up to four 24CSM01T-E/ST devices on same bus without address conflict. |
| VSS | Ground reference | Primary return path for all internal circuitry and I/O - requires low-impedance connection to system ground plane. |
| SDA | Serial data bidirectional line | Open-drain I²C data line - requires external pull-up resistor (330Ω for 3.4 MHz); supports ACK/NACK signaling per I²C spec. |
| SCL | Serial clock input | Master-generated clock - synchronizes all data transfers; includes Schmitt trigger for noise immunity on rising/falling edges. |
| WP | Write-protect control | Hardware lock: tie to VCC to disable all writes to main array and Security register; overridden only when Enhanced Software Protection is enabled. |
| VCC | Power supply | Single-supply input (1.7–5.5V) - powers EEPROM core, I/O buffers, and internal HV generation for write operations. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Uniquely identifies each unit across CS-series EEPROMs - eliminates manufacturing serialization overhead and enables secure device binding. |
| User-programmable 256-byte ID page | Lockable via software sequence - stores calibration data, MAC addresses, or firmware signatures with irreversible write protection. |
| Configurable write protection zones | Eight independent 128-Kbit zones - each individually lockable via Configuration register, enabling granular firmware partitioning (e.g., bootloader vs. app image). |
| Integrated ECC logic with ECS latch | Detects and corrects single-bit errors per 4-byte read; Error Correction State flag indicates correction event - enables failure logging without host intervention. |
| I²C Manufacturer ID support | Returns unique 24-bit value on reserved host code - allows runtime identification of 24CSM01T-E/ST among mixed EEPROM families on shared bus. |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in vehicle door modules. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with AEC-Q100 qualification and >200-year data retention - survives 15+ year vehicle service life. Use Value: Eliminates need for external serialization or backup battery; 128-bit serial number enables anti-counterfeit pairing with head unit. | Use Scenario: Retaining I/O mapping, PID tuning constants, and safety interlock settings across power cycles in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: High-reliability configuration memory with ECC and 1M write cycles - ensures deterministic behavior after 10+ years of daily firmware updates. Use Value: Software-configurable zone protection prevents accidental overwrite of safety-critical parameters during field maintenance. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Vault |
Use Scenario: Securing flow rate calibration coefficients and usage logs in Class II medical devices subject to IEC 62304. IC Role / Device Role / Timing Role: Tamper-resistant storage with lockable 256-byte ID page - meets traceability requirements for FDA audit trails. Use Value: Factory-programmed serial number binds calibration data to specific pump unit, preventing cross-device parameter injection. | Use Scenario: Storing metrology firmware patches, tariff tables, and cryptographic keys in ANSI C12.22-compliant meters. IC Role / Device Role / Timing Role: Secure, high-endurance memory with ECC and 3.4 MHz I²C - enables fast OTA updates without compromising meter uptime. Use Value: Enhanced software write protection isolates crypto key storage from application firmware partitions, mitigating remote exploit vectors. |
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 MHz max I²C speed, no built-in ECC or serial number | Lacks security features and automotive qualification - suitable only for cost-sensitive consumer electronics | Select only if memory size ≤128 Kbit suffices and AEC-Q100/ECC/serialization are not required. |
| BR24G128FJ-WE2 | 128-Kbit, supports 1 MHz I²C, includes 64-byte ID area but no factory serial number or ECC | RoHS-compliant but not AEC-Q100 qualified - limited to industrial temperature range (-40°C to +85°C) | Choose when footprint compatibility with Fujitsu-compatible SOIJ-8 is critical and extended temp/AEC-Q100 are unnecessary. |
Compared with AT24CS128-SSHL-T and BR24G128FJ-WE2, the 24CSM01T-E/ST delivers 8× more memory, 3.4× higher I²C bandwidth, integrated ECC, factory-unique serialization, and full AEC-Q100 compliance - making it the only option for automotive-grade, secure, high-capacity configuration storage.
Availability
24CSM01T-E/ST is available at Aetrix Electronics and suitable for automotive body control, industrial PLC configuration, medical device calibration, smart energy metering, and industrial sensor node applications requiring stable component supply across extended temperature and long lifecycle requirements.
Supply support for 24CSM01T-E/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 microcontroller, analog, FPGA, and memory solutions, serving automotive, industrial, communications, and consumer markets with vertically integrated silicon and development tools.
The 24CSM01T-E/ST belongs to Microchip's CS-series Serial EEPROM family, engineered specifically for automotive and high-reliability industrial applications demanding secure, long-life, and AEC-Q100-qualified nonvolatile memory with advanced data integrity features.
FAQ
What is the maximum I²C clock frequency supported by the 24CSM01T-E/ST?
The 24CSM01T-E/ST supports up to 3.4 MHz in High-Speed mode when operating at VCC ≥2.5V and within the Industrial temperature range (-40°C to +85°C). At lower voltages (1.7V–2.5V) or Extended temperature range (-40°C to +125°C), the maximum clock frequency is 1 MHz. This dual-speed capability allows seamless integration into mixed-voltage systems while maintaining backward compatibility with standard I²C peripherals.
Does the 24CSM01T-E/ST include error correction, and how does it work?
Yes, the 24CSM01T-E/ST incorporates built-in Error Correction Code (ECC) logic that corrects up to one bit error per 4-byte read operation. When ECC correction occurs, the Error Correction State (ECS) latch in the Configuration register is set and remains asserted until cleared by host software. This enables real-time detection of memory degradation without requiring external error-handling firmware, directly enhancing system reliability in electrically noisy environments where the 24CSM01T-E/ST is deployed.
How is the 128-bit serial number used in the 24CSM01T-E/ST?
The 128-bit serial number in the 24CSM01T-E/ST is factory-programmed, globally unique across all CS-series EEPROMs, and stored in the first 16 bytes of the Security register (addresses 0800h–080Fh). It is read-only and cannot be altered. This serial number eliminates the need for external serialization during manufacturing and enables secure device binding, anti-counterfeiting, and traceability in automotive and medical applications where the 24CSM01T-E/ST is used.
Can the 24CSM01T-E/ST be used in automotive applications, and what qualifications does it meet?
Yes, the 24CSM01T-E/ST is AEC-Q100 qualified for automotive applications and rated for the Extended temperature range (-40°C to +125°C). It meets stringent automotive reliability requirements including >200 years of data retention at 55°C, 1,000,000 write cycles, and >4 kV ESD protection. These specifications make the 24CSM01T-E/ST suitable for use in body control modules, infotainment systems, and ADAS-related subsystems where the 24CSM01T-E/ST provides certified nonvolatile storage.
What write protection options are available on the 24CSM01T-E/ST?
The 24CSM01T-E/ST offers dual write protection: (1) Hardware-based via the WP pin - tying WP to VCC disables all writes to both main memory and Security register; (2) Software-configurable via the Configuration register - enabling independent lock/unlock of eight 128-Kbit zones. Once locked, zones remain protected even if WP is later grounded. This layered approach ensures robust data integrity in safety-critical applications where the 24CSM01T-E/ST is deployed.
24CSM01T-E/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:
- 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-TSSOP
24CSM01T-E/ST FAQ
1.How can I place an order for 24CSM01T-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 24CSM01T-E/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-E/ST reliable?
The price and inventory of 24CSM01T-E/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-E/ST is usually 5 days.
3.What payment methods are accepted for 24CSM01T-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CSM01T-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24CSM01T-E/ST?
24CSM01T-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24CSM01T-E/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-E/ST?
For technical support, including 24CSM01T-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CSM01T-E/ST requirements.
6.How does Aetrix verify that 24CSM01T-E/ST is sourced from the original manufacturer or authorized distributors?
All 24CSM01T-E/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-E/ST meets industry standards.
7.What is the process for return or replacement of 24CSM01T-E/ST?
All 24CSM01T-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 24CSM01T-E/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-E/ST part is unused and in its original packaging.
Return procedure for 24CSM01T-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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