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Microchip Technology 24CSM01-E/SM
- Part No.:
- 24CSM01-E/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
24CSM01-E/SM.pdf
- Description:
- IC EEPROM 1MBIT I2C 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:3,870
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Product details
Overview
24CSM01-E/SM from Microchip Technology is a 1-Mbit I²C serial EEPROM with integrated security register, ECC logic, 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. Used for secure configuration storage in automotive ECUs and industrial controllers.
For engineers reviewing the 24CSM01-E/SM datasheet, 24CSM01-E/SM pinout, 24CSM01-E/SM application, or 24CSM01-E/SM equivalent, key selection criteria include its factory-programmed 128-bit serial number, software-lockable 256-byte ID page, hardware WP pin, dual-zone write protection (legacy + enhanced), and wettable flank VDFN-8 package for automated optical inspection.
Technical Context
The 24CSM01-E/SM implements a two-wire I²C interface with Schmitt-trigger inputs, slope-controlled outputs, and configurable clock timing (100 kHz–3.4 MHz). 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 programmable Configuration register enabling either hardware-based full-array write protection or enhanced software-defined zone protection across eight independent 128-Kbit regions. Built-in ECC corrects single-bit errors per 4-byte read and latches error state via ECS bit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (131,072 × 8), organized as 512 pages of 256 bytes - enables efficient bulk writes without crossing page boundaries. |
| I²C Speed | Up to 3.4 MHz High-Speed mode - reduces firmware boot-time latency for large configuration loads. |
| Write Cycle Time | ≤5 ms max per byte or page - ensures deterministic nonvolatile update timing for safety-critical systems. |
| 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 - guarantees long-term calibration and cryptographic key persistence in automotive life cycles. |
| Endurance | 1,000,000 write cycles - sustains frequent firmware parameter updates in industrial HMI or sensor calibration loops. |
| Temperature Range | -40°C to +125°C (Extended grade) - qualified for under-hood automotive and high-temp industrial environments. |
| ESD Protection | >4000V HBM - withstands handling and board-level ESD events in manufacturing and field service. |
Pinout & Package
24CSM01-E/SM is packaged in an 8-lead Wettable Flank VDFN (1.6 mm × 2.1 mm, 0.5 mm pitch) with exposed thermal pad. This package supports automated optical inspection (AOI) and improves solder joint reliability in automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No Connect | Unbonded die pad - must remain floating or grounded per layout guidelines; no electrical function. |
| A1, A2 | Hardware Address Inputs | Set 2-bit portion of 7-bit I²C address - allows up to four 24CSM01-E/SM devices on same bus without address conflict. |
| VSS | Ground Reference | Primary return path for all internal circuits and I/O - requires low-impedance connection to system ground plane. |
| SDA | Serial Data Line | Open-drain bidirectional I²C data bus - requires external pull-up resistor (330 Ω for 3.4 MHz operation). |
| SCL | Serial Clock Input | Input-only I²C clock line - controls timing of data sampling and ACK/NACK generation. |
| WP | Write-Protect Control | Active-high hardware lock - when tied to VCC, disables all writes to main array and security register (unless enhanced mode is active). |
| VCC | Power Supply | Core supply input (1.7–5.5V) - must be decoupled with ≥100 nF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed 128-Bit Serial Number | Globally unique identifier preloaded at wafer test - eliminates need for post-manufacturing serialization in Tier 1 automotive production lines. |
| User-Programmable Lockable ID Page | 256-byte EEPROM section permanently secured via software command - stores immutable device-specific keys or calibration data. |
| Configurable Write Protection | Switch between hardware WP-pin control and software-defined 8-zone protection - enables flexible security policies across product variants. |
| Built-In ECC Logic | Corrects single-bit errors per 4-byte read and flags correction via ECS latch - prevents silent data corruption in safety-critical configuration registers. |
| AEC-Q100 Qualified | Grade 1 (-40°C to +125°C) qualification with stress testing per automotive reliability standards - meets ISO/TS 16949 requirements for ECU components. |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror calibration offsets, and lighting profiles in vehicle body control units. IC Role / Device Role / Timing Role: Nonvolatile configuration memory with tamper-resistant serial ID and ECC-protected parameter tables. Use Value: Enables zero-latency recall of user preferences after ignition cycle, with cryptographic traceability via factory-unique serial number. | Use Scenario: Retaining I/O mapping, PID tuning parameters, and firmware revision history across power cycles in modular PLC backplanes. IC Role / Device Role / Timing Role: Secure, high-endurance EEPROM for runtime-configurable control logic with write-cycle optimization. Use Value: Supports >1M reconfiguration events over 15+ years of operation while maintaining data integrity under voltage brownouts. |
| Medical Infusion Pump Calibration | Smart Energy Meter Security Key Storage |
Use Scenario: Archiving flow-rate calibration coefficients, sensor offset corrections, and audit logs in Class II medical devices. IC Role / Device Role / Timing Role: AEC-Q100-qualified EEPROM with >200-year data retention and lockable ID page for regulatory compliance records. Use Value: Meets FDA 21 CFR Part 11 requirements for immutable device history and cryptographic binding of calibration data. | Use Scenario: Storing AES-128 keys, meter serial ID, and firmware signature hashes in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Hardware-enforced secure storage with preprogrammed 128-bit serial number and ECC-protected key blocks. Use Value: Prevents unauthorized key extraction by combining physical write-protection (WP pin) and software-locked ID page. |
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, no ECC, only 1 MHz I²C max, SOIC-8 package | Lacks 128-bit serial number, ID page, and zone-based write protection - insufficient for automotive traceability or secure key storage | Select only for cost-sensitive consumer applications where security and endurance are secondary |
| BR24G128FJ-3GE2 | 128-Kbit, built-in ECC, 1.7–5.5V, but no factory serial number or lockable ID page; TSSOP-8 package | Supports ECC and wide voltage range but cannot replace 24CSM01-E/SM's unique serialization or irreversible ID locking | Use where basic error correction is required but device identity management is handled externally |
Compared with AT24CS128-MAHM-T and BR24G128FJ-3GE2, the 24CSM01-E/SM uniquely combines automotive-grade reliability, factory-serialized identity, and software-lockable secure storage - making it irreplaceable for AEC-Q100 systems requiring end-to-end configuration provenance.
Availability
24CSM01-E/SM is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 24CSM01-E/SM 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 memory solutions for automotive, industrial, and communications markets.
The 24CSM01-E/SM belongs to Microchip's CS-series automotive EEPROM family, designed specifically to meet AEC-Q100 Grade 1 requirements while integrating hardware-assisted security features for functional safety and device identity management.
FAQ
What is the primary memory organization of the 24CSM01-E/SM?
The 24CSM01-E/SM contains 1 Mbit (131,072 × 8) of EEPROM, internally organized as 512 pages of 256 bytes each. This structure enables efficient page-write operations without crossing boundaries. The device also includes a separate 4-Kbit Security register with a factory-programmed 128-bit serial number and a user-programmable 256-byte ID page. All memory is accessible via standard I²C protocol with support for High-Speed mode up to 3.4 MHz.
Does the 24CSM01-E/SM support both hardware and software write protection?
Yes, the 24CSM01-E/SM supports dual write protection modes. Hardware protection uses the dedicated WP pin to disable all writes when pulled high. Software protection is enabled via the Configuration register, allowing independent locking of eight 128-Kbit zones. Once configured, the register can be permanently locked. Both modes coexist, and the WP pin is ignored in enhanced software mode - ensuring flexibility for legacy and secure designs alike.
What is the purpose and behavior of the 128-bit serial number in the 24CSM01-E/SM?
The 24CSM01-E/SM features a factory-programmed, globally unique 128-bit serial number stored in the first 16 bytes of its Security register. It is read-only and guaranteed unique across the entire CS-series EEPROM family. This eliminates the need for post-production serialization in automotive and industrial manufacturing. The serial number is accessed via dedicated I²C commands and remains intact even after repeated erase/write cycles or power cycling.
How does the built-in ECC logic function in the 24CSM01-E/SM?
The 24CSM01-E/SM implements on-die ECC that detects and corrects single-bit errors within any 4-byte read window. When correction occurs, the Error Correction State (ECS) latch in the Configuration register is set and remains asserted until cleared by software. This provides real-time feedback on memory integrity without requiring host-side error-handling overhead - critical for functional safety applications where silent data corruption must be flagged and logged.
Is the 24CSM01-E/SM compatible with standard I²C protocols and timing?
Yes, the 24CSM01-E/SM fully complies with standard I²C specifications across all supported speeds: 100 kHz (Standard), 400 kHz (Fast), 1 MHz (Fast Plus), and 3.4 MHz (High-Speed mode). It includes Schmitt-trigger inputs, slew-rate controlled outputs, and configurable timing parameters. The device responds to standard START/STOP conditions, ACK/NACK handshaking, and 7-bit addressing - ensuring drop-in compatibility with existing I²C masters without firmware modification.
24CSM01-E/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm 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-SOIJ
24CSM01-E/SM FAQ
1.How can I place an order for 24CSM01-E/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 24CSM01-E/SM 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/SM reliable?
The price and inventory of 24CSM01-E/SM 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/SM is usually 5 days.
3.What payment methods are accepted for 24CSM01-E/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CSM01-E/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24CSM01-E/SM?
24CSM01-E/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24CSM01-E/SM 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/SM?
For technical support, including 24CSM01-E/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CSM01-E/SM requirements.
6.How does Aetrix verify that 24CSM01-E/SM is sourced from the original manufacturer or authorized distributors?
All 24CSM01-E/SM 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/SM meets industry standards.
7.What is the process for return or replacement of 24CSM01-E/SM?
All 24CSM01-E/SM units undergo pre-shipment inspection (PSI). If there is an issue with 24CSM01-E/SM, 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/SM part is unused and in its original packaging.
Return procedure for 24CSM01-E/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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