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Microchip Technology 24CSM01T-I/SM
- Part No.:
- 24CSM01T-I/SM
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
24CSM01T-I/SM.pdf
- Description:
- IC EEPROM 1MBIT I2C 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:2,085
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Product details
Overview
24CSM01T-I/SM from Microchip Technology is a 1-Mbit I²C serial EEPROM with integrated security register, ECC logic, and high-speed 3.4 MHz interface. It features a factory-programmed 128-bit unique serial number, user-lockable 256-byte ID page, hardware/software write protection, and operates from 1.7V to 5.5V across –40°C to +85°C. Used in automotive infotainment configuration storage and industrial sensor calibration data retention.
For engineers reviewing the 24CSM01T-I/SM datasheet, 24CSM01T-I/SM pinout, 24CSM01T-I/SM application, or 24CSM01T-I/SM equivalent, key selection criteria include its AEC-Q100 qualification, built-in ECC for bit-error correction, dual-zone write protection (hardware WP pin + software-configurable 128-Kbit zones), 1 µA standby current at 5.5V, and support for I²C Manufacturer ID identification.
Technical Context
The 24CSM01T-I/SM implements a two-wire I²C interface with full High-Speed mode (3.4 MHz) compliance, Schmitt-trigger inputs for noise immunity, and slope-controlled outputs to suppress ground bounce. Its memory is organized as 512 pages × 256 bytes (131,072 × 8 bits), with separate 4-Kbit security register space containing read-only serial number and lockable user ID page.
It includes a programmable Configuration register enabling enhanced software write protection per eight independent 128-Kbit zones, which can be permanently locked. Built-in ECC corrects single-bit errors within any four-byte read window and provides an Error Correction State (ECS) latch via the Configuration register for system-level error monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (131,072 × 8 bits), 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), plus 1 MHz / 400 kHz / 100 kHz - supports fast firmware updates and real-time parameter logging. |
| Write Cycle Time | ≤5 ms max self-timed byte/page write - ensures predictable timing for host firmware timeout handling. |
| Operating Voltage | 1.7V to 5.5V - compatible with both low-voltage microcontrollers and legacy 5V systems without level shifting. |
| Endurance & Retention | 1,000,000 write cycles; >200 years data retention at 55°C - suitable for mission-critical calibration and serial number storage. |
| Security Features | Factory-programmed 128-bit unique serial number + 256-byte user-programmable/lockable ID page - eliminates line-side serialization and secures device identity. |
| Protection Modes | Hardware WP pin (full-array) + software-configurable per-zone protection via Configuration register - flexible, layered data integrity control. |
Pinout & Package
24CSM01T-I/SM is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with wettable flank terminations for automated optical inspection (AOI) and improved solder joint reliability. Pin 1 is NC (No Connect); pins A1 and A2 set hardware I²C address; VSS and VCC provide power; SDA and SCL form the bidirectional I²C bus; WP enables hardware write protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No Connect | Unused pin; must remain unconnected - no internal function or electrical loading. |
| A1, A2 | Hardware Address Inputs | Set two LSBs of 7-bit I²C client address; hardwire to VSS/VCC to support up to four devices on same bus. |
| VSS | Ground Reference | Primary return path for all internal circuitry and I/O; requires low-impedance connection to system ground plane. |
| SDA | Serial Data Line | Bidirectional open-drain I²C data line; requires external pull-up resistor (330Ω for 3.4 MHz). |
| SCL | Serial Clock Input | Input-only I²C clock line; synchronized with SDA transitions; slope-controlled to reduce EMI. |
| WP | Write-Protect Control | Active-high hardware lock: tied to VCC disables all writes to memory and security register; tied to VSS enables writes. |
| VCC | Power Supply | 1.7V–5.5V supply input; decoupling capacitor (0.1 µF) required near pin for stable operation during write cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Security Register | Contains factory-programmed 128-bit globally unique serial number + 256-byte user-programmable/lockable ID page - enables secure device authentication and tamper-proof identity binding. |
| Built-in ECC Logic | Corrects single-bit errors in any four-byte read window and latches error occurrence via ECS bit - improves long-term data integrity in harsh environments. |
| Enhanced Software Write Protection | Configurable per-zone (eight 128-Kbit blocks) protection via lockable Configuration register - allows selective locking of calibration data while leaving firmware update areas writable. |
| I²C Manufacturer ID Support | Returns unique 24-bit identifier on request - simplifies multi-device enumeration and firmware validation in complex I²C topologies. |
| AEC-Q100 Qualified | Qualified for automotive applications (Grade 2: –40°C to +105°C ambient, extended temp option available) - meets stress testing requirements for under-hood and infotainment use. |
Applications
| Automotive Infotainment Configuration | Industrial Sensor Calibration Storage |
|---|---|
Use Scenario: Storing display settings, audio profiles, and user preferences in head units and digital instrument clusters. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via I²C during boot and runtime; retains data across ignition cycles. Use Value: Factory-programmed 128-bit serial number enables secure pairing with cloud services; ECC prevents silent corruption of critical UI state. | Use Scenario: Holding temperature, offset, and gain coefficients for pressure and humidity sensors in factory-calibrated modules. IC Role / Device Role / Timing Role: Calibration data repository written once during production and read repeatedly during operation; protected by hardware WP pin. Use Value: >200-year data retention ensures lifetime accuracy; software-configurable zone protection isolates calibration data from firmware update regions. |
| Medical Device Serial Numbering | Smart Energy Meter Firmware Parameters |
Use Scenario: Assigning unique traceable identifiers to Class II medical devices for regulatory compliance and field service tracking. IC Role / Device Role / Timing Role: Secure identity anchor storing immutable serial number and manufacturing date; accessed only during device commissioning. Use Value: Globally unique 128-bit serial number eliminates serialization overhead on production lines; lockable ID page prevents post-manufacture reprogramming. | Use Scenario: Storing tariff tables, metering constants, and communication keys in utility-grade smart meters deployed in outdoor enclosures. IC Role / Device Role / Timing Role: Long-life parameter storage operating across wide temperature range (–40°C to +85°C) and subject to frequent power cycling. Use Value: 1 µA standby current minimizes battery drain in backup-powered meters; AEC-Q100 qualification ensures reliability in thermally stressed environments. |
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; no security register or ECC; 1 MHz max I²C speed; same SOIC-8 package. | Lacks 128-bit serial number, ECC, and enhanced software protection - insufficient for automotive or secure identity use cases. | Select only for cost-sensitive, non-automotive applications requiring basic EEPROM functionality without security or high-speed operation. |
| BR24G128FJ-3GE2 | 128-Kbit; built-in ECC; 1 MHz I²C; 1.7–5.5V; SOIJ-8 package; no security register or serial number. | Provides ECC but omits factory-programmed serial number and lockable ID page - cannot replace 24CSM01T-I/SM in secure device identity applications. | Choose when ECC is mandatory but serial number uniqueness and programmable ID storage are not required. |
Compared with AT24CS128-SSHL-T and BR24G128FJ-3GE2, the 24CSM01T-I/SM delivers uniquely integrated security (128-bit serial number + lockable ID page), higher 3.4 MHz I²C bandwidth, and per-zone software write protection - making it the only qualified option for AEC-Q100-compliant automotive and secure industrial identity storage.
Availability
24CSM01T-I/SM is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor calibration modules, and medical device serialization requiring stable component supply across extended product lifecycles.
Supply support for 24CSM01T-I/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 leading provider of microcontroller, analog, FPGA, and memory solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.
The 24CSM01T-I/SM belongs to Microchip's CS-series serial EEPROM family, designed specifically for automotive-grade, secure, and high-reliability nonvolatile storage where data integrity, traceability, and long-term retention are critical.
FAQ
What is the maximum I²C clock frequency supported by the 24CSM01T-I/SM?
The 24CSM01T-I/SM supports up to 3.4 MHz in High-Speed mode when VCC ≥2.5V and operating in Industrial temperature range (–40°C to +85°C). At lower voltages (1.7V–2.5V) or Extended temperature range, maximum clock frequency is 1 MHz. This enables faster parameter updates compared to standard 400 kHz EEPROMs while maintaining compatibility with legacy I²C controllers.
Does the 24CSM01T-I/SM require external pull-up resistors on SDA and SCL lines?
Yes, the 24CSM01T-I/SM requires external pull-up resistors on both SDA and SCL lines because it uses open-drain I²C signaling. Recommended values are 330Ω for 3.4 MHz operation, 2 kΩ for 1 MHz/400 kHz, and 10 kΩ for 100 kHz - selected based on bus capacitance and desired rise time. The 24CSM01T-I/SM itself does not integrate pull-ups.
How is the 128-bit serial number in the 24CSM01T-I/SM used and accessed?
The 128-bit serial number in the 24CSM01T-I/SM is factory-programmed, globally unique, and stored in the first 16 bytes of the read-only portion of the Security register (address 0800h–080Fh). It is accessed by sending a valid device address byte with bits 7–4 = 1011 (Security register access), followed by word address bytes specifying A15=0 and A11–A10=10b. No write capability exists for this field.
Can the 24CSM01T-I/SM be used in automotive applications?
Yes, the 24CSM01T-I/SM is AEC-Q100 qualified (Grade 2) and rated for –40°C to +105°C ambient operation, making it suitable for automotive infotainment, body control modules, and ADAS subsystems. Its built-in ECC, >200-year data retention, and hardware/software write protection meet stringent automotive reliability and functional safety requirements.
What happens if the WP pin is left floating on the 24CSM01T-I/SM?
The WP pin on the 24CSM01T-I/SM must be actively driven to either VCC or VSS - it is not internally biased and will not default to a defined logic level. If left floating, write protection behavior is undefined and may result in intermittent or unintended write inhibition. For guaranteed full-array protection, tie WP to VCC; for full write enable, tie to VSS.
24CSM01T-I/SM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm 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-SOIJ
24CSM01T-I/SM FAQ
1.How can I place an order for 24CSM01T-I/SM through Aetrix?
Please submit a Request for Quotation (RFQ) for 24CSM01T-I/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 24CSM01T-I/SM reliable?
The price and inventory of 24CSM01T-I/SM 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/SM is usually 5 days.
3.What payment methods are accepted for 24CSM01T-I/SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CSM01T-I/SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24CSM01T-I/SM?
24CSM01T-I/SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24CSM01T-I/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 24CSM01T-I/SM?
For technical support, including 24CSM01T-I/SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CSM01T-I/SM requirements.
6.How does Aetrix verify that 24CSM01T-I/SM is sourced from the original manufacturer or authorized distributors?
All 24CSM01T-I/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 24CSM01T-I/SM meets industry standards.
7.What is the process for return or replacement of 24CSM01T-I/SM?
All 24CSM01T-I/SM units undergo pre-shipment inspection (PSI). If there is an issue with 24CSM01T-I/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 24CSM01T-I/SM part is unused and in its original packaging.
Return procedure for 24CSM01T-I/SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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