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Microchip Technology 24CSM01T-I/SN
- Part No.:
- 24CSM01T-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24CSM01T-I/SN.pdf
- Description:
- IC EEPROM 1MBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,205
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Product details
Overview
24CSM01T-I/SN 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, 256-byte user-lockable ID page, hardware write-protect pin, and operates across 1.7V–5.5V. Used in automotive infotainment control modules for storing calibration data and secure device identity.
For engineers reviewing the 24CSM01T-I/SN datasheet, 24CSM01T-I/SN pinout, 24CSM01T-I/SN application, or 24CSM01T-I/SN equivalent, key selection considerations include its AEC-Q100 qualification, dual-mode write protection (hardware WP pin + software-configurable zone lock), built-in ECC correction for four-byte reads, and support for up to eight devices on a shared I²C bus with configurable 7-bit client addressing via A1/A2 pins.
Technical Context
The 24CSM01T-I/SN implements a two-wire I²C interface with full High-Speed mode (3.4 MHz) compliance, Schmitt-trigger inputs, and slope-controlled outputs to suppress ground bounce. Its memory architecture comprises a 131,072 × 8-bit main array plus a separate 4-Kbit security register split into read-only 128-bit serial number and user-programmable/lockable 256-byte ID page.
Device operation is governed by three dedicated registers: Configuration register (enables enhanced software write protection per 128-Kbit zone and locks after programming), Security register (supports irreversible ID page locking), and Manufacturer ID register (24-bit I²C-compliant identifier). Write cycles are self-timed (≤5 ms), and ECC corrects single-bit errors within any four-byte read window, with an Error Correction State (ECS) latch flag in the Configuration register.
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 firmware parameter storage with page-write efficiency. |
| I²C Speed | Up to 3.4 MHz (High-Speed mode), also supports 1 MHz / 400 kHz / 100 kHz - allows fast configuration loading in real-time systems without bus contention. |
| Write Endurance | 1,000,000 erase/write cycles - ensures reliable field updates over product lifetime in automotive ECUs. |
| Data Retention | >200 years at 55°C - guarantees long-term integrity of calibration, VIN, and cryptographic keys. |
| Operating Voltage | 1.7V to 5.5V - interoperable with 1.8V, 3.3V, and 5V microcontrollers without level-shifting. |
| Temperature Range | Industrial grade: –40°C to +85°C - validated for under-hood and dashboard-mounted automotive applications. |
| ESD Protection | >4000 V HBM - withstands handling and system-level ESD events in manufacturing and service environments. |
Pinout & Package
24CSM01T-I/SN is packaged in 8-lead SOIC (Small Outline Integrated Circuit) with wettable flank leads, compliant with IPC/JEDEC J-STD-020 moisture sensitivity level 3. The package supports automated optical inspection (AOI) and provides robust solder joint reliability for automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Hardware Address Input | Configures bit 1 of 7-bit I²C client address; must be hardwired to VSS or VCC to select one of four possible addresses on shared bus. |
| A2 | Hardware Address Input | Configures bit 2 of 7-bit I²C client address; used with A1 to enable up to four 24CSM01T-I/SN devices on same I²C bus. |
| VSS | Ground Reference | Primary return path for all internal circuitry; requires low-impedance connection to system ground plane. |
| SDA | Serial Data Line | Open-drain bidirectional I²C data line; requires external pull-up resistor (330 Ω for 3.4 MHz, 2 kΩ for 1 MHz). |
| SCL | Serial Clock Line | Input-only I²C clock line; driven by host MCU; slope control minimizes ground bounce during transitions. |
| WP | Write-Protect Control | Active-high hardware lock: tied to VCC disables all writes to main array and security register; ignored in enhanced software protection mode. |
| VCC | Power Supply | 1.7V–5.5V supply input; includes internal POR circuit requiring ≥100 µs stabilization before first command. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed 128-Bit Serial Number | Globally unique identifier preloaded at wafer test - eliminates post-manufacturing serialization effort and enables secure device binding. |
| User-Lockable 256-Byte ID Page | Security register section programmable via I²C and permanently lockable by software sequence - stores immutable keys, certificates, or calibration fingerprints. |
| Built-In ECC Logic | Corrects single-bit errors in any four-byte read window and sets ECS latch - improves data integrity without host-side error-handling overhead. |
| Dual Write Protection Modes | Hardware (WP pin) and software (Configuration register) modes - supports legacy designs while enabling fine-grained 128-Kbit zone protection for new architectures. |
| AEC-Q100 Qualified | Qualified to Grade 2 (–40°C to +105°C ambient) and tested per stress test requirements - meets automotive functional safety readiness for non-safety-critical memory. |
Applications
| Infotainment System Calibration Storage | Automotive ECU Secure Boot Key Vault |
|---|---|
Use Scenario: Storing display gamma tables, audio equalizer presets, and regional language packs in head unit modules. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during boot and runtime via I²C; supports concurrent reads during vehicle operation. Use Value: Enables field-upgradable UI assets without firmware reflashing; 200-year retention ensures data persistence across vehicle lifecycle. | Use Scenario: Holding immutable public keys and signature counters used during UDS-based secure boot verification in gateway ECUs. IC Role / Device Role / Timing Role: Tamper-resistant key repository with hardware+software write lock; accessed only during boot sequence via authenticated I²C session. Use Value: Prevents unauthorized key modification via WP pin + locked Configuration register; ECC ensures key integrity despite radiation-induced bit flips. |
| ADAS Camera Module Lens Calibration | Telematics Control Unit (TCU) IMEI/ICCID Binding |
Use Scenario: Storing per-lens distortion coefficients and focus offset maps in surround-view camera modules. IC Role / Device Role / Timing Role: Factory-programmed calibration data storage; accessed once per power cycle during sensor initialization. Use Value: 128-bit serial number binds calibration data to specific lens assembly; prevents mismatched calibration in high-volume production. | Use Scenario: Persisting SIM card ICCID and modem IMEI in embedded telematics units for carrier authentication and regulatory reporting. IC Role / Device Role / Timing Role: Secure identity anchor with lockable ID page; written once at provisioning and never modified in field. Use Value: User-programmable 256-byte ID page stores cryptographically signed binding records; permanent lock prevents cloning or SIM-swapping attacks. |
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, no ECC, max 1 MHz I²C, -40°C to +85°C | Lacks 128-bit serial number and lockable ID page; insufficient for secure identity or calibration binding | Select only for cost-sensitive non-automotive applications where security and ECC are unnecessary. |
| BR24G128FJ-WE2 | 128-Kbit, built-in ECC, 1.7–5.5V, -40°C to +105°C, but no factory serial number or user-lockable ID page | Provides ECC and extended temperature but cannot replace 24CSM01T-I/SN's secure identity functions | Use when ECC and AEC-Q100 are required but device serialization is handled externally. |
Compared with AT24CS128-SSHL-T and BR24G128FJ-WE2, the 24CSM01T-I/SN uniquely combines 1-Mbit density, AEC-Q100 qualification, factory-serialized identity, lockable security register, and on-die ECC - making it the only option for automotive systems requiring both high-capacity configuration storage and hardware-enforced device authenticity.
Availability
24CSM01T-I/SN is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, telematics control units, and gateway ECUs requiring stable component supply with long-term lifecycle assurance.
Supply support for 24CSM01T-I/SN 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, and consumer markets with vertically integrated silicon and software platforms.
The 24CSM01T-I/SN belongs to Microchip's CS-series serial EEPROM family, designed specifically for automotive-grade nonvolatile storage where security, reliability, and I²C interoperability are critical - including calibration data, secure keys, and device identity binding.
FAQ
What is the maximum I²C clock frequency supported by the 24CSM01T-I/SN?
The 24CSM01T-I/SN supports High-Speed mode I²C up to 3.4 MHz 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, the maximum clock frequency is 1 MHz. This dual-speed capability allows optimization for speed in 3.3V/5V systems or power efficiency in 1.8V battery-backed applications. All timing parameters are fully specified in DS20006781D.
Does the 24CSM01T-I/SN include error correction, and how does it function?
Yes, the 24CSM01T-I/SN includes built-in Error Correction Code (ECC) logic that corrects up to one incorrectly read bit within any four-byte read window. When ECC correction is invoked, the Error Correction State (ECS) latch in the Configuration register is set and remains asserted until cleared by software. This hardware-level correction eliminates the need for host-side CRC checks or retry logic, improving system robustness in electrically noisy automotive environments where the 24CSM01T-I/SN is commonly deployed.
How is the 128-bit serial number implemented in the 24CSM01T-I/SN?
Each 24CSM01T-I/SN device contains a factory-programmed, globally unique 128-bit serial number stored in the first 16 bytes (0800h–080Fh) of its security register. This value is laser-trimmed during wafer test and is guaranteed unique across the entire CS-series EEPROM family. It is read-only and cannot be altered, erased, or reprogrammed - providing a tamper-proof hardware identity for device binding, anti-counterfeiting, and secure provisioning workflows using the 24CSM01T-I/SN.
Can the 24CSM01T-I/SN be used in systems requiring AEC-Q100 compliance?
Yes, the 24CSM01T-I/SN is explicitly AEC-Q100 qualified (Grade 2, –40°C to +105°C ambient) and rated for industrial temperature (–40°C to +85°C) operation. Its qualification includes stress testing for temperature cycling, humidity bias, ESD, and mechanical shock - meeting automotive electronic component reliability requirements. The "I" suffix in 24CSM01T-I/SN denotes industrial temperature grade, and the device is approved for use in infotainment, ADAS, and telematics subsystems where AEC-Q100 compliance is mandatory.
What write protection mechanisms does the 24CSM01T-I/SN provide?
The 24CSM01T-I/SN offers two independent write protection mechanisms: (1) Hardware protection via the WP pin - tying WP to VCC disables all writes to both main memory and security register; (2) Enhanced software protection via the Configuration register - allows locking individual 128-Kbit zones and permanently disabling further changes to the Configuration register itself. These mechanisms can be used separately or together, giving designers flexibility to protect calibration data, keys, or serial numbers at different stages of the product lifecycle using the 24CSM01T-I/SN.
24CSM01T-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
24CSM01T-I/SN FAQ
1.How can I place an order for 24CSM01T-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24CSM01T-I/SN 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/SN reliable?
The price and inventory of 24CSM01T-I/SN 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/SN is usually 5 days.
3.What payment methods are accepted for 24CSM01T-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CSM01T-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24CSM01T-I/SN?
24CSM01T-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24CSM01T-I/SN 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/SN?
For technical support, including 24CSM01T-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CSM01T-I/SN requirements.
6.How does Aetrix verify that 24CSM01T-I/SN is sourced from the original manufacturer or authorized distributors?
All 24CSM01T-I/SN 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/SN meets industry standards.
7.What is the process for return or replacement of 24CSM01T-I/SN?
All 24CSM01T-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24CSM01T-I/SN, 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/SN part is unused and in its original packaging.
Return procedure for 24CSM01T-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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