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Microchip Technology 24CSM01-E/SN
- Part No.:
- 24CSM01-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
24CSM01-E/SN.pdf
- Description:
- IC EEPROM 1MBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,488
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Product details
Overview
24CSM01-E/SN from Microchip Technology is a 1-Mbit I²C serial EEPROM with integrated security register, ECC error correction, and AEC-Q100 automotive qualification. It operates from 1.7V to 5.5V, supports up to 3.4 MHz High-Speed I²C, and features factory-programmed 128-bit serial number plus 256-byte lockable ID page - used in automotive body control modules for secure calibration storage and firmware version tracking.
For engineers reviewing the 24CSM01-E/SN datasheet, 24CSM01-E/SN pinout, 24CSM01-E/SN application, or 24CSM01-E/SN equivalent, key selection considerations include its dual write-protection modes (hardware WP pin + software-configurable zone protection), built-in ECC for bit-error recovery in harsh environments, and extended temperature support (–40°C to +125°C) required for under-hood automotive deployments.
Technical Context
The 24CSM01-E/SN implements a two-wire I²C interface with configurable High-Speed mode (3.4 MHz) and standard modes (100 kHz/400 kHz/1 MHz), using Schmitt-trigger inputs and slope-controlled outputs to suppress noise and ground bounce. Its memory architecture comprises one 131,072 × 8-bit array organized into 512 pages of 256 bytes each, plus a dedicated 4-Kbit security register split into read-only 128-bit serial number and user-programmable 256-byte ID page.
Device operation is governed by three internal registers: Configuration register (enabling enhanced software write protection per 128-Kbit zone), Security register (with permanent lock capability), and Manufacturer ID register (24-bit I²C-compliant identifier). Write cycles are self-timed (≤5 ms), and ECC logic corrects single-bit errors within any four-byte readout, with an Error Correction State (ECS) latch flagging correction events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (131,072 × 8 bits), organized as 512 pages × 256 bytes - enables efficient firmware patch storage with page-write efficiency. |
| I²C Speed | Up to 3.4 MHz High-Speed mode (2.5V–5.5V, Industrial temp); also supports 1 MHz / 400 kHz / 100 kHz - ensures fast parameter updates in real-time vehicle networks. |
| Write Endurance | 1,000,000 erase/write cycles - supports frequent recalibration logging in ADAS sensor modules over full vehicle lifetime. |
| Data Retention | >200 years at 55°C - guarantees long-term integrity of VIN, calibration IDs, and cryptographic keys without refresh. |
| Operating Voltage | 1.7V to 5.5V - compatible with 1.8V microcontrollers and legacy 5V automotive subsystems without level-shifting. |
| Temperature Range | –40°C to +125°C (Extended grade) - validated for engine bay, transmission control, and powertrain applications. |
| ESD Protection | >4000V HBM - withstands handling and system-level ESD events in manufacturing and field service. |
Pinout & Package
24CSM01-E/SN is packaged in 8-lead SOIC (Small Outline Integrated Circuit) with industry-standard 150-mil body width and 1.27 mm pitch. Pin 1 is marked with a notch or dot; package meets RoHS and AEC-Q100 Grade 1 requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS - no electrical function or timing impact. |
| 2 (A1) | Hardware Address Input | Configures LSB of 2-bit device address; sets unique I²C client address when hardwired to VSS/VCC - enables up to four devices on same bus. |
| 3 (A2) | Hardware Address Input | Configures MSB of 2-bit device address; combined with A1, selects one of four possible I²C addresses (1010xxxA) - essential for multi-EEPROM systems. |
| 4 (VSS) | Ground Reference | Primary return path for all internal circuits and I/O leakage; requires low-impedance connection to system GND plane. |
| 5 (SDA) | Serial Data Line | Open-drain bidirectional I²C data line; requires external pull-up resistor (330Ω for 3.4 MHz); changes only during SCL low - defines data transfer timing window. |
| 6 (SCL) | Serial Clock Input | Input-only clock line synchronized to host MCU; rise/fall times ≤1000 ns/300 ns ensure reliable high-speed communication - critical for jitter-sensitive timing. |
| 7 (WP) | Write-Protect Control | Active-high hardware lock: tied to VCC disables all writes to memory and security register; tied to VSS enables full write access - provides fail-safe protection during boot. |
| 8 (VCC) | Power Supply | 1.7V–5.5V operating supply; must ramp monotonically at ≤0.1 V/µs; decoupling capacitor (100 nF) required within 10 mm - ensures stable POR and ECC operation. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed 128-Bit Serial Number | Unique across entire CS series; eliminates line-side serialization effort and enables traceability in Tier-1 automotive production. |
| Enhanced Software Write Protection | Configuration register allows independent locking of eight 128-Kbit zones via software sequence - supports hierarchical firmware partitioning (e.g., bootloader vs. application). |
| Built-In ECC Logic | Corrects single-bit errors in any 4-byte read; ECS latch flags correction event - improves reliability in radiation-prone or thermally stressed environments. |
| I²C Manufacturer Identification Function | Returns unique 24-bit ID on command - enables automatic device identification and firmware compatibility validation during system startup. |
| AEC-Q100 Qualified (Grade 1) | Validated for automotive use including temperature cycling, HTOL, and ESD - satisfies functional safety requirements for ASIL-B systems without additional qualification. |
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 configuration memory with secure read/write access via I²C; retains settings across ignition cycles and battery disconnects. Use Value: Factory-programmed 128-bit serial number enables anti-counterfeit verification; ECC ensures integrity of user-customized settings after 15+ years of thermal cycling. | Use Scenario: Holding calibrated sensor offsets, I/O mapping tables, and firmware update metadata in modular automation controllers. IC Role / Device Role / Timing Role: High-reliability parameter store interfaced to ARM Cortex-M7 host MCU via 1 MHz I²C; accessed during cold start and runtime reconfiguration. Use Value: Dual write-protection modes prevent accidental overwrite during field firmware updates; 1M write cycles support daily recalibration logs for 27 years. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Vault |
Use Scenario: Securing drug library parameters, dose limits, and regulatory audit logs in Class II medical devices. IC Role / Device Role / Timing Role: Tamper-resistant memory storing encrypted calibration constants and usage counters; accessed only during authorized service mode. Use Value: Lockable 256-byte ID page stores cryptographic keys; software-configurable zone protection isolates critical data from application firmware updates. | Use Scenario: Storing metering firmware signatures, tariff tables, and tamper-event history in ANSI C12.22-compliant smart meters. IC Role / Device Role / Timing Role: Secure nonvolatile vault with AEC-Q100 reliability; interfaces to metrology SoC via 400 kHz I²C with ECC-protected reads. Use Value: >200-year data retention guarantees compliance with 20-year utility certification; ESD-hardened pins survive field installation surges. |
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 (not 1 Mbit); no built-in ECC; lacks 128-bit serial number and manufacturer ID register. | Suitable for cost-sensitive consumer electronics where security and ECC are not required. | Select only if memory size, ECC, and automotive qualification are not design requirements. |
| BR24G128FJ-3GE2 | 128 Kbit; supports 1 MHz I²C only; no security register or software zone protection; rated –40°C to +85°C (not extended temp). | Fits industrial control panels with lower reliability demands and no automotive qualification needs. | Choose when extended temperature range, AEC-Q100, and 1-Mbit density are unnecessary. |
Compared with AT24CS128-SSHL-T and BR24G128FJ-3GE2, the 24CSM01-E/SN delivers 8× more memory, certified automotive operation, ECC-based data integrity, and factory-serialized identity - making it the sole option for ASIL-B-compliant systems requiring secure, long-life parameter storage.
Availability
24CSM01-E/SN is available at Aetrix Electronics and suitable for automotive body control units, industrial programmable logic controllers, and medical infusion pump designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.
Supply support for 24CSM01-E/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, communications, and consumer markets with vertically integrated silicon and software platforms.
The 24CSM01-E/SN belongs to Microchip's CS-series automotive EEPROM family, designed specifically for secure, high-reliability nonvolatile storage in safety-critical automotive subsystems - emphasizing ECC, serialization, and extended temperature robustness.
FAQ
What is the maximum I²C clock frequency supported by the 24CSM01-E/SN?
The 24CSM01-E/SN supports up to 3.4 MHz in High-Speed mode when VCC is 2.5V–5.5V and ambient temperature is within the Industrial range (–40°C to +85°C). At 1.7V–2.49V, maximum clock frequency is 1 MHz. This enables rapid parameter loading in time-critical automotive diagnostics and firmware updates.
Does the 24CSM01-E/SN require external pull-up resistors on SDA and SCL lines?
Yes, the 24CSM01-E/SN requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Recommended values are 330Ω for 3.4 MHz operation, 2 kΩ for 1 MHz/400 kHz, and 10 kΩ for 100 kHz - ensuring proper rise times and noise immunity per I²C specification.
How does the built-in ECC logic in the 24CSM01-E/SN operate during a read operation?
The 24CSM01-E/SN's ECC logic automatically checks every 4-byte readout for single-bit errors and corrects them transparently. When correction occurs, the Error Correction State (ECS) latch in the Configuration register is set and remains asserted until cleared by software - enabling host firmware to log or respond to memory integrity events.
Can the 128-bit serial number in the 24CSM01-E/SN be overwritten or modified?
No, the 128-bit serial number in the 24CSM01-E/SN is factory-programmed and permanently read-only. It resides in the first 16 bytes of the security register and is globally unique across the entire CS-series EEPROM family - providing immutable device identity for anti-counterfeiting and traceability without risk of corruption.
What is the purpose of the A1 and A2 pins on the 24CSM01-E/SN?
The A1 and A2 pins on the 24CSM01-E/SN configure the two least-significant bits of the 7-bit I²C device address, allowing up to four 24CSM01-E/SN devices to share the same I²C bus. They must be hardwired to either VSS or VCC - not left floating - to ensure deterministic addressing in multi-node automotive networks.
24CSM01-E/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
24CSM01-E/SN FAQ
1.How can I place an order for 24CSM01-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 24CSM01-E/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 24CSM01-E/SN reliable?
The price and inventory of 24CSM01-E/SN 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/SN is usually 5 days.
3.What payment methods are accepted for 24CSM01-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24CSM01-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24CSM01-E/SN?
24CSM01-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24CSM01-E/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 24CSM01-E/SN?
For technical support, including 24CSM01-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24CSM01-E/SN requirements.
6.How does Aetrix verify that 24CSM01-E/SN is sourced from the original manufacturer or authorized distributors?
All 24CSM01-E/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 24CSM01-E/SN meets industry standards.
7.What is the process for return or replacement of 24CSM01-E/SN?
All 24CSM01-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 24CSM01-E/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 24CSM01-E/SN part is unused and in its original packaging.
Return procedure for 24CSM01-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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