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Microchip Technology AT24CM01-SHM-B
- Part No.:
- AT24CM01-SHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT24CM01-SHM-B.pdf
- Description:
- IC EEPROM 1MBIT I2C 1MHZ 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:375
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Product details
Overview
AT24CM01-SHM-B from Microchip Technology is a 1-Mbit I²C-compatible serial EEPROM organized as 131,072 × 8 bits, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), Fast Mode Plus (1 MHz) support, and hardware write protection via WP pin - used for nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.
For engineers reviewing the AT24CM01-SHM-B datasheet, AT24CM01-SHM-B pinout, AT24CM01-SHM-B application, or AT24CM01-SHM-B equivalent, this page delivers verified pin functions, real-world timing behavior (tWR ≤ 5 ms), noise-immune interface design (Schmitt triggers + input filtering), and drop-in alternatives for legacy I²C EEPROM migration paths.
Technical Context
The AT24CM01-SHM-B implements a two-wire I²C slave interface with bidirectional SDA and unidirectional SCL, supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) speeds depending on VCC level. It uses internal address latching with A1/A2 hardware-selectable device addressing (up to four devices per bus) and includes a dedicated Write-Protect (WP) pin that disables all writes when driven high.
Internally, memory is structured as 512 pages of 256 bytes each, enabling byte-write and partial-page-write operations. Built-in error detection and correction, plus Power-on Reset (POR) with tPUP = 100 µs, ensure reliable operation during brown-out and bus contention scenarios without external reset circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (131,072 × 8), sufficient for full firmware parameter sets or multi-sensor calibration tables |
| Interface | I²C-compatible two-wire (SCL/SDA), no additional control lines required beyond WP and address pins |
| VCC Range | 1.7V–5.5V low-voltage grade, enabling direct use with 1.8V, 3.3V, and 5V microcontrollers |
| Write Speed | ≤5 ms max self-timed write cycle, eliminating need for polling delay in time-critical firmware updates |
| Endurance & Retention | 1,000,000 write cycles and 100-year data retention at 55°C, validated for long-life industrial deployments |
| Operating Temp | −40°C to +85°C industrial grade, qualified for automotive cabin modules and factory automation nodes |
| Standby Current | ≤6 µA at 5.5V, minimizing battery drain in always-on IoT edge sensors |
Pinout & Package
AT24CM01-SHM-B is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard 150-mil body width and 1.27 mm pitch. Pin 1 is marked with a beveled corner or dot; the package is RoHS-compliant, halide-free, and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No Connect | Unused die bond pad; must remain floating or tied to GND - no electrical function |
| 2 A1 | Hardware Address Input | Hardwired to GND/VCC to select one of four device addresses (1010xxxA) on shared I²C bus |
| 3 A2 | Hardware Address Input | Second address bit; combined with A1 enables up to four AT24CM01-SHM-B devices on same bus |
| 4 GND | Ground Reference | System ground return path; must be low-impedance connection to minimize noise coupling into SDA/SCL |
| 5 SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up (≤10 kΩ); supports wire-OR with other I²C slaves |
| 6 SCL | Serial Clock Input | Master-generated clock; rising edge latches input, falling edge outputs data; includes Schmitt trigger |
| 7 WP | Write-Protect Control | Drives high → full-array write inhibit; drives low → normal write access; internally pulled down if floating |
| 8 VCC | Power Supply | 1.7V–5.5V supply; must ramp monotonically at ≤0.1 V/µs; decoupling capacitor (0.1 µF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Fast Mode Plus (1 MHz) | Enables 2.5× faster writes vs. standard 400 kHz mode when VCC ≥ 2.5V - reduces firmware update latency |
| Schmitt-trigger inputs | Rejects >100 ns noise spikes on SCL/SDA, eliminating false start/stop detection in electrically noisy environments |
| 256-byte page write | Allows burst programming of up to 256 bytes per write cycle - optimal for logging sequential sensor data |
| Built-in ECC | Detects and corrects single-bit errors in stored data, preventing silent corruption in critical configuration registers |
| Ultra-low standby current | 6 µA max at 5.5V allows integration into battery-powered nodes with multi-year shelf life requirements |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory-floor cabinets. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed during boot and runtime via I²C; WP pin hardwired to prevent accidental overwrites during field service. Use Value: 100-year data retention ensures parameter integrity across 15+ year equipment lifecycles without battery backup. |
Use Scenario: Holding calibrated offset/gain coefficients for ECG, SpO₂, and temperature sensors in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, write-protected memory block initialized once during manufacturing and read-only during clinical operation. Use Value: Hardware WP pin prevents firmware-level tampering with calibration data - satisfies IEC 62304 Class B safety requirements. |
| Automotive Body Control Module | Smart Energy Meter Firmware Settings |
|
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock configurations in 12V automotive BCMs. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfacing directly with 3.3V MCU; operates reliably across −40°C to +85°C ambient range. Use Value: 1.7V minimum VCC enables continued operation during cold-cranking events where battery dips to 6V system voltage. |
Use Scenario: Storing tariff schedules, metering constants, and communication keys in ANSI C12.22-compliant smart electricity meters. IC Role / Device Role / Timing Role: Tamper-resistant storage with WP pin tied to secure microcontroller GPIO to enforce write-lock during field deployment. Use Value: 1Mbit capacity accommodates full AES-128 key set + 10+ years of billing history metadata without external flash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C1024-SSHM-T | Same 1-Mbit density, but only supports up to 400 kHz I²C; no Fast Mode Plus (1 MHz) capability | Lacks FM+ timing margin for high-throughput logging; suitable only where bus speed ≤400 kHz is guaranteed | Select when cost sensitivity outweighs speed requirement and existing layout uses SOIC-8 footprint |
| M95M01-RDW6TP | 1-Mbit SPI EEPROM (not I²C); 5V-only supply (4.5–5.5V); no WP pin - write protection via software command only | Requires SPI interface redesign and removes hardware-level write lock; incompatible with I²C bus topology | Choose only if migrating from SPI-based legacy designs and board space permits new routing for MOSI/MISO/SCK/CS |
Compared with AT24CM01-SHM-B, AT24C1024-SSHM-T offers identical pinout and voltage range but sacrifices 1 MHz FM+ performance, while M95M01-RDW6TP replaces I²C with SPI and eliminates hardware write protection - both require interface or security architecture reassessment.
Availability
AT24CM01-SHM-B is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive electronics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT24CM01-SHM-B 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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and broad automotive qualification coverage.
The AT24CM01-SHM-B belongs to Microchip's AT24Cxx family of I²C EEPROMs, designed specifically for robust, low-power nonvolatile storage in space-constrained and electrically noisy embedded systems.
FAQ
What is the maximum I²C clock frequency supported by the AT24CM01-SHM-B?
The AT24CM01-SHM-B supports 100 kHz (Standard Mode), 400 kHz (Fast Mode), and 1 MHz (Fast Mode Plus) I²C clock frequencies. Fast Mode Plus is enabled only when VCC is between 2.5V and 5.5V; below 2.5V, maximum speed reverts to 400 kHz. This dual-speed capability allows the AT24CM01-SHM-B to maintain compatibility with legacy 100/400 kHz systems while enabling faster firmware updates in newer designs.
Does the AT24CM01-SHM-B require external pull-up resistors on SDA and SCL lines?
Yes, the AT24CM01-SHM-B requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is an input. Microchip specifies maximum values of 10 kΩ for pull-ups, with recommended values of 4 kΩ for 400 kHz operation and 1.3 kΩ for 1 MHz Fast Mode Plus. The AT24CM01-SHM-B does not include internal pull-ups, so omission will result in bus failure.
How does the Write-Protect (WP) pin function on the AT24CM01-SHM-B?
When the WP pin of the AT24CM01-SHM-B is driven high (to VCC), all write operations - including byte, page, and erase - are inhibited across the entire 1-Mbit array. When WP is low (GND) or left floating (internally pulled down), normal write access is enabled. For safety-critical applications, Microchip recommends hardwiring WP to a controlled GPIO or fixed rail rather than relying on the internal pull-down.
What is the memory organization of the AT24CM01-SHM-B?
The AT24CM01-SHM-B organizes its 1-Mbit capacity as 131,072 words × 8 bits, segmented into 512 pages of 256 bytes each. This structure enables efficient page-write operations: up to 256 bytes can be written in a single self-timed cycle (≤5 ms), and partial-page writes are permitted. The addressing scheme uses A1/A2 pins for device selection and 17-bit word addressing for precise byte targeting.
Is the AT24CM01-SHM-B compatible with standard I²C protocol and ACK/NACK handshaking?
Yes, the AT24CM01-SHM-B fully complies with standard I²C protocol, including Start/Stop conditions, 9-bit transfer cycles (8 data + 1 ACK/NACK), and clock stretching during internal write cycles. It responds with ACK after successful device address match and NACK for invalid addresses or busy states. All timing parameters - including tHD.STA, tSU.STO, and tAA - meet I²C specification limits across its rated VCC and temperature ranges.
AT24CM01-SHM-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- 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:
- 550 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIJ
AT24CM01-SHM-B FAQ
1.How can I place an order for AT24CM01-SHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CM01-SHM-B 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 AT24CM01-SHM-B reliable?
The price and inventory of AT24CM01-SHM-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CM01-SHM-B is usually 5 days.
3.What payment methods are accepted for AT24CM01-SHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CM01-SHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CM01-SHM-B?
AT24CM01-SHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CM01-SHM-B 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 AT24CM01-SHM-B?
For technical support, including AT24CM01-SHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CM01-SHM-B requirements.
6.How does Aetrix verify that AT24CM01-SHM-B is sourced from the original manufacturer or authorized distributors?
All AT24CM01-SHM-B 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 AT24CM01-SHM-B meets industry standards.
7.What is the process for return or replacement of AT24CM01-SHM-B?
All AT24CM01-SHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CM01-SHM-B, 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 AT24CM01-SHM-B part is unused and in its original packaging.
Return procedure for AT24CM01-SHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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