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Microchip Technology AT24CM01-SHM-T
- Part No.:
- AT24CM01-SHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT24CM01-SHM-T.pdf
- Description:
- IC EEPROM 1MBIT I2C 1MHZ 8SOIJ
- Quantity:
- Payment:
- Shipping:
Inventory:4,760
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Product details
Overview
AT24CM01-SHM-T 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), 1 MHz Fast Mode Plus 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-T datasheet, AT24CM01-SHM-T pinout, AT24CM01-SHM-T application, or AT24CM01-SHM-T equivalent, key selection criteria include voltage compatibility (1.7–5.5 V), I²C bus speed support (up to 1 MHz), page-write capability (256-byte pages), ultra-low standby current (6 µA max), and hardware write-protection implementation using the WP pin.
Technical Context
The AT24CM01-SHM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain bidirectional data transfer. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing across overlapping VCC ranges.
Internally, it uses a cascaded address architecture with A1/A2 pins enabling up to four devices on one bus, and integrates error detection/correction logic, high-voltage generation for EEPROM programming, and Power-on Reset (POR) with 100 µs tPUP delay after stable VCC ≥ 1.7 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Mbit (131,072 × 8), enabling storage of firmware patches, calibration coefficients, or device IDs in space-constrained systems |
| VCC range | 1.7 V to 5.5 V - supports direct interfacing with 1.8 V, 2.5 V, 3.3 V, and 5 V microcontrollers without level shifters |
| I²C speed modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (FM+) - FM+ usable only at VCC ≥ 2.5 V; enables faster boot-time config loading |
| Write endurance | 1,000,000 cycles - suitable for frequent logging or runtime parameter updates in industrial controllers |
| Data retention | 100 years at 55°C - ensures long-term reliability in unattended equipment like smart meters or remote sensors |
| Standby current | 6 µA max at 5.5 V - critical for battery-backed real-time clocks or low-power IoT edge nodes |
| Page write size | 256 bytes - reduces write latency vs. byte-write; allows efficient bulk update of configuration blocks |
Pinout & Package
AT24CM01-SHM-T is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and halide-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 NC | No-connect | Unused internal pad; must be left floating or tied to GND per layout best practice - no electrical function |
| 2 A1 | Hardware device address input | Configures LSB of I²C slave address (1010 A2 A1 A16 R/W); hardwire to VCC/GND to select among up to four devices on same bus |
| 3 A2 | Hardware device address input | Configures MSB of I²C slave address; internal pull-down ensures default GND state if unconnected - but external tie recommended |
| 4 GND | Power ground reference | System return path for VCC and I/O; requires low-impedance connection to minimize noise coupling into SDA/SCL |
| 5 SDA | Serial data bidirectional line | Open-drain I/O requiring external pull-up (≤10 kΩ); shares bus with other I²C slaves; supports ACK/NACK handshaking |
| 6 SCL | Serial clock input | Master-generated clock; rising edge latches input, falling edge outputs data; includes internal noise filter and Schmitt trigger |
| 7 WP | Hardware write-protect control | Drives high → full-array write inhibit; drives low → normal write access; internal pull-down ensures safe default (write-enabled) |
| 8 VCC | Power supply input | Supplies core logic and EEPROM array; must ramp monotonically at ≤0.1 V/µs; decoupling capacitor (0.1 µF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Built-in error detection & correction | Enables reliable read-after-write verification without host-side CRC overhead - critical for safety-critical configuration storage |
| Schmitt triggers + input filtering | Rejects >50 ns noise spikes on SDA/SCL - eliminates false Start/Stop detection in electrically noisy industrial environments |
| Self-timed write cycle ≤5 ms | Guarantees completion before next command; removes need for host polling delay - simplifies firmware timing logic |
| 256-byte page write mode | Reduces 256-byte update time by ~255× vs. byte writes - accelerates factory programming or field firmware patching |
| Industrial temp range (−40°C to +85°C) | Validated operation across full range - supports deployment in automotive ECUs, outdoor telecom gear, and factory automation PLCs |
Applications
| Industrial Sensor Calibration | Smart Energy Metering |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and temperature compensation tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent calibration data accessed during power-up and runtime recalibration sequences. Use Value: Enables traceable, field-updatable calibration without reprogramming MCU flash - preserves MCU code integrity and simplifies ISO 9001 compliance. | Use Scenario: Retaining tariff schedules, billing counters, tamper logs, and cryptographic keys in DIN-rail mounted electricity meters operating 20+ years. IC Role / Device Role / Timing Role: Secure, long-life data vault with hardware write-protection (WP pin tied to secure controller) preventing unauthorized meter parameter changes. Use Value: Meets IEC 62056-21 and DLMS/COSEM requirements for 100-year data retention and 1M-cycle endurance under thermal cycling stress. |
| Automotive Body Control Module | Medical Diagnostic Equipment |
Use Scenario: Saving user preferences (mirror position, seat memory), fault codes, and adaptive learning parameters in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Fail-safe configuration store interfaced directly to 3.3 V CAN microcontroller over I²C - immune to load-dump transients due to 5.5 V VCC rating. Use Value: Eliminates need for external voltage supervisors or level shifters; WP pin tied to MCU GPIO enables dynamic lock/unlock of critical settings. | Use Scenario: Storing FDA-mandated device serial numbers, calibration history, usage counters, and audit trails in portable ultrasound and ECG analyzers. IC Role / Device Role / Timing Role: Tamper-evident, low-power memory for regulatory data logging - powered from backup coin cell during main power loss. Use Value: 6 µA standby current extends coin-cell life beyond 5 years; built-in ECC prevents undetected bit corruption in audit records. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M01-RDW6TP | SPI interface (not I²C); 1.8–5.5 V; 5 ms write time; no WP pin - uses software protection | Requires SPI-capable host; lacks hardware write lock - unsuitable where physical security is mandated | Select only if host lacks I²C or requires higher throughput than 1 MHz I²C permits |
| AT24CS128-SSHL-T | I²C-compatible; 128 Kbit (16K × 8); 1.7–5.5 V; 1 MHz FM+ support; identical SOIC-8 package and pinout | Lower density - appropriate when <128 KB config space suffices and cost sensitivity outweighs future-proofing | Drop-in replacement for lower-density use cases; shares same footprint, timing, and WP/SCL/SDA behavior |
Compared with M95M01-RDW6TP, AT24CM01-SHM-T offers hardware write protection and native I²C integration, reducing firmware complexity; versus AT24CS128-SSHL-T, it provides 8× more storage for complex system configurations while maintaining identical board-level compatibility.
Availability
AT24CM01-SHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, smart energy metering, automotive body control modules, and medical diagnostic equipment requiring stable component supply across extended product lifecycles.
Supply support for AT24CM01-SHM-T 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.
The AT24CM01-SHM-T belongs to Microchip's AT24C-series serial EEPROM product line, designed specifically for robust, low-power, I²C-based nonvolatile storage in harsh industrial and automotive environments.
FAQ
What is the maximum I²C clock frequency supported by the AT24CM01-SHM-T?
The AT24CM01-SHM-T supports I²C Fast Mode Plus at up to 1 MHz, but only when VCC is 2.5 V or higher. At 1.7–5.5 V, it operates at up to 400 kHz (Fast Mode), and at 100 kHz (Standard Mode) across the full voltage range. These modes are hardware-automated - no configuration register is needed to enable FM+.
Does the AT24CM01-SHM-T require external pull-up resistors on SDA and SCL lines?
Yes, the AT24CM01-SHM-T requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Microchip specifies ≤10 kΩ for reliable operation; typical values are 2.2 kΩ for 1 MHz FM+ (with 100 pF bus capacitance) and 4.7 kΩ for 400 kHz. The AT24CM01-SHM-T itself does not integrate pull-ups.
How is hardware write protection implemented on the AT24CM01-SHM-T?
Hardware write protection on the AT24CM01-SHM-T is controlled by the WP pin: when driven high (to VCC), all memory writes are inhibited; when driven low (to GND), normal write operations are permitted. The pin has an internal pull-down, so leaving it unconnected defaults to write-enabled - but Microchip recommends tying it explicitly to avoid noise-induced glitches.
What is the memory organization of the AT24CM01-SHM-T, and how does it affect addressing?
The AT24CM01-SHM-T is organized as 512 pages of 256 bytes each (131,072 × 8 bits). Addressing requires a 17-bit word address: the top bit (A16) is encoded in the device address byte, while A15–A0 are sent in two subsequent address bytes. This structure enables seamless page-aligned writes and avoids wraparound during sequential reads across page boundaries.
Is the AT24CM01-SHM-T compatible with legacy AT24C-series EEPROMs in terms of pinout and protocol?
Yes, the AT24CM01-SHM-T uses the same 8-pin SOIC footprint and pin assignments (A1, A2, GND, SDA, SCL, WP, VCC) as AT24C02 through AT24C512 devices. Its I²C protocol is fully backward-compatible - including device address format (1010 A2 A1 A16 R/W), ACK/NACK timing, and Start/Stop conditions - allowing drop-in upgrades where higher density is needed.
AT24CM01-SHM-T 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:
- 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-T FAQ
1.How can I place an order for AT24CM01-SHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CM01-SHM-T 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-T reliable?
The price and inventory of AT24CM01-SHM-T 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-T is usually 5 days.
3.What payment methods are accepted for AT24CM01-SHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CM01-SHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CM01-SHM-T?
AT24CM01-SHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CM01-SHM-T 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-T?
For technical support, including AT24CM01-SHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CM01-SHM-T requirements.
6.How does Aetrix verify that AT24CM01-SHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CM01-SHM-T 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-T meets industry standards.
7.What is the process for return or replacement of AT24CM01-SHM-T?
All AT24CM01-SHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CM01-SHM-T, 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-T part is unused and in its original packaging.
Return procedure for AT24CM01-SHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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