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Microchip Technology AT24C64D-SSHM-B
- Part No.:
- AT24C64D-SSHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C64D-SSHM-B.pdf
- Description:
- IC EEPROM 64KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:13,892
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Product details
Overview
AT24C64D-SSHM-B from Microchip Technology is a 64-Kbit I²C-compatible serial EEPROM organized as 8,192 × 8 bits, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C), 1 MHz Fast Mode Plus support at ≥2.5V, and hardware write protection via WP pin - used for firmware parameter storage in embedded controllers, sensor calibration data retention, and configuration backup in industrial PLCs.
For engineers reviewing the AT24C64D-SSHM-B datasheet, AT24C64D-SSHM-B pinout, AT24C64D-SSHM-B application, or AT24C64D-SSHM-B equivalent, key selection considerations include VCC voltage compatibility (1.7–5.5V), I²C bus speed mode alignment (Standard/Fast/Fast Mode Plus), page write capability (32-byte), endurance (1M cycles), and package-specific pin mapping for SOIC-8 footprint integration.
Technical Context
The AT24C64D-SSHM-B implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain bidirectional data transfer protocol. It supports three speed modes: 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), and 1 MHz Fast Mode Plus (2.5–5.5V), with automatic ACK/NACK handling and start/stop condition detection.
Internally organized as 256 pages of 32 bytes, it features hardware address inputs (A0–A2) enabling up to eight devices on one bus, a dedicated Write-Protect (WP) pin for full-array lock, and Power-on Reset (POR) with tPUP = 100 µs minimum delay before command acceptance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8), supporting firmware config storage without external address latches |
| VCC Range | 1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers |
| I²C Speed Modes | 100 kHz / 400 kHz / 1 MHz FM+ - allows bandwidth scaling per system noise and timing budget |
| Write Endurance | 1,000,000 cycles - supports frequent recalibration or logging in field-deployed equipment |
| Data Retention | 100 years at 55°C - ensures long-term reliability in unattended industrial installations |
| Active Current | ≤3.0 mA max at 5V/400 kHz - minimizes power impact during active writes in battery-backed systems |
| Standby Current | ≤6.0 µA at 5V - enables ultra-low-power hold state in always-on edge nodes |
| Write Cycle Time | ≤5 ms max - defines worst-case blocking time for host software during page writes |
Pinout & Package
AT24C64D-SSHM-B is supplied in an 8-lead SOIC package (3.9mm × 4.9mm body, 1.27mm pitch), pin-compatible with industry-standard 8-pin EEPROM footprints. The package includes gull-wing leads, Pb-free (RoHS-compliant) finish, and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware Device Address Input | Configures LSB of 7-bit I²C slave address; tied high/low to enable multi-device bus addressing (up to 8 units) |
| A1 | Hardware Device Address Input | Configures middle bit of 7-bit I²C slave address; required for unique addressing in stacked EEPROM configurations |
| A2 | Hardware Device Address Input | Configures MSB of 7-bit I²C slave address; enables full 3-bit hardware address space (0x50–0x57) |
| GND | Ground Reference | System return path for VCC and all I/O; must be low-impedance connection to avoid noise-induced ACK failures |
| SDA | Serial Data Bidirectional I/O | Open-drain line requiring external pull-up (≤10 kΩ); carries command, address, and data; shared across I²C bus |
| SCL | Serial Clock Input | Host-generated clock controlling data sampling edges; rising edge latches input, falling edge outputs data |
| WP | Write-Protect Control | Hardware lock: driven high to disable all writes; internally pulled down if floating - prevents accidental overwrites |
| VCC | Power Supply Input | 1.7–5.5V supply; must ramp monotonically at ≤0.1 V/µs; POR activates only after stable VCC ≥1.5V |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte Page Write Mode | Enables burst programming of up to 32 bytes per write cycle - reduces host CPU overhead vs. byte-by-byte writes |
| Schmitt Trigger Inputs | Rejects <100 ns noise spikes on SDA/SCL - improves robustness in electrically noisy industrial environments |
| Fast Mode Plus Support | 1 MHz operation at 2.5–5.5V - doubles throughput vs. standard Fast Mode for time-critical configuration updates |
| ESD Protection >4 kV | Withstands HBM-level ESD events during board handling and field service - reduces failure rate in manual assembly |
| Green Packaging | Lead-free, halide-free, RoHS-compliant SOIC - meets global environmental compliance requirements for industrial shipments |
| Self-Timed Write Cycle | Internal timing eliminates need for host polling delay - simplifies firmware by using ACK polling instead of fixed delays |
Applications
| Industrial Sensor Calibration Storage | Embedded Controller Configuration Backup |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and linearization tables for analog sensor front-ends in process transmitters. IC Role / Device Role / Timing Role: Nonvolatile parameter repository accessed at power-up and during field recalibration; retains data across 100-year lifetime. Use Value: Eliminates need for external trimming potentiometers or costly laser calibration; enables field-updatable calibration via I²C. | Use Scenario: Holding user-defined settings (IP address, baud rate, alarm thresholds) in programmable logic controllers (PLCs) and HMIs. IC Role / Device Role / Timing Role: System configuration memory mapped into microcontroller's I²C peripheral; read at boot, written during setup mode. Use Value: Survives power loss and firmware updates; supports >1M reconfiguration cycles over product lifetime. |
| Smart Meter Firmware Parameter Storage | Medical Device Safety-Critical Settings |
Use Scenario: Storing tariff schedules, metering constants, and tamper-event logs in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, write-protected storage accessed via isolated I²C bus; WP pin hardwired to VCC during normal operation. Use Value: Prevents unauthorized parameter modification; 100-year retention ensures accuracy over meter's 20+ year service life. | Use Scenario: Archiving device-specific safety limits (dose thresholds, motor torque caps) in FDA-cleared infusion pumps and diagnostic analyzers. IC Role / Device Role / Timing Role: Certified nonvolatile memory storing immutable operational constraints; accessed only by certified bootloader during self-test. Use Value: Meets IEC 62304 SW safety Class C requirements; 1M endurance supports full lifecycle verification testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95640-DRMN6TP/K | SPI interface (not I²C); 5V-only operation (4.5–5.5V); no WP pin - uses software write protection | Requires SPI-capable MCU; incompatible with existing I²C bus topology; lacks hardware lock for critical settings | Select only when migrating to SPI-based architecture and 5V-only systems; not drop-in compatible |
| 24LC64-I/P | Same 64K I²C EEPROM but rated for industrial temp (–40°C to +85°C) with 100 kHz/400 kHz only - no 1 MHz FM+ support | Limited to lower-speed buses; suitable where timing margin is tight and noise immunity less critical | Use when cost sensitivity outweighs speed requirement; verify AC timing margins for 400 kHz operation |
Compared with AT24C64D-SSHM-B, M95640-DRMN6TP/K requires PCB redesign for SPI routing and lacks hardware write protection, while 24LC64-I/P omits 1 MHz Fast Mode Plus - limiting throughput in high-update-rate applications like real-time calibration logging.
Availability
AT24C64D-SSHM-B is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded controller configuration backup, and smart meter firmware parameter storage requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AT24C64D-SSHM-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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The AT24C64D belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-voltage, I²C-based nonvolatile data storage in space-constrained industrial, automotive, and medical systems.
FAQ
What is the maximum I²C clock frequency supported by AT24C64D-SSHM-B?
The AT24C64D-SSHM-B supports 100 kHz Standard Mode (1.7–5.5V), 400 kHz Fast Mode (1.7–5.5V), and 1 MHz Fast Mode Plus (2.5–5.5V). At 1.7–2.4V, only Standard and Fast Modes apply. The 1 MHz capability enables faster configuration loading in time-sensitive applications, and AT24C64D-SSHM-B's internal timing ensures reliable operation within these AC specifications.
Does AT24C64D-SSHM-B require external pull-up resistors on SDA and SCL lines?
Yes, AT24C64D-SSHM-B requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is an input. Microchip specifies maximum values of 10 kΩ for SDA (and recommends ≤4 kΩ for 400 kHz, ≤1.3 kΩ for 1 MHz) to meet rise-time requirements. AT24C64D-SSHM-B does not include internal pull-ups, so omission will cause communication failure.
How does the Write-Protect (WP) pin function on AT24C64D-SSHM-B?
When WP is driven high (to VCC), AT24C64D-SSHM-B disables all write operations to the entire memory array. When WP is low (GND) or floating (internally pulled down), writes are enabled. Microchip recommends hardwiring WP to a known state - AT24C64D-SSHM-B's internal pull-down is strong but susceptible to capacitive coupling, so intentional routing avoids spurious unlocks.
What is the memory organization and page structure of AT24C64D-SSHM-B?
AT24C64D-SSHM-B organizes its 64 Kbit as 8,192 words × 8 bits, segmented into 256 pages of 32 bytes each. This page structure enables efficient 32-byte burst writes - partial page writes are allowed, and AT24C64D-SSHM-B automatically handles wraparound within the same page boundary during sequential writes.
Is AT24C64D-SSHM-B compatible with standard I²C protocol and address mapping?
Yes, AT24C64D-SSHM-B uses standard 7-bit I²C addressing with device type identifier '1010' (0xA) and hardware-configurable A2/A1/A0 bits, yielding addresses 0x50–0x57. It fully complies with I²C specification timing, ACK/NACK behavior, start/stop conditions, and read/write protocols - AT24C64D-SSHM-B interoperates with any standard I²C master without custom driver modifications.
AT24C64D-SSHM-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K 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-SOIC
AT24C64D-SSHM-B FAQ
1.How can I place an order for AT24C64D-SSHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C64D-SSHM-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 AT24C64D-SSHM-B reliable?
The price and inventory of AT24C64D-SSHM-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C64D-SSHM-B is usually 5 days.
3.What payment methods are accepted for AT24C64D-SSHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C64D-SSHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C64D-SSHM-B?
AT24C64D-SSHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C64D-SSHM-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 AT24C64D-SSHM-B?
For technical support, including AT24C64D-SSHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C64D-SSHM-B requirements.
6.How does Aetrix verify that AT24C64D-SSHM-B is sourced from the original manufacturer or authorized distributors?
All AT24C64D-SSHM-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 AT24C64D-SSHM-B meets industry standards.
7.What is the process for return or replacement of AT24C64D-SSHM-B?
All AT24C64D-SSHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24C64D-SSHM-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 AT24C64D-SSHM-B part is unused and in its original packaging.
Return procedure for AT24C64D-SSHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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