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Microchip Technology AT24C64D-SSHM-T
- Part No.:
- AT24C64D-SSHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C64D-SSHM-T.pdf
- Description:
- IC EEPROM 64KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:30,379
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Product details
Overview
AT24C64D-SSHM-T 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 2.5–5.5V, 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 AT24C64D-SSHM-T datasheet, AT24C64D-SSHM-T pinout, AT24C64D-SSHM-T application, or AT24C64D-SSHM-T equivalent, key selection criteria include guaranteed 1,000,000 write cycles, 100-year data retention, ultra-low standby current (6 µA max), page-write capability (32-byte), and compatibility with multi-device I²C bus topologies using A0/A1/A2 address inputs.
Technical Context
The AT24C64D-SSHM-T implements a two-wire I²C 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) clock rates across overlapping VCC ranges.
Internally organized as 256 pages of 32 bytes, it uses hardware address pins A0–A2 to enable up to eight devices on one bus, and includes a dedicated Write-Protect (WP) pin that disables all writes when pulled high - with internal pull-downs ensuring defined state if left unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 64 Kbit (8,192 × 8), enabling storage of firmware identifiers, calibration coefficients, or device-specific settings |
| Supply voltage | 1.7V to 5.5V - interoperable with 1.8V, 3.3V, and 5V logic domains without level shifting |
| Write endurance | 1,000,000 cycles - suitable for frequent parameter updates in industrial logging or adaptive control systems |
| Data retention | 100 years at 55°C - ensures long-term reliability in sealed or inaccessible deployments |
| Max standby current | 6 µA at 5.0V - minimizes battery drain in always-on IoT edge nodes and portable instrumentation |
| I²C speed modes | 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), 1 MHz (2.5–5.5V) - enables scalable throughput based on system timing budget |
| Page write size | 32 bytes - reduces write latency vs. byte-write; partial-page writes supported for efficient small-data updates |
| Write cycle time | ≤5 ms - deterministic erase-and-program timing simplifies host software timeout handling |
Pinout & Package
AT24C64D-SSHM-T is supplied in an 8-lead SOIC package (3.9mm × 4.9mm body, 1.27mm pitch). Pin functions are standardized across SOIC, TSSOP, UDFN, XDFN, and VFBGA variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device address input | Hardwired to GND/VCC to select one of eight possible I²C addresses (1010xxxR/W); internally pulled down if floating |
| A1 | Device address input | Second bit of 3-bit hardware address; enables multi-device bus expansion without external logic |
| A2 | Device address input | Third bit of 3-bit hardware address; allows full 8-device addressing with no software overhead |
| GND | Ground reference | System ground return path; must be low-impedance to ensure stable internal voltage regulation |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up (≤10 kΩ); supports wire-OR with other I²C devices |
| SCL | Serial clock input | Host-generated clock; rising edge latches input, falling edge outputs data; filtered for noise immunity |
| WP | Hardware write protect | Pulled high to disable all writes (full-array protection); internally pulled down if unconnected |
| VCC | Power supply | 1.7–5.5V operation; requires local decoupling capacitor (0.1 µF typical) near pin |
Key Features
| Feature | Design Value |
|---|---|
| Fast Mode Plus support | 1 MHz I²C operation at 2.5–5.5V enables faster configuration loading in time-critical boot sequences |
| Schmitt-trigger inputs | Enhanced noise immunity on SDA/SCL improves robustness in electrically noisy industrial environments |
| 32-byte page write | Reduces average write time by >90% vs. byte-write for sequential data blocks like firmware headers |
| Internal pull-downs on A0/A1/A2/WP | Ensures deterministic default state during power-up or unconnected PCB traces, reducing startup failures |
| Green packaging | RoHS-compliant, halide-free, lead-free SOIC meets global environmental compliance requirements |
| ESD protection | 4,000V HBM rating protects against handling damage and board-level ESD events during assembly |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and temperature compensation tables in pressure or humidity sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during sensor power-up or self-test sequence. Use Value: Enables field-replaceable sensor modules with unique calibration data preserved across 100+ years without backup power. | Use Scenario: Holding boot-time parameters (e.g., display brightness, network MAC address, UI language) in smart thermostats and HVAC controllers. IC Role / Device Role / Timing Role: I²C-configurable persistent storage mapped into microcontroller memory space during initialization. Use Value: Eliminates need for external battery-backed SRAM while supporting 1M+ field updates over product lifetime. |
| Power Supply Sequencing | Firmware Asset Storage |
Use Scenario: Recording last-known operational state (voltage rails active, fault flags, thermal history) in programmable power supplies before shutdown. IC Role / Device Role / Timing Role: Fail-safe memory element synchronized with PMIC interrupt signals to capture critical status pre-power-loss. Use Value: Allows rapid recovery and diagnostics after unexpected AC dropout, leveraging ≤5 ms write cycle for reliable state capture. | Use Scenario: Storing firmware version stamps, secure boot keys, and update rollback images in medical diagnostic equipment. IC Role / Device Role / Timing Role: Trusted configuration store accessed only by secure bootloader during authenticated firmware validation. Use Value: Provides tamper-resistant storage for cryptographic assets with hardware write-protection enforced via WP pin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C64D-XHM-T | Same die, identical electrical specs, but in 8-lead TSSOP (3×3 mm) instead of SOIC (3.9×4.9 mm) | Preferred for space-constrained PCBs where footprint reduction outweighs hand-soldering ease | Select when board area is constrained and reflow assembly is used; same pinout and software compatibility |
| M24C64-WMN6TP | STMicroelectronics 64-Kbit I²C EEPROM; supports 1 MHz only above 2.5V, 1M endurance, 40 µA max standby current | Higher standby current limits use in battery-powered applications requiring <10 µA sleep mode | Choose only if ST's qualification pedigree or existing supply chain mandates; verify WP pin behavior and timing margins |
Compared with AT24C64D-SSHM-T, the AT24C64D-XHM-T offers identical functionality in a smaller footprint but requires tighter layout tolerances, while M24C64-WMN6TP trades higher standby current for alternate vendor sourcing - neither is pin-compatible without layout revision due to differing package dimensions.
Availability
AT24C64D-SSHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and power supply sequencing requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT24C64D-SSHM-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 Inc. is a leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The AT24C64D belongs to Microchip's serial EEPROM product line, engineered for low-voltage, high-reliability nonvolatile storage in industrial, automotive, and consumer systems where data integrity and extended temperature operation are critical.
FAQ
What is the maximum I²C clock frequency supported by AT24C64D-SSHM-T?
The AT24C64D-SSHM-T 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). Operation at 1 MHz requires VCC ≥ 2.5V; below that, maximum clock rate drops to 400 kHz. These specifications are verified per DS20005937C, Table 4-3.
Does AT24C64D-SSHM-T require external pull-up resistors on SDA and SCL lines?
Yes, AT24C64D-SSHM-T requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is an input-only pin. Microchip specifies maximum pull-up values of 10 kΩ for 100 kHz, 4 kΩ for 400 kHz, and 1.3 kΩ for 1 MHz operation to meet rise-time requirements per Table 4-3.
How does the Write-Protect (WP) pin function on AT24C64D-SSHM-T?
When WP is driven high (to VCC), AT24C64D-SSHM-T inhibits all write operations to the entire memory array. When WP is at GND or left floating (internally pulled down), normal writes are enabled. The internal pull-down ensures safe default behavior but Microchip recommends hardwiring WP to avoid noise-induced glitches.
What is the guaranteed write endurance and data retention for AT24C64D-SSHM-T?
AT24C64D-SSHM-T guarantees 1,000,000 write cycles and 100 years of data retention at 55°C, as specified in Table 4-6 of DS20005937C. These values are characterized and qualified per Microchip's reliability testing protocols, not estimated or extrapolated.
Can multiple AT24C64D-SSHM-T devices share the same I²C bus?
Yes, up to eight AT24C64D-SSHM-T devices can share one I²C bus using hardware address pins A0, A1, and A2. Each combination of A0–A2 sets a unique 3-bit address suffix (1010xxxR/W), allowing independent addressing without software arbitration or additional hardware.
AT24C64D-SSHM-T 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:
- 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-T FAQ
1.How can I place an order for AT24C64D-SSHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C64D-SSHM-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 AT24C64D-SSHM-T reliable?
The price and inventory of AT24C64D-SSHM-T 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-T is usually 5 days.
3.What payment methods are accepted for AT24C64D-SSHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C64D-SSHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C64D-SSHM-T?
AT24C64D-SSHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C64D-SSHM-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 AT24C64D-SSHM-T?
For technical support, including AT24C64D-SSHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C64D-SSHM-T requirements.
6.How does Aetrix verify that AT24C64D-SSHM-T is sourced from the original manufacturer or authorized distributors?
All AT24C64D-SSHM-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 AT24C64D-SSHM-T meets industry standards.
7.What is the process for return or replacement of AT24C64D-SSHM-T?
All AT24C64D-SSHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C64D-SSHM-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 AT24C64D-SSHM-T part is unused and in its original packaging.
Return procedure for AT24C64D-SSHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT24C64D-SSHM-T Tags
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