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Microchip Technology AT24C64D-MAHM-T
- Part No.:
- AT24C64D-MAHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24C64D-MAHM-T.pdf
- Description:
- IC EEPROM 64KBIT I2C 8MINI MAP
- Quantity:
- Payment:
- Shipping:
Inventory:71,478
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Product details
Overview
AT24C64D-MAHM-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 across -40°C to +85°C, featuring 1 MHz Fast Mode Plus support at ≥2.5V, hardware write protection via WP pin, and 32-byte page write capability for embedded system configuration storage.
For engineers reviewing the AT24C64D-MAHM-T datasheet, AT24C64D-MAHM-T pinout, AT24C64D-MAHM-T application, or AT24C64D-MAHM-T equivalent, this device serves as a low-power, industrial-grade nonvolatile memory for firmware parameter storage, calibration data retention, and system identification in space-constrained microcontroller-based designs.
Technical Context
The AT24C64D-MAHM-T implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing modes depending on VCC level. Its internal architecture includes an 8,192-word × 8-bit EEPROM array segmented into 256 pages of 32 bytes each, enabling partial page writes and sequential/random read operations.
It integrates a Power-on Reset (POR) circuit with 1.5V threshold and requires ≥100 µs stable-VCC delay before first command; write cycles complete autonomously within 5 ms maximum, with hardware write protection controlled by the WP pin tied to VCC (full-array lock) or GND (unlocked).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits) - sufficient for storing bootloader config, sensor calibration tables, or device serial IDs |
| Supply Voltage | 1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters |
| Interface Speed | Up to 1 MHz (Fast Mode Plus) at VCC ≥ 2.5V - reduces firmware update latency in high-throughput systems |
| Write Endurance | 1,000,000 cycles - supports frequent field-updatable parameters in industrial logging applications |
| Data Retention | 100 years at 55°C - ensures long-term reliability for unattended equipment and infrastructure deployments |
| Active Current | ≤3.0 mA max at 5V/400 kHz - minimizes power budget impact during active configuration reads/writes |
| Standby Current | ≤6.0 µA at 5V - critical for battery-powered IoT nodes requiring multi-year operation |
Pinout & Package
AT24C64D-MAHM-T is supplied in an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flank leads for automated optical inspection. The exposed pad is internally connected to GND and must be soldered to PCB ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired to GND or VCC to select one of eight possible I²C addresses (1010xxxA); floating defaults to GND |
| A1 | Device Address Input | Second address bit; enables bus sharing with up to seven other AT24C64D devices on same SDA/SCL lines |
| A2 | Device Address Input | Third address bit; combined with A0/A1, forms 3-bit hardware address portion of 7-bit I²C slave address |
| GND | Ground Reference | System return path for VCC and signal logic; must be low-impedance connection to PCB ground plane |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up resistor ≤10 kΩ; supports wire-OR with other I²C devices |
| SCL | Serial Clock Input | Host-driven clock input; rising edge latches input data, falling edge outputs data; pull-up required if not actively driven |
| WP | Write-Protect Control | Hardware lock: tied to VCC disables all writes; tied to GND enables full-array programming; floating defaults to GND |
| VCC | Power Supply | 1.7–5.5V supply input; must ramp monotonically at ≤0.1 V/µs; decoupling capacitor (≥100 nF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Fast Mode Plus Support | 1 MHz I²C operation at 2.5–5.5V enables faster firmware updates and real-time parameter writes vs. legacy 400 kHz devices |
| Hardware Write Protection | WP pin provides tamper-resistant, zero-software-overhead memory locking - essential for secure boot configuration storage |
| Ultra-Low Standby Current | 6 µA max at 5V allows integration into always-on battery-backed systems without compromising runtime |
| 32-Byte Page Write | Enables efficient burst writes of sensor calibration blocks or network stack settings without per-byte overhead |
| Noise-Resilient Interface | Schmitt triggers + input filtering suppress EMI-induced glitches on SDA/SCL - improves robustness in motor-drive or industrial environments |
Applications
| Industrial Sensor Node | Medical Device Calibration |
|---|---|
Use Scenario: Remote temperature/humidity sensor node logs calibration coefficients and firmware version during factory setup and field recalibration. IC Role / Device Role / Timing Role: Nonvolatile storage for 128-byte calibration dataset with guaranteed 100-year retention and 1M write cycles. Use Value: Eliminates need for external backup battery or supercapacitor while supporting field-upgradable calibration without host MCU intervention. | Use Scenario: Portable blood glucose meter stores patient-specific calibration curves and usage history across battery replacements. IC Role / Device Role / Timing Role: Secure, low-power parameter memory accessed only during startup and user-initiated recalibration. Use Value: WP pin prevents accidental overwrites during routine operation; 1.7V operation ensures functionality during brownout conditions. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Electricity meter retains tariff schedules, billing counters, and tamper-event logs across power outages and firmware upgrades. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfacing directly with 3.3V metrology SoC via I²C at 400 kHz. Use Value: -40°C to +85°C rating guarantees operation in outdoor enclosures; 6 µA standby current extends backup battery life beyond 10 years. | Use Scenario: BCM stores seat position presets, mirror angles, and lighting profiles tied to vehicle VIN for personalized driver settings. IC Role / Device Role / Timing Role: Configuration memory mapped to microcontroller's I²C peripheral with WP pin hardwired to chassis ground. Use Value: UDFN package fits tight PCB spaces behind dashboard; 1.7V compatibility supports start-stop system voltage transients. |
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, 8-lead SOIC package (4.9 mm × 3.9 mm) - larger footprint, no wettable flanks | Preferred for through-hole prototyping or legacy board rework where UDFN reflow is unavailable | Select when manual soldering, visual inspection, or compatibility with existing SOIC footprints is required |
| M24C64-WMN6TP | STMicroelectronics 64-Kbit I²C EEPROM; 1.7–5.5V, -40°C to +85°C, but only supports up to 400 kHz (no FM+) | Lacks 1 MHz mode - limits throughput in high-speed configuration loading scenarios | Choose when cost sensitivity outweighs speed requirement and ST's qualification ecosystem is preferred |
Compared with AT24C64D-XHM-T, the AT24C64D-MAHM-T offers superior board-area efficiency and automated assembly yield via UDFN packaging; versus M24C64-WMN6TP, it delivers 2.5× faster write throughput in FM+ mode while maintaining identical voltage and temperature specs.
Availability
AT24C64D-MAHM-T is available at Aetrix Electronics and suitable for industrial sensor nodes, medical device calibration storage, and smart energy metering requiring stable component supply, RoHS-compliant green packaging, and long-term lifecycle assurance.
Supply support for AT24C64D-MAHM-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 global semiconductor company specializing in microcontrollers, analog, FPGA, and memory solutions, with emphasis on industrial, automotive, and aerospace reliability standards.
The AT24C64D-MAHM-T belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for low-voltage, high-reliability nonvolatile data storage in resource-constrained embedded systems.
FAQ
What is the maximum I²C clock frequency supported by AT24C64D-MAHM-T?
The AT24C64D-MAHM-T supports 100 kHz (Standard Mode), 400 kHz (Fast Mode), and 1 MHz (Fast Mode Plus). The 1 MHz mode requires VCC ≥ 2.5V. At 1.7–2.4V, only Standard and Fast Modes are valid. This graded speed support allows designers to optimize communication bandwidth based on system voltage rail constraints without changing the AT24C64D-MAHM-T part number.
Does AT24C64D-MAHM-T require external pull-up resistors on SDA and SCL lines?
Yes, AT24C64D-MAHM-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. The AT24C64D-MAHM-T itself does not include internal pull-ups, so omission of external resistors will prevent I²C bus functionality.
How does the WP pin function on AT24C64D-MAHM-T?
The WP (Write-Protect) pin on AT24C64D-MAHM-T provides hardware-level write inhibition: when tied to VCC, all memory writes are blocked; when tied to GND, normal write operations are enabled. If left floating, the pin is internally pulled down to GND, enabling writes - but Microchip recommends hardwiring WP to avoid noise-induced state changes. This behavior is fixed in the AT24C64D-MAHM-T silicon and cannot be overridden by software.
What is the memory organization of AT24C64D-MAHM-T?
The AT24C64D-MAHM-T organizes its 64 Kbit capacity as 8,192 words × 8 bits, physically arranged in 256 pages of 32 bytes each. This structure enables efficient 32-byte page writes (including partial-page writes) and supports random or sequential reads across the full address space. The page boundary alignment is fixed in the AT24C64D-MAHM-T design and affects write timing and ACK polling behavior.
Is AT24C64D-MAHM-T compatible with standard I²C protocol stacks?
Yes, AT24C64D-MAHM-T is fully compliant with the NXP I²C-bus specification for Standard, Fast, and Fast Mode Plus speeds. It implements standard START/STOP conditions, 7-bit addressing with R/W bit, ACK/NACK handshaking, and 9-clock-cycle-per-byte timing. No custom drivers are needed - the AT24C64D-MAHM-T works with generic I²C libraries in STM32 HAL, Arduino Wire, and Linux i2c-dev frameworks.
AT24C64D-MAHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not 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-UDFN (2x3)
AT24C64D-MAHM-T FAQ
1.How can I place an order for AT24C64D-MAHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C64D-MAHM-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-MAHM-T reliable?
The price and inventory of AT24C64D-MAHM-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-MAHM-T is usually 5 days.
3.What payment methods are accepted for AT24C64D-MAHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C64D-MAHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C64D-MAHM-T?
AT24C64D-MAHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C64D-MAHM-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-MAHM-T?
For technical support, including AT24C64D-MAHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C64D-MAHM-T requirements.
6.How does Aetrix verify that AT24C64D-MAHM-T is sourced from the original manufacturer or authorized distributors?
All AT24C64D-MAHM-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-MAHM-T meets industry standards.
7.What is the process for return or replacement of AT24C64D-MAHM-T?
All AT24C64D-MAHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C64D-MAHM-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-MAHM-T part is unused and in its original packaging.
Return procedure for AT24C64D-MAHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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