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Microchip Technology AT24C64D-MAHM-E
- Part No.:
- AT24C64D-MAHM-E
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24C64D-MAHM-E.pdf
- Description:
- IC EEPROM 64KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:27,591
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Product details
Overview
AT24C64D-MAHM-E 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 nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.
For engineers reviewing the AT24C64D-MAHM-E datasheet, AT24C64D-MAHM-E pinout, AT24C64D-MAHM-E application, or AT24C64D-MAHM-E equivalent, key selection criteria include VCC voltage range compatibility, 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/TSSOP/UDFN/XDFN/VFBGA footprints.
Technical Context
The AT24C64D-MAHM-E 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 depending on VCC level, with automatic address decoding using A0–A2 pins enabling up to eight devices on one bus.
Internally, it features a 256-page × 32-byte memory architecture, self-timed write cycles ≤5 ms, hardware write protection via dedicated WP pin, and Power-on Reset (POR) circuitry ensuring reliable initialization at VCC ≥1.5 V with tPUP ≥100 µs delay before command acceptance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 64 Kbit (8,192 × 8 bits), mapped as 256 pages of 32 bytes - enables efficient partial-page writes without erasing full sectors. |
| VCC operating 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 shifting. |
| I²C speed modes | 100 kHz (1.7–5.5 V), 400 kHz (1.7–5.5 V), 1 MHz (2.5–5.5 V) - allows dynamic bus speed selection based on system voltage and timing margin. |
| Write endurance | 1,000,000 cycles - ensures long-term reliability in firmware update logging or parameter tuning applications. |
| Data retention | 100 years at 55°C - guarantees persistent storage integrity across product lifetime under industrial thermal stress. |
| Standby current | ≤6 µA at 5.0 V - minimizes quiescent power draw in battery-backed or energy-harvesting systems. |
| Write-protect function | Dedicated WP pin inhibits all writes when pulled high to VCC - provides hardware-level security against accidental overwrites. |
Pinout & Package
AT24C64D-MAHM-E is supplied in an 8-pad XDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch), with exposed pad optionally connected to GND. Pin functions are identical across SOIC, TSSOP, UDFN, XDFN, and VFBGA variants per Microchip DS20005937C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device address input | Hardwired to GND or VCC to configure 3-bit hardware address; enables up to eight devices on same I²C bus. |
| A1 | Device address input | Second bit of 3-bit hardware address; must be externally biased - internal pull-down disengages above ~0.5×VCC. |
| A2 | Device address input | Third bit of 3-bit hardware address; floating state defaults to logic low but capacitive coupling risk mandates fixed bias. |
| GND | Ground reference | System ground connection; required for stable operation and ESD path - exposed pad may be tied to GND for thermal/mechanical enhancement. |
| SDA | Serial data I/O | Open-drain bidirectional line; requires external pull-up resistor ≤10 kΩ; latched on SCL rising edge, output on falling edge. |
| SCL | Serial clock input | Input-only clock line; must be pulled high externally; controls data sampling timing and bus arbitration. |
| WP | Write-protect control | Active-high hardware lock: tied to VCC disables all writes; floating defaults to GND (write enabled) but fixed bias strongly recommended. |
| VCC | Power supply | 1.7–5.5 V supply input; slew rate ≤0.1 V/µs required during power-up; POR activates at VPOR ≤1.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte page write mode | Enables partial-page writes without erasing adjacent bytes - reduces write latency and extends EEPROM lifespan in incremental data logging. |
| Schmitt-triggered, filtered inputs | Suppresses bus noise and spike-induced false starts/stops - improves robustness in electrically noisy industrial environments. |
| Self-timed write cycle | Maximum 5 ms duration with no host polling overhead - simplifies firmware design and avoids blocking CPU during write operations. |
| ESD protection >4,000 V | Meets HBM Class 3A requirements - eliminates need for external TVS diodes in most board-level ESD scenarios. |
| Green packaging | Lead-free, halide-free, RoHS-compliant construction - satisfies global environmental compliance mandates without derating. |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and linearization tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding calibrated parameters accessed at boot via I²C by MCU firmware. Use Value: Eliminates need for external trimming components and enables field recalibration without hardware modification. | Use Scenario: Retaining user-defined settings (network IP, display brightness, alarm thresholds) across power cycles in smart HVAC controllers. IC Role / Device Role / Timing Role: Persistent parameter store accessed asynchronously during runtime or at startup via standard I²C read/write sequences. Use Value: Supports zero-battery backup design while maintaining full configurability and firmware upgrade resilience. |
| Power Management Unit (PMU) | Firmware Update Logging |
Use Scenario: Recording fault history (overvoltage events, thermal shutdowns, brownout counts) in telecom DC-DC modules for predictive maintenance. IC Role / Device Role / Timing Role: Event-logging buffer written in atomic 32-byte page writes triggered by PMU interrupt signals. Use Value: Enables deterministic write timing and wear-leveling across 1M-cycle endurance - critical for mission-critical diagnostics. | Use Scenario: Tracking version stamps, CRC checksums, and rollback pointers during OTA firmware updates in IoT edge gateways. IC Role / Device Role / Timing Role: Atomic metadata repository updated only during verified firmware commit phases to prevent corruption on power loss. Use Value: Guarantees safe dual-bank update schemes with <5 ms write latency and 100-year data retention at elevated junction temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C64D-SSHM-T | Same die, 8-lead SOIC package (5.0 mm × 4.4 mm); higher thermal resistance; no exposed pad. | Preferred where board space allows larger footprint and thermal dissipation is not constrained. | Select for legacy SOIC layouts or prototyping with through-hole adapters; verify PCB land pattern compatibility. |
| M24C64-WMN6TP | STMicroelectronics 64-Kbit I²C EEPROM; supports 1 MHz only at 2.5–5.5 V; WP pin active-low; different device address map (1010xxx0/1). | Requires firmware address reconfiguration and WP logic inversion; identical endurance/retention specs. | Choose when sourcing diversification is required and I²C bus timing margins accommodate minor AC parameter variances. |
Compared with AT24C64D-SSHM-T, the AT24C64D-MAHM-E offers superior thermal performance and smaller footprint in XDFN, while M24C64-WMN6TP demands software adaptation for address and WP polarity but delivers equivalent nonvolatile storage reliability.
Availability
AT24C64D-MAHM-E is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and power management unit applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT24C64D-MAHM-E 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, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The AT24C64D-MAHM-E belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for low-voltage, low-power, and high-reliability nonvolatile data storage in space-constrained industrial and automotive-qualified systems.
FAQ
What is the maximum I²C clock frequency supported by AT24C64D-MAHM-E?
The AT24C64D-MAHM-E supports 100 kHz Standard Mode across 1.7–5.5 V, 400 kHz Fast Mode across 1.7–5.5 V, and 1 MHz Fast Mode Plus only when VCC is 2.5–5.5 V. This graded speed support ensures interoperability with legacy and high-speed I²C masters while maintaining signal integrity at lower voltages.
Does AT24C64D-MAHM-E require external pull-up resistors on SDA and SCL lines?
Yes, AT24C64D-MAHM-E 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 values of 10 kΩ for SDA and recommends pull-up strength aligned with bus capacitance and target clock speed - e.g., 4 kΩ for 400 kHz operation.
How does the write-protect (WP) pin function on AT24C64D-MAHM-E?
On AT24C64D-MAHM-E, the WP pin is active-high: when tied to VCC, it disables all write operations to the entire memory array; when tied to GND, normal writes are permitted. If left floating, WP defaults to GND due to internal pull-down, but Microchip strongly recommends hardwiring it to avoid noise-induced protection failures.
What is the memory organization of AT24C64D-MAHM-E?
The AT24C64D-MAHM-E organizes its 64 Kbit capacity as 8,192 words of 8 bits each, physically structured as 256 pages × 32 bytes. This layout enables efficient 32-byte page writes and supports random/sequential reads across the full address space using two-byte word addressing.
Is AT24C64D-MAHM-E compatible with other AT24Cxx devices on the same I²C bus?
Yes, AT24C64D-MAHM-E uses the standard I²C device type identifier '1010' and supports hardware address inputs A0–A2, allowing up to eight AT24Cxx-family devices (including AT24C01 through AT24C512) to coexist on one bus - provided their A0–A2 configurations yield unique 7-bit addresses per Microchip's addressing scheme.
AT24C64D-MAHM-E 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:
- 450 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-E FAQ
1.How can I place an order for AT24C64D-MAHM-E through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C64D-MAHM-E 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-E reliable?
The price and inventory of AT24C64D-MAHM-E 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-E is usually 5 days.
3.What payment methods are accepted for AT24C64D-MAHM-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C64D-MAHM-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C64D-MAHM-E?
AT24C64D-MAHM-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C64D-MAHM-E 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-E?
For technical support, including AT24C64D-MAHM-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C64D-MAHM-E requirements.
6.How does Aetrix verify that AT24C64D-MAHM-E is sourced from the original manufacturer or authorized distributors?
All AT24C64D-MAHM-E 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-E meets industry standards.
7.What is the process for return or replacement of AT24C64D-MAHM-E?
All AT24C64D-MAHM-E units undergo pre-shipment inspection (PSI). If there is an issue with AT24C64D-MAHM-E, 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-E part is unused and in its original packaging.
Return procedure for AT24C64D-MAHM-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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