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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology AT24C64D-MAPD-T

Name: AT24C64D-MAPD-T
Brand: Microchip Technology
SKU: AT24C64D-MAPD-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT24C64D-MAPD-T

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-UFDFN Exposed Pad

Datasheet:: AT24C64D-MAPD-T.pdf

Description:: IC EEPROM 64KBIT I2C 8UDFN

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Product details

Overview

AT24C64D-MAPD-T from Microchip Technology is a 64-Kbit (8,192 × 8) I²C-compatible automotive-grade serial EEPROM with AEC-Q100 Grade 1 qualification (-40°C to +125°C), 1.7V–5.5V supply range, and hardware write-protection via WP pin - deployed in engine control units, ADAS sensor modules, and battery management systems for nonvolatile configuration storage.

For engineers reviewing the AT24C64D-MAPD-T datasheet, AT24C64D-MAPD-T pinout, AT24C64D-MAPD-T application, or AT24C64D-MAPD-T equivalent, key selection criteria include I²C fast-mode (400 kHz) timing compliance, 32-byte page write capability with ≤5 ms self-timed write cycle, 1,000,000 write endurance, and SOIC-8 package compatibility with legacy board layouts.

Technical Context

The AT24C64D-MAPD-T operates as an I²C slave device with fixed 7-bit device address prefix 1010b and three programmable address bits (A0–A2), enabling up to eight devices on one bus. It implements Schmitt-triggered, filtered SDA/SCL inputs for robust noise immunity in automotive environments.

Internally organized as 256 pages of 32 bytes each, it supports byte-write, page-write (with partial-page capability), current-address read, random read, and sequential read modes. Write protection is enforced by the WP pin tied to VCC (full-array lock) or GND (normal operation), with internal pull-downs ensuring defined state when floating.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	64 Kbit (8,192 × 8 bits); sufficient for firmware patch storage, calibration tables, and VIN/ECU ID logging in Tier-1 modules.
Interface	I²C two-wire (SCL/SDA); supports Standard mode (100 kHz) and Fast mode (400 kHz) - compatible with most microcontroller I²C peripherals without protocol translation.
Supply voltage	1.7V to 5.5V (Grade 3) / 2.5V to 5.5V (Grade 1); enables direct connection to 3.3V or 5V MCU rails without level-shifting in under-hood electronics.
Write endurance	1,000,000 cycles; supports frequent recalibration updates in adaptive cruise control or thermal management subsystems over full vehicle lifetime.
Data retention	100 years at 55°C; ensures long-term integrity of safety-critical configuration data across 15+ year automotive service life.
Operating temperature	-40°C to +125°C (AEC-Q100 Grade 1); qualified for placement near powertrain ECUs, inverters, and radar front-ends without derating.
Active/standby current	≤3.0 mA active (5V, 400 kHz write), ≤6.0 μA standby (5V); minimizes quiescent load in always-on domains like telematics gateways.

Pinout & Package

AT24C64D-MAPD-T is supplied in an 8-lead SOIC package (body width 3.9 mm, lead pitch 1.27 mm), pin-compatible with industry-standard EEPROM footprints and reflow-solderable per JEDEC J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
A0	Device address input	Hardwired to GND/VCC to set LSB of 7-bit I²C slave address; enables multi-device bus topology with up to eight AT24C64D-MAPD-T units sharing one I²C bus.
A1	Device address input	Second bit of hardware slave address; combined with A0/A2, defines unique I²C address within 1010xxxR/W format (xxx = A2,A1,A0).
A2	Device address input	MSB of hardware slave address; allows differentiation between multiple EEPROMs in distributed ECU architectures (e.g., body control + powertrain modules).
GND	Ground reference	System return path for VCC and I/O; must be low-impedance connection to minimize ground bounce during write cycles.
SDA	Serial data bidirectional I/O	Open-drain line requiring external pull-up (≤10 kΩ); transmits ACK/NACK, carries command/data, and supports wire-OR with other I²C slaves.
SCL	Serial clock input	Master-generated clock; rising edge latches input data, falling edge outputs data - timing must meet tLOW/tHIGH minima per I²C Fast mode spec.
WP	Hardware write-protect	Pulled high to VCC to disable all writes (full-array lock); pulled low to enable writes - prevents corruption during power transients or firmware update errors.
VCC	Power supply	1.7–5.5V input; includes internal POR circuit requiring ≥100 µs stable VCC before first command; slew rate ≤0.1 V/µs recommended.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for -40°C to +125°C operation with extended reliability testing - meets functional safety requirements for ASIL-B capable systems without additional screening.
32-byte page write with partial-page support	Enables efficient firmware fragment updates (e.g., single parameter tuning) without erasing full 32-byte boundary - reduces write latency and wear leveling overhead.
Schmitt-triggered, filtered I/O	Suppresses EMI-induced glitches on SDA/SCL in noisy automotive harnesses - eliminates need for external RC filters or ferrites in most implementations.
Ultra-low standby current (≤6 μA)	Permits permanent connection to always-on battery rail in gateway ECUs while contributing negligible drain - extends sleep-mode battery life in parked vehicle scenarios.
Green RoHS-compliant packaging	Lead-free, halide-free SOIC-8 meets ELV Directive and OEM substance restrictions - supports global vehicle homologation without material waivers.

Applications

Engine Control Unit (ECU)	Advanced Driver Assistance Systems (ADAS)
Use Scenario: Storing real-time calibration maps (fuel injection timing, spark advance) that adapt to aging sensors and environmental conditions. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via I²C during boot and runtime re-mapping; WP pin asserted during normal operation to prevent accidental overwrite. Use Value: Enables field-upgradable calibration without reflashing main MCU flash - reduces service time and avoids ECU reprogramming tools at dealership.	Use Scenario: Retaining radar sensor alignment offsets and camera lens distortion coefficients after power cycling in lane-keeping assist modules. IC Role / Device Role / Timing Role: Persistent parameter store interfaced to SoC's I²C controller; leverages 400 kHz Fast mode for sub-100 ms boot-time loading of correction data. Use Value: Eliminates manual recalibration after battery disconnect - maintains ADAS functionality immediately on vehicle restart.
Battery Management System (BMS)	Telematics Control Unit (TCU)
Use Scenario: Logging cell voltage imbalance history and thermal runaway event timestamps for predictive maintenance in EV traction batteries. IC Role / Device Role / Timing Role: High-endurance data logger using page-write mode to append timestamped records; WP pin controlled by BMS MCU during critical fault conditions. Use Value: Survives >1M write cycles over 10-year pack life - avoids premature EEPROM exhaustion in high-frequency monitoring applications.	Use Scenario: Storing SIM card credentials, OTA update metadata, and vehicle identification numbers (VIN) in connected car gateways. IC Role / Device Role / Timing Role: Secure boot-time configuration store; accessed early in power-on sequence before secure enclave initialization. Use Value: Provides tamper-resistant, low-power storage for identity-critical data - complements hardware security module (HSM) without adding latency.

Engine Control Unit (ECU)

Advanced Driver Assistance Systems (ADAS)

Use Scenario: Storing real-time calibration maps (fuel injection timing, spark advance) that adapt to aging sensors and environmental conditions.

IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed via I²C during boot and runtime re-mapping; WP pin asserted during normal operation to prevent accidental overwrite.

Use Value: Enables field-upgradable calibration without reflashing main MCU flash - reduces service time and avoids ECU reprogramming tools at dealership.

Use Scenario: Retaining radar sensor alignment offsets and camera lens distortion coefficients after power cycling in lane-keeping assist modules.

IC Role / Device Role / Timing Role: Persistent parameter store interfaced to SoC's I²C controller; leverages 400 kHz Fast mode for sub-100 ms boot-time loading of correction data.

Use Value: Eliminates manual recalibration after battery disconnect - maintains ADAS functionality immediately on vehicle restart.

Battery Management System (BMS)

Telematics Control Unit (TCU)

Use Scenario: Logging cell voltage imbalance history and thermal runaway event timestamps for predictive maintenance in EV traction batteries.

IC Role / Device Role / Timing Role: High-endurance data logger using page-write mode to append timestamped records; WP pin controlled by BMS MCU during critical fault conditions.

Use Value: Survives >1M write cycles over 10-year pack life - avoids premature EEPROM exhaustion in high-frequency monitoring applications.

Use Scenario: Storing SIM card credentials, OTA update metadata, and vehicle identification numbers (VIN) in connected car gateways.

IC Role / Device Role / Timing Role: Secure boot-time configuration store; accessed early in power-on sequence before secure enclave initialization.

Use Value: Provides tamper-resistant, low-power storage for identity-critical data - complements hardware security module (HSM) without adding latency.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ST M24C64-WMN6TP	Same 64-Kbit capacity, I²C Fast mode, and SOIC-8 package; AEC-Q100 Grade 2 (-40°C to +105°C), not Grade 1.	Limited to under-dash modules (e.g., infotainment) where ambient temperature does not exceed +105°C.	Select when Grade 1 qualification is unnecessary and ST's dual-supply (1.7–5.5V) and enhanced ESD (>4 kV) align with system-level stress testing.
ON Semiconductor CAT24C64WI-GT3	Identical memory organization and pinout; AEC-Q100 Grade 1, but max write cycle time is 10 ms vs. 5 ms for AT24C64D-MAPD-T.	Acceptable for non-time-critical parameter storage (e.g., HVAC settings), but may delay boot sequences in safety-critical ECUs.	Prefer when cost sensitivity outweighs 5-ms write latency requirement and ON Semi's longer production lifecycle offers better long-term supply assurance.

Compared with ST M24C64-WMN6TP and CAT24C64WI-GT3, the AT24C64D-MAPD-T delivers the shortest guaranteed write cycle (5 ms), full Grade 1 thermal range, and Microchip's validated automotive qualification package - making it optimal for powertrain and chassis domain controllers where timing predictability and extreme temperature resilience are mandatory.

Availability

AT24C64D-MAPD-T is available at Aetrix Electronics and suitable for engine control units, ADAS sensor modules, and battery management systems requiring stable component supply across extended automotive production lifecycles.

Supply support for AT24C64D-MAPD-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 for automotive, industrial, and communications markets.

The AT24C64D-MAPD-T belongs to Microchip's AEC-Q100-qualified serial EEPROM product line, engineered specifically for reliable nonvolatile data storage in harsh automotive environments with emphasis on low-voltage operation, noise immunity, and long-term data integrity.

FAQ

What is the maximum I²C clock frequency supported by the AT24C64D-MAPD-T?

The AT24C64D-MAPD-T supports I²C Fast mode up to 400 kHz, with AC timing parameters (tLOW, tHIGH, tSU.STA, etc.) fully characterized and guaranteed across its operating voltage and temperature range. This enables high-throughput configuration reads in time-sensitive automotive boot sequences without protocol arbitration delays.

Does the AT24C64D-MAPD-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C64D-MAPD-T requires external pull-up resistors on both SDA and SCL lines due to its open-drain I/O architecture. Microchip specifies maximum values of 10 kΩ for reliable noise margin and rise time compliance - typical designs use 2.2–4.7 kΩ resistors tied to the same VCC rail as the AT24C64D-MAPD-T.

How does the write-protect (WP) pin function on the AT24C64D-MAPD-T?

When the WP pin of the AT24C64D-MAPD-T is driven high to VCC, all write operations (byte, page, and erase) to the entire 64-Kbit array are inhibited. When pulled low to GND, normal write functionality is enabled. Internal pull-downs ensure safe default behavior if the pin is left unconnected, though Microchip recommends hardwiring for deterministic operation.

What is the guaranteed write endurance and data retention for the AT24C64D-MAPD-T?

The AT24C64D-MAPD-T is specified for 1,000,000 write cycles and 100 years of data retention at 55°C. These figures are derived from accelerated qualification testing per AEC-Q100 standards and represent minimum guaranteed performance - actual field life in automotive applications typically exceeds these values significantly under nominal operating conditions.

Is the AT24C64D-MAPD-T pin-compatible with earlier AT24C64 variants in SOIC-8 packages?

Yes, the AT24C64D-MAPD-T maintains identical pinout, electrical characteristics, and memory organization as legacy AT24C64B/C SOIC-8 variants. It is a drop-in replacement with enhanced AEC-Q100 Grade 1 qualification, improved ESD robustness (>4 kV), and tighter DC/AC parameter tolerances - no PCB or firmware changes required for migration.

AT24C64D-MAPD-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:: 400 kHz

Write Cycle Time - Word, Page:: 5ms

Access Time:: 900 ns

Voltage - Supply:: 2.5V ~ 5.5V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 8-UDFN (2x3)

AT24C64D-MAPD-T FAQ

1.How can I place an order for AT24C64D-MAPD-T through Aetrix?

Please submit a Request for Quotation (RFQ) for AT24C64D-MAPD-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-MAPD-T reliable?

The price and inventory of AT24C64D-MAPD-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-MAPD-T is usually 5 days.

3.What payment methods are accepted for AT24C64D-MAPD-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C64D-MAPD-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT24C64D-MAPD-T?

AT24C64D-MAPD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT24C64D-MAPD-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-MAPD-T?

For technical support, including AT24C64D-MAPD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C64D-MAPD-T requirements.

6.How does Aetrix verify that AT24C64D-MAPD-T is sourced from the original manufacturer or authorized distributors?

All AT24C64D-MAPD-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-MAPD-T meets industry standards.

7.What is the process for return or replacement of AT24C64D-MAPD-T?

All AT24C64D-MAPD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C64D-MAPD-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-MAPD-T part is unused and in its original packaging.

Return procedure for AT24C64D-MAPD-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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