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Microchip Technology AT24C64D-XPD-T
- Part No.:
- AT24C64D-XPD-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C64D-XPD-T.pdf
- Description:
- IC EEPROM 64KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,547
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Product details
Overview
AT24C64D-XPD-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. It supports 400 kHz Fast-mode I²C communication, 32-byte page writes, and delivers 1M write cycles with 100-year data retention - deployed in engine control units, ADAS sensor calibration storage, and infotainment configuration memory.
For engineers reviewing the AT24C64D-XPD-T datasheet, AT24C64D-XPD-T pinout, AT24C64D-XPD-T application, or AT24C64D-XPD-T equivalent, key selection criteria include automotive temperature compliance, I²C bus timing compatibility (tLOW/tHIGH at 400 kHz), WP pin behavior under floating conditions, and SOIC-8 package mechanical fit for space-constrained PCB layouts.
Technical Context
The AT24C64D-XPD-T operates as an I²C slave device with fixed 7-bit address prefix 1010b and three programmable address bits (A0–A2), enabling up to eight devices on one bus. Its internal architecture includes a 256-page × 32-byte memory array, high-voltage generation circuitry for EEPROM programming, and integrated Schmitt-trigger inputs with noise filtering on SDA/SCL.
Write operations use self-timed internal cycles (≤5 ms max), support partial-page writes, and require ACK polling for completion detection. Standby current is specified at 6 μA max (VCC = 5.0 V), and the device incorporates Power-on Reset (POR) with 100 µs tPUP delay before command acceptance after stable VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8,192 × 8 bits), organized as 256 pages of 32 bytes - enables efficient firmware parameter storage with minimal address overhead. |
| Interface | I²C two-wire serial (Standard mode 100 kHz / 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) - supports wide-input automotive power rails including post-regulated 3.3V and unregulated 5V domains. |
| Operating Temp | -40°C to +125°C (AEC-Q100 Grade 1) - qualified for under-hood ECUs and transmission control modules requiring extended thermal robustness. |
| Write Endurance | 1,000,000 cycles - sufficient for logging critical vehicle event data (e.g., crash triggers, diagnostic snapshots) over full vehicle lifetime. |
| Data Retention | 100 years at 55°C - ensures long-term calibration data integrity across vehicle service life without refresh mechanisms. |
| Standby Current | 6 μA maximum at VCC = 5.0 V - minimizes quiescent power draw in always-on vehicle networks (e.g., CAN wake-up circuits). |
Pinout & Package
AT24C64D-XPD-T is supplied in an 8-lead SOIC package (XPD suffix per Microchip part numbering). Pin functions are validated per DS20006271A-page 4–5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware Address Input | Configures LSB of 7-bit I²C slave address; pulled down internally if floating - requires explicit tie-high/tie-low for deterministic multi-device addressing. |
| A1 | Hardware Address Input | Configures middle bit of slave address; same internal pull-down behavior as A0 - critical for avoiding bus contention in multi-EEPROM systems. |
| A2 | Hardware Address Input | Configures MSB of slave address; enables up to eight unique addresses (1010xxxR/W) on shared I²C bus. |
| GND | Ground Reference | System ground return path; must be low-impedance connection to avoid noise coupling into SDA/SCL timing margins. |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up resistor ≤10 kΩ - shares bus with other open-drain devices (e.g., sensors, MCUs). |
| SCL | Serial Clock Input | Master-generated clock; rising edge latches input, falling edge outputs data - timing parameters (tLOW/tHIGH) constrain maximum bus speed. |
| WP | Write-Protect Control | Active-high hardware lock: tied to VCC blocks all writes; tied to GND enables full memory access - prevents corruption during power transients. |
| VCC | Power Supply | 1.7–5.5V operation; must ramp monotonically at ≤0.1 V/µs - improper slew rate causes POR failure and undefined state. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive AEC-Q100 Grade 1 Qualification | Validated for -40°C to +125°C operation with stress testing per automotive reliability standards - eliminates need for additional qualification in Tier 1 ECU designs. |
| Hardware Write Protection (WP Pin) | Physically disables write commands when driven high - prevents accidental overwrites during system boot or brown-out events without software intervention. |
| 32-Byte Page Write Mode | Enables burst programming of up to 32 bytes per I²C transaction - reduces bus occupancy time by >75% vs. byte-write for configuration block updates. |
| Schmitt Trigger Inputs with Filtering | Suppresses noise spikes <100 ns on SDA/SCL - improves I²C robustness in electrically noisy automotive environments (e.g., near ignition systems). |
| Ultra-Low Standby Current (6 μA) | Minimizes battery drain in always-on vehicle subsystems (e.g., telematics, keyless entry) - extends backup power runtime by orders of magnitude. |
Applications
| Engine Control Unit (ECU) Calibration Storage | Advanced Driver Assistance Systems (ADAS) Sensor Offset Memory |
|---|---|
|
Use Scenario: Storing fuel map coefficients, spark timing tables, and OBD-II diagnostic thresholds that must survive vehicle power cycles and reprogramming events. IC Role / Device Role / Timing Role: Nonvolatile configuration register - retains values across ignition-off periods and supports field updates via bootloader over CAN/I²C gateway. Use Value: Enables zero-latency startup with validated calibration data; 100-year retention ensures no recalibration needed over vehicle lifetime. |
Use Scenario: Holding per-sensor factory-trimmed offset/gain values for radar, camera, and ultrasonic modules subject to thermal drift compensation. IC Role / Device Role / Timing Role: Trim-data repository - accessed at system boot to initialize sensor signal chains before closed-loop control activation. Use Value: Eliminates need for external calibration jigs during assembly; Grade 1 temp rating guarantees accuracy across full ambient operating range. |
| Infotainment System UI Configuration | Body Control Module (BCM) Personalization Settings |
|
Use Scenario: Saving user preferences (display brightness, audio EQ, language, seat position) that persist through firmware upgrades and battery disconnection. IC Role / Device Role / Timing Role: Persistent settings manager - written during UI interaction, read at GUI initialization; uses I²C Fast-mode for sub-10ms load times. Use Value: Delivers seamless user experience with instant recall of preferences; 1M endurance supports daily adjustments over 10+ years. |
Use Scenario: Storing door lock behavior, mirror fold/unfold logic, and interior lighting profiles customized per vehicle trim level or regional market. IC Role / Device Role / Timing Role: Feature enablement register - programmed once at final assembly, read at BCM power-up to configure peripheral drivers. Use Value: Reduces BOM variation across global platforms; WP pin prevents field corruption during service-mode diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics M24C64-WMN6TP | Same 64-Kbit I²C EEPROM, AEC-Q100 Grade 1, but uses different WP polarity (active-low) and lacks internal address pin pull-downs. | Requires external pull-up resistors on A0–A2 and inverted WP logic design - increases component count and layout complexity. | Select when ST's qualification documentation or existing supply chain preference outweighs pinout compatibility. |
| ON Semiconductor CAT24C64WI-GT3 | 64-Kbit I²C EEPROM with identical SOIC-8 package and pinout, but rated only to +105°C (non-AEC-Q100) and higher standby current (10 μA). | Not qualified for under-hood deployment; suitable for cabin-mounted modules where ambient temperature stays below 85°C. | Choose for cost-sensitive non-automotive applications or secondary systems where full AEC-Q100 compliance is not mandated. |
Compared with AT24C64D-XPD-T, M24C64-WMN6TP demands board-level redesign for WP and address pin biasing, while CAT24C64WI-GT3 sacrifices automotive temperature margin and power efficiency - making AT24C64D-XPD-T the optimal choice for primary ECU and ADAS storage where Grade 1 reliability is mandatory.
Availability
AT24C64D-XPD-T is available at Aetrix Electronics and suitable for engine control units, ADAS sensor calibration systems, and infotainment configuration storage requiring stable component supply across automotive production lifecycles.
Supply support for AT24C64D-XPD-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, with ISO/TS 16949-certified automotive manufacturing processes.
The AT24C64D-XPD-T belongs to Microchip's automotive-qualified serial EEPROM product line, designed specifically for reliable nonvolatile data storage in harsh-temperature vehicle subsystems where firmware integrity and long-term data retention are critical.
FAQ
What is the maximum I²C clock frequency supported by the AT24C64D-XPD-T?
The AT24C64D-XPD-T supports I²C Fast mode up to 400 kHz, with guaranteed AC timing parameters including tLOW ≥1200 ns and tHIGH ≥600 ns at VCC = 1.7V–5.5V. Standard mode (100 kHz) is also fully supported. Exceeding 400 kHz violates the device specification and may cause communication failures or data corruption during read/write operations.
Does the AT24C64D-XPD-T require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C64D-XPD-T requires external pull-up resistors on both SDA and SCL lines because these pins are open-drain. Microchip specifies a maximum value of 10 kΩ for the pull-up resistor to ensure proper rise time (tR ≤300 ns at 400 kHz). The exact resistor value must be selected based on bus capacitance and target clock speed per Figure 3-1 in DS20006271A.
How does the Write-Protect (WP) pin function on the AT24C64D-XPD-T?
On the AT24C64D-XPD-T, the WP pin is active-high: when tied to VCC, it inhibits all write operations to the entire memory array; when tied to GND, normal write functionality is enabled. If left floating, the pin is internally pulled down to GND, but Microchip recommends hard-wiring WP to a defined voltage to prevent noise-induced protection glitches in automotive environments.
What is the memory organization of the AT24C64D-XPD-T?
The AT24C64D-XPD-T organizes its 64 Kbit capacity as 8,192 words of 8 bits each, segmented into 256 pages of 32 bytes. This structure enables efficient page-write operations - writing up to 32 contiguous bytes in a single I²C transaction - and supports both random and sequential read modes without address wraparound limitations.
Is the AT24C64D-XPD-T compatible with standard I²C protocol implementations?
Yes, the AT24C64D-XPD-T implements a fully compliant I²C slave interface with standard Start/Stop conditions, ACK/NACK handshaking, and 7-bit addressing (1010xxxR/W format). It supports repeated Start conditions and adheres to I²C specification timing requirements for both Standard and Fast modes, ensuring interoperability with any I²C master controller.
AT24C64D-XPD-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- 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-TSSOP
AT24C64D-XPD-T FAQ
1.How can I place an order for AT24C64D-XPD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C64D-XPD-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-XPD-T reliable?
The price and inventory of AT24C64D-XPD-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-XPD-T is usually 5 days.
3.What payment methods are accepted for AT24C64D-XPD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C64D-XPD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C64D-XPD-T?
AT24C64D-XPD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C64D-XPD-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-XPD-T?
For technical support, including AT24C64D-XPD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C64D-XPD-T requirements.
6.How does Aetrix verify that AT24C64D-XPD-T is sourced from the original manufacturer or authorized distributors?
All AT24C64D-XPD-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-XPD-T meets industry standards.
7.What is the process for return or replacement of AT24C64D-XPD-T?
All AT24C64D-XPD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C64D-XPD-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-XPD-T part is unused and in its original packaging.
Return procedure for AT24C64D-XPD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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