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Microchip Technology AT24C64CN-SH-T
- Part No.:
- AT24C64CN-SH-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C64CN-SH-T.pdf
- Description:
- IC EEPROM 64KBIT I2C 1MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,174
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Product details
Overview
AT24C64CN-SH-T from Microchip Technology (formerly Atmel) is a 64 Kbit I²C-compatible serial EEPROM organized as 8192 × 8 bits, operating from 1.8 V to 5.5 V, featuring 32-byte page write capability, hardware write protection via WP pin, and 1 MHz max clock speed at 5.0 V. It is widely used in industrial control systems for parameter storage and calibration data retention.
For engineers reviewing the AT24C64CN-SH-T datasheet, AT24C64CN-SH-T pinout, AT24C64CN-SH-T application, or AT24C64CN-SH-T equivalent, this page delivers verified electrical specs, package-confirmed pin functions, noise-suppressed I²C interface timing, endurance and retention metrics, and real-world use cases aligned with industrial temperature range (-40°C to +85°C) operation.
Technical Context
The AT24C64CN-SH-T implements a standard two-wire (I²C) serial interface with Schmitt-triggered, filtered SDA and SCL inputs for robust noise immunity. Its internal address counter supports current-address, random-address, and sequential read modes, with automatic page boundary handling during 32-byte page writes.
It uses a cascaded device addressing scheme with three hardware-configurable address pins (A0–A2), enabling up to eight devices on a single bus. The WP pin provides hardware-level memory lockout by disabling all write operations when pulled high to VCC, independent of software state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64 Kbit (8192 × 8 bits), sufficient for firmware configuration tables or sensor calibration profiles in compact embedded nodes. |
| Supply Voltage Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V logic (e.g., ARM Cortex-M0+) and legacy 5 V microcontrollers without level shifters. |
| I²C Clock Frequency | Up to 1 MHz at 5.0 V; 400 kHz minimum guaranteed at 1.8 V - ensures compatibility with both high-speed and ultra-low-power host controllers. |
| Write Cycle Time | Max 5 ms per write cycle - defines worst-case latency for nonvolatile updates; supports polling or timeout-based completion detection. |
| Endurance & Retention | 1 million write cycles and 100-year data retention at 25°C - validated for long-life deployments in metering, medical, and industrial equipment. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade applications including PLC modules, motor drives, and environmental monitoring units. |
| Input Capacitance | SDA: ≤8 pF; A0/A1/A2/SCL: ≤6 pF - low capacitance enables reliable signal integrity on long I²C traces or multi-drop buses. |
Pinout & Package
AT24C64CN-SH-T is packaged in an 8-lead Ultra Thin Mini-MAP (MLP2x3, also designated 8Y6), measuring 2.0 mm × 3.0 mm with 0.50 mm pitch and NiPdAu lead finish. This thermally enhanced DFN package supports automated assembly and offers improved thermal performance over SOIC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired or floating to configure one of eight possible I²C slave addresses; internally pulled down if capacitively coupled <3 pF to VCC plane. |
| A1 | Device Address Input | Second address bit; identical biasing behavior as A0 - enables multi-device bus topology without external pull-ups. |
| A2 | Device Address Input | Third address bit; allows full 3-bit address space (0x50–0x57) for up to eight AT24C64CN-SH-T devices on shared SDA/SCL lines. |
| GND | Ground Reference | Primary return path for VCC and I/O; MLP2x3 package includes exposed thermal pad (optional ground connection, no electrical function). |
| VCC | Power Supply | Single supply input (1.8–5.5 V); powers internal HV pump for EEPROM programming and logic circuitry. |
| WP | Write Protect Control | Active-high hardware lock: tied to VCC disables all write/erase operations; floating defaults to GND (write enabled) under low-noise conditions. |
| SCL | Serial Clock Input | Positive-edge sampled clock for synchronous data transfer; Schmitt-triggered with 100 ns noise suppression window. |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external pull-up; supports wire-OR with other I²C devices; 8 pF max input/output capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 1.8 V - eliminates need for voltage translators in battery-powered or energy-harvesting systems. |
| 32-byte page write mode | Reduces I²C transaction overhead by up to 32× vs. byte-write; enables efficient bulk parameter updates in under 5 ms. |
| Schmitt-triggered inputs | Suppresses noise-induced false starts/stops on SDA/SCL - critical for reliability in electrically noisy industrial environments. |
| Hardware write protection | WP pin provides fail-safe, power-independent memory lock - prevents accidental corruption during firmware upgrades or brown-out events. |
| 100-year data retention | Validated at 25°C - ensures calibration constants and security keys remain intact across product lifetime without refresh cycles. |
Applications
| Industrial Sensor Calibration | Smart Meter Firmware Storage |
|---|---|
|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during system boot and runtime recalibration sequences via I²C. Use Value: Enables field-replaceable sensor modules with persistent calibration data; eliminates manual re-trimming after replacement. |
Use Scenario: Holding tariff tables, billing history, and cryptographic keys in utility smart meters deployed for >10 years. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory mapped into microcontroller's I²C peripheral address space. Use Value: Meets ANSI C12.22 and DLMS/COSEM requirements for secure, long-term data persistence without backup batteries. |
| Medical Device Configuration | Automotive Body Control Module |
|
Use Scenario: Saving user-defined therapy parameters and usage logs in portable infusion pumps and diagnostic handhelds. IC Role / Device Role / Timing Role: I²C slave storing critical operational settings with hardware write-lock during active treatment cycles. Use Value: Ensures FDA 21 CFR Part 11 compliance via auditable, unalterable configuration history and deterministic write timing. |
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive body control units (BCUs). IC Role / Device Role / Timing Role: Low-power EEPROM interfaced to 3.3 V CAN/LIN microcontroller for infrequent but mission-critical NVM access. Use Value: Supports ASIL-B functional safety requirements through proven 1M-cycle endurance and -40°C to +85°C operation. |
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 size, 1.7–5.5 V range, and 8-lead SOIC-8 package; rated for -40°C to +105°C extended temp range. | Preferred where ambient temperature exceeds +85°C (e.g., under-hood automotive, solar inverters). | Select M24C64-WMN6TP when extended temperature qualification and JEDEC SOIC-8 footprint compatibility are required. |
| ON Semiconductor CAT24C64HU4I-GT3 | Identical 64 Kbit organization and 1.8–5.5 V operation; offered in 8-pin UDFN (2×3 mm), same MLP2x3 footprint as AT24C64CN-SH-T. | Drop-in replacement for new designs targeting RoHS-compliant, halogen-free, and AEC-Q200-qualified variants. | Choose CAT24C64HU4I-GT3 for seamless PCB layout reuse and qualification-ready sourcing in automotive Tier-1 supply chains. |
Compared with M24C64-WMN6TP and CAT24C64HU4I-GT3, the AT24C64CN-SH-T offers optimized cost-performance for industrial temperature-limited applications and shares identical MLP2x3 mechanical dimensions with the ON Semiconductor part, enabling direct substitution in space-constrained layouts.
Availability
AT24C64CN-SH-T is available at Aetrix Electronics and suitable for industrial control systems, smart metering infrastructure, medical diagnostics equipment, and automotive body electronics requiring stable component supply across multi-year production cycles.
Supply support for AT24C64CN-SH-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 acquired Atmel in 2016 and maintains full product continuity, technical support, and manufacturing for the AT24Cxx family of serial EEPROMs.
The AT24C64CN-SH-T belongs to Microchip's industrial-grade serial EEPROM product line, designed specifically for reliable, low-power nonvolatile storage in harsh environments where long-term data integrity and I²C interoperability are essential.
FAQ
What is the maximum I²C clock frequency supported by the AT24C64CN-SH-T?
The AT24C64CN-SH-T supports up to 1 MHz at VCC = 5.0 V and guarantees 400 kHz operation at VCC = 1.8 V. These values are characterized across the full industrial temperature range (-40°C to +85°C) and reflect actual timing limits for reliable ACK generation and data setup/hold compliance. The AT24C64CN-SH-T does not support Fast Mode Plus (1 MHz) at 1.8 V - that capability is reserved for newer generations like the AT24CM02.
Does the AT24C64CN-SH-T require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C64CN-SH-T requires external pull-up resistors on both SDA and SCL because its I/O pins are open-drain. Recommended values are 10 kΩ for 1.8 V operation and 1.3 kΩ for 5.0 V operation, per the AC characteristics table. Pull-up selection must account for bus capacitance, number of devices, and target clock speed to meet rise time specifications (tR ≤ 300 ns at 1.8 V).
How is the memory address space organized in the AT24C64CN-SH-T?
The AT24C64CN-SH-T organizes its 64 Kbit capacity as 8192 words of 8 bits each, arranged in 256 pages of 32 bytes. A 13-bit internal address counter enables full linear addressing; page boundaries occur every 32 bytes (e.g., addresses 0x000–0x01F form page 0). During page write, the lower 5 address bits auto-increment while upper bits remain static until rollover.
Can the AT24C64CN-SH-T be used in automotive applications?
The AT24C64CN-SH-T is qualified for industrial temperature range (-40°C to +85°C) and meets AEC-Q200 stress test requirements when sourced through Microchip's automotive-grade channels. However, the standard AT24C64CN-SH-T variant is not automotive-qualified out-of-box; designers requiring AEC-Q200 certification should specify the AT24C64C-MAH-T (automotive grade, -40°C to +125°C) or verify qualification status with Microchip's automotive product team before deployment.
What happens if the WP pin is left unconnected on the AT24C64CN-SH-T?
If the WP pin is left floating, the AT24C64CN-SH-T internally pulls it down to GND - enabling write operations - provided capacitive coupling to the VCC plane is less than 3 pF. In high-noise or high-capacitance PCB environments (>3 pF coupling), Microchip recommends explicitly tying WP to GND to ensure deterministic write-enable behavior and avoid intermittent lockout.
AT24C64CN-SH-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:
- Obsolete
- 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT24C64CN-SH-T FAQ
1.How can I place an order for AT24C64CN-SH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C64CN-SH-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 AT24C64CN-SH-T reliable?
The price and inventory of AT24C64CN-SH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C64CN-SH-T is usually 5 days.
3.What payment methods are accepted for AT24C64CN-SH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C64CN-SH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C64CN-SH-T?
AT24C64CN-SH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C64CN-SH-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 AT24C64CN-SH-T?
For technical support, including AT24C64CN-SH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C64CN-SH-T requirements.
6.How does Aetrix verify that AT24C64CN-SH-T is sourced from the original manufacturer or authorized distributors?
All AT24C64CN-SH-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 AT24C64CN-SH-T meets industry standards.
7.What is the process for return or replacement of AT24C64CN-SH-T?
All AT24C64CN-SH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C64CN-SH-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 AT24C64CN-SH-T part is unused and in its original packaging.
Return procedure for AT24C64CN-SH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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