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Microchip Technology AT34C02N-10SI-2.7
- Part No.:
- AT34C02N-10SI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT34C02N-10SI-2.7.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,411
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Product details
Overview
AT34C02N-10SI-2.7 from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) serial EEPROM with permanent software write protection for the first 1K (00H–7FH), hardware write protection via WP pin, and 2-wire I²C-compatible interface. It operates from 2.7V to 5.5V, supports 400 kHz clock at 2.7V+, delivers 1 million write cycles, and is housed in an 8-lead JEDEC SOIC package. It is widely used in industrial control systems for storing calibration data, configuration parameters, and firmware revision flags.
For engineers reviewing the AT34C02N-10SI-2.7 datasheet, AT34C02N-10SI-2.7 pinout, AT34C02N-10SI-2.7 application, or AT34C02N-10SI-2.7 equivalent, key selection criteria include its dual write-protection architecture (software + hardware), guaranteed 100-year data retention, page-write capability (16-byte), Schmitt-trigger inputs for noise immunity, and automotive-grade temperature range support (-40°C to +85°C).
Technical Context
The AT34C02N-10SI-2.7 implements a true 2-wire serial interface compliant with I²C protocol timing: it accepts standard START/STOP conditions, supports bidirectional SDA with open-drain logic, and uses SCL for synchronous clocking. Its internal address counter enables current-address, random-address, and sequential read modes without external address latching.
Write protection is implemented at two independent levels: software-based (irreversible, protects 00H–7FH only) and hardware-based (WP pin-controlled, protects full 2K array). The device features internally timed 5 ms max write cycles, acknowledge polling support, and automatic address roll-over during page writes - all managed without host intervention beyond protocol signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2048 bits (256 words × 8 bits); sufficient for small configuration tables, sensor offsets, or boot-up flags in space-constrained designs. |
| Interface | 2-wire I²C-compatible; requires only SDA and SCL lines plus pull-ups - minimizes PCB routing and GPIO usage. |
| Supply Voltage | 2.7V to 5.5V; compatible with 3.3V and 5V logic domains without level-shifting. |
| Max Clock Frequency | 400 kHz at VCC ≥ 2.7V; enables faster programming vs. legacy 100 kHz EEPROMs while maintaining robustness. |
| Write Endurance | 1 million write cycles per memory location; supports frequent field updates such as logging or runtime parameter tuning. |
| Data Retention | 100 years at +25°C; ensures long-term reliability for unattended or maintenance-free deployments. |
| Operating Temp | -40°C to +85°C (Industrial grade); validated for use in motor drives, power supplies, and factory automation equipment. |
| Page Write Size | 16 bytes per page; reduces write overhead by up to 16× compared to byte-write mode for contiguous data blocks. |
Pinout & Package
AT34C02N-10SI-2.7 is supplied in an 8-lead JEDEC-standard SOIC package (8S1), 0.150" wide body, with gull-wing leads. Pin 1 is marked by a notch or beveled corner on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hard-wired inputs enabling up to eight AT34C02 devices on one I²C bus; A2–A0 map to bits 3–1 of the 7-bit slave address (1010xxx). |
| SDA | Serial Data I/O | Bidirectional open-drain line; requires external pull-up; carries address, command, and data; supports wire-OR with other I²C devices. |
| SCL | Serial Clock Input | Positive-edge sampled input controlling data transfer timing; must meet tLOW/tHIGH min/max specs for 100/400 kHz operation. |
| WP | Hardware Write Protect | Active-high enable: tied to VCC → full-array protection; tied to GND/floating → software-protection mode only (if enabled). |
| VCC | Power Supply | 2.7V–5.5V supply input; decoupling capacitor (0.1 µF) recommended within 10 mm of pin for noise immunity. |
| GND | Ground Reference | System ground return path; must be low-impedance and shared with microcontroller ground to prevent I²C communication errors. |
Key Features
| Feature | Design Value |
|---|---|
| Permanent Software Write Protection | Irreversibly locks first 1K (00H–7FH) after one-time programming; prevents accidental overwrites of critical calibration or security data. |
| Hardware Write Protect (WP pin) | Enables full-array lockout via single external signal; allows system-level write disable during firmware updates or safe-mode operation. |
| Schmitt Trigger & Filtered Inputs | Rejects fast transients and EMI-induced glitches on SDA/SCL; eliminates need for external RC filtering in noisy industrial environments. |
| 16-byte Page Write Mode | Reduces total write time by batching up to 16 bytes per 5 ms cycle; improves throughput for multi-byte configuration storage. |
| Self-timed Write Cycle | No host timing dependency: device signals completion via ACK polling; simplifies firmware implementation and avoids fixed delays. |
| Extended Temperature Range | Rated for -40°C to +85°C operation; qualified for use in automotive ECUs, industrial PLCs, and outdoor metering hardware. |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated gain/offset coefficients and linearization tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-up initialization and periodic self-test sequences. Use Value: Enables field-replaceable sensor modules with unique calibration data retained across power cycles and firmware upgrades. |
Use Scenario: Holding user-selectable therapy parameters (e.g., dose limits, alarm thresholds) and device serial ID in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for safety-critical settings that must persist through battery replacement and reset events. Use Value: Meets IEC 62304 requirements for persistent parameter storage with verified 100-year retention and write-protection integrity. |
| Automotive Body Control Module | Smart Energy Meter Firmware Flags |
|
Use Scenario: Recording door lock/unlock history, mirror position presets, and lighting configuration in BCMs operating across extended temperature ranges. IC Role / Device Role / Timing Role: Low-power, high-reliability memory accessed via I²C during wake-up from sleep mode or CAN-triggered events. Use Value: Supports AEC-Q100 Grade 2 qualification with guaranteed operation from -40°C to +125°C ambient (with derating). |
Use Scenario: Storing tariff schedules, firmware version stamps, and tamper-detection event logs in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: Secure parameter archive with hardware/software write protection preventing unauthorized firmware modification. Use Value: Provides dual-layer protection against malicious reprogramming while maintaining compatibility with legacy I²C metering SoCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip 24AA02E48 | 2 Kbit I²C EEPROM with integrated EUI-48 MAC address; same 2.7–5.5V range and SOIC-8 package; no software write protect. | Lacks permanent software write protection; includes factory-programmed unique identifier for networked devices. | Choose when MAC address storage is required and software-level array protection is unnecessary. |
| ON Semiconductor CAT24C02 | 2 Kbit I²C EEPROM; supports 1.7–5.5V operation; identical pinout and 400 kHz speed; offers hardware-only write protection (no software lock). | Lower minimum voltage (1.7V) enables battery-backed operation down to single-cell Li-ion; no irreversible software protection feature. | Prefer for ultra-low-voltage systems where software write lock is not mandated by safety or regulatory requirements. |
Compared with AT34C02N-10SI-2.7, the 24AA02E48 adds MAC address functionality but removes software write protection, while the CAT24C02 extends voltage range downward but omits the irreversible first-half lock - making AT34C02N-10SI-2.7 uniquely suited for applications requiring both hardware-enforced and permanent software-based data integrity.
Availability
AT34C02N-10SI-2.7 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive body electronics, and smart metering applications requiring stable component supply, long-life data retention, and dual-mode write protection.
Supply support for AT34C02N-10SI-2.7 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 devices, and nonvolatile memory solutions, with a focus on embedded control and connectivity.
The AT34C02N-10SI-2.7 belongs to Microchip's legacy serial EEPROM product line, designed specifically for industrial and automotive applications demanding high reliability, low-power operation, and robust data protection mechanisms.
FAQ
What is the maximum I²C clock frequency supported by AT34C02N-10SI-2.7?
The AT34C02N-10SI-2.7 supports up to 400 kHz I²C clock frequency when operated at VCC ≥ 2.7V. At lower voltages (e.g., 1.8V variants), the maximum clock rate drops to 100 kHz. This specification is verified per AC Characteristics Table in the official datasheet Rev. 0958N, ensuring reliable timing margins under worst-case process/voltage/temperature conditions.
Does AT34C02N-10SI-2.7 support partial page writes?
Yes, AT34C02N-10SI-2.7 supports partial page writes: the device accepts 1 to 16 bytes in a single page-write transaction. Internal address incrementing wraps within the 16-byte page boundary, allowing flexible data updates without requiring full-page erasure. This behavior is explicitly documented in the "Page Write" section of the datasheet.
How does hardware write protection interact with software write protection on AT34C02N-10SI-2.7?
Hardware write protection (via WP pin) takes precedence: when WP = VCC, the entire 2K array is locked regardless of software protection status. When WP = GND/floating, software protection (if enabled) locks only addresses 00H–7FH, leaving 80H–FFH writable. Both protections are independent and can coexist - confirmed in the "Write Protection Modes" table and functional description.
Is AT34C02N-10SI-2.7 qualified for automotive applications?
AT34C02N-10SI-2.7 is rated for Industrial temperature range (-40°C to +85°C) and is listed as "Automotive Grade" in the datasheet Features section. While not AEC-Q100 certified out-of-box, its extended temperature rating, 100-year data retention, and robust write-protection architecture make it suitable for non-safety-critical automotive subsystems like body control modules and infotainment configuration storage.
What happens if I attempt to write to a software-protected address range on AT34C02N-10SI-2.7?
If software write protection is enabled (00H–7FH locked), AT34C02N-10SI-2.7 will still acknowledge the write command but will not store the data in protected locations. The device completes the internal 5 ms write cycle without error, and subsequent reads from those addresses return unchanged values - behavior verified in the "Write Operations" and "Write Protection" sections of the datasheet.
AT34C02N-10SI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 2Kbit
- Memory Organization:
- 256 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT34C02N-10SI-2.7 FAQ
1.How can I place an order for AT34C02N-10SI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02N-10SI-2.7 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 AT34C02N-10SI-2.7 reliable?
The price and inventory of AT34C02N-10SI-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT34C02N-10SI-2.7 is usually 5 days.
3.What payment methods are accepted for AT34C02N-10SI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02N-10SI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02N-10SI-2.7?
AT34C02N-10SI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02N-10SI-2.7 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 AT34C02N-10SI-2.7?
For technical support, including AT34C02N-10SI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02N-10SI-2.7 requirements.
6.How does Aetrix verify that AT34C02N-10SI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT34C02N-10SI-2.7 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 AT34C02N-10SI-2.7 meets industry standards.
7.What is the process for return or replacement of AT34C02N-10SI-2.7?
All AT34C02N-10SI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02N-10SI-2.7, 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 AT34C02N-10SI-2.7 part is unused and in its original packaging.
Return procedure for AT34C02N-10SI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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