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Microchip Technology AT34C02N-10SI
- Part No.:
- AT34C02N-10SI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT34C02N-10SI.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
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Product details
Overview
AT34C02N-10SI from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) serial EEPROM with permanent software write protection for the first 1K bits and hardware write protection via the WP pin. It operates from 2.7V to 5.5V, supports 400 kHz I²C interface at 2.7V+, features 16-byte page writes, 1 million endurance cycles, and 100-year data retention. It is used in industrial control systems for storing calibration data, configuration settings, and firmware parameters.
For engineers reviewing the AT34C02N-10SI datasheet, AT34C02N-10SI pinout, AT34C02N-10SI application, or AT34C02N-10SI equivalent, key selection considerations include its dual write-protection architecture, industrial temperature range (−40°C to +85°C), SOIC-8 package, 10 ms max write cycle time, and compatibility with standard 2-wire (I²C) bus protocols across microcontroller platforms.
Technical Context
The AT34C02N-10SI implements a true 2-wire (I²C-compatible) serial interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. Its memory array is organized as 256 words of 8 bits, with device addressing using A0–A2 pins enabling up to eight devices on one bus.
Write protection is implemented through two independent mechanisms: irreversible software locking of addresses 00H–7FH (first half), and hardware-level full-array protection controlled by the WP pin - both active simultaneously without conflict. The device enters low-power standby mode after STOP condition or power-up, drawing ≤4 µA at 2.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8), sufficient for small configuration tables or sensor calibration data storage |
| Supply Voltage Range | 2.7V to 5.5V - supports mixed-voltage system integration without level shifters |
| I²C Clock Frequency | Up to 400 kHz at ≥2.7V - enables fast parameter updates in real-time embedded systems |
| Write Cycle Time | Max 10 ms - defines minimum interval between successive write commands |
| Endurance | 1 million write cycles - ensures long-term reliability in field-updatable applications |
| Data Retention | 100 years at +25°C - guarantees nonvolatile storage integrity over product lifetime |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade deployment without derating |
| ESD Protection | >3,000 V HBM - enhances robustness in handling-sensitive manufacturing and field service |
Pinout & Package
AT34C02N-10SI is supplied in an 8-lead JEDEC SOIC package (package code 8S1), measuring 3.99 mm × 4.98 mm × 1.75 mm, with gull-wing leads and standard 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hard-wired address bits enabling up to eight AT34C02N-10SI devices on a single I²C bus |
| SDA | Serial Data I/O | Bidirectional open-drain line shared across I²C devices; requires external pull-up resistor |
| SCL | Serial Clock Input | Master-generated clock controlling timing of all data transfers; Schmitt-triggered for noise immunity |
| WP | Hardware Write Protect | Active-high pin: logic high disables all writes to entire memory array regardless of software protection state |
| VCC | Power Supply | Primary supply input (2.7V–5.5V); powers internal logic and EEPROM core |
| GND | Ground Reference | Common return path for VCC and signal lines; must be low-impedance for stable I²C operation |
Key Features
| Feature | Design Value |
|---|---|
| Permanent Software Write Protection | Irreversible lock of first 1K bits (00H–7FH) via dedicated 0110 control byte - prevents accidental or malicious overwrite of critical boot/config data |
| Dual Write Protection Architecture | Independent software (half-array) and hardware (full-array) protection layers - enables flexible security policies per application segment |
| 16-byte Page Write Mode | Reduces I²C transaction overhead by allowing up to 16 bytes per write cycle - improves efficiency in bulk parameter updates |
| Noise-Suppressed Inputs | Schmitt-trigger + filtering on SDA/SCL - eliminates false triggering in electrically noisy industrial environments |
| Low Standby Current | ≤4 µA at 2.7V - minimizes power draw in always-on or battery-backed systems |
| Industrial Temperature Rating | −40°C to +85°C operation - validated for use in motor drives, PLCs, and outdoor metering equipment |
Applications
| Industrial Sensor Calibration | Smart Meter Configuration 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 holding trim values accessed at power-up before ADC initialization. Use Value: Enables field-replaceable sensor modules with pre-loaded calibration data, eliminating recalibration during maintenance. | Use Scenario: Retaining tariff schedules, billing counters, and communication parameters in electricity/water meters operating for >10 years unattended. IC Role / Device Role / Timing Role: Persistent parameter store updated infrequently but requiring guaranteed retention under intermittent power loss. Use Value: Meets ANSI C12.1 and IEC 62056 standards for metrology data integrity with 100-year retention and 1M-cycle endurance. |
| Embedded System Boot Configuration | Automotive Body Control Module Settings |
Use Scenario: Holding user-selectable boot modes, display brightness presets, and network MAC address overrides in medical diagnostic equipment. IC Role / Device Role / Timing Role: Early-boot configuration source read by MCU before OS load; supports partial rewrites during firmware updates. Use Value: Allows safe in-field customization without requiring full flash reprogramming or risking corruption of main firmware image. | Use Scenario: Storing seat position memory, mirror angle presets, and lighting profiles in automotive BCMs exposed to thermal cycling and vibration. IC Role / Device Role / Timing Role: Ruggedized nonvolatile storage interfaced directly to 5V-tolerant MCU I²C port; survives repeated cold cranking events. Use Value: Qualified to AEC-Q100 Grade 2 (−40°C to +105°C ambient), with ESD >3 kV ensuring reliability in vehicle assembly and service environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-WMN6TP | 256 Kbit SPI interface, 5V-only (4.5–5.5V), no software write protect, 5 ms write cycle | Larger capacity but incompatible bus protocol; lacks dual protection scheme | Select only if SPI interface is required and higher density justifies redesign and loss of write-protection flexibility |
| 24LC024T-I/OT | 2 Kbit I²C, 1.8–5.5V, no permanent software protection, 5 ms write cycle, SOT-23-6 package | Same density and voltage range but missing irreversible first-half lock; smaller footprint limits heat dissipation | Choose when board space is constrained and software-level protection suffices; not suitable for safety-critical configuration storage |
Compared with M95256-WMN6TP and 24LC024T-I/OT, the AT34C02N-10SI uniquely combines industrial temperature rating, permanent software write protection for critical data segments, and hardware-enforced full-array lock - making it the only option among the three qualified for tamper-resistant, long-life embedded configuration storage where data integrity is non-negotiable.
Availability
AT34C02N-10SI is available at Aetrix Electronics and suitable for industrial automation, smart metering, and embedded medical device applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for AT34C02N-10SI 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 memory solutions, with a focus on embedded control and connectivity.
The AT34C02N-10SI belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-power, and secure nonvolatile data storage in harsh industrial and automotive environments.
FAQ
What is the maximum I²C clock frequency supported by the AT34C02N-10SI?
The AT34C02N-10SI supports up to 400 kHz I²C clock frequency when operated at VCC ≥ 2.7V. At lower voltages (e.g., 1.8V versions), the maximum is reduced to 100 kHz. This specification is confirmed in the AC Characteristics table of the official datasheet, and the 400 kHz capability enables faster parameter loading in time-sensitive industrial control loops.
Does the AT34C02N-10SI support partial page writes?
Yes, the AT34C02N-10SI supports partial page writes within its 16-byte page boundary. The device accepts 1–16 bytes per write transaction, with automatic internal address incrementation. This feature allows efficient updates of scattered configuration fields without requiring full-page erasure or overwriting adjacent data - a key advantage over block-erase EEPROM architectures.
How does hardware write protection interact with software write protection on the AT34C02N-10SI?
Hardware write protection (via WP pin) and software write protection (for 00H–7FH) operate independently on the AT34C02N-10SI. When WP = VCC, all writes are blocked regardless of software protection status. When WP = GND/floating, software protection governs access to the first half, while the second half remains writable. Both can be active simultaneously, providing layered security.
What package type is used for the AT34C02N-10SI?
The AT34C02N-10SI uses an 8-lead JEDEC SOIC package (package code 8S1), with 1.27 mm lead pitch, 3.99 mm × 4.98 mm body dimensions, and gull-wing leads. This surface-mount package is compatible with standard reflow soldering processes and widely supported in industrial PCB assembly lines.
Is the AT34C02N-10SI rated for automotive applications?
The AT34C02N-10SI is specified for industrial temperature range (−40°C to +85°C) and is not AEC-Q200 qualified. While it may function in some automotive body electronics, Microchip offers automotive-grade variants (e.g., AT34C02N-10SI-2.7 with extended qualification) - the standard AT34C02N-10SI should be selected only for non-safety-critical industrial or commercial use cases.
AT34C02N-10SI 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT34C02N-10SI FAQ
1.How can I place an order for AT34C02N-10SI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02N-10SI 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 reliable?
The price and inventory of AT34C02N-10SI 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 is usually 5 days.
3.What payment methods are accepted for AT34C02N-10SI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02N-10SI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02N-10SI?
AT34C02N-10SI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02N-10SI 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?
For technical support, including AT34C02N-10SI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02N-10SI requirements.
6.How does Aetrix verify that AT34C02N-10SI is sourced from the original manufacturer or authorized distributors?
All AT34C02N-10SI 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 meets industry standards.
7.What is the process for return or replacement of AT34C02N-10SI?
All AT34C02N-10SI units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02N-10SI, 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 part is unused and in its original packaging.
Return procedure for AT34C02N-10SI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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