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Microchip Technology AT34C02-10PI-2.7
- Part No.:
- AT34C02-10PI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT34C02-10PI-2.7.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,041
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Product details
Overview
AT34C02-10PI-2.7 from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) serial EEPROM IC 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 communication at 2.7V+, features 16-byte page write, and is housed in an 8-lead PDIP package. It is used in industrial control systems for storing calibration data, configuration settings, and firmware parameters.
For engineers reviewing the AT34C02-10PI-2.7 datasheet, AT34C02-10PI-2.7 pinout, AT34C02-10PI-2.7 application, or AT34C02-10PI-2.7 equivalent, key selection criteria include its dual write-protection architecture (software + hardware), guaranteed 1 million endurance cycles, 100-year data retention, automotive-grade temperature range (–40°C to +85°C), and compatibility with standard 2-wire (I²C) bus protocols.
Technical Context
The AT34C02-10PI-2.7 implements a true 2-wire (I²C-compatible) interface with Schmitt-triggered, noise-filtered inputs and bidirectional SDA. Its internal architecture includes a 256-word × 8-bit memory array organized into 16 pages of 16 bytes each, with address pins A0–A2 enabling up to eight devices on one bus.
Write protection is implemented at two levels: irreversible software locking of addresses 00H–7FH (first half) via a dedicated 0110 device address command, and hardware-level full-array protection controlled by the WP pin - active when pulled high to VCC. Both mechanisms coexist and are independently configurable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2048 bits (256 × 8), organized as 16 pages × 16 bytes - enables efficient block updates without full-erase overhead. |
| Supply Voltage Range | 2.7V to 5.5V - supports direct integration into 3.3V and 5V logic systems without level-shifting. |
| I²C Clock Frequency | Up to 400 kHz at VCC ≥ 2.7V - ensures fast configuration writes in time-critical embedded boot sequences. |
| Write Cycle Time | Max 5 ms per byte or page - defines minimum inter-write delay; critical for real-time logging applications. |
| Endurance | 1,000,000 write cycles - guarantees long-term reliability in field-updatable systems like smart meters and PLCs. |
| Data Retention | 100 years at +25°C - ensures firmware or calibration data integrity across product lifetime without refresh. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and motor drives. |
Pinout & Package
AT34C02-10PI-2.7 is packaged in an 8-lead PDIP (Plastic Dual Inline Package), 0.300" wide body, with through-hole mounting and industry-standard pin spacing (0.100" pitch). Pin 1 is marked by a notch or dot at the top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hard-wired inputs that set the 3 LSBs of the 7-bit I²C slave address (1010xxx); allow up to eight AT34C02 devices on one bus. |
| SDA | Serial Data I/O | Bidirectional open-drain line for data transfer; requires external pull-up resistor; supports wire-OR with other I²C devices. |
| SCL | Serial Clock Input | Positive-edge clock input for data latching; negative-edge sampling for data output; defines I²C timing compliance. |
| WP | Hardware Write Protect | Active-high enable for full-array write lock; overrides software protection when tied to VCC; floating/GND enables normal operation. |
| VCC | Power Supply | Primary supply input (2.7V–5.5V); powers internal logic, EEPROM array, and HV pump for write operations. |
| GND | Ground Reference | System ground return path; required for stable biasing of internal circuitry and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Permanent Software Write Protection | Irreversible lock of first 1K bits (00H–7FH) via 0110 device address command - prevents accidental or malicious corruption of critical boot parameters. |
| Hardware Write Protection | Full-array lock enabled by pulling WP high to VCC - provides fail-safe, externally controllable protection independent of firmware state. |
| 16-byte Page Write Mode | Reduces write latency vs. byte writes; allows up to 16 sequential bytes per 5 ms cycle - improves efficiency in configuration batch updates. |
| Noise-Suppressed Inputs | Schmitt-trigger + filtering on SDA/SCL - eliminates false triggering in electrically noisy industrial environments (e.g., near motors or relays). |
| Low Standby Current | 1.6 µA typical at 2.7V - minimizes power draw in battery-backed or energy-harvesting systems during idle periods. |
Applications
| Industrial Sensor Calibration | Smart Meter Configuration Storage |
|---|---|
|
Use Scenario: Storing factory-trimmed offset/gain coefficients and linearization tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 100-year retention and 1M-cycle endurance to survive repeated field recalibration. Use Value: Eliminates need for external backup batteries or supercapacitors while ensuring calibration persistence across power cycles and system resets. |
Use Scenario: Holding tariff schedules, meter ID, billing history, and security keys in utility-grade electricity/water meters operating unattended for 15+ years. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration memory with dual write protection - software lock for factory-set keys, hardware lock for field-updated tariffs. Use Value: Prevents unauthorized firmware or rate-table modification while enabling safe over-the-air updates to non-critical fields via controlled WP pin management. |
| Automotive Body Control Module | Medical Device Usage Logs |
|
Use Scenario: Recording seat position presets, mirror angles, and lighting profiles in automotive BCMs for driver personalization. IC Role / Device Role / Timing Role: Low-voltage (2.7V) EEPROM interfaced directly to 3.3V microcontroller I²C bus; operates across –40°C to +85°C ambient. Use Value: Enables reliable storage without voltage translation, reducing BOM count and PCB area while meeting AEC-Q200 stress requirements. |
Use Scenario: Logging sterilization cycles, usage counts, and error events in Class II medical equipment requiring FDA-compliant audit trails. IC Role / Device Role / Timing Role: Tamper-evident storage where WP pin is hardwired to VCC during final assembly to lock log integrity after commissioning. Use Value: Provides hardware-enforced immutability of regulatory records - satisfies 21 CFR Part 11 electronic record requirements without software-only solutions. |
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 (32K × 8), SPI interface, 5 ms write cycle, 1.8V–5.5V operation - larger capacity but different protocol. | Requires SPI host controller instead of I²C; better suited for high-bandwidth logging, not drop-in replacement. | Select when migrating from I²C to SPI infrastructure or needing >2 Kbit capacity with same package footprint. |
| 24LC024T-I/OT | 2 Kbit I²C EEPROM, SOT-23-6 package, 1.8V–5.5V, 1M endurance - identical function but smaller 6-pin surface-mount package. | Lacks A0–A2 address pins; single-device-per-bus only; no hardware WP pin - reduced flexibility in multi-device systems. | Choose for space-constrained designs where board area is critical and multi-drop addressing is unnecessary. |
Compared with M95256-WMN6TP and 24LC024T-I/OT, the AT34C02-10PI-2.7 uniquely combines I²C compatibility, hardware + software write protection, 8-pin PDIP through-hole mounting, and industrial temperature rating - making it optimal for legacy industrial controls and repair-replace scenarios requiring mechanical and electrical interchangeability.
Availability
AT34C02-10PI-2.7 is available at Aetrix Electronics and suitable for industrial automation, smart metering, and automotive body electronics requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for AT34C02-10PI-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 memory products, with a focus on reliability, longevity, and embedded system integration.
The AT34C02 series belongs to Microchip's legacy serial EEPROM portfolio, designed specifically for industrial and automotive applications demanding robust nonvolatile storage with flexible, layered write protection schemes.
FAQ
What is the maximum I²C clock frequency supported by the AT34C02-10PI-2.7?
The AT34C02-10PI-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 is 100 kHz. This timing is validated per AC Characteristics Table in the datasheet and applies across the full –40°C to +85°C temperature range. The AT34C02-10PI-2.7 uses standard I²C timing parameters including tLOW, tHIGH, and tSU.STA to ensure interoperability with common microcontrollers.
How does hardware write protection work on the AT34C02-10PI-2.7?
Hardware write protection on the AT34C02-10PI-2.7 is controlled by the WP pin: when pulled high to VCC, it disables all write operations to the entire 2 Kbit array regardless of software protection status. When WP is grounded or left floating, write access depends on the software write protect register state. This dual-layer scheme ensures physical-level security - for example, a hardware lock can be asserted during manufacturing to prevent post-deployment reprogramming of critical firmware flags in the AT34C02-10PI-2.7.
Can the software write protection on the AT34C02-10PI-2.7 be disabled after it is enabled?
No, the software write protection on the AT34C02-10PI-2.7 is permanent and irreversible once enabled. It locks addresses 00H–7FH (first 1K bits) by programming an internal register using the 0110 device address command. Power cycling, reset, or reprogramming has no effect - the protection remains active for the device's lifetime. This feature is intended for safeguarding immutable factory data such as calibration constants or security keys stored in the AT34C02-10PI-2.7.
What package type is used for the AT34C02-10PI-2.7?
The AT34C02-10PI-2.7 uses an 8-lead PDIP (Plastic Dual Inline Package) with 0.300" body width and 0.100" lead pitch. This through-hole package is compatible with standard wave-soldering processes and prototyping breadboards. The "PI" suffix in the part number explicitly denotes PDIP packaging, distinguishing it from SOIC (SI), TSSOP (TI), or MAP (YI) variants of the same AT34C02-10PI-2.7 functional family.
Does the AT34C02-10PI-2.7 support page write operations?
Yes, the AT34C02-10PI-2.7 supports 16-byte page write mode, allowing up to 16 sequential bytes to be written in a single 5 ms internal cycle. This reduces total programming time compared to individual byte writes and is especially useful for updating configuration blocks or lookup tables. Partial page writes are permitted, and address roll-over wraps within the same page - a behavior confirmed in the Device Operation section of the AT34C02-10PI-2.7 datasheet.
AT34C02-10PI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT34C02-10PI-2.7 FAQ
1.How can I place an order for AT34C02-10PI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02-10PI-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 AT34C02-10PI-2.7 reliable?
The price and inventory of AT34C02-10PI-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 AT34C02-10PI-2.7 is usually 5 days.
3.What payment methods are accepted for AT34C02-10PI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02-10PI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02-10PI-2.7?
AT34C02-10PI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02-10PI-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 AT34C02-10PI-2.7?
For technical support, including AT34C02-10PI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02-10PI-2.7 requirements.
6.How does Aetrix verify that AT34C02-10PI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT34C02-10PI-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 AT34C02-10PI-2.7 meets industry standards.
7.What is the process for return or replacement of AT34C02-10PI-2.7?
All AT34C02-10PI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02-10PI-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 AT34C02-10PI-2.7 part is unused and in its original packaging.
Return procedure for AT34C02-10PI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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