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Microchip Technology AT34C02-10PC
- Part No.:
- AT34C02-10PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT34C02-10PC.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,491
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Product details
Overview
AT34C02-10PC 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 communication, features 16-byte page writes, and delivers 1 million write cycles with 100-year data retention in an 8-pin PDIP package - used for configuration storage in industrial controllers and power management systems.
For engineers reviewing the AT34C02-10PC datasheet, AT34C02-10PC pinout, AT34C02-10PC application, or AT34C02-10PC equivalent, key selection criteria include its dual write-protection architecture, 2.7V–5.5V supply range, 400 kHz I²C speed at ≥2.7V, PDIP-8 package compatibility, and guaranteed endurance/reliability for long-life embedded firmware storage.
Technical Context
The AT34C02-10PC implements a standard 2-wire (I²C-compatible) serial interface with Schmitt-triggered, noise-filtered SDA/SCL inputs. Its memory array is organized as 256 words of 8 bits, with device addressing controlled by hard-wired A0–A2 pins supporting up to eight devices on one bus.
Write protection operates through two independent mechanisms: irreversible software locking of addresses 00H–7FH (first half), and hardware-level full-array protection enabled when WP = VCC. The device uses internal timing for self-timed write cycles (max 10 ms) and supports acknowledge polling to detect write completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8) - sufficient for storing calibration data, device IDs, or small firmware parameters in space-constrained designs. |
| Supply Voltage | 2.7V to 5.5V - enables direct integration with 3.3V and 5V microcontroller systems without level-shifting. |
| I²C Speed | 400 kHz at ≥2.7V - supports fast configuration updates while maintaining compatibility with legacy I²C masters. |
| Write Endurance | 1 million cycles - ensures reliable field reprogramming over product lifetime in telemetry or energy metering applications. |
| Data Retention | 100 years - guarantees nonvolatile storage integrity across decades without battery backup. |
| Write Cycle Time | 10 ms max - defines minimum interval between successive write commands; impacts real-time logging latency. |
| ESD Protection | >3,000V HBM - provides robust handling during board assembly and field service in industrial environments. |
Pinout & Package
AT34C02-10PC is supplied in an 8-pin Plastic Dual Inline Package (PDIP), 0.300" wide (package code 8P3), suitable for through-hole prototyping and legacy industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hard-wired address bits enabling up to eight AT34C02-10PC devices on a single I²C bus without external logic. |
| SDA | Serial Data I/O | Bidirectional open-drain line requiring external pull-up; shares bus with other I²C peripherals. |
| SCL | Serial Clock Input | Master-generated clock signal synchronizing all data transfers; filtered for noise immunity. |
| WP | Hardware Write Protect | Active-high pin: tied to VCC to lock entire memory array; grounded or floating to allow software-controlled partial protection. |
| VCC | Power Supply | Primary supply input (2.7–5.5V); powers internal logic and EEPROM array during read/write operations. |
| GND | Ground Reference | Common return path for all internal circuitry and I/O signals; must be low-impedance for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Permanent Software Write Protection | Irreversibly locks addresses 00H–7FH after programming - prevents accidental or malicious overwrite of critical boot parameters. |
| Hardware Write Protection (WP pin) | Full-array lock activated by tying WP to VCC - enables system-level security independent of firmware state. |
| 16-byte Page Write Mode | Reduces write transaction overhead by up to 16× vs. byte writes - improves efficiency in bulk configuration updates. |
| Self-timed Write Cycle | No external timing control needed; internal circuitry manages erase/write/verify - simplifies host firmware design. |
| Schmitt Trigger + Noise Filtering | Rejects EMI-induced glitches on SDA/SCL - enhances reliability in electrically noisy factory automation environments. |
Applications
| Industrial PLC Configuration Storage | Smart Energy Meter Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning constants, and alarm thresholds in programmable logic controllers deployed in manufacturing lines. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing persistent parameter retention across power cycles and firmware upgrades. Use Value: Enables field reconfiguration without hardware modification; dual write protection prevents corruption during maintenance or firmware updates. | Use Scenario: Holding metrology calibration coefficients, tariff schedules, and tamper-event logs in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, long-life data vault interfacing directly with the meter's MCU via I²C at 400 kHz. Use Value: 100-year retention and 1M write cycles ensure accuracy compliance over 20+ year meter lifetimes; WP pin allows factory lockdown post-calibration. |
| Medical Device Serial Number Registry | Automotive Body Control Module Settings |
Use Scenario: Recording unique device identifiers, manufacturing dates, and regulatory certification codes in Class II medical instruments. IC Role / Device Role / Timing Role: Tamper-resistant identity storage element accessed during boot and diagnostics routines. Use Value: Permanent software write protection secures serial numbers against unauthorized rewriting; PDIP package supports manual rework in regulated production. | Use Scenario: Saving user preferences (mirror position, seat memory), fault history, and CAN node configuration in automotive BCMs. IC Role / Device Role / Timing Role: Robust configuration memory operating across -40°C to +85°C ambient with 2.7V–5.5V supply tolerance. Use Value: Hardware WP pin allows OEMs to lock settings after vehicle personalization; high ESD rating withstands assembly-line handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95020-WMN6TP | 2 Kbit SPI interface, 5 MHz max clock, same 2.7–5.5V range, 1M endurance, but no software write protection. | Requires SPI-capable MCU; lacks dual-layer (software + hardware) protection scheme. | Select when SPI interface is preferred and full-array hardware protection suffices. |
| 24LC02BT-I/P | 2 Kbit I²C EEPROM, 400 kHz, 2.5–5.5V, 1M endurance, but only hardware WP pin - no permanent software protection. | Same pinout (PDIP-8), identical I²C protocol, but missing irreversible first-half lock capability. | Choose for drop-in replacement where software write protection is not required. |
Compared with M95020-WMN6TP and 24LC02BT-I/P, the AT34C02-10PC uniquely combines I²C compatibility, permanent software-based first-half protection, and hardware full-array lock - making it optimal for applications demanding layered data security without changing MCU interface peripherals.
Availability
AT34C02-10PC is available at Aetrix Electronics and suitable for industrial PLCs, smart energy meters, medical instrumentation, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for AT34C02-10PC 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 for industrial, automotive, and consumer markets.
The AT34C02-10PC belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-power, long-term data storage in resource-constrained embedded systems with stringent security and longevity requirements.
FAQ
What voltage range does the AT34C02-10PC support?
The AT34C02-10PC supports a supply voltage range of 2.7V to 5.5V, enabling interoperability with both 3.3V and 5V microcontroller systems. This dual-voltage capability eliminates the need for level shifters in mixed-supply designs and ensures stable operation across varying power rail conditions encountered in industrial and automotive environments. The AT34C02-10PC maintains full functionality-including 400 kHz I²C speed and 16-byte page writes-across this entire range.
How does the software write protection work on the AT34C02-10PC?
The AT34C02-10PC implements permanent software write protection for the first 1K bits (addresses 00H–7FH) by programming an internal write protect register using a dedicated I²C command (device address 0110). Once programmed, this protection cannot be reversed-even after power cycling. The AT34C02-10PC continues normal read/write operations for the second half (80H–FFH), and hardware WP pin control remains fully functional. This feature ensures critical boot data remains immutable in field-deployed systems.
Can the AT34C02-10PC be used in automotive applications?
Yes, the AT34C02-10PC is qualified for automotive-grade operation with extended temperature variants available (–40°C to +85°C). While the AT34C02-10PC itself is rated for commercial temperature (0°C to 70°C), its underlying architecture-1 million write cycles, 100-year retention, >3,000V ESD, and hardware WP pin-meets core reliability requirements for body control modules and infotainment subsystems. For under-hood use, engineers should select the industrial-grade variant AT34C02-10PI or automotive-qualified equivalents.
What is the maximum I²C clock frequency supported by the AT34C02-10PC?
The AT34C02-10PC supports up to 400 kHz I²C clock frequency when operated at 2.7V or higher. At 1.8V operation (not applicable to AT34C02-10PC), the maximum drops to 100 kHz. This 400 kHz capability enables faster configuration loading and parameter updates compared to standard 100 kHz EEPROMs, reducing boot time and improving responsiveness in real-time embedded systems using the AT34C02-10PC.
Does the AT34C02-10PC require external pull-up resistors on SDA and SCL lines?
Yes, the AT34C02-10PC requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time. The AT34C02-10PC's Schmitt-triggered inputs tolerate slow-rising edges, allowing flexibility in resistor selection while maintaining noise immunity-critical for stable communication in electrically noisy industrial installations using the AT34C02-10PC.
AT34C02-10PC 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT34C02-10PC FAQ
1.How can I place an order for AT34C02-10PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02-10PC 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 AT34C02-10PC reliable?
The price and inventory of AT34C02-10PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT34C02-10PC is usually 5 days.
3.What payment methods are accepted for AT34C02-10PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02-10PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02-10PC?
AT34C02-10PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02-10PC 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 AT34C02-10PC?
For technical support, including AT34C02-10PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02-10PC requirements.
6.How does Aetrix verify that AT34C02-10PC is sourced from the original manufacturer or authorized distributors?
All AT34C02-10PC 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 AT34C02-10PC meets industry standards.
7.What is the process for return or replacement of AT34C02-10PC?
All AT34C02-10PC units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02-10PC, 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 AT34C02-10PC part is unused and in its original packaging.
Return procedure for AT34C02-10PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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