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Microchip Technology AT34C02N-10SC
- Part No.:
- AT34C02N-10SC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT34C02N-10SC.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,416
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Product details
Overview
AT34C02N-10SC 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, 2-wire I²C-compatible interface, and operation across 2.7V to 5.5V supply. It supports 400 kHz clock rate at 2.7V+, features 16-byte page writes, and is rated for 1 million write cycles and 100-year data retention. Used in industrial control panels for configuration storage.
For engineers reviewing the AT34C02N-10SC datasheet, AT34C02N-10SC pinout, AT34C02N-10SC application, or AT34C02N-10SC equivalent, key selection criteria include voltage range compatibility (2.7V–5.5V), WP pin behavior under VCC/GND/floating conditions, software write protect irreversibility, page write timing (10 ms max), and SOIC-8 package footprint constraints.
Technical Context
The AT34C02N-10SC implements a true 2-wire (I²C-compatible) serial interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain SDA output. Its internal address counter supports current-address, random-address, and sequential read modes, while device addressing uses hardwired A0–A2 pins enabling up to eight devices on one bus.
Write protection operates at two independent levels: software-based (permanent, irreversible, covers 00H–7FH only) and hardware-based (WP pin-controlled, covers full 2K array). The device enters standby mode after STOP condition and exhibits sub-4 µA standby current at 2.7V, making it suitable for low-power embedded systems requiring nonvolatile parameter storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Kbit (256 × 8), organized as 256 addressable bytes - sufficient for firmware calibration tables or device ID storage. |
| Supply Voltage Range | 2.7V to 5.5V - supports direct interfacing with 3.3V and 5V microcontrollers without level shifting. |
| Interface Speed | 400 kHz max (at ≥2.7V) - enables fast parameter updates during system initialization or field reconfiguration. |
| Write Cycle Time | 10 ms maximum - defines minimum interval between successive write commands; impacts real-time logging latency. |
| Endurance | 1 million write cycles - ensures reliable operation over 10+ years in daily-configurable industrial HMI applications. |
| Data Retention | 100 years at +25°C - guarantees long-term integrity of stored calibration or security keys without refresh. |
| ESD Protection | >3,000V HBM - provides robustness against handling and board-level electrostatic discharge events. |
Pinout & Package
AT34C02N-10SC is housed in an 8-lead JEDEC SOIC (package code 8S1), 3.9mm × 4.9mm body, 1.27mm pitch, gull-wing lead form. Pin 1 is marked by notch or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hardwired inputs determining I²C slave address (1010xxx); enable up to eight AT34C02N-10SC devices on same bus. |
| SDA | Serial Data I/O | Open-drain bidirectional line - requires external pull-up; shares bus with other I²C peripherals. |
| SCL | Serial Clock Input | Master-generated clock; timing-critical for ACK/NACK and data validity windows per I²C spec. |
| WP | Hardware Write Protect | Active-high protection: tied to VCC → full-array lock; GND/floating → software-protection mode enabled. |
| VCC | Power Supply | 2.7V–5.5V input; powers internal logic and EEPROM array; decoupling capacitor required near pin. |
| GND | Ground Reference | Return path for all internal circuits; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Permanent Software Write Protection | Irreversible lock of first 1K (00H–7FH) after programming - prevents accidental overwrite of critical boot parameters. |
| Hardware Write Protect (WP) | External pin enables full-array protection regardless of software state - allows runtime lockdown via MCU GPIO or jumper. |
| 16-byte Page Write Mode | Reduces write overhead vs. byte-by-byte: 16x faster bulk update of contiguous settings (e.g., sensor offset tables). |
| Low Standby Current | ≤4.0 µA at 2.7V - minimizes battery drain in always-on edge nodes or backup power scenarios. |
| Noise-Suppressed Inputs | Schmitt trigger + filtering on SDA/SCL - eliminates false triggering from EMI in motor drive or power supply environments. |
Applications
| Industrial PLC Configuration Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing user-defined I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during cold start and updated via maintenance port; no timing-critical reads during scan cycle. Use Value: Ensures deterministic startup behavior after power loss; software write protection prevents corruption of safety-critical defaults during firmware updates. | Use Scenario: Holding factory-calibrated sensor offsets and gain coefficients in portable blood glucose meters and infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-regulated calibration data; accessed once per power-on and verified before measurement. Use Value: Meets IEC 62304 data integrity requirements; hardware WP pin allows final-lockdown before device sterilization and shipment. |
| Automotive Body Control Module Settings | Smart Energy Meter Tariff Tables |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and door lock configurations in 12V automotive BCMs operating across -40°C to +85°C. IC Role / Device Role / Timing Role: EEPROM interface synchronized to CAN-initiated configuration writes; withstands load-dump transients via internal ESD structure. Use Value: Qualified for automotive temperature range; >3,000V HBM rating protects against assembly-line ESD and in-vehicle coupling events. | Use Scenario: Storing time-of-use tariff schedules, billing counters, and utility authentication keys in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Long-life data logger memory updated monthly via optical port; retains values through 10+ year service life. Use Value: 100-year data retention eliminates need for periodic recalibration or memory replacement in sealed meter housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M24C02-RMN6TP | 2 Kbit, 1.7V–5.5V, 400 kHz, SOIC-8; no permanent software write protect - uses volatile lock bits only. | Lacks irreversible first-half protection; requires external MCU supervision for critical parameter safeguarding. | Choose when full-array flexibility is needed and software-level protection suffices. |
| CAT24C02WI-GT3 | 2 Kbit, 1.7V–5.5V, 400 kHz, SOIC-8; includes write protect pin but no software write protect register. | Hardware-only WP; cannot permanently lock first half independently - all-or-nothing protection model. | Prefer when simple, pin-driven lockdown suffices and software-level granularity is unnecessary. |
Compared with AT34C02N-10SC, M24C02-RMN6TP offers wider voltage range but lacks irreversible software protection, while CAT24C02WI-GT3 simplifies design with hardware-only WP but removes the ability to selectively lock only the first 1K - making AT34C02N-10SC uniquely suited for applications requiring both flexible and permanent protection layers.
Availability
AT34C02N-10SC 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-lifecycle support, and guaranteed SOIC-8 footprint compatibility.
Supply support for AT34C02N-10SC 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 support, documentation, and manufacturing continuity for the AT34C02 family.
The AT34C02 series was designed specifically for cost-sensitive, low-power embedded systems needing reliable, pin-compatible 2 Kbit EEPROM with dual-layer write protection - targeting industrial, medical, and automotive subsystems where data integrity is non-negotiable.
FAQ
What is the supply voltage range supported by the AT34C02N-10SC?
The AT34C02N-10SC operates from 2.7V to 5.5V, as confirmed in its ordering code suffix "-2.7" and DC characteristics table. This dual-voltage capability allows direct integration with both 3.3V and 5V microcontroller systems without level-shifting circuitry. The device maintains full 400 kHz I²C speed across this entire range, unlike 1.8V variants which are limited to 100 kHz.
Does the AT34C02N-10SC support permanent write protection of only part of its memory?
Yes - the AT34C02N-10SC implements permanent software write protection for the first 1K (addresses 00H–7FH), activated via a dedicated 0110 control code. Once enabled, this protection cannot be reversed, even after power cycling. This feature is unique to the AT34C02N-10SC within its voltage grade and distinguishes it from alternatives offering only full-array hardware protection.
How does the WP pin function on the AT34C02N-10SC?
On the AT34C02N-10SC, the WP pin provides hardware-level write protection: when pulled high to VCC, it locks the entire 2K array regardless of software protection status; when grounded or floating, software protection (if enabled) governs first-half access while second-half remains writable. This dual-mode control enables flexible, layered data security strategies in field-deployed equipment.
What is the maximum write cycle time for the AT34C02N-10SC?
The AT34C02N-10SC has a maximum write cycle time of 10 ms, as specified in its ordering code "-10" and AC characteristics table. This applies to both byte and page writes and represents the internal clear/write duration - during which all inputs are disabled and the device does not respond to I²C commands until completion, requiring acknowledge polling for synchronization.
Is the AT34C02N-10SC compatible with standard I²C protocols?
Yes - the AT34C02N-10SC implements a fully compliant 2-wire serial interface with standard I²C timing: START/STOP conditions, 7-bit slave addressing (1010xxx), ACK/NACK signaling, and bidirectional SDA. It supports standard-mode (100 kHz) and fast-mode (400 kHz) speeds depending on VCC level, and includes Schmitt-triggered, filtered inputs to ensure robust operation in electrically noisy environments.
AT34C02N-10SC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT34C02N-10SC FAQ
1.How can I place an order for AT34C02N-10SC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02N-10SC 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-10SC reliable?
The price and inventory of AT34C02N-10SC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT34C02N-10SC is usually 5 days.
3.What payment methods are accepted for AT34C02N-10SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02N-10SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02N-10SC?
AT34C02N-10SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02N-10SC 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-10SC?
For technical support, including AT34C02N-10SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02N-10SC requirements.
6.How does Aetrix verify that AT34C02N-10SC is sourced from the original manufacturer or authorized distributors?
All AT34C02N-10SC 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-10SC meets industry standards.
7.What is the process for return or replacement of AT34C02N-10SC?
All AT34C02N-10SC units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02N-10SC, 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-10SC part is unused and in its original packaging.
Return procedure for AT34C02N-10SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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