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Microchip Technology AT34C02N-10SC-2.7
- Part No.:
- AT34C02N-10SC-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT34C02N-10SC-2.7.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,645
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Product details
Overview
AT34C02N-10SC-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) 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 writes, and delivers 1 million write cycles with 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-10SC-2.7 datasheet, AT34C02N-10SC-2.7 pinout, AT34C02N-10SC-2.7 application, or AT34C02N-10SC-2.7 equivalent, this page provides verified electrical specifications, validated 8-lead SOIC package details, confirmed I²C timing behavior at 2.7V operation, exact write-protection logic states, and real-world use cases in automotive body controllers and medical sensor modules.
Technical Context
The AT34C02N-10SC-2.7 implements a true 2-wire (I²C-compatible) interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. Its internal architecture includes an 8-bit address counter, page-addressable EEPROM array, and dual-layer write protection: irreversible software lock for addresses 00H–7FH and pin-controlled hardware lock for full-array protection when WP = VCC.
It uses open-drain bidirectional SDA with ACK polling support, supports byte and 16-byte page writes with self-timed 10 ms max write cycle, and maintains functional operation across -40°C to +85°C (industrial grade). The device responds to standard 7-bit I²C address format (1010 A2 A1 A0 R/W) and accepts 0110 control code for write-protect register access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2048 bits (256 × 8), organized as 256 individually addressable bytes |
| Supply Voltage Range | 2.7V to 5.5V - enables direct interface with 3.3V microcontrollers without level shifting |
| I²C Clock Frequency | 400 kHz maximum at VCC ≥ 2.7V - supports high-speed configuration updates in real-time systems |
| Write Cycle Time | 10 ms maximum - defines minimum interval between successive write commands |
| Endurance | 1,000,000 write cycles - ensures reliable field recalibration over product lifetime |
| Data Retention | 100 years at 25°C - guarantees long-term storage of critical calibration constants |
| ESD Protection | >3000 V HBM - provides robust handling during board assembly and field service |
Pinout & Package
AT34C02N-10SC-2.7 is housed in an 8-lead JEDEC SOIC package (package code 8S1), 3.9 mm × 4.9 mm footprint, 1.75 mm height, gull-wing leads, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hard-wired inputs enabling up to eight AT34C02 devices on one I²C bus (1010 A2 A1 A0 R/W format) |
| SDA | Serial Data I/O | Open-drain bidirectional line - requires external pull-up; supports wire-OR with other I²C devices |
| SCL | Serial Clock Input | Positive-edge clock input for data-in; negative-edge clock output for data-out; filtered for noise immunity |
| WP | Hardware Write Protect | Active-high enable: WP = VCC locks entire array; WP = GND/floating enables software protection mode |
| VCC | Power Supply | 2.7V–5.5V supply input - powers internal charge pump and logic; decoupling capacitor required |
| GND | Ground Reference | Return path for all internal circuits and I/O; 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 factory calibration data |
| Hardware Write Protect Pin (WP) | Single-pin full-array lock independent of software state - enables system-level write disable during power-up or fault conditions |
| 16-byte Page Write Mode | Reduces I²C transaction overhead by writing up to 16 bytes per stop condition - cuts configuration time by ~85% vs. byte writes |
| Schmitt Trigger + Noise Filtering | Eliminates false start/stop detection on noisy industrial buses - improves reliability in motor-drive or power-conversion environments |
| ACK Polling Support | Allows host MCU to detect write completion without fixed delay - enables deterministic timing in time-critical firmware updates |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
Use Scenario: Storing temperature-compensation coefficients and sensor offset values during factory calibration of pressure transducers. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed once per power cycle during sensor initialization sequence. Use Value: Enables field-replaceable sensors to retain calibrated performance without reprogramming - reduces service downtime and recalibration cost. |
Use Scenario: Holding door-lock actuator timing profiles and mirror-position presets in vehicle body control units. IC Role / Device Role / Timing Role: I²C-configurable memory updated only during dealer programming or user preference setup. Use Value: Survives battery disconnects and supports 100+ year data retention - eliminates need for backup capacitors or supercaps. |
| Medical Diagnostic Equipment | Smart Energy Metering |
Use Scenario: Recording last-known operating parameters (e.g., gain settings, filter coefficients) before shutdown in portable ultrasound devices. IC Role / Device Role / Timing Role: Low-power standby-mode memory accessed during boot to restore signal chain configuration. Use Value: 0.6 µA standby current at 1.8V allows multi-year battery life in handheld diagnostics - meets IEC 62304 Class C requirements. |
Use Scenario: Storing tariff schedules, metering thresholds, and tamper-event logs in DIN-rail electricity meters. IC Role / Device Role / Timing Role: Secure, write-protected storage for regulatory-critical billing data updated infrequently but requiring high integrity. Use Value: Hardware WP pin enables firmware-level lock during metrology certification - prevents unauthorized parameter modification post-calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip 24LC02BT-I/SN | Same 2 Kbit size, SOIC-8, 2.5V–5.5V range; no permanent software write protection; only hardware WP pin | Lacks irreversible first-half lock - unsuitable where factory calibration must survive all field updates | Select when full-array hardware protection suffices and software lock is unnecessary |
| ON Semiconductor CAT24C02WI-GT3 | 2 Kbit, SOIC-8, 1.7V–5.5V; includes software write protect but not permanent - can be disabled via WP pin state | Reversible software lock allows field recalibration; lower ESD rating (2 kV HBM vs. 3 kV) | Choose for applications requiring periodic recalibration and wider voltage flexibility down to 1.7V |
Compared with AT34C02N-10SC-2.7, the 24LC02BT offers simpler protection but no irreversible lock, while the CAT24C02WI supports lower voltage operation but trades permanent security for field update flexibility - making AT34C02N-10SC-2.7 optimal for safety-critical calibration storage where data immutability is mandatory.
Availability
AT34C02N-10SC-2.7 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device manufacturing requiring stable component supply, long-lifecycle assurance, and guaranteed traceability.
Supply support for AT34C02N-10SC-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 broad industrial and automotive qualification coverage.
The AT34C02 series was designed specifically for robust, low-voltage I²C-based configuration storage in harsh environments - emphasizing write-protection integrity, extended temperature operation, and noise-immune serial interface reliability.
FAQ
What voltage range does the AT34C02N-10SC-2.7 support, and how does it affect I²C speed?
The AT34C02N-10SC-2.7 operates from 2.7V to 5.5V. At VCC ≥ 2.7V, it supports up to 400 kHz I²C clock frequency; below 2.7V (e.g., 1.8V variants), maximum speed drops to 100 kHz. This voltage-speed dependency is defined in its AC characteristics table and directly impacts configuration throughput in battery-powered systems using the AT34C02N-10SC-2.7.
How does the permanent software write protection work in the AT34C02N-10SC-2.7?
The AT34C02N-10SC-2.7 implements irreversible software write protection for addresses 00H–7FH. Once enabled via the 0110 control code (with WP = GND/floating), the lock cannot be cleared - even after power cycles. The device stops acknowledging write attempts to that region, ensuring factory calibration data remains unaltered throughout the product's lifetime.
Can the AT34C02N-10SC-2.7 be used with a 1.8V microcontroller I²C interface?
No - the AT34C02N-10SC-2.7 is the 2.7V variant and requires VCC ≥ 2.7V. For 1.8V systems, Microchip offers the AT34C02N-10SC-1.8, which supports 1.8V–5.5V operation and 100 kHz I²C. Using AT34C02N-10SC-2.7 with a 1.8V I²C bus risks undervoltage operation, failed ACKs, and unreliable communication.
What is the purpose of the WP pin on the AT34C02N-10SC-2.7, and how does it interact with software protection?
The WP pin on the AT34C02N-10SC-2.7 enables hardware-level full-array write protection when pulled to VCC. It overrides software protection: if WP = VCC, no writes succeed anywhere in memory - regardless of software lock status. If WP = GND/floating, software protection behavior applies. This dual-layer scheme allows flexible, hierarchical data security in the AT34C02N-10SC-2.7.
Does the AT34C02N-10SC-2.7 support page writes, and what is the maximum page size?
Yes - the AT34C02N-10SC-2.7 supports 16-byte page writes. When initiating a write, the host sends the starting address and up to 16 sequential bytes before issuing a STOP condition. Internal address incrementing wraps within the same page boundary, preventing cross-page corruption. This capability significantly accelerates bulk configuration updates in the AT34C02N-10SC-2.7 compared to single-byte writes.
AT34C02N-10SC-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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT34C02N-10SC-2.7 FAQ
1.How can I place an order for AT34C02N-10SC-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02N-10SC-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-10SC-2.7 reliable?
The price and inventory of AT34C02N-10SC-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-10SC-2.7 is usually 5 days.
3.What payment methods are accepted for AT34C02N-10SC-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02N-10SC-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02N-10SC-2.7?
AT34C02N-10SC-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02N-10SC-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-10SC-2.7?
For technical support, including AT34C02N-10SC-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02N-10SC-2.7 requirements.
6.How does Aetrix verify that AT34C02N-10SC-2.7 is sourced from the original manufacturer or authorized distributors?
All AT34C02N-10SC-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-10SC-2.7 meets industry standards.
7.What is the process for return or replacement of AT34C02N-10SC-2.7?
All AT34C02N-10SC-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02N-10SC-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-10SC-2.7 part is unused and in its original packaging.
Return procedure for AT34C02N-10SC-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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