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Microchip Technology AT34C02-10TC
- Part No.:
- AT34C02-10TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT34C02-10TC.pdf
- Description:
- IC EEPROM 2KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,459
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Product details
Overview
AT34C02-10TC 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-lead TSSOP package. It is used for configuration storage in industrial controllers and embedded power management systems.
For engineers reviewing the AT34C02-10TC datasheet, AT34C02-10TC pinout, AT34C02-10TC application, or AT34C02-10TC equivalent, key selection considerations include its dual write-protection architecture, 2.7V–5.5V supply range, 400 kHz I²C speed at ≥2.7V, TSSOP-8 package footprint, and guaranteed endurance/reliability for mission-critical nonvolatile storage.
Technical Context
The AT34C02-10TC implements a standard two-wire (I²C-compatible) serial interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. Its internal address counter supports current-address, random-address, and sequential read modes, while the device address uses fixed 1010b prefix plus A2–A0 pins for up to eight devices on one bus.
Write protection is implemented through two independent mechanisms: irreversible software locking of addresses 00H–7FH (first 1K bits), and hardware-level array-wide protection controlled by the WP pin-active high (VCC) for full-array lock, low/floating for conditional access based on software state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2048 bits (256 × 8), organized as 256 bytes for direct byte/page addressing |
| Supply Voltage Range | 2.7V to 5.5V - enables interoperability with 3.3V and 5V microcontrollers without level-shifting |
| I²C Clock Frequency | 400 kHz max at VCC ≥ 2.7V - supports fast configuration updates in real-time systems |
| Write Cycle Time | 10 ms max - defines minimum interval between write commands; impacts firmware polling design |
| Endurance | 1 million write cycles - ensures long-term reliability in logging or calibration update applications |
| Data Retention | 100 years at +25°C - guarantees persistent storage across product lifecycle without refresh |
| ESD Protection | >3000V HBM - provides robustness against handling and board-level ESD events |
Pinout & Package
AT34C02-10TC is housed in an 8-lead TSSOP (Thin Shrink Small Outline Package), 0.170" wide, with 0.65 mm pitch and exposed pad not present. Pin 1 is marked by a beveled corner or dot; the package is RoHS-compliant and rated for commercial temperature range (0°C to +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hard-wired address bits enabling up to eight AT34C02-10TC devices on a single I²C bus |
| SDA | Serial Data I/O | Open-drain bidirectional line for data transfer; requires external pull-up resistor |
| SCL | Serial Clock Input | Master-generated clock signal; timing must meet tLOW/tHIGH min/max per AC specs |
| WP | Hardware Write Protect | Active-high control: VCC locks entire array; GND/floating enables software-protection mode |
| VCC | Power Supply | 2.7V–5.5V input; decoupling capacitor recommended near pin for noise immunity |
| GND | Ground Reference | System common return path; must be low-impedance to support stable I²C signaling |
Key Features
| Feature | Design Value |
|---|---|
| Permanent Software Write Protection | Irreversibly locks first 1K bits (00H–7FH); prevents accidental overwrites of critical boot/config data |
| Hardware Write Protect (WP pin) | Enables system-level lock of full 2K array during power-up or fault conditions via external logic |
| 16-byte Page Write Mode | Reduces firmware overhead and bus occupancy vs. byte-by-byte writes; improves update efficiency |
| Self-timed Write Cycle | Eliminates need for external timing control; firmware can poll ACK to detect completion |
| Schmitt Trigger & Noise Filtering | Ensures reliable I²C operation in electrically noisy industrial environments without external filtering |
Applications
| Industrial PLC Configuration Storage | Smart Meter Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, scaling factors, and alarm thresholds in programmable logic controllers subject to frequent field updates. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via I²C during startup and maintenance mode. Use Value: Dual write protection prevents corruption of factory-set parameters while allowing user-modifiable settings to be updated safely. | Use Scenario: Retaining meter-specific calibration coefficients and tamper-event logs across power cycles in utility-grade electricity meters. IC Role / Device Role / Timing Role: Secure, long-life data logger with deterministic 10 ms write latency and 100-year retention. Use Value: Guarantees regulatory compliance and metrological integrity over 20+ year field deployment without data loss. |
| Medical Device Setup Parameters | Automotive Body Control Module Settings |
Use Scenario: Saving user-selectable therapy profiles, alarm limits, and language preferences in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-power, ESD-hardened EEPROM interfaced to ARM Cortex-M host MCU via I²C. Use Value: >3000V HBM rating and 2.7V operation ensure safe integration into battery-powered medical systems with strict safety margins. | Use Scenario: Holding door lock logic states, mirror position memory, and lighting configuration in automotive BCMs. IC Role / Device Role / Timing Role: Automotive-qualified serial EEPROM supporting CAN-linked diagnostics and reprogramming. Use Value: Hardware WP pin allows ECU firmware to disable all writes during CAN flash operations, preventing race conditions. |
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, no software write protect, 5ms write cycle, SO8 package | Requires SPI host interface; lacks dual-protection architecture; higher density but less secure for config storage | Select when SPI interface is preferred and full-array hardware protection suffices |
| 24LC024T-I/OT | 2 Kbit I²C EEPROM, no permanent software write protect, 5ms write cycle, SOT23-6 package | Smaller footprint but missing irreversible first-half lock; lower ESD rating (4kV vs. 3kV) | Choose for space-constrained designs where software-level protection is managed externally |
Compared with M95256-WMN6TP and 24LC024T-I/OT, the AT34C02-10TC uniquely combines permanent first-half software write protection with hardware WP control, making it optimal for applications requiring layered security for critical configuration data - especially where I²C is mandated and long-term data integrity is non-negotiable.
Availability
AT34C02-10TC is available at Aetrix Electronics and suitable for industrial automation, smart energy metering, and medical device manufacturing requiring stable component supply, long-lifecycle support, and guaranteed commercial-temperature performance.
Supply support for AT34C02-10TC 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 reliability, longevity, and embedded system integration.
The AT34C02-10TC belongs to Microchip's legacy serial EEPROM product line, designed specifically for secure, low-voltage, long-life nonvolatile storage in industrial and commercial control systems where data integrity and write-protection flexibility are essential.
FAQ
What is the operating voltage range for the AT34C02-10TC?
The AT34C02-10TC operates from 2.7V to 5.5V, supporting both 3.3V and 5V system rails without level translation. This range is explicitly defined in the ordering code "-2.7" suffix and confirmed in DC Characteristics tables. The device maintains full 400 kHz I²C functionality across this entire voltage window, unlike 1.8V variants which are limited to 100 kHz. AT34C02-10TC is not rated for operation below 2.7V.
Does the AT34C02-10TC support page writes, and what is the page size?
Yes, the AT34C02-10TC supports 16-byte page writes, allowing up to 16 sequential bytes to be written in a single I²C transaction. This reduces bus overhead and improves firmware efficiency compared to byte-wise writes. The page boundary is fixed at 16-byte intervals (e.g., addresses 00H–0FH form one page), and address roll-over occurs within the same page if more than 16 bytes are sent. AT34C02-10TC does not support partial-page writes beyond the initial 16-byte limit.
How does hardware write protection work on the AT34C02-10TC?
Hardware write protection on the AT34C02-10TC is controlled by the WP pin: when pulled high to VCC, it disables all write operations to the full 2K array regardless of software protection status. When WP is low or floating, write access depends on whether the software write protect register has been programmed. AT34C02-10TC's WP pin does not affect read operations and requires no external pull-up/down resistors in floating configuration.
Can the software write protection on the AT34C02-10TC be disabled after programming?
No, the software write protection on the AT34C02-10TC is permanent and irreversible once enabled. It locks the first 1K bits (addresses 00H–7FH) and remains active even after power cycling. The protection is set by writing to the 0110 control code, and the device will no longer acknowledge subsequent 0110 commands. AT34C02-10TC provides no mechanism-hardware, software, or command-based-to clear this setting.
What package type and lead count does the AT34C02-10TC use?
The AT34C02-10TC uses an 8-lead TSSOP (Thin Shrink Small Outline Package), designated as package code "8T", with 0.65 mm lead pitch and 0.170" body width. It is distinct from PDIP (8P3) and SOIC (8S1) variants. The TSSOP package is surface-mount compatible, RoHS-compliant, and specified for commercial temperature range (0°C to +70°C). AT34C02-10TC does not use QFN, DFN, or WLCSP packages.
AT34C02-10TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT34C02-10TC FAQ
1.How can I place an order for AT34C02-10TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02-10TC 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 AT34C02-10TC reliable?
The price and inventory of AT34C02-10TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT34C02-10TC is usually 5 days.
3.What payment methods are accepted for AT34C02-10TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02-10TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02-10TC?
AT34C02-10TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02-10TC 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 AT34C02-10TC?
For technical support, including AT34C02-10TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02-10TC requirements.
6.How does Aetrix verify that AT34C02-10TC is sourced from the original manufacturer or authorized distributors?
All AT34C02-10TC 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 AT34C02-10TC meets industry standards.
7.What is the process for return or replacement of AT34C02-10TC?
All AT34C02-10TC units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02-10TC, 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 AT34C02-10TC part is unused and in its original packaging.
Return procedure for AT34C02-10TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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