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Microchip Technology AT34C02-10PI
- Part No.:
- AT34C02-10PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT34C02-10PI.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,453
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Product details
Overview
AT34C02-10PI 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 at 2.7V+, features 16-byte page writes, and delivers 1 million write cycles with 100-year data retention. It is widely used in industrial control systems for storing calibration data and configuration parameters.
For engineers reviewing the AT34C02-10PI datasheet, AT34C02-10PI pinout, AT34C02-10PI application, or AT34C02-10PI equivalent, key selection criteria include industrial temperature range (-40°C to +85°C), dual write-protection modes, 8-pin PDIP package compatibility, and guaranteed 10 ms max write cycle timing under all voltage conditions.
Technical Context
The AT34C02-10PI implements a standard two-wire (I²C-compatible) serial interface with Schmitt-triggered, noise-filtered SDA and SCL inputs. Its internal architecture includes an 8-bit address counter, device-address comparator (A0–A2), and dedicated write-protect circuitry that enforces irreversible software lock on addresses 00H–7FH when programmed.
Hardware write protection is controlled exclusively by the WP pin: tied to VCC it locks the full 2K array regardless of software state; tied to GND or floating enables conditional access based on software protection status. The device uses open-drain SDA with external pull-up and supports acknowledge polling during tWR to detect write completion.
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 - supports mixed-voltage system integration without level shifters |
| I²C Clock Frequency | Up to 400 kHz at 2.7V+ - enables fast configuration updates in real-time embedded systems |
| Write Cycle Time | Max 10 ms - deterministic timing allows precise host firmware scheduling of non-blocking operations |
| Endurance | 1 million write cycles - sufficient for daily recalibration over 27+ years of operation |
| Data Retention | 100 years at +25°C - ensures long-term reliability in unattended industrial deployments |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade environmental stress without derating |
Pinout & Package
AT34C02-10PI is supplied in an 8-pin PDIP (package code 8P3), with 0.300" body width and through-hole mounting. Pin 1 is marked by a notch or dot; leads are tin-lead plated per JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Device Address Inputs | Hard-wired inputs enabling up to eight AT34C02 devices on one I²C bus; no external pull-up/down required |
| SDA | Serial Data I/O | Open-drain bidirectional line - requires external pull-up; supports wire-OR with other I²C peripherals |
| SCL | Serial Clock Input | Positive-edge clock input for data latching; negative-edge for data output - defines I²C timing compliance |
| WP | Hardware Write Protect | Active-high enable: VCC = full-array lock; GND/floating = software-protection dependent operation |
| VCC | Power Supply | 2.7V–5.5V tolerant supply rail - powers internal charge pump and logic; no separate VPP needed |
| GND | Ground Reference | Common return path for all internal circuits and I/O; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Permanent Software Write Protection | Irreversible lock on first 1K bits (00H–7FH) after single command - prevents accidental or malicious overwrite of critical firmware parameters |
| Hardware Write Protect (WP) | Dedicated pin enables full-array lock independent of software state - supports fail-safe configuration lockdown during power-up or fault recovery |
| 16-byte Page Write Mode | Reduces I²C transaction overhead by writing up to 16 bytes per stop condition - cuts bus utilization by ~85% vs. byte-by-byte writes |
| Schmitt Trigger + Noise Filtering | Input hysteresis and digital filtering suppress >100 ns glitches - eliminates false start/stop detection in electrically noisy PLC or motor drive environments |
| Industrial Temperature Range | Guaranteed operation from -40°C to +85°C - validated across thermal cycling and extended burn-in - suitable for DIN-rail mounted controllers |
Applications
| Industrial Sensor Calibration | PLC Configuration Storage |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog input modules in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with write-once-per-lifetime calibration data and runtime-read-only access. Use Value: Ensures traceable, tamper-resistant calibration records survive power loss and firmware updates without requiring external backup power. | Use Scenario: Holding user-defined I/O mapping, scan cycle time, and watchdog timeout settings in modular PLC backplanes. IC Role / Device Role / Timing Role: Configuration register bank accessed during boot and reconfiguration events; updated only during commissioning or maintenance. Use Value: Enables field-serviceable configuration persistence across firmware upgrades and hot-swap module replacement without manual reprogramming. |
| Medical Device Settings | Energy Meter Firmware Parameters |
Use Scenario: Retaining patient-specific therapy parameters and usage logs in portable infusion pumps operating under battery power. IC Role / Device Role / Timing Role: Low-power persistent memory supporting infrequent writes and high-reliability reads during therapy delivery. Use Value: Meets IEC 62304 Class C safety requirements via 1M endurance and 100-year retention - avoids data corruption risks of flash-based alternatives. | Use Scenario: Storing tariff tables, pulse constants, and meter ID in ANSI C12.20-compliant smart electricity meters deployed outdoors. IC Role / Device Role / Timing Role: Tamper-evident configuration vault with hardware-enforced write lock during active billing cycles. Use Value: WP pin tied to security microcontroller output enables dynamic full-array lock during revenue-critical intervals - prevents unauthorized parameter modification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DRMN6TP/K | 256 Kbit SPI interface; no software write protect; 5ms max write cycle; SO8 package only | Lacks dual write-protection architecture; requires SPI host interface instead of I²C | Select only if system already uses SPI peripherals and higher density is needed; not drop-in compatible |
| 24LC02BT-I/OT | 2 Kbit I²C EEPROM; no permanent software write protect; 5ms max write cycle; SOT-23-6 package | Hardware WP only; smaller footprint but no irreversible first-half lock capability | Choose for space-constrained designs where software-level protection is unnecessary and SOT-23 mounting is preferred |
Compared with M95256-DRMN6TP/K and 24LC02BT-I/OT, the AT34C02-10PI uniquely provides irreversible software write protection for half the array plus hardware WP for full-array lock - essential for safety-critical parameter segregation in industrial firmware architectures.
Availability
AT34C02-10PI is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and smart energy metering requiring stable component supply across extended product lifecycles.
Supply support for AT34C02-10PI 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 components, and secure authentication ICs, with deep expertise in embedded control and nonvolatile memory solutions.
The AT34C02-10PI belongs to Microchip's legacy serial EEPROM product line, designed specifically for industrial and automotive applications demanding robust data integrity, dual-layer write protection, and extended temperature operation.
FAQ
What is the maximum I²C clock frequency supported by the AT34C02-10PI?
The AT34C02-10PI supports up to 400 kHz I²C clock frequency when operated at 2.7V or higher. At 1.8V operation (not applicable to AT34C02-10PI), the maximum is reduced to 100 kHz. This 400 kHz capability enables faster configuration writes in time-sensitive industrial control loops while maintaining full compatibility with standard I²C controllers. The AT34C02-10PI meets all timing requirements defined in the Philips I²C specification for fast-mode operation.
Does the AT34C02-10PI require an external VPP programming voltage?
No, the AT34C02-10PI does not require an external VPP voltage. It uses an internal charge pump powered solely from the VCC supply (2.7V–5.5V) to generate the high voltage needed for EEPROM cell programming. This eliminates the need for additional power rails or voltage translators, simplifying board design and reducing BOM cost. All write operations for the AT34C02-10PI are executed using only the standard I²C interface and main supply.
How is the software write protection enabled on the AT34C02-10PI?
Software write protection on the AT34C02-10PI is enabled by sending a special device address (0110xxxx) followed by any data byte while the WP pin is held low or floating. This action permanently programs the write-protect register, locking addresses 00H–7FH. Once set, this protection cannot be reversed - even after power cycling. The AT34C02-10PI will no longer acknowledge subsequent 0110 control byte attempts, confirming irreversible activation.
Can the AT34C02-10PI be used in automotive applications?
The AT34C02-10PI is rated for industrial temperature (-40°C to +85°C) and is not AEC-Q200 qualified. While it may function in some automotive cabin environments, Microchip does not certify or guarantee its use in automotive powertrain or safety-critical systems. For automotive applications, engineers should select the automotive-grade variant AT34C02-10PA (or equivalent qualified part) instead of the AT34C02-10PI to ensure compliance with vibration, ESD, and thermal stress requirements.
What happens if a write command is issued to a protected address in the AT34C02-10PI?
If a write command targets an address locked by either software or hardware protection, the AT34C02-10PI will still acknowledge the device address and data byte transmission, but it will not store the data. The internal write cycle timer (tWR = 10 ms max) still executes, consuming time without effect. Host firmware must verify protection status via acknowledge polling or register read before initiating writes - a behavior consistently observed across all AT34C02-10PI operations.
AT34C02-10PI 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT34C02-10PI FAQ
1.How can I place an order for AT34C02-10PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02-10PI 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 reliable?
The price and inventory of AT34C02-10PI 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 is usually 5 days.
3.What payment methods are accepted for AT34C02-10PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02-10PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02-10PI?
AT34C02-10PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02-10PI 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?
For technical support, including AT34C02-10PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02-10PI requirements.
6.How does Aetrix verify that AT34C02-10PI is sourced from the original manufacturer or authorized distributors?
All AT34C02-10PI 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 meets industry standards.
7.What is the process for return or replacement of AT34C02-10PI?
All AT34C02-10PI units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02-10PI, 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 part is unused and in its original packaging.
Return procedure for AT34C02-10PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT34C02-10PI Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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AT24C08C-STUM-T
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