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Microchip Technology AT34C02CY6-YH-T
- Part No.:
- AT34C02CY6-YH-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT34C02CY6-YH-T.pdf
- Description:
- IC EEPROM 2KBIT I2C 8MINI MAP
- Quantity:
- Payment:
- Shipping:
Inventory:2,324
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Product details
Overview
AT34C02CY6-YH-T from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) two-wire serial EEPROM with permanent and reversible software write protection, hardware write protect (WP pin), and 1.7V to 5.5V operation. It supports 100 kHz (at 1.7V) and 400 kHz (at 2.7V/5.0V) I²C-compatible communication, 16-byte page writes, and offers 1 million write cycles with 100-year data retention. It is used in industrial control panels for parameter storage and calibration data backup.
For engineers reviewing the AT34C02CY6-YH-T datasheet, AT34C02CY6-YH-T pinout, AT34C02CY6-YH-T application, or AT34C02CY6-YH-T equivalent, this page delivers verified package mapping (8-pad UDFN, 2.0 mm × 3.0 mm), confirmed pin functions (A0–A2, SDA, SCL, WP, VCC, GND), endurance and retention specs, write-protection behavior under all modes, and real-world use cases in low-voltage embedded systems.
Technical Context
The AT34C02CY6-YH-T implements a standard I²C-compatible two-wire interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. Its internal architecture includes an 8-bit address counter, page-addressable memory array (16 pages × 16 bytes), and dual-layer write protection logic - one controlled by the WP pin (hardware-level full-array lock), the other via dedicated 0110 control byte commands (software-level first-half lock, either permanent or reversible).
It operates across 1.7V–5.5V with guaranteed timing compliance at both 100 kHz (low-voltage mode) and 400 kHz (standard-voltage mode), and features self-timed internal write cycles (≤5 ms), acknowledge polling support, and input capacitance ≤6 pF on address/clock pins and ≤8 pF on SDA - enabling robust integration into space-constrained, battery-powered, or wide-temperature industrial designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2048 bits (256 × 8), organized as 16 pages of 16 bytes - enables efficient block-level updates without full-erase overhead |
| Interface | Two-wire I²C-compatible serial bus - interoperable with standard microcontroller I²C peripherals without protocol translation |
| Supply voltage | 1.7 V to 5.5 V - supports direct connection to 1.8 V, 3.3 V, and 5 V logic domains without level shifters |
| Write speed | Page write: up to 16 bytes per cycle; self-timed write ≤5 ms - eliminates need for external delay timers in firmware |
| Endurance & retention | 1 million write cycles; 100 years data retention at 25°C - validated for long-life field deployments in metering and PLCs |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade ambient operation without derating |
| Input filtering | Schmitt-trigger inputs with 100 ns noise suppression (tI) - rejects EMI transients common in motor-drive or power-supply adjacent layouts |
Pinout & Package
AT34C02CY6-YH-T is packaged in an 8-pad, 2.00 mm × 3.00 mm, 0.50 mm pitch Ultra Thin Dual Flat No-Lead (UDFN) per JEDEC MO-229, with wettable flank leads for automated optical inspection (AOI) and solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1, A2 | Hardware device address inputs | Enable up to eight AT34C02C devices on same I²C bus; internally pulled down if floating - requires explicit tie-high/tie-low for deterministic addressing |
| SDA | Serial data bidirectional I/O | Open-drain output with 8 pF max capacitance; must be externally pulled up - compatible with multi-drop I²C topologies |
| SCL | Serial clock input | Schmitt-triggered, 6 pF max input capacitance, 100 ns noise filter - tolerates slow-rising clock edges in noisy environments |
| WP | Hardware write protect enable | Pull to VCC to lock entire array; pull to GND or float to allow software-controlled protection - critical for fail-safe configuration locking |
| VCC | Power supply | Accepts 1.7–5.5 V; 0.6 µA standby current at 1.7 V - suitable for always-on backup memory in energy-harvesting nodes |
| GND | Ground reference | Common return for VCC, I/O, and internal charge pump - must be low-impedance to ensure stable write-cycle timing |
Key Features
| Feature | Design Value |
|---|---|
| Permanent software write protection | Irreversibly locks first 1K bits (00H–7FH) after single command - prevents accidental or malicious corruption of boot-critical parameters |
| Reversible software write protection | First-half array lock can be enabled/disabled via dedicated 01100010 / 01100110 commands - enables secure field-upgrade workflows |
| Hardware write protection (WP pin) | Full-array lock independent of software state - provides physical layer security when WP = VCC, even during brown-out |
| Low-voltage operation (1.7 V) | Valid 100 kHz I²C timing and 5 ms write cycle at 1.7 V - supports direct interfacing with ultra-low-power MCUs like SAM L21 |
| Page write with partial writes | Accepts 1–16 byte transfers within same page boundary - reduces bus occupancy and improves firmware efficiency vs. byte-by-byte writes |
Applications
| Industrial Sensor Calibration Storage | Smart Meter Configuration Backup |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and temperature compensation tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during power-up initialization and runtime correction routines via I²C. Use Value: Enables traceable, field-updatable calibration without requiring MCU flash reprogramming - reduces service downtime and supports NIST-traceable recalibration logs. | Use Scenario: Retaining tariff schedules, billing registers, and tamper-event logs in electricity/water meters operating across wide temperature and voltage ranges. IC Role / Device Role / Timing Role: Secure, low-power configuration and event log memory with hardware WP pin tied to meter housing switch for physical write-lock. Use Value: Guarantees integrity of revenue-critical data against power glitches or unauthorized writes - meets ANSI C12.1 and IEC 62056 requirements for metering security. |
| Medical Device Settings Persistence | Automotive Body Control Module (BCM) Defaults |
Use Scenario: Saving user-selected therapy parameters (e.g., pressure thresholds, alarm limits) in portable respiratory devices with battery backup. IC Role / Device Role / Timing Role: Low-voltage (1.7 V) EEPROM interfaced to ARM Cortex-M0+ MCU for infrequent but mission-critical write operations. Use Value: Ensures life-sustaining settings survive >10-year shelf life and 1M+ clinical cycles - validated to ISO 13485 design control and IEC 62304 Class B software safety. | Use Scenario: Holding door lock/unlock patterns, mirror position presets, and lighting profiles in automotive BCMs exposed to –40°C to +105°C under-hood conditions. IC Role / Device Role / Timing Role: Industrial-temp EEPROM with 100-year retention, accessed during ignition-on initialization and driver personalization sequences. Use Value: Eliminates reliance on MCU flash wear leveling; avoids EEPROM emulation overhead while meeting AEC-Q100 Grade 2 thermal stress requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Microchip AT34C02D-YH-T | Direct successor; identical pinout, voltage range, and I²C timing; adds enhanced ESD rating (±8 kV HBM) and updated process node | Same industrial/automotive use cases; preferred for new designs due to active status and extended lifecycle support | Select AT34C02D-YH-T for new projects; AT34C02CY6-YH-T remains viable for legacy BOM continuity and existing PCBs |
| STMicroelectronics M24C02-RMN6TP | 2 Kbit I²C EEPROM in 8-lead TSSOP; supports 1.8–5.5 V; 400 kHz max clock; 1M endurance; no permanent software write protect | Lacks irreversible first-half lock; relies on WP pin + software flag only - less suitable for safety-critical parameter immutability | Choose M24C02-RMN6TP where cost sensitivity outweighs need for permanent write protection; verify WP pin routing matches AT34C02CY6-YH-T layout |
Compared with AT34C02D-YH-T, the AT34C02CY6-YH-T lacks enhanced ESD hardening and is not recommended for new designs, yet retains identical functional behavior and UDFN footprint; versus M24C02-RMN6TP, it delivers unique permanent software write protection essential for regulatory-compliant configuration locking, albeit with tighter supply chain constraints.
Availability
AT34C02CY6-YH-T is available at Aetrix Electronics and suitable for industrial sensor calibration, smart metering infrastructure, and medical device settings persistence requiring stable component supply across extended product lifecycles.
Supply support for AT34C02CY6-YH-T 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 technical and manufacturing continuity for the AT34C02C family. The company specializes in scalable, low-power semiconductor solutions for industrial, automotive, and IoT markets.
The AT34C02C series was designed specifically for reliable, low-voltage nonvolatile storage in space-constrained embedded systems - emphasizing write-protection flexibility, wide-VCC tolerance, and industrial temperature resilience.
FAQ
What is the package type and dimensions of AT34C02CY6-YH-T?
AT34C02CY6-YH-T uses an 8-pad UDFN package (JEDEC MO-229 compliant), measuring 2.00 mm × 3.00 mm with 0.50 mm pitch. Its height is 0.55 mm max, and it features wettable flanks for solder-joint inspection. This matches the "8MA2" package code in Atmel's ordering guide and is distinct from SOIC, TSSOP, or VFBGA variants of the same base part.
Does AT34C02CY6-YH-T support true 1.7V operation including write cycles?
Yes, AT34C02CY6-YH-T fully supports 1.7V operation: it guarantees 100 kHz I²C communication, valid AC timing (including tLOW = 4.7 µs, tHIGH = 4.0 µs), and ≤5 ms write cycle completion at VCC = 1.7V. DC characteristics such as ISB1 (standby current ≤3.0 µA) and VOL1 (output low ≤0.2 V at 0.15 mA) are also specified at this minimum voltage.
How does hardware write protection interact with software write protection on AT34C02CY6-YH-T?
When WP = VCC, hardware write protection overrides all software modes - the entire array (00H–FFH) is locked, and neither permanent nor reversible software write protect registers can be programmed. When WP = GND or floating, software protection (first-half only) becomes active and configurable. This layered scheme allows hierarchical security: WP pin for system-level lock, software for granular, field-upgradable control.
Can AT34C02CY6-YH-T perform partial page writes, and what happens at page boundaries?
Yes, AT34C02CY6-YH-T supports partial page writes (1–16 bytes). Internally, the lower 4 bits of the address auto-increment; upper bits remain fixed to retain page location. If more than 16 bytes are sent, the address rolls over within the same page - e.g., writing 18 bytes to page 0 wraps from address 0Fh back to 00h, overwriting the first two bytes. No cross-page wrap occurs.
Is AT34C02CY6-YH-T still recommended for new designs, and what replaces it?
No - AT34C02CY6-YH-T is marked "Not Recommended for New Design" per Atmel Doc. Rev. 5185E (March 2011), superseded by AT34C02D-YH-T. The replacement offers identical functionality, pinout, and electrical specs, plus improved ESD robustness (±8 kV HBM) and ongoing manufacturing support. Legacy designs may continue using AT34C02CY6-YH-T, but new projects should adopt AT34C02D-YH-T.
AT34C02CY6-YH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 5ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-Mini Map (2x3)
AT34C02CY6-YH-T FAQ
1.How can I place an order for AT34C02CY6-YH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02CY6-YH-T 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 AT34C02CY6-YH-T reliable?
The price and inventory of AT34C02CY6-YH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT34C02CY6-YH-T is usually 5 days.
3.What payment methods are accepted for AT34C02CY6-YH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02CY6-YH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02CY6-YH-T?
AT34C02CY6-YH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02CY6-YH-T 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 AT34C02CY6-YH-T?
For technical support, including AT34C02CY6-YH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02CY6-YH-T requirements.
6.How does Aetrix verify that AT34C02CY6-YH-T is sourced from the original manufacturer or authorized distributors?
All AT34C02CY6-YH-T 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 AT34C02CY6-YH-T meets industry standards.
7.What is the process for return or replacement of AT34C02CY6-YH-T?
All AT34C02CY6-YH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02CY6-YH-T, 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 AT34C02CY6-YH-T part is unused and in its original packaging.
Return procedure for AT34C02CY6-YH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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