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Microchip Technology AT34C02CN-SH-T
- Part No.:
- AT34C02CN-SH-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT34C02CN-SH-T.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,394
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Product details
Overview
AT34C02CN-SH-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 (1.7V) and 400 kHz (2.7V/5.0V) I²C-compatible communication, 16-byte page writes, and operates across –40°C to +85°C for industrial embedded systems requiring nonvolatile parameter storage.
For engineers reviewing the AT34C02CN-SH-T datasheet, AT34C02CN-SH-T pinout, AT34C02CN-SH-T application, or AT34C02CN-SH-T equivalent, this device serves as a low-voltage, high-reliability serial EEPROM for firmware configuration, calibration data retention, and system ID storage - with critical attention to WP pin behavior, software write-protect register programming sequence, and page-boundary rollover during write operations.
Technical Context
The AT34C02CN-SH-T implements a two-wire (I²C-compatible) serial interface with open-drain SDA and Schmitt-triggered SCL inputs for noise immunity. Its memory array is internally organized as 16 pages of 16 bytes each, supporting byte and page write modes with self-timed 5 ms max write cycles.
Write protection is implemented via three independent mechanisms: hardware-level inhibition via the WP pin (GND = enabled, VCC = full-array lock), permanent software write protection (irreversible, locks addresses 00H–7FH), and reversible software write protection (programmable and clearable via specific command sequences using VHV voltage on A0).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2048 bits (256 × 8), organized as 16 pages × 16 bytes - enables compact firmware parameter storage with efficient page-write throughput. |
| Supply voltage range | 1.7 V to 5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifting. |
| Interface speed | 100 kHz at 1.7 V; 400 kHz at 2.7 V and 5.0 V - ensures compatibility with legacy and modern I²C buses while maintaining timing margin at low voltage. |
| Write endurance | 1 million write cycles - guarantees long-term reliability in applications requiring frequent calibration updates or event logging. |
| Data retention | 100 years at +25°C - ensures persistent storage of critical device identity, calibration coefficients, or security keys over product lifetime. |
| Operating temperature | –40°C to +85°C - qualified for industrial environments including automotive body control modules and industrial sensors. |
| Standby current | 0.6 µA at 1.7 V - minimizes power consumption in battery-backed or energy-harvesting systems. |
Pinout & Package
AT34C02CN-SH-T is packaged in an 8-lead JEDEC SOIC (8S1) with gull-wing leads, 0.150" wide body, and NiPdAu lead finish (lead-free/halogen-free). Pin 1 is marked by a notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hardware device address inputs | Enable up to eight AT34C02CN-SH-T devices on one I²C bus; pulled down internally if floating, but external tie-off recommended to avoid capacitive coupling errors. |
| SDA | Serial data bidirectional I/O | Open-drain output with internal pull-up not provided - requires external pull-up resistor (typically 10 kΩ); supports wire-OR with other I²C devices. |
| SCL | Serial clock input | Schmitt-triggered input with 100 ns noise suppression - tolerates noisy industrial environments without external filtering. |
| WP | Hardware write protect control | Active-high: VCC connection disables all writes (full array); GND or floating enables software-controlled protection modes - must be tied to known state per design guidance. |
| VCC | Power supply | Accepts 1.7–5.5 V; decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin for stable low-voltage operation. |
| GND | Ground reference | Common return path for VCC, SDA, SCL, and WP - must be low-impedance and routed away from noisy digital traces. |
Key Features
| Feature | Design Value |
|---|---|
| Permanent software write protection | Irreversibly locks first-half array (00H–7FH) after single command - prevents accidental or malicious overwrite of critical boot parameters or factory calibration data. |
| Reversible software write protection | Enables and clears first-half protection via dedicated VHV-assisted command sequences - allows field-upgradable secure storage with controlled access windows. |
| Hardware write protection (WP pin) | Physically disables all write operations when tied to VCC - provides fail-safe protection independent of firmware state or power sequencing. |
| 16-byte page write mode | Reduces I²C transaction overhead by up to 16× vs. byte writes - accelerates bulk configuration updates (e.g., sensor offset tables) while respecting page boundaries. |
| Self-timed write cycle (5 ms max) | Eliminates need for external write-complete polling delay - simplifies host firmware and enables deterministic timing in real-time systems. |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing temperature-compensated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with write-protection enforced during normal operation to prevent corruption during brown-out or reset events. Use Value: Ensures measurement accuracy remains traceable across 100-year data retention and 1M write cycles, even under repeated thermal cycling. |
Use Scenario: Retaining user-selected therapy profiles and safety-critical alarm thresholds in portable infusion pumps. IC Role / Device Role / Timing Role: Secure configuration vault where WP pin is hardwired to VCC during production test, and software protection guards initial setup data. Use Value: Meets IEC 62304 Class C software requirements by preventing runtime modification of life-sustaining parameters. |
| Automotive Body Control Module | Smart Energy Metering |
Use Scenario: Recording door lock actuation count, window position limits, and mirror memory settings in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced directly to 3.3 V MCU I²C bus; uses 1.7 V operation to maintain functionality during cranking dips. Use Value: Guarantees reliable storage across –40°C to +125°C junction temperature with <0.6 µA standby current to minimize parasitic drain. |
Use Scenario: Storing tariff schedules, meter serial number, and tamper-event logs in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: High-reliability data logger with permanent software write protection applied to metrology constants post-calibration. Use Value: Achieves 100-year data integrity for regulatory audit trails and eliminates risk of unauthorized parameter alteration via physical WP pin control. |
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-SSH-T | Direct successor with identical pinout, voltage range, and memory map; adds enhanced ESD robustness (4 kV HBM) and updated qualification per AEC-Q200 Grade 2. | Required for new designs targeting automotive qualification or extended reliability; not drop-in in legacy systems lacking ESD margin review. | Select AT34C02D-SSH-T for new industrial or automotive designs; verify layout clearance for higher ESD immunity. |
| STMicroelectronics M24C02-RMN6TP | 2 Kbit I²C EEPROM with same 1.7–5.5 V range and 400 kHz speed, but only hardware write protection (no software WP registers) and no VHV-based reversible protection. | Suitable where simplified protection suffices (e.g., consumer IoT), but cannot replicate AT34C02CN-SH-T's dual-layer (hardware + software) security model. | Choose M24C02-RMN6TP only when software write protection features are unnecessary and cost optimization is primary. |
Compared with AT34C02D-SSH-T, the AT34C02CN-SH-T lacks AEC-Q200 qualification and has lower ESD tolerance, making it suitable for legacy industrial use but not new automotive programs; versus M24C02-RMN6TP, it offers superior data security through irreversible and reversible software write protection - critical for regulated or safety-critical deployments.
Availability
AT34C02CN-SH-T is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply and long-term obsolescence management.
Supply support for AT34C02CN-SH-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 AT34C02 family. The company specializes in microcontrollers, analog, and memory solutions for industrial, automotive, and aerospace markets.
The AT34C02 series was designed specifically for robust, low-voltage serial EEPROM applications demanding multi-layer write protection, extended data retention, and seamless integration into resource-constrained embedded systems.
FAQ
What is the operating voltage range of the AT34C02CN-SH-T?
The AT34C02CN-SH-T operates from 1.7 V to 5.5 V, enabling direct interface with 1.8 V, 3.3 V, and 5 V microcontrollers without level-shifting circuitry. This wide range supports stable read/write functionality during brown-out conditions and across diverse power domains in mixed-voltage systems. The AT34C02CN-SH-T maintains full I²C timing compliance at both 100 kHz (1.7 V) and 400 kHz (2.7 V/5.0 V).
How does hardware write protection work on the AT34C02CN-SH-T?
Hardware write protection on the AT34C02CN-SH-T is controlled by the WP pin: when tied to VCC, all write operations (including software write-protect register programming) are disabled for the entire 2 Kbit array. When WP is grounded or left floating (internally pulled down), software-based protection modes become active. The AT34C02CN-SH-T datasheet explicitly warns against leaving WP floating due to capacitive coupling risks, recommending explicit tie-off with ≤10 kΩ resistors.
Can the AT34C02CN-SH-T perform page writes, and what is the page size?
Yes, the AT34C02CN-SH-T supports 16-byte page writes, matching its internal organization of 16 pages × 16 bytes. During a page write, up to 16 sequential bytes can be loaded in a single I²C transaction before issuing a STOP condition. The AT34C02CN-SH-T automatically increments the lower 4 address bits; exceeding the page boundary causes rollover to the start of the same page - a behavior that must be managed in host firmware to avoid unintended overwrites.
What is the difference between permanent and reversible software write protection on the AT34C02CN-SH-T?
Permanent software write protection on the AT34C02CN-SH-T, once enabled via a 0110xxxx command with WP low, irreversibly locks addresses 00H–7FH and cannot be cleared - even after power cycling. Reversible software write protection uses VHV voltage (7–10 V) on A0 to program or clear the same address range via distinct command sequences (01100010 to set, 01100110 to clear). Both require WP = GND during programming and are validated by ACK/NACK response per the AT34C02CN-SH-T specification.
Is the AT34C02CN-SH-T still recommended for new designs?
No - the AT34C02CN-SH-T is Not Recommended for New Design (NRND), as stated in revision E (March 2011) and reaffirmed in revision F (October 2014) of its datasheet. Microchip recommends migrating to the AT34C02D-SSH-T, which offers identical functionality plus enhanced ESD robustness and AEC-Q200 Grade 2 qualification. However, the AT34C02CN-SH-T remains fully supported for existing production and legacy industrial programs with verified supply chain continuity.
AT34C02CN-SH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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-SOIC
AT34C02CN-SH-T FAQ
1.How can I place an order for AT34C02CN-SH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02CN-SH-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 AT34C02CN-SH-T reliable?
The price and inventory of AT34C02CN-SH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT34C02CN-SH-T is usually 5 days.
3.What payment methods are accepted for AT34C02CN-SH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02CN-SH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02CN-SH-T?
AT34C02CN-SH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02CN-SH-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 AT34C02CN-SH-T?
For technical support, including AT34C02CN-SH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02CN-SH-T requirements.
6.How does Aetrix verify that AT34C02CN-SH-T is sourced from the original manufacturer or authorized distributors?
All AT34C02CN-SH-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 AT34C02CN-SH-T meets industry standards.
7.What is the process for return or replacement of AT34C02CN-SH-T?
All AT34C02CN-SH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02CN-SH-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 AT34C02CN-SH-T part is unused and in its original packaging.
Return procedure for AT34C02CN-SH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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