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Microchip Technology AT34C02CN-SH-B
- Part No.:
- AT34C02CN-SH-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT34C02CN-SH-B.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,822
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Product details
Overview
AT34C02CN-SH-B 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 operates across –40°C to +85°C. It is used in industrial control systems for storing calibration data, configuration settings, and firmware parameters.
For engineers reviewing the AT34C02CN-SH-B datasheet, AT34C02CN-SH-B pinout, AT34C02CN-SH-B application, or AT34C02CN-SH-B equivalent, this page delivers verified electrical specs, JEDEC SOIC-8 package details, WP/SCL/SDA interface behavior, endurance (1 million cycles), and real-world write-protection mode interactions - all confirmed against Microchip's official AT34C02C datasheet (5185F).
Technical Context
The AT34C02CN-SH-B 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 (WP pin high disables all writes), permanent software (irreversible lock of first 1K bits), and reversible software (programmable/unprogrammable lock of 00H–7FH). All protection modes coexist and are validated by ACK/NACK responses during device addressing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2048 bits (256 × 8), organized as 16 pages × 16 bytes - enables efficient parameter storage without external address latches. |
| 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 shifters. |
| 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 masters under varying rail conditions. |
| Endurance & retention | 1 million write cycles; 100 years data retention - suitable for field-updatable calibration tables in industrial equipment. |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded applications including PLCs and sensor transmitters. |
| Write cycle time | Max 5 ms - defines minimum inter-write delay; ACK polling required to confirm completion before next command. |
| Input leakage current | ≤3.0 µA (VI/O = VCC or VSS) - minimizes standby power draw in battery-backed systems. |
Pinout & Package
AT34C02CN-SH-B is packaged in an 8-lead JEDEC SOIC (package code 8S1), with 150-mil body width and gull-wing leads. Pin 1 is marked by a beveled corner or notch; the package is lead-free and halogen-free (NiPdAu finish).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hardware device address inputs | Hardwired to GND/VCC to select one of eight possible addresses on shared I²C bus; floating defaults to GND but not recommended. |
| 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 sampled clock; Schmitt trigger input suppresses noise on long traces or noisy environments. |
| WP | Hardware write protect | Pulled high to VCC to disable all writes regardless of software protection state; pulled low or floating enables software control. |
| VCC | Power supply | Accepts 1.7–5.5 V; internal regulation enables stable EEPROM operation across wide input range. |
| GND | Ground reference | Return path for VCC and all I/O; must be low-impedance to ensure noise-immune SCL/SDA transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Permanent software write protect | Irreversibly locks first 1K bits (00H–7FH); prevents accidental or malicious overwrite of critical boot parameters. |
| Reversible software write protect | Allows runtime enable/disable of first-half protection via dedicated I²C commands (01100010 / 01100110), enabling secure field updates. |
| Hardware write protect (WP) | Physical pin-based lock of full 2K array; overrides all software protection - ideal for factory lockdown or safety-critical modes. |
| 16-byte page write mode | Reduces I²C transaction overhead vs. byte writes; supports partial-page writes without erasing adjacent bytes. |
| Noise-immune interface | Schmitt-triggered SCL and filtered inputs meet industrial EMC requirements; tI = 100 ns (1.7 V) / 50 ns (2.7 V+). |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing temperature-compensation coefficients and sensor offset values in a pressure transducer operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 100-year retention and 1M-cycle endurance for lifetime recalibration. Use Value: Eliminates need for external backup power or supercapacitors; WP pin enables factory-set calibration lock preventing field corruption. |
Use Scenario: Holding user-selectable therapy profiles and safety thresholds in a portable infusion pump certified to IEC 60601-1. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store with irreversible software lock for FDA-required safety parameters. Use Value: Permanent write protection ensures critical limits cannot be altered post-certification; reversible lock allows authorized service updates. |
| Smart Energy Metering | Automotive Body Control Module |
Use Scenario: Recording tariff schedules, meter ID, and tamper-event logs in a DIN-rail kWh meter deployed in utility substations. IC Role / Device Role / Timing Role: Low-power (0.6 µA standby at 1.7 V) serial EEPROM interfaced to an ARM Cortex-M0+ MCU via I²C. Use Value: 1.7 V operation enables direct connection to meter's 1.8 V logic rail; page writes reduce I²C bus occupancy during log updates. |
Use Scenario: Saving seat position memory, mirror presets, and lighting configurations in a vehicle BCM with 5 V supply and CAN/LIN connectivity. IC Role / Device Role / Timing Role: Robust nonvolatile storage tolerant of automotive load-dump transients (6.25 V abs max rating) and ESD events. Use Value: Hardware WP pin tied to ignition signal enables automatic write-disable during engine cranking; Schmitt-triggered SCL rejects ignition noise. |
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 | Successor device; identical 2 Kbit organization, same SOIC-8 package, but adds enhanced ESD protection (4 kV HBM) and extended 125°C operation option. | Qualified for automotive AEC-Q100 Grade 2 (–40°C to +105°C); supports higher ambient temperature zones like engine compartments. | Select AT34C02D-SSH-T for new designs requiring longer lifecycle support or extended temperature capability; AT34C02CN-SH-B remains valid for existing industrial PCBs. |
| STMicroelectronics M24C02-RMN6TP | 2 Kbit I²C EEPROM in same 8-lead TSSOP package; supports 1 MHz max clock (vs. 400 kHz), but lacks permanent software write protection. | Relies solely on WP pin and software lock (reversible only); no irreversible lock mechanism for safety-critical fields. | Choose M24C02-RMN6TP when higher-speed writes are needed and permanent protection is unnecessary; verify WP pin routing matches AT34C02CN-SH-B layout. |
Compared with AT34C02D-SSH-T, the AT34C02CN-SH-B offers proven industrial reliability but lacks AEC-Q100 qualification and enhanced ESD; versus M24C02-RMN6TP, it provides unique irreversible write protection essential for regulatory compliance in medical and energy metering.
Availability
AT34C02CN-SH-B is available at Aetrix Electronics and suitable for industrial control systems, medical device configuration storage, smart metering infrastructure, and automotive body electronics requiring stable component supply and long-term obsolescence management.
Supply support for AT34C02CN-SH-B 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 microcontrollers, analog, and memory solutions for industrial, automotive, and IoT markets.
The AT34C02C product line was designed specifically for robust, low-voltage serial EEPROM applications demanding multi-layer write protection, extended temperature operation, and I²C interoperability in mission-critical embedded systems.
FAQ
What is the maximum clock frequency supported by AT34C02CN-SH-B at 1.7 V?
The AT34C02CN-SH-B supports up to 100 kHz I²C clock frequency when operated at 1.7 V. This is specified in Table 2-4 of the official datasheet (5185F), where tLOW and tHIGH timing parameters are characterized for 1.7 V operation. Higher frequencies (400 kHz) require VCC ≥ 2.7 V.
Does AT34C02CN-SH-B support partial page writes?
Yes, AT34C02CN-SH-B supports partial page writes. As stated in the Features section and confirmed in Section 6 ("Write Operations"), the device allows writing fewer than 16 bytes within a 16-byte page boundary without affecting unaddressed bytes in that page - a key advantage over block-erase architectures.
How does hardware write protection interact with software write protection on AT34C02CN-SH-B?
When the WP pin is high (connected to VCC), AT34C02CN-SH-B inhibits all write operations - including programming of both permanent and reversible software write protect registers. Software protection remains active only when WP is low or floating, allowing selective locking of the first 1K bits while leaving the second half writable.
What package type is used for AT34C02CN-SH-B?
AT34C02CN-SH-B uses the 8-lead JEDEC SOIC package (package code 8S1), with 0.150-inch body width, gull-wing leads, NiPdAu lead finish, and industrial temperature range (–40°C to +85°C). This is explicitly defined in the Ordering Information table (Section 9) of the AT34C02C datasheet.
Is AT34C02CN-SH-B still recommended for new designs?
No - AT34C02CN-SH-B is Not Recommended for New Design (NRND), as documented in Revision History (5185E, March 2013). Microchip recommends migrating to AT34C02D for new projects due to enhanced ESD performance, extended temperature options, and continued long-term supply assurance.
AT34C02CN-SH-B 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:
- 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-B FAQ
1.How can I place an order for AT34C02CN-SH-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02CN-SH-B 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-B reliable?
The price and inventory of AT34C02CN-SH-B 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-B is usually 5 days.
3.What payment methods are accepted for AT34C02CN-SH-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02CN-SH-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02CN-SH-B?
AT34C02CN-SH-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02CN-SH-B 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-B?
For technical support, including AT34C02CN-SH-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02CN-SH-B requirements.
6.How does Aetrix verify that AT34C02CN-SH-B is sourced from the original manufacturer or authorized distributors?
All AT34C02CN-SH-B 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-B meets industry standards.
7.What is the process for return or replacement of AT34C02CN-SH-B?
All AT34C02CN-SH-B units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02CN-SH-B, 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-B part is unused and in its original packaging.
Return procedure for AT34C02CN-SH-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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