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Microchip Technology AT34C02C-TH-T
- Part No.:
- AT34C02C-TH-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT34C02C-TH-T.pdf
- Description:
- IC EEPROM 2KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,561
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Product details
Overview
AT34C02C-TH-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. It is used in industrial control systems for storing calibration data, configuration settings, and firmware parameters.
For engineers reviewing the AT34C02C-TH-T datasheet, AT34C02C-TH-T pinout, AT34C02C-TH-T application, or AT34C02C-TH-T equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options - all grounded in the official AT34C02C datasheet (Rev. 5185F).
Technical Context
The AT34C02C-TH-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 organized as 256 words of 8 bits, internally segmented into 16 pages of 16 bytes each, supporting both byte and page write modes with self-timed 5 ms max write cycles.
Write protection is implemented at three levels: hardware via the WP pin (full-array lock when tied to VCC), permanent software protection (irreversible, locks addresses 00H–7FH), and reversible software protection (configurable via special command sequences using VHV and address pin states). All protections coexist and are evaluated independently during write attempts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2048 bits (256 × 8), organized in 16 pages of 16 bytes - enables efficient partial updates without full-erase overhead |
| 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 |
| I²C speed modes | 100 kHz at 1.7 V; 400 kHz at 2.7 V and 5.0 V - ensures compatibility with legacy and high-speed controllers |
| Write endurance | 1 million write cycles - suitable for frequent parameter logging or dynamic configuration storage |
| Data retention | 100 years at 25°C - guarantees long-term integrity of stored calibration or security keys |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded applications including PLCs and sensors |
| Standby current | 0.6 µA at 1.7 V - minimizes power draw in battery-backed or energy-constrained systems |
Pinout & Package
AT34C02C-TH-T is packaged in an 8-lead TSSOP (JEDEC MO-153, package code 8X), 4.4 mm body width, 0.65 mm pitch. Pin 1 is marked by a beveled corner or dot; leads are gull-wing, lead-free (NiPdAu), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Hardware device address inputs | Enable up to eight AT34C02C devices on one I²C bus; must be hardwired to GND/VCC - floating pins default to GND but risk coupling-induced glitches |
| SDA | Serial data bidirectional I/O | Open-drain output; requires external pull-up; supports wire-OR with other I²C devices; Schmitt trigger input suppresses noise |
| SCL | Serial clock input | Positive-edge sampled clock; negative-edge data output; Schmitt trigger input enhances noise immunity in noisy environments |
| WP | Hardware write protect control | Active-high: ties entire array read-only; low/floating enables software-controlled protection; internal pull-down avoids undefined state |
| VCC | Power supply | Accepts 1.7–5.5 V; internal regulation enables stable core operation across wide voltage range |
| GND | Ground reference | Return path for all I/O and internal circuitry; must be low-impedance to ensure noise-free SDA/SCL transitions |
Key Features
| Feature | Design Value |
|---|---|
| Permanent software write protection | Irreversibly locks first 1024 bits (00H–7FH); prevents accidental or malicious overwrite of critical boot/config data |
| Reversible software write protection | Configurable lock/unlock of first 1024 bits via dedicated VHV-assisted commands - enables field-updatable secure regions |
| Hardware write protection (WP pin) | Full-array lock independent of software state; provides fail-safe physical override for system-level security policies |
| 16-byte page write mode | Reduces write time vs. byte-by-byte; allows burst programming of configuration blocks while preserving page boundary alignment |
| Self-timed write cycle (≤5 ms) | Eliminates need for external timing control; microcontroller can poll ACK or insert fixed delay before next access |
Applications
| Industrial Sensor Calibration | Smart Meter Configuration Storage |
|---|---|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and temperature compensation tables in environmental monitoring nodes. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during power-up initialization and runtime correction routines via I²C. Use Value: Ensures consistent measurement accuracy across product lifetime; 100-year data retention eliminates recalibration cycles in sealed units. |
Use Scenario: Holding tariff schedules, billing registers, and communication protocol settings in utility-grade electricity meters. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration memory with hardware (WP) and software (PSWP) protection layers. Use Value: Prevents unauthorized modification of billing logic; permanent write protection safeguards regulatory-critical parameters. |
| PLC I/O Module Settings | Medical Device Setup Parameters |
Use Scenario: Retaining channel scaling factors, alarm thresholds, and input filter configurations in programmable logic controller expansion modules. IC Role / Device Role / Timing Role: Low-power, fast-access EEPROM interfaced directly to ARM Cortex-M host MCU over 400 kHz I²C. Use Value: Enables hot-swap reconfiguration without firmware reload; 1.7 V operation supports wide-input power supplies common in industrial rails. |
Use Scenario: Storing user-adjustable therapy parameters (e.g., infusion rate limits, alarm sensitivity) in portable infusion pumps. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory with dual software protection (permanent + reversible) for audit-trail-capable parameter history. Use Value: Supports FDA-required traceability: reversible lock allows clinician updates; permanent lock preserves factory defaults and safety limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT34C02D-TH-T | Direct successor; identical pinout, voltage range, and memory organization; improved ESD rating (4 kV HBM vs. 2 kV) | Same industrial temperature grade and I²C timing; supports newer automotive qualification requirements | Select for new designs requiring extended lifecycle support and enhanced robustness - AT34C02C-TH-T is Not Recommended for New Design per Rev. 5185E |
| M24C02-RMN6TP | 2 Kbit I²C EEPROM (STMicroelectronics); same 8-lead TSSOP package; 1.7–5.5 V; 400 kHz max; no permanent software write protect | Lacks irreversible PSWP register; relies solely on WP pin and software lock - less suitable for regulatory-critical immutable data | Choose where cost sensitivity outweighs need for permanent protection; verify WP pin routing matches AT34C02C-TH-T behavior |
Compared with AT34C02C-TH-T, AT34C02D-TH-T offers backward-compatible enhancements for long-term design stability, while M24C02-RMN6TP provides functional equivalence without permanent write protection - making it viable only where immutable parameter locking is not required.
Availability
AT34C02C-TH-T is available at Aetrix Electronics and suitable for industrial control systems, smart metering infrastructure, and medical device manufacturing requiring stable component supply and long-term obsolescence management.
Supply support for AT34C02C-TH-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 its serial EEPROM portfolio. The company specializes in secure, low-power, and industrial-grade semiconductor solutions with broad automotive and industrial certifications.
The AT34C02C belongs to Atmel's SEEPROM (Serial Electrically-Erasable Programmable Read-Only Memory) family, designed specifically for reliable, low-voltage nonvolatile storage in space-constrained and power-sensitive embedded systems.
FAQ
What is the operating voltage range of the AT34C02C-TH-T?
The AT34C02C-TH-T operates from 1.7 V to 5.5 V, enabling direct integration with 1.8 V, 3.3 V, and 5 V logic families. Its I²C interface supports 100 kHz at minimum 1.7 V and scales to 400 kHz at 2.7 V and 5.0 V. This wide range eliminates the need for external level-shifting circuitry in mixed-voltage systems, and the AT34C02C-TH-T maintains full functionality-including write protection and page writes-across the entire voltage window.
Does the AT34C02C-TH-T support permanent write protection, and how is it enabled?
Yes, the AT34C02C-TH-T includes a permanent software write protection (PSWP) register that irreversibly locks the first 1024 bits (addresses 00H–7FH). It is enabled by sending a specific command sequence (device address 0110 followed by don't-care address/data) with the WP pin held low and VCC ≥ 4.8 V. Once programmed, the PSWP register cannot be cleared-even after power cycling-and the AT34C02C-TH-T will no longer acknowledge subsequent PSWP programming attempts.
What package type does the AT34C02C-TH-T use, and what are its key mechanical features?
The AT34C02C-TH-T uses an 8-lead TSSOP package (JEDEC MO-153, code 8X), 4.4 mm body width, 0.65 mm lead pitch, with gull-wing leads and NiPdAu lead finish. Its compact footprint (3.0 × 4.4 mm) and low profile (1.2 mm max height) suit dense PCB layouts. Pin 1 is identified by a beveled corner or dot, and the package is RoHS-compliant and halogen-free - matching the exact ordering code suffix "-TH-T" per Atmel's packaging documentation.
How does hardware write protection (WP pin) interact with software write protection on the AT34C02C-TH-T?
On the AT34C02C-TH-T, the WP pin provides independent, overriding hardware protection: when tied to VCC, it disables all write operations regardless of software protection state. When WP is low or floating, software protection (permanent or reversible) governs access to the first 1024 bits, while the upper half (80H–FFH) remains writable. This layered scheme allows flexible security policies - e.g., WP = VCC for factory lockdown, WP = GND for field-configurable protection - and the AT34C02C-TH-T enforces all conditions simultaneously during write attempts.
Is the AT34C02C-TH-T still recommended for new designs?
No - the AT34C02C-TH-T is explicitly marked "Not Recommended for New Design" in revision 5185E (March 2013) of its datasheet and has been superseded by the AT34C02D-TH-T. The replacement offers identical pinout, electrical specifications, and memory architecture, plus enhanced ESD robustness (4 kV HBM) and continued long-term availability. While the AT34C02C-TH-T remains supported for existing production, new designs should migrate to AT34C02D-TH-T to ensure supply continuity and qualification alignment.
AT34C02C-TH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- 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-TSSOP
AT34C02C-TH-T FAQ
1.How can I place an order for AT34C02C-TH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT34C02C-TH-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 AT34C02C-TH-T reliable?
The price and inventory of AT34C02C-TH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT34C02C-TH-T is usually 5 days.
3.What payment methods are accepted for AT34C02C-TH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT34C02C-TH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT34C02C-TH-T?
AT34C02C-TH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT34C02C-TH-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 AT34C02C-TH-T?
For technical support, including AT34C02C-TH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT34C02C-TH-T requirements.
6.How does Aetrix verify that AT34C02C-TH-T is sourced from the original manufacturer or authorized distributors?
All AT34C02C-TH-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 AT34C02C-TH-T meets industry standards.
7.What is the process for return or replacement of AT34C02C-TH-T?
All AT34C02C-TH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT34C02C-TH-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 AT34C02C-TH-T part is unused and in its original packaging.
Return procedure for AT34C02C-TH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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