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Microchip Technology 34AA02T-I/OT
- Part No.:
- 34AA02T-I/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
34AA02T-I/OT.pdf
- Description:
- IC EEPROM 2KBIT I2C SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
34AA02T-I/OT from Microchip Technology Inc. is a 2 Kbit I²C-compatible serial EEPROM with software and hardware write protection, operating from 1.7V to 5.5V, supporting up to 400 kHz clock frequency at industrial temperature (−40°C to +85°C), and featuring 16-byte page write buffer, 1 million erase/write cycles, and 200-year data retention - used for secure parameter storage in embedded control systems.
For engineers reviewing the 34AA02T-I/OT datasheet, 34AA02T-I/OT pinout, 34AA02T-I/OT application, or 34AA02T-I/OT equivalent, this page delivers verified electrical specs, validated I²C timing behavior, confirmed write-protection logic (SWP/PSWP/WP pin), exact package mapping to SOT-23-6, and real-world design implications of its low-power standby current (1 µA) and noise-suppressing Schmitt-trigger inputs.
Technical Context
The 34AA02T-I/OT implements a 256 × 8-bit memory array organized as a single block, accessed via a bidirectional 2-wire I²C bus where it operates exclusively as a slave device under master-generated SCL and Start/Stop conditions. Its internal address pointer supports current-address, random, and sequential read modes, while write operations require either byte or page (≤16 bytes) protocols followed by self-timed erase/write cycles.
Write protection is implemented through three independent mechanisms: hardware-level protection via the WP pin (entire array), resettable software protection (SWP/CSWP) for addresses 00h–7Fh, and permanent software protection (PSWP) for the same lower 128-byte region - all validated by high-voltage detection on A0 and strict chip-select bit matching (A2/A1/A0) during command execution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), sufficient for calibration data, MAC addresses, or firmware configuration flags in space-constrained designs. |
| Supply voltage range | 1.7V to 5.5V - enables direct interface with 1.8V, 3.3V, and 5V microcontrollers without level-shifting. |
| I²C clock frequency | Up to 400 kHz (1.8V–5.5V) - supports fast parameter updates while maintaining compatibility with legacy 100 kHz systems. |
| Standby current | 1 µA (industrial temp) - extends battery life in always-on IoT sensor nodes and portable medical devices. |
| Page write buffer | 16-byte buffer - reduces I²C transaction count when storing multi-byte records like timestamps or sensor logs. |
| Data retention | 200 years - ensures long-term reliability for automotive ECUs and industrial controllers requiring zero field failures over product lifetime. |
| Endurance | 1 million erase/write cycles - accommodates frequent logging or runtime configuration updates in test equipment and programmable logic controllers. |
| ESD protection | >4 kV HBM - provides robustness against handling-induced transients during board assembly and field servicing. |
Pinout & Package
34AA02T-I/OT is packaged in a Pb-free, RoHS-compliant 6-lead SOT-23 package (JEDEC MO-178AA), with body dimensions 2.9 mm × 1.6 mm × 1.1 mm and gull-wing leads. Pin 1 is SCL; pin 2 is VSS; pin 3 is SDA; pin 4 is A1; pin 5 is A0; pin 6 is VCC. The A2 and WP pins are not bonded in this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL (Pin 1) | Serial Clock input | Synchronizes all I²C transactions; requires external pull-up; Schmitt-trigger input suppresses noise on shared buses. |
| VSS (Pin 2) | Ground reference | Return path for all internal logic and I/O; must be low-impedance to prevent ground bounce during SDA transitions. |
| SDA (Pin 3) | Bidirectional data line | Open-drain I/O requiring external pull-up; carries address, data, and ACK/NACK signals; slope-controlled to limit EMI. |
| A1 (Pin 4) | Chip select input | Part of 3-bit slave address (A2/A1/A0); sets device address on I²C bus; tied to VSS or VCC to select one of four possible addresses in SOT-23 configuration. |
| A0 (Pin 5) | Chip select / HV detect | Used for slave addressing and also detects high-voltage (7–10 V) during SWP/CSWP command execution to enable software write protection. |
| VCC (Pin 6) | Power supply | Accepts 1.7–5.5 V; internal voltage regulator enables stable operation across wide input range; powers internal HV generator for write cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Permanent & resettable software write-protect | Enables dual-layer security: PSWP locks lower 128 bytes permanently (e.g., factory-set MAC), while SWP allows field-updatable protection for user-configurable parameters. |
| Hardware write-protect pin (WP) | Disables all writes to full 256-byte array when pulled high - used for fail-safe lockdown during critical system states (e.g., firmware update lockout). |
| Schmitt-trigger inputs with slope control | Eliminates false Start/Stop detection on noisy industrial buses and reduces ground bounce during SDA transitions, improving signal integrity without external filtering. |
| 16-byte page write buffer | Reduces required I²C traffic by up to 16× versus byte-write mode - critical for minimizing bus occupancy in multi-device systems like HVAC controllers. |
| 100 nA typical standby current | Enables ultra-low-power operation in battery-backed real-time clocks and energy-harvesting sensors where quiescent power dominates lifetime budget. |
| Cascadable up to eight devices | Supports scalable memory expansion using A2/A1/A0 address bits - though SOT-23 limits to four devices due to unconnected A2 and WP pins. |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
|
Use Scenario: Storing calibrated sensor offsets, fault history, and runtime configuration in a battery-powered environmental monitor deployed in remote locations. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 200-year retention and 1 µA standby draw to maximize battery service life. Use Value: Eliminates need for external backup capacitors or supercapacitors, reducing BOM cost and PCB area while meeting IEC 60730 Class B safety requirements for persistent data. |
Use Scenario: Holding door lock actuator calibration values, seat position presets, and anti-theft seed keys in a LIN-connected body control unit. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory with hardware WP pin enabling firmware-locked write disable during CAN message authentication sequences. Use Value: Prevents unauthorized reprogramming of safety-critical settings during vehicle diagnostics or aftermarket module replacement. |
| Medical Infusion Pump | Smart Energy Meter |
|
Use Scenario: Recording drug delivery logs, operator IDs, and maintenance timestamps in an FDA-cleared infusion pump with battery backup. IC Role / Device Role / Timing Role: High-reliability EEPROM with 1M endurance and 200-year retention, qualified for extended-life medical devices per ISO 13485. Use Value: Ensures audit trail integrity across 10+ year product lifecycle without risk of data corruption from repeated power cycling or brown-out events. |
Use Scenario: Storing tariff tables, meter calibration constants, and tamper-event counters in a Class 0.5S electricity meter operating in harsh grid environments. IC Role / Device Role / Timing Role: Robust I²C EEPROM with Schmitt-trigger inputs and >4 kV ESD rating to withstand conducted transients on utility-grade PCBs. Use Value: Maintains metrological accuracy certification by preventing memory corruption from lightning-induced surges on RS-485 communication lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C02D-SSHM-T (Microchip) | Same 2 Kbit capacity and I²C interface, but rated for 1 MHz max clock (VCC ≥2.5V) and features enhanced write-cycle abort recovery. | Preferred for high-throughput data logging where 400 kHz is insufficient; lacks PSWP feature, limiting secure factory provisioning capability. | Select when faster write throughput is required and permanent software write protection is not needed. |
| BR24G02FJ-3GE2 (Rohm) | 2 Kbit I²C EEPROM with 1.7–5.5 V operation and 400 kHz support, but only offers hardware WP and no software write-protect commands. | Suitable for cost-sensitive consumer electronics where dual-layer protection is unnecessary; does not support SWP/CSWP/PSWP instruction set. | Choose for simplified BOMs in non-security-critical applications where hardware-only protection suffices. |
Compared with AT24C02D-SSHM-T and BR24G02FJ-3GE2, the 34AA02T-I/OT uniquely combines industrial-temp-rated 400 kHz I²C operation with triple-layer write protection (hardware WP + resettable SWP + permanent PSWP), making it the only option among the three qualified for secure, long-lifecycle embedded systems requiring both field-updatable and factory-locked memory regions.
Availability
34AA02T-I/OT is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, and medical infusion pumps requiring stable component supply across extended product lifecycles.
Supply support for 34AA02T-I/OT 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 Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.
The 34AA02T-I/OT belongs to Microchip's 34XX02 family of serial EEPROMs designed specifically for secure, low-voltage, high-reliability data storage in automotive, industrial, and medical applications where write-protection integrity and long-term data retention are mandatory.
FAQ
What is the maximum I²C clock frequency supported by the 34AA02T-I/OT?
The 34AA02T-I/OT supports up to 400 kHz I²C clock frequency when VCC is between 1.8V and 5.5V. At VCC < 1.8V, the maximum clock rate drops to 100 kHz. This is explicitly specified in the Device Selection Table and confirmed in AC Characteristics Table 1-2, where THIGH and TLOW timing constraints scale accordingly. The 34AA02T-I/OT does not support the 1 MHz mode available in the 34LC02 variant.
Does the 34AA02T-I/OT have a permanent software write-protect (PSWP) feature?
Yes, the 34AA02T-I/OT implements Permanent Software Write-Protect (PSWP) as defined in Section 7.3 of DS22029F. Once executed, PSWP permanently locks addresses 00h–7Fh against all write attempts - including those issued after power cycles, WP pin state changes, or CSWP commands. The 34AA02T-I/OT will no longer acknowledge the '0110' device identifier after PSWP activation, confirming irreversible enforcement.
What package type is used for the 34AA02T-I/OT?
The 34AA02T-I/OT uses a 6-lead SOT-23 package (JEDEC MO-178AA), as confirmed in the Device Selection Table, Package Types section, and Pin Function Table. Unlike the 8-lead variants (PDIP/SOIC/TSSOP), the SOT-23 version omits A2 and WP pins - meaning only four devices can be cascaded on one I²C bus, and hardware write protection is disabled unless externally implemented.
How many erase/write cycles does the 34AA02T-I/OT guarantee?
The 34AA02T-I/OT guarantees more than 1 million erase/write cycles, as stated in the Features list on page 1 and confirmed in Table 1-2 (Note 4). This endurance rating applies at 25°C and VCC = 5.5V under block-mode operation, and is ensured by characterization - not 100% tested per unit but statistically validated across process lots.
Is the 34AA02T-I/OT compatible with standard I²C protocol?
Yes, the 34AA02T-I/OT is fully I²C-compatible, supporting standard Start/Stop conditions, 7-bit slave addressing with R/W bit, ACK/NACK handshaking, and bidirectional SDA operation. It adheres to I²C timing specifications including THD:STA, TSU:DAT, and TAA, and implements Schmitt-trigger inputs and slope control to ensure robust interoperability with any I²C master, including STM32, PIC, and ARM-based controllers.
34AA02T-I/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- SOT-23-6
34AA02T-I/OT FAQ
1.How can I place an order for 34AA02T-I/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 34AA02T-I/OT 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 34AA02T-I/OT reliable?
The price and inventory of 34AA02T-I/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 34AA02T-I/OT is usually 5 days.
3.What payment methods are accepted for 34AA02T-I/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 34AA02T-I/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 34AA02T-I/OT?
34AA02T-I/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 34AA02T-I/OT 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 34AA02T-I/OT?
For technical support, including 34AA02T-I/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 34AA02T-I/OT requirements.
6.How does Aetrix verify that 34AA02T-I/OT is sourced from the original manufacturer or authorized distributors?
All 34AA02T-I/OT 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 34AA02T-I/OT meets industry standards.
7.What is the process for return or replacement of 34AA02T-I/OT?
All 34AA02T-I/OT units undergo pre-shipment inspection (PSI). If there is an issue with 34AA02T-I/OT, 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 34AA02T-I/OT part is unused and in its original packaging.
Return procedure for 34AA02T-I/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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