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Microchip Technology 34AA02T-E/OT
- Part No.:
- 34AA02T-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
34AA02T-E/OT.pdf
- Description:
- IC EEPROM 2KBIT I2C SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
34AA02T-E/OT from Microchip Technology is a 2 Kbit I²C-compatible serial EEPROM with software and hardware write protection, operating from 1.7V to 5.5V, supporting 400 kHz clock rate, 16-byte page write buffer, and rated for automotive temperature range (–40°C to +125°C) in SOT-23 package. It serves as nonvolatile configuration storage in automotive body control modules.
For engineers reviewing the 34AA02T-E/OT datasheet, 34AA02T-E/OT pinout, 34AA02T-E/OT application, or 34AA02T-E/OT equivalent, key selection criteria include its automotive-grade endurance (1 million cycles), 200-year data retention, dual software write-protect modes (resettable and permanent), low 100 nA standby current, and SOT-23 footprint compatibility with space-constrained ECUs.
Technical Context
The 34AA02T-E/OT implements a 256 × 8-bit memory array organized as a single block, accessed via standard I²C protocol with slave address decoding using A0–A2 pins. Its internal address pointer supports current-address, random, and sequential read modes without external addressing logic.
Write protection is implemented through three independent mechanisms: hardware (WP pin tied to VCC), resettable software (SWP/CSWP commands), and permanent software (PSWP command). Schmitt-trigger inputs on SCL/SDA and input filtering suppress bus noise, while VCC threshold detection disables writes below 1.35V to prevent corruption during brown-out.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), sufficient for firmware revision IDs, calibration coefficients, or secure boot keys in automotive microcontrollers. |
| Supply voltage | 1.7V to 5.5V - enables direct interface with 1.8V, 3.3V, and 5V MCU I/O domains without level shifters. |
| I²C speed | Up to 400 kHz - supports fast parameter updates in real-time vehicle networks without blocking main CPU execution. |
| Page write buffer | 16 bytes - reduces write transaction count by 16× vs. byte-write, minimizing bus occupancy and power consumption. |
| Endurance | 1 million erase/write cycles - meets automotive requirement for infotainment settings or ADAS sensor calibration logging over 15+ years. |
| Data retention | 200 years at +85°C - ensures EEPROM contents survive full vehicle lifecycle including extended storage or high-temperature under-hood operation. |
| Standby current | 1 µA max (automotive grade) - critical for always-on modules like door ECU or seat controller where quiescent power must stay below 10 µA. |
| Operating temp | –40°C to +125°C - qualified for engine bay, transmission control, or headlamp driver applications per AEC-Q100 Class 0. |
Pinout & Package
34AA02T-E/OT uses a 6-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm), optimized for high-density automotive PCBs. Pin 1 is SCL; pin 2 is VSS; pin 3 is SDA; pin 4 is A1; pin 5 is A0; pin 6 is VCC. 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 rejects <50 ns noise spikes. |
| VSS (Pin 2) | Ground reference | Return path for all internal logic and I/O; must be low-inductance connection to minimize ground bounce during SDA transitions. |
| SDA (Pin 3) | Bidirectional data line | Open-drain I/O requiring external pull-up (2 kΩ typical for 400 kHz); supports multi-master arbitration and ACK polling. |
| A1 (Pin 4) | Chip select bit | Part of 3-bit slave address (A2/A1/A0); sets device address on shared I²C bus; tied to VSS or VCC to select one of four possible addresses in SOT-23. |
| A0 (Pin 5) | Chip select bit / HV detect | Used for address selection and also detects high-voltage (7–10 V) during SWP/CSWP command execution to enable software write-protect programming. |
| VCC (Pin 6) | Power supply | Accepts 1.7–5.5 V; internal voltage regulator enables stable operation across battery voltage transients (e.g., cold-crank to 14 V). |
Key Features
| Feature | Design Value |
|---|---|
| Permanent Software Write-Protect (PSWP) | Irreversibly locks lower 128 bytes (00h–7Fh) after command execution - secures immutable factory calibration data against field overwrite or malware. |
| Resettable Software Write-Protect (SWP/CSWP) | Enables/disables write access to lower 128 bytes via I²C command - allows safe field updates to user-configurable parameters while protecting base firmware metadata. |
| Hardware Write-Protect (WP pin) | Disables all writes when pulled high - provides fail-safe physical lockout during manufacturing test or service mode, independent of software state. |
| 16-byte page write buffer | Reduces required I²C stop/start sequences by up to 94% for bulk writes - cuts bus utilization and host CPU overhead in telematics log buffering or OTA update staging. |
| Schmitt-trigger inputs with 50 ns spike suppression | Rejects EMI-induced glitches on SCL/SDA without external RC filters - eliminates need for board-level noise mitigation in high-noise engine compartments. |
| VCC brown-out protection | Blocks write operations below 1.35 V - prevents bit corruption during battery voltage sag, ensuring data integrity in start-stop systems. |
Applications
| Automotive Body Control Module | Industrial Sensor Node |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in a vehicle's door module. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed write integrity during ignition cycling and battery disconnect events. Use Value: Enables personalized user experience without requiring reprogramming after battery replacement, leveraging 200-year retention and 1M-cycle endurance. |
Use Scenario: Logging temperature/humidity calibration offsets and sensor fault history in a wireless environmental monitor. IC Role / Device Role / Timing Role: Low-power data logger memory interfaced to an ultra-low-power MCU via I²C. Use Value: Achieves sub-µA system standby with 100 nA EEPROM quiescent current, extending battery life beyond 10 years in sealed deployments. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Securing drug library metadata, dose limits, and audit trail timestamps in a Class II medical device. IC Role / Device Role / Timing Role: Tamper-resistant configuration vault with PSWP-locked safety-critical parameters. Use Value: Meets IEC 62304 requirements for immutable firmware identifiers and regulatory audit logs via permanent software write-protection. |
Use Scenario: Storing tariff tables, metering constants, and firmware version history in a DIN-rail mounted electricity meter. IC Role / Device Role / Timing Role: High-reliability parameter store operating continuously at 85°C ambient in enclosed enclosures. Use Value: Guarantees 200-year data retention at elevated temperatures, eliminating field replacement due to EEPROM wear-out over 20+ year utility asset lifecycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C02C-SSHM-T | 2 Kbit I²C EEPROM, 1.7–5.5 V, 1 MHz max clock, industrial temp only (–40°C to +85°C), no PSWP feature. | Lacks permanent software write-protect and automotive qualification - suitable for cost-sensitive industrial controls but not safety-critical automotive use. | Select when PSWP and AEC-Q100 compliance are unnecessary and higher-speed 1 MHz operation is needed. |
| BR24G02NUX-3TR | 2 Kbit I²C EEPROM, 1.6–5.5 V, 400 kHz, automotive temp (–40°C to +125°C), includes unique ID and write-protect register but no PSWP. | Offers factory-programmed 128-bit UID and enhanced WP register granularity, but lacks irreversible PSWP - better for traceability than immutable security. | Prefer for applications needing serialized device identity and flexible WP zones, where permanent locking is not mandated by functional safety standards. |
Compared with AT24C02C-SSHM-T and BR24G02NUX-3TR, the 34AA02T-E/OT uniquely delivers AEC-Q100 Class 0 qualification combined with permanent software write-protection - making it the only choice for automotive systems requiring irrevocable calibration lockout per ISO 26262 ASIL-B requirements.
Availability
34AA02T-E/OT is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and medical infusion pump designs requiring stable component supply with long-term lifecycle assurance.
Supply support for 34AA02T-E/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 leading provider of microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.
The 34AA02 family is designed specifically for automotive and industrial applications demanding high reliability, extended temperature operation, and robust write-protection - targeting ECU configuration storage, sensor calibration, and secure boot parameter retention.
FAQ
What is the maximum I²C clock frequency supported by the 34AA02T-E/OT?
The 34AA02T-E/OT supports up to 400 kHz I²C clock frequency across its full 1.7V–5.5V supply range. At VCC < 1.8V, the maximum clock drops to 100 kHz per datasheet DS22029F. This ensures reliable timing margin in low-voltage automotive subsystems such as LIN gateway modules or battery management sensors.
Does the 34AA02T-E/OT have permanent write protection capability?
Yes, the 34AA02T-E/OT implements Permanent Software Write-Protect (PSWP), which irreversibly locks the lower 128 bytes (addresses 00h–7Fh) after command execution. Once enabled, PSWP cannot be cleared by power cycling, software commands, or WP pin state - providing hardware-enforced immutability for factory calibration data.
How many devices can be connected on the same I²C bus using the 34AA02T-E/OT?
Up to four 34AA02T-E/OT devices can share one I²C bus. Because the SOT-23 package omits the A2 pin, only A1 and A0 are bond-wired, yielding two address bits - enabling slave addresses 1010000, 1010001, 1010010, and 1010011. This is sufficient for multi-sensor clusters in automotive door modules or HVAC control units.
What is the write endurance and data retention specification for the 34AA02T-E/OT?
The 34AA02T-E/OT guarantees 1 million erase/write cycles and 200 years of data retention at +85°C. These specifications are characterized per AEC-Q100 stress testing and apply across the full automotive temperature range (–40°C to +125°C), ensuring reliability in under-hood applications like transmission control units.
Is the 34AA02T-E/OT RoHS compliant and lead-free?
Yes, the 34AA02T-E/OT is Pb-free and RoHS compliant, with matte tin (Sn) plating per JEDEC standard. The SOT-23 package marking includes "e3" designation, and Pb-free status is noted on reel labels per Microchip's packaging specification DS22029F-page 16.
34AA02T-E/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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
34AA02T-E/OT FAQ
1.How can I place an order for 34AA02T-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 34AA02T-E/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-E/OT reliable?
The price and inventory of 34AA02T-E/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-E/OT is usually 5 days.
3.What payment methods are accepted for 34AA02T-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 34AA02T-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 34AA02T-E/OT?
34AA02T-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 34AA02T-E/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-E/OT?
For technical support, including 34AA02T-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 34AA02T-E/OT requirements.
6.How does Aetrix verify that 34AA02T-E/OT is sourced from the original manufacturer or authorized distributors?
All 34AA02T-E/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-E/OT meets industry standards.
7.What is the process for return or replacement of 34AA02T-E/OT?
All 34AA02T-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with 34AA02T-E/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-E/OT part is unused and in its original packaging.
Return procedure for 34AA02T-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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