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Microchip Technology 34AA02-E/ST
- Part No.:
- 34AA02-E/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
34AA02-E/ST.pdf
- Description:
- IC EEPROM 2KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,049
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Product details
Overview
34AA02-E/ST from Microchip Technology is a 2 Kbit I²C-compatible serial EEPROM with hardware and dual software write-protection, operating from 1.7V to 5.5V, supporting 400 kHz clock rate, and rated for automotive temperature range (–40°C to +125°C). It features 16-byte page write buffer, 100 nA standby current, and Schmitt-trigger inputs for noise immunity in automotive body control modules and infotainment systems.
For engineers reviewing the 34AA02-E/ST datasheet, 34AA02-E/ST pinout, 34AA02-E/ST application, or 34AA02-E/ST equivalent, this page delivers verified electrical specs, validated pin functions, confirmed automotive-grade reliability data, and real-world use cases for secure configuration storage in harsh-temperature embedded systems.
Technical Context
The 34AA02-E/ST 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 write cycle is self-timed and supports both byte and page writes (up to 16 bytes), with automatic address pointer increment during sequential reads.
Write protection is implemented at three levels: hardware (WP pin tied to VCC), resettable software (SWP/CSWP commands), and permanent software (PSWP command), all targeting the lower 128-byte region (00h–7Fh). The device includes VCC threshold detection (<1.35V disable) and SDA/SCL input filtering for brown-out and noise resilience.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), sufficient for firmware identifiers, calibration data, and secure keys in compact ECUs. |
| Supply voltage | 1.7V–5.5V - enables direct interface with 1.8V, 3.3V, and 5V microcontrollers without level shifting. |
| I²C clock rate | Up to 400 kHz - supports high-throughput configuration updates in real-time automotive diagnostics. |
| Standby current | 1 µA max (automotive temp) - minimizes battery drain in always-on vehicle modules. |
| Endurance | 1 million erase/write cycles - ensures reliable logging over 10+ years of vehicle service life. |
| Data retention | 200 years at +85°C - guarantees long-term integrity of safety-critical calibration parameters. |
| Write protection | Hardware (WP pin), resettable SWP, and permanent PSWP - enables layered security for bootloader and VIN storage. |
Pinout & Package
34AA02-E/ST is supplied in a Pb-free, RoHS-compliant 6-lead SOT-23 package (3.0 mm × 1.7 mm × 1.3 mm), optimized for space-constrained 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 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; supports 400 kHz timing per AC spec. |
| VSS (Pin 2) | Ground reference | Return path for all internal logic and I/O; must be low-impedance to suppress ground bounce. |
| SDA (Pin 3) | Bidirectional data I/O | Open-drain interface requiring external pull-up; handles address, command, and data transfer. |
| A1 (Pin 4) | Chip select bit | Part of 3-bit slave address (A2–A0); enables up to four SOT-23 devices on one bus (A2 unconnected). |
| A0 (Pin 5) | Chip select bit / VHV detector | Selects device address; also senses high-voltage (7–10 V) for SWP/CSWP command activation. |
| VCC (Pin 6) | Power supply | Accepts 1.7–5.5 V; powers internal HV generator and memory array; includes brown-out detection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual software write-protection | Resettable (SWP/CSWP) and permanent (PSWP) lock of lower 128 bytes - enables secure boot parameter storage with irreversible lockdown option. |
| Automotive temperature rating | –40°C to +125°C operation - qualified for under-hood and dashboard-mounted modules without derating. |
| Low-power operation | 100 nA typical standby current - extends battery life in parked-vehicle monitoring circuits. |
| Noise-immune I/O | Schmitt-trigger inputs + 50 ns spike suppression - prevents spurious writes on electrically noisy CAN/Ethernet-adjacent PCBs. |
| Page write capability | 16-byte buffer with wrap-around boundary handling - reduces I²C transaction count for bulk configuration updates. |
Applications
| Automotive Body Control Unit | Infotainment System Configuration |
|---|---|
Use Scenario: Storing door lock settings, mirror position presets, and seat memory profiles in a centralized BCM. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with write-protection against accidental overwrite during firmware updates. Use Value: Enables field-upgradable user preferences while preventing corruption of factory-calibrated safety thresholds via PSWP lockdown. |
Use Scenario: Retaining radio station presets, display brightness levels, and audio equalizer settings across power cycles. IC Role / Device Role / Timing Role: I²C slave EEPROM providing fast, low-power access to user preference data during system boot. Use Value: Delivers <1 µA standby draw and 400 kHz write speed - critical for maintaining responsive UI startup in energy-conscious head units. |
| Telematics Control Unit | Advanced Driver Assistance Module |
Use Scenario: Logging GPS module calibration offsets and cellular modem IMEI binding data in a TCU with extended vehicle lifecycle. IC Role / Device Role / Timing Role: Secure, long-retention storage for regulatory-compliant identity and calibration records. Use Value: 200-year data retention at +85°C and 1M endurance ensure compliance with automotive functional safety documentation requirements. |
Use Scenario: Holding camera lens focus calibration tables and radar sensor compensation coefficients in ADAS ECU. IC Role / Device Role / Timing Role: Protected memory for mission-critical sensor metadata, accessed only during initialization or recalibration. Use Value: Hardware WP pin + PSWP allows full-array lock during vehicle operation, preventing runtime corruption by transient EMI events. |
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, no PSWP feature, 100-year retention. | Lacks permanent software write-protection; requires external hardware locking for immutable data. | Choose when higher-speed writes (1 MHz) are needed and PSWP is unnecessary. |
| BR24G02NUX-10 | 2 Kbit I²C EEPROM, 1.6–5.5 V, 400 kHz, built-in write-protect register, 100-year retention, AEC-Q200 qualified. | Supports software write-protect register but no permanent lock; different pinout (SOP-8). | Prefer for AEC-Q200-compliant designs where SOP-8 footprint is acceptable and PSWP is not required. |
Compared with AT24C02C-SSHM-T and BR24G02NUX-10, the 34AA02-E/ST uniquely provides permanent software write-protection (PSWP) in an automotive-rated SOT-23 package, enabling tamper-proof storage of immutable firmware parameters without external components or layout changes.
Availability
34AA02-E/ST is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and consumer IoT devices requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 34AA02-E/ST 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 for embedded control applications.
The 34AA02-E/ST belongs to Microchip's automotive-grade serial EEPROM family, designed specifically for secure, reliable nonvolatile storage in harsh-temperature environments such as engine control, chassis, and infotainment systems.
FAQ
What is the maximum I²C clock frequency supported by the 34AA02-E/ST?
The 34AA02-E/ST supports up to 400 kHz I²C clock frequency across its full 1.7V–5.5V supply range and automotive temperature grade. At VCC < 1.8V, the maximum clock rate is reduced to 100 kHz per the AC specifications table. This ensures robust communication timing margins in low-voltage automotive subsystems.
Does the 34AA02-E/ST support permanent write-protection of memory contents?
Yes, the 34AA02-E/ST supports Permanent Software Write-Protect (PSWP), which irreversibly locks the lower 128 bytes (00h–7Fh) against any future write or erase operations - even after power cycling or WP pin state changes. Once executed, PSWP cannot be cleared, making it ideal for storing immutable firmware signatures or VIN data.
How many devices can be connected on the same I²C bus using the 34AA02-E/ST in SOT-23 package?
Up to four 34AA02-E/ST devices can be connected on a single I²C bus. Because the SOT-23 package lacks the A2 pin (NC), only A0 and A1 are used for chip addressing, yielding 2² = 4 unique slave addresses. This matches the Device Selection Table and Pin Function Table in the DS22029F datasheet.
What is the standby current specification for the 34AA02-E/ST at automotive temperature?
The 34AA02-E/ST specifies a maximum standby current of 1 µA at TA = –40°C to +125°C (automotive grade), per Table 1-1 DC Characteristics. This ultra-low quiescent draw is critical for always-on vehicle modules such as telematics gateways and remote keyless entry receivers.
Is the 34AA02-E/ST pin-compatible with other 2 Kbit I²C EEPROMs in SOT-23?
No - the 34AA02-E/ST uses a unique SOT-23 pinout (SCL–VSS–SDA–A1–A0–VCC) with A2 and WP unconnected. Most competing 2 Kbit SOT-23 EEPROMs assign different functions to pins 4–5 (e.g., WP and A2), making direct replacement impossible without PCB redesign. Always verify pin mapping before substitution.
34AA02-E/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 8-TSSOP
34AA02-E/ST FAQ
1.How can I place an order for 34AA02-E/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 34AA02-E/ST 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 34AA02-E/ST reliable?
The price and inventory of 34AA02-E/ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 34AA02-E/ST is usually 5 days.
3.What payment methods are accepted for 34AA02-E/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 34AA02-E/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 34AA02-E/ST?
34AA02-E/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 34AA02-E/ST 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 34AA02-E/ST?
For technical support, including 34AA02-E/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 34AA02-E/ST requirements.
6.How does Aetrix verify that 34AA02-E/ST is sourced from the original manufacturer or authorized distributors?
All 34AA02-E/ST 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 34AA02-E/ST meets industry standards.
7.What is the process for return or replacement of 34AA02-E/ST?
All 34AA02-E/ST units undergo pre-shipment inspection (PSI). If there is an issue with 34AA02-E/ST, 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 34AA02-E/ST part is unused and in its original packaging.
Return procedure for 34AA02-E/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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