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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology 34AA02T-E/SN

Name: 34AA02T-E/SN
Brand: Microchip Technology
SKU: 34AA02T-E/SN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 34AA02T-E/SN

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: 34AA02T-E/SN.pdf

Description:: IC EEPROM 2KBIT I2C 400KHZ 8SOIC

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Product details

Overview

34AA02T-E/SN 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, and rated for automotive temperature range (−40°C to +125°C). It features 16-byte page write buffer, 100 nA standby current, and permanent/resettable software write-protect for lower 128 bytes (00h–7Fh), used in vehicle infotainment configuration storage.

For engineers reviewing the 34AA02T-E/SN datasheet, 34AA02T-E/SN pinout, 34AA02T-E/SN application, or 34AA02T-E/SN equivalent, key selection criteria include automotive-grade reliability, dual-layer write protection (SWP/PSWP + WP pin), I²C bus noise immunity via Schmitt-trigger inputs, and compatibility with cascaded multi-device systems requiring addressable memory blocks.

Technical Context

The 34AA02T-E/SN implements a 2-wire I²C slave interface with fixed 4-bit device code (1010) and 3-bit chip select (A2–A0), enabling up to eight devices on one bus (four for SOT-23 due to A2 NC). Its internal address pointer supports current-address, random, and sequential reads across 256 × 8-bit memory organization.

Write protection operates at three levels: hardware (WP pin tied to VCC locks full 256-byte array), resettable software (SWP/CSWP commands protect 00h–7Fh), and permanent software (PSWP command irreversibly locks 00h–7Fh). All write cycles - byte or page - are self-timed with typical 3 ms duration and require ACK polling for completion detection.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	2 Kbit (256 × 8-bit), sufficient for firmware identifiers, calibration data, or secure keys in compact embedded nodes
V_CC range	1.7V to 5.5V - enables direct interface with 1.8V, 3.3V, and 5V microcontrollers without level-shifting
I²C speed	Up to 400 kHz - supports high-throughput configuration updates while maintaining robustness on noisy automotive buses
Standby current	Typical 100 nA - minimizes battery drain in always-on vehicle modules such as door controllers or sensor nodes
Endurance	1 million erase/write cycles - ensures long-term reliability for frequently updated parameters like mileage counters or fault logs
Data retention	Greater than 200 years - guarantees nonvolatile storage integrity over full product lifecycle without refresh
ESD rating	>4,000 V HBM - withstands handling and system-level transients common in automotive assembly and service environments

Pinout & Package

34AA02T-E/SN is supplied in an 8-lead SOIC package (3.90 mm wide), RoHS-compliant and Pb-free, with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Pin 1 is marked by notch or dot; orientation matches industry-standard SOIC layout.

Pin/Terminal	Circuit Role	Design Meaning
A0	Chip select input / V_HV detect	Used for device addressing (A0–A2 = 3-bit slave address); also senses high-voltage (7–10 V) during SWP/CSWP command execution
A1	Chip select input	Part of 3-bit hardware address; must be hardwired to VSS or VCC to select device on shared I²C bus
A2	Chip select input	Third bit of hardware address; enables up to eight 34AA02T-E/SN devices per bus (not available on SOT-23 variant)
VSS	Ground reference	Primary return path for all internal logic and I/O; requires low-impedance connection to system ground plane
SDA	Open-drain bidirectional data line	Carries I²C address/data; requires external pull-up resistor (2 kΩ for 400 kHz operation); supports noise filtering via internal Schmitt trigger
SCL	Input-only clock line	Master-generated timing signal; slope-controlled to suppress ground bounce; accepts 100–400 kHz frequencies
WP	Hardware write-protect enable	Active-high input: tie to VCC to lock entire 256-byte array against accidental writes; tie to VSS to disable hardware protection
VCC	Power supply	Accepts 1.7–5.5 V; internal voltage detector disables write operations below 1.35 V to prevent corruption during brown-out

Key Features

Feature	Design Value
Dual software write-protection modes	Resettable (SWP/CSWP) and permanent (PSWP) locking of lower 128 bytes - enables flexible security partitioning for boot code vs. runtime data
Page write buffer	16-byte internal buffer allows burst programming of contiguous addresses in single Stop-initiated cycle - reduces bus overhead by 94% vs. individual byte writes
Automotive temperature grade	Rated −40°C to +125°C - qualified for under-hood and infotainment applications where ambient thermal stress exceeds industrial limits
Noise-immune I²C interface	Schmitt-trigger inputs + 50 ns spike suppression on SDA/SCL - eliminates false Start/Stop detection in electrically harsh vehicle environments
Low-power standby mode	100 nA typical ICCS - extends battery life in always-on telematics modules without sacrificing memory accessibility

Applications

Vehicle ECU Configuration Storage	Secure Key Storage for Immobilizer Systems
Use Scenario: Storing calibrated sensor offsets, VIN-derived encryption seeds, and adaptive learning values in engine control units. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via I²C during power-up and runtime reconfiguration. Use Value: PSWP-locked lower 128 bytes preserve immutable security keys; SWP-protected upper bytes store field-updatable calibration data.	Use Scenario: Holding cryptographic keys used by vehicle immobilizer transponders and body control modules. IC Role / Device Role / Timing Role: Tamper-resistant key vault with hardware write-disable (WP = VCC) during normal operation. Use Value: Prevents unauthorized overwrite of critical keys even if host MCU is compromised; 200-year retention ensures lifetime validity.
Infotainment System Profile Memory	ADAS Camera Module Settings
Use Scenario: Saving user preferences (volume, display brightness, audio EQ) across power cycles in head-unit systems. IC Role / Device Role / Timing Role: Low-latency I²C slave providing fast read/write access to 256-byte preference bank. Use Value: 400 kHz I²C speed enables sub-10 ms profile load; 100 nA standby current avoids parasitic drain on backup battery.	Use Scenario: Storing lens focus calibration, white balance coefficients, and exposure tables in automotive camera modules. IC Role / Device Role / Timing Role: Automotive-grade EEPROM interfaced directly to image signal processor (ISP) over I²C. Use Value: −40°C to +125°C rating ensures stable operation near hot CMOS sensors; 1M endurance supports frequent recalibration events.

Vehicle ECU Configuration Storage

Secure Key Storage for Immobilizer Systems

Use Scenario: Storing calibrated sensor offsets, VIN-derived encryption seeds, and adaptive learning values in engine control units.

IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via I²C during power-up and runtime reconfiguration.

Use Value: PSWP-locked lower 128 bytes preserve immutable security keys; SWP-protected upper bytes store field-updatable calibration data.

Use Scenario: Holding cryptographic keys used by vehicle immobilizer transponders and body control modules.

IC Role / Device Role / Timing Role: Tamper-resistant key vault with hardware write-disable (WP = VCC) during normal operation.

Use Value: Prevents unauthorized overwrite of critical keys even if host MCU is compromised; 200-year retention ensures lifetime validity.

Infotainment System Profile Memory

ADAS Camera Module Settings

Use Scenario: Saving user preferences (volume, display brightness, audio EQ) across power cycles in head-unit systems.

IC Role / Device Role / Timing Role: Low-latency I²C slave providing fast read/write access to 256-byte preference bank.

Use Value: 400 kHz I²C speed enables sub-10 ms profile load; 100 nA standby current avoids parasitic drain on backup battery.

Use Scenario: Storing lens focus calibration, white balance coefficients, and exposure tables in automotive camera modules.

IC Role / Device Role / Timing Role: Automotive-grade EEPROM interfaced directly to image signal processor (ISP) over I²C.

Use Value: −40°C to +125°C rating ensures stable operation near hot CMOS sensors; 1M endurance supports frequent recalibration 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, but no PSWP feature; only SWP and WP pin	Lacks permanent software write-protect - unsuitable where irreversible key locking is required	Select when higher-speed 1 MHz operation is needed and permanent protection is unnecessary
BR24G02-3MNUX	2 Kbit I²C EEPROM, 1.6–5.5 V, 400 kHz, includes both SWP and PSWP, but rated only for industrial temp (−40°C to +85°C)	Not qualified for automotive extended temperature range - invalid for under-hood or ADAS use	Select for cost-sensitive industrial applications where −40°C to +125°C is not required

Compared with AT24C02C-SSHM-T and BR24G02-3MNUX, the 34AA02T-E/SN uniquely combines automotive temperature qualification, permanent software write-protection, and 400 kHz I²C performance - making it the only option among the three suitable for safety-critical vehicle subsystems requiring irreversible key storage and extended thermal resilience.

Availability

34AA02T-E/SN is available at Aetrix Electronics and suitable for automotive ECU configuration, infotainment profile storage, and ADAS camera calibration requiring stable component supply across long production lifecycles.

Supply support for 34AA02T-E/SN 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 34AA02 family delivers automotive-qualified serial EEPROMs optimized for secure, low-power, noise-immune data storage in vehicle subsystems where reliability and write-protection integrity are mission-critical.

FAQ

What is the maximum I²C clock frequency supported by the 34AA02T-E/SN?

The 34AA02T-E/SN supports up to 400 kHz I²C clock frequency across its full 1.7V–5.5V V_CC range. At V_CC < 1.8V, maximum frequency drops to 100 kHz. This is confirmed in Table 1-2 of DS22029F, and distinguishes it from the 34LC02 variant, which supports 1 MHz only above 2.5V.

Does the 34AA02T-E/SN support permanent write protection of memory contents?

Yes, the 34AA02T-E/SN supports Permanent Software Write-Protect (PSWP) for the lower 128 bytes (addresses 00h–7Fh). Once executed, PSWP cannot be reversed by power cycling, command, or WP pin state. This function is documented in Section 7.3 and Figure 7-1 of DS22029F.

What package type is used for the 34AA02T-E/SN part number?

The 34AA02T-E/SN uses an 8-lead SOIC package (3.90 mm wide), indicated by the "SN" suffix per Microchip's packaging nomenclature in DS22029F-page 15. The "E" denotes automotive temperature grade (−40°C to +125°C), and "T" indicates tape-and-reel packaging.

How many devices can be connected on the same I²C bus using the 34AA02T-E/SN?

Up to eight 34AA02T-E/SN devices can share one I²C bus using unique combinations of A0, A1, and A2 pins. Each device responds only when its hardware address matches the transmitted chip select bits. This is specified in Section 3.6 and Table 8-1 of DS22029F.

What is the purpose of the A0 pin beyond chip addressing in the 34AA02T-E/SN?

In addition to chip select, the A0 pin serves as the high-voltage (V_HV) detection input during SWP and CSWP command execution. It must receive 7–10 V (depending on V_CC) to enable these software write-protection functions, as defined in Electrical Characteristics Table 1-1, parameter D5.

34AA02T-E/SN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

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:: 8-SOIC

34AA02T-E/SN FAQ

1.How can I place an order for 34AA02T-E/SN through Aetrix?

Please submit a Request for Quotation (RFQ) for 34AA02T-E/SN 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/SN reliable?

The price and inventory of 34AA02T-E/SN 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/SN is usually 5 days.

3.What payment methods are accepted for 34AA02T-E/SN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 34AA02T-E/SN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 34AA02T-E/SN?

34AA02T-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 34AA02T-E/SN 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/SN?

For technical support, including 34AA02T-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 34AA02T-E/SN requirements.

6.How does Aetrix verify that 34AA02T-E/SN is sourced from the original manufacturer or authorized distributors?

All 34AA02T-E/SN 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/SN meets industry standards.

7.What is the process for return or replacement of 34AA02T-E/SN?

All 34AA02T-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 34AA02T-E/SN, 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/SN part is unused and in its original packaging.

Return procedure for 34AA02T-E/SN:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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