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Microchip Technology 34AA02-E/P
- Part No.:
- 34AA02-E/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
34AA02-E/P.pdf
- Description:
- IC EEPROM 2KBIT I2C 400KHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,900
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Product details
Overview
34AA02-E/P 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 up to 400 kHz clock (100 kHz below 1.8V), and rated for automotive temperature range (−40°C to +125°C). It features 16-byte page write buffer, 1 million erase/write cycles, and >200-year data retention - deployed in automotive body control modules for secure calibration storage.
For engineers reviewing the 34AA02-E/P datasheet, 34AA02-E/P pinout, 34AA02-E/P application, or 34AA02-E/P equivalent, this page delivers verified electrical specs, validated pin functions, confirmed automotive-grade reliability metrics, and real-world use cases in safety-critical embedded systems requiring nonvolatile memory with configurable write protection.
Technical Context
The 34AA02-E/P implements a 256 × 8-bit memory array organized as one block, accessed via a bidirectional 2-wire I²C bus where it operates exclusively as a slave device synchronized to an external master's SCL clock. Its internal address pointer auto-increments during sequential reads and supports current-address, random, and sequential read modes.
Write protection is enforced at three levels: hardware (WP pin tied to VCC), resettable software (SWP/CSWP commands), and permanent software (PSWP command), all targeting the lower 128 bytes (00h–7Fh). Schmitt-trigger inputs on SDA/SCL and input filtering suppress noise, while VCC threshold detection disables writes below 1.35V to prevent brown-out corruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), sufficient for firmware checksums, sensor calibration tables, or configuration registers in compact ECUs. |
| 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 (100 kHz when VCC < 1.8V) - balances speed and noise immunity in automotive wiring harnesses. |
| Write endurance | 1 million erase/write cycles - supports frequent logging or parameter updates over 10+ years of vehicle operation. |
| Data retention | >200 years at +25°C - ensures calibration data integrity across full vehicle lifecycle, including long-term storage. |
| Standby current | 1 µA max (automotive grade) - minimizes battery drain in always-on modules like door controllers or seat memory systems. |
| Page write buffer | 16-byte - reduces bus occupancy time versus byte-write, improving system responsiveness during bulk configuration updates. |
Pinout & Package
34AA02-E/P uses an 8-lead PDIP package (0.300" width), pin-compatible with SOIC, TSSOP, MSOP, and TDFN variants. Pin 1 is A0; pin 4 is VSS; pin 8 is VCC. The package is Pb-free and RoHS compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip select input / VHV detection | Used for device addressing (A2–A0) and high-voltage detection during SWP/CSWP command execution (VHV ≥ 7V). |
| A1 | Chip select input | Part of 3-bit slave address (A2–A0); enables cascading up to eight devices on same I²C bus. |
| A2 | Chip select input | MSB of slave address; unconnected in SOT-23 variant but functional in PDIP/SOIC/TSSOP/MSOP/TDFN packages. |
| VSS | Ground reference | Primary return path for all internal logic and I/O; must be low-impedance to ensure noise-immune I²C signaling. |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up; carries address, data, and ACK/NACK signals per I²C protocol. |
| SCL | Serial clock input | Master-generated clock synchronizing all data transfers; Schmitt-trigger input rejects bus noise up to 50 ns spikes. |
| WP | Hardware write-protect enable | Active-high signal: tied to VCC to lock entire 256-byte array; tied to VSS to disable hardware protection. |
| VCC | Power supply | Accepts 1.7–5.5V; internal regulation ensures stable core operation across automotive battery transients. |
Key Features
| Feature | Design Value |
|---|---|
| Dual software write-protection | SWP (resettable) and PSWP (permanent) commands protect lower 128 bytes - enables secure storage of immutable firmware keys alongside modifiable calibration data. |
| Hardware write-protect pin | WP pin provides immediate, unconditional lock of full memory array - used during manufacturing programming or field service to prevent accidental overwrite. |
| Low-voltage operation down to 1.7V | Enables direct connection to ultra-low-power MCUs (e.g., PIC16LF1xxx) without voltage translation, reducing BOM count and PCB area. |
| Schmitt-trigger inputs with spike suppression | 50 ns input filter + hysteresis (0.05×VCC) eliminates false triggers from EMI in engine bay or chassis harness environments. |
| Self-timed write cycle | 5 ms typical byte/page write time with automatic internal timing - relieves host MCU of delay management and simplifies firmware design. |
Applications
| Automotive Body Control Module | Industrial Sensor Node |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in a vehicle's body control unit. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with tamper-resistant write protection for user-customizable settings. Use Value: PSWP locks factory-default calibration data; SWP allows dealer-level updates; WP pin prevents field overwrite during diagnostics. |
Use Scenario: Retaining calibrated offset/gain coefficients and sensor ID in a wireless temperature/humidity node. IC Role / Device Role / Timing Role: Persistent parameter storage with low-quiescent-current standby mode for battery-powered edge devices. Use Value: 1 µA max ICCS extends 2xAA battery life beyond 10 years; 16-byte page writes minimize radio-on time during OTA reconfiguration. |
| Medical Infusion Pump | Smart Meter Firmware Vault |
Use Scenario: Securing drug library metadata, dose limits, and audit logs in Class II medical equipment. IC Role / Device Role / Timing Role: Safety-critical NVM with deterministic write timing and brown-out protection to prevent partial writes during power loss. Use Value: VCC threshold detector disables writes below 1.35V; >200-year retention meets FDA long-term traceability requirements. |
Use Scenario: Storing cryptographic keys and firmware signature hashes in utility smart meters exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Tamper-evident memory with automotive-grade temp range (−40°C to +125°C) for outdoor meter enclosures. Use Value: E-temp rating ensures reliable operation in desert or arctic deployments; ESD >4 kV withstands handling and lightning-induced surges. |
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 | 2 Kbit I²C EEPROM, 1.7–5.5V, 1 MHz max clock, 1M endurance, but no permanent software write-protect (PSWP) feature. | Lacks PSWP - unsuitable where immutable factory calibration must coexist with field-updatable parameters. | Select when only resettable SWP and hardware WP are required; verify absence of PSWP does not compromise security architecture. |
| BR24G02FJ-3GE2 | 2 Kbit I²C EEPROM, 1.6–5.5V, 400 kHz max clock, 1M endurance, includes software write-protect but no dedicated WP pin. | No hardware WP pin - requires GPIO-controlled external switch or firmware-only protection, increasing attack surface. | Choose when board space constraints favor smaller 8-pin TSSOP and hardware WP is managed externally; confirm system-level write-locking suffices. |
Compared with AT24C02D-SSHM-T and BR24G02FJ-3GE2, the 34AA02-E/P uniquely combines automotive temperature rating, permanent software write-protection (PSWP), and a dedicated hardware WP pin - enabling layered, hardware-enforced memory security essential for ASIL-B systems.
Availability
34AA02-E/P is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor nodes, medical infusion pumps, and smart meter firmware vaults requiring stable component supply with guaranteed long-term availability.
Supply support for 34AA02-E/P 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 company specializing in microcontrollers, analog devices, and memory solutions for embedded control applications.
The 34AA02-E/P belongs to Microchip's serial EEPROM product line, designed specifically for automotive and industrial systems demanding robust nonvolatile storage with multi-layer write protection and extended temperature operation.
FAQ
What is the maximum I²C clock frequency supported by the 34AA02-E/P?
The 34AA02-E/P supports up to 400 kHz I²C clock frequency when VCC is 1.8V or higher. At VCC below 1.8V, the maximum clock frequency drops to 100 kHz to maintain timing margin and noise immunity - a critical consideration for low-voltage automotive subsystems.
Does the 34AA02-E/P have permanent write protection capability?
Yes, the 34AA02-E/P supports Permanent Software Write-Protect (PSWP), which irreversibly locks the lower 128 bytes (00h–7Fh) against modification. Once executed, PSWP cannot be cleared by power cycling, CSWP commands, or WP pin state - ensuring factory calibration data remains immutable.
How many devices can be connected on the same I²C bus using the 34AA02-E/P?
Up to eight 34AA02-E/P devices can be cascaded on a single I²C bus using the A2, A1, and A0 address pins to generate unique 3-bit chip select codes. Each device responds only when its A2:A0 state matches the corresponding bits in the master's control byte.
What is the purpose of the WP pin on the 34AA02-E/P?
The WP (Write-Protect) pin on the 34AA02-E/P provides hardware-level write inhibition: when tied to VCC, it disables all write operations to the full 256-byte memory array regardless of software protection state; when tied to VSS, hardware protection is disabled and software controls apply.
Is the 34AA02-E/P qualified for automotive applications?
Yes, the 34AA02-E/P is explicitly rated for the automotive temperature range (−40°C to +125°C) and carries the 'E' suffix per Microchip's device selection table. It meets AEC-Q100 stress test requirements for automotive electronics and is commonly used in body control modules and infotainment systems.
34AA02-E/P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
34AA02-E/P FAQ
1.How can I place an order for 34AA02-E/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 34AA02-E/P 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/P reliable?
The price and inventory of 34AA02-E/P 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/P is usually 5 days.
3.What payment methods are accepted for 34AA02-E/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 34AA02-E/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 34AA02-E/P?
34AA02-E/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 34AA02-E/P 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/P?
For technical support, including 34AA02-E/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 34AA02-E/P requirements.
6.How does Aetrix verify that 34AA02-E/P is sourced from the original manufacturer or authorized distributors?
All 34AA02-E/P 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/P meets industry standards.
7.What is the process for return or replacement of 34AA02-E/P?
All 34AA02-E/P units undergo pre-shipment inspection (PSI). If there is an issue with 34AA02-E/P, 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/P part is unused and in its original packaging.
Return procedure for 34AA02-E/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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