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Microchip Technology 34AA02T-I/ST
- Part No.:
- 34AA02T-I/ST
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
34AA02T-I/ST.pdf
- Description:
- IC EEPROM 2KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,841
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Product details
Overview
34AA02T-I/ST 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 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 in the TSSOP-8 package.
For engineers reviewing the 34AA02T-I/ST datasheet, 34AA02T-I/ST pinout, 34AA02T-I/ST application, or 34AA02T-I/ST equivalent, this device serves as a low-voltage, high-reliability nonvolatile memory for secure configuration storage, calibration data logging, and system identity management in space-constrained embedded designs.
Technical Context
The 34AA02T-I/ST 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 synchronized to the master's SCL clock. Its internal address pointer supports current-address, random, and sequential read modes.
Write protection is implemented through three independent mechanisms: hardware-level protection via the WP pin (entire array), resettable software write-protect (SWP) for addresses 00h–7Fh, and permanent software write-protect (PSWP) for the same lower 128-byte region - all validated by dedicated control byte identifiers ('0110') and A0-pin high-voltage detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8-bit), enabling compact firmware parameter or MAC address storage without external addressing logic |
| VCC range | 1.7V to 5.5V - supports direct interface with 1.8V, 3.3V, and 5V microcontrollers without level shifting |
| I²C speed | Up to 400 kHz - delivers ~400 bytes/s write throughput with page buffering, suitable for infrequent but deterministic updates |
| Write endurance | 1 million erase/write cycles - ensures >10 years of daily 274-write operations in field-deployed systems |
| Data retention | 200 years at 25°C - guarantees long-term integrity of calibration coefficients or security keys across product lifecycle |
| Standby current | 100 nA typical - minimizes battery drain in always-on IoT sensors and portable medical devices |
| Page write buffer | 16 bytes - reduces I²C transaction count by 94% vs. byte writes for full-page updates, lowering bus arbitration overhead |
Pinout & Package
34AA02T-I/ST is packaged in an 8-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, 3.0 mm × 4.4 mm body, and exposed pad option not present - optimized for automated assembly and thermal performance in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Chip select input / VHV detection | Part of 3-bit device address (A2–A0); also senses high voltage (>7V) during SWP/CSWP command execution to enable write-protect register access |
| A1 | Chip select input | Second bit of slave address; enables cascading up to eight devices on one I²C bus (four for SOT-23 variant) |
| A2 | Chip select input | Most significant chip select bit; must match corresponding bits in control byte '1010 A2 A1 A0 R/W' for device selection |
| VSS | Ground reference | Primary return path for all internal logic and I/O; requires low-impedance connection to minimize noise coupling into SDA/SCL lines |
| SDA | Serial data I/O | Open-drain bidirectional line requiring external pull-up (2–10 kΩ); carries address, data, and ACK/NACK signals per I²C protocol |
| SCL | Serial clock input | Master-generated clock synchronizing all data transfers; Schmitt-trigger input suppresses noise-induced false edges |
| WP | Hardware write-protect enable | Active-high signal: tied to VCC locks entire 256-byte array against accidental writes; tied to VSS disables hardware protection |
| VCC | Power supply | Single 1.7–5.5V rail powers EEPROM core and I/O; internal voltage detector disables writes below 1.35V to prevent corruption |
Key Features
| Feature | Design Value |
|---|---|
| Permanent & resettable software write-protect | Enables dual-layer security: PSWP permanently locks 00h–7Fh for factory-set data (e.g., MAC), while SWP allows field-updatable protected regions |
| Schmitt trigger inputs on SCL/SDA | Provides 50 mV hysteresis (0.05×VCC) and 50 ns spike suppression - eliminates need for external RC filtering on noisy industrial buses |
| Output slope control | Controls SDA rise/fall times to limit ground bounce and EMI during transitions - critical for stable operation in mixed-signal PCBs |
| 16-byte page write buffer | Reduces required I²C transactions from 16 to 1 per page update, cutting bus occupancy time by >90% and improving system responsiveness |
| ESD protection >4,000V | Meets HBM Class 3A requirements - protects against handling damage during manual assembly and field service without external TVS diodes |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and linearization tables in pressure or temperature transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed once at power-up; no real-time timing constraints. Use Value: Eliminates need for external trimming components and enables post-manufacture calibration updates via service port using SWP-controlled write access. |
Use Scenario: Holding patient-specific therapy parameters and device serial number in portable insulin pumps or infusion controllers. IC Role / Device Role / Timing Role: Secure identity and settings storage with PSWP locking immutable fields (e.g., regulatory ID) and SWP protecting user-modifiable values. Use Value: Ensures FDA-required traceability and prevents unauthorized parameter changes - WP pin adds tamper-evident hardware lock during maintenance. |
| Automotive Body Control Module | Consumer IoT Device Identity |
|
Use Scenario: Retaining seat/mirror position memory and lighting presets across ignition cycles in 12V automotive systems. IC Role / Device Role / Timing Role: Low-power persistent memory interfaced to 3.3V MCU over I²C; operates across −40°C to +85°C ambient. Use Value: 100 nA standby current extends battery life during vehicle sleep mode; 1.7V operation ensures reliable writes during cold-crank brownouts. |
Use Scenario: Storing unique device identifiers (e.g., IEEE EUI-48), Wi-Fi credentials, and firmware version in smart home hubs and wearables. IC Role / Device Role / Timing Role: Secure provisioning memory accessed during boot and OTA update verification; write-protected after initial setup. Use Value: PSWP prevents credential overwrite after manufacturing; 200-year retention guarantees lifetime device identity integrity without cloud dependency. |
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 | Same 2 Kbit capacity and I²C interface, but rated only to 100 kHz at 1.7V; lacks PSWP and VHV-based SWP activation | Acceptable for cost-sensitive consumer products without permanent write-lock requirements | Select when PSWP is unnecessary and 100 kHz speed suffices; verify WP pin behavior matches system-level protection scheme |
| BR24G02-3MNUX | Supports 1 MHz I²C at ≥2.5V, includes write-cycle interrupt (INT) pin, but no hardware WP pin or PSWP functionality | Better suited for high-throughput logging where fast writes matter more than immutable factory data | Choose when faster write completion signaling is needed and software-only protection is acceptable |
Compared with AT24C02C-SSHM-T and BR24G02-3MNUX, the 34AA02T-I/ST uniquely combines industrial temperature support, hardware WP pin, and permanent software write-protect - making it the only option for applications requiring guaranteed immutability of factory-programmed data under extended environmental stress.
Availability
34AA02T-I/ST is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for 34AA02T-I/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 leading provider of microcontroller, analog, FPGA, and memory solutions, founded in 1989 and headquartered in Chandler, Arizona.
The 34AA02T-I/ST belongs to Microchip's serial EEPROM product line, designed specifically for secure, low-power, and robust nonvolatile data storage in space-constrained embedded systems across industrial, automotive, and medical markets.
FAQ
What is the maximum I²C clock frequency supported by the 34AA02T-I/ST?
The 34AA02T-I/ST supports up to 400 kHz I²C clock frequency across its full 1.7V–5.5V VCC range at industrial temperature. At VCC < 1.8V, the maximum clock rate drops to 100 kHz to ensure reliable timing margins - a key constraint for battery-powered designs operating near minimum supply voltage.
How does hardware write protection work on the 34AA02T-I/ST?
Hardware write protection on the 34AA02T-I/ST is controlled by the WP pin: when tied to VCC, the entire 256-byte memory array is locked against all write operations including byte, page, and software write-protect commands; when tied to VSS, hardware protection is disabled and software-based protection remains fully functional.
Can the 34AA02T-I/ST be used in automotive applications?
The 34AA02T-I/ST is rated for industrial temperature (−40°C to +85°C), not automotive grade (−40°C to +125°C). For automotive use, Microchip offers the pin-compatible 34AA02E variant - the 34AA02T-I/ST itself is unsuitable for under-hood or other high-temperature automotive subsystems per its official qualification.
What is the purpose of the A0 pin beyond chip addressing?
In addition to serving as the least-significant chip address bit, the A0 pin on the 34AA02T-I/ST detects high voltage (VHV) during SWP and CSWP command execution: applying >7V to A0 enables write-protect register access, preventing accidental activation of permanent or resettable software protection under normal operating conditions.
Does the 34AA02T-I/ST support sequential reads across multiple devices?
No - the 34AA02T-I/ST does not support sequential reads across device boundaries. While up to eight devices can share one I²C bus using A2–A0 addressing, each device maintains its own internal address pointer; reading past the last byte of one device does not auto-increment to the first byte of the next device.
34AA02T-I/ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
34AA02T-I/ST FAQ
1.How can I place an order for 34AA02T-I/ST through Aetrix?
Please submit a Request for Quotation (RFQ) for 34AA02T-I/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 34AA02T-I/ST reliable?
The price and inventory of 34AA02T-I/ST 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/ST is usually 5 days.
3.What payment methods are accepted for 34AA02T-I/ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 34AA02T-I/ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 34AA02T-I/ST?
34AA02T-I/ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 34AA02T-I/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 34AA02T-I/ST?
For technical support, including 34AA02T-I/ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 34AA02T-I/ST requirements.
6.How does Aetrix verify that 34AA02T-I/ST is sourced from the original manufacturer or authorized distributors?
All 34AA02T-I/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 34AA02T-I/ST meets industry standards.
7.What is the process for return or replacement of 34AA02T-I/ST?
All 34AA02T-I/ST units undergo pre-shipment inspection (PSI). If there is an issue with 34AA02T-I/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 34AA02T-I/ST part is unused and in its original packaging.
Return procedure for 34AA02T-I/ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
34AA02T-I/ST Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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