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Microchip Technology 11AA02UIDT-I/SN
- Part No.:
- 11AA02UIDT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
11AA02UIDT-I/SN.pdf
- Description:
- IC EEPROM 2KBIT SGL WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,249
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Product details
Overview
11AA02UIDT-I/SN from Microchip Technology is a 2 Kbit (256 × 8) serial EEPROM with preprogrammed 32-bit unique ID, UNI/O® single I/O bus interface, 1.8–5.5 V operation, and industrial temperature range (–40°C to +85°C). It delivers 1 mA active current, 1 µA max standby current, and supports page-write up to 16 bytes for secure device identification in embedded authentication systems.
For engineers reviewing the 11AA02UIDT-I/SN datasheet, 11AA02UIDT-I/SN pinout, 11AA02UIDT-I/SN application, or 11AA02UIDT-I/SN equivalent, key selection criteria include its factory-programmed UID, Manchester-encoded UNI/O® timing tolerance (±0.50% frequency drift per byte), Schmitt-trigger SCIO input, built-in write protection logic, and SOT-23-3 package compatibility with space-constrained PCB layouts.
Technical Context
The 11AA02UIDT-I/SN implements a Manchester-encoded, master-controlled UNI/O® bus protocol using a single bidirectional SCIO line. Its internal clock recovery circuitry synchronizes to master bit periods (10–100 µs), tolerating ±0.06 UI input jitter and ±0.25 UI output jitter while dynamically adjusting phase on each MAK edge.
It integrates a nonvolatile STATUS register with WIP and WEL flags, block protection bits (BP0/BP1), and a current-limited slope-controlled SCIO driver. Memory access uses an auto-incrementing address pointer, supporting both random-address READ (0x03) and current-address CRRD (0x06) commands with ACK/NoACK handshaking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Density | 2 Kbit (256 × 8) EEPROM array - supports full memory read/write with 16-byte page buffer |
| Interface | UNI/O® single I/O bus with Manchester encoding - eliminates separate clock line; requires only SCIO, VCC, VSS |
| Supply Range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 2.5 V, 3.3 V, and 5 V microcontrollers without level shifters |
| Write Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in firmware update or calibration storage applications |
| Data Retention | >200 years - guarantees UID and configuration data integrity across product lifetime without refresh |
| UID Length | Factory-programmed 32-bit serial number - globally unique across all UID-family devices; scalable to longer lengths via software |
| Max Bit Rate | 100 kbps (equivalent to 100 kHz clock) - defines maximum communication speed under worst-case timing margins |
Pinout & Package
11AA02UIDT-I/SN is housed in a RoHS-compliant 3-lead SOT-23 package (SN suffix), with pin 1 = SCIO, pin 2 = VCC, pin 3 = VSS. No NC pins are bonded; all terminals serve defined electrical functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCIO | Serial Clock/Data I/O | Bidirectional Manchester-encoded bus line - carries clock and data in one signal; includes Schmitt trigger and slope control |
| VCC | Supply Voltage | Power input for core logic and EEPROM programming - supports 1.8–5.5 V; internal regulator enables stable operation across range |
| VSS | Ground Reference | Return path for all currents - must be low-impedance; shared with host system ground to maintain common-mode noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Preprogrammed 32-bit UID | Guaranteed uniqueness across entire UID-family production - enables secure device binding without host-side UID generation logic |
| UNI/O® Bus Protocol | Single-pin serial interface with embedded clock recovery - reduces PCB routing complexity and I/O count in resource-constrained MCUs |
| Page-Write Buffer (16 B) | Enables burst writes within one physical page (0x00–0x0F, 0x10–0x1F, etc.) - minimizes write cycle overhead and improves firmware update efficiency |
| Status Register Control | WIP flag allows polling during write; WEL and BP0/BP1 bits enable hardware-level write protection - eliminates need for external lock bits or software-only safeguards |
| Schmitt Trigger + Slope Control | Suppresses noise on SCIO line and eliminates ground bounce - ensures reliable communication in electrically noisy industrial environments |
Applications
| Secure Device Authentication | Firmware Version Tracking |
|---|---|
Use Scenario: Embedded system verifies authenticity of peripheral module before enabling critical functions. IC Role / Device Role / Timing Role: 11AA02UIDT-I/SN provides immutable, factory-assigned 32-bit UID used as cryptographic seed in challenge-response handshake. Use Value: Prevents counterfeit modules by binding hardware identity to firmware keys - no host MCU flash required for UID storage. |
Use Scenario: Industrial controller logs firmware revision and calibration date after field update. IC Role / Device Role / Timing Role: 11AA02UIDT-I/SN stores version string and timestamp in persistent memory accessible via UNI/O® READ command. Use Value: Enables traceability and rollback capability - 1M endurance supports >1000 updates over product lifetime. |
| Calibration Data Storage | Peripheral Configuration Lock |
Use Scenario: Sensor node retains factory-trimmed ADC offset/gain coefficients across power cycles. IC Role / Device Role / Timing Role: 11AA02UIDT-I/SN holds 8-byte calibration constants in first 8 bytes of EEPROM array. Use Value: Eliminates need for external trimming components - 200-year data retention ensures accuracy over full service life. |
Use Scenario: Medical device locks configuration parameters (e.g., safety thresholds) after regulatory approval. IC Role / Device Role / Timing Role: 11AA02UIDT-I/SN uses BP0/BP1 bits to protect upper 1/2 or full array from accidental overwrite. Use Value: Hardware-enforced write protection prevents runtime corruption - no software vulnerability surface for parameter tampering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM with unique ID applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C02C-SSHM-T | I²C interface (2-wire), no factory UID, 1 MHz max clock, 128-byte page size | Requires two dedicated I²C pins; UID must be programmed in-system - increases firmware complexity and risk of duplication | Choose when existing design already uses I²C and UID generation is acceptable; avoid when pin count or UID uniqueness assurance is critical. |
| 93LC46B-I/P | Microwire interface (3-wire), no UID, 1.8–5.5 V, 128 × 16 organization | Lacks preprogrammed identity; uses separate CLK/DI/DO lines - consumes more MCU GPIOs than UNI/O®'s single SCIO | Choose for legacy Microwire compatibility; avoid when secure, zero-configuration device identity is required. |
Compared with AT24C02C-SSHM-T and 93LC46B-I/P, the 11AA02UIDT-I/SN uniquely combines factory-programmed UID, single-pin UNI/O® interface, and hardware write protection - reducing BOM cost, layout area, and firmware development effort for authenticated peripherals.
Availability
11AA02UIDT-I/SN is available at Aetrix Electronics and suitable for secure device authentication, firmware version tracking, calibration data storage, and peripheral configuration lock applications requiring stable component supply and long-term lifecycle support.
Supply support for 11AA02UIDT-I/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 microcontroller, analog, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 11AA02UIDT-I/SN belongs to Microchip's UNI/O® EEPROM family, designed specifically for ultra-low-pin-count, secure identification and configuration storage in space- and cost-constrained embedded systems.
FAQ
What is the function of the SCIO pin on the 11AA02UIDT-I/SN?
The SCIO pin on the 11AA02UIDT-I/SN serves as the sole bidirectional serial interface for the UNI/O® bus, carrying both clock and data via Manchester encoding. It features Schmitt-trigger inputs for noise immunity and slope-controlled output to suppress ground bounce. The 11AA02UIDT-I/SN uses this pin for all communication - including READ, WRITE, RDSR, and WRSR commands - eliminating the need for separate clock or data lines.
Does the 11AA02UIDT-I/SN require external pull-up resistors on the SCIO line?
No, the 11AA02UIDT-I/SN does not require external pull-up resistors on the SCIO line. Its internal circuitry includes an active pull-up during idle states and current-limited drive capability, optimized for UNI/O® bus timing compliance. External pull-ups may distort Manchester waveform edges and violate AC specifications such as TSTBY (600 µs minimum standby pulse) and THDR (5 µs minimum start header low pulse).
How is the 32-bit unique ID accessed in the 11AA02UIDT-I/SN?
The 32-bit unique ID in the 11AA02UIDT-I/SN is stored in fixed memory locations (0x00–0x03) and accessed using standard READ (0x03) or CRRD (0x06) commands. Unlike general EEPROM data, the UID is factory-programmed and cannot be altered. The 11AA02UIDT-I/SN returns these bytes as the first four data outputs after issuing a READ command with word address 0x0000.
What happens if a WRITE command crosses a 16-byte page boundary on the 11AA02UIDT-I/SN?
If a WRITE command on the 11AA02UIDT-I/SN attempts to write across a 16-byte page boundary (e.g., starting at 0x0F and writing 2 bytes), the address pointer wraps to the start of the same page (0x00), overwriting previously loaded data. This behavior is documented in DS20005206A-page 11. To prevent corruption, application firmware must split multi-page writes - ensuring no single WRITE command exceeds the 16-byte page limit of the 11AA02UIDT-I/SN.
Can the 11AA02UIDT-I/SN operate reliably at 1.8 V supply voltage?
Yes, the 11AA02UIDT-I/SN is fully specified for 1.8 V operation across the industrial temperature range (–40°C to +85°C), with DC characteristics including VIH = 0.2×VCC (0.36 V min), VOL = 0.4 V max, and ICC Read = 1 mA max. Its low-voltage design enables direct integration with 1.8 V MCUs without level translation, and the 1 µA max standby current supports battery-powered applications where the 11AA02UIDT-I/SN remains powered but inactive for extended periods.
11AA02UIDT-I/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:
- Single Wire
- Clock Frequency:
- 100 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
11AA02UIDT-I/SN FAQ
1.How can I place an order for 11AA02UIDT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 11AA02UIDT-I/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 11AA02UIDT-I/SN reliable?
The price and inventory of 11AA02UIDT-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 11AA02UIDT-I/SN is usually 5 days.
3.What payment methods are accepted for 11AA02UIDT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 11AA02UIDT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 11AA02UIDT-I/SN?
11AA02UIDT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 11AA02UIDT-I/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 11AA02UIDT-I/SN?
For technical support, including 11AA02UIDT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 11AA02UIDT-I/SN requirements.
6.How does Aetrix verify that 11AA02UIDT-I/SN is sourced from the original manufacturer or authorized distributors?
All 11AA02UIDT-I/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 11AA02UIDT-I/SN meets industry standards.
7.What is the process for return or replacement of 11AA02UIDT-I/SN?
All 11AA02UIDT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 11AA02UIDT-I/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 11AA02UIDT-I/SN part is unused and in its original packaging.
Return procedure for 11AA02UIDT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
11AA02UIDT-I/SN Tags
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