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Microchip Technology 11AA161T-I/SN
- Part No.:
- 11AA161T-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
11AA161T-I/SN.pdf
- Description:
- IC EEPROM 16KBIT SGL WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,913
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Product details
Overview
11AA161T-I/SN from Microchip Technology is a 16 Kbit (2,048 × 8) serial EEPROM with UNI/O® single I/O bus interface, 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features 16-byte page write buffer, Schmitt-trigger SCIO input, output slope control, and built-in write protection including power-on/off circuitry and STATUS register control. It is used in embedded systems for parameter storage, calibration data retention, and firmware configuration in space-constrained designs.
For engineers reviewing the 11AA161T-I/SN datasheet, 11AA161T-I/SN pinout, 11AA161T-I/SN application, or 11AA161T-I/SN equivalent, key selection considerations include its 1.8 V minimum operating voltage, 100 kbps Manchester-encoded UNI/O® interface, 1 µA max standby current, page-write capability, and SOT-23-3 package compatibility with legacy 3-pin footprint layouts.
Technical Context
The 11AA161T-I/SN implements a Manchester-encoded, single-wire UNI/O® protocol where clock and data share the SCIO line; timing synchronization occurs via start header detection and dynamic re-synchronization on each MAK bit. Its internal architecture includes a 16-byte page latch, STATUS register with WIP/WEL/BP bits, and high-voltage generator for EEPROM programming.
It supports block write protection (none/¼/½/all array), self-timed write cycles (5–10 ms), and operates across 1.8–5.5 V with guaranteed 100 kbps bit rate at VCC ≥ 2.5 V. Schmitt-trigger inputs and controlled output slew suppress ground bounce and improve noise immunity in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Density | 16 Kbit (2,048 × 8 organization) - supports up to 2 KB of nonvolatile configuration or calibration data storage |
| Interface | UNI/O® single I/O bus (SCIO only) - eliminates need for dedicated clock or chip-select lines, reducing PCB routing complexity |
| VCC Range | 1.8 V to 5.5 V - enables direct interfacing with low-voltage microcontrollers (e.g., 1.8 V I/O domains) without level shifting |
| Standby Current | ≤1 µA (max, I-temp) - extends battery life in always-on sensor nodes and portable devices |
| Write Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in field-updatable systems requiring frequent parameter writes |
| Data Retention | >200 years - guarantees integrity of stored calibration coefficients or security keys over full product lifecycle |
| Page Size | 16 bytes - allows efficient burst writes while avoiding cross-page boundary errors in firmware update routines |
Pinout & Package
11AA161T-I/SN is packaged in 3-lead SOT-23 (SN suffix), with pin 1 = SCIO, pin 2 = VSS, pin 3 = VCC. No NC pins are connected; all three terminals are functional and electrically defined per datasheet Pin Function Table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCIO | Serial Clock/Data I/O | Manchester-encoded bidirectional signal carrying both clock and data; requires external pull-up; supports Schmitt-trigger input and slew-controlled output |
| VSS | Ground Reference | Primary return path for all internal currents; must be low-impedance connection to minimize noise coupling into SCIO |
| VCC | Supply Voltage | Power input for EEPROM core and interface logic; decoupling capacitor (0.1 µF) required within 1 cm of pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| UNI/O® Serial Interface | Single-pin bus reduces MCU GPIO usage and PCB layer count - ideal for ultra-compact modules with limited I/O resources |
| Status Register Control | WEL bit enables/disables writes; WIP bit indicates active programming - allows software to poll completion without timeout assumptions |
| Block Write Protection | BP0/BP1 bits configure 0%, 25%, 50%, or 100% array protection - prevents accidental overwrite of critical boot parameters or security keys |
| Self-Timed Write Cycle | No external timing control needed; internal oscillator manages erase/write - simplifies host firmware and eliminates need for precise delay loops |
| ESD Robustness | >4,000 V HBM - withstands handling and board-level ESD events common in industrial assembly and field service |
Applications
| Smart Sensor Calibration | IoT Edge Device Configuration |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and temperature compensation tables in MEMS pressure sensors. IC Role / Device Role / Timing Role: Nonvolatile parameter storage element interfaced directly to sensor ASIC's GPIO; accessed during power-up initialization sequence. Use Value: Enables plug-and-play accuracy without host MCU involvement; 1.8 V operation matches sensor ASIC's low-power domain. |
Use Scenario: Holding Wi-Fi credentials, OTA update flags, and device-specific identifiers in battery-powered BLE gateways. IC Role / Device Role / Timing Role: Secure configuration store accessed by MCU during boot and network provisioning; write-protected via STATUS register BP bits. Use Value: Prevents credential corruption during brown-out events; 1 µA standby current extends 10-year battery life in sealed enclosures. |
| Industrial PLC I/O Module Setup | Medical Diagnostic Equipment Settings |
|
Use Scenario: Retaining channel scaling factors, alarm thresholds, and input filter settings across power cycles in DIN-rail mounted I/O expanders. IC Role / Device Role / Timing Role: System-level configuration memory mapped to MCU's peripheral driver; accessed via polled UNI/O® read during module enumeration. Use Value: Eliminates need for external SPI flash or I²C EEPROM; SOT-23-3 footprint fits tight spacing between terminal blocks and isolation barriers. |
Use Scenario: Preserving user-selected display brightness, language preference, and safety interlock configurations in portable ultrasound units. IC Role / Device Role / Timing Role: Human-interface state storage with write-protection enabled during clinical operation to prevent unintended changes. Use Value: Meets IEC 62304 Class B software requirements via hardware-enforced write disable; >200-year data retention satisfies regulatory archival mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 11AA160T-I/SN | Same density (16 Kbit), same UNI/O® interface, but device address 0xA0 vs. 0xA1; no functional difference in standalone use | Identical pinout and electrical specs; differs only in hardwired device code - allows dual-device bus sharing without conflict | Select when multiple 11AA16x devices coexist on one UNI/O® bus; otherwise functionally interchangeable |
| AT24C128-MAHM-T | I²C interface (2-wire), 128 Kbit capacity, 1.7–5.5 V, SOIC-8 package - requires two GPIOs and pull-ups; higher density but larger footprint | Used where existing I²C infrastructure exists; not drop-in replaceable due to different protocol, pin count, and addressing scheme | Choose for higher capacity or I²C ecosystem compatibility; avoid if minimizing GPIO count or board area is critical |
Compared with 11AA161T-I/SN, 11AA160T-I/SN offers identical performance in single-device systems but enables multi-drop UNI/O® bus operation, while AT24C128-MAHM-T trades pin efficiency and protocol simplicity for greater density and industry-standard I²C support.
Availability
11AA161T-I/SN is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and IoT edge node applications requiring stable component supply, long-term data retention, and low-voltage serial memory integration.
Supply support for 11AA161T-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions for embedded control applications.
The 11AA161T-I/SN belongs to Microchip's UNI/O® serial EEPROM family, designed specifically for space- and power-constrained systems needing reliable, low-pin-count nonvolatile storage with robust noise immunity and wide voltage operation.
FAQ
What is the UNI/O® interface used by the 11AA161T-I/SN?
The 11AA161T-I/SN uses Microchip's patented UNI/O® bus - a single-wire, Manchester-encoded serial interface where clock and data are combined on the SCIO pin. This eliminates separate clock and data lines, reducing GPIO usage and PCB routing complexity. The 11AA161T-I/SN synchronizes to the master's timing via start headers and maintains alignment using dynamic re-synchronization on each MAK bit.
Does the 11AA161T-I/SN support write protection?
Yes, the 11AA161T-I/SN supports hardware-based write protection through its STATUS register. BP0 and BP1 bits enable block protection of none, 1/4, 1/2, or all of the memory array. Additionally, it includes built-in power-on/off data protection circuitry and a write-enable latch (WEL bit) that must be set before any write operation - both features ensure robust safeguarding of critical configuration data in the 11AA161T-I/SN.
What is the maximum write speed and endurance of the 11AA161T-I/SN?
The 11AA161T-I/SN supports up to 100 kbps bit rate (equivalent to 100 kHz clock frequency) and has a typical write cycle time of 5–10 ms depending on command type. It guarantees 1,000,000 erase/write cycles per memory location and >200 years of data retention at 25°C - specifications validated per Microchip DS22067J datasheet and applicable to the full 16 Kbit array of the 11AA161T-I/SN.
Can the 11AA161T-I/SN operate at 1.8 V?
Yes, the 11AA161T-I/SN is fully specified for operation from 1.8 V to 5.5 V. At 1.8 V, it maintains functionality across the industrial temperature range (–40°C to +85°C), with DC characteristics including VIH ≤ 0.3×VCC and VOL ≤ 0.4 V. Its 1 µA max standby current and 1 mA typical active current at 1.8 V make it suitable for ultra-low-power applications - a key design feature of the 11AA161T-I/SN.
What packages are available for the 11AA161T-I/SN?
The 11AA161T-I/SN is offered in the 3-lead SOT-23 package (indicated by the "SN" suffix). This compact surface-mount package measures 2.9 mm × 1.6 mm × 1.1 mm and is RoHS-compliant. It shares the same pinout (SCIO-VSS-VCC) and footprint as other 3-lead variants in the 11AA/11LC family, enabling direct replacement in space-constrained designs where the 11AA161T-I/SN is deployed.
11AA161T-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:
- 16Kbit
- Memory Organization:
- 2K 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
11AA161T-I/SN FAQ
1.How can I place an order for 11AA161T-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 11AA161T-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 11AA161T-I/SN reliable?
The price and inventory of 11AA161T-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 11AA161T-I/SN is usually 5 days.
3.What payment methods are accepted for 11AA161T-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 11AA161T-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 11AA161T-I/SN?
11AA161T-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 11AA161T-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 11AA161T-I/SN?
For technical support, including 11AA161T-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 11AA161T-I/SN requirements.
6.How does Aetrix verify that 11AA161T-I/SN is sourced from the original manufacturer or authorized distributors?
All 11AA161T-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 11AA161T-I/SN meets industry standards.
7.What is the process for return or replacement of 11AA161T-I/SN?
All 11AA161T-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 11AA161T-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 11AA161T-I/SN part is unused and in its original packaging.
Return procedure for 11AA161T-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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