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Microchip Technology 11AA161-I/MS
- Part No.:
- 11AA161-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
11AA161-I/MS.pdf
- Description:
- IC EEPROM 16KBIT SGL WIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,337
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Product details
Overview
11AA161-I/MS from Microchip Technology is a 16 Kbit (2,048 × 8) serial EEPROM with single I/O UNI/O® bus interface, operating from 1.8V to 5.5V, featuring 16-byte page write buffer, Schmitt-trigger SCIO input, and 1 µA max standby current at I-temp (–40°C to +85°C). It is used in space-constrained embedded systems for parameter storage, calibration data retention, and firmware configuration in industrial sensors and portable medical devices.
For engineers reviewing the 11AA161-I/MS datasheet, 11AA161-I/MS pinout, 11AA161-I/MS application, or 11AA161-I/MS equivalent, key selection considerations include its 1.8V low-voltage operation, UNI/O® single-pin serial protocol compatibility, 1 M erase/write cycle endurance, >200-year data retention, and MSOP-8 package footprint with VCC/SCIO/VSS/NC pin assignment.
Technical Context
The 11AA161-I/MS implements Manchester-encoded UNI/O® communication over a single bidirectional SCIO line, eliminating need for separate clock or chip-select signals. Its internal architecture includes an 8-bit instruction register, page latches, high-voltage generator, and STATUS register with WIP/WEL/BP bits.
It supports dynamic re-synchronization during command execution to tolerate up to ±0.5% bus frequency drift per byte and ±0.06 UI edge jitter. Write operations are self-timed with 5–10 ms completion and include auto-erase; block protection can be configured to lock none, 1/4, 1/2, or all memory via BP0/BP1 bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Density | 16 Kbit (2,048 × 8 organization) - supports full device read/write in ≤2.05 kbytes of address space |
| VCC Range | 1.8V to 5.5V - enables direct interfacing with 1.8V/3.3V/5V microcontrollers without level shifting |
| Interface | Single I/O UNI/O® bus - reduces PCB routing to one signal plus power/ground, ideal for pin-limited MCUs |
| Page Size | 16 bytes - allows efficient burst writes without exceeding physical page boundaries (0x00–0x0F, 0x10–0x1F, etc.) |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in logging or calibration applications |
| Data Retention | >200 years at +85°C - ensures long-term reliability in unattended industrial deployments |
| Standby Current | 1 µA max (I-temp) - minimizes battery drain in always-on sensor nodes and wearables |
| Bus Speed | 100 kbps max (100 kHz equivalent) - provides deterministic timing for real-time firmware parameter access |
Pinout & Package
11AA161-I/MS is packaged in an 8-lead MSOP (MS) package with exposed pad (not electrically connected), measuring 4.9 mm × 3.0 mm × 1.0 mm. Pin 1 is marked by a dot; pin numbering follows standard MSOP convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unconnected; must be left floating or tied to GND per layout best practice |
| 2 (NC) | No Connect | Internally unconnected; no routing required |
| 3 (NC) | No Connect | Internally unconnected; not used for UNI/O® protocol operation |
| 4 (VSS) | Ground Reference | Primary return path for SCIO signaling and internal logic; requires low-impedance connection to system ground plane |
| 5 (VCC) | Supply Voltage | Power input for core logic and EEPROM array; bypass capacitor (0.1 µF) required within 5 mm |
| 6 (NC) | No Connect | Internally unconnected; no electrical function |
| 7 (NC) | No Connect | Internally unconnected; no routing needed |
| 8 (SCIO) | Serial Clock/Data I/O | Bidirectional Manchester-encoded bus line - carries clock + data; requires external pull-up (4.7 kΩ to VCC) |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger SCIO input | 0.05×VCC hysteresis - rejects noise spikes up to 50 ns duration and improves immunity in noisy industrial environments |
| Output slope control | Controlled rise/fall time (≤100 ns) - eliminates ground bounce on shared VSS traces in mixed-signal PCBs |
| Status register access | Real-time WIP/WEL/BP bit monitoring via RDSR - enables non-blocking polling during write cycles without interrupt overhead |
| Block write protection | Configurable BP0/BP1 bits - allows hardware-level locking of top/bottom quarters or halves of memory to prevent accidental firmware corruption |
| Power-on/off write protection | Automatic latch reset at POR/BOR - prevents partial writes during brown-out or cold-start conditions |
| ESD robustness | >4,000 V HBM - withstands handling and board assembly without additional protection circuitry |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing temperature compensation coefficients and sensor offset values in factory-calibrated pressure transducers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 200+ year retention and 1M-cycle endurance for field recalibration events. Use Value: Eliminates need for external voltage supervisors or backup capacitors due to built-in power-loss write protection. |
Use Scenario: Holding user-selected therapy modes, alarm thresholds, and usage logs in portable insulin pumps. IC Role / Device Role / Timing Role: Low-power (1 µA standby) serial EEPROM interfaced to 1.8V ARM Cortex-M0+ MCU via single GPIO. Use Value: Reduces BOM count and PCB area versus I²C/SPI EEPROMs while meeting ISO 13485 data integrity requirements. |
| Automotive Body Control Module | Smart Home Actuator Tuning |
Use Scenario: Saving seat position presets, mirror angles, and lighting profiles in vehicle memory seats. IC Role / Device Role / Timing Role: Industrial-temp (–40°C to +85°C) EEPROM accessed during ignition-on initialization sequence. Use Value: Operates reliably across automotive thermal cycles without derating; UNI/O® simplifies routing in dense BCM PCBs. |
Use Scenario: Storing motor stall detection thresholds and soft-start ramp rates in Wi-Fi-enabled smart blinds. IC Role / Device Role / Timing Role: Parameter store updated infrequently but requiring robustness against power interruptions during OTA updates. Use Value: Self-timed write cycle (5–10 ms) and auto-erase ensure complete writes even during brief AC dropout events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 11LC161-I/MS | Same 16 Kbit density and MSOP-8 package, but 2.5–5.5V VCC range; device address 0xA1 (same as 11AA161) | Requires ≥2.5V supply; unsuitable for 1.8V-only systems; identical UNI/O® timing and command set | Select when system rail is fixed at 3.3V/5V and lowest standby current is not critical |
| AT24C128-MAHM-T | I²C interface (2-wire), 128 Kbit capacity, 1.7–5.5V, SOIC-8; no UNI/O® compatibility | Needs two dedicated pins (SCL/SDA); higher pin count and software stack overhead; larger memory for extended logging | Choose only if existing design already uses I²C infrastructure and UNI/O®'s single-pin advantage is unnecessary |
Compared with 11LC161-I/MS, the 11AA161-I/MS enables 1.8V operation and lower standby current, making it superior for battery-powered designs; versus AT24C128-MAHM-T, it saves one GPIO and simplifies firmware but offers less capacity and different protocol stack requirements.
Availability
11AA161-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply, long-life data retention, and compact single-pin serial interface solutions.
Supply support for 11AA161-I/MS 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 components, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The 11AAxxx family was designed specifically for ultra-low-pin-count embedded systems needing reliable, low-voltage serial EEPROM with minimal PCB footprint and simplified firmware integration via UNI/O®.
FAQ
What is the minimum VCC voltage supported by the 11AA161-I/MS?
The 11AA161-I/MS operates down to 1.8V across its full industrial temperature range (–40°C to +85°C). Below 2.5V, DC specifications such as VIH/VIL shift to accommodate lower rail operation, and active current remains ≤1 mA typical. This makes the 11AA161-I/MS suitable for direct connection to 1.8V microcontrollers without level translation.
How does the 11AA161-I/MS handle power loss during a write cycle?
The 11AA161-I/MS incorporates built-in power-loss write protection that automatically resets the write enable latch (WEL) on power-on or brown-out reset (POR/BOR). Combined with self-timed write completion and auto-erase, this ensures no partial writes occur - the 11AA161-I/MS either completes the full byte/page write or aborts cleanly, preserving data integrity.
Can multiple 11AA161-I/MS devices share the same UNI/O® bus?
Yes - the 11AA161-I/MS uses hardwired device address 0xA1 (10100001), distinct from 11AA160 (0xA0). Up to two devices (one 11AA160 and one 11AA161-I/MS) can coexist on the same SCIO line without address conflict, enabling dual-parameter storage in space-constrained designs.
What is the purpose of the NC pins on the 11AA161-I/MS MSOP package?
The 11AA161-I/MS MSOP package has five NC pins (pins 1, 2, 3, 6, 7) - all internally unconnected. They serve mechanical stability and thermal dissipation roles but carry no electrical function. Per Microchip's layout guidelines, these pins may be left floating or tied to VSS for improved thermal performance; no external connections are required for functional operation of the 11AA161-I/MS.
Does the 11AA161-I/MS support sequential reads across page boundaries?
Yes - the 11AA161-I/MS features an auto-incrementing internal address pointer. After issuing a READ or CRRD command, each MAK from the master advances the pointer by one byte, allowing seamless sequential reads across all 2,048 addresses regardless of page boundaries. The pointer rolls over from 0x07FF to 0x0000, ensuring continuous streaming capability for the 11AA161-I/MS.
11AA161-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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-MSOP
11AA161-I/MS FAQ
1.How can I place an order for 11AA161-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 11AA161-I/MS 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 11AA161-I/MS reliable?
The price and inventory of 11AA161-I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 11AA161-I/MS is usually 5 days.
3.What payment methods are accepted for 11AA161-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 11AA161-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 11AA161-I/MS?
11AA161-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 11AA161-I/MS 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 11AA161-I/MS?
For technical support, including 11AA161-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 11AA161-I/MS requirements.
6.How does Aetrix verify that 11AA161-I/MS is sourced from the original manufacturer or authorized distributors?
All 11AA161-I/MS 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 11AA161-I/MS meets industry standards.
7.What is the process for return or replacement of 11AA161-I/MS?
All 11AA161-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 11AA161-I/MS, 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 11AA161-I/MS part is unused and in its original packaging.
Return procedure for 11AA161-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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