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Microchip Technology 11AA161-I/P
- Part No.:
- 11AA161-I/P
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
11AA161-I/P.pdf
- Description:
- IC EEPROM 16KBIT SGL WIRE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,989
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Product details
Overview
11AA161-I/P from Microchip Technology is a 16 Kbit (2,048 × 8) serial EEPROM with UNI/O® single I/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.
For engineers reviewing the 11AA161-I/P datasheet, 11AA161-I/P pinout, 11AA161-I/P application, or 11AA161-I/P equivalent, key selection considerations include its 1.8V minimum supply, UNI/O® bus timing tolerance (±0.5% frequency drift per byte), 1 M erase/write cycle endurance, >200-year data retention, and compatibility with microcontroller GPIO-based serial interfaces requiring minimal pin count.
Technical Context
The 11AA161-I/P implements Manchester-encoded UNI/O® protocol over a single bidirectional SCIO line, eliminating need for separate clock or chip-select signals. Its internal re-synchronization circuitry tracks master bit period (10–100 µs) and tolerates ±0.06 UI input edge jitter and ±5% cumulative frequency deviation per command.
It integrates a status register with WIP and WEL flags, block protection bits (BP0/BP1), and hardware write protection including power-on/off circuitry and write-enable latch control. Memory access uses an auto-incrementing address pointer supporting sequential read/write and current-address read (CRRD) modes.
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 |
| Supply Voltage | 1.8V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V logic domains without level shifting |
| Interface | Single I/O UNI/O® bus - reduces MCU pin count and PCB routing complexity versus SPI/I²C |
| Page Size | 16 bytes - allows efficient burst writes within one physical page boundary (0x00–0x0F, 0x10–0x1F, etc.) |
| Write Endurance | 1,000,000 cycles - supports frequent field updates such as logging or adaptive tuning parameters |
| Data Retention | >200 years at 85°C - ensures long-term reliability in industrial and automotive environments |
| Standby Current | 1 µA max (I-temp) - critical for battery-powered devices requiring ultra-low quiescent power |
| Bus Speed | 100 kbps (100 kHz equivalent) - compatible with standard GPIO bit-banging implementations on low-end MCUs |
Pinout & Package
11AA161-I/P is housed in an 8-lead PDIP package (P suffix), with pins arranged in dual-inline format for through-hole prototyping and legacy board assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unbonded die pad - must be left floating or tied to VSS per layout guidelines |
| 2 (NC) | No Connect | Unbonded die pad - no electrical function; avoid routing traces to this pin |
| 3 (NC) | No Connect | Unbonded die pad - not internally connected; serves mechanical support only |
| 4 (VSS) | Ground Reference | Primary return path for SCIO signal and internal circuitry; requires low-impedance connection to system ground plane |
| 5 (VCC) | Power Supply | Accepts 1.8–5.5V; bypass capacitor (0.1 µF) required within 10 mm of pin for noise immunity |
| 6 (NC) | No Connect | Unbonded die pad - electrically inactive; may be used for thermal relief if grounded |
| 7 (NC) | No Connect | Unbonded die pad - no signal or power function; ignore in schematic symbol |
| 8 (SCIO) | Serial Clock/Data I/O | Bidirectional Manchester-encoded bus line - requires external pull-up (10 kΩ typical) and supports Schmitt-trigger noise rejection |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger SCIO input | 0.05×VCC hysteresis - rejects high-frequency noise and EMI in noisy industrial environments |
| Output slope control | Controlled rise/fall time - eliminates ground bounce during transitions, improving signal integrity on shared VSS nets |
| Status register access | Real-time WIP/WEL monitoring via RDSR - enables non-blocking polling during write operations without bus contention |
| Block write protection | Configurable BP0/BP1 bits - allows selective locking of 0%, 25%, 50%, or 100% of memory array to prevent accidental overwrite |
| Self-timed write cycle | 5–10 ms typical - removes need for external timing control; device asserts WIP until internal programming completes |
| ESD protection | >4,000 V HBM - meets IEC 61000-4-2 Level 2 requirements for robust handling in manufacturing and field service |
Applications
| Smart Sensor Calibration | Industrial PLC Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and temperature compensation tables in MEMS pressure sensors. 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 SPI EEPROM or costly ASIC integration, reducing BOM count while maintaining traceability across production lots. |
Use Scenario: Holding user-defined I/O mapping, alarm thresholds, and communication protocol settings in modular programmable logic controllers. IC Role / Device Role / Timing Role: Configuration memory accessed during boot and runtime via GPIO-bit-banged UNI/O® interface. Use Value: Enables secure, field-upgradable settings without MCU firmware changes; block protection prevents corruption during brown-out conditions. |
| Medical Device Settings | Automotive Body Control Module |
Use Scenario: Retaining patient-specific therapy parameters and usage logs in portable infusion pumps and diagnostic handhelds. IC Role / Device Role / Timing Role: Low-power (1 µA standby) data logger backup memory synchronized to MCU sleep/wake cycles. Use Value: Extends battery life in Class II medical devices while meeting IEC 60601-1 leakage current limits and data integrity requirements. |
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in vehicle body control units with 12V supply regulation. IC Role / Device Role / Timing Role: 1.8–5.5V tolerant EEPROM interfaced directly to 3.3V MCU GPIO, surviving load-dump transients via built-in power-supply protection. Use Value: Reduces system cost vs. CAN-based configuration storage; UNI/O® simplifies wiring harness design by eliminating dedicated clock lines. |
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/P | Same density and UNI/O® interface but 2.5–5.5V VCC range; device address 0xA1; automotive temp option available | Requires ≥2.5V supply; unsuitable for 1.8V-only systems; supports extended temperature (–40°C to +125°C) | Select when higher supply voltage stability or AEC-Q100 compliance is required; not drop-in for 1.8V designs |
| 25AA160-I/P | 16 Kbit SPI EEPROM; 8-pin SOIC; 1.8–5.5V; 5 MHz max clock; no UNI/O®; uses CS/SCK/SDI/SDO pins | Needs 4 MCU pins instead of 1; faster random access but higher pin count and layout complexity | Choose when existing SPI infrastructure exists or higher throughput (>100 kbps) is needed; incompatible bus protocol |
Compared with 11LC161-I/P and 25AA160-I/P, the 11AA161-I/P uniquely balances ultra-low-voltage operation (1.8V), single-pin UNI/O® simplicity, and industrial-grade reliability-making it optimal for pin-constrained, battery-sensitive, or cost-driven embedded systems where SPI overhead is prohibitive.
Availability
11AA161-I/P is available at Aetrix Electronics and suitable for smart sensor calibration, industrial PLC configuration, and medical device settings requiring stable component supply across multi-year production cycles.
Supply support for 11AA161-I/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 11AA161-I/P belongs to Microchip's 11XX UNI/O® Serial EEPROM family, designed specifically for ultra-low-pin-count, low-power, and space-constrained systems needing reliable nonvolatile storage without complex interface logic.
FAQ
What is the minimum supply voltage required for reliable operation of the 11AA161-I/P?
The 11AA161-I/P operates reliably down to 1.8V across the full industrial temperature range (–40°C to +85°C). Below 2.5V, the input threshold shifts to 0.2×VCC for VIL and 0.3×VCC for VIH to maintain noise margin. This 1.8V capability enables direct integration with modern low-voltage MCUs and battery-powered devices without level-shifting circuitry.
How does the UNI/O® interface of the 11AA161-I/P differ from standard I²C or SPI protocols?
The 11AA161-I/P uses a patented single-wire UNI/O® bus with Manchester encoding, requiring only one bidirectional I/O line (SCIO) and ground-no separate clock, chip-select, or data lines. Unlike I²C or SPI, it embeds timing in the data stream, eliminating clock skew concerns and enabling use with any GPIO-capable MCU, even those lacking dedicated serial peripherals.
Can the 11AA161-I/P be used in automotive applications?
The 11AA161-I/P is rated for industrial temperature (–40°C to +85°C) only. For automotive applications requiring –40°C to +125°C operation, Microchip offers the pin-compatible 11LC161-E/P variant. The 11AA161-I/P itself is not qualified to AEC-Q100 and lacks automotive-grade screening or extended temperature validation.
What is the purpose of the NC pins on the 11AA161-I/P PDIP package?
The 11AA161-I/P PDIP package has five NC (No Connect) pins (1, 2, 3, 6, 7) - all unconnected to the die. These serve mechanical stabilization and mold compound anchoring functions. They must remain unconnected in the schematic and layout; grounding or routing to them may cause parasitic coupling or violate Microchip's recommended footprint guidelines.
How does the 11AA161-I/P handle write protection during power transitions?
The 11AA161-I/P incorporates built-in power-on/off write protection circuitry that automatically disables writes when VCC drops below 1.25V or rises above 1.25V during ramp-up. This, combined with the write-enable latch (WEL) and block protection bits (BP0/BP1), ensures no unintended writes occur during brown-out, reset, or power cycling events - preserving data integrity without external supervision.
11AA161-I/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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
11AA161-I/P FAQ
1.How can I place an order for 11AA161-I/P through Aetrix?
Please submit a Request for Quotation (RFQ) for 11AA161-I/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 11AA161-I/P reliable?
The price and inventory of 11AA161-I/P 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/P is usually 5 days.
3.What payment methods are accepted for 11AA161-I/P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 11AA161-I/P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 11AA161-I/P?
11AA161-I/P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 11AA161-I/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 11AA161-I/P?
For technical support, including 11AA161-I/P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 11AA161-I/P requirements.
6.How does Aetrix verify that 11AA161-I/P is sourced from the original manufacturer or authorized distributors?
All 11AA161-I/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 11AA161-I/P meets industry standards.
7.What is the process for return or replacement of 11AA161-I/P?
All 11AA161-I/P units undergo pre-shipment inspection (PSI). If there is an issue with 11AA161-I/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 11AA161-I/P part is unused and in its original packaging.
Return procedure for 11AA161-I/P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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