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Microchip Technology 11AA161-I/SN
- Part No.:
- 11AA161-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
11AA161-I/SN.pdf
- Description:
- IC EEPROM 16KBIT SGL WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,850
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Product details
Overview
11AA161-I/SN 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 in industrial controllers and sensor nodes.
For engineers reviewing the 11AA161-I/SN datasheet, 11AA161-I/SN pinout, 11AA161-I/SN application, or 11AA161-I/SN equivalent, key selection considerations include its 1.8V minimum supply, UNI/O® bus timing tolerance (±0.5% frequency drift per byte), STATUS register access for WIP/WEL monitoring, and SOT-23-3 package compatibility with legacy footprint designs.
Technical Context
The 11AA161-I/SN implements Manchester-encoded UNI/O® protocol over a single bidirectional SCIO line, eliminating need for separate clock and data lines. Its internal re-synchronization circuitry tracks master bit period (10–100 µs) and tolerates ±0.06 UI input edge jitter and ±5% total frequency deviation per command.
It integrates a 16-byte page latch, STATUS register with WIP/WEL/BP bits, and hardware block protection (none/¼/½/all array). Write cycles are self-timed (max 10 ms), with endurance of 1 million cycles and >200-year data retention at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Density | 16 Kbit (2,048 × 8 organization) - supports full memory map access with 15-bit addressing |
| VCC Range | 1.8V to 5.5V - enables direct interfacing with 1.8V/3.3V/5V microcontrollers without level shifters |
| Interface | Single I/O UNI/O® bus (SCIO only) - reduces PCB routing complexity and pin count vs. I²C/SPI |
| Page Size | 16 bytes - allows efficient burst writes within physical page boundaries (0x00–0x0F, 0x10–0x1F, etc.) |
| Write Cycle Time | Max 10 ms (page or byte) - defines minimum inter-write delay; no external wait-state logic required |
| Standby Current | ≤1 µA at TA = 85°C - critical for battery-powered devices requiring multi-year operation |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in telemetry and logging applications |
Pinout & Package
11AA161-I/SN is packaged in 3-lead SOT-23 (SN suffix), with SCIO, VCC, and VSS terminals. No NC pins - all three leads are functional and electrically defined.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCIO | Serial Clock/Data I/O | Bidirectional Manchester-encoded bus line - carries clock and data; requires external pull-up resistor (typically 4.7 kΩ) |
| VCC | Supply Voltage | Power input (1.8–5.5V); decoupling capacitor (0.1 µF) required within 5 mm of pin |
| VSS | Ground | Reference return path for SCIO and internal circuitry; must connect to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| UNI/O® Single I/O Interface | Reduces MCU GPIO usage to one pin; eliminates clock/data skew issues inherent in multi-line buses |
| Schmitt Trigger Input on SCIO | Provides 50 mV hysteresis (0.05×VCC) - rejects noise spikes up to 50 ns duration without external filtering |
| Output Slope Control | Limiting dV/dt on SCIO output - suppresses ground bounce in high-speed switching environments |
| Status Register Access | Real-time read of WIP (write-in-progress) and WEL (write-enable latch) bits - enables non-blocking firmware polling |
| Block Write Protection | Configurable via BP0/BP1 bits to protect 0%, 25%, 50%, or 100% of memory - prevents accidental overwrite of critical calibration data |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 200-year retention; accessed during power-up initialization using UNI/O® start header synchronization. Use Value: Eliminates need for external trimming components and enables field recalibration without hardware modification. |
Use Scenario: Holding user-selectable therapy parameters and device ID in portable infusion pumps. IC Role / Device Role / Timing Role: Secure configuration store with block protection - BP1/BP0 set to lock first 25% of array containing safety-critical defaults. Use Value: Prevents unauthorized runtime modification while allowing clinical staff to update operational settings via authenticated interface. |
| Automotive Body Control Module | Smart Meter Firmware Settings |
Use Scenario: Retaining seat/mirror position memory and lighting presets across ignition cycles in 12V automotive systems. IC Role / Device Role / Timing Role: Low-voltage EEPROM (1.8V min) interfaced directly to 3.3V MCU GPIO; withstands cold-crank voltage dips down to 1.8V. Use Value: Maintains user preferences without backup battery or supercapacitor support. |
Use Scenario: Storing tariff schedules, pulse constants, and communication keys in ANSI C12.19-compliant electricity meters. IC Role / Device Role / Timing Role: High-reliability data logger with 1M endurance - endures daily firmware parameter updates over 10+ year service life. Use Value: Meets ANSI/IEC long-term data integrity requirements without periodic replacement or refresh cycles. |
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/SN | Same density and UNI/O® interface, but VCC range 2.5–5.5V only; device address 0xA1 (same as 11AA161) | Not suitable for 1.8V or 2.5V-only systems; requires level-shifting when paired with sub-2.5V MCUs | Select 11LC161-I/SN only if system VCC ≥2.5V and no low-voltage operation is needed. |
| AT24C128B-PU | I²C interface (2-wire), 128 Kbit capacity, 1.7–5.5V supply; no UNI/O® or STATUS register | Requires two dedicated MCU pins (SCL/SDA); lacks built-in write-in-progress flag - needs timeout-based polling | Choose AT24C128B-PU when higher density or standard I²C ecosystem compatibility outweighs pin-count savings. |
Compared with 11LC161-I/SN, the 11AA161-I/SN enables true 1.8V operation and simplifies layout in ultra-low-pin-count designs; versus AT24C128B-PU, it trades density and protocol ubiquity for single-pin interface and real-time WIP status visibility.
Availability
11AA161-I/SN is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics equipment, and automotive body electronics requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for 11AA161-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 manufacturer specializing in microcontrollers, analog devices, and memory products for embedded control applications.
The 11AA161-I/SN belongs to Microchip's UNI/O® Serial EEPROM family, designed specifically for space- and pin-constrained systems where minimal MCU GPIO usage and robust noise immunity are essential.
FAQ
What is the minimum operating voltage for the 11AA161-I/SN?
The 11AA161-I/SN operates down to 1.8V across its full industrial temperature range (–40°C to +85°C). Below 2.5V, DC characteristics specify VIL ≤ 0.2×VCC and VIH ≥ 0.7×VCC, ensuring reliable logic thresholds even at lowest supply. This enables direct connection to 1.8V microcontrollers without level translation.
How does the 11AA161-I/SN handle write-in-progress detection?
The 11AA161-I/SN provides real-time status via its STATUS register, where the WIP (Write-In-Progress) bit is readable at any time-even during active write cycles. Firmware can poll this bit using the RDSR instruction (0x05) without halting other operations, avoiding fixed timeouts and improving system responsiveness compared to blind delay-based approaches.
Can the 11AA161-I/SN be used on the same bus as 11AA160-I/SN devices?
Yes. The 11AA161-I/SN uses device address 0xA1, while 11AA160-I/SN uses 0xA0 - both share the same 4-bit family code '1010' but differ in the hardwired device code ('0001' vs. '0000'). This allows coexistence on a single UNI/O® bus without address conflict, enabling mixed-density memory configurations.
What package options are available for the 11AA161-I/SN besides SOT-23?
In addition to the SOT-23-3 (SN) package shown in the part number, the 11AA161-I/SN is also offered in PDIP-8 (P), SOIC-8 (SN variant), MSOP-8 (MS), TDFN-8 (MN), TO-92 (TO), and Chip Scale (CS) packages. All share identical electrical specifications and UNI/O® timing behavior, differing only in mechanical form factor and thermal performance.
Does the 11AA161-I/SN support page write across memory boundaries?
No. Page write operations in the 11AA161-I/SN are strictly confined within 16-byte physical pages (e.g., 0x00–0x0F, 0x10–0x1F). Attempting to write across a boundary causes automatic rollover to the start of the current page, overwriting prior data. Firmware must validate address alignment before initiating multi-byte writes to prevent unintended corruption.
11AA161-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
11AA161-I/SN FAQ
1.How can I place an order for 11AA161-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 11AA161-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 11AA161-I/SN reliable?
The price and inventory of 11AA161-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 11AA161-I/SN is usually 5 days.
3.What payment methods are accepted for 11AA161-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 11AA161-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 11AA161-I/SN?
11AA161-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 11AA161-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 11AA161-I/SN?
For technical support, including 11AA161-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 11AA161-I/SN requirements.
6.How does Aetrix verify that 11AA161-I/SN is sourced from the original manufacturer or authorized distributors?
All 11AA161-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 11AA161-I/SN meets industry standards.
7.What is the process for return or replacement of 11AA161-I/SN?
All 11AA161-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 11AA161-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 11AA161-I/SN part is unused and in its original packaging.
Return procedure for 11AA161-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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