My Inquiry
My Account
Microchip Technology 11AA161T-I/TT
- Part No.:
- 11AA161T-I/TT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
11AA161T-I/TT.pdf
- Description:
- IC EEPROM 16KBIT SGL WIRE SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:8,707
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
11AA161T-I/TT from Microchip Technology is a 16 Kbit (2,048 × 8) serial EEPROM using the UNI/O® single I/O bus interface. It operates from 1.8V to 5.5V, draws ≤1 µA standby current, supports 100 kbps Manchester-encoded communication, and features 16-byte page write buffering with built-in block write protection for industrial temperature applications (–40°C to +85°C). It is used in space-constrained embedded systems requiring nonvolatile parameter storage with minimal pin count.
For engineers reviewing the 11AA161T-I/TT datasheet, 11AA161T-I/TT pinout, 11AA161T-I/TT application, or 11AA161T-I/TT equivalent, key selection considerations include its 1.8V low-voltage operation, SOT-23-3 package compatibility, UNI/O® protocol timing constraints (e.g., ±0.5% frequency drift tolerance per byte), STATUS register monitoring capability, and 1 M erase/write cycle endurance.
Technical Context
The 11AA161T-I/TT implements a Manchester-encoded, master-controlled UNI/O® bus where clock and data share the SCIO line. Its internal architecture includes a 16-byte page latch, STATUS register with WIP/WEL/BP bits, and re-synchronization circuitry tolerant of ±0.06 UI input edge jitter and ±0.5% bus frequency drift per byte.
It uses Schmitt-trigger inputs and slope-controlled output drivers to suppress noise and eliminate ground bounce. Write operations are self-timed (max. 10 ms), require prior WREN activation, and support block protection covering none, 1/4, 1/2, or all memory - enforced via nonvolatile BP0/BP1 bits in the STATUS register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Density | 16 Kbit (2,048 × 8 organization) - supports up to 2 KB of persistent configuration or calibration data |
| VCC Range | 1.8V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifting |
| Standby Current | ≤1 µA at 85°C - critical for battery-powered devices requiring multi-year shelf life |
| Write Endurance | 1,000,000 cycles - ensures reliable field updates over product lifetime in firmware parameter storage |
| Data Retention | >200 years - guarantees long-term integrity of stored calibration coefficients or security keys |
| UNI/O® Bit Rate | 100 kbps (100 kHz equivalent) - defines maximum sustained throughput for sequential reads/writes |
| Page Size | 16 bytes - constrains efficient bulk writes to aligned 16-byte boundaries; crossing boundaries wraps within page |
| Temp Range | Industrial: –40°C to +85°C - qualified for use in industrial control, metering, and automotive cabin modules |
Pinout & Package
11AA161T-I/TT is packaged in a 3-lead SOT-23 (TT) package with top-side marking "161T" and pin 1 identified by a dot. Pin assignments are validated per DS22067J-page 2 pin function table and Microchip's official package drawings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SCIO) | Serial Clock/Data I/O | Manchester-encoded bidirectional bus line - requires external pull-up; handles both clock recovery and data transfer |
| 2 (VSS) | Ground | Reference return path for internal logic and SCIO driver - must be low-impedance to minimize ground bounce |
| 3 (VCC) | Supply Voltage | Power input for EEPROM core and interface logic - bypass capacitor (0.1 µF) required near pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Single I/O UNI/O® Interface | Reduces MCU GPIO usage to one pin plus VCC/VSS, eliminating need for dedicated SPI/I²C peripherals in resource-limited designs |
| Schmitt Trigger Inputs | Provides ≥50 mV hysteresis on SCIO, enabling robust operation in electrically noisy environments like motor drives or power supplies |
| Output Slope Control | Actively limits dV/dt on SCIO transitions to prevent ground bounce-induced logic errors during high-speed writes |
| Status Register Monitoring | Allows real-time polling of WIP bit via RDSR command - eliminates fixed delay waits and improves system responsiveness |
| Block Write Protection | Configurable via BP0/BP1 bits to lock 0%, 25%, 50%, or 100% of memory - prevents accidental overwrite of critical firmware parameters |
| Power-On Write Protection | Hardware-enforced disable of writes until explicit WREN command - prevents corruption during brown-out or reset conditions |
Applications
| Smart Sensor Calibration Storage | Industrial PLC Configuration Backup |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients and temperature compensation tables in MEMS pressure sensors. IC Role / Device Role / Timing Role: Nonvolatile parameter repository accessed during sensor power-up; read once per boot using CRRD for fastest retrieval. Use Value: Enables plug-and-play sensor replacement without host recalibration; 200-year retention ensures data integrity across product lifecycle. |
Use Scenario: Preserving user-defined I/O mapping, PID loop settings, and alarm thresholds in DIN-rail programmable logic controllers. IC Role / Device Role / Timing Role: System-level configuration vault; written infrequently but read on every cold start via READ with address 0x0000. Use Value: Eliminates need for battery-backed RAM; 1.8V operation allows direct connection to 3.3V PLC power rail with no regulator. |
| Medical Device Usage Logs | Automotive Body Control Module Settings |
Use Scenario: Recording cumulative operating hours, error counters, and maintenance intervals in portable infusion pumps. IC Role / Device Role / Timing Role: Event-triggered write storage; uses page-write buffer to log timestamped entries with minimal bus occupancy. Use Value: 1M endurance supports >10 years of daily logging at 300 writes/year; ESD rating >4 kV withstands handling in clinical environments. |
Use Scenario: Saving user preferences (mirror position, seat memory, lighting profiles) in automotive BCMs. IC Role / Device Role / Timing Role: Low-power configuration keeper; enters standby mode (<1 µA) between ignition cycles to preserve battery charge. Use Value: SOT-23-3 footprint minimizes PCB area in space-constrained BCM modules; -40°C to +85°C rating covers under-hood thermal range. |
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/TT | Same 16 Kbit density and SOT-23-3 package, but device address 0xA0 (vs. 0xA1); no functional difference in operation or timing | Shares identical pinout and protocol - interoperable on same UNI/O® bus if only one device present | Select when legacy design uses 0xA0 addressing or when consolidating BOMs across 11AA160/11AA161 variants |
| AT24C128-MAHM-T | I²C interface (2-wire), 128 Kbit capacity, SOIC-8 package; requires two GPIOs and external pull-ups | Higher density but larger footprint and different protocol stack - necessitates firmware and layout changes | Choose when migrating to higher-capacity storage and I²C infrastructure already exists; not drop-in compatible |
Compared with 11AA161T-I/TT, the 11AA160T-I/TT offers identical electrical and mechanical behavior with only a device address variation, while the AT24C128-MAHM-T trades pin efficiency for capacity and mandates protocol redesign - making the former a seamless alternative and the latter a system-level upgrade path.
Availability
11AA161T-I/TT is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and automotive body electronics requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for 11AA161T-I/TT 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 Flash-IP solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The 11AA161T-I/TT belongs to Microchip's 11XX family of UNI/O® serial EEPROMs, designed specifically for ultra-low-pin-count embedded systems where minimizing GPIO usage and board space is critical without sacrificing reliability or voltage flexibility.
FAQ
What is the device address of the 11AA161T-I/TT and how does it differ from other 11XX parts?
The 11AA161T-I/TT has a hardwired device address of 0xA1 (1010 0001), where the family code '1010' is fixed and the device code '0001' distinguishes it from 11AA160T-I/TT (0xA0). This allows both parts to coexist on the same UNI/O® bus without address conflict, enabling mixed-density configurations in a single design. The 11AA161T-I/TT address is confirmed in DS22067J-page 2 Device Selection Table.
Does the 11AA161T-I/TT support 1.8V operation, and what are the implications for active and standby current?
Yes, the 11AA161T-I/TT supports 1.8V to 5.5V operation. At 1.8V, typical active current is 1 mA and max standby current is 1 µA (industrial temp), enabling direct integration into 1.8V SoC subsystems. These values are specified in DS22067J-page 3 DC Characteristics table (D9, D11) and are critical for battery-operated devices where quiescent power dominates lifetime budget.
How does the STATUS register in the 11AA161T-I/TT function, and what bits are accessible?
The 11AA161T-I/TT STATUS register (read via RDSR command 0x05) contains four defined bits: WIP (Write-In-Progress), WEL (Write Enable Latch), BP1, and BP0. Bits 4–7 are don't-care and read as '0'. WIP indicates ongoing write cycles; WEL reflects write permission state; BP1/BP0 configure block protection. All bits except WIP/WEL are nonvolatile and retain settings after power loss, as documented in DS22067J-page 14.
Can the 11AA161T-I/TT perform page writes across memory boundaries, and what happens if it does?
No - the 11AA161T-I/TT enforces strict 16-byte page boundaries. If a page write command attempts to cross a boundary (e.g., writing from address 0x00F to 0x010), data wraps to the start of the same page (0x000), overwriting prior bytes. This behavior is explicitly stated in DS22067J-page 12 Note under Figure 4-3 and requires firmware to validate address alignment before initiating multi-byte writes.
What packaging and marking information identifies the 11AA161T-I/TT in the SOT-23-3 form factor?
The 11AA161T-I/TT is supplied in a 3-lead SOT-23 package (TT suffix), with top-side laser marking showing "161T" and a dot indicating pin 1 (SCIO). Pin 2 is VSS, pin 3 is VCC. This marking and pinout are verified against DS22067J-page 2 package diagrams and Microchip's official SOT-23 mechanical drawing 00002177B.
11AA161T-I/TT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- SOT-23-3
11AA161T-I/TT FAQ
1.How can I place an order for 11AA161T-I/TT through Aetrix?
Please submit a Request for Quotation (RFQ) for 11AA161T-I/TT 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/TT reliable?
The price and inventory of 11AA161T-I/TT 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/TT is usually 5 days.
3.What payment methods are accepted for 11AA161T-I/TT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 11AA161T-I/TT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 11AA161T-I/TT?
11AA161T-I/TT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 11AA161T-I/TT 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/TT?
For technical support, including 11AA161T-I/TT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 11AA161T-I/TT requirements.
6.How does Aetrix verify that 11AA161T-I/TT is sourced from the original manufacturer or authorized distributors?
All 11AA161T-I/TT 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/TT meets industry standards.
7.What is the process for return or replacement of 11AA161T-I/TT?
All 11AA161T-I/TT units undergo pre-shipment inspection (PSI). If there is an issue with 11AA161T-I/TT, 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/TT part is unused and in its original packaging.
Return procedure for 11AA161T-I/TT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
11AA161T-I/TT Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
