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Microchip Technology 93AA46AT-I/MS
- Part No.:
- 93AA46AT-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93AA46AT-I/MS.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,185
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Product details
Overview
93AA46AT-I/MS from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating across 1.8–5.5 V, rated for industrial temperature (−40°C to +85°C), and housed in an 8-lead MSOP package. It features self-timed erase/write cycles, automatic erase-all-before-write-all (ERAL/WRAL), and power-on/off data protection - used for configuration storage in embedded microcontroller systems, sensor calibration registers, and power-management settings.
For engineers reviewing the 93AA46AT-I/MS datasheet, 93AA46AT-I/MS pinout, 93AA46AT-I/MS application, or 93AA46AT-I/MS equivalent, this page delivers verified technical context, pin-level design meaning, real-world use scenarios, and validated alternative options - all grounded in Microchip's DS20001749K specification and package documentation.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins, supporting dedicated 8-bit organization (no ORG pin). Its internal logic includes auto-erase-before-write, ERAL/WRAL command execution, and Ready/Busy status reporting via DO pin polling during programming.
It uses CMOS technology with on-chip voltage detection (VPOR = 1.5 V typical), supports up to 3 MHz clock frequency at VCC ≥ 4.5 V, and guarantees 1,000,000 erase/write cycles with >200 years data retention - optimized for nonvolatile memory tasks where low standby current (1 µA max) and robust power-fail immunity are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin; no word-size reconfiguration. |
| VCC range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V logic domains without level shifters. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - requires no additional control lines; supports daisy-chaining only via external multiplexing. |
| Write endurance | 1,000,000 cycles - ensures long-term reliability in firmware update or calibration logging applications. |
| Data retention | >200 years at 25°C - qualifies for permanent storage of factory-trimmed coefficients or security keys. |
| Standby current | 1 µA maximum (I-temp) - minimizes quiescent power draw in battery-backed or energy-harvesting systems. |
| Operating temperature | −40°C to +85°C (Industrial grade) - validated for deployment in industrial controllers and automotive body electronics. |
Pinout & Package
8-lead MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating), Pb-free Matte Tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge (93AA/93LC). |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising-edge sampling for DI/DO; stoppable mid-sequence without corruption. |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and write data; tied high with CS to detect Start condition. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or after status read. |
| 5 (VSS) | Ground | Reference for all I/O and internal circuitry; connect exposed pad to VSS if used for thermal/mechanical stability. |
| 6 (NC) | No Connection | Internally unconnected; must be left floating or tied to VSS per layout best practice - not usable as strap or control. |
| 7 (ORG) | Organization Select | Not present on 93AA46A devices - pin is NC; unused and must not be driven or terminated. |
| 8 (VCC) | Power Supply | Supplies core and I/O; includes on-chip POR detection at ~1.5 V - prevents spurious writes during brownout. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - internal cycle completes in ≤6 ms (TWC), freeing MCU resources. |
| Automatic ERAL before WRAL | Ensures full array readiness before bulk write - removes requirement for separate ERAL command in firmware flow. |
| Power-on/off data protection | Hardware-enforced write inhibition below VPOR (1.5 V) - prevents corruption during power ramp-up/down. |
| Ready/Busy status via DO | Enables non-blocking polling instead of fixed delays - reduces worst-case write latency by up to 40% in responsive systems. |
| Industry-standard Microwire interface | Direct compatibility with legacy PIC® MCU SPI peripherals configured for Microwire mode - no protocol translation needed. |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-calibrated gain/offset coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed at boot; read-only during runtime; write-once-per-calibration. Use Value: Eliminates need for external trimming components; enables field recalibration with traceable versioning via WRAL+addressed writes. |
Use Scenario: Holding user-configurable settings (e.g., display brightness, communication baud rate, alarm thresholds) in medical diagnostic equipment. IC Role / Device Role / Timing Role: Low-power configuration register bank; updated infrequently; accessed via MCU GPIO-banged or hardware SPI. Use Value: Survives AC power loss and battery replacement; retains settings across firmware updates without host-side backup logic. |
| Power Management Unit (PMU) Trim | Automotive Body Control Module (BCM) |
Use Scenario: Storing voltage reference trims for DC-DC converters in telecom power supplies. IC Role / Device Role / Timing Role: Factory-programmed one-time storage; read at power-on reset; never rewritten in field. Use Value: Achieves ±0.5% output regulation without laser trimming; supports multi-rail PMU calibration with single 1-Kbit footprint. |
Use Scenario: Retaining seat position memory, mirror fold/unfold state, and lighting profiles in entry-level BCMs. IC Role / Device Role / Timing Role: Persistent state storage interfaced to 8-bit MCU via 3-wire bus; operates across −40°C to +85°C ambient. Use Value: Meets AEC-Q100 stress test requirements for data integrity; withstands automotive load-dump transients due to on-chip voltage monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46AT-I/MS | Same 128 × 8-bit organization, but VCC min = 2.5 V; lacks 1.8 V operation capability. | Not suitable for 1.8 V systems; otherwise identical pinout, timing, and instruction set. | Select only if system VCC never drops below 2.5 V - avoids risk of inadvertent writes during low-VCC brownout. |
| AT25010B-MAHL-T | 1 Kbit SPI EEPROM (4-wire), 1.8–5.5 V, 20 MHz max clock; no ERAL/WRAL commands. | Requires separate CS + SI/SO pins; no built-in erase-all-before-write-all - firmware must manage sector erases. | Choose when higher throughput (SPI vs Microwire) or broader distributor availability outweighs integrated ERAL/WRAL convenience. |
Compared with 93LC46AT-I/MS, the 93AA46AT-I/MS enables true 1.8 V operation and tighter brownout protection; compared with AT25010B-MAHL-T, it reduces MCU GPIO count and simplifies firmware by embedding ERAL/WRAL - critical for resource-constrained 8-bit controllers.
Availability
93AA46AT-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded configuration storage, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93AA46AT-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX46 family was designed specifically for cost-sensitive, low-power nonvolatile memory applications in space-constrained embedded systems - emphasizing simplicity, reliability, and broad voltage compatibility over high-speed performance.
FAQ
What is the memory organization of the 93AA46AT-I/MS?
The 93AA46AT-I/MS is a fixed 128 × 8-bit (1 Kbit) EEPROM with no ORG pin - it exclusively supports 8-bit word access. Unlike 'C' variants, it does not support 16-bit mode or external word-size selection. This simplifies firmware implementation and eliminates configuration errors related to ORG pin strapping.
Does the 93AA46AT-I/MS support 1.8 V operation?
Yes, the 93AA46AT-I/MS operates across 1.8 V to 5.5 V, making it compatible with modern ultra-low-power microcontrollers and sensors. Its voltage detect threshold (VPOR ≈ 1.5 V) ensures write inhibition during brownout conditions common in 1.8 V systems - a key differentiator from 93LC46A (min 2.5 V).
How is Ready/Busy status monitored on the 93AA46AT-I/MS?
During erase or write cycles, the DO pin outputs Ready/Busy status: logic low indicates ongoing operation; logic high signals completion. To read status, CS must be brought high for ≥250 ns after TCSL, then sampled on subsequent CLK edges - no additional command is required beyond standard instruction sequencing.
What is the purpose of the NC pin on the 93AA46AT-I/MS MSOP package?
Pin 6 on the 93AA46AT-I/MS is labeled NC (No Connection) - it has no internal connection and must remain unconnected. It is not a reserved function pin nor a thermal pad; tying it to VSS or VCC may cause undefined behavior. Layout guidelines require leaving it floating or optionally grounding it for mechanical stability only.
Can the 93AA46AT-I/MS perform bulk erase and write in a single command?
Yes - the WRAL (Write All) command executes an automatic ERAL (Erase All) followed by full-array programming using the supplied data byte. This occurs in one atomic operation with guaranteed data integrity, eliminating race conditions that could arise from separate ERAL+WRITE sequences in firmware.
93AA46AT-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 6ms
- 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
93AA46AT-I/MS FAQ
1.How can I place an order for 93AA46AT-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46AT-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 93AA46AT-I/MS reliable?
The price and inventory of 93AA46AT-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 93AA46AT-I/MS is usually 5 days.
3.What payment methods are accepted for 93AA46AT-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46AT-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46AT-I/MS?
93AA46AT-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46AT-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 93AA46AT-I/MS?
For technical support, including 93AA46AT-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46AT-I/MS requirements.
6.How does Aetrix verify that 93AA46AT-I/MS is sourced from the original manufacturer or authorized distributors?
All 93AA46AT-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 93AA46AT-I/MS meets industry standards.
7.What is the process for return or replacement of 93AA46AT-I/MS?
All 93AA46AT-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46AT-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 93AA46AT-I/MS part is unused and in its original packaging.
Return procedure for 93AA46AT-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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