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Microchip Technology 93AA46BT-I/MS
- Part No.:
- 93AA46BT-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93AA46BT-I/MS.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,338
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Product details
Overview
93AA46BT-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 packaged in an 8-lead MSOP. It features self-timed erase/write cycles, automatic erase-all-before-write-all, and power-on/off data protection - deployed in microcontroller-based system configuration storage.
For engineers reviewing the 93AA46BT-I/MS datasheet, 93AA46BT-I/MS pinout, 93AA46BT-I/MS application, or 93AA46BT-I/MS equivalent, this page delivers verified electrical specs, package mapping, functional timing behavior, real-world use scenarios, and validated alternative parts for embedded firmware parameter retention and hardware configuration memory.
Technical Context
The 93AA46BT-I/MS implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins, supporting dedicated 8-bit organization (no ORG pin). Its internal architecture includes address decoder, mode decode logic, and output buffer, enabling sequential read, ERASE, WRITE, ERAL, and WRAL instructions with Ready/Busy status signaled via DO pin during programming.
It uses advanced CMOS technology for ultra-low standby current (≤1 µA at I-temp), supports clock frequencies up to 3 MHz (VCC ≥ 4.5 V), and integrates on-chip voltage detection (VPOR = 1.5 V typical) for automatic write inhibition below safe supply thresholds - ensuring data integrity during brown-out conditions.
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 microcontrollers without level shifters. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - requires only three MCU GPIOs and no additional protocol stack. |
| Write Cycle Time | 6 ms max (TWC) - self-timed; eliminates need for external timing control or polling overhead beyond R/B status check. |
| Data Retention | >200 years - ensures long-term reliability for infrequently updated configuration data in unattended systems. |
| Endurance | 1,000,000 erase/write cycles - supports frequent calibration or runtime parameter logging in industrial controllers. |
| Temp Range | −40°C to +85°C (Industrial grade) - qualified for deployment in factory automation, HVAC, and metering equipment. |
Pinout & Package
8-lead MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, Pb-free Matte Tin finish. Pin 1 marked by laser dot; exposed pad optional (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; device enters Standby mode when low; minimum 250 ns low time required between commands. |
| CLK | Serial Clock | Synchronizes all data transfers; rising-edge sampling of DI and DO; stoppable at any point without corruption. |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; must be stable before first CLK rising edge after CS high. |
| DO | Data Output / R/B Status | Outputs read data or Ready/Busy signal; low = busy, high = ready; enters High-Z when CS low or not reading. |
| VSS | Ground | Reference for all digital and analog circuitry; must be low-impedance connection to minimize noise coupling. |
| NC | No Internal Connection | Pin 7 in MSOP - unused; may be left floating or tied to ground per board layout best practice. |
| VCC | Power Supply | Supplies core logic and memory array; internal POR circuit disables writes below 1.5 V typical threshold. |
| ORG | Organization Select | Not present on 93AA46B variants - permanently configured for 16-bit operation; pin 6 is NC on this part. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write Cycles | Eliminates external timing components and software delay loops; full cycle completes in ≤6 ms with automatic erase-before-write. |
| Automatic ERAL Before WRAL | WRAL instruction internally triggers full-array erase prior to write - prevents partial overwrite corruption without separate ERAL command. |
| Power-On/Off Data Protection | Hardware-level write inhibit below 1.5 V VCC threshold - prevents inadvertent writes during power ramp-up/down or brown-out events. |
| Ready/Busy Status via DO Pin | Enables efficient polling instead of fixed delays; reduces CPU wait time and improves system responsiveness during non-blocking operations. |
| Sequential Read Function | Allows continuous address incrementing while CS remains high - simplifies bulk read of configuration blocks with minimal command overhead. |
Applications
| Smart Meter Configuration Storage | Industrial PLC Parameter Backup |
|---|---|
|
Use Scenario: Storing tariff tables, calibration coefficients, and utility-specific settings in electricity/water/gas meters with 10+ year field life. IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding persistent parameters accessed at boot and updated during firmware upgrades or field commissioning. Use Value: 1M endurance and >200-year data retention ensure reliable operation across meter lifetime without battery backup or refresh cycles. |
Use Scenario: Retaining I/O mapping, PID tuning values, and safety thresholds in programmable logic controllers deployed in manufacturing lines. IC Role / Device Role / Timing Role: Dedicated 8-bit serial EEPROM interfaced directly to ARM Cortex-M or PIC MCU SPI/Microwire peripheral. Use Value: 1.8–5.5 V operation allows seamless integration with both legacy 5 V and modern low-power 3.3 V/1.8 V controller rails. |
| Medical Device Calibration Memory | Automotive Body Control Module Settings |
|
Use Scenario: Storing sensor offset/gain values and regulatory compliance logs in portable diagnostic equipment requiring traceable calibration history. IC Role / Device Role / Timing Role: Microwire EEPROM accessed during startup to load calibrated ADC reference points and user-adjustable operational limits. Use Value: Industrial temperature rating (−40°C to +85°C) and RoHS compliance meet medical-grade environmental and regulatory requirements. |
Use Scenario: Holding seat position presets, mirror fold/unfold states, and lighting profiles in automotive BCMs where space and power are constrained. IC Role / Device Role / Timing Role: Low-quiescent-current (≤1 µA standby) serial memory used alongside CAN/LIN microcontrollers for user preference persistence. Use Value: MSOP package (3.0 × 3.0 mm) minimizes PCB footprint while maintaining compatibility with automated SMT assembly processes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46BT-I/MS | Same 128 × 8-bit organization and MSOP-8 package, but wider VCC range starts at 2.5 V (vs. 1.8 V); lacks 1.8 V compatibility. | Not suitable for 1.8 V systems (e.g., ultra-low-power IoT sensors); otherwise identical pinout and instruction set. | Select 93LC46BT-I/MS only if system VCC never drops below 2.5 V and 1.8 V operation is unnecessary. |
| AT25010B-MAHL-T | 1 Kbit SPI EEPROM (SPI mode only), 1.8–5.5 V, SOIC-8 package; no Microwire support; different instruction opcodes and timing. | Requires SPI interface instead of Microwire; incompatible clock/data protocol; needs firmware driver rewrite. | Choose only when migrating to SPI-based platforms or when leveraging Atmel's enhanced write-protection features (WP pin, software lock). |
Compared with 93LC46BT-I/MS, the 93AA46BT-I/MS offers true 1.8 V operation critical for battery-powered designs, while AT25010B-MAHL-T introduces SPI dependency and firmware rework - making the 93AA46BT-I/MS optimal for Microwire-native, low-voltage embedded systems requiring drop-in compatibility.
Availability
93AA46BT-I/MS is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical diagnostics, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA46BT-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 93AAxx series was designed specifically for cost-sensitive, low-power embedded systems needing reliable, pin-efficient serial EEPROM - emphasizing voltage flexibility, data integrity, and industrial-grade qualification.
FAQ
What is the memory organization of the 93AA46BT-I/MS?
The 93AA46BT-I/MS is a fixed 128 × 8-bit (1 Kbit) device with no ORG pin - it operates exclusively in x8 mode. Unlike 'C' variants, it does not support x16 configuration. This is confirmed in the Device Selection Table and Pin Function Table of DS20001749K, where 'A' suffix denotes dedicated 8-bit organization. The 93AA46BT-I/MS maintains consistent 8-bit addressing and data transfer across all supported VCC levels.
Does the 93AA46BT-I/MS support 1.8 V operation?
Yes, the 93AA46BT-I/MS fully supports 1.8 V operation across its entire industrial temperature range (−40°C to +85°C), with verified AC and DC characteristics down to 1.8 V. Table 1-2 specifies clock frequency (1 MHz), setup/hold times, and TPD under 1.8 V conditions. This capability is unique to the 'AA' family and distinguishes it from 93LC46BT-I/MS (min 2.5 V) and 93C46BT-I/MS (min 4.5 V).
What is the function of the ORG pin on the 93AA46BT-I/MS?
The ORG pin is not implemented on the 93AA46BT-I/MS - it is a no-connect (NC) terminal, as confirmed in the Pin Function Table and Package Types diagram (DS20001749K, pages 2 and 12). The 'A' suffix indicates fixed 8-bit organization, eliminating the need for external ORG logic. In MSOP packaging, pin 6 is labeled ORG/NC and must be left unconnected or tied to ground per layout guidelines.
How does the Ready/Busy status work on the 93AA46BT-I/MS?
The DO pin doubles as Ready/Busy indicator: during erase or write operations, DO outputs low while programming is active and transitions high upon completion. To read status, CS must be brought high for ≥250 ns after the command (TCSL), then sampled on subsequent CLK edges. After completion, issuing a Start bit followed by CS low clears the status. This behavior is documented in Sections 2.4–2.9 and Figure 2-1 of DS20001749K.
Is the 93AA46BT-I/MS RoHS compliant and lead-free?
Yes, the 93AA46BT-I/MS is RoHS compliant and features a Pb-free Matte Tin (Sn) finish, as explicitly stated in the Features section and Packaging Information (DS20001749K, pages 1 and 13). The MSOP package conforms to JEDEC standards, and the "3e" marking on the top-side silkscreen confirms the matte tin plating per Microchip's packaging specification.
93AA46BT-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:
- 64 x 16
- 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
93AA46BT-I/MS FAQ
1.How can I place an order for 93AA46BT-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46BT-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 93AA46BT-I/MS reliable?
The price and inventory of 93AA46BT-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 93AA46BT-I/MS is usually 5 days.
3.What payment methods are accepted for 93AA46BT-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46BT-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46BT-I/MS?
93AA46BT-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46BT-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 93AA46BT-I/MS?
For technical support, including 93AA46BT-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46BT-I/MS requirements.
6.How does Aetrix verify that 93AA46BT-I/MS is sourced from the original manufacturer or authorized distributors?
All 93AA46BT-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 93AA46BT-I/MS meets industry standards.
7.What is the process for return or replacement of 93AA46BT-I/MS?
All 93AA46BT-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46BT-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 93AA46BT-I/MS part is unused and in its original packaging.
Return procedure for 93AA46BT-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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