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Microchip Technology 93AA46B-I/MS
- Part No.:
- 93AA46B-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93AA46B-I/MS.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,877
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Product details
Overview
93AA46B-I/MS from Microchip Technology Inc. is a 1Kbit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, Ready/Busy status via DO pin, and RoHS-compliant MSOP-8 packaging - used for configuration storage in embedded microcontroller systems.
For engineers reviewing the 93AA46B-I/MS datasheet, 93AA46B-I/MS pinout, 93AA46B-I/MS application, or 93AA46B-I/MS equivalent, key selection considerations include its fixed 16-bit word organization (no ORG pin), 6 ms typical write cycle time, 1 million endurance cycles, 200+ year data retention, and compatibility with low-power MCU peripherals requiring serial nonvolatile memory.
Technical Context
This device implements a synchronous serial Microwire protocol with CS/CLK/DI/DO signaling, supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions. Its internal architecture includes an address decoder, mode decode logic, clock register, and output buffer - all optimized for deterministic timing under varying VCC (1.8–5.5V) and temperature (–40°C to +85°C).
Unlike 'C' variants, the 93AA46B has no ORG pin and operates exclusively in 16-bit mode; it requires no external configuration logic. Power-on data protection is enforced by a 1.5V VCC detect threshold, and all programming operations require prior EWEN command execution - ensuring robust immunity against spurious writes during brown-out or reset conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (64 words × 16 bits) - provides compact nonvolatile storage for calibration data, device IDs, or firmware flags in space-constrained designs. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - simplifies MCU GPIO usage and eliminates need for I²C pull-ups or SPI SS management overhead. |
| VCC Range | 1.8 V to 5.5 V - supports direct interfacing with 1.8V, 3.3V, and 5V logic domains without level shifters. |
| Write Cycle Time | 6 ms typical (TWC) - enables predictable timing budgeting for firmware update routines and avoids indefinite blocking during EEPROM commits. |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in applications requiring frequent parameter updates (e.g., energy meter tariff logs). |
| Data Retention | 200+ years at 25°C - guarantees persistent storage integrity across product lifecycles without refresh mechanisms. |
| Operating Temp | –40°C to +85°C (Industrial grade) - validated for deployment in automotive body control modules, industrial sensors, and outdoor IoT edge nodes. |
Pinout & Package
8-pin MSOP package (150 mil width), Pb-free Matte Tin finish, exposed pad optional (not electrically connected per datasheet Note 1). Pin 1 marked by laser dot; pin 1 ID corner confirmed per Microchip DS20001749K-page 18.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CS (Chip Select) | Active-high enable; must be held low ≥250 ns between commands; initiates self-timed write on falling edge for 93AA46B. |
| 2 | CLK (Serial Clock) | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence without state corruption. |
| 3 | DI (Data In) | Accepts Start bit, instruction opcodes, addresses, and write data; high-impedance when not selected. |
| 4 | DO (Data Out) | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge; requires TCSL ≥250 ns before status polling. |
| 5 | VSS | Ground reference for all I/O and internal circuitry; must be low-impedance connection to avoid timing violations. |
| 6 | NC | No internal connection - left unconnected; not bonded or tied internally (confirmed for A/B variants). |
| 7 | VCC | Power supply input; voltage detect threshold of 1.5 V prevents operation below safe margin; decoupling capacitor required. |
| 8 | ORG | No internal connection on 93AA46B - permanently disabled; device fixed to 16-bit organization per Device Selection Table. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or software delays - firmware only waits for DO high or polls status after TCSL. |
| Automatic ERAL before WRAL | Ensures full array readiness before bulk write; removes requirement for separate ERAL command in configuration initialization sequences. |
| Power-On/Off Data Protection | Hardware-enforced lockout below 1.5 V VCC - prevents partial writes or corruption during power ramp-up/down or brown-out events. |
| Ready/Busy Status via DO | Enables non-blocking polling or interrupt-driven completion detection - reduces CPU idle time versus fixed-delay write routines. |
| Sequential Read Function | Allows continuous address increment with single CS assertion - cuts transaction overhead by ~40% vs. individual reads for multi-byte blocks. |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Backup |
|---|---|
Use Scenario: Storing calibrated sensor offsets and gain coefficients that persist across power cycles in electricity/water meters. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during boot and field recalibration; interfaces directly with 3.3V ARM Cortex-M MCU via GPIO-banged Microwire. Use Value: 1M endurance supports daily recalibration over 27 years; 200-year retention eliminates need for battery-backed SRAM or periodic flash refresh. |
Use Scenario: Holding user-defined I/O mapping, PID loop parameters, and alarm thresholds in modular programmable logic controllers. IC Role / Device Role / Timing Role: Serial configuration store updated via HMI or Modbus RTU; accessed during cold start and runtime parameter changes. Use Value: 6 ms write time enables sub-10ms parameter commit; 1.8–5.5V operation allows direct use with 2.5V FPGA configuration banks or 5V legacy backplanes. |
| Automotive Body Control Module | Medical Device Usage Log |
Use Scenario: Recording door lock actuation counts, mirror position presets, and lighting profiles in vehicle BCMs. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced to 1.8V CAN microcontroller; retains settings during ignition-off periods. Use Value: Industrial temp rating (–40°C to +85°C) meets AEC-Q100 ambient requirements; RoHS compliance satisfies automotive material restrictions. |
Use Scenario: Logging sterilization cycles, operator IDs, and fault events in portable diagnostic equipment with regulatory traceability needs. IC Role / Device Role / Timing Role: Tamper-resistant audit trail storage; accessed only during maintenance mode to prevent runtime interference. Use Value: EWEN/EWDS command protection prevents accidental overwrite; 1M endurance accommodates >270 years of daily logging at 10 entries/day. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46B-I/MS | Same 64×16-bit organization and MSOP-8 package, but wider VCC range starts at 2.5V (vs. 1.8V for 93AA46B); no 1.8V operation support. | Not suitable for 1.8V-only systems (e.g., ultra-low-power wearables); otherwise functionally identical in timing and instruction set. | Select 93LC46B-I/MS only if system VCC never drops below 2.5V and higher ESD tolerance (≥4 kV) is required. |
| AT25010B-MAHL-T | SPI interface (4-wire), 128×8-bit organization, 1.8–5.5V, 5 ms max write time; lacks ERAL/WRAL and EWEN/EWDS security commands. | Requires dedicated SPI peripheral and additional GPIO for CS; no hardware erase-all or write-enable lockout - increases firmware complexity for secure updates. | Choose AT25010B-MAHL-T only when migrating to SPI-based platforms or when needing faster 5 ms writes and higher 10 MHz clock support. |
Compared with 93LC46B-I/MS and AT25010B-MAHL-T, the 93AA46B-I/MS uniquely supports true 1.8V operation with integrated data protection (EWEN/EWDS) and atomic ERAL/WRAL - making it optimal for cost-sensitive, low-voltage embedded systems requiring robust configuration storage.
Availability
93AA46B-I/MS is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration backup, and automotive body control module design requiring stable component supply and long-term lifecycle assurance.
Supply support for 93AA46B-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93AA46B belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for low-power, cost-sensitive embedded systems requiring reliable, pin-efficient nonvolatile memory with minimal external components.
FAQ
What is the memory organization of the 93AA46B-I/MS?
The 93AA46B-I/MS has a fixed 64-word × 16-bit organization (1 Kbit total), with no ORG pin - unlike 'C' variants. This means it always operates in 16-bit mode, accepting 6-bit addresses and 16-bit data words during READ and WRITE operations, as defined in Table 1-3 of the datasheet.
Does the 93AA46B-I/MS require an external pull-up resistor on the DO line?
No - the 93AA46B-I/MS drives DO actively during READ and Ready/Busy status reporting. However, if DI and DO are shorted (shared bus), a current-limiting resistor (e.g., 10 kΩ) is recommended between them to prevent bus conflict when A0 is high, as noted in Section 2.2 of the datasheet.
What is the minimum VCC required for reliable operation of the 93AA46B-I/MS?
The 93AA46B-I/MS incorporates a built-in voltage detector that inhibits all operations below approximately 1.5 V (VPOR parameter, D11 in Table 1-1). This ensures data integrity during power-up, brown-out, or shutdown - no external reset supervisor is needed for basic protection.
How does the 93AA46B-I/MS handle write protection?
The 93AA46B-I/MS powers up in Erase/Write Disable (EWDS) mode. An EWEN command must precede any ERASE or WRITE instruction, and an EWDS command should follow each write to re-lock the array. This two-step hardware-enforced protocol prevents accidental overwrites during noise or reset events.
Can the 93AA46B-I/MS be used in place of the 93AA46A-I/MS?
No - the 93AA46B-I/MS is not a drop-in replacement for the 93AA46A-I/MS. They differ in memory organization (64×16-bit vs. 128×8-bit), instruction timing (18 vs. 18/25 clock cycles for READ/WRITE), and data width handling. Firmware must be modified to match the 16-bit addressing and data format of the 93AA46B-I/MS.
93AA46B-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not 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
93AA46B-I/MS FAQ
1.How can I place an order for 93AA46B-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46B-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 93AA46B-I/MS reliable?
The price and inventory of 93AA46B-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 93AA46B-I/MS is usually 5 days.
3.What payment methods are accepted for 93AA46B-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46B-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46B-I/MS?
93AA46B-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46B-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 93AA46B-I/MS?
For technical support, including 93AA46B-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46B-I/MS requirements.
6.How does Aetrix verify that 93AA46B-I/MS is sourced from the original manufacturer or authorized distributors?
All 93AA46B-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 93AA46B-I/MS meets industry standards.
7.What is the process for return or replacement of 93AA46B-I/MS?
All 93AA46B-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46B-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 93AA46B-I/MS part is unused and in its original packaging.
Return procedure for 93AA46B-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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