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Microchip Technology 93AA46B-I/SN
- Part No.:
- 93AA46B-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA46B-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:900
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Product details
Overview
93AA46B-I/SN from Microchip Technology Inc. is a 1K-bit (64 × 16-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 1.8V to 5.5V, supporting Industrial temperature range (–40°C to +85°C), and featuring self-timed erase/write cycles, automatic ERAL/WRAL, and Ready/Busy status signaling - used for nonvolatile parameter storage in microcontroller-based embedded systems.
For engineers reviewing the 93AA46B-I/SN datasheet, 93AA46B-I/SN pinout, 93AA46B-I/SN application, or 93AA46B-I/SN equivalent, key selection criteria include guaranteed 1M erase/write cycles, >200-year data retention, VCC-dependent clock frequency up to 3 MHz, integrated power-on/off protection, and compatibility with 8-pin SOIC (SN) packaging for board-level integration.
Technical Context
This device implements a synchronous serial Microwire interface with dedicated CS, CLK, DI, and DO pins - no ORG pin (fixed 16-bit organization). Communication requires a Start bit followed by opcode, address (6-bit), and 16-bit data for WRITE/READ, with all operations synchronized to rising CLK edges.
It features hardware-level data protection: automatic entry into EWDS mode at power-up, requiring explicit EWEN before any erase/write; VCC brown-out detection (1.5V threshold); and internal auto-erase prior to write. Programming cycles are fully self-timed (6 ms typical TWC), with DO providing real-time Ready/Busy status when polled after minimum TCSL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (64 × 16-bit organization - fixed, no ORG pin) |
| VCC Range | 1.8V to 5.5V - supports single-supply operation across battery-powered and 3.3V/5V logic systems |
| Clock Frequency | Up to 3 MHz at VCC ≥ 4.5V - enables fast configuration writes without external timing constraints |
| Erase/Write Cycle Time | 6 ms typical (TWC) - deterministic self-timed programming eliminates need for software delay loops |
| Endurance & Retention | 1,000,000 erase/write cycles; >200 years data retention - suitable for long-life industrial firmware storage |
| Interface Protocol | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage, no I²C pull-ups or UART overhead |
| Temperature Range | Industrial: –40°C to +85°C - qualified for use in automotive body control modules and industrial PLCs |
Pinout & Package
Package: 8-lead SOIC (SN), RoHS-compliant matte tin finish, 150-mil width. Pin 1 marked by laser dot; pin 1 ID corner matches standard JEDEC SOIC orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable - must be held high for ≥250 ns between instructions; deselects device into standby (≤1 µA ICCS) |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers on rising edge; stoppable at any point; no clock required during self-timed write |
| 3 (DI) | Data Input | Accepts Start bit, opcodes (e.g., 01 for WRITE), 6-bit address, and 16-bit data - latched on rising CLK |
| 4 (DO) | Data Output / Status | Outputs 16-bit read data or Ready/Busy (low = busy) - enters High-Z when CS goes low |
| 5 (VSS) | Ground | Reference return path for all signals and internal circuitry - must be low-impedance connection |
| 6 (NC) | No Connect | Internally unconnected - must be left floating or tied to VSS per layout best practice; not ORG (A/B variant) |
| 7 (NC) | No Connect | Internally unconnected - unused pin; no electrical function |
| 8 (VCC) | Power Supply | 1.8–5.5V supply input - includes internal POR circuitry triggering at ~1.5V; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control - 6 ms typical cycle completes autonomously after CS fall |
| Automatic ERAL before WRAL | WRAL instruction internally executes full array erase before write - no separate ERAL command needed |
| Ready/Busy via DO pin | Enables polling-based flow control - avoids fixed delays and improves system responsiveness |
| Power-On/Off Data Protection | VCC brown-out detection disables writes below 1.5V - prevents corruption during power ramp-up/down |
| EWEN/EWDS Security Lock | Explicit Erase/Write Enable required after power-up - prevents accidental overwrites during noise events |
Applications
| Smart Meter Calibration Storage | Industrial Sensor Configuration |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients, tariff tables, and firmware revision metadata in utility-grade electricity meters. IC Role / Device Role / Timing Role: Nonvolatile parameter register holding factory-trimmed values accessed at boot and updated during field recalibration. Use Value: 1M endurance ensures >10 years of daily updates; >200-year retention guarantees accuracy across product lifetime without backup battery. |
Use Scenario: Saving sensor offset/gain settings, linearization curves, and operational thresholds in programmable industrial transmitters. IC Role / Device Role / Timing Role: Standalone configuration memory interfaced directly to MCU SPI/Microwire peripheral - no external level-shifting needed. Use Value: 1.8V operation enables direct connection to ultra-low-power sensor MCUs; 3 MHz clock supports rapid reconfiguration during commissioning. |
| Automotive Body Control Module | Medical Device Usage Logs |
Use Scenario: Recording seat position presets, mirror angles, and lighting profiles in automotive BCMs for user personalization. IC Role / Device Role / Timing Role: Dedicated EEPROM for persistent user preference storage - isolated from main MCU flash to avoid wear leveling conflicts. Use Value: Industrial temp rating (–40°C to +85°C) meets AEC-Q200 ambient requirements; SOIC package supports automated PCB assembly. |
Use Scenario: Logging calibration timestamps, operator IDs, and diagnostic event counters in Class II medical infusion pumps. IC Role / Device Role / Timing Role: Tamper-resistant audit trail memory - write-protected via EWDS after initial setup and verified via checksum reads. Use Value: Built-in power-fail protection prevents log corruption during unexpected shutdown; RoHS compliance satisfies IEC 60601-1 material restrictions. |
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/SN | Same 64×16-bit organization, but 2.5–5.5V VCC range - lacks 1.8V support | Not suitable for 1.8V-only systems; otherwise pin- and function-compatible | Select when system VCC ≥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, 20 MHz max clock | Requires additional CS line and different command set; no Ready/Busy pin - relies on WIP flag polling | Choose for higher-speed SPI systems where protocol flexibility outweighs Microwire simplicity |
Compared with 93LC46B-I/SN, the 93AA46B-I/SN extends low-voltage operation down to 1.8V while retaining identical pinout and instruction set; versus AT25010B-MAHL-T, it offers simpler 3-wire control and hardware Ready/Busy signaling at the cost of lower maximum clock rate and fixed 16-bit word width.
Availability
93AA46B-I/SN is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial sensor configuration, and automotive body control module designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA46B-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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93AA46B-I/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for low-power, cost-sensitive embedded systems requiring reliable nonvolatile storage with minimal pin count and simple firmware integration.
FAQ
What is the memory organization of the 93AA46B-I/SN?
The 93AA46B-I/SN has a fixed 64 × 16-bit organization - meaning it stores 64 words of 16 bits each (1 Kbit total). Unlike 'C' variants, it does not have an ORG pin; the 16-bit width is hardwired. This is confirmed in the Device Selection Table and Pin Function Table of DS20001749K, where 93AA46B is explicitly listed as "16-bit" with "No" under ORG Pin.
Does the 93AA46B-I/SN support 1.8V operation?
Yes, the 93AA46B-I/SN supports a VCC range of 1.8V to 5.5V, as specified in the Device Selection Table and Electrical Characteristics section of DS20001749K. This makes it compatible with modern ultra-low-power microcontrollers and battery-operated devices where 1.8V is the primary supply rail.
How is data protection implemented in the 93AA46B-I/SN?
The 93AA46B-I/SN implements multiple data protection layers: (1) Power-on/off protection that inhibits all operations below ~1.5V VCC; (2) Erase/Write Disable (EWDS) mode at power-up, requiring explicit EWEN before programming; (3) Automatic entry into EWDS after each write. These mechanisms prevent accidental writes during power transitions or noise events.
What is the maximum clock frequency supported by the 93AA46B-I/SN?
The 93AA46B-I/SN supports up to 3 MHz clock frequency when VCC is 4.5V to 5.5V, as stated in Table 1-2 (AC Characteristics) of DS20001749K. At lower voltages (e.g., 1.8V ≤ VCC < 2.5V), the maximum clock drops to 1 MHz to ensure timing margin compliance.
Is the 93AA46B-I/SN pin-compatible with other 93XX46 variants in SOIC packaging?
Yes - the 93AA46B-I/SN uses the same 8-lead SOIC (SN) package footprint and pinout as other 93XX46A/B/C variants in SN packaging, including identical CS/CLK/DI/DO/VSS/VCC assignments. Pins 6 and 7 are NC on all A/B variants, ensuring mechanical and layout compatibility across the family.
93AA46B-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:
- 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-SOIC
93AA46B-I/SN FAQ
1.How can I place an order for 93AA46B-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46B-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 93AA46B-I/SN reliable?
The price and inventory of 93AA46B-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 93AA46B-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA46B-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46B-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46B-I/SN?
93AA46B-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46B-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 93AA46B-I/SN?
For technical support, including 93AA46B-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46B-I/SN requirements.
6.How does Aetrix verify that 93AA46B-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA46B-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 93AA46B-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA46B-I/SN?
All 93AA46B-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46B-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 93AA46B-I/SN part is unused and in its original packaging.
Return procedure for 93AA46B-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA46B-I/SN Tags
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AT24C02C-XHM-T
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