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Microchip Technology 93AA46T/SN
- Part No.:
- 93AA46T/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA46T/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,999
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Product details
Overview
93AA46T/SN from Microchip Technology Inc. is a 1 Kbit (128 × 8 or 64 × 16) low-voltage serial EEPROM with Microwire interface, ORG-pin-selectable memory organization, and 1.8 V to 5.5 V single-supply operation. It delivers 70 µA typical active read current at 1.8 V, 2 µA standby current, and supports industrial temperature range (–40°C to +85°C) in an 8-lead SOIC (SN) package. It is used for nonvolatile parameter storage in embedded sensor nodes and power-constrained industrial controllers.
For engineers reviewing the 93AA46T/SN datasheet, 93AA46T/SN pinout, 93AA46T/SN application, or 93AA46T/SN equivalent, key selection criteria include its 1.8 V minimum operating voltage, self-timed erase/write cycles (4 ms/word), 1 million endurance cycles, 200+ year data retention, and compatibility with legacy Microwire-based microcontroller peripherals.
Technical Context
The 93AA46T/SN implements a synchronous 3-wire Microwire interface (CS, CLK, DI/DO) with start-bit detection and opcode-driven command execution. Its dual-memory organization (x8/x16) is selected via the ORG pin, enabling flexible byte- or word-oriented access without external logic.
Internal self-timed programming eliminates need for external timing control: ERAL (erase all) completes in 8 ms typical, WRAL (write all) in 16 ms typical, and individual WRITE/ERASE operations in 4 ms typical - all ensured at VCC = 5 V ±10%. Ready/Busy status is signaled via DO pin during active cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8 or 64 × 16 bits), configurable via ORG pin |
| Supply voltage | 1.8 V to 5.5 V - enables direct interface with 1.8 V, 3.3 V, and 5 V microcontrollers |
| Endurance | 1,000,000 erase/write cycles - supports frequent firmware parameter updates |
| Data retention | >200 years at 25°C - ensures long-term reliability in unattended systems |
| Operating current | 70 µA typical at 1.8 V (read), 2 µA typical standby - suitable for battery-powered devices |
| Interface | Industry-standard 3-wire Microwire (CS/CLK/DI/DO) - no SPI or I²C conversion required |
| Temperature range | –40°C to +85°C (Industrial grade) - validated for harsh environmental deployment |
Pinout & Package
8-lead SOIC (SN) package per JEDEC MS-012 standard, 150 mil body width, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal logic |
| CLK | Serial Clock | Synchronizes opcode/address/data transfer on rising edge; stoppable at any point |
| DI | Data Input | Accepts start bit, opcode, address, and write data; supports shared DI/DO bus with pull-up |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); high-Z when inactive or CS low |
| VSS | Ground | Reference return path for all digital and analog circuitry |
| ORG | Memory Organization | High = x16 mode (64 words), low = x8 mode (128 bytes); must be fixed for fCLK >1 MHz |
| NU | Not Utilized | No internal connection; left floating or tied to VSS/VCC per layout best practice |
| VCC | Power Supply | Single supply input (1.8–5.5 V); powers internal logic and charge pump for programming |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 1.8 V - eliminates level-shifting in modern ultra-low-power designs |
| Self-timed programming | No external timing components or software delays needed for ERASE/WRITE/ERAL/WRAL |
| Power-on/off protection | Automatic inhibit below 1.4 V - prevents corruption during brown-out or hot-swap events |
| Sequential read mode | Continuous data streaming while CS remains high - reduces instruction overhead for block reads |
| Write-enable security | EWEN/EWDS commands prevent accidental writes - critical for field-updatable calibration data |
Applications
| Smart Metering Modules | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Storing tariff tables, meter calibration coefficients, and event logs in electricity/water/gas meters with limited battery life. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with infrequent writes and long-term data integrity requirements. Use Value: 1.8 V operation extends battery life; 200+ year retention ensures data survival across product lifetime without refresh. | Use Scenario: Retaining module identification, channel configuration, and fault history in DIN-rail mounted I/O expansion units. IC Role / Device Role / Timing Role: Parameter EEPROM interfaced directly to 3.3 V ARM Cortex-M microcontrollers via Microwire. Use Value: Industrial temperature rating (–40°C to +85°C) and 1M endurance support reliable operation in factory-floor environments. |
| Medical Sensor Calibration | Automotive Body Control Units |
Use Scenario: Storing sensor offset/gain values and patient-specific settings in portable diagnostic devices. IC Role / Device Role / Timing Role: Secure, low-power nonvolatile memory for calibration data requiring traceability and revision control. Use Value: EWEN/EWDS lock mechanism prevents unintended overwrites during device servicing or firmware updates. | Use Scenario: Holding door lock actuator profiles, mirror position presets, and lighting configuration in BCM modules. IC Role / Device Role / Timing Role: Microwire-compatible EEPROM for legacy MCU peripherals without dedicated SPI/I²C hardware. Use Value: Pin-compatible replacement for older 93AA46 variants; same SOIC footprint simplifies BOM consolidation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93AA46C/SN | Same pinout and function; updated revision with enhanced ESD (4 kV HBM) and tighter AC timing specs | Recommended for new designs; identical drop-in replacement with improved robustness | Select 93AA46C/SN for new projects requiring full manufacturer support and extended lifecycle assurance |
| AT25010B-MAHL-T | SPI interface (not Microwire), 1.8–5.5 V, 1 Kbit, SOIC-8; requires different driver firmware | Used where SPI is preferred over Microwire; not pin- or protocol-compatible | Choose only if migrating to SPI architecture; requires PCB and firmware redesign |
Compared with 93AA46T/SN, the 93AA46C/SN offers identical functionality with improved ESD tolerance and is actively supported, while the AT25010B-MAHL-T provides SPI compatibility at the cost of interface redesign - neither is pin-compatible with legacy Microwire systems unless explicitly re-engineered.
Availability
93AA46T/SN is available at Aetrix Electronics and suitable for smart metering, industrial PLC I/O modules, medical sensor calibration, and automotive body control units requiring stable component supply and long-term obsolescence management.
Supply support for 93AA46T/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, FPGA, and memory solutions, headquartered in Chandler, Arizona.
The 93AA46T/SN belongs to Microchip's legacy Microwire Serial EEPROM product line, designed specifically for low-power, industrial-grade nonvolatile storage in resource-constrained embedded systems with legacy controller interfaces.
FAQ
What is the memory organization flexibility of the 93AA46T/SN?
The 93AA46T/SN supports two memory configurations via the ORG pin: when tied to VCC, it operates as 64 × 16-bit (x16); when tied to VSS, it operates as 128 × 8-bit (x8). This allows system designers to optimize for word-aligned or byte-aligned access without changing firmware logic - a feature confirmed in DS20067K pages 4–5 and section 3.5. The 93AA46T/SN maintains full functionality in both modes.
Does the 93AA46T/SN require external timing components for erase or write operations?
No. The 93AA46T/SN features fully self-timed erase and write cycles, including auto-erase before write (ERAL before WRAL). All programming operations - individual WRITE, ERASE, ERAL, and WRAL - complete autonomously after the falling edge of CS, with typical durations of 4 ms (per word), 8 ms (ERAL), and 16 ms (WRAL) at 5 V. No external capacitors, clocks, or software delay loops are needed, as verified in DS20067K sections 2.6–2.9.
How does the 93AA46T/SN handle power transitions to prevent data corruption?
The 93AA46T/SN incorporates built-in power-on/power-off data protection: programming modes are inhibited until VCC exceeds 1.4 V during startup, and disabled when VCC falls below 1.4 V during shutdown. Additionally, the device powers up in EWDS (Erase/Write Disable) mode, requiring an explicit EWEN command before any programming - preventing accidental writes during brown-out or reset sequences. These mechanisms are documented in DS20067K sections 2.3 and 2.5.
Can the 93AA46T/SN be used with a shared DI/DO bus line?
Yes, the 93AA46T/SN supports bus-sharing between DI and DO, but caution is required: a "bus conflict" may occur during the dummy zero preceding READ if address bit A0 is high, causing undefined voltage at DO. To avoid this, use a pull-up resistor on the shared line and ensure proper timing alignment. This behavior is explicitly described in DS20067K section 2.2 and Figure 2-2, confirming functional feasibility with appropriate design mitigation.
Is the 93AA46T/SN still recommended for new designs?
No - Microchip explicitly states "Not recommended for new designs" in DS20067K page 1, recommending migration to the 93AA46C/SN variant instead. The 93AA46T/SN remains available for legacy support and existing production, but lacks ongoing roadmap investment. Its datasheet revision history (Revision J/K) confirms discontinuation status, and the 93AA46C/SN offers identical pinout with enhanced ESD and timing specifications.
93AA46T/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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, 64 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93AA46T/SN FAQ
1.How can I place an order for 93AA46T/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46T/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 93AA46T/SN reliable?
The price and inventory of 93AA46T/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA46T/SN is usually 5 days.
3.What payment methods are accepted for 93AA46T/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46T/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46T/SN?
93AA46T/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46T/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 93AA46T/SN?
For technical support, including 93AA46T/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46T/SN requirements.
6.How does Aetrix verify that 93AA46T/SN is sourced from the original manufacturer or authorized distributors?
All 93AA46T/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 93AA46T/SN meets industry standards.
7.What is the process for return or replacement of 93AA46T/SN?
All 93AA46T/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46T/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 93AA46T/SN part is unused and in its original packaging.
Return procedure for 93AA46T/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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