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Microchip Technology 93AA46BT-I/SN
- Part No.:
- 93AA46BT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA46BT-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,917
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Product details
Overview
93AA46BT-I/SN from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5 V supply range, and industrial temperature rating (−40°C to +85°C). It features self-timed erase/write cycles, automatic erase-all-before-write-all, power-on/off data protection, and Ready/Busy status signaling via DO pin - used in embedded system configuration storage, sensor calibration memory, and firmware parameter retention.
For engineers reviewing the 93AA46BT-I/SN datasheet, 93AA46BT-I/SN pinout, 93AA46BT-I/SN application, or 93AA46BT-I/SN equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), SOIC-8 package, 1 million erase/write endurance, >200-year data retention, and compatibility with microcontroller SPI-like serial masters requiring nonvolatile memory with hardware write protection.
Technical Context
The 93AA46BT-I/SN implements a synchronous serial Microwire protocol with CS, CLK, and DI/DO lines. It operates exclusively in x8 mode (128 × 8-bit), eliminating ORG pin dependency - unlike C-variant parts. All instructions (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS) are clocked on rising CLK edges, with DO providing either data output or Ready/Busy status depending on CS timing and operation phase.
Its internal architecture includes an address decoder, data register, mode decode logic, and output buffer, supporting sequential read and auto-erase-before-write. Power-on reset circuitry ensures write inhibition below 1.5 V, and EWEN/EWDS commands enforce explicit enable/disable of programming functions - critical for robust field operation in industrial control and automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 words × 8 bits) - fixed x8 organization; no ORG pin required or functional. |
| Supply voltage | 1.8 V to 5.5 V - supports wide-range battery-powered and mixed-voltage MCU systems. |
| Endurance | 1,000,000 erase/write cycles - enables frequent runtime parameter updates in telemetry or calibration applications. |
| Data retention | Greater than 200 years at 25°C - ensures long-term reliability without refresh in unattended equipment. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - software-bitbangable on most MCUs; no MISO/MOSI separation needed. |
| Access time | Max 400 ns DO delay (TPD) at 1.8 V - meets timing requirements for 2 MHz clock operation in low-power modes. |
| Write cycle time | 6 ms typical (TWC) - defines minimum interval between successive WRITE/ERAL/WRAL commands. |
Pinout & Package
93AA46BT-I/SN is supplied in an 8-lead SOIC package (SN suffix), with standard 150-mil body width and Pb-free Matte Tin finish. Pin 1 is marked by laser dot or notch; pin 1 ID is at top-left corner when viewed top-side with marking oriented left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge (for AA/LC variants). |
| CLK (Pin 2) | Serial Clock | Rising-edge synchronized I/O; clock high/low times scale with VCC (e.g., 450 ns min at 1.8 V); stoppable mid-transfer. |
| DI (Pin 3) | Data Input | Accepts Start bit, opcode, address, and write data; tied to VSS or VCC during standby per datasheet recommendations. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; requires CS high ≥250 ns to sample status. |
| VSS (Pin 5) | Ground | Reference for all I/O and internal logic; must be connected before VCC during power-up. |
| NC (Pin 6) | No Connect | Internally unconnected; must be left floating or tied to VSS - not used for ORG (A/B variants only). |
| NC (Pin 7) | No Connect | Unused terminal; no internal connection; avoid routing signals to this pin. |
| VCC (Pin 8) | Power Supply | 1.8–5.5 V input; includes on-chip POR detection at ~1.5 V; powers internal charge pump for write operations. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - internal state machine manages auto-erase and programming, reducing MCU firmware overhead. |
| Automatic ERAL before WRAL | Ensures full array readiness before bulk write; prevents partial writes due to residual data - critical for configuration recovery sequences. |
| Power-on/off data protection | Hardware lockout below 1.5 V VCC prevents corruption during brown-out or hot-plug events without software intervention. |
| Ready/Busy status on DO | Enables polling-based write completion detection - avoids fixed delays and improves system responsiveness in real-time tasks. |
| EWEN/EWDS command security | Requires explicit enable before any write/erase; disables after each operation unless re-enabled - prevents accidental overwrites in interrupt-driven code. |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed at boot and during field recalibration; x8 interface matches 8-bit MCU GPIO constraints. Use Value: 1M endurance allows daily recalibration over 27 years; >200-year retention eliminates need for backup batteries or supercaps. | Use Scenario: Holding user-defined settings (network IP, display brightness, alarm thresholds) in HVAC control panels. IC Role / Device Role / Timing Role: Serial configuration memory interfaced to 8-bit PIC® MCU via bit-banged Microwire; CS/CLK/DI/DO shared with other peripherals. Use Value: 1.8 V operation enables direct connection to low-power MCU I/O; EWEN/EWDS prevents menu navigation from triggering unintended writes. |
| Firmware Parameter Backup | Automotive Subsystem Logging |
Use Scenario: Saving last-known operational state (motor position, valve status, error flags) before MCU reset or power loss in motor drives. IC Role / Device Role / Timing Role: Fast-access nonvolatile scratchpad; 6 ms write time fits within safe shutdown window of <10 ms. Use Value: Self-timed write relieves MCU from managing precise timing; Ready/Busy polling avoids blocking interrupts during save. | Use Scenario: Recording diagnostic codes and mileage counters in dashboard modules operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-temp-rated EEPROM interfaced to CAN-connected microcontroller; SOIC-8 simplifies PCB layout in space-constrained clusters. Use Value: RoHS-compliant Pb-free finish meets automotive ELV directive; 1.8 V support enables use with 2.5 V or 3.3 V domain MCUs. |
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/SN | Same 128×8 organization and SOIC-8 package, but 2.5–5.5 V VCC range - lacks 1.8 V capability. | Not suitable for 1.8 V battery-powered designs; otherwise pin- and function-compatible. | Select if system VCC ≥2.5 V and legacy 93LC family qualification is required. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128×8), 1.8–5.5 V, 20 MHz max clock - no Ready/Busy pin; uses Write Enable (WREN) instead of EWEN. | Requires separate WREN command before write; no DO-based status polling - relies on software timeout or WIP flag read. | Choose for SPI-native systems where higher throughput justifies added command overhead and loss of hardware status feedback. |
Compared with 93LC46BT-I/SN, the 93AA46BT-I/SN offers broader voltage support down to 1.8 V and identical pinout, while the AT25010B-MAHL-T provides faster SPI access but removes hardware-ready signaling - impacting deterministic write completion handling in safety-critical contexts.
Availability
93AA46BT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and firmware parameter backup requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 93AA46BT-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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93AAxx series is part of Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded applications requiring reliable nonvolatile storage with minimal pin count and simple firmware integration.
FAQ
What is the memory organization of the 93AA46BT-I/SN?
The 93AA46BT-I/SN is a fixed 128 × 8-bit (1 Kbit) device with no ORG pin - it operates exclusively in x8 mode. Unlike C-variant parts, it does not support x16 configuration. This simplifies design by removing external ORG pull-up/pull-down requirements and guarantees consistent 8-bit data framing for all READ/WRITE operations.
Does the 93AA46BT-I/SN require an external pull-up resistor on the DO line?
No, the 93AA46BT-I/SN does not require an external pull-up on DO. The DO pin actively drives high/low during READ and Ready/Busy status reporting, and enters High-Z when deselected (CS low) or idle. However, if DI and DO are shorted (shared bus), a current-limiting resistor is recommended to prevent bus conflict during dummy-zero read phases.
What is the minimum VCC required for reliable write operation of the 93AA46BT-I/SN?
The 93AA46BT-I/SN requires VCC ≥1.8 V for specification-compliant operation, but write functionality is guaranteed only above the POR threshold of ~1.5 V. For robust erase/write cycles, Microchip specifies 1.8 V as the minimum operating voltage - operation below this level may result in incomplete programming or data corruption.
Can the 93AA46BT-I/SN be used with a 3.3 V microcontroller without level shifting?
Yes, the 93AA46BT-I/SN is fully compatible with 3.3 V microcontrollers. Its VIH1 (2.0 V min) and VIL1 (0.8 V max) thresholds at VCC = 3.3 V ensure reliable logic recognition, and VOH1 (2.4 V min) and VOL1 (0.4 V max) meet standard 3.3 V CMOS drive requirements - enabling direct connection to GPIO pins without level translation.
How is write protection implemented in the 93AA46BT-I/SN?
Write protection in the 93AA46BT-I/SN is implemented via dual hardware/software mechanisms: (1) power-on reset inhibits writes below ~1.5 V VCC, and (2) the Erase/Write Enable (EWEN) instruction must be issued before any ERASE, WRITE, ERAL, or WRAL command. After each write, executing EWDS disables further programming until the next EWEN - preventing accidental overwrites during normal operation.
93AA46BT-I/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:
- 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
93AA46BT-I/SN FAQ
1.How can I place an order for 93AA46BT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46BT-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 93AA46BT-I/SN reliable?
The price and inventory of 93AA46BT-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 93AA46BT-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA46BT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46BT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46BT-I/SN?
93AA46BT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46BT-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 93AA46BT-I/SN?
For technical support, including 93AA46BT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46BT-I/SN requirements.
6.How does Aetrix verify that 93AA46BT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA46BT-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 93AA46BT-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA46BT-I/SN?
All 93AA46BT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46BT-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 93AA46BT-I/SN part is unused and in its original packaging.
Return procedure for 93AA46BT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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