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Microchip Technology 93AA46CT-I/SN
- Part No.:
- 93AA46CT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA46CT-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,101
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Product details
Overview
93AA46CT-I/SN from Microchip Technology Inc. is a 1 Kbit low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 128 × 8-bit organization (fixed x8), 1.8–5.5 V supply range, and industrial temperature rating (−40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL/WRAL support, and power-on/off data protection - deployed in microcontroller boot configuration storage and sensor calibration memory.
For engineers reviewing the 93AA46CT-I/SN datasheet, 93AA46CT-I/SN pinout, 93AA46CT-I/SN application, or 93AA46CT-I/SN equivalent, key selection criteria include guaranteed 1M endurance, 200+ year data retention, RoHS-compliant SOIC-8 packaging, and compatibility with legacy Microwire-based host controllers requiring minimal I/O overhead.
Technical Context
The 93AA46CT-I/SN implements a synchronous serial interface using CS, CLK, and DI/DO pins with start-bit detection and opcode-driven command execution. It operates in fixed 8-bit mode (no ORG pin functionality) and supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions with clock-synchronized timing.
Internal logic includes address decoding, data register buffering, and Ready/Busy status reporting via DO pin during erase/write operations. Power-on reset circuitry ensures write inhibition below 1.5 V, and standby current remains ≤5 µA with CS low and CLK/DI at valid logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit organization); no word-size selection - dedicated x8 mode for simplified firmware interface. |
| 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. |
| Endurance | 1,000,000 erase/write cycles; supports frequent field updates in calibration or logging applications. |
| Data retention | Greater than 200 years at 25°C; ensures long-term reliability in unattended embedded systems. |
| Write cycle time | 6 ms typical (TWC); deterministic self-timed programming eliminates need for external timing control. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO); requires only four MCU GPIOs and no additional protocol stack. |
| Operating temp | −40°C to +85°C (Industrial grade); validated across full range for automotive body electronics and industrial controls. |
Pinout & Package
93AA46CT-I/SN is packaged in 8-lead SOIC (SN) with Pb-free Matte Tin finish. Pin 1 is marked by laser dot; package dimensions conform to JEDEC MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; device enters Standby mode when low; minimum 250 ns low time required between commands. |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; stoppable at any point. |
| DI (Pin 3) | Data Input | Receives Start bit, instruction opcodes, address bits, and write data; must be high with CS on first CLK rising edge for Start detection. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or during non-read operations. |
| VSS (Pin 5) | Ground | Reference return path for all signals; must be connected directly to system ground plane. |
| NC (Pin 6) | No internal connection | Unused terminal; left floating or tied to ground per layout best practice - no functional impact. |
| VCC (Pin 8) | Power Supply | Supplies core logic and memory array; bypass capacitor (0.1 µF) required within 10 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - host MCU polls DO pin for completion instead of managing fixed delays. |
| Automatic ERAL before WRAL | Ensures clean memory state prior to bulk write; removes need for separate erase command in firmware initialization. |
| Power-on/off data protection | Hardware lockout below 1.5 V VCC prevents corruption during brown-out or hot-plug events. |
| Ready/Busy status on DO | Enables efficient polling without dedicated status lines - reduces pin count and simplifies PCB routing. |
| RoHS-compliant SOIC-8 | Meets environmental regulations and supports standard reflow profiles; compatible with automated SMT assembly. |
Applications
| Microcontroller Boot Configuration | Sensor Calibration Storage |
|---|---|
Use Scenario: Storing bootloader parameters, factory-set trim values, and secure boot flags for PIC® and dsPIC® MCUs. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up reset sequence via Microwire interface. Use Value: Enables field-upgradable firmware behavior without modifying MCU code - critical for certified medical and industrial devices. | Use Scenario: Retaining temperature-compensated offset/gain coefficients for analog sensors in HVAC and automotive cabin modules. IC Role / Device Role / Timing Role: Persistent calibration memory updated during end-of-line test and read at system startup. Use Value: Maintains measurement accuracy over 200+ years without recalibration - reduces service cost and warranty liability. |
| Smart Meter Parameter Storage | Industrial PLC I/O Mapping |
Use Scenario: Saving tariff schedules, demand-response thresholds, and metering constants in ANSI C12.19-compliant electricity meters. IC Role / Device Role / Timing Role: Secure parameter store accessed by metrology ASIC during initialization and firmware updates. Use Value: Guarantees 1M write cycles for lifetime utility firmware upgrades - exceeds ANSI 12.22 requirements for 10-year field life. | Use Scenario: Holding digital I/O assignment tables and module identification codes in modular programmable logic controllers. IC Role / Device Role / Timing Role: Configuration EEPROM mapped into controller's peripheral address space via SPI-to-Microwire bridge. Use Value: Allows hot-swap reconfiguration of I/O modules without firmware reload - improves uptime in continuous-process plants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46AT-I/SN | Same 128×8 organization but 2.5–5.5 V VCC range; lacks 1.8 V operation. | Not suitable for battery-powered 1.8 V systems; otherwise identical instruction set and timing. | Select if system VCC never drops below 2.5 V and legacy 93LC compatibility is required. |
| AT25010B-MAHL-T | 1 Kbit SPI EEPROM (4-wire); 1.8–5.5 V; 5 MHz max clock; no ERAL/WRAL built-in. | Requires software-managed erase-before-write; no auto-ERAL - increases firmware complexity. | Choose for SPI-native designs where pin count allows extra CS line and deterministic 5 ms writes suffice. |
Compared with 93LC46AT-I/SN, the 93AA46CT-I/SN adds 1.8 V operation for ultra-low-power systems; compared with AT25010B-MAHL-T, it delivers hardware-accelerated bulk erase/write and simpler 3-wire control - reducing MCU resource load in resource-constrained controllers.
Availability
93AA46CT-I/SN is available at Aetrix Electronics and suitable for microcontroller configuration, sensor calibration, smart metering, and industrial PLC applications requiring stable component supply across extended product lifecycles.
Supply support for 93AA46CT-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 93AAxx series was designed specifically for low-voltage, low-pin-count serial EEPROM applications in cost-sensitive and space-constrained embedded systems - emphasizing Microwire compatibility, robust data integrity, and extended endurance.
FAQ
What is the memory organization of the 93AA46CT-I/SN?
The 93AA46CT-I/SN has a fixed 128 × 8-bit (x8) organization. Unlike 'C' variants with an ORG pin, this part is an 'A' version - meaning the ORG pin is not implemented (marked NC), and it operates exclusively in 8-bit mode. This simplifies firmware development by eliminating configuration dependency on external logic levels.
Does the 93AA46CT-I/SN support 1.8 V operation?
Yes, the 93AA46CT-I/SN supports a VCC range of 1.8 V to 5.5 V, making it fully compatible with modern ultra-low-power microcontrollers and battery-operated systems. Its power-on reset threshold is 1.5 V, ensuring reliable write inhibition during brown-out conditions common in 1.8 V rail environments.
How does the Ready/Busy status work on the 93AA46CT-I/SN?
The DO pin of the 93AA46CT-I/SN outputs Ready/Busy status during erase or write operations: DO = low indicates active programming, DO = high means complete. Status is only valid after CS is brought high for ≥250 ns post-command - and DO returns to High-Z when CS is low or during non-programming states.
What is the purpose of the NC pin on the 93AA46CT-I/SN?
Pin 6 on the 93AA46CT-I/SN is labeled NC (No Connection) because it corresponds to the ORG pin location used only on 'C' variants. As an 'A' version device, 93AA46CT-I/SN has no ORG functionality - so this pin is internally unconnected and may be left floating or tied to ground per board-level noise mitigation practices.
Can the 93AA46CT-I/SN be used as a drop-in replacement for the 93C46A?
No - the 93AA46CT-I/SN is not a drop-in replacement for the 93C46A. While both are 1 Kbit serial EEPROMs, the 93C46A requires 4.5–5.5 V operation and uses different timing (2 ms write cycle), whereas the 93AA46CT-I/SN operates down to 1.8 V and uses 6 ms write timing. Firmware and power supply must be verified for compatibility.
93AA46CT-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:
- 128 x 8, 64 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 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
93AA46CT-I/SN FAQ
1.How can I place an order for 93AA46CT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA46CT-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 93AA46CT-I/SN reliable?
The price and inventory of 93AA46CT-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 93AA46CT-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA46CT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA46CT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA46CT-I/SN?
93AA46CT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA46CT-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 93AA46CT-I/SN?
For technical support, including 93AA46CT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA46CT-I/SN requirements.
6.How does Aetrix verify that 93AA46CT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA46CT-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 93AA46CT-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA46CT-I/SN?
All 93AA46CT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA46CT-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 93AA46CT-I/SN part is unused and in its original packaging.
Return procedure for 93AA46CT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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