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Microchip Technology 93LC46AXT/SN
- Part No.:
- 93LC46AXT/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46AXT/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,890
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Product details
Overview
93LC46AXT/SN from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, and industrial temperature grade (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used in embedded system configuration storage and calibration data retention.
For engineers reviewing the 93LC46AXT/SN datasheet, 93LC46AXT/SN pinout, 93LC46AXT/SN application, or 93LC46AXT/SN equivalent, key selection considerations include its dedicated 8-bit organization (no ORG pin), SOIC-8 package (SN), 1 million erase/write endurance, >200-year data retention, and compatibility with microcontroller SPI-like serial interfaces requiring minimal GPIO resources.
Technical Context
The 93LC46AXT/SN implements a synchronous serial Microwire protocol with CS, CLK, and DI/DO pins - no ORG pin required, fixed 128 × 8-bit memory map. Communication begins with a Start bit (CS high + DI high on CLK rising edge), followed by opcode, 7-bit address, and 8-bit data for WRITE or READ operations.
It uses internal auto-erase-before-write logic and supports ERAL (Erase All) and WRAL (Write All) commands with device-level status polling via DO pin. Power-on reset circuitry holds writes disabled until explicit EWEN command, and VCC brown-out detection (VPOR = 1.5 V typical) prevents corruption during power transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 words × 8 bits) - fixed x8 organization, no ORG pin dependency |
| VCC range | 2.5 V to 5.5 V - supports wide-range industrial MCU I/O rails without level shifting |
| Endurance | 1,000,000 erase/write cycles - enables frequent field calibration updates |
| Data retention | >200 years at 25°C - ensures long-term reliability in unpowered storage |
| Write cycle time | 6 ms max (TWC) - deterministic timing for firmware-controlled write sequencing |
| Interface | Microwire 3-wire serial (CS/CLK/DI/DO) - compatible with SPI master mode using software bit-banging |
| Temp range | –40°C to +85°C (Industrial) - validated for operation in harsh ambient environments |
Pinout & Package
93LC46AXT/SN is packaged in 8-lead SOIC (SN), with lead finish Pb-free Matte Tin. Pin 1 is CS; pin 2 is CLK; pin 3 is DI; pin 4 is DO; pin 5 is VSS; pin 6 is NC (no internal connection); pin 7 is NC; pin 8 is VCC. ORG pin is not present - consistent with 'A' variant designation.
| 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 |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers on rising edge; clock may pause mid-sequence without state loss |
| DI (Pin 3) | Data Input | Accepts Start bit, opcodes (e.g., 01 for WRITE), 7-bit address, and 8-bit data; no bus conflict risk in x8 mode |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or after status polling |
| VSS (Pin 5) | Ground | Reference for all I/O and internal logic; must be connected before VCC during power-up |
| NC (Pin 6 & 7) | No Connection | Internally unconnected; may be left floating or tied to ground per board layout requirements |
| VCC (Pin 8) | Power Supply | Supplies core logic and memory array; brown-out detection activates below ~1.5 V to block writes |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - firmware only needs to poll DO for completion |
| Automatic ERAL before WRAL | Guarantees clean memory state before bulk write, preventing partial-data corruption |
| Power-on/off data protection | Hardware-enforced write inhibition during VCC ramp-up/down avoids inadvertent writes |
| Ready/Busy status on DO | Enables non-blocking polling - frees MCU resources during write latency without timers or interrupts |
| 128 × 8-bit fixed organization | Simplifies address decoding and buffer management in 8-bit microcontroller systems |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in HVAC controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed at boot and updated during field recalibration routines. Use Value: Enables accurate sensor output over temperature and lifetime without external battery-backed RAM. | Use Scenario: Holding user-selected UI language, display brightness, and network settings in medical diagnostic equipment. IC Role / Device Role / Timing Role: Persistent configuration register bank accessed via MCU GPIO-driven Microwire interface. Use Value: Survives power cycles and retains settings across firmware updates and service interventions. |
| Automotive Subsystem Identity | IoT Edge Device Profile Storage |
Use Scenario: Recording unique CAN node ID and firmware revision for ECU modules in body control units. IC Role / Device Role / Timing Role: One-time programmable identity store initialized during manufacturing test. Use Value: Provides traceability and secure identification without requiring flash partitioning or complex security keys. | Use Scenario: Caching Wi-Fi SSID/password and TLS root CA certificates in battery-powered smart meters. IC Role / Device Role / Timing Role: Low-power persistent memory accessed infrequently but requiring guaranteed write integrity. Use Value: Achieves <1 µA standby current and 1M-cycle endurance - critical for 10+ year battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46BXT/SN | 128 × 16-bit organization; same VCC/temp range; requires 16-bit data path handling | Used where MCU has native 16-bit I/O or higher density per access is prioritized | Select only if system architecture supports 16-bit word reads/writes and address space efficiency outweighs 8-bit simplicity |
| AT25010B-SSHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V, same endurance and retention | Requires dedicated SPI peripheral or additional GPIO for CS; no Ready/Busy pin - relies on fixed timing or software delay | Choose when existing design already uses SPI peripherals and DO status polling is not required for real-time responsiveness |
Compared with 93LC46BXT/SN, the 93LC46AXT/SN simplifies firmware by eliminating 16-bit alignment logic; compared with AT25010B-SSHL-T, it provides hardware-ready status feedback and tighter timing control for deterministic write completion detection.
Availability
93LC46AXT/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive subsystem identity storage requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC46AXT/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 93LC46A series belongs to Microchip's legacy Microwire-compatible serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable nonvolatile storage with minimal MCU resource usage.
FAQ
What is the memory organization of the 93LC46AXT/SN?
The 93LC46AXT/SN implements a fixed 128 × 8-bit (1 Kbit) organization. As an 'A' variant, it does not include an ORG pin and is permanently configured for 8-bit word access - no external logic or voltage level is needed to select word size. This simplifies PCB layout and firmware development versus 'C' variants requiring ORG pin control.
Does the 93LC46AXT/SN require an external pull-up resistor on the DO pin?
No, the 93LC46AXT/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 CS is low or after status polling. However, a 10 kΩ pull-down on CS is recommended per Microchip application guidance to prevent spurious activation during power-up.
What is the minimum VCC required for reliable operation of the 93LC46AXT/SN?
The 93LC46AXT/SN incorporates a built-in voltage detect circuit with VPOR = 1.5 V (typical). Below this threshold, all write operations are hardware-disabled to prevent data corruption. Reliable read and write functionality requires VCC ≥2.5 V, as specified in the DC characteristics table for Industrial temperature range operation.
Can the 93LC46AXT/SN be used with a standard SPI interface?
The 93LC46AXT/SN uses Microwire protocol - a subset of SPI with 3-wire (CS/CLK/DI/DO) half-duplex operation. It is compatible with most SPI masters when configured for Mode 0 (CPOL = 0, CPHA = 0) and software-managed DO sampling. No MISO/MOSI separation is needed, but clock polarity and phase must match Microwire timing requirements per DS20001749K.
How is write protection implemented on the 93LC46AXT/SN?
Write protection on the 93LC46AXT/SN is implemented through dual mechanisms: (1) hardware brown-out detection disables writes below ~1.5 V, and (2) Erase/Write Enable (EWEN) command must be issued before any ERASE or WRITE instruction. The device powers up in EWDS (Erase/Write Disable) state, requiring explicit EWEN to unlock programming - preventing accidental writes during initialization or noise events.
93LC46AXT/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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC46AXT/SN FAQ
1.How can I place an order for 93LC46AXT/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46AXT/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 93LC46AXT/SN reliable?
The price and inventory of 93LC46AXT/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46AXT/SN is usually 5 days.
3.What payment methods are accepted for 93LC46AXT/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46AXT/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46AXT/SN?
93LC46AXT/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46AXT/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 93LC46AXT/SN?
For technical support, including 93LC46AXT/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46AXT/SN requirements.
6.How does Aetrix verify that 93LC46AXT/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46AXT/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 93LC46AXT/SN meets industry standards.
7.What is the process for return or replacement of 93LC46AXT/SN?
All 93LC46AXT/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46AXT/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 93LC46AXT/SN part is unused and in its original packaging.
Return procedure for 93LC46AXT/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46AXT/SN Tags
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