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Microchip Technology 93LC46AXT-E/SN
- Part No.:
- 93LC46AXT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46AXT-E/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,508
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Product details
Overview
93LC46AXT-E/SN from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5V to 5.5V, rated for automotive temperature range (−40°C to +125°C), and housed in an 8-lead SOIC package (SN). It features self-timed erase/write cycles, automatic ERAL/WRAL support, and Ready/Busy status via DO pin - used for configuration storage in engine control units, infotainment boot loaders, and sensor calibration data retention.
For engineers reviewing the 93LC46AXT-E/SN datasheet, 93LC46AXT-E/SN pinout, 93LC46AXT-E/SN application, or 93LC46AXT-E/SN equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), automotive-grade temperature support, 8-bit fixed-word organization (no ORG pin), 1M endurance cycles, and SOIC-8 packaging for legacy PCB integration.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins, supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions. Its internal architecture includes an address decoder, mode decode logic, and output buffer, with power-on data protection triggered at VCC ≥ 1.5V (93LC variant).
It operates exclusively in x8 mode (no ORG pin), requiring 18 clock cycles for READ/WRITE operations and delivering data on DO with ≤400 ns delay (at 1.8V). Write cycle time is 6 ms (TWC), and it supports sequential read while CS remains high - enabling efficient firmware parameter streaming in microcontroller-based systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit); fixed x8 organization - no ORG pin required, simplifying host interface design. |
| VCC Range | 2.5V to 5.5V; supports wide supply rails including 3.3V and 5V systems without level-shifting. |
| Endurance | 1,000,000 erase/write cycles; ensures long-term reliability in field-updatable automotive modules. |
| Data Retention | 200 years at +85°C; validated for lifetime data integrity in under-hood applications. |
| Temperature Grade | Automotive (E): −40°C to +125°C; qualified per AEC-Q100 stress test requirements. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO); minimal GPIO usage, compatible with legacy MCU peripherals. |
| Write Cycle Time | 6 ms typical (TWC); enables deterministic timing for real-time configuration updates. |
Pinout & Package
8-lead SOIC package (SN suffix), Pb-free Matte Tin finish, 150 mil body width, standard pinout compatible with industry SOIC-8 footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between commands; deselects device into standby (ICC ≤ 5 µA). |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence. |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; tied to DO only with series resistor to avoid bus conflict. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS goes low. |
| 5 (VSS) | Ground | Reference return path; decoupling capacitor required near VCC/VSS pins for noise immunity. |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS - no functional role. |
| 7 (ORG) | Organization Select | Not bonded in 93LC46A devices; marked NC in datasheet - unused and must be left unconnected. |
| 8 (VCC) | Power Supply | 2.5–5.5V operation; internal POR circuit triggers at VCC ≥ 1.5V; requires local 0.1 µF ceramic bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing control - host only waits for DO status or uses fixed 6 ms timeout. |
| Automatic ERAL before WRAL | Ensures full-array write success without separate erase command - reduces firmware complexity. |
| Power-On/Off Data Protection | Hardware lockout below 1.5V VCC prevents corruption during brown-out or hot-swap events. |
| Ready/Busy Status on DO | Enables polling-based programming flow without dedicated interrupt lines or timers. |
| Sequential Read Mode | Allows continuous 128-byte read with single CS assertion - optimal for loading calibration tables. |
Applications
| Engine Control Unit (ECU) | Automotive Infotainment System |
|---|---|
Use Scenario: Storing adaptive fuel trim values, fault code history, and VIN-specific calibration parameters that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to ECU's 8-bit MCU via Microwire peripheral. Use Value: Automotive-grade temperature rating and 200-year data retention ensure parameter integrity over vehicle lifetime. |
Use Scenario: Holding boot loader configuration, display brightness profiles, and audio equalizer presets in head unit mainboard. IC Role / Device Role / Timing Role: Serial configuration store accessed during power-up initialization sequence. Use Value: 6 ms write time and 1M endurance support frequent user preference updates without wear-out risk. |
| Industrial Sensor Module | Telematics Control Unit (TCU) |
Use Scenario: Retaining factory-calibrated offset/gain coefficients and sensor linearization tables in pressure/temperature transducers. IC Role / Device Role / Timing Role: Calibration data repository read once at startup and cached in RAM. Use Value: Fixed 8-bit organization simplifies MCU driver development and avoids ORG pin routing complexity. |
Use Scenario: Storing IMEI, SIM lock status, OTA update flags, and cellular module firmware version metadata. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile storage isolated from main application processor. Use Value: EWEN/EWDS instruction set provides software-controlled write protection against accidental overwrite. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46BXT-E/SN | 16-bit organization (64 × 16); requires ORG pin connection (not present on A-version); different instruction timing (25 CLK cycles). | Used where host MCU natively supports 16-bit serial transfers; incompatible with 8-bit-only Microwire controllers. | Select only if system architecture mandates 16-bit word access and ORG pin is available. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5V, industrial temp (−40°C to +85°C); no automotive qualification. | Lacks AEC-Q100 compliance and 125°C operation; suitable for cost-sensitive non-automotive designs. | Choose for SPI-based platforms needing broader VCC range but not requiring automotive qualification. |
Compared with 93LC46AXT-E/SN, the 93LC46BXT-E/SN demands hardware rework for 16-bit alignment and timing changes, while the AT25010B-MAHL-T trades automotive reliability for SPI compatibility and wider voltage flexibility - making the 93LC46AXT-E/SN optimal for drop-in replacement in existing Microwire-based automotive designs.
Availability
93LC46AXT-E/SN is available at Aetrix Electronics and suitable for automotive control modules, infotainment systems, and telematics units requiring stable component supply with full lifecycle traceability and AEC-Q100-compliant sourcing.
Supply support for 93LC46AXT-E/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 93LC46A series belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for cost-effective, low-power nonvolatile storage in automotive and industrial systems requiring simple 3-wire serial interfaces.
FAQ
What is the memory organization of the 93LC46AXT-E/SN?
The 93LC46AXT-E/SN has a fixed 128 × 8-bit (1Kbit) organization with no ORG pin - unlike C-versions, it does not support x16 mode. This eliminates external configuration logic and simplifies PCB layout. The device is fully compatible with standard Microwire 8-bit read/write protocols as defined in the DS20001749K datasheet.
Does the 93LC46AXT-E/SN support automotive temperature range?
Yes, the 93LC46AXT-E/SN is rated for the automotive temperature range (−40°C to +125°C), indicated by the "E" suffix in its part number. It meets AEC-Q100 stress testing requirements for reliability in under-hood and cabin applications, with validated performance across its full VCC range (2.5V–5.5V) at max temperature.
Is the ORG pin functional on the 93LC46AXT-E/SN?
No - the ORG pin is not bonded and functions as NC (No Connect) on the 93LC46AXT-E/SN. As confirmed in the Pin Function Table and Package Types diagram (DS20001749K-page 2), ORG is marked "NC" for A/B devices. It must remain unconnected; tying it to VCC or VSS has no effect and may risk unintended behavior.
What is the maximum clock frequency supported by the 93LC46AXT-E/SN?
The 93LC46AXT-E/SN supports up to 3 MHz clock frequency when VCC is 4.5V–5.5V, 2 MHz at 2.5V–4.5V, and 1 MHz at 1.8V–2.5V (though 1.8V operation is not applicable to this 2.5V-min device). These AC specifications are defined in Table 1-2 of DS20001749K and verified across the automotive temperature range.
How is write protection implemented on the 93LC46AXT-E/SN?
Write protection is enforced via EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) instructions. The 93LC46AXT-E/SN powers up in EWDS mode - all erase/write operations are blocked until EWEN is issued. After each write, executing EWDS restores protection. This dual-instruction scheme prevents accidental overwrites during power transitions or firmware glitches.
93LC46AXT-E/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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC46AXT-E/SN FAQ
1.How can I place an order for 93LC46AXT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46AXT-E/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-E/SN reliable?
The price and inventory of 93LC46AXT-E/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-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC46AXT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46AXT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46AXT-E/SN?
93LC46AXT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46AXT-E/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-E/SN?
For technical support, including 93LC46AXT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46AXT-E/SN requirements.
6.How does Aetrix verify that 93LC46AXT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46AXT-E/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-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC46AXT-E/SN?
All 93LC46AXT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46AXT-E/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-E/SN part is unused and in its original packaging.
Return procedure for 93LC46AXT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46AXT-E/SN Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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