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Microchip Technology 93LC46AX-I/SN
- Part No.:
- 93LC46AX-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46AX-I/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,428
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Product details
Overview
93LC46AX-I/SN from Microchip Technology Inc. is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating over 2.5–5.5 V, rated for Industrial temperature (−40°C to +85°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 signaling via DO pin - used for configuration storage in microcontroller-based embedded systems.
For engineers reviewing the 93LC46AX-I/SN datasheet, 93LC46AX-I/SN pinout, 93LC46AX-I/SN application, or 93LC46AX-I/SN equivalent, key selection criteria include its dedicated 8-bit organization (no ORG pin), 1 million erase/write endurance, 200-year data retention, low standby current (1 µA), and compatibility with legacy Microwire controllers requiring deterministic timing and hardware-level write protection.
Technical Context
This device implements a synchronous serial interface with CS, CLK, and DI/DO pins, using rising-edge clocking for instruction, address, and data transfer. Its internal logic includes mode decode, address counter, and output buffer, enabling sequential read, auto-erase-before-write, and ERAL/WRAL commands without external timing control.
Power-on reset and voltage detect circuitry (VPOR = 1.5 V typical) inhibit all operations below VCC threshold. The device powers up in EWDS (Erase/Write Disable) state, requiring explicit EWEN before any programming - ensuring robust immunity against spurious writes during power ramp or noise events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit organization; fixed x8, no ORG pin) |
| VCC range | 2.5 V to 5.5 V - supports mixed-voltage systems including 3.3 V and 5 V microcontrollers |
| Endurance | 1,000,000 erase/write cycles - enables frequent calibration or logging updates in field-deployed devices |
| Data retention | 200 years at 25°C - guarantees long-term firmware parameter persistence without refresh |
| Write cycle time | 6 ms typical (TWC) - deterministic self-timed programming eliminates need for software delay loops |
| Standby current | 1 µA at I-temp - critical for battery-powered applications where quiescent power must be minimized |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® MCU peripherals and simple GPIO bit-banging |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free Matte Tin finish, 3.9 mm × 4.9 mm body, 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; minimum 250 ns low time (TCSL) required between instructions; controls Standby entry/exit |
| 2 CLK | Serial Clock | Rising-edge synchronized timing for opcode/address/data; clock can pause mid-transfer without state loss |
| 3 DI | Data Input | Accepts Start bit, 4-bit opcode, 7-bit address, and 8-bit data; high-impedance when not selected |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; requires TCSL ≥250 ns before status polling |
| 5 VSS | Ground | Reference for all digital and analog circuitry; must be low-impedance connection to minimize noise coupling |
| 6 NC | No internal connection | Not bonded; must be left floating or tied to VSS per layout best practice - no functional role |
| 7 ORG | Organization select | Not applicable - 93LC46AX-I/SN is 'A' variant; ORG pin is NC and unused (fixed 8-bit mode) |
| 8 VCC | Power supply | Supplies core logic and memory array; includes internal POR detection at ~1.5 V to block operations during brown-out |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing components and software wait states - reduces BOM count and firmware complexity |
| Automatic ERAL before WRAL | Ensures full-array write integrity without separate erase command - simplifies firmware update routines |
| Power-on/off data protection | Hardware-enforced write inhibition below VPOR threshold - prevents corruption during power transitions |
| Ready/Busy status on DO | Enables non-blocking polling instead of fixed delays - improves system responsiveness and real-time predictability |
| EWEN/EWDS security protocol | Requires explicit enable before each write/erase - blocks accidental writes due to noise or software faults |
Applications
| Industrial Sensor Calibration Storage | Consumer Appliance Configuration Memory |
|---|---|
|
Use Scenario: Storing factory-calibrated sensor offsets and gain coefficients in HVAC temperature sensors. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed once at boot by MCU; supports infrequent updates during maintenance. Use Value: 1M endurance and 200-year retention ensure calibration remains valid across product lifetime without periodic refresh. |
Use Scenario: Retaining user-selected settings (e.g., timer duration, temperature setpoint) in microwave ovens after power loss. IC Role / Device Role / Timing Role: Serial configuration store interfaced directly to 8-bit MCU GPIO; accessed only on menu navigation or power-up. Use Value: 1 µA standby current extends battery backup life; 2.5–5.5 V operation matches appliance main rail or coin-cell backup domain. |
| Medical Device Parameter Backup | Automotive Body Control Module NVM |
|
Use Scenario: Preserving therapy parameters and usage logs in portable infusion pumps compliant with IEC 62304. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory holding audit-trail data; accessed via verified driver stack with CRC validation. Use Value: Hardware write-protection (EWDS default) and voltage-detect lockout prevent corruption during brown-out - supporting Class B safety requirements. |
Use Scenario: Storing door lock configuration, mirror position presets, and lighting profiles in automotive BCMs. IC Role / Device Role / Timing Role: Low-power serial EEPROM sharing bus with other Microwire peripherals; operates across −40°C to +85°C ambient. Use Value: Industrial temp rating and RoHS compliance meet AEC-Q100 indirect requirements; SOIC package supports automated reflow assembly. |
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 | 16-bit organization (64 × 16), same VCC/temp/package - requires ORG = VCC or dedicated 16-bit controller interface | Used where wider data path reduces transaction count (e.g., storing 16-bit ADC calibration tables) | Select only if system architecture supports x16 transfers; not drop-in compatible with x8 firmware |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5 V, 20 MHz max clock - lacks ERAL/WRAL and hardware EWDS/EWEN | Preferred in SPI-native designs needing higher throughput; requires software-managed write protection | Choose when migrating from Microwire to SPI ecosystem; verify timing and protection logic changes in firmware |
Compared with 93LC46BT-I/SN, the 93LC46AX-I/SN provides guaranteed x8 compatibility and simpler timing; versus AT25010B-MAHL-T, it offers stronger hardware-level write security and deterministic 6 ms write latency - critical for safety-critical or resource-constrained MCU platforms.
Availability
93LC46AX-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and medical device parameter backup requiring stable component supply across extended production lifecycles.
Supply support for 93LC46AX-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, and Flash-IP solutions, headquartered in Chandler, Arizona, serving industrial, automotive, and consumer markets since 1989.
The 93LC46A series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring simple, reliable, and long-life nonvolatile storage without complex protocol stacks.
FAQ
What is the memory organization of the 93LC46AX-I/SN?
The 93LC46AX-I/SN is a fixed 128 × 8-bit (1 Kbit) organization device. As an 'A' variant, it does not use the ORG pin - the memory is permanently configured for 8-bit word access. This eliminates external configuration logic and ensures deterministic addressing behavior across all operating conditions.
Does the 93LC46AX-I/SN require an external pull-up resistor on the DO pin?
No, the 93LC46AX-I/SN does not require an external pull-up on DO. The pin actively drives high/low during Read and Ready/Busy status reporting, and enters High-Z when deselected or during non-read operations. A pull-up may cause contention; Microchip recommends direct connection to MCU input or open-drain interface only if shared with DI.
How is write protection implemented in the 93LC46AX-I/SN?
Write protection in the 93LC46AX-I/SN is enforced by hardware: the device powers up in EWDS (Erase/Write Disable) mode, and all erase/write operations require an explicit EWEN (Erase/Write Enable) instruction first. After programming, issuing EWDS restores protection - preventing accidental writes from noise or software errors.
What is the maximum clock frequency supported by the 93LC46AX-I/SN at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93LC46AX-I/SN supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1, FCLK). This applies to all instructions including READ, WRITE, ERASE, and WRAL - ensuring timing margins remain valid across temperature and voltage corners.
Can the 93LC46AX-I/SN be used in automotive applications?
The 93LC46AX-I/SN is rated for Industrial temperature (−40°C to +85°C), not Automotive (−40°C to +125°C). For automotive use, Microchip specifies the 93LC46A-E/SN variant - identical functionality but qualified to E-temp grade with extended reliability testing. Using the 'I' version in under-hood environments risks parametric shift or premature failure.
93LC46AX-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC46AX-I/SN FAQ
1.How can I place an order for 93LC46AX-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46AX-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 93LC46AX-I/SN reliable?
The price and inventory of 93LC46AX-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 93LC46AX-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC46AX-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46AX-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46AX-I/SN?
93LC46AX-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46AX-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 93LC46AX-I/SN?
For technical support, including 93LC46AX-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46AX-I/SN requirements.
6.How does Aetrix verify that 93LC46AX-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46AX-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 93LC46AX-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC46AX-I/SN?
All 93LC46AX-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46AX-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 93LC46AX-I/SN part is unused and in its original packaging.
Return procedure for 93LC46AX-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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