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Microchip Technology 93LC46AX-E/SN
- Part No.:
- 93LC46AX-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC46AX-E/SN.pdf
- Description:
- IC EEPROM 1KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,045
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Product details
Overview
93LC46AX-E/SN from Microchip Technology is a 1Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, industrial/automotive temperature support (−40°C to +125°C), and 1 million erase/write cycles. It serves as nonvolatile configuration storage in microcontroller-based systems requiring reliable parameter retention across power cycles.
For engineers reviewing the 93LC46AX-E/SN datasheet, 93LC46AX-E/SN pinout, 93LC46AX-E/SN application, or 93LC46AX-E/SN equivalent, key selection factors include its dedicated 8-bit organization (no ORG pin), automotive-grade qualification, SOIC-8 package, Ready/Busy status signaling, and self-timed erase/write with automatic ERAL before WRAL.
Technical Context
The 93LC46AX-E/SN implements a synchronous serial Microwire interface with CS, CLK, DI, and DO pins - no ORG pin required due to fixed 8-bit organization. It uses CMOS EEPROM technology with on-chip charge pump for internal programming voltage generation.
Operation requires an EWEN command to enable erase/write; it powers up in EWDS (write-disabled) state. Data integrity is enforced via power-on/off protection, VCC voltage detection (1.5 V threshold), and hardware-level write inhibit below valid supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit) - fixed x8 organization, no ORG pin needed |
| VCC range | 2.5 V to 5.5 V - supports wide supply rails including 3.3 V and 5 V systems |
| Endurance | 1,000,000 erase/write cycles - enables long-term field calibration and logging |
| Data retention | 200 years at 25°C - ensures firmware/config persistence over product lifetime |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage, no SPI mode select overhead |
| Temp range | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and industrial control environments |
| Write time | 6 ms typical per byte - deterministic timing for real-time system response during config updates |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free Matte Tin finish, body size 3.9 mm × 4.9 mm, standard JEDEC MS-012AA footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge |
| 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 (e.g., 01 for WRITE), addresses, and data; high-impedance when not selected |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS fall; requires CS high ≥250 ns to sample status |
| 5 VSS | Ground | Reference for all I/O and internal logic; must be connected before VCC |
| 6 NC | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 NC | No Connect | Internally unconnected; same handling as Pin 6 |
| 8 VCC | Power Supply | 2.5–5.5 V supply; includes on-chip POR circuit triggering at ~1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control; 6 ms typical cycle completes autonomously after CS fall |
| Automatic ERAL before WRAL | Ensures full array readiness before bulk write - no separate erase command required |
| Ready/Busy status on DO | Enables polling-based flow control without interrupt lines or additional GPIO |
| Power-on/off data protection | Hardware lockout below 1.5 V VCC prevents corruption during brown-out or power ramp |
| EWEN/EWDS security | Explicit write-enable protocol prevents accidental writes; defaults to disabled at power-up |
Applications
| Motor Control Configuration | Industrial Sensor Calibration |
|---|---|
Use Scenario: Storing motor commutation tables, PID coefficients, and fault thresholds in BLDC driver modules. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime re-tuning. Use Value: Enables field-updatable motor profiles without firmware reflashing; survives 125°C ambient and repeated power cycling. | Use Scenario: Retaining factory-calibrated offset/gain values and linearization coefficients for pressure/temperature sensors. IC Role / Device Role / Timing Role: Persistent parameter store read at system initialization and updated only during calibration routines. Use Value: Maintains sensor accuracy over 200-year data retention; immune to power loss during calibration sequences. |
| Automotive Body Controller NVM | Medical Device Settings Storage |
Use Scenario: Saving user preferences (window position, mirror angle, lighting modes) in automotive door modules. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced directly to 8-bit MCU GPIOs with minimal board space. Use Value: Qualified to AEC-Q100 Grade 1 (−40°C to +125°C); withstands automotive load dump and cold crank conditions. | Use Scenario: Holding regulatory-compliant device settings (alarm thresholds, dose limits, language selection) in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory with write-disable default and voltage-monitored access. Use Value: Meets IEC 62304 software safety requirements via hardware-enforced write protection and 1M-cycle endurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46BT-E/SN | 16-bit organization (64 × 16), same VCC/temp/package - requires ORG pin tie (not present on A-version) | Optimized for 16-bit MCU data paths; incompatible with 8-bit address/data framing | Select only if system uses 16-bit word-aligned storage and can route ORG (not applicable to 93LC46AX-E/SN footprint) |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit x8, 1.8–5.5 V, −40°C to +125°C, SOIC-8 - different protocol stack and command set | Requires SPI master peripheral instead of generic GPIO bit-banging; no Ready/Busy pin | Choose when existing design already uses SPI peripherals and does not require status polling |
Compared with 93LC46BT-E/SN, the 93LC46AX-E/SN avoids ORG pin routing complexity and matches 8-bit microcontroller data bus alignment. Against AT25010B-MAHL-T, it offers hardware-ready/busy signaling and simpler 3-wire timing but requires Microwire-specific firmware drivers.
Availability
93LC46AX-E/SN is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and medical device configuration storage requiring stable component supply across extended product lifecycles.
Supply support for 93LC46AX-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 devices, and memory solutions, headquartered in Chandler, Arizona.
The 93LC46A/B/C series was designed specifically for cost-sensitive, low-power embedded systems needing robust serial EEPROM with automotive-grade reliability and Microwire compatibility.
FAQ
What is the memory organization of the 93LC46AX-E/SN?
The 93LC46AX-E/SN has a fixed 128 × 8-bit (1Kbit) organization with no ORG pin - unlike C-versions, it does not support x16 mode. This simplifies PCB layout by eliminating ORG routing and ensures deterministic 8-bit data framing compatible with most 8-bit MCUs. The 'A' suffix explicitly denotes this dedicated x8 configuration.
Does the 93LC46AX-E/SN require an external pull-up resistor on the DO pin?
No, the 93LC46AX-E/SN does not require an external pull-up on DO. The DO pin actively drives high/low during read or Ready/Busy status reporting and enters High-Z when deselected or idle. A pull-up may cause bus contention if DI and DO are shorted; Microchip recommends a series resistor if shared-line topology is used, but standalone DO operation needs no external bias.
How is write protection implemented on the 93LC46AX-E/SN?
Write protection on the 93LC46AX-E/SN is implemented via hardware-enforced Erase/Write Disable (EWDS) mode at power-up. An explicit EWEN command must precede any ERASE or WRITE instruction. After each write, issuing EWDS restores protection. Additionally, the device inhibits all programming when VCC drops below ~1.5 V, preventing corruption during brown-out conditions.
Can the 93LC46AX-E/SN be used with a 3.3 V microcontroller GPIO interface?
Yes, the 93LC46AX-E/SN is fully compatible with 3.3 V microcontrollers. Its VCC range (2.5–5.5 V) includes 3.3 V nominal operation, and its input thresholds (VIH = 0.7×VCC, VIL = 0.2×VCC) ensure reliable logic recognition. At 3.3 V, VIH min is 2.31 V and VIL max is 0.66 V - well within standard 3.3 V CMOS output swing, enabling direct connection without level shifters.
What is the maximum clock frequency supported by the 93LC46AX-E/SN at 2.5 V VCC?
At VCC = 2.5 V, the 93LC46AX-E/SN supports a maximum clock frequency of 2 MHz. This is specified in Table 1-2 (A1) of the datasheet. Timing parameters such as TCKH (clock high time) and TCKL (clock low time) scale accordingly - e.g., TCKH min is 250 ns and TCKL min is 200 ns at this voltage, enforcing strict setup/hold margins for reliable bit transfer.
93LC46AX-E/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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC46AX-E/SN FAQ
1.How can I place an order for 93LC46AX-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46AX-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 93LC46AX-E/SN reliable?
The price and inventory of 93LC46AX-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 93LC46AX-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC46AX-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46AX-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46AX-E/SN?
93LC46AX-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46AX-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 93LC46AX-E/SN?
For technical support, including 93LC46AX-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46AX-E/SN requirements.
6.How does Aetrix verify that 93LC46AX-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC46AX-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 93LC46AX-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC46AX-E/SN?
All 93LC46AX-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46AX-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 93LC46AX-E/SN part is unused and in its original packaging.
Return procedure for 93LC46AX-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC46AX-E/SN Tags
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M24C02-WMN6TP
STMicroelectronics
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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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AT24C08C-STUM-T
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