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Microchip Technology 93LC46AT-E/OT
- Part No.:
- 93LC46AT-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93LC46AT-E/OT.pdf
- Description:
- IC EEPROM 1KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,753
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Product details
Overview
93LC46AT-E/OT 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 SOT-23-6 package. 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 for configuration storage in engine control units and automotive sensor modules.
For engineers reviewing the 93LC46AT-E/OT datasheet, 93LC46AT-E/OT pinout, 93LC46AT-E/OT application, or 93LC46AT-E/OT equivalent, key selection criteria include VCC range compatibility (2.5–5.5V), automotive-grade reliability, SOT-23-6 footprint constraints, 128 × 8-bit organization (no ORG pin), and support for sequential read and WRAL/ERAL commands in safety-critical firmware storage.
Technical Context
The 93LC46AT-E/OT implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins, requiring no external clock source beyond master-controlled CLK edges. Its internal logic enforces strict timing windows including TCSL ≥ 250 ns, TCKH/TCKL scaling with VCC (e.g., 250 ns min at 2.5V), and TPD ≤ 400 ns at 1.8V–2.5V with 100 pF load.
It operates exclusively in x8 mode (fixed 8-bit word size), eliminating ORG pin dependency - unlike C-variant parts. All erase/write operations are self-timed: TWC = 6 ms for erase/write, TEC = 6 ms for ERAL, and TWL = 15 ms for WRAL, all requiring VCC ≥ 4.5V for full functionality of bulk commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Kbit (128 × 8-bit) - fixed x8 organization; no ORG pin required or functional. |
| VCC Range | 2.5V to 5.5V - supports wide-input automotive power rails; POR threshold at 1.5V ensures data retention during brown-out. |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C/5.0V; enables long-term field calibration storage. |
| Data Retention | 200 years - guaranteed nonvolatile data hold under automotive temperature stress (−40°C to +125°C). |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - no SPI mode; requires master to manage start condition and opcode framing. |
| Timing (TWC) | 6 ms max erase/write cycle - self-timed; eliminates need for external delay timers in host firmware. |
| Package | SOT-23-6 (OT) - 2.9 mm × 1.6 mm footprint; optimized for space-constrained automotive PCBs. |
Pinout & Package
SOT-23-6 package (OT suffix), 2.9 mm × 1.6 mm body, 0.95 mm height, gull-wing leads. Pin 1 marked by laser dot; pin 1 ID located at top-left corner when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DO) | Data Output / Ready-Busy Indicator | Tri-state output; drives high-Z when idle, low during active erase/write, high when ready; also outputs 8-bit read data on rising CLK edges. |
| 2 (VSS) | Ground Reference | Primary return path for all internal logic and I/O; must be connected directly to system ground plane. |
| 3 (DI) | Data Input | Serial input for start bit, opcodes (e.g., 01 for WRITE), addresses (A6–A0), and 8-bit data; sampled on rising CLK edge. |
| 4 (VCC) | Power Supply | 2.5–5.5V supply; internal POR circuit disables writes below 1.5V to prevent corruption during power ramp. |
| 5 (CS) | Chip Select | Active-high enable; must remain high ≥250 ns between instructions (TCSL); falling edge initiates self-timed write after last data bit. |
| 6 (CLK) | Serial Clock | Master-generated clock; rising edge clocks in DI bits and clocks out DO bits; stoppable at any point without state loss. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates host MCU timing overhead: 6 ms max TWC allows deterministic firmware flow without polling delays. |
| Automatic ERAL before WRAL | Ensures clean memory state prior to bulk write - prevents partial overwrite corruption in critical configuration updates. |
| Power-On/Off Data Protection | Hardware-enforced write inhibition below 1.5V VCC - guarantees EEPROM integrity during ignition cycling and battery disconnect. |
| Ready/Busy Status via DO | Enables real-time progress monitoring: DO = low → operation ongoing; DO = high → complete; no additional status register needed. |
| Sequential Read Mode | Reduces command overhead: holding CS high after READ auto-increments address and streams consecutive bytes without reissuing opcodes. |
Applications
| Engine Control Unit (ECU) Trim Storage | Automotive Sensor Calibration Memory |
|---|---|
Use Scenario: Storing fuel injection trim values and adaptive learning parameters that persist across vehicle power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to ECU's microcontroller via Microwire bus; accessed during boot and runtime calibration routines. Use Value: 200-year data retention and 1M endurance ensure parameter integrity over full vehicle lifetime without refresh or backup power. |
Use Scenario: Holding factory-calibrated offset/gain coefficients for wheel speed or pressure sensors in ADAS modules. IC Role / Device Role / Timing Role: Dedicated x8 EEPROM providing deterministic 8-bit read/write access synchronized to sensor MCU clock domain. Use Value: Automotive-grade −40°C to +125°C operation and 2.5V minimum VCC support robustness in under-hood environments with wide voltage transients. |
| Infotainment System Settings Backup | Body Control Module (BCM) Configuration |
Use Scenario: Preserving user preferences (volume, display brightness, language) across ignition cycles in head unit firmware. IC Role / Device Role / Timing Role: Low-power serial EEPROM accessed only during power-up/down sequences; standby current <5 µA minimizes parasitic drain. Use Value: SOT-23-6 footprint enables placement near SoC in dense infotainment PCB layouts without sacrificing signal integrity. |
Use Scenario: Storing door lock logic states, window auto-up/down thresholds, and lighting profiles in BCM firmware. IC Role / Device Role / Timing Role: Microwire EEPROM integrated into BCM's 3.3V domain; supports WRAL for fast factory programming of multiple settings. Use Value: 15 ms WRAL cycle time enables rapid configuration loading during end-of-line testing, reducing production line dwell time. |
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/OT | 1Kbit, 64 × 16-bit organization; same VCC range, package, and temp grade. | Requires 16-bit data path and host firmware adapted for x16 addressing; incompatible with x8-only systems. | Select only if system architecture mandates 16-bit word access and firmware supports dual-byte reads/writes. |
| AT25010B-MAHL-T | SPI interface (4-wire), 1 Kbit (128 × 8), 1.8–5.5V, −40°C to +125°C, SOT-23-6. | Uses SPI protocol instead of Microwire; requires different driver stack and CS/CLK timing handling. | Choose when migrating to SPI-based platforms or consolidating with other SPI peripherals; not drop-in compatible. |
Compared with 93LC46BT-E/OT, the 93LC46AT-E/OT provides native x8 compatibility without address remapping; versus AT25010B-MAHL-T, it retains Microwire legacy support but lacks SPI flexibility - making it optimal for cost-sensitive automotive designs already committed to Microwire infrastructure.
Availability
93LC46AT-E/OT is available at Aetrix Electronics and suitable for automotive electronics, engine control units, and sensor calibration systems requiring stable component supply across extended product lifecycles.
Supply support for 93LC46AT-E/OT 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/B/C series was designed specifically for automotive and industrial applications demanding high-reliability, low-voltage serial EEPROM with Microwire compatibility and extended temperature operation.
FAQ
What is the memory organization of the 93LC46AT-E/OT?
The 93LC46AT-E/OT has a fixed 128 × 8-bit (1Kbit) organization. It belongs to the 'A' variant family and does not feature an ORG pin - unlike 'C' variants - so word size is permanently set to 8 bits. This eliminates external configuration logic and simplifies host interface design for byte-oriented systems.
Does the 93LC46AT-E/OT support SPI communication?
No, the 93LC46AT-E/OT uses a Microwire-compatible 3-wire serial interface (CS, CLK, DI/DO), not SPI. It lacks the dedicated SO/SI pins and mode-select logic required for SPI protocols. Host firmware must implement Microwire-specific start-bit detection, opcode framing (e.g., '01' for WRITE), and status polling via DO pin.
What is the minimum VCC required for reliable operation of the 93LC46AT-E/OT?
The 93LC46AT-E/OT operates reliably from 2.5V to 5.5V. Its power-on reset (POR) circuit activates below 1.5V to inhibit writes, but functional operation - including read, erase, and write - requires VCC ≥ 2.5V. At 2.5V, AC timing parameters scale (e.g., TCKH/TCKL = 450 ns), and ICC write current drops to 2 µA.
Can the 93LC46AT-E/OT be used in place of the 93LC46CT-E/OT?
No - the 93LC46CT-E/OT is a 'C' variant with an ORG pin enabling selectable 8-/16-bit operation, while the 93LC46AT-E/OT is 'A' variant with fixed 8-bit organization and no ORG pin. Pin 6 on the SOT-23-6 package is NC on the 93LC46AT-E/OT but functions as ORG on the 'C' version, making them electrically and functionally incompatible.
What packaging and marking identify the 93LC46AT-E/OT?
The 93LC46AT-E/OT is supplied in SOT-23-6 (OT) package per Microchip's DS20001749K. Marking includes "L46A" on first line, "3L46AT" on second line, temperature code "E", year/week code (e.g., "528"), and traceability "1FNN" - consistent with Microchip's 93LC46A automotive-grade SOT-23-6 identification standard.
93LC46AT-E/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- 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
- 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:
- SOT-23-6
93LC46AT-E/OT FAQ
1.How can I place an order for 93LC46AT-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46AT-E/OT 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 93LC46AT-E/OT reliable?
The price and inventory of 93LC46AT-E/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC46AT-E/OT is usually 5 days.
3.What payment methods are accepted for 93LC46AT-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46AT-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46AT-E/OT?
93LC46AT-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46AT-E/OT 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 93LC46AT-E/OT?
For technical support, including 93LC46AT-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46AT-E/OT requirements.
6.How does Aetrix verify that 93LC46AT-E/OT is sourced from the original manufacturer or authorized distributors?
All 93LC46AT-E/OT 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 93LC46AT-E/OT meets industry standards.
7.What is the process for return or replacement of 93LC46AT-E/OT?
All 93LC46AT-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46AT-E/OT, 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 93LC46AT-E/OT part is unused and in its original packaging.
Return procedure for 93LC46AT-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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