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Microchip Technology 93LC46BT-E/OT
- Part No.:
- 93LC46BT-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93LC46BT-E/OT.pdf
- Description:
- IC EEPROM 1KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,856
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Product details
Overview
93LC46BT-E/OT from Microchip Technology Inc. is a 1 Kbit (128 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 2.5–5.5 V supply range, -40°C to +125°C automotive temperature grade, and SOT-23-6 package. It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status via DO pin - used for configuration storage in engine control units and automotive sensor modules.
For engineers reviewing the 93LC46BT-E/OT datasheet, 93LC46BT-E/OT pinout, 93LC46BT-E/OT application, or 93LC46BT-E/OT equivalent, key selection criteria include its automotive-grade temperature support, SOT-23-6 footprint compatibility, 128 × 8-bit fixed organization (no ORG pin), 1 million erase/write endurance, and 200-year data retention - critical for safety-critical nonvolatile memory in ECU firmware parameter tables and calibration data logging.
Technical Context
The 93LC46BT-E/OT implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins. It operates exclusively in x8 mode (ORG pin not present), requiring no external logic for word-size selection. All instructions - READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS - are initiated by a Start bit followed by opcode and address/data bits clocked on CLK rising edges.
Internal 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, mandating an EWEN command before any programming sequence. Ready/Busy status is polled via DO pin after CS high assertion following TCSL ≥ 250 ns.
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 wide-input automotive power rails including post-regulated 3.3 V and unregulated 5 V domains |
| Temperature Grade | -40°C to +125°C (Automotive E-temp) - qualified for under-hood and transmission control module environments |
| Endurance | 1,000,000 erase/write cycles - enables frequent recalibration updates in adaptive control systems |
| Data Retention | 200 years at +25°C - ensures long-term integrity of vehicle VIN, mileage, and diagnostic history storage |
| 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) - deterministic timing for real-time firmware update sequences without blocking interrupts |
Pinout & Package
SOT-23-6 package (lead-free Matte Tin finish), 2.9 mm × 1.6 mm footprint, 0.95 mm height - optimized for space-constrained automotive PCBs and automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DO) | Data Output / Ready-Busy Status | Tri-state output; low = busy during erase/write, high = ready; also delivers read data on CLK rising edge |
| 2 (VSS) | Ground Reference | Primary return path for all internal logic and I/O; must be low-impedance connection to system GND plane |
| 3 (DI) | Data Input | Serial input for Start bit, opcodes, addresses, and write data; sampled on CLK rising edge |
| 4 (VCC) | Power Supply | 2.5–5.5 V supply; includes internal POR circuitry that disables operation below ~1.5 V |
| 5 (CS) | Chip Select | Active-high enable; falling edge initiates self-timed write cycle after last data bit; minimum TCSL = 250 ns between commands |
| 6 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in DI and clocks out DO; stoppable at any point |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write cycles | Eliminates need for external timing control or polling delays beyond DO status check - simplifies firmware driver implementation |
| Automatic ERAL before WRAL | Guarantees full array erase prior to bulk write, preventing stale data corruption in calibration table updates |
| Power-on/off data protection | Hardware-level inhibition below VPOR threshold prevents partial writes during brown-out or hot-swap events |
| Erase/Write Enable/Disable (EWEN/EWDS) | Prevents accidental overwrites during normal operation; device powers up in locked EWDS state |
| Sequential read function | Enables efficient dump of entire memory contents with single CS assertion - reduces SPI transaction overhead |
Applications
| Engine Control Unit (ECU) Calibration Storage | Advanced Driver Assistance Systems (ADAS) Sensor Configuration |
|---|---|
Use Scenario: Storing fuel map coefficients, ignition timing offsets, and OBD-II diagnostic thresholds subject to field updates via dealership flash tools. IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding runtime-critical parameters accessed at boot and during closed-loop control loops. Use Value: 200-year retention and 1M-cycle endurance ensure calibration data survives vehicle lifetime and repeated reprogramming across service intervals. | Use Scenario: Holding camera lens distortion correction matrices, radar object detection thresholds, and fusion algorithm weights in ADAS domain controllers. IC Role / Device Role / Timing Role: Dedicated x8 serial EEPROM interfaced to ARM Cortex-R5F MCU via dedicated Microwire peripheral for deterministic access. Use Value: Automotive temperature rating (-40°C to +125°C) and SOT-23-6 package allow direct placement near imaging sensors and radar SoCs without thermal derating. |
| Transmission Control Module (TCM) Gear Strategy Tables | Electric Power Steering (EPS) Motor Profile Storage |
Use Scenario: Storing shift-point maps, torque converter lock-up schedules, and adaptive learning values for gear ratio compensation. IC Role / Device Role / Timing Role: Fail-safe nonvolatile memory storing mission-critical drivetrain behavior parameters updated only during dealer diagnostics. Use Value: Hardware write-protection (EWDS default) and voltage-detect circuitry prevent corruption during battery transients common in 12 V automotive electrical systems. | Use Scenario: Maintaining motor phase advance profiles, current limit curves, and road feel tuning constants calibrated per vehicle variant. IC Role / Device Role / Timing Role: Low-pin-count serial EEPROM providing deterministic 6-ms write latency for real-time profile switching during steering maneuvers. Use Value: 6 ms TWC and Ready/Busy polling via DO pin enable precise synchronization with EPS control loop deadlines without CPU overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC46B-I/OT | Industrial temp grade (-40°C to +85°C); same 128×8-bit organization, SOT-23-6 package, and electrical specs | Not qualified for under-hood or transmission tunnel mounting; suitable for cabin electronics or body control modules | Select when automotive E-temp qualification is unnecessary and cost optimization is prioritized |
| AT25010B-MAHL-T | 1 Kbit SPI interface (4-wire), 1.8–5.5 V, industrial temp; no ERAL/WRAL commands; standard SPI protocol stack required | Lacks Microwire-specific features (e.g., automatic ERAL before WRAL); requires different MCU driver layer | Choose when existing SPI infrastructure exists and Microwire legacy compatibility is not required |
Compared with 93LC46B-I/OT, the 93LC46BT-E/OT adds automotive temperature qualification and tighter AEC-Q100-aligned screening; compared with AT25010B-MAHL-T, it retains Microwire compatibility and integrated ERAL/WRAL sequencing but uses a less common interface.
Availability
93LC46BT-E/OT is available at Aetrix Electronics and suitable for automotive engine management, ADAS sensor calibration, and electric power steering systems requiring stable component supply across extended production lifecycles.
Supply support for 93LC46BT-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 93LC46 series belongs to Microchip's legacy Microwire-compatible serial EEPROM product line, designed specifically for automotive, industrial, and consumer applications requiring reliable, low-power nonvolatile storage in compact packages.
FAQ
What is the memory organization of the 93LC46BT-E/OT?
The 93LC46BT-E/OT is a fixed 128 × 8-bit (1 Kbit) device with no ORG pin - it operates exclusively in x8 mode. Unlike 'C' variants, it does not support x16 configuration. This simplifies hardware design by eliminating external ORG pull-up/down resistors and guarantees consistent 8-bit data framing for all READ/WRITE operations.
Does the 93LC46BT-E/OT require an external pull-up resistor on the CS pin?
Yes, Microchip recommends a 10 kΩ external pull-down resistor on the CS pin for added protection against spurious activation during power-up or noise events. This ensures the device remains in Standby mode until intentionally selected, preventing unintended commands or partial writes during system initialization.
What is the maximum clock frequency supported by the 93LC46BT-E/OT?
The 93LC46BT-E/OT supports up to 3 MHz clock frequency when VCC is 4.5 V to 5.5 V, 2 MHz at 2.5 V to 4.5 V, and 1 MHz at 1.8 V to 2.5 V. Since the 93LC46BT-E/OT operates within 2.5–5.5 V, its practical maximum is 3 MHz - enabling fast sequential reads with minimal transaction overhead.
How does the Ready/Busy status work on the 93LC46BT-E/OT DO pin?
The DO pin serves dual function: data output during READ and Ready/Busy indicator during programming. After initiating ERASE, WRITE, ERAL, or WRAL, bring CS high for ≥250 ns (TCSL), then sample DO - low indicates ongoing operation, high means complete. The status is cleared by issuing a Start bit followed by CS low.
Is the 93LC46BT-E/OT RoHS compliant and lead-free?
Yes, the 93LC46BT-E/OT is RoHS compliant and features a Pb-free Matte Tin (Sn) finish per JEDEC standards. The SOT-23-6 package meets J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/60% RH and supporting standard reflow profiles without baking.
93LC46BT-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:
- 64 x 16
- 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
93LC46BT-E/OT FAQ
1.How can I place an order for 93LC46BT-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC46BT-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 93LC46BT-E/OT reliable?
The price and inventory of 93LC46BT-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 93LC46BT-E/OT is usually 5 days.
3.What payment methods are accepted for 93LC46BT-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC46BT-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC46BT-E/OT?
93LC46BT-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC46BT-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 93LC46BT-E/OT?
For technical support, including 93LC46BT-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC46BT-E/OT requirements.
6.How does Aetrix verify that 93LC46BT-E/OT is sourced from the original manufacturer or authorized distributors?
All 93LC46BT-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 93LC46BT-E/OT meets industry standards.
7.What is the process for return or replacement of 93LC46BT-E/OT?
All 93LC46BT-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with 93LC46BT-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 93LC46BT-E/OT part is unused and in its original packaging.
Return procedure for 93LC46BT-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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