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Microchip Technology 93LC66BT-E/OT
- Part No.:
- 93LC66BT-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93LC66BT-E/OT.pdf
- Description:
- IC EEPROM 4KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,034
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Product details
Overview
93LC66BT-E/OT from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 256 × 16-bit organization, operating across 2.5–5.5 V, supporting Industrial and Automotive temperature ranges (−40°C to +125°C), and featuring Microwire-compatible 3-wire serial interface for embedded system configuration storage.
For engineers reviewing the 93LC66BT-E/OT datasheet, 93LC66BT-E/OT pinout, 93LC66BT-E/OT application, or 93LC66BT-E/OT equivalent, key selection criteria include its 16-bit word width, automotive-grade reliability, SOT-23-6 package footprint, self-timed erase/write cycles, and Ready/Busy status signaling via DO pin.
Technical Context
The 93LC66BT-E/OT implements a synchronous Microwire-compatible serial interface with CS, CLK, DI, and DO signals, requiring no external timing components. Its memory array is organized as 256 words × 16 bits, fixed by device variant ('B' suffix), eliminating ORG pin dependency.
It supports full-cycle operations including READ (20 clock cycles), WRITE (20 clocks), ERASE (12 clocks), ERAL (12 clocks), and WRAL (20 clocks), all initiated by CS falling edge (for 93LC variants) and monitored via DO pin's Ready/Busy state during active programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (256 × 16-bit organization) |
| VCC Range | 2.5 V to 5.5 V - supports wide-input industrial and automotive power rails |
| Temperature Range | −40°C to +125°C - qualified for automotive underhood and engine-control applications |
| Write Cycle Time | 6 ms max - enables deterministic firmware update latency in real-time systems |
| Endurance | 1,000,000 erase/write cycles - ensures long-term field reliability in configuration logging |
| Data Retention | 200 years at +25°C - guarantees nonvolatile storage integrity over product lifetime |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage on microcontrollers |
Pinout & Package
Package: SOT-23-6 (OT), Pb-free Matte Tin finish, 1.6 mm × 2.8 mm footprint, suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DO | Data Output / Ready-Busy Indicator | Tri-state output delivering 16-bit read data or logic-low busy signal during write/erase |
| VSS | Ground Reference | Primary return path for all internal circuitry and I/O; must be low-impedance |
| DI | Data Input | Serial input for opcodes, addresses, and 16-bit write data; sampled on CLK rising edge |
| VCC | Power Supply | Supplies core logic and memory array; requires local 100 nF decoupling per Microchip layout guidelines |
| CS | Chip Select | Active-high enable; minimum 250 ns low time required between instructions |
| CLK | Serial Clock | Synchronizes all data transfers; supports up to 3 MHz at VCC ≥ 4.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or watchdog timeout logic in host firmware |
| Automatic ERAL before WRAL | Ensures full-array write consistency without separate erase command sequencing |
| Power-On/Off Data Protection | Hardware-level VCC monitoring prevents corruption during brown-out or startup transients |
| EWEN/EWDS Write Protection | Enables secure write gating-device powers up disabled, requiring explicit enable before programming |
| Sequential Read Mode | Allows continuous address incrementing with single CS assertion, reducing host CPU overhead |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing calibration tables, fault codes, and adaptive learning parameters in engine management systems. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to MCU SPI/Microwire peripheral. Use Value: Automotive temperature rating and 200-year retention ensure data integrity across vehicle lifetime without backup battery. | Use Scenario: Holding user-defined I/O mapping, ladder logic settings, and communication protocol parameters in programmable logic controllers. IC Role / Device Role / Timing Role: Serial EEPROM providing persistent storage for field-updatable configuration data. Use Value: 1M endurance supports frequent reconfiguration during commissioning and maintenance cycles. |
| Medical Infusion Pump Calibration | Smart Meter Firmware Parameterization |
Use Scenario: Securing dose-rate lookup tables and safety-critical calibration coefficients in Class II medical devices. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory accessed during boot and runtime calibration checks. Use Value: EWEN/EWDS protection prevents accidental overwrite of calibrated values during normal operation. | Use Scenario: Storing tariff schedules, metering constants, and communication keys in utility smart meters deployed in harsh outdoor environments. IC Role / Device Role / Timing Role: High-reliability serial EEPROM interfacing to metrology SoC via Microwire bus. Use Value: −40°C to +125°C operation and Pb-free compliance meet ANSI C12.1 and IEC 62056 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66CT-E/OT | Includes ORG pin for runtime 8/16-bit word size selection; otherwise identical voltage/temp specs | Requires external logic level on ORG pin; adds flexibility but increases BOM count vs fixed 16-bit use case | Select only if dynamic word-width switching is required; 93LC66BT-E/OT is simpler and lower-cost for dedicated 16-bit systems |
| AT25DF041A-SH-B | 4 Mbit SPI flash with sector erase; no Ready/Busy pin; higher density but slower write latency (20 ms typical) | Not drop-in compatible-different instruction set, no Microwire support, no hardware write protection | Use only when migrating to SPI-based architecture with larger storage needs; not a functional substitute for 93LC66BT-E/OT's EEPROM behavior |
Compared with 93LC66CT-E/OT, the 93LC66BT-E/OT eliminates ORG pin routing complexity and reduces firmware initialization steps; compared with AT25DF041A-SH-B, it offers guaranteed byte-level write endurance, deterministic 6 ms write time, and native hardware write disable-critical for safety-critical parameter storage.
Availability
93LC66BT-E/OT is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC configuration, and medical device calibration requiring stable component supply across extended temperature and high-reliability lifecycles.
Supply support for 93LC66BT-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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, serving automotive, industrial, consumer, and communications markets.
The 93LC66 series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for low-pin-count, low-power, high-reliability nonvolatile storage in resource-constrained embedded systems.
FAQ
What is the memory organization of the 93LC66BT-E/OT?
The 93LC66BT-E/OT has a fixed 256 × 16-bit (4 Kbit) organization. As a 'B'-suffix device, it does not use the ORG pin-its word width is permanently configured for 16-bit access, unlike 'C' variants which support runtime selection. This simplifies hardware design and eliminates ORG pin biasing requirements in the 93LC66BT-E/OT implementation.
Does the 93LC66BT-E/OT require an external pull-up resistor on the DO pin?
No, the 93LC66BT-E/OT does not require an external pull-up on DO. The DO pin is actively driven high or low during READ or Ready/Busy states, and enters High-Z only when CS is low or during idle periods. However, if DI and DO are shorted (shared bus), a current-limiting resistor is recommended to prevent bus conflict during the dummy-zero phase of READ operations.
How is write protection implemented in the 93LC66BT-E/OT?
The 93LC66BT-E/OT uses hardware-based Erase/Write Enable/Disable (EWEN/EWDS) commands. It powers up in EWDS mode, blocking all erase/write operations until an explicit EWEN instruction is issued. After each write, executing EWDS restores protection-preventing accidental overwrites due to noise or software faults. This is independent of VCC monitoring and complements the built-in POR detection.
What is the maximum clock frequency supported by the 93LC66BT-E/OT at 3.3 V?
At VCC = 3.3 V, the 93LC66BT-E/OT supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1). This applies across its full operating temperature range (−40°C to +125°C). Exceeding this limit may result in setup/hold violations and unreliable opcode or data capture during READ, WRITE, or ERASE sequences.
Can the 93LC66BT-E/OT be used in place of the 93LC66AT-E/OT?
No-the 93LC66BT-E/OT and 93LC66AT-E/OT are not interchangeable. The 'B' version provides 256 × 16-bit organization, while the 'A' version provides 512 × 8-bit organization. Their instruction sets differ: 93LC66BT-E/OT uses 12-clock-cycle instructions with 9-bit addresses, whereas 93LC66AT-E/OT uses 20-clock-cycle instructions with 9-bit addresses but outputs only 8 bits per READ. Firmware and hardware addressing logic must be redesigned for substitution.
93LC66BT-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:
- 4Kbit
- Memory Organization:
- 256 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
93LC66BT-E/OT FAQ
1.How can I place an order for 93LC66BT-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BT-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 93LC66BT-E/OT reliable?
The price and inventory of 93LC66BT-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 93LC66BT-E/OT is usually 5 days.
3.What payment methods are accepted for 93LC66BT-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BT-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BT-E/OT?
93LC66BT-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BT-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 93LC66BT-E/OT?
For technical support, including 93LC66BT-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BT-E/OT requirements.
6.How does Aetrix verify that 93LC66BT-E/OT is sourced from the original manufacturer or authorized distributors?
All 93LC66BT-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 93LC66BT-E/OT meets industry standards.
7.What is the process for return or replacement of 93LC66BT-E/OT?
All 93LC66BT-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BT-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 93LC66BT-E/OT part is unused and in its original packaging.
Return procedure for 93LC66BT-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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