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Microchip Technology 93LC66BT-I/OT15KVAO
- Part No.:
- 93LC66BT-I/OT15KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93LC66BT-I/OT15KVAO.pdf
- Description:
- IC EEPROM 4KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,790
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Product details
Overview
93LC66BT-I/OT15KVAO from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 256 × 16-bit organization, operating over 2.5–5.5 V, rated for industrial temperature (−40°C to +85°C), and housed in a Pb-free SOT-23-6 package. It implements Microwire-compatible 3-wire serial interface (CS, CLK, DI, DO), supports self-timed erase/write cycles, and delivers 1,000,000 endurance cycles with >200 years data retention - used for configuration storage in embedded microcontroller systems.
For engineers reviewing the 93LC66BT-I/OT15KVAO datasheet, 93LC66BT-I/OT15KVAO pinout, 93LC66BT-I/OT15KVAO application, or 93LC66BT-I/OT15KVAO equivalent, key selection criteria include its fixed 16-bit word size (no ORG pin), SOT-23-6 footprint compatibility, 2.5 V minimum VCC operation, Ready/Busy status via DO pin, and support for ERAL/WRAL bulk operations requiring ≥4.5 V.
Technical Context
This device belongs to the 93LC66B family - a dedicated 16-bit organization variant with no ORG pin, eliminating external configuration logic. Its Microwire protocol uses synchronous serial communication with start-bit detection, opcode-driven instruction set (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS), and status polling via DO pin during programming.
It features automatic erase-before-write, power-on/off data protection, and internal voltage monitoring (VPOR = 1.5 V). All programming modes require prior EWEN command; after write, EWDS must be issued to re-disable writes. Clock frequency supports up to 3 MHz at VCC ≥ 4.5 V, scaling down to 2 MHz at 2.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (256 × 16-bit) - provides compact nonvolatile storage for firmware parameters or calibration data in space-constrained designs. |
| VCC Range | 2.5 V to 5.5 V - enables direct interfacing with 3.3 V and 5 V microcontrollers without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates such as logging or adaptive tuning in industrial controllers. |
| Data Retention | >200 years at 25°C - ensures long-term reliability for unattended equipment like utility meters or remote sensors. |
| Interface | 3-wire Microwire (CS, CLK, DI/DO) - reduces PCB routing complexity versus SPI or I²C; requires only four signals including ground. |
| Access Time | TPD ≤ 400 ns (at 1.8 V), ≤ 200 ns (at 4.5–5.5 V) - enables fast read response for real-time configuration retrieval in time-critical applications. |
| Write Cycle Time | TWC = 6 ms (erase/write), TEC = 6 ms (ERAL), TWL = 15 ms (WRAL) - defines worst-case latency for bulk memory initialization or factory calibration. |
Pinout & Package
Package: SOT-23-6 (6-lead small-outline transistor), 2.9 mm × 1.6 mm × 1.1 mm body, Pb-free matte tin finish, JEDEC MO-178AC compliant. Pin 1 marked by laser dot; pin 1 ID corner located at top-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DO) | Data Output / Ready-Busy Indicator | Tri-state output delivering 16-bit read data or logic-low busy signal during programming; high-Z when deselected. |
| 2 (VSS) | Ground Reference | Primary return path for all internal circuitry; must be connected directly to system ground plane for noise immunity. |
| 3 (DI) | Data Input | Serial input for opcodes, addresses, and write data; accepts standard CMOS logic levels synchronized to CLK rising edge. |
| 4 (VCC) | Power Supply | Supplies core logic and memory array; bypass capacitor (0.1 µF) required within 5 mm of this pin for stable operation. |
| 5 (CS) | Chip Select | Active-high enable; falling edge initiates self-timed erase/write; must remain low ≥250 ns between instructions. |
| 6 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in DI bits and clocks out DO bits; stoppable at any point without corruption. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 16-bit organization | Eliminates need for external ORG pin control logic, simplifying PCB layout and firmware driver design. |
| Self-timed erase/write cycles | Removes requirement for external timing control or software delays - host MCU proceeds immediately after CS fall. |
| Automatic ERAL before WRAL | Guarantees full-array readiness before bulk write, preventing partial writes or data corruption during firmware update sequences. |
| Ready/Busy status on DO | Enables efficient polling-based flow control without dedicated status lines or interrupts, reducing GPIO usage. |
| Power-on data protection | Hardware-level lockout below 1.5 V prevents inadvertent writes during brown-out or power ramp-up conditions. |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
Use Scenario: Storing sensor offset/gain coefficients and linearization tables in smart pressure transmitters deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed at power-up and during field recalibration; 6 ms write latency acceptable due to infrequent updates. Use Value: Enables plug-and-play replacement without manual reprogramming; >200-year retention ensures calibration integrity across product lifetime. | Use Scenario: Holding user preferences (temperature setpoints, cycle timers, display brightness) in washing machines and dishwashers. IC Role / Device Role / Timing Role: Low-power serial EEPROM interfaced to 8-bit MCU; standby current ≤5 µA extends battery backup life during power loss. Use Value: Survives 1M+ power cycles and retains settings through 10+ years of daily use, meeting IEC 60335 safety compliance requirements. |
| Automotive Body Control Module | Medical Diagnostic Equipment |
Use Scenario: Storing door lock actuator calibration data and seat position memory in entry-level automotive BCMs. IC Role / Device Role / Timing Role: Industrial-grade EEPROM (−40°C to +85°C) storing critical operational parameters; accessed via Microwire from 16-bit MCU. Use Value: Qualified per AEC-Q100 stress tests; 2.5 V min VCC allows direct connection to 3.3 V domain without regulator overhead. | Use Scenario: Saving patient-specific therapy profiles and device calibration logs in portable ultrasound or infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory with hardware write-protection (EWDS); accessed during boot and diagnostics. Use Value: Meets IEC 62304 Class C software safety requirements via deterministic write disable behavior and 1M-cycle endurance for audit trail logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66B-I/SN | SOIC-8 package (5.0 × 4.0 mm), same 256×16-bit organization, identical electrical specs and timing. | Requires larger PCB area; better thermal dissipation and hand-solderability than SOT-23. | Select when board space permits and manual assembly or higher-reliability solder joints are prioritized. |
| AT25040B-MAHL-T | 4 Kbit SPI interface (4-wire), 1.8–5.5 V, SOIC-8, 1M endurance, but lacks ERAL/WRAL and Ready/Busy pin. | Requires SPI-capable MCU; no hardware status polling - relies on software timeout or interrupt-driven completion detection. | Select when migrating to SPI ecosystem or needing lower 1.8 V operation; accept added firmware complexity for status management. |
Compared with 93LC66B-I/SN, the 93LC66BT-I/OT15KVAO saves 70% board area and suits ultra-compact modules; versus AT25040B-MAHL-T, it offers simpler status feedback and guaranteed bulk-erase capability but requires Microwire-compatible controller support.
Availability
93LC66BT-I/OT15KVAO is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93LC66BT-I/OT15KVAO 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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC66B series targets cost-sensitive, low-power embedded systems needing reliable serial nonvolatile memory - optimized for Microwire interface simplicity, minimal pin count, and robust operation across industrial temperature ranges.
FAQ
What is the memory organization of the 93LC66BT-I/OT15KVAO?
The 93LC66BT-I/OT15KVAO is a fixed 256 × 16-bit (4 Kbit) device - designated as a 'B' version, meaning it has no ORG pin and always operates in 16-bit word mode. This eliminates external configuration logic and simplifies firmware implementation compared to 'C' variants that require ORG pin control.
Does the 93LC66BT-I/OT15KVAO support bulk erase and write operations?
Yes, the 93LC66BT-I/OT15KVAO supports both Erase All (ERAL) and Write All (WRAL) instructions. ERAL clears the entire memory array to 1s in 6 ms; WRAL performs automatic ERAL then writes user-supplied data to all locations in 15 ms - both require VCC ≥ 4.5 V for proper execution.
What is the role of the DO pin on the 93LC66BT-I/OT15KVAO during programming?
During erase or write cycles, the DO pin serves as a Ready/Busy indicator: logic-low indicates ongoing programming, logic-high signals completion. After CS is brought high for ≥250 ns, DO reflects status; issuing a Start bit then lowering CS clears the status flag, enabling immediate re-polling.
Is an external pull-up resistor required on the DO pin of the 93LC66BT-I/OT15KVAO?
No external pull-up is required on DO - the pin is actively driven high or low during READ or status polling, and enters high-impedance (High-Z) state when deselected or idle. However, if DI and DO are shorted (shared bus), a current-limiting resistor (e.g., 1 kΩ) is recommended to prevent bus conflict during dummy-zero read preamble.
What voltage threshold triggers power-on protection in the 93LC66BT-I/OT15KVAO?
The 93LC66BT-I/OT15KVAO incorporates hardware-level power-on reset protection that inhibits all write operations when VCC falls below 1.5 V (typical). This prevents data corruption during power ramp-up, brown-out, or unstable supply conditions - a feature confirmed in DS21795E Section 1.0, Parameter D11.
93LC66BT-I/OT15KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not 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 ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
93LC66BT-I/OT15KVAO FAQ
1.How can I place an order for 93LC66BT-I/OT15KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BT-I/OT15KVAO 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-I/OT15KVAO reliable?
The price and inventory of 93LC66BT-I/OT15KVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66BT-I/OT15KVAO is usually 5 days.
3.What payment methods are accepted for 93LC66BT-I/OT15KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BT-I/OT15KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BT-I/OT15KVAO?
93LC66BT-I/OT15KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BT-I/OT15KVAO 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-I/OT15KVAO?
For technical support, including 93LC66BT-I/OT15KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BT-I/OT15KVAO requirements.
6.How does Aetrix verify that 93LC66BT-I/OT15KVAO is sourced from the original manufacturer or authorized distributors?
All 93LC66BT-I/OT15KVAO 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-I/OT15KVAO meets industry standards.
7.What is the process for return or replacement of 93LC66BT-I/OT15KVAO?
All 93LC66BT-I/OT15KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BT-I/OT15KVAO, 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-I/OT15KVAO part is unused and in its original packaging.
Return procedure for 93LC66BT-I/OT15KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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