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Microchip Technology 93LC66BT-I/SN15KVAO
- Part No.:
- 93LC66BT-I/SN15KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66BT-I/SN15KVAO.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,004
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Product details
Overview
93LC66BT-I/SN15KVAO from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, Microwire-compatible 3-wire interface (CS/CLK/DI/DO), and industrial temperature range (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles - used in microcontroller configuration storage and calibration data retention.
For engineers reviewing the 93LC66BT-I/SN15KVAO datasheet, 93LC66BT-I/SN15KVAO pinout, 93LC66BT-I/SN15KVAO application, or 93LC66BT-I/SN15KVAO equivalent, key selection criteria include VCC range (2.5–5.5 V), 8-bit x512 memory map, SOIC-8 package compatibility, Ready/Busy status signaling via DO, and EWEN/EWDS write-protection logic.
Technical Context
This device implements a synchronous serial Microwire protocol with start-bit detection, opcode-driven instruction set (READ/WRITE/ERASE/ERAL/WRAL/EWEN/EWDS), and dual-mode memory access: dedicated 8-bit organization (no ORG pin function). All programming operations require prior EWEN enable and are self-timed, with DO providing real-time Ready/Busy status during erase/write.
It uses CMOS technology with on-chip voltage detection (VPOR = 1.5 V) for power-on data protection, supports sequential read, and includes automatic erase-all before write-all. The SOIC-8 package (SN suffix) places CS, CLK, DI, DO, VSS, VCC, NC, and NC on pins 1–8 respectively - with ORG unconnected per 'A'-series designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit), fixed x8 organization - no ORG pin required, simplifies PCB layout vs. configurable variants. |
| VCC operating range | 2.5 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level-shifting. |
| Endurance | 1,000,000 erase/write cycles - enables frequent field updates in calibration or logging applications. |
| Data retention | Greater than 200 years at 25°C - ensures long-term reliability in unattended embedded systems. |
| Write cycle time | 6 ms typical (TWC) - defines minimum interval between successive WRITE commands. |
| Interface | 3-wire Microwire-compatible (CS/CLK/DI/DO) - minimal GPIO usage, compatible with legacy MCU peripherals. |
| Temperature grade | Industrial (–40°C to +85°C) - qualified for use in industrial control, metering, and automotive body electronics. |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free Matte Tin finish, standard footprint compatible with JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select | Active-high enable; must be held ≥250 ns low between instructions; initiates self-timed write on falling edge for 93LC66A/B devices. |
| 2 - CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; stoppable mid-sequence. |
| 3 - DI | Data Input | Receives start bit, instruction opcodes, address bits, and write data; requires external pull-up if shared with DO. |
| 4 - DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or after status polling. |
| 5 - VSS | Ground | Reference return path for all signals; must be low-impedance connection to minimize noise coupling. |
| 6 - NC | No Connect | Internally unconnected; left floating or tied to ground per board design rules - no functional impact. |
| 7 - NC | No Connect | Same as Pin 6; dual NC pins reflect package pinout inheritance from family-wide layout (ORG not present on 'A' devices). |
| 8 - VCC | Power Supply | 2.5–5.5 V supply; internal POR circuit (1.5 V threshold) prevents spurious writes during power ramp. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or software delays - reduces firmware complexity and CPU overhead. |
| Automatic ERAL before WRAL | Guarantees full array erase prior to bulk write, preventing stale data corruption without host intervention. |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V VCC - prevents data loss during brown-out or hot-plug events. |
| EWEN/EWDS command lockout | Enables explicit write-enable discipline: device powers up in EWDS state, requiring intentional EWEN before any programming. |
| Ready/Busy status on DO | Allows non-blocking polling instead of fixed delay waits - improves system responsiveness and deterministic timing. |
Applications
| Industrial Sensor Calibration | Consumer Appliance Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and user-adjusted thresholds in HVAC or pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and field recalibration; supports sequential read for fast parameter loading. Use Value: 200-year data retention ensures calibration integrity across product lifetime without battery backup. | Use Scenario: Saving user preferences (temperature setpoints, cycle modes, display brightness) in washing machines and microwaves. IC Role / Device Role / Timing Role: Low-pin-count serial EEPROM interfaced to 8-bit MCU GPIOs; leverages 3-wire simplicity for cost-sensitive BOMs. Use Value: 1M endurance enables daily parameter updates over 10+ years of consumer use. |
| Automotive Body Control Module | Medical Diagnostic Equipment |
Use Scenario: Retaining door lock state, mirror position, and lighting profiles across ignition cycles in entry-level vehicles. IC Role / Device Role / Timing Role: Industrial-grade EEPROM (–40°C to +85°C) storing persistent settings; accessed via Microwire peripheral on body controller MCU. Use Value: VCC range (2.5–5.5 V) accommodates vehicle battery fluctuations without external regulators. | Use Scenario: Archiving calibration constants and safety-critical fault logs in portable ultrasound or glucose meters. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory with hardware write protection (EWDS default on power-up). Use Value: Power-on data protection prevents accidental overwrite during power transitions - critical for regulatory compliance. |
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 | 16-bit x256 organization (vs. 8-bit x512); same VCC, temp, and package - requires ORG pin tie-off (not applicable here). | Optimized for 16-bit MCU interfaces; incompatible address/data framing for existing 8-bit firmware. | Select only if migrating to wider bus and revising driver code. |
| AT25040B-MAU-1.8 | SPI interface (4-wire), 512 x 8-bit, 1.8–5.5 V, industrial temp - different protocol, no Ready/Busy pin, higher max clock (20 MHz). | Requires SPI peripheral and revised communication stack; lacks DO-based status polling. | Choose for higher throughput needs where SPI is already deployed and polling is handled via timeout. |
Compared with 93LC66B-I/SN, the 93LC66BT-I/SN15KVAO offers native 8-bit addressing without ORG pin management; versus AT25040B-MAU-1.8, it retains Microwire compatibility and hardware status signaling - critical for deterministic real-time systems.
Availability
93LC66BT-I/SN15KVAO 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/SN15KVAO 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC66x series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring reliable nonvolatile storage with minimal pin count and proven Microwire interoperability.
FAQ
What is the memory organization of the 93LC66BT-I/SN15KVAO?
The 93LC66BT-I/SN15KVAO is a fixed 512 × 8-bit (4 Kbit) device - designated as an 'A' variant in the 93LC66 family, meaning it has no ORG pin and operates exclusively in 8-bit mode. This eliminates external configuration logic and simplifies integration with 8-bit microcontrollers or systems requiring byte-aligned access.
Does the 93LC66BT-I/SN15KVAO support automatic erase before write operations?
Yes, the 93LC66BT-I/SN15KVAO performs auto-erase during each WRITE instruction and executes automatic ERAL (Erase All) before WRAL (Write All). This ensures data integrity without requiring separate erase commands - a key feature confirmed in DS21795E Section 2.8 and Table 1-4.
What is the function of the DO pin on the 93LC66BT-I/SN15KVAO during programming?
During erase or write cycles, the DO pin on the 93LC66BT-I/SN15KVAO outputs Ready/Busy status: logic low indicates ongoing operation, logic high confirms completion. This allows firmware to poll status without fixed delays - as specified in DS21795E Sections 2.4–2.9 and Figure 2-1 through 2-11.
Is the 93LC66BT-I/SN15KVAO RoHS compliant and Pb-free?
Yes, the 93LC66BT-I/SN15KVAO is Pb-free and RoHS compliant, using a Matte Tin (Sn) finish per Microchip's packaging specification (DS21795E-page 1). The 'SN' in the part number denotes the 8-lead SOIC package with this environmentally compliant plating.
How does write protection work on the 93LC66BT-I/SN15KVAO?
Write protection is enforced via EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) instructions. The 93LC66BT-I/SN15KVAO powers up in EWDS state; an explicit EWEN command is required before any ERASE or WRITE. DS21795E Section 2.6 confirms this prevents accidental overwrites - a hardware-level safeguard independent of software state.
93LC66BT-I/SN15KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
93LC66BT-I/SN15KVAO FAQ
1.How can I place an order for 93LC66BT-I/SN15KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BT-I/SN15KVAO 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/SN15KVAO reliable?
The price and inventory of 93LC66BT-I/SN15KVAO 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/SN15KVAO is usually 5 days.
3.What payment methods are accepted for 93LC66BT-I/SN15KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BT-I/SN15KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BT-I/SN15KVAO?
93LC66BT-I/SN15KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BT-I/SN15KVAO 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/SN15KVAO?
For technical support, including 93LC66BT-I/SN15KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BT-I/SN15KVAO requirements.
6.How does Aetrix verify that 93LC66BT-I/SN15KVAO is sourced from the original manufacturer or authorized distributors?
All 93LC66BT-I/SN15KVAO 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/SN15KVAO meets industry standards.
7.What is the process for return or replacement of 93LC66BT-I/SN15KVAO?
All 93LC66BT-I/SN15KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BT-I/SN15KVAO, 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/SN15KVAO part is unused and in its original packaging.
Return procedure for 93LC66BT-I/SN15KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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