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Microchip Technology 93LC66BT-E/ST15KVAO
- Part No.:
- 93LC66BT-E/ST15KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
93LC66BT-E/ST15KVAO.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,316
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Product details
Overview
93LC66BT-E/ST15KVAO from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 256 × 16-bit organization, operating across 2.5–5.5 V supply and rated for automotive temperature range (−40°C to +125°C). It features Microwire-compatible 3-wire serial interface (CS, CLK, DI, DO), self-timed erase/write cycles, automatic ERAL before WRAL, and power-on/off data protection. It is used in automotive body control modules for storing calibration data and configuration parameters.
For engineers reviewing the 93LC66BT-E/ST15KVAO datasheet, 93LC66BT-E/ST15KVAO pinout, 93LC66BT-E/ST15KVAO application, or 93LC66BT-E/ST15KVAO equivalent, key selection criteria include its automotive-grade temperature rating, 16-bit word organization, 6 ms typical write cycle time, Ready/Busy status via DO pin, and TSSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The 93LC66BT-E/ST15KVAO implements a synchronous Microwire-compatible serial interface with start-bit detection, requiring CS and DI high on the first rising CLK edge to initiate communication. Its internal logic supports dedicated 16-bit organization (no ORG pin function), eliminating external configuration logic needed in C-variant devices.
It uses self-timed auto-erase-before-write architecture: each WRITE instruction triggers full sector erase followed by programming, completing in ≤6 ms at VCC ≥2.5 V. The DO pin serves dual role-serial data output during READ and active-low Ready/Busy indicator during erase/write operations when CS is reasserted after ≥250 ns low time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (256 × 16-bit) - fixed 16-bit word width simplifies microcontroller firmware handling of aligned data. |
| VCC Range | 2.5 V to 5.5 V - supports direct connection to 3.3 V or 5 V rails without level-shifting in automotive ECUs. |
| Write Cycle Time | ≤6 ms (typical) - enables fast parameter updates during vehicle ignition-on diagnostics or calibration uploads. |
| Endurance | 1,000,000 erase/write cycles - sufficient for lifetime logging in telematics or adaptive learning systems. |
| Data Retention | >200 years at +25°C - ensures nonvolatile storage integrity over full vehicle service life without refresh. |
| Temperature Range | −40°C to +125°C (Automotive E grade) - qualified for under-hood or transmission control unit mounting locations. |
| Interface | 3-wire Microwire (CS, CLK, DI, DO) - minimal GPIO usage; no SPI mode bits or chip-select timing constraints beyond TCSL ≥250 ns. |
Pinout & Package
93LC66BT-E/ST15KVAO is housed in an 8-lead TSSOP (ST) package, 3.0 mm × 4.4 mm, 0.65 mm pitch, with exposed pad optional for thermal relief. Pin 1 marked by laser dot; pin 1 ID corner matches standard JEDEC TSSOP orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; deselects device into standby (ICC ≤5 µA). |
| 2 (CLK) | Serial Clock | Positive-edge synchronous clock; max 3 MHz at VCC ≥4.5 V; stoppable mid-transfer without corruption. |
| 3 (DI) | Data Input | Accepts start bit, opcode, address, and data; high-impedance when CS = low; requires pull-down if unused. |
| 4 (DO) | Data Output / Status | Tri-state output: data during READ, active-low Ready/Busy during programming, High-Z otherwise. |
| 5 (VSS) | Ground | Reference return path; connect directly to PCB ground plane; shared with exposed pad if used. |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice; not bonded. |
| 7 (ORG) | Organization | No internal connection on 'B' devices - pin is NC; no external bias required; does not affect operation. |
| 8 (VCC) | Power Supply | 2.5–5.5 V supply; includes POR circuitry that inhibits writes below ~1.5 V; decoupling capacitor mandatory. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing control - microcontroller polls DO pin instead of managing fixed delays, reducing firmware complexity. |
| Automatic ERAL before WRAL | Ensures full-array write reliability without separate erase command sequence, preventing partial-program corruption. |
| Power-On/Off Data Protection | Hardware-level write inhibition below VCC threshold (~1.5 V) prevents accidental writes during brown-out or hot-swap events. |
| Ready/Busy Status Signal | DO pin provides real-time programming status without requiring status register reads - reduces bus traffic and latency. |
| 1,000,000 Endurance Cycles | Supports frequent recalibration or event logging (e.g., airbag deployment counters) over 15+ year vehicle lifespan. |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) |
|---|---|
Use Scenario: Storing seat position memory, mirror angle presets, and lighting configuration profiles across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with 16-bit word alignment matching MCU register width for efficient read/write bursts. Use Value: Enables zero-latency recall of user preferences at power-up; automotive temperature rating ensures reliability in door module enclosures. | Use Scenario: Holding fuel trim adaptation values and misfire history logs updated during closed-loop operation. IC Role / Device Role / Timing Role: Field-updatable calibration storage accessed during idle periods; DO pin status allows concurrent CPU tasks during write. Use Value: Supports dynamic engine tuning without external supervision; 1M endurance accommodates daily recalibration over 15-year service life. |
| Transmission Control Module (TCM) | Advanced Driver Assistance System (ADAS) Camera ECU |
Use Scenario: Recording gear shift learning patterns and clutch wear compensation tables accumulated over vehicle mileage. IC Role / Device Role / Timing Role: High-reliability data logger interfaced via minimal 3-wire bus to reduce BOM count and routing congestion. Use Value: Maintains adaptive transmission behavior across battery disconnects; 125°C rating survives under-dash mounting near exhaust heat paths. | Use Scenario: Storing lens distortion correction coefficients and camera alignment offsets calibrated during factory setup. IC Role / Device Role / Timing Role: One-time programmable configuration storage with guaranteed retention >200 years - no field updates required. Use Value: Eliminates need for OTP fuses or flash-based NVM; TSSOP-8 footprint fits tight space behind compact camera housing. |
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/ST | Includes functional ORG pin (configurable 8/16-bit); same VCC range, temp grade, and package. | Requires external logic or MCU GPIO to drive ORG; adds flexibility but increases design complexity. | Select only if future firmware may require runtime word-size switching; otherwise 93LC66BT-E/ST15KVAO offers simpler, pin-optimized implementation. |
| AT25DF041A-SH-B | 4 Mbit SPI NOR Flash; quad I/O capable; no built-in erase/write protection logic; requires software-managed sector erase. | Higher density but slower random-write performance; lacks hardware write-protection and auto-erase. | Choose only for code storage or large log buffers; unsuitable as drop-in replacement due to interface, timing, and protection model differences. |
Compared with 93LC66CT-E/ST, the 93LC66BT-E/ST15KVAO eliminates ORG pin management overhead and guarantees deterministic 16-bit access, while AT25DF041A-SH-B trades EEPROM simplicity for density and speed in non-parameter-storage roles.
Availability
93LC66BT-E/ST15KVAO is available at Aetrix Electronics and suitable for automotive body control, engine management, and ADAS camera calibration applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned sourcing.
Supply support for 93LC66BT-E/ST15KVAO 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC66B series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, space-constrained automotive and industrial systems requiring robust nonvolatile storage with minimal interface overhead.
FAQ
What is the memory organization of the 93LC66BT-E/ST15KVAO?
The 93LC66BT-E/ST15KVAO has a fixed 256 × 16-bit organization - it is a 'B'-suffix device, meaning no ORG pin functionality. All read and write operations transfer 16-bit words, and the ORG pin is internally disconnected (NC). This eliminates external configuration logic and simplifies firmware integration compared to 'C' variants.
Does the 93LC66BT-E/ST15KVAO require an external pull-up on the DO pin?
No, the 93LC66BT-E/ST15KVAO does not require an external pull-up on the DO pin. The DO pin is actively driven high or low during READ or Ready/Busy status reporting, and enters High-Z state otherwise. A pull-up may cause bus contention if DI and DO are shorted; Microchip recommends using a series resistor if bidirectional wiring is implemented.
What is the maximum clock frequency supported by the 93LC66BT-E/ST15KVAO at 3.3 V?
At VCC = 3.3 V, the 93LC66BT-E/ST15KVAO supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1). This applies across the full automotive temperature range (−40°C to +125°C). Exceeding this frequency risks setup/hold violations and unreliable communication.
How does the 93LC66BT-E/ST15KVAO protect against inadvertent writes during power transitions?
The 93LC66BT-E/ST15KVAO incorporates hardware power-on/power-off protection: its internal voltage detector inhibits all erase/write operations when VCC falls below ~1.5 V. Additionally, it powers up in EWDS (Erase/Write Disable) mode, requiring an explicit EWEN command before any programming - preventing corruption during brown-out or reset sequences.
Is the 93LC66BT-E/ST15KVAO RoHS compliant and lead-free?
Yes, the 93LC66BT-E/ST15KVAO is Pb-free and RoHS compliant, with Matte Tin (Sn) finish on all leads. This is confirmed in the "Features" section of DS21795E and aligns with Microchip's standard packaging for automotive-grade parts. The TSSOP-8 package (ST) meets JEDEC J-STD-020 moisture sensitivity level 3.
93LC66BT-E/ST15KVAO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
93LC66BT-E/ST15KVAO FAQ
1.How can I place an order for 93LC66BT-E/ST15KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BT-E/ST15KVAO 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/ST15KVAO reliable?
The price and inventory of 93LC66BT-E/ST15KVAO 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/ST15KVAO is usually 5 days.
3.What payment methods are accepted for 93LC66BT-E/ST15KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BT-E/ST15KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BT-E/ST15KVAO?
93LC66BT-E/ST15KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BT-E/ST15KVAO 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/ST15KVAO?
For technical support, including 93LC66BT-E/ST15KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BT-E/ST15KVAO requirements.
6.How does Aetrix verify that 93LC66BT-E/ST15KVAO is sourced from the original manufacturer or authorized distributors?
All 93LC66BT-E/ST15KVAO 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/ST15KVAO meets industry standards.
7.What is the process for return or replacement of 93LC66BT-E/ST15KVAO?
All 93LC66BT-E/ST15KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BT-E/ST15KVAO, 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/ST15KVAO part is unused and in its original packaging.
Return procedure for 93LC66BT-E/ST15KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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