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Microchip Technology 93LC66CT-E/SN15KVAO
- Part No.:
- 93LC66CT-E/SN15KVAO
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66CT-E/SN15KVAO.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,647
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Product details
Overview
93LC66CT-E/SN15KVAO from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 256 × 16-bit organization (ORG pin enabled), automotive-grade temperature range (–40°C to +125°C), and 1,000,000 erase/write cycles. It serves as nonvolatile configuration storage in automotive control modules requiring robust data retention and power-on/off protection.
For engineers reviewing the 93LC66CT-E/SN15KVAO datasheet, 93LC66CT-E/SN15KVAO pinout, 93LC66CT-E/SN15KVAO application, or 93LC66CT-E/SN15KVAO equivalent, key selection criteria include VCC range (2.5–5.5 V), ORG-configurable x16 mode, ERAL/WRAL support, Ready/Busy status signaling via DO, and automotive qualification per AEC-Q100 Class 0 requirements.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, and DI/DO lines. Memory access is controlled by 12-bit opcodes and address fields, supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS commands. The ORG pin selects between x8 (low) and x16 (high) word organization - for 93LC66CT-E/SN15KVAO, ORG is functional and required for x16 operation.
Internal self-timed erase/write cycles (6 ms typical for ERAL/WRAL, 2 ms for 93C-series write) eliminate external timing control. Power-on reset circuitry disables writes below 1.5 V (93LC variant), and automatic ERAL precedes WRAL. Data output toggles on CLK rising edge with TPD ≤ 400 ns at 1.8 V, and DO provides Ready/Busy status polling during programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (256 × 16-bit organization with ORG = VCC) |
| VCC range | 2.5 V to 5.5 V - supports wide-input automotive supply rails without regulation |
| Endurance | 1,000,000 erase/write cycles - enables frequent firmware parameter updates in control units |
| Data retention | 200 years at 25°C - ensures long-term calibration and configuration integrity |
| Temp range | –40°C to +125°C (Automotive E grade) - qualified for under-hood and transmission control applications |
| Interface | Microwire 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, compatible with legacy microcontrollers |
| Write cycle time | 6 ms max (ERAL/WRAL), 2 ms max (WRITE) - deterministic timing for real-time system scheduling |
Pinout & Package
8-lead SOIC package (SN suffix), Pb-free Matte Tin finish, 150-mil body width. 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 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed programming on falling edge (93LC) |
| 2 (CLK) | Serial Clock | Synchronizes opcode/address/data transfer on rising edge; stoppable at any level for master flexibility |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; high-impedance when not selected |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| 5 (VSS) | Ground | Reference return path for all I/O and internal logic; decoupling capacitor required near pin |
| 6 (ORG) | Organization Control | Logic high selects x16 mode (256 words × 16 bits); logic low selects x8 mode (512 words × 8 bits) |
| 7 (NC) | No Connection | Internally unconnected; must be left floating or tied to VSS/VCC per layout best practice |
| 8 (VCC) | Power Supply | 2.5–5.5 V input; internal POR circuit blocks writes below 1.5 V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing circuitry; 6 ms ERAL/WRAL and 2 ms WRITE guarantee deterministic completion |
| Auto-ERAL before WRAL | Ensures full array readiness prior to bulk write - no separate ERAL command needed in firmware |
| Ready/Busy status on DO | Enables polling-based synchronization without interrupt pins or fixed delays in host MCU code |
| Power-on/off data protection | Hardware lockout below 1.5 V prevents corruption during brown-out or hot-swap events |
| EWEN/EWDS security | Explicit enable/disable sequence prevents accidental writes - EWDS issued after every write per spec recommendation |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing adaptive fuel trim tables, knock sensor calibration offsets, and emission-related fault codes across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced to 8-bit/16-bit MCU via Microwire; x16 mode optimizes bandwidth for multi-parameter records. Use Value: 200-year data retention and 1M endurance ensure calibration persistence over vehicle lifetime without refresh overhead. | Use Scenario: Holding camera lens focus profiles, radar beamforming coefficients, and sensor fusion metadata in parking assist modules. IC Role / Device Role / Timing Role: Parameter storage with fast WRAL capability for batch updates during system initialization or OTA reconfiguration. Use Value: 6 ms ERAL + WRAL sequence enables full memory reload in <12 ms - meets ADAS boot-time constraints. |
| Transmission Control Module (TCM) | Body Control Module (BCM) |
Use Scenario: Retaining gear shift adaptation maps, clutch wear compensation values, and diagnostic trouble codes in harsh under-hood environments. IC Role / Device Role / Timing Role: Automotive-qualified EEPROM providing fail-safe storage for torque management parameters accessed during real-time control loops. Use Value: –40°C to +125°C operation and built-in POR prevent data corruption during thermal cycling or voltage transients. | Use Scenario: Saving user preferences (seat position, mirror angle, lighting themes), door lock configurations, and battery load management history. IC Role / Device Role / Timing Role: Low-power serial memory enabling infrequent but critical writes during vehicle sleep/wake transitions. Use Value: 1 µA standby current (I-temp) and 5 µA (E-temp) minimize parasitic drain on 12 V battery during extended parking. |
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 | Dedicated x16 organization (no ORG pin); industrial temp only (–40°C to +85°C); same 2.5–5.5 V VCC | Lacks automotive qualification; unsuitable for under-hood or transmission systems requiring E-grade reliability | Select only for cost-sensitive industrial controls where ambient temperature stays below 85°C |
| AT25DF041A-SSH-T | SPI interface (4-wire), 4 Mbit density, sector erase, 2.7–3.6 V VCC only; no ORG pin or WRAL instruction | Higher density but incompatible protocol; requires SPI-capable host and different firmware driver stack | Choose when migrating to SPI-based platforms or needing >4 Kbit capacity with faster sequential reads |
Compared with 93LC66B-I/SN, the 93LC66CT-E/SN15KVAO adds automotive qualification and ORG flexibility; compared with AT25DF041A-SSH-T, it retains Microwire compatibility and lower VCC minimum but trades density for protocol simplicity and deterministic WRAL timing.
Availability
93LC66CT-E/SN15KVAO is available at Aetrix Electronics and suitable for automotive control units, ADAS subsystems, and industrial programmable logic controllers requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant nonvolatile memory.
Supply support for 93LC66CT-E/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 93LC66 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-effective, low-pin-count nonvolatile storage in automotive, industrial, and consumer systems where Microwire compatibility and robust data integrity are essential.
FAQ
What is the function of the ORG pin on the 93LC66CT-E/SN15KVAO?
The ORG pin on the 93LC66CT-E/SN15KVAO selects memory organization: logic high (VCC) configures 256 × 16-bit mode, logic low (VSS) configures 512 × 8-bit mode. Unlike A/B variants, the 'C' version requires this pin to be externally biased - it is not NC. This dual-mode capability allows one 93LC66CT-E/SN15KVAO footprint to serve both byte- and word-oriented host interfaces.
Does the 93LC66CT-E/SN15KVAO support automatic erase before write operations?
Yes, the 93LC66CT-E/SN15KVAO performs automatic erase before each WRITE instruction. Additionally, the WRAL command includes an implicit ERAL cycle - no separate ERAL instruction is required before WRAL. Both operations are self-timed (6 ms typical for ERAL/WRAL), eliminating need for external delay loops in host firmware.
What is the maximum clock frequency supported by the 93LC66CT-E/SN15KVAO at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93LC66CT-E/SN15KVAO supports a maximum clock frequency of 2 MHz, as specified in Table 1-2 (A1). This applies to all 93LC66A/B/C devices at 2.5 V ≤ VCC < 5.5 V. Exceeding this frequency risks setup/hold violations and unreliable opcode decoding.
How does the Ready/Busy status work on the DO pin of the 93LC66CT-E/SN15KVAO?
The DO pin of the 93LC66CT-E/SN15KVAO outputs Ready/Busy status during erase/write cycles: logic low indicates ongoing programming, logic high signals completion. To read status, CS must be brought high for ≥250 ns after TCSL, then DO sampled. Issuing a Start bit followed by CS low clears the status flag. DO returns to High-Z on CS falling edge.
Is the 93LC66CT-E/SN15KVAO RoHS compliant and Pb-free?
Yes, the 93LC66CT-E/SN15KVAO is Pb-free and RoHS compliant, using Matte Tin (Sn) finish per Microchip's packaging specification. This is confirmed in the "Features" section of DS21795E and applies to all packages including the SN (SOIC) variant. The "3e" marking on the package denotes JEDEC-compliant Pb-free designation.
93LC66CT-E/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:
- 512 x 8, 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-SOIC
93LC66CT-E/SN15KVAO FAQ
1.How can I place an order for 93LC66CT-E/SN15KVAO through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66CT-E/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 93LC66CT-E/SN15KVAO reliable?
The price and inventory of 93LC66CT-E/SN15KVAO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66CT-E/SN15KVAO is usually 5 days.
3.What payment methods are accepted for 93LC66CT-E/SN15KVAO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66CT-E/SN15KVAO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66CT-E/SN15KVAO?
93LC66CT-E/SN15KVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66CT-E/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 93LC66CT-E/SN15KVAO?
For technical support, including 93LC66CT-E/SN15KVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66CT-E/SN15KVAO requirements.
6.How does Aetrix verify that 93LC66CT-E/SN15KVAO is sourced from the original manufacturer or authorized distributors?
All 93LC66CT-E/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 93LC66CT-E/SN15KVAO meets industry standards.
7.What is the process for return or replacement of 93LC66CT-E/SN15KVAO?
All 93LC66CT-E/SN15KVAO units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66CT-E/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 93LC66CT-E/SN15KVAO part is unused and in its original packaging.
Return procedure for 93LC66CT-E/SN15KVAO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC66CT-E/SN15KVAO Tags
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