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Microchip Technology 93LC66CXT-E/SN
- Part No.:
- 93LC66CXT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66CXT-E/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,533
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Product details
Overview
93LC66CXT-E/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with Microwire-compatible 3-wire interface, ORG-pin-selectable 8-/16-bit word organization, and automotive-grade temperature range (–40°C to +125°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 engine control units and automotive sensor calibration storage.
For engineers reviewing the 93LC66CXT-E/SN datasheet, 93LC66CXT-E/SN pinout, 93LC66CXT-E/SN application, or 93LC66CXT-E/SN equivalent, key selection criteria include VCC range (2.5–5.5 V), ORG-pin configuration flexibility, Ready/Busy status signaling via DO, sequential read capability, and automotive-qualified reliability for safety-critical nonvolatile memory tasks.
Technical Context
The 93LC66CXT-E/SN implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals, where instruction execution begins on detection of a Start condition (CS high + DI high at CLK rising edge). Memory organization is dynamically selected by the ORG pin: logic high enables 256 × 16-bit mode; logic low enables 512 × 8-bit mode.
It supports full command set including READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS, with Ready/Busy status reported on DO during erase/write operations. All programming cycles are self-timed: TWC = 6 ms for erase/write (93LC versions), TE C = 6 ms for ERAL, and TWL = 15 ms for WRAL - all requiring VCC ≥ 4.5 V for ERAL/WRAL execution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8 or 256 × 16, selectable via ORG pin) |
| VCC operating range | 2.5 V to 5.5 V - supports wide-input industrial and automotive power rails |
| Temperature grade | Automotive (E): –40°C to +125°C - qualified for under-hood and ADAS applications |
| Endurance | 1,000,000 erase/write cycles - ensures long-term field reliability in firmware update storage |
| Data retention | Greater than 200 years at +25°C - guarantees calibration data integrity over product lifetime |
| Interface | 3-wire Microwire-compatible serial (CS, CLK, DI/DO) - minimal GPIO usage on host microcontroller |
| Write cycle time | 6 ms max (TWC) - deterministic timing for real-time system scheduling |
Pinout & Package
93LC66CXT-E/SN is packaged in an 8-lead SOIC (SN) with Pb-free Matte Tin finish. Pin 1 is CS; pin 2 is CLK; pin 3 is DI; pin 4 is DO; pin 5 is VSS; pin 6 is ORG; pin 7 is NC; pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable: device enters standby when low; required 250 ns minimum low time between instructions |
| CLK | Serial Clock | Synchronizes all data transfers; opcodes, addresses, and data clocked on rising edge |
| DI | Data Input | Receives Start bit, opcode, address, and write data; must be stable before first CLK rising edge after CS high |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference for all digital and analog circuitry; must be low-impedance connection |
| ORG | Organization Select | Logic high → 256 × 16-bit mode; logic low → 512 × 8-bit mode; must be externally biased |
| NC | No Connection | Internally unconnected; no external tie required; may be left floating or grounded |
| VCC | Power Supply | Supplies core logic and memory array; requires local 0.1 µF bypass capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin word-size selection | Enables single hardware design to support both 8-bit and 16-bit host interfaces without firmware change |
| Self-timed erase/write | Eliminates need for external timing control or polling delay loops in host firmware |
| Automatic ERAL before WRAL | Guarantees clean memory state prior to bulk write - prevents partial-write corruption |
| Power-on/off data protection | Hardware-level lockout below VCC threshold (1.5 V) prevents spurious writes during brown-out |
| Ready/Busy status on DO | Allows efficient polling instead of fixed delays - reduces worst-case latency in time-constrained systems |
Applications
| Engine Control Unit (ECU) Calibration Storage | Automotive Sensor Offset Compensation |
|---|---|
Use Scenario: Storing trim values for fuel injection timing and air-fuel ratio correction across vehicle lifetime. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 200-year data retention and 1M-cycle endurance under thermal cycling. Use Value: Enables field-updatable calibration without requiring reprogramming of main MCU flash - reducing service cost and downtime. | Use Scenario: Holding factory-set offset compensation for wheel speed sensors exposed to under-hood temperatures up to +125°C. IC Role / Device Role / Timing Role: Automotive-grade EEPROM providing deterministic 6 ms write time and ERAL/WRAL support for batch recalibration. Use Value: Eliminates need for external voltage supervisors or software-based write-protection schemes - simplifying BOM and layout. |
| ADAS Camera Module Lens Adjustment | Infotainment System UI Configuration |
Use Scenario: Saving motorized lens position offsets after factory auto-focus calibration in surround-view camera modules. IC Role / Device Role / Timing Role: Serial EEPROM interfaced directly to camera SoC via 3-wire Microwire, leveraging ORG pin for 16-bit alignment with image pipeline registers. Use Value: Reduces PCB footprint vs parallel EEPROMs while maintaining deterministic write timing for production-line calibration stations. | Use Scenario: Persisting user preferences (language, display brightness, audio EQ) across power cycles in head-unit infotainment systems. IC Role / Device Role / Timing Role: Low-power (1 µA standby current) serial memory supporting fast sequential reads for UI state restoration. Use Value: Achieves <100 ms UI resume time due to predictable 20-clock-cycle READ instruction and no initialization delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66BT-E/SN | Dedicated 256 × 16-bit organization (no ORG pin); same VCC range and temp grade | Lacks ORG flexibility - requires fixed 16-bit host interface; simpler routing but less design reuse | Select when host MCU only supports 16-bit serial access and board space allows dedicated variant |
| AT25DF041A-SHN-T | SPI interface (4-wire), 4 Mbit density, sector erase, 2.7–3.6 V only | Higher density and faster SPI clock (20 MHz), but incompatible protocol and narrower VCC range | Choose for new designs needing >4 Kbit capacity and SPI-native hosts; not drop-in compatible |
Compared with 93LC66BT-E/SN, the 93LC66CXT-E/SN offers hardware-configurable word size - enabling one PCB to serve both 8-bit and 16-bit microcontrollers. Versus AT25DF041A-SHN-T, it provides broader VCC compatibility and Microwire simplicity but lower density and slower interface.
Availability
93LC66CXT-E/SN is available at Aetrix Electronics and suitable for automotive ECU calibration storage, ADAS sensor compensation, and infotainment UI configuration requiring stable component supply across extended product lifecycles.
Supply support for 93LC66CXT-E/SN 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 93LC66CXT-E/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-power, and automotive-qualified nonvolatile memory applications requiring simple 3-wire control and long-term data integrity.
FAQ
What is the function of the ORG pin on the 93LC66CXT-E/SN?
The ORG pin on the 93LC66CXT-E/SN selects memory organization: tied to VCC it configures the device as 256 × 16-bit; tied to VSS it configures as 512 × 8-bit. This pin is mandatory for operation - floating is not allowed. The 93LC66CXT-E/SN requires external pull-up or pull-down to ensure valid logic level, unlike A/B variants which omit this pin entirely.
Does the 93LC66CXT-E/SN support sequential read mode?
Yes, the 93LC66CXT-E/SN supports sequential read: when CS remains high after a READ instruction, the internal address counter automatically increments and outputs subsequent memory locations on DO. Each byte or word is delivered on successive CLK rising edges, eliminating the need to reissue address commands - reducing host CPU overhead in configuration loading scenarios.
What is the minimum VCC required for reliable operation of the 93LC66CXT-E/SN?
The 93LC66CXT-E/SN requires VCC ≥ 2.5 V for guaranteed functional operation across its full automotive temperature range (–40°C to +125°C). Below 2.5 V, the device enters hardware write-protection mode - all erase/write instructions are inhibited, and the DO pin remains High-Z. This threshold is fixed and not adjustable.
How does the Ready/Busy status work on the 93LC66CXT-E/SN?
The 93LC66CXT-E/SN reports Ready/Busy status on the DO pin: during erase or write cycles, DO goes low to indicate active programming, and returns high when complete. To sample status, CS must be brought high for ≥250 ns after TCSL, then DO sampled on CLK rising edges. Issuing a Start bit followed by CS low clears the status flag.
Is the 93LC66CXT-E/SN pin-compatible with other 93XX66 variants in SOIC-8 package?
Yes, the 93LC66CXT-E/SN shares identical 8-lead SOIC (SN) pinout with all 93XX66A/B/C variants - including CS, CLK, DI, DO, VSS, ORG/NC, NC/VSS, and VCC assignments. However, pin 6 (ORG) is functional only on 'C' versions; on 'A'/'B' devices it is NC. Thus, direct replacement is electrically safe but may require ORG biasing changes in schematic.
93LC66CXT-E/SN 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:
- 3 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:
- 8-SOIC
93LC66CXT-E/SN FAQ
1.How can I place an order for 93LC66CXT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66CXT-E/SN 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 93LC66CXT-E/SN reliable?
The price and inventory of 93LC66CXT-E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66CXT-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC66CXT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66CXT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66CXT-E/SN?
93LC66CXT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66CXT-E/SN 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 93LC66CXT-E/SN?
For technical support, including 93LC66CXT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66CXT-E/SN requirements.
6.How does Aetrix verify that 93LC66CXT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66CXT-E/SN 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 93LC66CXT-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC66CXT-E/SN?
All 93LC66CXT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66CXT-E/SN, 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 93LC66CXT-E/SN part is unused and in its original packaging.
Return procedure for 93LC66CXT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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