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Microchip Technology 93LC66BXT-E/SN
- Part No.:
- 93LC66BXT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66BXT-E/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,498
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Product details
Overview
93LC66BXT-E/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with dedicated 16-bit organization, 256 × 16-bit memory array, 2.5–5.5 V supply range, and automotive-grade temperature support (−40°C to +125°C). It uses Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), features self-timed erase/write cycles, and is used for nonvolatile parameter storage in engine control units and automotive sensor modules.
For engineers reviewing the 93LC66BXT-E/SN datasheet, 93LC66BXT-E/SN pinout, 93LC66BXT-E/SN application, or 93LC66BXT-E/SN equivalent, key selection criteria include its 16-bit word width, automotive temperature rating, ERAL/WRAL command support, Ready/Busy status signaling via DO, and compatibility with microcontroller SPI-like serial peripherals requiring minimal GPIO overhead.
Technical Context
The 93LC66BXT-E/SN implements a synchronous Microwire-compatible serial protocol with start-bit detection, fixed 16-bit instruction framing (READ/WRITE/ERASE), and hardware-based power-on data protection. Its internal architecture includes an address decoder, mode decode logic, and output buffer controlled by CS and CLK edges.
It operates exclusively in x16 mode (no ORG pin-tied internally), supports sequential read, automatic ERAL before WRAL, and requires EWEN/EWDS commands to gate erase/write access. Ready/Busy status is polled on DO after CS high assertion following TCSL ≥250 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (256 × 16-bit) - provides compact, byte-aligned storage for calibration tables or configuration registers in space-constrained automotive modules. |
| VCC range | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V MCU I/O domains without level shifting in engine control and body electronics. |
| Endurance | 1,000,000 erase/write cycles - supports frequent firmware update logging or adaptive learning algorithms over full vehicle lifetime. |
| Data retention | >200 years at 25°C - ensures long-term integrity of safety-critical calibration data without refresh requirements. |
| Write cycle time | 6 ms typical (TWC) - enables deterministic timing budgeting for write operations in real-time control loops. |
| Interface | 3-wire Microwire (CS/CLK/DI/DO) - reduces MCU pin count vs. SPI; no MISO/MOSI separation needed; DI/DO can share bus with external pull-up. |
| Temp grade | Automotive (E): −40°C to +125°C - qualified for under-hood and transmission control applications per AEC-Q100 stress requirements. |
Pinout & Package
93LC66BXT-E/SN is housed in an 8-lead SOIC package (SN suffix), with lead pitch 1.27 mm, body width 3.9 mm, and RoHS-compliant matte tin finish. Pin 1 is marked by laser dot; pin 1 ID corner is bottom-left when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable: must be held high ≥250 ns between instructions; falling edge initiates self-timed write/erase on 93LC devices. |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-transfer without state corruption. |
| DI | Data Input | Accepts start bit, 4-bit opcode, 8-bit address, and 16-bit data; tolerant of bus conflicts when shared with DO (requires series resistor). |
| DO | Data Output / Status | Outputs 16-bit read data or Ready/Busy (low = busy); enters High-Z when CS low or during standby. |
| VSS | Ground | Reference for all I/O and internal logic; must be low-impedance connection to avoid noise-induced write errors. |
| NC | No internal connection | Pin 7 in SOIC (SN) package - left unconnected; not bonded; no electrical function. |
| VCC | Power Supply | Supplies core and I/O circuitry; internal POR triggers at ~1.5 V; must be ≥4.5 V for ERAL/WRAL execution. |
| ORG | Organization select | Not present - 93LC66B is fixed x16 device; ORG pin omitted (NC in pin table); no external configuration required. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or watchdog timeout - simplifies firmware driver design and reduces CPU polling overhead. |
| ERAL before WRAL | Guarantees full-array erase prior to bulk write - prevents stale data remnants and ensures deterministic memory initialization. |
| Power-on/off data protection | Hardware lockout below 1.5 V VCC - prevents partial writes during brown-out or hot-swap events in automotive power systems. |
| Ready/Busy status on DO | Enables non-blocking operation: MCU can execute other tasks while polling DO high/low instead of fixed delays. |
| EWEN/EWDS security | Prevents accidental writes: device powers up in EWDS state; explicit EWEN required before any erase/write - critical for field reliability. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Storing fuel trim coefficients, ignition timing maps, and fault code history across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed write integrity during battery transients. Use Value: 1M endurance and >200-year retention ensure calibration data survives 15+ year vehicle service life without degradation. | Use Scenario: Holding lens focus offset, white balance settings, and sensor calibration offsets in automotive vision systems. IC Role / Device Role / Timing Role: Configuration memory accessed during boot and runtime adjustment; supports sequential read for fast parameter loading. Use Value: 16-bit word width matches typical camera register widths, reducing byte-packing overhead and improving read efficiency. |
| Transmission Control Module (TCM) | Electric Power Steering (EPS) ECU |
Use Scenario: Recording gear shift adaptation values, clutch wear compensation, and diagnostic event logs. IC Role / Device Role / Timing Role: Robust data logger with ERAL/WRAL support for periodic full-array updates after major service events. Use Value: 6 ms write cycle and automotive temp grade allow safe operation in high-temperature transmission environments. | Use Scenario: Storing torque sensor zero-point offsets, motor phase alignment data, and safety monitor thresholds. IC Role / Device Role / Timing Role: Safety-critical configuration store requiring AEC-Q100 compliance and hardware write protection. Use Value: EWEN/EWDS gating and POR lockout prevent unintended writes during EPS power sequencing or voltage dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66BT-I/SN | Industrial temp grade (−40°C to +85°C); identical electrical specs and pinout. | Not qualified for under-hood or transmission applications requiring 125°C operation. | Select only for cabin or chassis modules operating within industrial temperature envelope. |
| AT25DF041A-SHN-T | 4 Mbit SPI NOR Flash; sector erase; no built-in ERAL/WRAL; requires external command sequencing. | Lacks auto-erase-before-write; higher density but less deterministic write timing and no hardware write disable. | Choose only if higher capacity and SPI compatibility outweigh need for guaranteed atomic WRAL and EWDS security. |
Compared with 93LC66BT-I/SN, the 93LC66BXT-E/SN adds automotive qualification and extended high-temp reliability; compared with AT25DF041A-SHN-T, it offers simpler command set, lower power, and hardware-enforced write protection - critical for functional safety contexts.
Availability
93LC66BXT-E/SN is available at Aetrix Electronics and suitable for automotive control units, ADAS camera modules, and electric power steering systems requiring stable component supply across multi-year production programs.
Supply support for 93LC66BXT-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 93LC66BXT-E/SN belongs to Microchip's legacy 93XX serial EEPROM product line, designed specifically for cost-sensitive, low-power, nonvolatile storage in automotive and industrial systems where simplicity, reliability, and AEC-Q100 compliance are essential.
FAQ
What is the memory organization of the 93LC66BXT-E/SN?
The 93LC66BXT-E/SN has a fixed 256 × 16-bit (4 Kbit) organization. It is a 'B'-suffix device, meaning it operates exclusively in x16 mode with no ORG pin - unlike 'C' variants, it does not support x8/x16 configuration via external logic. This eliminates board-level configuration complexity and ensures deterministic 16-bit data access.
Does the 93LC66BXT-E/SN require an external ORG pull-up or pull-down resistor?
No, the 93LC66BXT-E/SN does not require an external ORG resistor because it is a 'B'-version device with fixed 16-bit organization and no ORG pin functionality. The ORG terminal is internally omitted or tied off; pin 6 in the SOIC package is NC (no internal connection), as confirmed in the Pin Function Table and Package Types diagram for 93LC66B devices.
What is the minimum VCC required for ERAL and WRAL operations on the 93LC66BXT-E/SN?
The 93LC66BXT-E/SN requires VCC ≥ 4.5 V to execute ERAL (Erase All) and WRAL (Write All) commands reliably. This is explicitly specified in the datasheet (DS21795E, pages 8 and 11) and enforced by internal voltage detection circuitry - operation below this threshold will fail silently or produce undefined behavior.
How does the Ready/Busy status work on the 93LC66BXT-E/SN DO pin?
During erase or write operations, the DO pin outputs Ready/Busy status: 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 when CS is low or standby is active.
Is the 93LC66BXT-E/SN pin-compatible with the 93LC66A or 93LC66C variants?
No - the 93LC66BXT-E/SN is not pin-compatible with 93LC66A (x8) or 93LC66C (x8/x16 configurable) variants. While all share the same 8-lead SOIC (SN) footprint, the 93LC66A has no ORG pin (pin 6 = NC), the 93LC66C has ORG on pin 6, and the 93LC66B also has NC on pin 6 but differs electrically in word width, instruction timing, and address length - direct substitution would cause communication failure.
93LC66BXT-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:
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC66BXT-E/SN FAQ
1.How can I place an order for 93LC66BXT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BXT-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 93LC66BXT-E/SN reliable?
The price and inventory of 93LC66BXT-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 93LC66BXT-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC66BXT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BXT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BXT-E/SN?
93LC66BXT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BXT-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 93LC66BXT-E/SN?
For technical support, including 93LC66BXT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BXT-E/SN requirements.
6.How does Aetrix verify that 93LC66BXT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66BXT-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 93LC66BXT-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC66BXT-E/SN?
All 93LC66BXT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BXT-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 93LC66BXT-E/SN part is unused and in its original packaging.
Return procedure for 93LC66BXT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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