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Microchip Technology 93LC66BXT-I/SN
- Part No.:
- 93LC66BXT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66BXT-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,411
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Product details
Overview
93LC66BXT-I/SN from Microchip Technology Inc. is a 4 Kbit, 256 × 16-bit organization serial EEPROM with Microwire-compatible 3-wire interface, operating over 2.5–5.5 V supply and rated for -40°C to +85°C industrial temperature range. It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO pin - used in embedded system configuration storage, sensor calibration data retention, and industrial controller parameter backup.
For engineers reviewing the 93LC66BXT-I/SN datasheet, 93LC66BXT-I/SN pinout, 93LC66BXT-I/SN application, or 93LC66BXT-I/SN equivalent, key selection criteria include guaranteed 16-bit word access (no ORG pin required), 6 ms typical write cycle time, 1 million endurance cycles, >200-year data retention, and compatibility with low-voltage microcontroller I/O domains.
Technical Context
The 93LC66BXT-I/SN implements a fixed 256 × 16-bit memory array accessed via synchronous 3-wire serial protocol (CS, CLK, DI/DO). All instructions - READ, WRITE, ERASE, ERAL, WRAL, EWEN, EWDS - are initiated by a Start bit followed by opcode, address, and data fields clocked on rising CLK edges. The device operates in Standby mode when CS is low, drawing only 1 µA typical ICCS.
Unlike C-variant parts, the 'B' version has no ORG pin and permanently configures for 16-bit word operation. Data output toggles on CLK rising edge with TPD ≤ 400 ns at 1.8 V, and Ready/Busy status is sampled by polling DO after CS high assertion following minimum TCSL (250 ns). Write operations auto-erase target locations prior to programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (256 × 16-bit) - supports compact 16-bit MCU register mapping without software bit-packing. |
| VCC range | 2.5 V to 5.5 V - interoperable with 3.3 V and 5 V logic families and tolerant of brown-out conditions down to 1.5 V POR threshold. |
| Write cycle time | 6 ms max (TWC) - enables deterministic firmware timeout handling for non-blocking EEPROM writes. |
| Endurance | 1,000,000 erase/write cycles - suitable for logging applications with daily updates over 27+ years. |
| Data retention | >200 years at 25°C - ensures long-term reliability in unpowered storage for calibration constants or security keys. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - requires only four MCU GPIOs and no external level shifters at 3.3 V. |
| Temp range | -40°C to +85°C (Industrial grade) - validated for deployment in factory automation, HVAC, and metering equipment. |
Pinout & Package
93LC66BXT-I/SN is packaged in an 8-lead SOIC (SN) with 150 mil width, RoHS-compliant matte tin finish, and standard pinout compatible with industry-wide PCB footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between commands; initiates self-timed write on falling edge. |
| CLK | Serial Clock | Synchronizes all data transfers on rising edge; supports stop/start mid-sequence; no clock required during write cycle. |
| DI | Data Input | Accepts Start bit, opcodes, addresses, and write data; tied high with pull-up for Start detection. |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS low or during non-read states. |
| VSS | Ground | Reference return path for all I/O and internal circuitry; must be low-impedance connection. |
| NC | No Connection | Pin 7 is unconnected internally; may be left floating or grounded per layout best practice. |
| VCC | Power Supply | Supplies core logic and memory array; bypass capacitor (0.1 µF) required within 10 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or firmware delay loops - write completion signaled via DO pin polling. |
| Automatic ERAL before WRAL | Guarantees full-array erase prior to bulk write, preventing stale data corruption without host software intervention. |
| Power-on/off data protection | Hardware-level lockout below 1.5 V VCC prevents spurious writes during power ramp-up/down or brownout events. |
| Ready/Busy status signaling | Enables efficient polling-based write flow control without interrupt or timer overhead in resource-constrained MCUs. |
| 16-bit dedicated organization | Fixed x16 architecture simplifies driver code - no runtime ORG pin management or dual-mode addressing logic required. |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with guaranteed 16-bit word access aligned to ADC register width. Use Value: Eliminates recalibration after power loss; 1M endurance supports field re-trimming up to daily for 27+ years. | Use Scenario: Retaining user-configurable settings (baud rate, network ID, alarm thresholds) in smart energy meters. IC Role / Device Role / Timing Role: Serial configuration memory interfaced directly to 8/16-bit MCU GPIOs with minimal BOM count. Use Value: 2.5–5.5 V operation matches meter's wide-input DC-DC output; >200-year retention ensures lifetime data integrity. |
| Automotive Subsystem Logging | Medical Device Parameter Backup |
Use Scenario: Recording fault codes and operational timestamps in body control modules (BCM) compliant with AEC-Q100 Class 2 temp range. IC Role / Device Role / Timing Role: Industrial-grade EEPROM deployed in automotive-qualified systems where extended temperature support is verified. Use Value: Validated -40°C to +85°C operation meets under-hood ambient requirements; 6 ms write time enables fast fault capture. | Use Scenario: Preserving critical calibration and safety-critical configuration data in portable infusion pumps. IC Role / Device Role / Timing Role: Certified-reliability nonvolatile memory storing FDA-mandated device parameters with traceable write history. Use Value: 1M endurance and >200-year retention satisfy ISO 13485 data integrity requirements for Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66AXT-I/SN | 8-bit organization (512 × 8), same VCC range and package; lacks 16-bit native access. | Requires byte-aligned MCU drivers; less efficient for 16-bit register storage. | Select when legacy 8-bit bus alignment or backward compatibility with older 93LC66A designs is required. |
| AT25040B-MAHL-T | SPI interface (4-wire), 512 × 8-bit, 1.8–5.5 V, 5 ms write time; no Ready/Busy pin - uses WIP flag in status register. | Requires SPI peripheral instead of GPIO-bitbanged Microwire; different command set and polling mechanism. | Select when existing design uses SPI peripherals and higher write speed is prioritized over pin count minimization. |
Compared with 93LC66AXT-I/SN, the 93LC66BXT-I/SN delivers native 16-bit word efficiency and eliminates software bit-manipulation overhead; versus AT25040B-MAHL-T, it reduces MCU pin count by one and provides direct hardware-ready/busy signaling without status register reads.
Availability
93LC66BXT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and medical device parameter backup requiring stable component supply across multi-year production lifecycles.
Supply support for 93LC66BXT-I/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-I/SN belongs to Microchip's legacy 93XX serial EEPROM product line, engineered for ultra-low-power, high-reliability nonvolatile storage in space-constrained embedded systems with minimal MCU resource usage.
FAQ
What is the memory organization of the 93LC66BXT-I/SN?
The 93LC66BXT-I/SN has a fixed 256 × 16-bit organization - meaning it stores 256 words of 16 bits each, totaling 4 Kbit. Unlike 'C' variants, it does not have an ORG pin; its 16-bit word structure is hardwired, eliminating configuration overhead. This makes the 93LC66BXT-I/SN ideal for applications requiring aligned 16-bit data storage without runtime pin management.
Does the 93LC66BXT-I/SN require an external ORG pin connection?
No, the 93LC66BXT-I/SN does not require or support an ORG pin. Pin 6 is marked NC (No Connection) in the SOIC package, as the 'B' variant is permanently configured for 16-bit operation. This differs from 'C' versions, which use ORG to select between 8-bit and 16-bit modes. The 93LC66BXT-I/SN simplifies layout and firmware by removing this dependency entirely.
What is the maximum clock frequency supported by the 93LC66BXT-I/SN?
The 93LC66BXT-I/SN supports up to 3 MHz clock frequency when VCC is 4.5–5.5 V, 2 MHz at 2.5–4.5 V, and 1 MHz at 1.8–2.5 V. Since the 93LC66BXT-I/SN operates from 2.5 V minimum, its practical maximum is 2 MHz in its specified voltage range. This allows reliable communication with most 8/16-bit MCUs while maintaining timing margin across temperature and voltage extremes.
How does the Ready/Busy function work on the 93LC66BXT-I/SN?
The DO pin of the 93LC66BXT-I/SN serves dual purpose: data output during READ and Ready/Busy status during erase/write. After initiating a WRITE or ERASE, bring CS high for ≥250 ns, then sample DO - low indicates ongoing operation, high means complete. Issuing a Start bit then lowering CS clears the status. This hardware signaling avoids software timers or fixed delays in the 93LC66BXT-I/SN's firmware interface.
Is the 93LC66BXT-I/SN compatible with 3.3 V microcontrollers?
Yes, the 93LC66BXT-I/SN is fully compatible with 3.3 V microcontrollers. Its VCC range is 2.5–5.5 V, and its input thresholds (VIH1 = 2.0 V min, VIL1 = 0.8 V max at VCC ≥ 2.7 V) ensure robust logic-level recognition. Output drive strength (VOH1 ≥ 2.4 V at 4.5 V, VOL1 ≤ 0.4 V) meets 3.3 V CMOS requirements. No level shifting is needed when interfacing the 93LC66BXT-I/SN with standard 3.3 V MCUs.
93LC66BXT-I/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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC66BXT-I/SN FAQ
1.How can I place an order for 93LC66BXT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BXT-I/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-I/SN reliable?
The price and inventory of 93LC66BXT-I/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-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC66BXT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BXT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BXT-I/SN?
93LC66BXT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BXT-I/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-I/SN?
For technical support, including 93LC66BXT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BXT-I/SN requirements.
6.How does Aetrix verify that 93LC66BXT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66BXT-I/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-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC66BXT-I/SN?
All 93LC66BXT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BXT-I/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-I/SN part is unused and in its original packaging.
Return procedure for 93LC66BXT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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