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Microchip Technology 93LC66BT-I/MS
- Part No.:
- 93LC66BT-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
93LC66BT-I/MS.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,804
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Product details
Overview
93LC66BT-I/MS from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, Microwire-compatible 3-wire interface (CS, CLK, DI/DO), and industrial temperature range (–40°C to +85°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 embedded system configuration storage and calibration data retention.
For engineers reviewing the 93LC66BT-I/MS datasheet, 93LC66BT-I/MS pinout, 93LC66BT-I/MS application, or 93LC66BT-I/MS equivalent, key selection criteria include VCC range (2.5–5.5 V), MSOP-8 package compatibility, Ready/Busy status signaling via DO, and absence of ORG pin (fixed x8 mode).
Technical Context
The 93LC66BT-I/MS implements a synchronous serial Microwire protocol with start-bit detection, opcode-driven instruction set (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS), and internal auto-erase-before-write logic. It operates in Standby mode when CS is low and transitions to active on CS high with valid start condition.
Memory access uses rising-edge clocked serial input (DI) and output (DO), with DO providing either data (during READ) or Ready/Busy status (during programming). The device powers up in EWDS state and requires explicit EWEN before any erase/write operation - ensuring robust data integrity in power-cycled systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit organization; no ORG pin - fixed x8 mode) |
| VCC range | 2.5 V to 5.5 V - supports wide supply rails including 3.3 V and 5 V systems |
| Endurance | 1,000,000 erase/write cycles - enables long-term field calibration updates |
| Data retention | 200 years at 25°C - suitable for lifetime nonvolatile storage without refresh |
| Write cycle time | 6 ms typical - defines minimum interval between successive write operations |
| Interface | 3-wire Microwire-compatible (CS, CLK, DI/DO) - minimal GPIO usage, no address bus required |
| Temp range | –40°C to +85°C (Industrial grade) - validated for industrial control and automotive cabin applications |
Pinout & Package
8-pin MSOP (Micro Small Outline Package), 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating), Pb-free Matte Tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held ≥250 ns low between instructions; initiates self-timed write on falling edge |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; stoppable mid-transfer; no clock required during auto-erase/write |
| 3 (DI) | Data Input | Accepts start bit, opcodes, addresses, and write data; shares net with DO in bidirectional configurations (with current-limiting resistor) |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; status readable only after ≥250 ns CS low time |
| 5 (VSS) | Ground | Reference return path; exposed pad may connect to VSS for thermal/mechanical stability |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 (ORG) | Organization select | Not present on 93LC66A/B variants - this pin is NC; fixed 8-bit mode only |
| 8 (VCC) | Power Supply | 2.5–5.5 V supply; POR threshold at 1.5 V ensures data protection during brown-out |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing circuitry; internal cycle completes in ≤6 ms without host intervention |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write - prevents partial writes and data corruption |
| Power-on/off data protection | Hardware-level lockout below 1.5 V VCC - prevents inadvertent writes during power ramp-up/down |
| Ready/Busy status on DO | Enables polling-based firmware flow control without additional pins or interrupts |
| Sequential read mode | Continuous data stream across memory addresses while CS remains high - reduces transaction overhead |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in programmable logic controllers and RTUs. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with infrequent update and guaranteed 200-year retention. Use Value: Eliminates need for battery-backed SRAM; supports recalibration in field without hardware replacement. | Use Scenario: Holding boot-time configuration flags (e.g., UART baud rate, I/O mapping, network MAC address) in microcontroller-based gateways. IC Role / Device Role / Timing Role: Serial configuration memory accessed early in boot sequence via minimal 3-wire interface. Use Value: Reduces BOM count vs parallel EEPROM; enables flexible firmware personalization without PCB redesign. |
| Automotive Body Control Module | Consumer Appliance Settings Storage |
Use Scenario: Retaining user-adjusted mirror/seat positions and lighting preferences in 12 V automotive cabins. IC Role / Device Role / Timing Role: Industrial-temp EEPROM interfaced to 3.3 V MCU over Microwire; withstands cold crank and load dump transients. Use Value: Meets AEC-Q100 stress requirements indirectly via industrial temp grade and robust VCC lockout. | Use Scenario: Saving cooking modes, timer presets, and language selections in smart ovens and washing machines. IC Role / Device Role / Timing Role: Low-power serial memory powered from standby rail; accessed only during UI interaction or power-up. Use Value: Achieves <1 µA standby current - extends battery life in cordless remotes and backup clocks. |
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/MS | 16-bit organization (256 × 16), same VCC/temp/package - requires ORG = VCC or dedicated 16-bit host interface | Used where wider data path reduces transaction count (e.g., storing 16-bit ADC calibration words) | Select only if host firmware and hardware support x16 addressing and data framing |
| AT25040B-MAHL-T | SPI interface (4-wire), same density (4 Kbit), 1.8–5.5 V, SOIC-8/MSOP-8 - lacks ERAL/WRAL but adds write protect pin | Preferred in SPI-native designs; requires separate WP pin management instead of EWEN/EWDS command flow | Choose when migrating from legacy Microwire to standardized SPI infrastructure |
Compared with 93LC66B-I/MS, the 93LC66BT-I/MS offers simpler x8 timing and eliminates ORG routing; versus AT25040B-MAHL-T, it retains Microwire compatibility and integrated ERAL/WRAL but lacks hardware write protection.
Availability
93LC66BT-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for 93LC66BT-I/MS 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 devices, 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-sensitive, low-pin-count embedded systems requiring reliable nonvolatile storage with minimal external components.
FAQ
What is the memory organization of the 93LC66BT-I/MS?
The 93LC66BT-I/MS is a fixed 512 × 8-bit (4 Kbit) device - it belongs to the 'A' variant family and has no functional ORG pin. Pin 7 (labeled ORG on MSOP-8) is internally unconnected (NC), confirming x8-only operation. This differs from 'C' variants which use ORG to switch between x8/x16 modes.
Does the 93LC66BT-I/MS support automatic erase before write?
Yes, the 93LC66BT-I/MS performs automatic erase before each WRITE or WRAL operation - no separate ERASE command is needed. This self-timed behavior is inherent to the device architecture and occurs internally during the 6 ms write cycle, ensuring data consistency without host software intervention.
What is the function of the DO pin during programming on the 93LC66BT-I/MS?
During erase or write cycles, the DO pin of the 93LC66BT-I/MS 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 the initial CS low period - DO reverts to High-Z if CS remains low throughout the cycle.
Is an EWEN command required before every write operation on the 93LC66BT-I/MS?
Yes - the 93LC66BT-I/MS powers up in Erase/Write Disable (EWDS) mode. An EWEN command must precede the first WRITE, ERASE, WRAL, or ERAL instruction in each power cycle. Subsequent writes within the same power session do not require repeated EWEN unless an EWDS is issued in between.
What package type does the 93LC66BT-I/MS use, and what are its key mechanical dimensions?
The 93LC66BT-I/MS uses an 8-pin MSOP (Micro Small Outline Package) with 3.0 mm × 3.0 mm body, 0.65 mm lead pitch, and JEDEC-standard footprint. Pin 1 is marked by laser dot; the exposed thermal pad (if present) is optional and may be connected to VSS or left floating per PCB thermal requirements.
93LC66BT-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
93LC66BT-I/MS FAQ
1.How can I place an order for 93LC66BT-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BT-I/MS 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-I/MS reliable?
The price and inventory of 93LC66BT-I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66BT-I/MS is usually 5 days.
3.What payment methods are accepted for 93LC66BT-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BT-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BT-I/MS?
93LC66BT-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BT-I/MS 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-I/MS?
For technical support, including 93LC66BT-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BT-I/MS requirements.
6.How does Aetrix verify that 93LC66BT-I/MS is sourced from the original manufacturer or authorized distributors?
All 93LC66BT-I/MS 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-I/MS meets industry standards.
7.What is the process for return or replacement of 93LC66BT-I/MS?
All 93LC66BT-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BT-I/MS, 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-I/MS part is unused and in its original packaging.
Return procedure for 93LC66BT-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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