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Microchip Technology 93LC66BT-I/SN
- Part No.:
- 93LC66BT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66BT-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,993
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Product details
Overview
93LC66BT-I/SN 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, sensor calibration data retention, and firmware parameter backup.
For engineers reviewing the 93LC66BT-I/SN datasheet, 93LC66BT-I/SN pinout, 93LC66BT-I/SN application, or 93LC66BT-I/SN equivalent, key selection criteria include VCC range (2.5–5.5 V), SOIC-8 package compatibility, 8-bit word size (no ORG pin), Ready/Busy status signaling via DO, and support for sequential read and WRAL/ERAL operations.
Technical Context
The 93LC66BT-I/SN 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. Its memory array is organized as 512 words × 8 bits, fixed by absence of ORG pin functionality - distinguishing it from 'C' variants.
Timing is governed by external CLK (up to 3 MHz at VCC ≥ 4.5 V), with CS-controlled device enable and DO-driven Ready/Busy polling. Power management includes <1 µA standby current (I-temp), POR threshold at 1.5 V, and built-in write-protection via EWEN/EWDS command sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit) - fixed x8 organization; no ORG pin required or functional. |
| VCC Range | 2.5 V to 5.5 V - supports wide supply margin across 3.3 V and 5 V systems. |
| Interface | 3-wire Microwire (CS/CLK/DI/DO) - compatible with legacy microcontroller SPI peripherals using bit-banged software control. |
| Write Cycle Time | 6 ms typical - self-timed; eliminates need for external timing control during programming. |
| Endurance | 1,000,000 erase/write cycles - enables long-term field reconfiguration in industrial controllers. |
| Data Retention | 200 years at 25°C - ensures nonvolatile storage integrity over product lifecycle without refresh. |
| Temperature Range | –40°C to +85°C (Industrial grade) - qualified for use in automotive body electronics and factory automation. |
Pinout & Package
93LC66BT-I/SN is housed in an 8-lead SOIC package (SN suffix), with standard pinout matching industry-wide Microwire EEPROM footprints. Pin 1 is CS, Pin 2 is CLK, Pin 3 is DI, Pin 4 is DO, Pin 5 is VSS, Pin 6 is NC (no internal connection), Pin 7 is NC, and Pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge. |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; stoppable mid-sequence. |
| DI (Pin 3) | Data Input | Receives start bit, instruction opcodes, address bits, and write data; requires pull-up for reliable start detection. |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low or during standby. |
| VSS (Pin 5) | Ground | Reference for all I/O and internal circuitry; must be connected directly to system ground plane. |
| NC (Pin 6) | No Connection | Internally unconnected; may be left floating or tied to ground per PCB layout best practices. |
| NC (Pin 7) | No Connection | Internally unconnected; no electrical function; routing flexibility for trace clearance or thermal relief. |
| VCC (Pin 8) | Power Supply | Supplies core logic and memory array; POR circuit activates below 1.5 V to inhibit writes during brown-out. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing circuitry; internal state machine manages erase-before-write and completion signaling via DO. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; prevents partial-write corruption without host software intervention. |
| Power-On/Off Data Protection | Hardware POR circuit disables writes when VCC < 1.5 V; prevents inadvertent data loss during power ramp-up/down. |
| Ready/Busy Status Signal | DO pin doubles as status indicator - allows polling instead of fixed delays, optimizing system response time. |
| Sequential Read Function | Enables continuous address incrementing while CS remains high - reduces transaction overhead for block reads. |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot; retains values across power cycles and temperature extremes. Use Value: Enables one-time calibration at manufacturing, eliminating recalibration in field deployment and reducing BOM cost vs. external trim pots. | Use Scenario: Holding user-configurable settings (e.g., mirror fold/unfold preference, lighting intensity profiles) in vehicle door modules. IC Role / Device Role / Timing Role: Low-power serial EEPROM interfaced to 8-bit MCU via GPIO bit-banged Microwire; accessed infrequently but reliably. Use Value: Survives 15+ year automotive service life with >200-year data retention and 1M-cycle endurance for occasional updates. |
| Medical Device Parameter Storage | Smart Energy Meter Firmware Settings |
Use Scenario: Saving operational thresholds (e.g., alarm limits, dose counters) in portable infusion pumps requiring regulatory-compliant data integrity. IC Role / Device Role / Timing Role: Secure configuration store with hardware write-protection (EWEN/EWDS); accessed only during setup or maintenance mode. Use Value: Meets IEC 62304 safety requirements via deterministic write disable and POR lockout during undervoltage. | Use Scenario: Storing tariff schedules, meter ID, and communication parameters in ANSI C12.19-compliant utility meters deployed in remote substations. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory with industrial temp rating and Pb-free RoHS compliance for outdoor enclosures. Use Value: Ensures firmware configuration persistence through wide ambient swings (–40°C to +85°C) and 10+ year field deployment without refresh. |
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 | 16-bit organization (256 × 16), same VCC and timing; ORG pin absent but internally fixed x16. | Requires host firmware adaptation for 16-bit word access; incompatible with existing 8-bit read/write routines. | Select only if system architecture mandates 16-bit data path alignment and memory bandwidth optimization. |
| AT25040B-MAHL-T | 4 Kbit SPI interface (4-wire), 1.8–5.5 V, 20 MHz max clock; no ERAL/WRAL; uses WREN/WRDI for write enable. | Lacks Microwire compatibility and auto-ERAL; requires different command protocol and timing handling. | Choose when migrating to SPI-based platforms or needing higher clock speed; verify firmware rewrite effort for command set differences. |
Compared with 93LC66B-I/SN and AT25040B-MAHL-T, the 93LC66BT-I/SN offers native 8-bit Microwire compatibility, guaranteed ERAL-before-WRAL behavior, and seamless integration into legacy 8-bit MCU designs without protocol translation or timing redesign.
Availability
93LC66BT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, and medical device parameter storage requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 93LC66BT-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 93LC66 series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, low-power embedded systems requiring simple 3-wire nonvolatile storage with robust data integrity and industrial-grade reliability.
FAQ
What is the memory organization of the 93LC66BT-I/SN?
The 93LC66BT-I/SN has a fixed 512 × 8-bit (4 Kbit) organization. It is an 'A'-type variant, meaning it does not include or require the ORG pin - unlike 'C' versions, which use ORG to select between x8/x16 modes. This simplifies PCB layout and firmware design for 8-bit data paths.
Does the 93LC66BT-I/SN support automatic erase before write?
Yes, the 93LC66BT-I/SN implements self-timed auto-erase before write. When a WRITE or WRAL command is issued, the device automatically erases the target location(s) prior to programming. This behavior is hardware-enforced and requires no host intervention - confirmed in DS21795E Section 2.8 and Table 1-2 TWC specification.
What is the purpose of the NC pins on the 93LC66BT-I/SN SOIC package?
Pins 6 and 7 on the 93LC66BT-I/SN are designated NC (No Connection) - they have no internal connection and serve no electrical function. Per Microchip DS21795E-page 12 Pin Function Table, these pins may be left floating or grounded for mechanical stability; neither affects device operation or timing.
How does the Ready/Busy status work on the 93LC66BT-I/SN?
The DO pin of the 93LC66BT-I/SN serves dual function: data output during READ, and Ready/Busy status during erase/write. After initiating WRITE/ERASE/WRAL/ERAL, bring CS high ≥250 ns after falling edge, then sample DO - low indicates ongoing operation, high confirms completion. This polling mechanism replaces fixed delay loops.
Is the 93LC66BT-I/SN compatible with standard SOIC-8 footprints?
Yes, the 93LC66BT-I/SN uses the industry-standard 150-mil SOIC-8 package (SN suffix), with 1.27 mm pitch and defined land pattern per JEDEC MS-012. Pin 1 marking (laser dot or notch) aligns with Microchip's SOIC drawings in DS21795E-page 24, ensuring drop-in compatibility with existing PCB layouts.
93LC66BT-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
93LC66BT-I/SN FAQ
1.How can I place an order for 93LC66BT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BT-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 93LC66BT-I/SN reliable?
The price and inventory of 93LC66BT-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 93LC66BT-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC66BT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BT-I/SN?
93LC66BT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BT-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 93LC66BT-I/SN?
For technical support, including 93LC66BT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BT-I/SN requirements.
6.How does Aetrix verify that 93LC66BT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66BT-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 93LC66BT-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC66BT-I/SN?
All 93LC66BT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BT-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 93LC66BT-I/SN part is unused and in its original packaging.
Return procedure for 93LC66BT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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