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Microchip Technology 93LC66BT/SN
- Part No.:
- 93LC66BT/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66BT/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,985
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Product details
Overview
93LC66BT/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 and calibration data retention.
For engineers reviewing the 93LC66BT/SN datasheet, 93LC66BT/SN pinout, 93LC66BT/SN application, or 93LC66BT/SN equivalent, key selection criteria include VCC range (2.5–5.5 V), absence of ORG pin (fixed 8-bit mode), SOIC-8 package compatibility, and Ready/Busy status via DO pin during programming.
Technical Context
The 93LC66BT/SN implements a synchronous serial Microwire protocol with start-bit detection, opcode-driven instruction set (READ/WRITE/ERASE/ERAL/WRAL/EWEN/EWDS), and clock-synchronized data transfer on rising CLK edges. All operations require CS high for initiation and support sequential read without readdressing.
It uses internal auto-erase-before-write logic and includes hardware-level data protection: POR/VCC detect (1.5 V threshold), EWEN/EWDS lockout states, and standby current as low as 1 µA. The device lacks ORG pin functionality - confirming fixed x8 organization per Device Selection Table and Pin Function Table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit) - fixed x8 organization; no ORG pin; supports byte-level addressing |
| VCC range | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V systems; POR threshold at 1.5 V prevents corruption during brown-out |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - no SPI mode; requires start bit and opcode decoding |
| Write cycle time | 6 ms typical - self-timed; includes auto-erase; enables deterministic firmware timing control |
| Endurance | 1,000,000 erase/write cycles - validated at 25°C, 5.0 V; supports long-life field calibration updates |
| Data retention | >200 years - ensures nonvolatile storage integrity across product lifecycle without refresh |
| Temp range | –40°C to +85°C (Industrial grade) - qualified for industrial control, metering, and automotive body electronics |
Pinout & Package
Package: 8-lead SOIC (SN suffix per Microchip packaging nomenclature; matches "SN" in part number 93LC66BT/SN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| DI | Data Input | Receives start bit, opcodes, addresses, and write data; shares no internal bus with DO |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge |
| VSS | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection |
| NC | No Connect | Pin 7 in SOIC-8; internally unconnected; must be left floating or tied to VSS per layout best practice |
| VCC | Power Supply | 2.5–5.5 V supply; powers internal logic and charge pump; POR circuit triggers below 1.5 V |
| ORG | Organization Select | Not present on 93LC66B devices - pin 6 is NC; fixed 8-bit mode confirmed by Device Selection Table |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing components; 6 ms max cycle time enables predictable firmware state management |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; prevents partial writes and data corruption |
| Ready/Busy status on DO | Enables polling-based operation without interrupt or timeout loops; reduces CPU overhead in resource-constrained systems |
| Power-on/off data protection | VCC detect (1.5 V) blocks writes during power ramp; prevents inadvertent writes during supply instability |
| EWEN/EWDS security lock | Hardware-enforced write disable after power-up; requires explicit EWEN before any programming - critical for field reliability |
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 configuration memory holding calibration constants accessed at boot and updated during maintenance. Use Value: 200+ year data retention ensures accuracy over equipment lifetime; 1M endurance supports recalibration every 6 months for 20+ years. | Use Scenario: Retaining user-defined settings (network IP, display contrast, alarm thresholds) in medical infusion pumps and diagnostic instruments. IC Role / Device Role / Timing Role: Serial configuration store interfaced to MCU GPIOs; accessed via Microwire protocol during initialization. Use Value: Low 1 µA standby current extends battery life in portable devices; 2.5 V minimum VCC supports single-cell Li-ion backup operation. |
| Automotive Body Control Module | Smart Energy Metering |
Use Scenario: Saving seat/mirror position memory and lighting profiles in 12 V automotive BCMs operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced to 8-bit/16-bit microcontrollers; withstands load-dump transients via robust ESD (≥4 kV). Use Value: Qualified for industrial temp range - meets AEC-Q100 stress requirements when used with external TVS; SOIC-8 simplifies PCB routing in space-constrained modules. | Use Scenario: Storing tariff schedules, billing history, and tamper logs in ANSI C12.22-compliant smart meters deployed in utility substations. IC Role / Device Role / Timing Role: Secure, long-life data logger memory; accessed during meter firmware updates and periodic data uploads. Use Value: Pb-free/RoHS compliance satisfies global utility procurement mandates; 512 × 8-bit layout aligns with standard meter register maps for efficient firmware integration. |
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 | Same 512 × 8-bit organization, SOIC-8, industrial temp; identical electrical specs and pinout | No functional difference - "T" suffix denotes tape-and-reel packaging; "I" suffix is redundant since SN implies industrial grade | Select 93LC66B-I/SN only if legacy BOM specifies "I"; 93LC66BT/SN is functionally identical and preferred for new designs |
| AT25040B-MAU-T | SPI interface (4-wire), 512 × 8-bit, 1.8–5.5 V, SOIC-8; no Ready/Busy pin - relies on WIP flag polling | Requires SPI peripheral instead of GPIO-bit-banged Microwire; lacks DO-based status signal - increases firmware complexity | Choose only if existing design already uses SPI peripherals and firmware supports flag polling; not drop-in compatible due to protocol and pinout differences |
Compared with 93LC66B-I/SN, the 93LC66BT/SN offers identical functionality with optimized packaging logistics; versus AT25040B-MAU-T, it provides simpler timing control via DO status but requires Microwire-specific driver implementation.
Availability
93LC66BT/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and smart energy metering requiring stable component supply across extended product lifecycles.
Supply support for 93LC66BT/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 microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, serving industrial, automotive, and consumer markets globally.
The 93LC66 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power, nonvolatile memory applications where Microwire compatibility, robust data retention, and industrial temperature operation are essential.
FAQ
What is the memory organization of the 93LC66BT/SN?
The 93LC66BT/SN has a fixed 512 × 8-bit (4 Kbit) organization. As a 'B'-suffix device in the 93LC66 family, it does not include an ORG pin and operates exclusively in x8 mode - confirmed by the Device Selection Table and Pin Function Table in DS21795E. This eliminates configuration ambiguity during system integration.
Does the 93LC66BT/SN support 16-bit word access?
No, the 93LC66BT/SN does not support 16-bit word access. It is a dedicated 8-bit device ('B' variant), with no ORG pin and no x16 instruction set. Only 93LC66C variants support selectable x8/x16 mode via the ORG pin; the 93LC66BT/SN uses only the x8 instruction set defined in Table 1-4 of DS21795E.
What is the purpose of the NC pin on the 93LC66BT/SN SOIC-8 package?
Pin 7 of the 93LC66BT/SN in SOIC-8 is marked NC (No Connection) per Microchip's Pin Function Table. It is internally unconnected and must be left floating or tied to VSS per PCB layout guidelines. This differs from pin 6 (ORG), which is also NC on 'A'/'B' devices but appears in the pinout diagram as a dedicated terminal - pin 7 has no internal bond wire.
How does the Ready/Busy status work on the 93LC66BT/SN?
The 93LC66BT/SN asserts Ready/Busy status on the DO pin: logic low indicates active erase/write, 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. This enables efficient polling without external timers or interrupts.
Is the 93LC66BT/SN RoHS compliant and lead-free?
Yes, the 93LC66BT/SN is Pb-free and RoHS compliant, as explicitly stated in the Features section of DS21795E. The "SN" package suffix denotes 8-lead SOIC with Matte Tin (Sn) finish, meeting JEDEC J-STD-609 Category 1 requirements. Full compliance documentation is available in Microchip's official packaging specification.
93LC66BT/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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC66BT/SN FAQ
1.How can I place an order for 93LC66BT/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BT/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/SN reliable?
The price and inventory of 93LC66BT/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/SN is usually 5 days.
3.What payment methods are accepted for 93LC66BT/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BT/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BT/SN?
93LC66BT/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BT/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/SN?
For technical support, including 93LC66BT/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BT/SN requirements.
6.How does Aetrix verify that 93LC66BT/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66BT/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/SN meets industry standards.
7.What is the process for return or replacement of 93LC66BT/SN?
All 93LC66BT/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BT/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/SN part is unused and in its original packaging.
Return procedure for 93LC66BT/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC66BT/SN Tags
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