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Microchip Technology 93LC66BX-I/SN
- Part No.:
- 93LC66BX-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66BX-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,574
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Product details
Overview
93LC66BX-I/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, operating across 2.5–5.5 V, supporting Industrial temperature range (−40°C to +85°C), and featuring Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO) for embedded configuration storage in microcontroller systems.
For engineers reviewing the 93LC66BX-I/SN datasheet, 93LC66BX-I/SN pinout, 93LC66BX-I/SN application, or 93LC66BX-I/SN equivalent, key selection criteria include VCC range compatibility, 8-bit word size (no ORG pin), self-timed erase/write cycles, Ready/Busy status signaling via DO, and Pb-free SOIC-8 packaging.
Technical Context
This device implements a synchronous serial Microwire interface with start-bit detection, opcode-driven command set (READ/WRITE/ERASE/ERAL/WRAL/EWEN/EWDS), and hardware-based power-on/off data protection. It uses internal auto-erase before write and supports sequential read without reissuing address.
Memory access is controlled by CS-active-high selection, rising-edge clocked DI input, and DO output that toggles between High-Z, data, and Ready/Busy states depending on operation mode. The ORG pin is NC (not connected) on this 'B'-suffixed variant - confirming fixed 8-bit organization per the Device Selection Table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit), providing compact nonvolatile storage for calibration data, device IDs, or user settings. |
| VCC Range | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level shifting. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage, no SPI mode bits required. |
| Write Cycle Time | 6 ms typical - enables predictable timing budgeting for firmware write routines. |
| Endurance | 1,000,000 erase/write cycles - suitable for field-updatable parameters with frequent reprogramming. |
| Data Retention | 200 years at 25°C - ensures long-term reliability in unpowered storage applications. |
| Temp Range | −40°C to +85°C (Industrial grade) - validated for industrial control, metering, and automotive body electronics. |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free Matte Tin finish, 150-mil width, standard JEDEC MS-012AC footprint.
| 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; supports up to 3 MHz at VCC ≥4.5 V; stoppable mid-transfer. |
| 3 - DI | Data Input | Accepts start bit, opcodes, addresses, and write data; requires pull-down if unused. |
| 4 - DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS fall; requires external pull-up. |
| 5 - VSS | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection. |
| 6 - NC | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice. |
| 7 - NC | No Connect | Same as Pin 6; not bonded; no electrical function. |
| 8 - VCC | Power Supply | Supplies core and I/O; includes internal POR circuit triggering at ~1.5 V for 'LC' devices. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control or firmware delay loops - cycle completion signaled via DO pin. |
| Automatic ERAL before WRAL | Ensures full-array write integrity without separate erase command - reduces firmware complexity and risk of partial writes. |
| Power-On/Off Data Protection | Hardware lockout below VCC threshold (~1.5 V) prevents corruption during brown-out or hot-plug events. |
| Ready/Busy Status on DO | Enables polling-based write synchronization without interrupt or timer overhead - simplifies RTOS and bare-metal drivers. |
| Pb-free & RoHS Compliant | Meets global environmental compliance requirements for industrial and consumer product certifications. |
Applications
| Smart Energy Meters | Industrial PLC Modules |
|---|---|
Use Scenario: Storing tariff tables, meter calibration coefficients, and tamper-event logs across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced to MCU via Microwire; accessed infrequently but requiring guaranteed retention. Use Value: 200-year data retention and 1M endurance ensure lifetime validity without battery backup or refresh routines. | Use Scenario: Holding I/O mapping definitions, firmware update flags, and hardware revision identifiers in modular controllers. IC Role / Device Role / Timing Role: Serial EEPROM acting as persistent parameter store; accessed during boot and runtime configuration changes. Use Value: 2.5–5.5 V operation matches wide-input industrial power rails; SOIC-8 allows drop-in replacement in legacy designs. |
| Automotive Body Control Units | Medical Diagnostic Devices |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and diagnostic trouble code history in 12 V systems. IC Role / Device Role / Timing Role: Low-power serial memory co-located with microcontroller; powered from regulated 3.3 V or 5 V rail. Use Value: −40°C to +85°C rating covers under-hood and cabin environments; 3-wire interface minimizes PCB routing complexity. | Use Scenario: Storing sensor calibration offsets, user preferences, and regulatory audit trails in portable diagnostic tools. IC Role / Device Role / Timing Role: Trusted nonvolatile memory for safety-critical configuration data; accessed only during initialization or service mode. Use Value: Hardware write-protection (EWEN/EWDS) prevents accidental overwrites; RoHS compliance supports medical device certifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66A-I/SN | Identical 512 × 8-bit organization, same VCC range (2.5–5.5 V), identical SOIC-8 package and pinout. | No functional difference; 'A' and 'BX' variants are functionally equivalent per Microchip documentation. | Select 93LC66A-I/SN if sourcing flexibility or dual-sourcing is required - fully interchangeable in design and firmware. |
| AT25040B-MAHL-T | SPI interface (4-wire), 512 × 8-bit, 1.8–5.5 V, 20 MHz max clock, different command set and status register model. | Requires SPI driver adaptation; lacks native Ready/Busy pin - relies on WIP bit polling via STATUS register. | Choose only if migrating to SPI-based architecture; not pin- or firmware-compatible with 93LC66BX-I/SN. |
Compared with 93LC66A-I/SN, the 93LC66BX-I/SN offers identical functionality and drop-in compatibility; versus AT25040B-MAHL-T, it retains Microwire simplicity and direct DO-status signaling but requires interface-specific firmware support.
Availability
93LC66BX-I/SN is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC modules, and automotive body control units requiring stable component supply, long-life data retention, and RoHS-compliant packaging.
Supply support for 93LC66BX-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, serving industrial, automotive, and consumer markets globally.
The 93LC66BX-I/SN belongs to Microchip's legacy 93XX series of Microwire-compatible serial EEPROMs, designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable nonvolatile storage with minimal MCU resource usage.
FAQ
What is the memory organization of the 93LC66BX-I/SN?
The 93LC66BX-I/SN is a 512 × 8-bit (4 Kbit) device with fixed 8-bit word size. Unlike 'C' variants, it has no ORG pin - the 'B' suffix confirms dedicated 8-bit organization per Microchip's Device Selection Table, eliminating configuration ambiguity during system integration.
Does the 93LC66BX-I/SN require an external pull-up resistor on the DO pin?
Yes, the 93LC66BX-I/SN requires an external pull-up resistor on the DO pin to ensure valid logic-high levels during Read and Ready/Busy status reporting. The DO pin operates in open-drain mode and defaults to High-Z when inactive; typical values range from 4.7 kΩ to 10 kΩ to VCC.
How does write protection work on the 93LC66BX-I/SN?
The 93LC66BX-I/SN powers up in Erase/Write Disable (EWDS) mode. An Erase/Write Enable (EWEN) instruction must precede any WRITE, ERASE, or WRAL command. After programming, issuing EWDS restores protection - preventing accidental overwrites during noise events or power transients.
What is the maximum clock frequency supported by the 93LC66BX-I/SN?
The 93LC66BX-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. These limits are specified in Table 1-2 AC Characteristics and apply to both read and write command sequences.
Is the 93LC66BX-I/SN pin-compatible with other 93XX66 variants in SOIC-8 package?
Yes - the 93LC66BX-I/SN shares identical SOIC-8 pinout (SN package) with all 93XX66A/B/C variants in PDIP/SOIC/TSSOP/MSOP packages per Pin Function Table. However, functional compatibility depends on organization (8-bit vs 16-bit) and ORG pin presence; 'A' and 'B' variants are pin- and functionally identical.
93LC66BX-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
93LC66BX-I/SN FAQ
1.How can I place an order for 93LC66BX-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BX-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 93LC66BX-I/SN reliable?
The price and inventory of 93LC66BX-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 93LC66BX-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC66BX-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BX-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BX-I/SN?
93LC66BX-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BX-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 93LC66BX-I/SN?
For technical support, including 93LC66BX-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BX-I/SN requirements.
6.How does Aetrix verify that 93LC66BX-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66BX-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 93LC66BX-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC66BX-I/SN?
All 93LC66BX-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BX-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 93LC66BX-I/SN part is unused and in its original packaging.
Return procedure for 93LC66BX-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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