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Microchip Technology 93LC66X-I/SN
- Part No.:
- 93LC66X-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66X-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,956
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Product details
Overview
93LC66X-I/SN from Microchip Technology Inc. is a 4 Kbit serial EEPROM with configurable x8/x16 organization via the ORG pin, operating from 2.5V to 5.5V, featuring Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), self-timed erase/write cycles, and industrial temperature range (–40°C to +85°C). It delivers 1 million endurance cycles and >200 years data retention for nonvolatile parameter storage in embedded control systems.
For engineers reviewing the 93LC66X-I/SN datasheet, 93LC66X-I/SN pinout, 93LC66X-I/SN application, or 93LC66X-I/SN equivalent, this page provides verified functional identity, validated pin roles, confirmed memory architecture (512×8 or 256×16), real-world timing constraints (e.g., 4 ms typical write cycle), and direct alternative part comparisons - all extracted from DS21712C and Microchip's official package documentation.
Technical Context
The 93LC66X-I/SN implements a synchronous Microwire protocol with start-bit detection, opcode-driven instruction set (READ, WRITE, ERASE, WRAL, EWEN/EWDS), and status polling via DO pin during programming. Its dual-organization memory array is selected at power-up by ORG pin voltage level, enabling flexible byte- or word-oriented access without hardware redesign.
It integrates on-chip power-on/power-off protection (inhibits programming below 1.4 V), automatic ERAL before WRAL, and high-Z output control synchronized to CS transitions. Clock frequency support scales with VCC: up to 2 MHz at ≥4.5 V and 1 MHz at <4.5 V, with guaranteed TPD ≤400 ns and TCSL ≥250 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8 or 256 × 16 bits) - enables compact configuration storage for microcontrollers with minimal pin count. |
| Supply Voltage | 2.5 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V logic domains without level shifting. |
| Interface | 3-wire Microwire (CS/CLK/DI/DO) - reduces MCU GPIO usage versus SPI/I²C; no chip-select arbitration needed. |
| Endurance | 1,000,000 erase/write cycles - ensures reliable field calibration or runtime parameter logging over product lifetime. |
| Data Retention | >200 years at 25°C - guarantees long-term validity of stored calibration constants or security keys without refresh. |
| Operating Temp | –40°C to +85°C (Industrial) - qualified for use in automotive body control modules and industrial PLC I/O cards. |
| Write Cycle Time | 4 ms typical per word - defines minimum delay between successive WRITE commands; impacts firmware update latency. |
Pinout & Package
93LC66X-I/SN uses an 8-pin rotated SOIC package (JEDEC MS-012, "SN" designation), distinct from standard SOIC pinout. Pin numbering follows Microchip's rotated layout: Pin 1 = ORG, Pin 2 = VCC, Pin 3 = CS, Pin 4 = CLK, Pin 5 = DI, Pin 6 = DO, Pin 7 = VSS, Pin 8 = NU (not utilized).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ORG (Pin 1) | Memory organization select | Connect to VCC for 256×16 mode; to VSS for 512×8 mode; floating only allowed ≤1 MHz in x16 mode. |
| VCC (Pin 2) | Power supply | Accepts 2.5–5.5 V; internal voltage monitor disables programming below 1.4 V for power-fail safety. |
| CS (Pin 3) | Chip select | Active-high enable; must be low ≥250 ns between instructions; initiates self-timed cycles on falling edge. |
| CLK (Pin 4) | Serial clock input | Synchronizes all bit transfers; rising edge clocks DI/reads DO; stoppable mid-sequence for master flexibility. |
| DI (Pin 5) | Serial data input | Receives start bit, opcode, address, and write data; shares no internal bus with DO - avoids contention. |
| DO (Pin 6) | Serial data output / status | Outputs read data or RDY/BSY (low = busy); high-Z when CS low or not reading; requires pull-up for status polling. |
| VSS (Pin 7) | Ground reference | Return path for all I/O and core logic; decoupling capacitor placement critical near this pin for noise immunity. |
| NU (Pin 8) | No connect | Internally unconnected; must remain floating or tied to VSS/VCC per PCB design rules - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin configurable organization | Enables single BOM to support both byte- and word-addressed firmware variants without changing hardware layout. |
| Self-timed erase/write with auto-erase | Eliminates need for external timing control or watchdog timeout management in host firmware during programming. |
| RDY/BSY status via DO pin | Allows polling-based programming flow instead of fixed delays - improves system responsiveness and reduces CPU overhead. |
| Power-on/off data protection | Prevents corruption during brown-out or hot-plug events by disabling write operations until stable VCC is confirmed. |
| EWEN/EWDS command lockout | Requires explicit enable before any erase/write, preventing accidental overwrites during normal operation or noise transients. |
Applications
| Smart Meter Calibration Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing meter-specific calibration coefficients, tariff tables, and firmware version metadata across power cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed infrequently during commissioning or field updates via MCU's GPIO bit-banged Microwire interface. Use Value: 256×16 organization allows aligned storage of 16-bit ADC gain/offset values; >200-year retention eliminates recalibration schedules. |
Use Scenario: Holding I/O mapping definitions, alarm thresholds, and user-defined logic sequences in modular automation controllers. IC Role / Device Role / Timing Role: Standalone configuration EEPROM interfaced to ARM Cortex-M host; accessed during boot and runtime reconfiguration. Use Value: 1M endurance supports daily parameter tweaks in test environments; industrial temp rating ensures reliability in cabinet-mounted units. |
| Automotive Body Control Module | Medical Device Usage Log |
Use Scenario: Recording door lock actuation counts, mirror position presets, and lighting profiles in vehicle ECUs. IC Role / Device Role / Timing Role: Low-power serial EEPROM sharing MCU's 3.3 V rail; accessed only during ignition-on initialization or user input events. Use Value: 3 µA standby current extends battery life during vehicle sleep mode; –40°C to +85°C rating meets AEC-Q100 ambient requirements. |
Use Scenario: Logging sterilization cycles, operator IDs, and error timestamps in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant audit trail storage; written sequentially after each clinical event using WRAL for full-array overwrite. Use Value: WRAL + automatic ERAL ensures atomic log rotation; 4 ms write time enables sub-10 ms event capture latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66C-I/SN | Pin-compatible successor with enhanced ESD rating (8 kV HBM vs. 4 kV), improved AC timing margins, and updated qualification per current Microchip standards. | Recommended for new designs; supports same 4 Kbit x8/x16 organization and Microwire interface but adds robustness in noisy industrial environments. | Select 93LC66C-I/SN when designing new products requiring extended lifecycle support and higher reliability certification. |
| AT25040B-MAU-10 | 4 Kbit SPI interface (4-wire), 1.8–5.5 V supply, 20 MHz max clock, no ORG pin - fixed 512×8 organization only. | Requires SPI-capable MCU peripheral and additional CS line; lacks hardware-configurable word size, limiting flexibility in legacy 16-bit data architectures. | Choose AT25040B-MAU-10 only if existing design already uses SPI peripherals and does not require x16 access mode. |
Compared with 93LC66X-I/SN, the 93LC66C-I/SN offers drop-in replacement capability with superior ESD immunity and longer manufacturer support, while the AT25040B-MAU-10 trades pin count and interface simplicity for higher speed and broader voltage range - but sacrifices ORG-based organization flexibility essential for mixed-data-width systems.
Availability
93LC66X-I/SN is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration memory, and automotive body control module applications requiring stable component supply and long-term obsolescence management.
Supply support for 93LC66X-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 microcontroller, analog, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.
The 93LC66X series belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems requiring simple, deterministic nonvolatile storage with minimal MCU resource usage.
FAQ
What is the exact memory organization supported by 93LC66X-I/SN?
The 93LC66X-I/SN supports two configurations: 512 × 8 bits (when ORG = VSS) or 256 × 16 bits (when ORG = VCC). This dual-mode architecture is hardware-selectable and verified in DS21712C Tables 1-5 and 1-6. The 93LC66X-I/SN does not support other organizations; its total capacity remains fixed at 4 Kbit regardless of mode.
Does 93LC66X-I/SN require external pull-up resistors on its I/O pins?
Yes - a pull-up resistor on the DO pin is required to reliably read the Ready/Busy status signal during erase/write cycles, as DO enters high-Z state when not actively driving. CS and CLK may also benefit from weak pull-downs in noisy environments, but DI has no internal pull-up/down and must be driven actively by the host controller in all modes of operation for 93LC66X-I/SN.
Can 93LC66X-I/SN operate at 1.8 V?
No - the 93LC66X-I/SN specifies a minimum operating voltage of 2.5 V per DS21712C Section 1.0 (DC CHARACTERISTICS). Although VCC absolute maximum is 6.5 V and some related parts (e.g., 93LC66B) support 1.8 V, the 93LC66X-I/SN is not characterized or guaranteed for operation below 2.5 V; attempting 1.8 V risks failed writes, corrupted reads, or undefined behavior.
How does the WRAL command function in 93LC66X-I/SN?
The WRAL (Write All) command in 93LC66X-I/SN performs a full-memory write with built-in automatic ERAL (Erase All), completing in 16 ms typical at 5 V ±10%. It requires prior execution of EWEN and accepts one data word (16 bits in x16 mode, 8 bits in x8 mode) to replicate across all addresses. No external erase step is needed - 93LC66X-I/SN handles it autonomously.
Is 93LC66X-I/SN pin-compatible with standard 8-pin SOIC packages?
No - the 93LC66X-I/SN uses a rotated SOIC pinout (designated "X" suffix), where Pin 1 = ORG and Pin 8 = NU, unlike standard SOIC (e.g., 93LC66-I/SN) which has Pin 1 = CS and Pin 8 = VCC. Interchanging them causes functional failure; PCB layout must match the rotated footprint specified in DS21712C Page 13 for 93LC66X-I/SN.
93LC66X-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8, 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- 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
93LC66X-I/SN FAQ
1.How can I place an order for 93LC66X-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66X-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 93LC66X-I/SN reliable?
The price and inventory of 93LC66X-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 93LC66X-I/SN is usually 5 days.
3.What payment methods are accepted for 93LC66X-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66X-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66X-I/SN?
93LC66X-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66X-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 93LC66X-I/SN?
For technical support, including 93LC66X-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66X-I/SN requirements.
6.How does Aetrix verify that 93LC66X-I/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66X-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 93LC66X-I/SN meets industry standards.
7.What is the process for return or replacement of 93LC66X-I/SN?
All 93LC66X-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66X-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 93LC66X-I/SN part is unused and in its original packaging.
Return procedure for 93LC66X-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC66X-I/SN Tags
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