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Microchip Technology 93LC66BX/SN
- Part No.:
- 93LC66BX/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66BX/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,332
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Product details
Overview
93LC66BX/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 256 × 16-bit organization, operating across 2.5–5.5 V supply, supporting Industrial (−40°C to +85°C) and Automotive (−40°C to +125°C) temperature ranges, and featuring Microwire-compatible 3-wire serial interface for embedded configuration storage in microcontroller systems.
For engineers reviewing the 93LC66BX/SN datasheet, 93LC66BX/SN pinout, 93LC66BX/SN application, or 93LC66BX/SN equivalent, key selection criteria include guaranteed 16-bit word access, self-timed erase/write cycles (6 ms), Ready/Busy status signaling via DO, automatic ERAL before WRAL, and Pb-free SOIC-8 (SN) packaging compliant with RoHS.
Technical Context
The 93LC66BX/SN implements a synchronous 3-wire Microwire interface with CS, CLK, and DI/DO pins, where instructions and data are clocked on CLK rising edges. It uses dedicated 16-bit organization (no ORG pin), eliminating external configuration logic required by 'C' variants.
Its internal architecture includes auto-erase-before-write, automatic ERAL prior to WRAL, and power-on/off data protection circuitry. The device enters EWDS mode at power-up and requires explicit EWEN before any erase/write operation - a hardware-level write-protection mechanism independent of software state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (256 × 16-bit), enabling compact nonvolatile storage for calibration tables or firmware flags |
| VCC range | 2.5–5.5 V, compatible with 3.3 V and 5 V logic domains without level shifting |
| Endurance | 1,000,000 erase/write cycles, supporting frequent field updates in industrial control applications |
| Data retention | >200 years at 25°C, ensuring long-term reliability in unattended equipment |
| Write cycle time | 6 ms typical (TWC), enabling predictable timing budgeting for firmware update sequences |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO), reducing MCU GPIO count vs. SPI/I²C |
| Temp range | Industrial (−40°C to +85°C) and Automotive (−40°C to +125°C), qualified for under-hood and factory-floor use |
Pinout & Package
93LC66BX/SN is supplied in 8-lead SOIC (SN) package with standard pinout: Pin 1 = CS, Pin 2 = CLK, Pin 3 = DI, Pin 4 = DO, Pin 5 = VSS, Pin 6 = NC (no internal connection), Pin 7 = NC, Pin 8 = VCC. No ORG pin is present - fixed 16-bit organization per device family definition.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between commands to reset internal logic |
| CLK | Serial Clock | Rising-edge synchronized I/O; supports variable clock rate up to 3 MHz (VCC ≥4.5 V) |
| DI | Data Input | Accepts Start bit, opcode, address, and 16-bit data; no pull-up required if driven actively |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); high-Z when CS low or during standby |
| VSS | Ground | Reference for all digital and analog functions; must be low-impedance return path |
| VCC | Power Supply | 2.5–5.5 V input; internal POR triggers at ~1.5 V to prevent partial writes during brownout |
| NC (Pins 6 & 7) | No internal connection | Unbonded; may be left floating or tied to ground for mechanical stability - no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delay loops in host firmware |
| Automatic ERAL before WRAL | Guarantees full-array readiness before bulk write, preventing partial corruption on power loss |
| Ready/Busy status on DO | Enables efficient polling instead of fixed delays, reducing worst-case latency in real-time systems |
| EWEN/EWDS hardware lock | Prevents accidental writes even during firmware crashes or interrupt storms |
| Pb-free RoHS-compliant | Meets global environmental compliance requirements without requiring special assembly processes |
Applications
| Motor Control Configuration | Medical Device Calibration |
|---|---|
Use Scenario: Storing motor phase alignment offsets, current limit thresholds, and PID tuning parameters in brushless DC motor drives. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot and runtime reconfiguration. Use Value: Enables field-upgradable tuning without firmware reflashing; 16-bit word access matches parameter resolution requirements. | Use Scenario: Retaining sensor calibration coefficients, patient-specific therapy settings, and usage logs in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory for FDA-regulated data integrity and audit trail. Use Value: 200-year data retention ensures lifetime validity of calibration data; automotive-grade temp range supports sterilization cycles. |
| Industrial PLC I/O Mapping | Automotive Body Controller Settings |
Use Scenario: Holding I/O module slot assignments, signal scaling factors, and alarm thresholds in modular programmable logic controllers. IC Role / Device Role / Timing Role: Configuration store initialized at power-up and updated during commissioning or diagnostics. Use Value: 1M endurance supports daily reconfiguration in test benches; SOIC-8 footprint simplifies PCB layout in dense backplane designs. | Use Scenario: Storing seat position memory, mirror fold/unfold profiles, and lighting dimming curves in vehicle body control modules. IC Role / Device Role / Timing Role: Persistent user preference storage accessible over LIN or CAN gateway MCU interfaces. Use Value: −40°C to +125°C rating ensures operation during engine-off hot soak; 2.5 V min VCC supports battery brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66BT/SN | Same 256×16-bit organization, identical SOIC-8 package, but rated only for Industrial (−40°C to +85°C) range | Lacks Automotive qualification; unsuitable for under-hood or safety-critical modules requiring AEC-Q100 Grade 2 | Select 93LC66BX/SN when extended temperature operation or automotive qualification is mandatory |
| AT25128B-MAHL-T | SPI interface (4-wire), 128 Kbit capacity, 2.5–5.5 V, 1 MHz max clock, no Ready/Busy pin - requires software timeout | Higher density but slower interface; lacks hardware status signaling and auto-ERAL/WRAL features | Choose only if SPI-native MCU integration outweighs loss of Microwire simplicity and deterministic timing |
Compared with 93LC66BT/SN, the 93LC66BX/SN adds Automotive temperature support without changing pinout or firmware logic; versus AT25128B-MAHL-T, it trades density for lower pin count, faster command execution, and hardware-assisted reliability features essential in resource-constrained embedded systems.
Availability
93LC66BX/SN is available at Aetrix Electronics and suitable for motor control configuration, medical device calibration, and industrial PLC I/O mapping requiring stable component supply across automotive and industrial design lifecycles.
Supply support for 93LC66BX/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 93LC66BX/SN belongs to Microchip's legacy 93XX series of Microwire-compatible EEPROMs, designed specifically for cost-sensitive, low-pin-count embedded systems requiring robust nonvolatile storage with minimal MCU resource overhead.
FAQ
What is the memory organization of the 93LC66BX/SN?
The 93LC66BX/SN has a fixed 256 × 16-bit organization - meaning it stores 256 words of 16 bits each, totaling 4 Kbit. Unlike 'C' variants, it does not have an ORG pin; its 16-bit width is hardwired, simplifying system design by eliminating external configuration logic. This matches the 'B' designation in Microchip's 93XX66 family naming convention.
Does the 93LC66BX/SN require an external pull-up resistor on the DO pin?
No, the 93LC66BX/SN does not require an external pull-up on DO. The pin actively drives high/low during Read or Ready/Busy status reporting and enters high-impedance (High-Z) state when CS is low or during standby. Pull-ups may cause bus contention if DI and DO are shorted - a configuration discouraged unless current-limiting resistors are used.
What is the minimum VCC voltage required for reliable operation of the 93LC66BX/SN?
The 93LC66BX/SN requires a minimum VCC of 2.5 V for guaranteed operation across its full Industrial and Automotive temperature ranges. Below this threshold, internal power-on reset (POR) circuitry inhibits all commands to prevent partial writes. The datasheet specifies VPOR at ~1.5 V, but functional operation (read/write/erase) is only assured above 2.5 V.
Can the 93LC66BX/SN be used in place of the 93LC66AX/SN?
No - the 93LC66BX/SN and 93LC66AX/SN are not interchangeable without firmware changes. The 'B' version uses 16-bit words (256 × 16), while the 'A' version uses 8-bit words (512 × 8). Addressing, instruction timing, and data payload differ: READ/WRITE require 20 CLK cycles for 'B' vs. 20 for 'A' but with different bit counts (16 vs. 8 data bits), making direct substitution incompatible.
Is the 93LC66BX/SN pin-compatible with other 8-lead SOIC EEPROMs like the 25AA040A?
No - the 93LC66BX/SN is not pin-compatible with SPI-based EEPROMs such as the 25AA040A. Although both use 8-lead SOIC packages, their pin functions differ: 93LC66BX/SN uses Microwire (CS/CLK/DI/DO), while 25AA040A uses SPI (CS/CLK/SDI/SDO/HOLD/WP). Pin 6 and 7 are NC on 93LC66BX/SN but serve HOLD and WP functions on the 25AA040A, risking functional conflict if substituted.
93LC66BX/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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC66BX/SN FAQ
1.How can I place an order for 93LC66BX/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BX/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/SN reliable?
The price and inventory of 93LC66BX/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/SN is usually 5 days.
3.What payment methods are accepted for 93LC66BX/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BX/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BX/SN?
93LC66BX/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BX/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/SN?
For technical support, including 93LC66BX/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BX/SN requirements.
6.How does Aetrix verify that 93LC66BX/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66BX/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/SN meets industry standards.
7.What is the process for return or replacement of 93LC66BX/SN?
All 93LC66BX/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BX/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/SN part is unused and in its original packaging.
Return procedure for 93LC66BX/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC66BX/SN Tags
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