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Microchip Technology 93LC66BX-E/SN
- Part No.:
- 93LC66BX-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66BX-E/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,012
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Product details
Overview
93LC66BX-E/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 supply and rated for automotive temperature range (−40°C to +125°C). It features Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), self-timed erase/write cycles (6 ms typical), 1 million endurance cycles, and >200-year data retention. Used in automotive body control modules for storing calibration data and configuration settings.
For engineers reviewing the 93LC66BX-E/SN datasheet, 93LC66BX-E/SN pinout, 93LC66BX-E/SN application, or 93LC66BX-E/SN equivalent, key selection criteria include automotive-grade temperature support, 8-bit word organization (no ORG pin), SOIC-8 package compatibility, and integrated power-on/off data protection circuitry.
Technical Context
This device implements a synchronous serial Microwire interface with start-bit detection, opcode-driven command set (READ/WRITE/ERASE/ERAL/WRAL), and Ready/Busy status reporting via DO pin. It requires no external timing components and supports sequential read mode when CS remains high.
Internal logic includes address decoder, mode decode logic, clock register, and output buffer. The absence of ORG pin confirms fixed 8-bit organization - eliminating configuration dependency and simplifying host firmware design for deterministic byte-aligned access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit) - provides compact nonvolatile storage for firmware parameters and runtime variables |
| VCC range | 2.5 V to 5.5 V - compatible with 3.3 V and 5 V systems without level-shifting |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates in telematics and diagnostics applications |
| Data retention | >200 years at +25°C - ensures long-term reliability over vehicle lifetime without refresh |
| Write cycle time | 6 ms max (TWC) - enables predictable timeout handling in safety-critical boot sequences |
| Temperature grade | Automotive (−40°C to +125°C) - qualified for under-hood and infotainment ECU environments |
| Interface | 3-wire Microwire (CS/CLK/DI/DO) - minimal pin count and PCB footprint for space-constrained modules |
Pinout & Package
8-pin SOIC package (SN suffix), Pb-free Matte Tin finish, standard 150-mil body width. Pin 1 marked by laser dot; pin 1 ID corner defined per JEDEC MS-012.
| 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 | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data; stoppable mid-sequence |
| 3 (DI) | Data Input | Accepts start bit, instruction opcodes, address bits, and write data; high-impedance when not selected |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| 5 (VSS) | Ground | Reference return path for all I/O and internal logic; must be low-impedance connection |
| 6 (NC) | No Connect | Internally unconnected; must remain floating or tied to VSS per layout best practice |
| 7 (NC) | No Connect | Internally unconnected; no routing or loading required |
| 8 (VCC) | Power Supply | Supplies core and I/O circuitry; bypass capacitor (0.1 µF) required within 10 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond TWC (6 ms) - simplifies driver implementation |
| Auto-erase before write | Guarantees clean write operation without separate erase command - reduces firmware complexity and latency |
| Power-on/off data protection | Hardware-level VCC monitoring (VPOR = 1.5 V) disables writes below safe threshold - prevents corruption during brown-out |
| Ready/Busy status via DO | Enables efficient polling without dedicated status lines - conserves MCU GPIO resources in resource-limited ECUs |
| Sequential read mode | Allows continuous burst reads across memory space with single CS assertion - improves parameter table access speed |
Applications
| Automotive Body Control Module | Industrial Sensor Node |
|---|---|
Use Scenario: Storing seat position presets, mirror calibration offsets, and door lock configuration in a Class A vehicle platform. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed write integrity during ignition cycling and battery transients. Use Value: Automotive temperature rating and power-loss protection ensure reliable recall of user preferences after 15+ year service life. | Use Scenario: Retaining sensor linearization coefficients and factory calibration data in a wireless environmental monitor deployed outdoors. IC Role / Device Role / Timing Role: Persistent parameter storage accessible via low-pin-count MCU interface with minimal power overhead. Use Value: 1M endurance and >200-year retention eliminate field recalibration needs across product lifecycle. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Logging dose history, alarm thresholds, and user-accessible safety limits in an FDA-cleared infusion system. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage of critical operational parameters with hardware write-protection (EWDS/EWEN). Use Value: Integrated erase/write disable logic prevents accidental overwrite during routine maintenance or firmware updates. | Use Scenario: Holding tariff tables, metering constants, and cryptographic keys in a utility-grade electricity meter certified to IEC 62056. IC Role / Device Role / Timing Role: Trusted nonvolatile memory with deterministic 6 ms write latency for time-stamped event logging. Use Value: Microwire interface compatibility enables direct connection to legacy meter SoCs without protocol translation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66BT-I/SN | Industrial temp grade (−40°C to +85°C); identical 512×8 organization, SOIC-8 package, and electrical specs | Lacks automotive qualification; unsuitable for under-hood or safety-critical ECU use | Select only for cost-sensitive industrial or consumer designs where extended temperature is not required |
| AT25DF041A-SHN-T | 4 Mbit SPI Flash (not EEPROM); sector erase, no byte-write; requires different command set and driver stack | Higher density but lacks true byte-alterable EEPROM behavior; no built-in auto-erase or WRAL/ERAL | Consider only if migrating to SPI-based architecture and accepting firmware rewrite for erase granularity and latency trade-offs |
Compared with 93LC66BT-I/SN, the 93LC66BX-E/SN adds automotive qualification and tighter VCC min (2.5 V vs. same), while AT25DF041A-SHN-T offers higher density at the cost of EEPROM functionality and interface compatibility - making 93LC66BX-E/SN optimal for drop-in replacement in legacy Microwire-based automotive designs.
Availability
93LC66BX-E/SN is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor nodes, and medical device manufacturing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 93LC66BX-E/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, with global design and manufacturing operations.
The 93LC66X family belongs to Microchip's serial EEPROM product line, designed specifically for low-power, pin-efficient nonvolatile storage in automotive, industrial, and medical applications where reliability and qualification matter.
FAQ
What is the memory organization of the 93LC66BX-E/SN?
The 93LC66BX-E/SN has a fixed 512 × 8-bit organization. It is an 'A'-type device in the 93LC66 family, meaning it does not include an ORG pin and operates exclusively in 8-bit word mode - eliminating configuration uncertainty and simplifying host interface design. This differs from 'C' variants which require external logic to select 8- or 16-bit mode.
Does the 93LC66BX-E/SN support automatic erase before write?
Yes, the 93LC66BX-E/SN performs automatic erase before each write operation - a core feature of its self-timed programming architecture. This eliminates the need for separate ERASE commands prior to WRITE, reducing firmware overhead and ensuring data integrity even during partial-page updates. The full cycle completes in ≤6 ms (TWC) at VCC ≥2.5 V.
What is the function of the NC pins on the 93LC66BX-E/SN SOIC package?
Pins 6 and 7 on the 93LC66BX-E/SN (SOIC-8) are No Connect (NC) terminals - internally unconnected and electrically isolated. They must remain floating or be tied to VSS per Microchip's layout recommendations; routing signals or applying voltage to these pins may cause undefined behavior or damage. Their presence accommodates family-wide pinout compatibility across 'A', 'B', and 'C' variants.
How does the 93LC66BX-E/SN indicate Ready/Busy status during programming?
The 93LC66BX-E/SN reports Ready/Busy status on the DO pin: logical '0' indicates ongoing erase/write, and logical '1' indicates completion. To sample this, CS must be brought high for ≥250 ns after initiating the operation (TCSL), then DO is sampled synchronously with CLK. Issuing a Start bit followed by CS low clears the status flag - enabling robust polling loops in safety-critical firmware.
Is the 93LC66BX-E/SN RoHS compliant and Pb-free?
Yes, the 93LC66BX-E/SN is Pb-free and RoHS compliant, with a Matte Tin (Sn) finish on all leads per Microchip's DS21795E documentation. The 'SN' package suffix explicitly denotes the 8-pin SOIC variant with this environmentally compliant plating, verified through JESD22-A112 testing and certified to EU Directive 2011/65/EU.
93LC66BX-E/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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93LC66BX-E/SN FAQ
1.How can I place an order for 93LC66BX-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66BX-E/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-E/SN reliable?
The price and inventory of 93LC66BX-E/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-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC66BX-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66BX-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66BX-E/SN?
93LC66BX-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66BX-E/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-E/SN?
For technical support, including 93LC66BX-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66BX-E/SN requirements.
6.How does Aetrix verify that 93LC66BX-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66BX-E/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-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC66BX-E/SN?
All 93LC66BX-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66BX-E/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-E/SN part is unused and in its original packaging.
Return procedure for 93LC66BX-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC66BX-E/SN Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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