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Microchip Technology 93LC66CT-E/SN
- Part No.:
- 93LC66CT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66CT-E/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,131
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Product details
Overview
93LC66CT-E/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 integrated power-on/off data protection. It operates from 2.5 V to 5.5 V, supports Industrial and Automotive temperature ranges (−40°C to +125°C), and delivers 1,000,000 erase/write cycles with >200 years data retention - used for configuration storage in automotive body control modules.
For engineers reviewing the 93LC66CT-E/SN datasheet, 93LC66CT-E/SN pinout, 93LC66CT-E/SN application, or 93LC66CT-E/SN equivalent, key selection criteria include its 8-bit x512 memory map, ORG pin absence (fixed x8 mode), TSSOP-8 package compatibility, and automotive-grade reliability under transient voltage and thermal stress.
Technical Context
The 93LC66CT-E/SN implements a synchronous serial Microwire protocol with start-bit detection, self-timed erase/write cycles (6 ms typical), and Ready/Busy status output via DO pin. Its internal logic enforces EWEN/EWDS write-protection sequencing and automatic ERAL before WRAL.
It uses CMOS technology optimized for low-power operation: standby current ≤5 µA at 2.5 V, read current ≤1 µA at 2.5 V/2 MHz, and write current ≤2 µA at 2.5 V - enabling battery-backed systems and automotive sleep-mode compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit) - fixed x8 organization; no ORG pin; suitable for byte-aligned firmware parameter storage. |
| VCC range | 2.5 V to 5.5 V - supports wide-input automotive power rails and brown-out immunity down to 2.5 V. |
| Endurance | 1,000,000 erase/write cycles - enables frequent calibration updates in engine control units without wear-out risk. |
| Data retention | >200 years at 25°C - ensures long-term integrity of vehicle VIN, odometer, or security keys across product lifetime. |
| Write cycle time | 6 ms max (TWC) - deterministic programming latency for real-time configuration commits during power-down sequences. |
| Temperature grade | Automotive (E): −40°C to +125°C - qualified for under-hood and transmission control module environments. |
| Interface | 3-wire Microwire (CS/CLK/DI/DO) - minimal GPIO usage; compatible with legacy microcontrollers lacking SPI hardware. |
Pinout & Package
93LC66CT-E/SN is housed in an 8-lead TSSOP (SN) package per Microchip DS21795E, with exposed pad optional per packaging spec. Pin functions are validated per Device Selection Table and Pin Function Table in the datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; controls Standby entry and Ready/Busy polling window. |
| CLK | Serial Clock | Synchronizes all data transfers on rising edge; clock-stoppable; timing-critical for TCKH/TCKL compliance (≥200 ns high/100 ns low @2.5 V). |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; requires setup/hold times (TDIS/TDIH) relative to CLK. |
| DO | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters High-Z when CS low or during non-read operations. |
| VSS | Ground | Reference for all I/O and internal logic; must be low-impedance connection to avoid noise-induced corruption. |
| NC | No Connect | Pin 7 is unconnected internally; must be left floating or tied to VSS per layout best practice - not used for ORG. |
| VCC | Power Supply | Supplies core logic and memory array; includes internal POR circuit triggering at ~2.5 V threshold. |
| ORG | Organization Select | Not present on 93LC66A/B variants - this device is fixed x8; pin 6 is NC (no internal connection). |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control; 6 ms max cycle completes autonomously after CS fall, freeing MCU resources. |
| Automatic ERAL before WRAL | Ensures full-array write safety - prevents partial writes by forcing full-erase prior to bulk programming. |
| Power-on/off data protection | Hardware-level lockout below VCC = 2.5 V prevents corruption during supply ramp-up/down or brownout events. |
| Ready/Busy status via DO | Enables efficient polling instead of fixed delays; reduces system latency and avoids unnecessary retries. |
| EWEN/EWDS write protection | Prevents accidental overwrites; device powers up in EWDS state - explicit enable required before any write. |
Applications
| Engine Control Unit (ECU) | Instrument Cluster Module |
|---|---|
Use Scenario: Storing adaptive fuel trim values, fault codes, and mileage counters that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed via Microwire during boot and runtime diagnostics. Use Value: 1M endurance and >200-year retention ensure accurate odometer logging and emissions compliance over 15+ year vehicle life. | Use Scenario: Holding display brightness profiles, user preferences, and warning message history in digital dashboards. IC Role / Device Role / Timing Role: Low-pin-count serial EEPROM interfaced to 8-bit MCU with limited SPI peripherals. Use Value: 2.5–5.5 V operation and −40°C to +125°C rating allow direct integration into instrument cluster PCBs near LCD drivers. |
| Body Control Module (BCM) | Advanced Driver Assistance System (ADAS) Camera ECU |
Use Scenario: Saving door lock/unlock patterns, mirror position presets, and lighting configuration across power loss. IC Role / Device Role / Timing Role: Secure, low-power memory for user-customizable settings with tamper-resistant write-enable sequence. Use Value: EWEN/EWDS protocol prevents unintended reprogramming during CAN bus noise or ESD transients. | Use Scenario: Storing camera calibration coefficients and lens distortion maps updated during factory alignment or service. IC Role / Device Role / Timing Role: Automotive-qualified serial EEPROM accessed during boot to initialize image processing pipeline. Use Value: TSSOP-8 package enables compact placement near image sensor ASIC; 6 ms write time aligns with fast boot requirements. |
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 | 16-bit x256 organization; same VCC range (2.5–5.5 V), but no ORG pin - fixed x16 mode. | Requires 16-bit data path and software handling; incompatible with existing 8-bit address/data framing. | Select only if system architecture mandates word-aligned access and MCU supports 16-bit Microwire framing. |
| AT25DF041A-SHN-T | 4 Mbit SPI NOR Flash; quad I/O capable; no built-in write-protection commands; 2.7–3.6 V only. | Lacks EWEN/EWDS, auto-ERAL, and micropower standby; requires external sector locking for data safety. | Use only where higher density and faster sequential reads outweigh EEPROM-specific reliability and low-voltage advantages. |
Compared with 93LC66B-I/SN, the 93LC66CT-E/SN provides byte-aligned access and simpler firmware integration; versus AT25DF041A-SHN-T, it offers superior write endurance, wider voltage range, and hardware-enforced data protection - critical for automotive safety-critical parameters.
Availability
93LC66CT-E/SN is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and medical instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for 93LC66CT-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 93LC66 series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for cost-sensitive, low-power, and automotive-qualified nonvolatile memory applications requiring robust data integrity and simple 3-wire interfacing.
FAQ
What is the memory organization of the 93LC66CT-E/SN?
The 93LC66CT-E/SN has a fixed 512 × 8-bit (4 Kbit) organization. It is an 'A' variant, meaning the ORG pin is not implemented - pin 6 is NC. This eliminates configuration ambiguity and simplifies PCB layout compared to 'C' variants requiring external ORG biasing.
Does the 93LC66CT-E/SN support automotive temperature range?
Yes, the 93LC66CT-E/SN is rated for the Automotive (E) temperature range of −40°C to +125°C. The 'E' suffix in the part number explicitly denotes this qualification, and electrical specifications in DS21795E are guaranteed across this full range at VCC = 2.5 V to 5.5 V.
How does write protection work on the 93LC66CT-E/SN?
The 93LC66CT-E/SN powers up in Erase/Write Disable (EWDS) mode. An explicit EWEN instruction must precede any ERASE or WRITE command. After programming, issuing EWDS restores protection - preventing accidental overwrites during noise or reset events. This two-step enable/disable is hardware-enforced.
What package type is used for the 93LC66CT-E/SN?
The 93LC66CT-E/SN uses an 8-lead TSSOP package, indicated by the 'SN' suffix. Per Microchip DS21795E, this package has standard 0.65 mm lead pitch, body dimensions of 3.0 × 4.4 mm, and pin 1 marked by laser indentation - verified in Package Types diagrams on pages 2–3.
Can the 93LC66CT-E/SN be used with a 3.3 V microcontroller?
Yes, the 93LC66CT-E/SN operates reliably at 3.3 V, which falls within its specified 2.5–5.5 V VCC range. Input thresholds (VIH1 = 2.0 V min, VIL1 = 0.8 V max) and output drive (VOH1 = 2.4 V min at 4.5 V, VOL1 = 0.4 V max) ensure clean logic compatibility with 3.3 V CMOS I/O without level shifting.
93LC66CT-E/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:
- 512 x 8, 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 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
93LC66CT-E/SN FAQ
1.How can I place an order for 93LC66CT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66CT-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 93LC66CT-E/SN reliable?
The price and inventory of 93LC66CT-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 93LC66CT-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC66CT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66CT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66CT-E/SN?
93LC66CT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66CT-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 93LC66CT-E/SN?
For technical support, including 93LC66CT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66CT-E/SN requirements.
6.How does Aetrix verify that 93LC66CT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66CT-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 93LC66CT-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC66CT-E/SN?
All 93LC66CT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66CT-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 93LC66CT-E/SN part is unused and in its original packaging.
Return procedure for 93LC66CT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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