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Microchip Technology 93LC66AT-E/MNY
- Part No.:
- 93LC66AT-E/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
93LC66AT-E/MNY.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,563
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Product details
Overview
93LC66AT-E/MNY 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 automotive-grade temperature range (–40°C to +125°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles - used in engine control units for calibration storage.
For engineers reviewing the 93LC66AT-E/MNY datasheet, 93LC66AT-E/MNY pinout, 93LC66AT-E/MNY application, or 93LC66AT-E/MNY equivalent, key selection criteria include VCC range (2.5–5.5 V), automotive qualification (E-temp), 8-bit x512 organization, Ready/Busy status via DO pin, and compatibility with legacy Microwire controllers in safety-critical embedded systems.
Technical Context
The 93LC66AT-E/MNY implements a synchronous serial interface with start-bit detection, opcode-driven instruction set (READ/WRITE/ERASE/ERAL/WRAL/EWEN/EWDS), and hardware-level data protection via VCC monitoring (POR threshold at 2.5 V nominal). It operates without an ORG pin, fixing 8-bit word width and eliminating external configuration logic.
Its timing architecture relies on CS-controlled instruction framing, rising-edge CLK synchronization for data transfer, and DO pin dual-role operation: serial data output during READ and Ready/Busy status indication during programming - all compliant with Microwire protocol timing constraints across 1.8–5.5 V supply ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit) - fixed 8-bit organization; no ORG pin required. |
| VCC range | 2.5 V to 5.5 V - supports wide-input industrial and automotive power rails. |
| Endurance | 1,000,000 erase/write cycles - enables long-term field calibration updates. |
| Data retention | 200 years at 25°C - ensures firmware parameter integrity over product lifetime. |
| Operating temp | –40°C to +125°C (Automotive E-grade) - qualified for under-hood and transmission control applications. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy microcontrollers lacking SPI hardware. |
| Write cycle time | 6 ms typical (TWC) - deterministic programming latency for real-time system recovery sequences. |
Pinout & Package
93LC66AT-E/MNY is housed in an 8-lead 2×3 mm DFN (MNY) package with exposed pad, Pb-free Matte Tin finish. Pin 1 is marked by laser dot; exposed pad may be connected to VSS or left floating per layout requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must remain low ≥250 ns between instructions; initiates self-timed write on falling edge. |
| CLK | Serial Clock | Rising-edge synchronized I/O; clocking stops during auto-erase/write; no CLK required post-initiation. |
| DI | Data Input | Accepts start bit, opcode, address, and data; high-impedance when not selected. |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS fall; requires TCSL ≥250 ns before status check. |
| VSS | Ground | Reference for all I/O and internal circuitry; connects to exposed pad in DFN package. |
| NC | No Connection | Pin 7 is unconnected internally - must be left floating or tied to VSS per PCB design rules. |
| VCC | Power Supply | 2.5–5.5 V supply; POR circuit disables operations below ~2.5 V to prevent corruption. |
| ORG | Organization Select | Not present - 'A'-suffix device fixes 8-bit mode; pin 6 is NC in this variant. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control; 6 ms typical cycle completes autonomously after CS fall. |
| Automatic ERAL before WRAL | Ensures full-array readiness prior to bulk write - prevents partial-write corruption in power-loss scenarios. |
| Power-on/off data protection | VCC monitor disables writes below 2.5 V threshold, preventing invalid state transitions during brown-out. |
| Ready/Busy status on DO | Enables polling-based flow control without dedicated status lines - reduces MCU GPIO count. |
| Sequential read function | Allows continuous address increment on DO while CS remains high - accelerates parameter table reads. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing adaptive fuel trim values and misfire counters that update dynamically during vehicle operation. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed via Microwire during idle periods; withstands 125°C ambient and load-dump transients. Use Value: 200-year data retention and 1M endurance ensure calibration persistence across 15+ year vehicle lifetimes without refresh. | Use Scenario: Holding camera calibration offsets and radar sensor compensation coefficients updated during factory initialization and field service. IC Role / Device Role / Timing Role: Boot-time configuration store interfaced to ADAS SoC via GPIO-bitbanged Microwire; E-temp rating matches sensor module thermal profile. Use Value: Automotive qualification and VCC brown-out protection prevent corruption during ignition cycling and battery voltage sag. |
| Transmission Control Module (TCM) | Body Control Module (BCM) |
Use Scenario: Recording gear-shift learning history and clutch wear metrics accumulated over millions of drive cycles. IC Role / Device Role / Timing Role: Background logging device with interrupt-driven write triggers; operates continuously at 105°C under hood. Use Value: 6 ms deterministic write time enables tight scheduling within real-time OS task windows without blocking. | Use Scenario: Storing user-configurable lighting profiles, door lock preferences, and seat position memory across ignition cycles. IC Role / Device Role / Timing Role: Low-power configuration EEPROM accessed infrequently via low-speed MCU peripheral; standby current <5 µA. Use Value: 2.5 V minimum VCC allows direct connection to 3.3 V rail without regulator, reducing BOM cost and footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66BT-E/MNY | 16-bit (256 × 16) organization; same pinout, VCC range, and E-temp rating. | Requires 16-bit data path alignment; incompatible with 8-bit firmware drivers. | Select only if system architecture mandates 16-bit word access and controller supports dual-byte addressing. |
| AT25DF041A-SHN-T | SPI interface (4-wire), 4 Mbit density, 2.7–3.6 V VCC, industrial temp only. | Higher density but narrower voltage window and non-automotive qualification limit use in under-hood modules. | Consider for cost-sensitive consumer applications where SPI is available and extended temperature is not required. |
Compared with 93LC66BT-E/MNY, the 93LC66AT-E/MNY provides guaranteed 8-bit compatibility without rework; versus AT25DF041A-SHN-T, it delivers automotive reliability and Microwire legacy support at lower density but broader supply voltage tolerance.
Availability
93LC66AT-E/MNY is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and advanced driver assistance systems requiring stable component supply across extended automotive lifecycles.
Supply support for 93LC66AT-E/MNY 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 93LC66AT-E/MNY belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for automotive and industrial systems requiring robust, low-pin-count nonvolatile memory with deterministic timing and power-fail safety.
FAQ
What is the memory organization of the 93LC66AT-E/MNY?
The 93LC66AT-E/MNY has a fixed 512 × 8-bit organization. As an 'A'-suffix device, it does not include an ORG pin and operates exclusively in 8-bit mode - eliminating external configuration logic and ensuring deterministic address mapping for firmware compatibility.
Does the 93LC66AT-E/MNY require an external pull-up resistor on the DO pin?
No, the 93LC66AT-E/MNY does not require an external pull-up on DO. The pin actively drives high/low during READ and Ready/Busy status reporting, and enters High-Z when deselected or idle. External pull-ups may interfere with valid status signaling and are not recommended per Microchip's design guidelines.
What is the minimum VCC voltage required to guarantee proper operation of the 93LC66AT-E/MNY?
The 93LC66AT-E/MNY requires a minimum VCC of 2.5 V for guaranteed functional operation. Its power-on reset (POR) circuit disables all write operations below approximately 2.5 V to prevent data corruption during brown-out conditions - a critical feature for automotive power systems.
Can the 93LC66AT-E/MNY be used in place of a 93LC66CT-E/MNY without hardware changes?
No, the 93LC66AT-E/MNY cannot directly replace the 93LC66CT-E/MNY. The 'C' version includes an ORG pin to select between 8-bit and 16-bit modes, while the 'A' version fixes 8-bit operation and leaves ORG unconnected. Hardware changes would be needed to remove ORG routing and update firmware to omit ORG control logic.
What package type does the 93LC66AT-E/MNY use, and is the exposed pad electrically connected?
The 93LC66AT-E/MNY uses an 8-lead 2×3 mm DFN package (MNY suffix). Its exposed pad is internally connected to VSS and must be soldered to a PCB thermal pad tied to ground for optimal thermal performance and EMI suppression - though it may be left floating if thermal constraints permit.
93LC66AT-E/MNY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8
- 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-TDFN (2x3)
93LC66AT-E/MNY FAQ
1.How can I place an order for 93LC66AT-E/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66AT-E/MNY 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 93LC66AT-E/MNY reliable?
The price and inventory of 93LC66AT-E/MNY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93LC66AT-E/MNY is usually 5 days.
3.What payment methods are accepted for 93LC66AT-E/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66AT-E/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66AT-E/MNY?
93LC66AT-E/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66AT-E/MNY 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 93LC66AT-E/MNY?
For technical support, including 93LC66AT-E/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66AT-E/MNY requirements.
6.How does Aetrix verify that 93LC66AT-E/MNY is sourced from the original manufacturer or authorized distributors?
All 93LC66AT-E/MNY 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 93LC66AT-E/MNY meets industry standards.
7.What is the process for return or replacement of 93LC66AT-E/MNY?
All 93LC66AT-E/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66AT-E/MNY, 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 93LC66AT-E/MNY part is unused and in its original packaging.
Return procedure for 93LC66AT-E/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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