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Microchip Technology 93LC66A-E/SN
- Part No.:
- 93LC66A-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66A-E/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:441
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Product details
Overview
93LC66A-E/SN from Microchip Technology Inc. is a 4 Kbit (512 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, operating from 2.5V to 5.5V, rated for automotive temperature range (−40°C to +125°C), and featuring self-timed erase/write cycles, automatic ERAL/WRAL support, and Ready/Busy status signaling via DO pin - used for nonvolatile configuration storage in engine control units and automotive sensor modules.
For engineers reviewing the 93LC66A-E/SN datasheet, 93LC66A-E/SN pinout, 93LC66A-E/SN application, or 93LC66A-E/SN equivalent, key selection criteria include VCC range (2.5–5.5 V), automotive-grade temp rating (−40°C to +125°C), 512 × 8-bit organization, 1M endurance cycles, and SOIC-8 (SN) package compatibility with legacy PCB layouts.
Technical Context
The 93LC66A-E/SN implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (fixed 8-bit word size). It uses internal auto-erase-before-write logic and supports sequential read, ERAL (Erase All), and WRAL (Write All) commands with status polling via DO pin during active programming.
Power-on data protection is enforced by a built-in voltage detector (VPOR = 2.5 V typ.), and write operations require explicit EWEN enable followed by EWDS disable for robustness. Standby current is ≤5 µA at −40°C to +125°C, supporting low-power automotive subsystems.
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 - compatible with 3.3 V and 5 V automotive microcontroller I/O domains. |
| Temp Range | −40°C to +125°C (Automotive E-grade) - qualified for under-hood and transmission control module use. |
| Endurance | 1,000,000 erase/write cycles - supports frequent calibration updates in adaptive systems. |
| Data Retention | 200 years at +125°C - ensures long-term reliability across vehicle lifetime without refresh. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage; no SPI mode or address lines required. |
| Write Cycle Time | 6 ms typical (TWC) - deterministic timing enables predictable interrupt latency in safety-critical routines. |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free Matte Tin finish, body size 3.9 mm × 4.9 mm, standard JEDEC MS-012AA footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; controls standby entry/exit and Ready/Busy polling window. |
| CLK | Serial Clock | Positive-edge synchronized I/O; supports up to 3 MHz (VCC ≥ 4.5 V); clock may pause mid-transfer without state loss. |
| DI | Data Input | Accepts Start bit, opcode, address, and data; high-impedance when CS low; requires external pull-down if shared with DO. |
| DO | Data Output / Status | Tri-state output: delivers read data or Ready/Busy (low = busy); enters High-Z on CS falling edge. |
| VSS | Ground | Reference for all I/O and internal logic; must be low-impedance connection to minimize noise coupling. |
| NC | No Connection | Pin 7 in SOIC-8; internally unconnected; must be left floating or tied to VSS per layout best practice. |
| VCC | Power Supply | 2.5–5.5 V supply; includes on-chip POR circuitry that inhibits writes below ~2.5 V threshold. |
| ORG | Organization Select | Not present on 93LC66A - NC function; dedicated x8 device; no external logic required for word-size configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates external timing control; 6 ms max cycle time ensures deterministic firmware update windows. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; prevents partial-program corruption in power-loss scenarios. |
| Ready/Busy Status via DO | Enables polling-based write completion detection without additional GPIO or interrupts - critical for ASIL-B software flow. |
| Power-On/Off Data Protection | Voltage detector blocks writes below 2.5 V; prevents bit corruption during brown-out or cold crank conditions. |
| 1,000,000 Endurance Cycles | Supports daily recalibration over 27 years at 100 writes/day - exceeds automotive OEM requirements for ECU memory. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing adaptive fuel trim values, knock sensor learning offsets, and emission calibration tables subject to field updates. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed via MCU's Microwire peripheral during boot and runtime reconfiguration. Use Value: 512 × 8-bit capacity matches typical ECU parameter set size; automotive temp rating ensures operation during hot-soak testing. | Use Scenario: Retaining camera lens focus profiles, radar beamforming coefficients, and sensor fusion bias corrections across ignition cycles. IC Role / Device Role / Timing Role: Dedicated calibration memory co-located with vision/radar SoC; accessed during system initialization and periodic self-test. Use Value: 1M endurance supports nightly OTA calibration uploads; 200-year retention avoids field recalls due to data decay. |
| Transmission Control Module (TCM) | Body Control Module (BCM) |
Use Scenario: Logging gear shift adaptation history, clutch wear metrics, and torque converter lock-up timing adjustments. IC Role / Device Role / Timing Role: Fault-tolerant storage element interfaced through isolated CAN gateway MCU with Microwire hardware support. Use Value: 2.5–5.5 V VCC range accommodates wide battery swing (6–16 V); ERAL/WRAL simplifies full-map updates during service mode. | Use Scenario: Holding door lock actuator timing profiles, ambient light sensor gain settings, and seat position presets. IC Role / Device Role / Timing Role: Low-power configuration store accessed only during wake-up events; leverages <5 µA standby current. Use Value: SOIC-8 (SN) package allows drop-in replacement of legacy EEPROMs; RoHS/Pb-free compliance meets global vehicle regulations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66B-E/SN | 16-bit word organization (256 × 16); same VCC/temp specs; no ORG pin - fixed x16 mode. | Requires MCU firmware rework for 16-bit addressing and data packing; unsuitable for byte-accessed legacy configs. | Select only if system architecture mandates 16-bit native access and memory map alignment justifies firmware effort. |
| AT25DF041A-SHN-T | SPI interface (4-wire), 4 Mbit density, sector-erase capability; no Ready/Busy pin; different command set. | Lacks DO-based status polling; requires SPI master with wait-state handling; higher density but incompatible protocol stack. | Consider only for new designs where SPI infrastructure exists and >4 Kbit capacity is needed - not a functional substitute. |
Compared with 93LC66B-E/SN, the 93LC66A-E/SN provides native byte-level access without data packing overhead; versus AT25DF041A-SHN-T, it offers deterministic 6 ms write timing and hardware status signaling - critical for real-time automotive diagnostics and fail-safe logging.
Availability
93LC66A-E/SN is available at Aetrix Electronics and suitable for automotive control units, ADAS calibration systems, and body electronics requiring stable component supply with guaranteed automotive-grade qualification and long-term lifecycle support.
Supply support for 93LC66A-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 microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The 93LC66A belongs to Microchip's legacy 93XX serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count nonvolatile storage in automotive, industrial, and consumer systems requiring proven reliability and long-term availability.
FAQ
What is the maximum clock frequency supported by the 93LC66A-E/SN?
The 93LC66A-E/SN supports up to 3 MHz clock frequency when VCC is 4.5 V to 5.5 V, 2 MHz at 2.5 V to 4.5 V, and 1 MHz at 1.8 V to 2.5 V - though the 93LC66A-E/SN is specified only for 2.5 V minimum, so 2 MHz is its practical maximum at nominal 3.3 V operation. This timing is defined in Table 1-2 (A1) of DS21795E.
Does the 93LC66A-E/SN have an ORG pin, and how does it affect memory organization?
No, the 93LC66A-E/SN does not have an ORG pin - it is a fixed 8-bit (512 × 8) organization device. The ORG pin is only present on 'C' variants (e.g., 93LC66C); 'A' versions like the 93LC66A-E/SN are dedicated x8 devices, eliminating external configuration logic and simplifying PCB layout.
How is data protection implemented during power transitions in the 93LC66A-E/SN?
The 93LC66A-E/SN incorporates an internal voltage detector (VPOR ≈ 2.5 V) that disables all write/erase operations when VCC drops below this threshold - preventing data corruption during brown-out or cold-crank conditions. Additionally, the device powers up in EWDS (Erase/Write Disable) mode, requiring an explicit EWEN command before any programming.
What is the purpose of the NC pin on the 93LC66A-E/SN SOIC-8 package?
Pin 7 of the 93LC66A-E/SN in SOIC-8 (SN) package is marked NC (No Connection) - it has no internal bond wire or circuit connection. Per Microchip's Package Types diagram (DS21795E-page 2), this pin must be left floating or tied to VSS for mechanical stability; it must never be driven or used as a signal path.
Can the 93LC66A-E/SN be used in place of the 93AA66A-E/SN?
No - the 93LC66A-E/SN and 93AA66A-E/SN share identical pinout and 512 × 8 organization but differ in VCC range (93LC66A: 2.5–5.5 V; 93AA66A: 1.8–5.5 V) and endurance characterization. Substituting them requires validation of low-voltage operation down to 1.8 V and confirmation of data retention at extended low-VCC stress conditions.
93LC66A-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:
- 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-SOIC
93LC66A-E/SN FAQ
1.How can I place an order for 93LC66A-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66A-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 93LC66A-E/SN reliable?
The price and inventory of 93LC66A-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 93LC66A-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC66A-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66A-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66A-E/SN?
93LC66A-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66A-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 93LC66A-E/SN?
For technical support, including 93LC66A-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66A-E/SN requirements.
6.How does Aetrix verify that 93LC66A-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66A-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 93LC66A-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC66A-E/SN?
All 93LC66A-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66A-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 93LC66A-E/SN part is unused and in its original packaging.
Return procedure for 93LC66A-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93LC66A-E/SN Tags
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AT24C02C-XHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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