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Microchip Technology 93LC66AXT-E/SN
- Part No.:
- 93LC66AXT-E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93LC66AXT-E/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,730
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Product details
Overview
93LC66AXT-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 - used for nonvolatile parameter storage in engine control units and automotive sensor modules.
For engineers reviewing the 93LC66AXT-E/SN datasheet, 93LC66AXT-E/SN pinout, 93LC66AXT-E/SN application, or 93LC66AXT-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) packaging with Pb-free Matte Tin finish.
Technical Context
This device implements a synchronous serial Microwire interface with CS, CLK, DI, and DO pins; supports dedicated 8-bit communication (no ORG pin); uses internal auto-erase before write; and provides hardware-level power-on/off data protection. It requires EWEN command prior to any erase/write operation and reports status via DO pin during programming.
Timing is governed by strict AC parameters: max clock frequency of 3 MHz at VCC ≥ 4.5 V, TWC = 6 ms program cycle time, and TCSL ≥ 250 ns between instructions. The device enters Standby mode when CS is low and draws only 1–5 µA ICCS, enabling ultra-low-power retention in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit) - fixed x8 organization, no ORG pin, eliminating external configuration logic |
| VCC range | 2.5 V to 5.5 V - supports wide-input automotive power rails and brown-out immunity down to 2.5 V |
| Temperature grade | Automotive (E): −40°C to +125°C - qualified for under-hood and transmission control applications |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in firmware update or calibration logging use cases |
| Data retention | > 200 years at +25°C - guarantees persistent storage across vehicle lifetime without refresh |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage, compatible with legacy MCU peripherals |
| Package | 8-lead SOIC (SN) - industry-standard footprint, RoHS-compliant Matte Tin finish, 150-mil body width |
Pinout & Package
8-lead SOIC (SN) package with standard 150-mil width, Pb-free Matte Tin plating, and pin 1 marked by laser dot. Pinout matches industry-standard Microwire EEPROM layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between commands; initiates self-timed programming on falling edge |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| 3 (DI) | Data Input | Receives Start bit, opcodes, addresses, and write data; high-impedance when not selected |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); tri-states on CS fall; requires polling for completion |
| 5 (VSS) | Ground | Reference return path for all I/O and core logic; must be low-impedance for noise immunity |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 (NC) | No Connect | Not bonded; electrically isolated; no routing or termination required |
| 8 (VCC) | Power Supply | Supplies core and I/O; includes on-chip POR detection at 2.5 V threshold for safe initialization |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control; 6 ms typical cycle time enables deterministic firmware flow without delay loops |
| Automatic ERAL before WRAL | Guarantees full-array readiness before bulk write; removes need for separate erase command in calibration reset sequences |
| Power-on/off data protection | Hardware lockout below 2.5 V prevents corruption during supply ramp-up/down - critical for ignition-switched systems |
| Ready/Busy status on DO | Enables efficient polling instead of fixed delays; reduces CPU overhead and improves system responsiveness |
| 1 M endurance / 200 yr retention | Validated for automotive lifecycle requirements; supports >100 calibrations/year over 15-year vehicle service life |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Storing adaptive fuel trim values, learned idle air control parameters, and fault code history across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter memory interfaced directly to ECU's 3-wire SPI-like peripheral; accessed during boot and runtime calibration routines. Use Value: Maintains engine performance optimization after power loss; withstands repeated writes during closed-loop learning without degradation. | Use Scenario: Retaining door lock/unlock preferences, window position memory, and lighting configuration settings. IC Role / Device Role / Timing Role: Dedicated configuration storage for BCM microcontroller; accessed during power-up initialization and user input events. Use Value: Enables personalized user experience across vehicle lifetime; operates reliably at 125°C ambient near fuse boxes. |
| Transmission Control Unit (TCU) | Tire Pressure Monitoring System (TPMS) Sensor |
Use Scenario: Logging gear shift adaptation data, clutch wear metrics, and diagnostic snapshots for predictive maintenance. IC Role / Device Role / Timing Role: High-reliability data logger interfaced via Microwire; written during shift events and read during service diagnostics. Use Value: Supports ASAM-compliant diagnostics; 1M endurance exceeds 100k shift cycles over 15 years. | Use Scenario: Storing unique sensor ID, calibration offsets, and battery voltage history in ultra-low-power TPMS transmitters. IC Role / Device Role / Timing Role: Low-quiescent-current nonvolatile memory; powered intermittently from energy-harvesting circuitry. Use Value: Draws only 1–5 µA in standby; retains data through 10+ year battery life; qualified for extended temperature excursions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66BXT-E/SN | 512 × 16-bit organization; same VCC/temp/package; requires 16-bit MCU interface alignment | Used where MCU natively supports 16-bit serial transfers; avoids software bit-packing for word-aligned data | Select if system architecture mandates 16-bit word access and eliminates need for byte-splitting logic |
| AT25DF041A-SHN-T | SPI interface (4-wire), 4 Mbit density, 2.7–3.6 V only, no automotive temp grade | Higher density for firmware patch storage; lacks automotive qualification and wide-VCC support | Consider only for non-automotive industrial designs requiring SPI compatibility and larger capacity |
Compared with 93LC66BXT-E/SN, the 93LC66AXT-E/SN offers simpler 8-bit data handling and broader voltage flexibility; versus AT25DF041A-SHN-T, it delivers guaranteed automotive qualification and lower minimum VCC, making it the sole choice for safety-critical under-hood storage.
Availability
93LC66AXT-E/SN is available at Aetrix Electronics and suitable for automotive control units, sensor calibration systems, and battery-powered telematics modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 93LC66AXT-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 components, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93LC66A/B/C family was designed specifically for automotive and industrial applications requiring robust, low-power, Microwire-compatible serial EEPROM with extended temperature operation and high endurance.
FAQ
What is the memory organization of the 93LC66AXT-E/SN?
The 93LC66AXT-E/SN is a fixed 512 × 8-bit (4 Kbit) EEPROM with no ORG pin - it operates exclusively in x8 mode. Unlike 'C' variants, it does not support dynamic word-size selection, simplifying hardware design and eliminating external ORG biasing components. This configuration is confirmed in the Device Selection Table and Pin Function Table of DS21795E.
Does the 93LC66AXT-E/SN require an external enable command before writing?
Yes, the 93LC66AXT-E/SN powers up in Erase/Write Disable (EWDS) mode and requires an explicit EWEN (Erase/Write Enable) instruction before any ERASE or WRITE operation. This hardware lockout prevents accidental overwrites during power transitions or noise events - a critical feature verified in Section 2.6 and Figure 2-6 of DS21795E.
What is the maximum clock frequency supported by the 93LC66AXT-E/SN?
The 93LC66AXT-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 below 2.5 V - as specified in Table 1-2 (A1). These graded limits ensure reliable timing margin across its full 2.5–5.5 V operating range, with all values measured and characterized per DS21795E.
Is the 93LC66AXT-E/SN qualified for automotive applications?
Yes, the 93LC66AXT-E/SN carries the 'E' temperature grade suffix and is fully qualified for automotive use from −40°C to +125°C. Its datasheet explicitly lists 'Automotive (E)' in the Device Selection Table and specifies electrical characteristics over that range in Tables 1-1 and 1-2 - confirming compliance with AEC-Q100 stress testing requirements.
How is data integrity protected during power loss on the 93LC66AXT-E/SN?
Data integrity is protected by on-chip power-on/power-off detection that inhibits all operations when VCC falls below 2.5 V (VPOR = 2.5 V, per D11 in Table 1-1). Combined with automatic write inhibit in EWDS mode and hardware-level block locking, this ensures no partial writes occur during brownout - a behavior validated in Section 2.3 and Figure 1-1 of DS21795E.
93LC66AXT-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:
- 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-SOIC
93LC66AXT-E/SN FAQ
1.How can I place an order for 93LC66AXT-E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93LC66AXT-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 93LC66AXT-E/SN reliable?
The price and inventory of 93LC66AXT-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 93LC66AXT-E/SN is usually 5 days.
3.What payment methods are accepted for 93LC66AXT-E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93LC66AXT-E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93LC66AXT-E/SN?
93LC66AXT-E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93LC66AXT-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 93LC66AXT-E/SN?
For technical support, including 93LC66AXT-E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93LC66AXT-E/SN requirements.
6.How does Aetrix verify that 93LC66AXT-E/SN is sourced from the original manufacturer or authorized distributors?
All 93LC66AXT-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 93LC66AXT-E/SN meets industry standards.
7.What is the process for return or replacement of 93LC66AXT-E/SN?
All 93LC66AXT-E/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93LC66AXT-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 93LC66AXT-E/SN part is unused and in its original packaging.
Return procedure for 93LC66AXT-E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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