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STMicroelectronics M93C66-WMN6TP
- Part No.:
- M93C66-WMN6TP
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M93C66-WMN6TP.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,451
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Product details
Overview
M93C66-WMN6TP from STMicroelectronics is a 4-Kbit serial EEPROM with MICROWIRE™ interface, configurable as 512 bytes (x8) or 256 words (x16), operating from 2.5 V to 5.5 V supply at up to 2 MHz clock frequency, and rated for -40 °C to +85 °C industrial temperature range. It delivers byte/word/page write within 5 ms, supports READY/BUSY signaling, and is used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.
For engineers reviewing the M93C66-WMN6TP datasheet, M93C66-WMN6TP pinout, M93C66-WMN6TP application, or M93C66-WMN6TP equivalent, key selection considerations include its dual x8/x16 organization select via ORG pin, 4 million write cycles at 25°C, 200-year data retention, SO8N package compatibility, and MICROWIRE™ bus timing compliance per DS1077 Rev 20.
Technical Context
The M93C66-WMN6TP implements a static CMOS-based serial EEPROM architecture with on-chip clock pulse counter for noise immunity and hardware-level write protection via WEN/WDS instructions. Its memory array is accessed through a 3-wire MICROWIRE™ protocol (S, C, D/Q) with dedicated ORG input determining x8 or x16 addressing mode.
It features an internal power-on reset (POR) circuit that prevents spurious writes during power-up, and uses a self-timed internal programming cycle triggered by falling edge of Chip Select (S) after valid instruction framing - eliminating dependency on external clock during write/erase operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4096 bits (512 × 8-bit bytes or 256 × 16-bit words) |
| Interface | MICROWIRE™ 3-wire serial (S, C, D/Q), no SPI or I²C compatibility |
| Supply voltage | 2.5 V to 5.5 V - enables direct integration with 3.3 V and 5 V logic systems |
| Max clock frequency | 2 MHz - supports high-speed configuration reads without requiring MCU wait states |
| Write endurance | 4,000,000 cycles at 25°C - suitable for frequent runtime parameter logging |
| Data retention | 200 years at 55°C - ensures long-term reliability in sealed industrial enclosures |
| ESD rating | 4000 V HBM - robust against handling and board-level electrostatic discharge |
Pinout & Package
Package: SO8N (150 mil width), ECOPACK2-compliant, surface-mount 8-pin small outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Must be stable within 2.5–5.5 V; decoupling capacitor (10–100 nF) required near pin |
| VSS | Ground reference | Return path for all digital and internal circuitry; low-impedance connection essential |
| S | Chip Select | Active-high enable; must be driven low before next clock rising edge to initiate write cycle |
| C | Serial Clock | Input clock synchronized to data edges; sampling occurs on rising edge |
| D | Serial Data Input | Accepts start bit, op-code, address, and data; sampled on rising clock edge |
| Q | Serial Data Output / READY-BUSY | Outputs read data MSB-first; asserts Q=0 during programming to signal BUSY state |
| ORG | Organization Select | Connect to VSS for x8 mode (512-byte), leave open or tie to VCC for x16 mode (256-word) |
| DU | Do Not Use | No functional role; may be left floating, tied to VCC, or tied to VSS per design convenience |
Key Features
| Feature | Design Value |
|---|---|
| Dual memory organization | Selectable x8 (byte) or x16 (word) addressing via ORG pin - simplifies alignment with MCU data bus width |
| READY/BUSY signaling | Q pin outputs logic 0 during internal write/erase - eliminates need for fixed delay timing in host firmware |
| Hardware write protection | WEN/WDS instructions enforce explicit enable/disable of erase/write - prevents accidental overwrites during power transients |
| Noise-immune clock counter | Aborts invalid WRITE/ERASE if clock pulse count mismatches expected value - ensures instruction integrity in EMI-prone environments |
| Static operation | Supports 0 Hz (DC) clock input - allows ultra-low-power suspend modes without losing bus synchronization |
Applications
| Industrial Sensor Calibration Storage | Embedded System Configuration Backup |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile configuration register accessed during boot; retains values across power cycles and field updates. Use Value: Eliminates need for external calibration trimmers; enables field recalibration via simple serial command without firmware update. | Use Scenario: Saving user-modified UI settings, network parameters, and operational thresholds in medical diagnostic equipment. IC Role / Device Role / Timing Role: Dedicated parameter store isolated from main flash; accessed only during initialization or settings change. Use Value: Prevents corruption of critical setup data during unexpected resets; supports >4M rewrites over product lifetime. |
| Automotive Body Control Module (BCM) Trim Data | Smart Meter Firmware Parameter Vault |
Use Scenario: Holding door lock actuator timing offsets and mirror position presets in automotive BCMs operating at -40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-stable EEPROM interfaced directly to 8-bit microcontroller via MICROWIRE™ bus. Use Value: Meets AEC-Q100 ambient temp requirement; 200-year retention ensures data integrity over full vehicle service life. | Use Scenario: Securing tariff schedules, billing multipliers, and communication keys in utility smart meters deployed in outdoor cabinets. IC Role / Device Role / Timing Role: Tamper-resistant configuration vault with hardware write disable; accessed only during secure firmware update sessions. Use Value: ESD-hardened (4 kV HBM) pins withstand field maintenance; dual organization supports both legacy 8-bit and modern 16-bit metering ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25040B-SSHL-T | SPI interface (4-wire), 4-Kbit, 1.8–5.5 V, 20 MHz max clock | Requires SPI-capable MCU; lacks ORG-selectable x8/x16 mode | Choose when higher throughput (20 MHz vs 2 MHz) and SPI ecosystem support are prioritized over MICROWIRE™ compatibility |
| M93C56-WMN6TP | 2-Kbit capacity, identical SO8N package, same MICROWIRE™ protocol and timing | Half memory depth; suitable where configuration footprint is constrained and 256-byte limit suffices | Choose for cost-sensitive designs with lower storage demand and existing M93C66 layout - pin-compatible drop-in with reduced density |
Compared with AT25040B-SSHL-T, M93C66-WMN6TP offers deterministic 2 MHz timing and dual organization flexibility but lower speed; compared with M93C56-WMN6TP, it doubles memory while maintaining identical pinout, timing, and software interface - enabling seamless scalability without PCB revision.
Availability
M93C66-WMN6TP is available at Aetrix Electronics and suitable for industrial sensor calibration storage, embedded system configuration backup, and automotive body control module applications requiring stable component supply, long-life data retention, and proven MICROWIRE™ interoperability.
Supply support for M93C66-WMN6TP 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and memory products for industrial, automotive, and consumer markets.
The M93Cxx series targets cost-sensitive, space-constrained embedded systems needing reliable, low-pin-count serial EEPROM with flexible organization and robust noise immunity - optimized for legacy MICROWIRE™-based microcontrollers and long-lifecycle deployments.
FAQ
What is the function of the ORG pin on M93C66-WMN6TP?
The ORG pin selects memory organization: connect to VSS for x8 mode (512 bytes), leave unconnected or tie to VCC for x16 mode (256 words). This determines address width and data bus alignment. During standby, ORG must be fixed at VSS or VCC to minimize quiescent current - floating states increase leakage.
Does M93C66-WMN6TP support SPI or I²C interfaces?
No. M93C66-WMN6TP exclusively supports the 3-wire MICROWIRE™ protocol (S, C, D/Q) and is not electrically or logically compatible with SPI or I²C. It lacks chip select polarity inversion, bidirectional data lines, or repeated start conditions required by those protocols.
How is write protection implemented on M93C66-WMN6TP?
Write protection is enforced via WEN (Write Enable) and WDS (Write Disable) instructions. The device powers up with writes disabled. A WEN instruction must precede any ERASE or WRITE operation; WDS disables further writes until next power cycle or another WEN. This prevents accidental overwrites during power transitions or noise events.
What does the DU pin do on M93C66-WMN6TP?
The DU (Do Not Use) pin has no functional role in normal operation. It is reserved for STMicroelectronics internal test sequences. It may be left unconnected, tied to VCC, or tied to VSS - none affects device behavior. No external circuitry should drive or rely on this pin.
M93C66-WMN6TP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- 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:
- 2 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
M93C66-WMN6TP FAQ
1.How can I place an order for M93C66-WMN6TP through Aetrix?
Please submit a Request for Quotation (RFQ) for M93C66-WMN6TP 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 M93C66-WMN6TP reliable?
The price and inventory of M93C66-WMN6TP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M93C66-WMN6TP is usually 5 days.
3.What payment methods are accepted for M93C66-WMN6TP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M93C66-WMN6TP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M93C66-WMN6TP?
M93C66-WMN6TP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M93C66-WMN6TP 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 M93C66-WMN6TP?
For technical support, including M93C66-WMN6TP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M93C66-WMN6TP requirements.
6.How does Aetrix verify that M93C66-WMN6TP is sourced from the original manufacturer or authorized distributors?
All M93C66-WMN6TP 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 M93C66-WMN6TP meets industry standards.
7.What is the process for return or replacement of M93C66-WMN6TP?
All M93C66-WMN6TP units undergo pre-shipment inspection (PSI). If there is an issue with M93C66-WMN6TP, 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 M93C66-WMN6TP part is unused and in its original packaging.
Return procedure for M93C66-WMN6TP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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