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STMicroelectronics M93C66-WDW6TP
- Part No.:
- M93C66-WDW6TP
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
M93C66-WDW6TP.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:18,240
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Product details
Overview
M93C66-WDW6TP from STMicroelectronics is a 4-Kbit MICROWIRE™-interface serial EEPROM with dual x8/x16 organization, operating from 2.5 V to 5.5 V supply and supporting up to 2 MHz clock frequency. It delivers byte/word/page write within 5 ms, features READY/BUSY signaling, and is rated for -40 °C to +85 °C operation in SO8N package - used for configuration storage in industrial controllers and embedded boot loaders.
For engineers reviewing the M93C66-WDW6TP datasheet, M93C66-WDW6TP pinout, M93C66-WDW6TP application, or M93C66-WDW6TP equivalent, key selection criteria include its 4-Million write endurance, 200-year data retention, ORG-selectable memory width, and built-in clock pulse counter for noise immunity in noisy MCU interfaces.
Technical Context
The M93C66-WDW6TP implements a static CMOS MICROWIRE™ bus interface with start-bit–driven instruction framing, supporting seven commands (READ, WRITE, WEN, WDS, ERASE, ERAL, WRAL). Its dual-organization architecture uses the ORG pin to select between 512-byte (x8) or 256-word (x16) addressing modes.
Internal logic includes a power-on reset (POR) circuit that prevents spurious writes during power-up, a clock pulse counter that validates instruction bit count before execution, and a READY/BUSY status output on Q pin synchronized to S high. All write operations are self-timed and automatically preceded by erase.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4096 bits = 512 bytes (x8) or 256 words (x16) |
| Interface | MICROWIRE™ serial bus: 4-wire (S, C, D, Q) + ORG control |
| Supply voltage | 2.5 V to 5.5 V - supports legacy 3.3 V and 5 V systems without level shifters |
| Write cycle time | ≤5 ms per byte/word/page - enables fast firmware parameter updates |
| Endurance | 4 million write cycles at 25°C - suitable for logging or calibration data with frequent updates |
| 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 ESD events |
Pinout & Package
Package: SO8N (150 mil width), ECOPACK2-compliant, surface-mount plastic small-outline package with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Must be stable ≥2.5 V; decoupling capacitor (10–100 nF) required near pin |
| VSS | Ground reference | Return path for all I/O and internal logic; low-impedance connection essential |
| S | Chip Select | Active-high enable; must be held high for full instruction duration; pulled low during power-up |
| C | Serial Clock | Input clock edge-triggered (rising); max 2 MHz; external pull-down recommended if MCU enters Hi-Z |
| D | Serial Data Input | Instruction/address/data input sampled on rising C edge; start bit = '1' |
| Q | Serial Data Output / BUSY | Read data output (MSB-first) or BUSY=0/READY=1 status when S=high during programming |
| ORG | Organization Select | Connect to VSS for x8 mode (512 bytes), VCC or open for x16 mode (256 words) |
| DU | Do Not Use | No functional role; may be left floating, tied to VCC, or tied to VSS per design preference |
Key Features
| Feature | Design Value |
|---|---|
| Programmable organization | x8 or x16 via hardware ORG pin - eliminates need for software reconfiguration |
| Self-timed write/erase | No external timing control needed; BUSY/READY on Q pin simplifies MCU polling logic |
| Instruction integrity check | On-chip clock pulse counter aborts invalid instructions - prevents corruption from noise-induced bit shifts |
| Power-up write protection | Integrated POR holds device in standby until VCC exceeds threshold - blocks accidental writes at power ramp |
| ECOPACK2 compliance | Halogen-free, RoHS-compliant packaging - meets industrial environmental compliance requirements |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) Trim Settings |
|---|---|
Use Scenario: Storing calibrated sensor offsets, I/O mapping, and user-defined logic parameters in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed at startup and during field updates via MCU SPI-like MICROWIRE™ interface. Use Value: Dual x8/x16 organization allows compact storage of either ASCII strings (x8) or 16-bit calibration coefficients (x16) without memory fragmentation. | Use Scenario: Retaining seat/mirror position presets, lighting profiles, and door lock preferences across ignition cycles. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced to 8-bit automotive MCU; accessed only during initialization or user adjustment. Use Value: 4-million write endurance supports daily user adjustments over 10+ years; 200-year retention ensures data survival beyond vehicle lifetime. |
| Medical Infusion Pump Calibration Tables | Smart Energy Meter Firmware Parameters |
Use Scenario: Holding flow-rate correction factors, motor step compensation, and safety thresholds updated during service calibration. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory accessed exclusively by authenticated service tools via dedicated serial port. Use Value: Built-in WEN/WDS instruction locking prevents unauthorized writes; READY/BUSY signaling guarantees atomic update completion before system resume. | Use Scenario: Storing tariff schedules, metering constants, and communication keys in utility-grade electricity meters deployed for >15 years. IC Role / Device Role / Timing Role: Long-life configuration store interfaced to metrology SoC; read at boot, written only during firmware upgrades or utility remote commands. Use Value: 200-year data retention at 55°C exceeds IEC 62056-21 thermal aging requirements; 2.5–5.5 V range accommodates wide-input DC-DC outputs. |
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 | 4-Kbit SPI interface (not MICROWIRE™); no ORG pin; fixed x8 organization | Lacks hardware-configurable word width; requires software address remapping for 16-bit data | Select if existing design uses SPI peripherals and does not require dual-width flexibility |
| M93C66-RMN6TP | Same die, but 1.8–5.5 V supply range; TSSOP8 package; identical pinout and instruction set | Enables direct replacement in low-voltage (1.8 V) systems; same footprint but different thermal profile | Select for battery-powered or ultra-low-power designs where 1.8 V operation is mandatory |
Compared with AT25040B-SSHL-T, M93C66-WDW6TP offers hardware-selectable memory width and MICROWIRE™ compatibility for legacy controllers; compared with M93C66-RMN6TP, it trades wider voltage tolerance (2.5–5.5 V) for higher noise immunity in industrial 5 V rails.
Availability
M93C66-WDW6TP is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, medical device calibration, and smart metering applications requiring stable component supply, long-term data integrity, and drop-in compatibility with legacy MICROWIRE™ designs.
Supply support for M93C66-WDW6TP 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 ICs, sensors, and memory products for industrial, automotive, and consumer markets.
The M93Cxx series was developed specifically for reliable, low-pin-count serial configuration storage in resource-constrained embedded systems - emphasizing noise immunity, long data retention, and flexible memory access without external logic.
FAQ
What is the function of the ORG pin on M93C66-WDW6TP?
The ORG pin selects memory organization: tied to VSS for 512-byte (x8) mode, or left open/tied to VCC for 256-word (x16) mode. This hardware configuration avoids software overhead and ensures deterministic addressing at power-up. The pin must be statically set before any instruction - dynamic switching during operation is not supported.
Does M93C66-WDW6TP require external pull-up or pull-down resistors?
Yes - a pull-down resistor on the S (Chip Select) line is strongly recommended to prevent spurious selection during MCU reset or Hi-Z states. An optional pull-down on C (Clock) is advised if the controller can enter Hi-Z on both S and C simultaneously, ensuring tSLCH timing compliance and avoiding unintended writes.
How is write completion detected on M93C66-WDW6TP?
Write completion is signaled via the Q pin: when S is high during programming, Q = 0 indicates BUSY and Q = 1 indicates READY. This eliminates need for fixed delay loops - MCU can poll Q synchronously with S high, then issue next command immediately upon detecting Q = 1.
Can M93C66-WDW6TP be used with modern microcontrollers lacking native MICROWIRE™ support?
Yes - its 4-wire protocol (S, C, D, Q) is bit-bang compatible with any GPIO-capable MCU. No special peripheral is required; standard SPI hardware can often emulate it with minor clock polarity/phase tuning, though official MICROWIRE™ timing (start-bit framing, no CS auto-deassert) must be replicated in firmware.
M93C66-WDW6TP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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-TSSOP
M93C66-WDW6TP FAQ
1.How can I place an order for M93C66-WDW6TP through Aetrix?
Please submit a Request for Quotation (RFQ) for M93C66-WDW6TP 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-WDW6TP reliable?
The price and inventory of M93C66-WDW6TP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M93C66-WDW6TP is usually 5 days.
3.What payment methods are accepted for M93C66-WDW6TP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M93C66-WDW6TP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M93C66-WDW6TP?
M93C66-WDW6TP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M93C66-WDW6TP 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-WDW6TP?
For technical support, including M93C66-WDW6TP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M93C66-WDW6TP requirements.
6.How does Aetrix verify that M93C66-WDW6TP is sourced from the original manufacturer or authorized distributors?
All M93C66-WDW6TP 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-WDW6TP meets industry standards.
7.What is the process for return or replacement of M93C66-WDW6TP?
All M93C66-WDW6TP units undergo pre-shipment inspection (PSI). If there is an issue with M93C66-WDW6TP, 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-WDW6TP part is unused and in its original packaging.
Return procedure for M93C66-WDW6TP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M93C66-WDW6TP Tags
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