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STMicroelectronics M93S66-WMN6TP
- Part No.:
- M93S66-WMN6TP
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M93S66-WMN6TP.pdf
- Description:
- IC EEPROM 4KBIT SPI 2MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:32,136
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Product details
Overview
M93S66-WMN6TP from STMicroelectronics is a 4 Kbit serial EEPROM organized as 256 words × 16 bits, compatible with the MICROWIRE bus interface, operating from 2.5 V to 5.5 V over −40 °C to +85 °C, featuring page write (≤5 ms), user-defined write protection, and 4 million write cycles - used in industrial sensor calibration storage and embedded system configuration retention.
For engineers reviewing the M93S66-WMN6TP datasheet, M93S66-WMN6TP pinout, M93S66-WMN6TP application, or M93S66-WMN6TP equivalent, key selection criteria include MICROWIRE timing compliance, 16-bit word addressing, programmable protection register, OTP-locked protection capability, and SO8 ECOPACK®2 package compatibility.
Technical Context
The M93S66-W implements a synchronous serial MICROWIRE interface with strict clock-edge sampling: data input (D) latched on rising C edge after S activation, output (Q) updated post-rising C edge during read. It uses an 8-bit address field for 256-word access and supports instruction-based protection register control (PRE, W pins) with flag reporting and OTP locking.
Internal write operations are self-timed with Busy/Ready indication via Q pin while S is high; a clock pulse counter validates instruction length (e.g., 27 cycles for WRITE) to prevent corruption from noise-induced clock glitches. No pre-erase is required before write.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (256 × 16-bit words) - supports compact firmware parameter storage without byte-level fragmentation. |
| Interface | MICROWIRE serial bus - requires only 4 signal lines (S, C, D, Q) and enables simple microcontroller GPIO implementation. |
| Write time | ≤5 ms per byte or page - enables fast field updates without blocking host CPU for extended periods. |
| Supply voltage | 2.5 V to 5.5 V - interoperable with 3.3 V and 5 V logic domains without level-shifting. |
| Data retention | 200 years at 25 °C - ensures long-term reliability in unpowered storage of calibration or security keys. |
| Endurance | 4 million write cycles - suitable for applications requiring frequent reconfiguration (e.g., metering registers). |
| Operating temp | −40 °C to +85 °C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
Package: SO8 (MN), ECOPACK®2, 150 mil body width, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S | Chip select input | Active-low enable: drives device into active mode when low; Q enters high-Z when high. |
| C | Serial clock input | Edge-triggered timing reference: all data sampled on rising edge; supports up to 2 MHz. |
| D | Serial data input | Carries op-code, address, and write data; MSB-first, latched on rising C edge. |
| Q | Serial data output | Outputs read data or protection register contents; also signals BUSY during internal write. |
| PRE | Protection register enable | High-active control for accessing protection register instructions (PRREAD, PRWRITE, etc.). |
| W | Write protect input | Hardware lock: low disables all writes (except protection register if PRE is asserted); must not float. |
| VSS | Ground reference | Return path for VCC; decoupling capacitor (10–100 nF) required near pin for stable operation. |
| VCC | Supply voltage | Single power rail: powers logic and memory array; POR circuit prevents spurious writes during power ramp. |
Key Features
| Feature | Design Value |
|---|---|
| User-defined write protection | Configurable protected area size via 6-bit protection register; enables selective lockdown of critical calibration data. |
| OTP-locked protection register | One-Time Programmable bit permanently fixes protection register content after PRDS command - prevents runtime tampering. |
| Noise-immune instruction validation | On-chip clock pulse counter aborts WRITE/PAWRITE/WRAL/PRWRITE/PRCLEAR if cycle count mismatches - eliminates glitch-induced corruption. |
| Page write capability | Writes up to 4 consecutive 16-bit words (64 bits) in one ≤5 ms cycle - improves bulk update efficiency vs. byte-by-byte. |
| Standby current | Typical 1 µA at 5.5 V - minimizes power draw in battery-backed systems during idle periods. |
Applications
| Industrial Sensor Calibration | Smart Meter Configuration Storage |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for temperature, pressure, and humidity sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter repository accessed at boot; retains values across power cycles and firmware updates. Use Value: Eliminates need for external trimming components; enables field recalibration via secure write-protected interface. | Use Scenario: Holding tariff tables, billing counters, and communication protocol settings in electricity/water meters with tamper resistance. IC Role / Device Role / Timing Role: Secure configuration store with hardware write disable (W pin) and OTP-locked protection register. Use Value: Prevents unauthorized modification of revenue-critical parameters while allowing authorized updates via PRE-controlled commands. |
| Automotive Body Control Module | Medical Device Setup Profiles |
Use Scenario: Saving seat/mirror position presets, lighting behavior modes, and door lock configurations in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Low-voltage EEPROM interfaced directly to 3.3 V MCU; operates reliably across cold-crank (2.5 V) to load-dump (5.5 V) conditions. Use Value: Ensures user preferences persist through ignition cycles and battery disconnects without external voltage supervision. | Use Scenario: Storing FDA-compliant device initialization profiles (e.g., infusion pump flow rates, alarm thresholds) requiring audit-trail integrity. IC Role / Device Role / Timing Role: Tamper-evident nonvolatile memory with 200-year data retention and 4M-cycle endurance for repeated clinical recalibration. Use Value: Meets IEC 62304 software lifecycle requirements by guaranteeing parameter persistence across device service life. |
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 (not MICROWIRE); 4 Kbit, 512 × 8-bit organization; no protection register or OTP lock. | Lacks hardware write protection granularity and noise-immune instruction validation - requires software-managed protection. | Select only if SPI-native MCU integration outweighs need for robust hardware protection and glitch immunity. |
| M95040-WMN6TP | Same manufacturer, SPI interface variant; identical SO8 package and voltage/temp specs; includes enhanced write protection but no PRE/W dual-pin scheme. | Uses single WP pin instead of PRE+W; protection register accessible only via SPI commands - less deterministic in noisy environments. | Prefer when migrating legacy designs from MICROWIRE to SPI; not drop-in compatible due to protocol and pin function differences. |
Compared with AT25040B-SSHL-T and M95040-WMN6TP, the M93S66-WMN6TP uniquely delivers MICROWIRE-native timing, dual-pin hardware write protection (W+PRE), and clock-cycle validation - making it optimal for safety-critical or electrically noisy industrial control nodes where instruction integrity is non-negotiable.
Availability
M93S66-WMN6TP is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for M93S66-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 ICs, sensors, and memory products for industrial, automotive, and consumer markets.
The M93S66-W belongs to ST's serial EEPROM product line, engineered specifically for reliable, low-power, noise-resilient nonvolatile storage in resource-constrained embedded systems using legacy or cost-optimized MICROWIRE interfaces.
FAQ
What is the maximum clock frequency supported by the M93S66-WMN6TP?
The M93S66-WMN6TP supports a maximum serial clock (C) frequency of 2 MHz across its full operating voltage range (2.5 V to 5.5 V) and temperature range (−40 °C to +85 °C), as specified in Table 11 of the official datasheet (DocID5124 Rev 7). This timing allows direct interfacing with most 8-/16-bit MCUs without clock division.
How does the protection register interact with the W and PRE pins?
The W pin provides hardware-level write disable: when low, all memory writes are blocked regardless of protection register state. The PRE pin must be high to execute protection register instructions (PRREAD, PRWRITE, PRCLEAR, PRDS). Protection register content defines which address ranges are locked, and PRDS permanently sets the OTP bit to freeze that configuration.
Can the M93S66-WMN6TP be used with a 3.3 V microcontroller without level shifters?
Yes - the M93S66-WMN6TP operates natively from 2.5 V to 5.5 V, and its input thresholds (VIL = 0.3×VCC, VIH = 0.7×VCC) ensure reliable logic recognition from standard 3.3 V CMOS outputs. Its output VOH/VOL levels also meet 3.3 V interface requirements, eliminating need for external level translation.
Is there a difference between M93S66-W and M93S66-WMN6TP in functionality or specification?
No functional or electrical difference exists: "MN6TP" denotes the specific packaging and tape-and-reel ordering code - SO8 (MN), ECOPACK®2, 150 mil width, 6 mm tape width, and 3,000-unit reel quantity. All electrical, timing, and functional specifications match the base M93S66-W device defined in DocID5124 Rev 7.
M93S66-WMN6TP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 256 x 16
- Memory Interface:
- SPI
- 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
M93S66-WMN6TP FAQ
1.How can I place an order for M93S66-WMN6TP through Aetrix?
Please submit a Request for Quotation (RFQ) for M93S66-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 M93S66-WMN6TP reliable?
The price and inventory of M93S66-WMN6TP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M93S66-WMN6TP is usually 5 days.
3.What payment methods are accepted for M93S66-WMN6TP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M93S66-WMN6TP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M93S66-WMN6TP?
M93S66-WMN6TP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M93S66-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 M93S66-WMN6TP?
For technical support, including M93S66-WMN6TP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M93S66-WMN6TP requirements.
6.How does Aetrix verify that M93S66-WMN6TP is sourced from the original manufacturer or authorized distributors?
All M93S66-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 M93S66-WMN6TP meets industry standards.
7.What is the process for return or replacement of M93S66-WMN6TP?
All M93S66-WMN6TP units undergo pre-shipment inspection (PSI). If there is an issue with M93S66-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 M93S66-WMN6TP part is unused and in its original packaging.
Return procedure for M93S66-WMN6TP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M93S66-WMN6TP Tags
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