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STMicroelectronics M93C66-RDW3TP/K
- Part No.:
- M93C66-RDW3TP/K
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
M93C66-RDW3TP/K.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,161
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Product details
Overview
M93C66-RDW3TP/K from STMicroelectronics is an automotive-grade 4-Kbit serial EEPROM with MICROWIRE™ interface, organized as 512 × 8-bit or 256 × 16-bit, operating from 1.8 V to 5.5 V across –40 °C to +125 °C. It delivers byte/word write in ≤4 ms, supports READY/BUSY signaling via Q pin, and features 4 million write cycles at 25 °C for infotainment configuration storage and ECU parameter logging.
For engineers reviewing the M93C66-RDW3TP/K datasheet, M93C66-RDW3TP/K pinout, M93C66-RDW3TP/K application, or M93C66-RDW3TP/K equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, dual x8/x16 organization flexibility, SO8 narrow (MN) package compatibility, and guaranteed data retention of 50 years at 125 °C.
Technical Context
The M93C66-RDW3TP/K implements a synchronous serial MICROWIRE™ bus with three primary control signals: Chip Select (S), Serial Clock (C), and Serial Data I/O (D/Q). Its ORG pin selects memory organization-x8 when tied to VSS, x16 when unconnected or tied to VCC-enabling hardware-configurable data width without firmware changes.
Internal self-timed programming eliminates external timing constraints: after WRITE instruction initiation, the device asserts BUSY on Q while holding S high, and requires no pre-erase cycle. The integrated Power-on Data Protection circuit blocks instruction execution until VCC exceeds POR threshold, preventing spurious writes during power ramp-up or brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 bytes or 256 words), enabling compact nonvolatile storage for calibration tables and fault logs |
| Interface protocol | MICROWIRE™ serial bus (3-wire: S, C, D/Q), reducing PCB routing complexity vs. SPI/I²C |
| Write time | ≤4 ms per byte or word, supporting real-time parameter updates without system stall |
| Supply voltage | 1.8 V to 5.5 V, compatible with 3.3 V and 5 V microcontroller I/O domains |
| Temperature range | –40 °C to +125 °C, qualified to AEC-Q100 Grade 1 for under-hood automotive use |
| Data retention | 50 years at 125 °C, ensuring long-term reliability in high-temperature engine control modules |
| Endurance | 4 million write cycles at 25 °C, sufficient for frequent recalibration in ADAS sensor modules |
Pinout & Package
Package: SO8 narrow (MN), 150 mil body width, RoHS-compliant and Halogen-free (ECOPACK2®).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S | Chip Select Input | Active-low enable; must be held low during instruction execution and high-impedance otherwise to prevent bus contention |
| C | Serial Clock Input | Synchronous edge-triggered clock (max 2 MHz); rising edge samples D and shifts Q |
| D | Serial Data Input | Accepts instruction op-codes, addresses, and write data; sampled on C's rising edge |
| Q | Serial Data Output / BUSY indicator | Outputs read data MSB-first; asserts logic low during internal write/erase to signal BUSY state |
| ORG | Organization Select Input | Configures memory map: x8 (VSS) or x16 (open/VCC); sets standby current optimization point |
| VCC | Supply Voltage | 1.8–5.5 V power rail; requires local 10–100 nF decoupling capacitor near pins |
| VSS | Ground | Reference return path; must be low-impedance and shared with MCU ground plane |
| DU | Do Not Use | Reserved test pin; may be left floating, tied to VCC, or connected to VSS-no functional impact |
Key Features
| Feature | Design Value |
|---|---|
| READY/BUSY signaling | Real-time BUSY status on Q pin enables precise host timing control without polling delays |
| Dual memory organization | Hardware-selectable x8 or x16 mode via ORG pin-eliminates need for software address translation |
| Power-on data protection | Integrated POR circuit blocks all instructions until VCC stabilizes above threshold, preventing corruption |
| Enhanced ESD protection | Robustness against >4 kV HBM ESD events ensures reliability in manufacturing and field environments |
| Sequential read operation | Continuous data stream output with automatic address rollover simplifies firmware buffer management |
Applications
| Instrument Cluster Configuration | Body Control Module (BCM) Settings |
|---|---|
|
Use Scenario: Storing odometer values, trip counters, and user preferences in automotive instrument clusters. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with AEC-Q100 Grade 1 compliance for safety-critical display data. Use Value: 50-year data retention at 125 °C ensures odometer integrity over vehicle lifetime without battery backup. |
Use Scenario: Retaining door lock states, mirror position memory, and lighting profiles in BCMs. IC Role / Device Role / Timing Role: Low-power, high-endurance EEPROM interfaced directly to 3.3 V microcontrollers via MICROWIRE™. Use Value: 4 million write cycles at 25 °C supports daily reconfiguration without wear-out concerns. |
| Engine Control Unit (ECU) Calibration | Advanced Driver Assistance Systems (ADAS) |
|
Use Scenario: Holding fuel injection maps, ignition timing offsets, and sensor compensation coefficients. IC Role / Device Role / Timing Role: High-temperature EEPROM for runtime-accessible calibration data in engine bay environments. Use Value: Guaranteed operation up to +125 °C and 1.8 V minimum supply enables direct placement near ECU MCU. |
Use Scenario: Storing camera alignment parameters, radar offset corrections, and sensor fusion coefficients. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for mission-critical ADAS configuration data. Use Value: Write Enable/Disable protocol prevents accidental overwrites during OTA updates or diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | Quad SPI interface, 4 Mbit density, no ORG pin or x16 mode | Higher bandwidth but incompatible bus protocol; requires MCU SPI driver redesign | Select only if system already uses Quad SPI and needs larger capacity |
| M95M02-RDW6TP/K | 2 Mbit SPI EEPROM, same SO8 package, but lacks READY/BUSY pin and AEC-Q100 Grade 1 rating | Lower temperature grade (–40 °C to +85 °C) limits use to cabin electronics only | Choose for cost-sensitive non-automotive applications where extended temp is unnecessary |
Compared with AT25DF041A-SSH-T and M95M02-RDW6TP/K, the M93C66-RDW3TP/K uniquely combines AEC-Q100 Grade 1 qualification, hardware-configurable x8/x16 organization, and dedicated BUSY signaling-making it the only drop-in solution for legacy MICROWIRE™-based automotive ECUs requiring guaranteed high-temp endurance.
Availability
M93C66-RDW3TP/K is available at Aetrix Electronics and suitable for automotive instrument clusters, body control modules, engine control units, and ADAS calibration systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for M93C66-RDW3TP/K 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 solutions for automotive, industrial, and consumer markets.
The M93Cx6-A125 product line delivers AEC-Q100 Grade 1 serial EEPROMs optimized for automotive subsystems requiring robust nonvolatile storage under extreme thermal and electrical stress.
FAQ
What is the function of the ORG pin on the M93C66-RDW3TP/K?
The ORG pin configures memory organization: tying it to VSS selects 512 × 8-bit (x8) mode; leaving it open or connecting to VCC selects 256 × 16-bit (x16) mode. This hardware-selectable mapping avoids firmware address translation and optimizes standby current-applying intermediate voltages to ORG increases leakage, so VSS or VCC is mandatory for minimal power consumption.
Does the M93C66-RDW3TP/K require an erase cycle before writing?
No. The M93C66-RDW3TP/K performs internal self-timed write operations that automatically erase the target byte or word before programming, eliminating separate ERASE commands for standard WRITE instructions. Only explicit ERASE or ERAL instructions trigger dedicated erase cycles-required only for selective clearing or full-array initialization.
How is BUSY status indicated during a write operation?
During internal programming, the M93C66-RDW3TP/K drives the Q pin low while Chip Select (S) remains high-providing a hardware BUSY signal. Host controllers can monitor Q synchronously with C or poll asynchronously. Once programming completes, Q returns high, signaling readiness for the next instruction without fixed timeout delays.
Is the DU pin required to be connected?
No. The DU (Do Not Use) pin is reserved for STMicroelectronics factory testing and has no functional role in normal operation. It may be left unconnected, tied to VCC, or connected to VSS-none of these configurations affect device behavior, timing, or reliability in end-user applications.
M93C66-RDW3TP/K 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:
- Not 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
M93C66-RDW3TP/K FAQ
1.How can I place an order for M93C66-RDW3TP/K through Aetrix?
Please submit a Request for Quotation (RFQ) for M93C66-RDW3TP/K 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-RDW3TP/K reliable?
The price and inventory of M93C66-RDW3TP/K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M93C66-RDW3TP/K is usually 5 days.
3.What payment methods are accepted for M93C66-RDW3TP/K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M93C66-RDW3TP/K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M93C66-RDW3TP/K?
M93C66-RDW3TP/K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M93C66-RDW3TP/K 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-RDW3TP/K?
For technical support, including M93C66-RDW3TP/K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M93C66-RDW3TP/K requirements.
6.How does Aetrix verify that M93C66-RDW3TP/K is sourced from the original manufacturer or authorized distributors?
All M93C66-RDW3TP/K 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-RDW3TP/K meets industry standards.
7.What is the process for return or replacement of M93C66-RDW3TP/K?
All M93C66-RDW3TP/K units undergo pre-shipment inspection (PSI). If there is an issue with M93C66-RDW3TP/K, 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-RDW3TP/K part is unused and in its original packaging.
Return procedure for M93C66-RDW3TP/K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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