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STMicroelectronics M93C66-RMN3TP/K
- Part No.:
- M93C66-RMN3TP/K
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M93C66-RMN3TP/K.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:16,262
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Product details
Overview
M93C66-RMN3TP/K from STMicroelectronics is an automotive-grade 4-Kbit MICROWIRE™ serial EEPROM with dual x8/x16 organization, 1.8–5.5 V single-supply operation, and AEC-Q100 Grade 1 qualification for -40 °C to +125 °C environments. It supports byte/word write in ≤4 ms, features READY/BUSY signaling on Q pin, and delivers 4 million write cycles at 25 °C - used in engine control units for calibration storage and fault log retention.
For engineers reviewing the M93C66-RMN3TP/K datasheet, M93C66-RMN3TP/K pinout, M93C66-RMN3TP/K application, or M93C66-RMN3TP/K equivalent, key selection criteria include MICROWIRE™ protocol compatibility, 125 °C operational reliability, SO8 narrow (MN) package footprint, and byte-vs-word addressing flexibility via ORG pin configuration.
Technical Context
The M93C66-RMN3TP/K implements a synchronous serial interface using MICROWIRE™ protocol with start-bit–driven instruction framing, supporting READ, WRITE, WEN, WDS, ERASE, ERAL, and WRAL commands. Its internal address counter auto-increments during sequential reads and wraps at boundary, enabling continuous data streaming without host address management.
It integrates Power-on Reset (POR) circuitry that inhibits instruction execution until VCC exceeds threshold, plus internal voltage monitoring to block writes during brown-out. The ORG pin selects memory organization statically: tied to VSS for 512-byte (x8) mode, or left open/VCC for 256-word (x16) mode - affecting address bit count (9 vs. 8) and instruction clock cycle count (20 vs. 27).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (4096 bits), configurable as 512 × 8-bit bytes or 256 × 16-bit words |
| Write time | ≤4 ms per byte or word - enables fast firmware parameter updates without blocking host MCU |
| Supply voltage | 1.8 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level shifters |
| Operating temperature | -40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood automotive use |
| Endurance | 4 million write cycles at 25 °C - ensures >10-year field reliability in infotainment configuration storage |
| Data retention | 50 years at 125 °C - guarantees calibration data integrity over full vehicle lifecycle in high-temp environments |
| Clock rate | Up to 2 MHz - allows efficient bulk read/write within tight real-time scheduling windows |
| Interface protocol | MICROWIRE™ (3-wire: S, C, D/Q) - minimal GPIO usage and deterministic timing vs. SPI variants |
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 high during instruction execution; pulled low between operations to deselect device |
| C | Serial Clock Input | Synchronous edge-triggered timing reference; rising edge samples D and shifts Q; stops safely during write |
| D | Serial Data Input | Carries instruction op-code, address, and write data; sampled on rising C edge; high-impedance when not selected |
| Q | Serial Data Output | Outputs read data MSB-first; asserts BUSY (low) during write/erase when S is high; tri-stated when S is low |
| ORG | Organization Select Input | Configures x8 (VSS) or x16 (open/VCC) memory mapping; sets address width and instruction length |
| VCC | Supply Voltage | 1.8–5.5 V power rail; requires local 10–100 nF decoupling capacitor near pin |
| VSS | Ground | Reference return path; must be low-impedance connection shared with MCU ground plane |
| DU | Do Not Use | No functional role; reserved for ST test; may be left floating, tied to VCC, or tied to VSS |
Key Features
| Feature | Design Value |
|---|---|
| READY/BUSY signaling | Real-time status feedback on Q pin during programming - eliminates polling delay and enables precise timing of next command |
| Dual memory organization | Hardware-selectable x8 or x16 mode via ORG pin - preserves PCB layout across multiple density variants in same footprint |
| Power-on Write Protection | Integrated POR circuit blocks all write/erase until VCC stabilizes - prevents corruption during cold crank or battery transients |
| Enhanced ESD protection | Robustness against ≥4 kV HBM - reduces need for external TVS diodes in automotive wiring harness interfaces |
| Sequential read streaming | Auto-incrementing address counter with wraparound - enables zero-overhead bulk reads of calibration tables or event logs |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Storing adaptive fuel trim values, misfire counters, and diagnostic trouble codes (DTCs) across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed asynchronously by MCU during idle periods or post-fault shutdown sequences. Use Value: 125 °C rating ensures data integrity during prolonged under-hood thermal soak; 4 million endurance supports daily reprogramming over 10+ years. |
Use Scenario: Retaining camera calibration offsets, radar sensor alignment data, and lane-departure thresholds after power-down. IC Role / Device Role / Timing Role: Configuration store initialized at boot and updated only during factory calibration or OTA software updates. Use Value: Dual x8/x16 organization allows compact storage of 16-bit sensor offsets while minimizing instruction overhead in safety-critical boot code. |
| Body Control Module (BCM) | Infotainment System |
|
Use Scenario: Saving user preferences (seat position, mirror angle, lighting profiles) and door lock programming states. IC Role / Device Role / Timing Role: Low-power standby memory accessed via short burst writes during button press events or CAN message triggers. Use Value: 1.8 V minimum supply enables direct connection to 2.5 V or 3.3 V domain regulators, reducing BOM cost versus level-shifted alternatives. |
Use Scenario: Holding audio equalizer presets, Bluetooth pairing IDs, and display brightness history across soft resets. IC Role / Device Role / Timing Role: Background storage peripheral managed by application processor during idle CPU cycles. Use Value: 2 MHz clock rate supports rapid loading of 512-byte EQ tables in <1 ms - imperceptible to end-user during UI transitions. |
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, 100-year retention at 85 °C | Requires SPI quad mode support; higher density but no x8/x16 flexibility; lacks AEC-Q100 Grade 1 certification | Select if migrating to SPI-based architecture and requiring faster random access; not drop-in compatible |
| M95M04-DWDW6TP/K | 4 Mbit SPI EEPROM, same SO8 package, 1.8–5.5 V, AEC-Q100 Grade 1, but no MICROWIRE™ or ORG pin | Uses standard SPI protocol instead of MICROWIRE™; fixed 8-bit addressing; no hardware organization selection | Choose for legacy SPI designs needing automotive qualification; incompatible with existing MICROWIRE™ firmware stack |
Compared with AT25DF041A-SSH-T and M95M04-DWDW6TP/K, the M93C66-RMN3TP/K uniquely provides MICROWIRE™ protocol compliance, hardware-configurable x8/x16 organization, and guaranteed 125 °C operation - making it irreplaceable in legacy automotive platforms constrained by pin-count, protocol, and thermal requirements.
Availability
M93C66-RMN3TP/K is available at Aetrix Electronics and suitable for engine control units, ADAS sensors, body control modules, and infotainment systems requiring stable component supply across extended automotive lifecycles.
Supply support for M93C66-RMN3TP/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 ICs, sensors, and memory solutions for automotive, industrial, and consumer markets.
The M93Cx6-A125 product line delivers automotive-qualified serial EEPROMs optimized for calibration storage, fault logging, and configuration retention in harsh-temperature electronic control units.
FAQ
What is the function of the ORG pin on the M93C66-RMN3TP/K?
The ORG pin configures memory organization: tied to VSS selects 512-byte (x8) mode; left open or tied to VCC selects 256-word (x16) mode. This determines address bit count (9 vs. 8), instruction clock cycles (20 vs. 27), and data width per READ/WRITE operation - no software reconfiguration is possible after power-up.
Does the M93C66-RMN3TP/K require external pull-up resistors on its I/O lines?
Yes - a 100 kΩ pull-down resistor on the S (Chip Select) line is mandatory per datasheet Section 2 to prevent spurious selection during MCU reset or high-impedance states. No pull-up is required on C or D; Q is actively driven and tri-stated when S is low, so no external termination is needed unless bus contention occurs with multiple devices.
How does the READY/BUSY signal operate during a write cycle?
When S is held high during programming, the Q pin outputs LOW (BUSY) until the internal write completes (~4 ms), then returns HIGH (READY). This occurs regardless of ongoing clock activity on C - allowing the host MCU to halt and resume other tasks without polling delays or fixed timeout assumptions.
Can the M93C66-RMN3TP/K be used in non-automotive applications?
Yes - its 1.8–5.5 V supply range, -40 °C to +125 °C rating, and robust ESD protection make it suitable for industrial PLCs, medical diagnostics equipment, and aerospace avionics where extended temperature operation and long-term data retention are critical - though AEC-Q100 qualification specifically validates automotive stress profiles.
M93C66-RMN3TP/K 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:
- 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-SOIC
M93C66-RMN3TP/K FAQ
1.How can I place an order for M93C66-RMN3TP/K through Aetrix?
Please submit a Request for Quotation (RFQ) for M93C66-RMN3TP/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-RMN3TP/K reliable?
The price and inventory of M93C66-RMN3TP/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-RMN3TP/K is usually 5 days.
3.What payment methods are accepted for M93C66-RMN3TP/K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M93C66-RMN3TP/K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M93C66-RMN3TP/K?
M93C66-RMN3TP/K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M93C66-RMN3TP/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-RMN3TP/K?
For technical support, including M93C66-RMN3TP/K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M93C66-RMN3TP/K requirements.
6.How does Aetrix verify that M93C66-RMN3TP/K is sourced from the original manufacturer or authorized distributors?
All M93C66-RMN3TP/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-RMN3TP/K meets industry standards.
7.What is the process for return or replacement of M93C66-RMN3TP/K?
All M93C66-RMN3TP/K units undergo pre-shipment inspection (PSI). If there is an issue with M93C66-RMN3TP/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-RMN3TP/K part is unused and in its original packaging.
Return procedure for M93C66-RMN3TP/K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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