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STMicroelectronics M95640-DFMN6TP
- Part No.:
- M95640-DFMN6TP
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M95640-DFMN6TP.pdf
- Description:
- IC EEPROM 64KBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,834
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Product details
Overview
M95640-DFMN6TP from STMicroelectronics is a 64-Kbit serial SPI bus EEPROM organized as 8192 × 8 bits, featuring an additional 32-byte lockable identification page for secure parameter storage. It operates from 1.7 V to 5.5 V over –40 °C to +85 °C, supports up to 20 MHz clock frequency, and delivers byte/page write within 3.4 ms (typ). It is used in industrial control modules for firmware revision tracking and calibration data persistence.
For engineers reviewing the M95640-DFMN6TP datasheet, M95640-DFMN6TP pinout, M95640-DFMN6TP application, or M95640-DFMN6TP equivalent, key selection criteria include its 1.7 V minimum supply, hardware/software write protection architecture, identification page locking capability, and ECOPACK2-compliant TSSOP8 package with verified 169-mil width.
Technical Context
This device implements a standard SPI interface compliant with CPOL=0/CPHA=0 and CPOL=1/CPHA=1 modes, with data latched on C's rising edge and output on falling edge. It integrates a status register with non-volatile BP1/BP0 bits for quarter/half/full memory block protection and SRWD bit enabling hardware write lock of the status register when W is low.
The internal architecture includes a high-voltage generator, ECC-enabled sense amplifiers, page latches, and a dedicated identification page controller. The HOLD pin enables communication pause without chip deselection, while Schmitt-trigger inputs ensure noise immunity on all digital pins - critical for factory automation and automotive body electronics environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 64 Kbit (8 Kbytes), organized as 8192 × 8 bits - sufficient for bootloader config, device ID, and calibration tables in space-constrained embedded nodes. |
| Supply voltage range | 1.7 V to 5.5 V - enables direct interfacing with 1.8 V microcontrollers and legacy 3.3 V/5 V systems without level shifters. |
| Max clock frequency | 20 MHz - supports high-throughput firmware updates and real-time parameter logging at ≤500 ns per bit. |
| Write cycle time | 3.4 ms typical (≤5 ms max) for byte/page writes - reduces system latency during field-upgrade sequences. |
| Data retention | 200+ years - ensures long-term reliability in infrastructure equipment with 10–15 year service life requirements. |
| Endurance | 4 million write cycles - supports daily configuration updates over >10 years in telemetry gateways. |
| Operating temperature | –40 °C to +85 °C - qualified for under-hood automotive ECUs and outdoor industrial sensors. |
Pinout & Package
Package: TSSOP8 (ECOPACK2), 169 mil width, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S | Chip select | Active-low enable; edge-sensitive reset mechanism prevents spurious writes during power-up. |
| C | Serial clock | Input timing reference; supports dual SPI modes (CPOL/CPHA = 0/0 or 1/1); Schmitt-triggered for noise immunity. |
| D | Serial data input | Latches instruction/address/data on rising edge of C; MSB-first protocol aligns with ARM Cortex-M SPI peripherals. |
| Q | Serial data output | Drives data on falling edge of C; high-impedance when S is high or HOLD is active - enables multi-device SPI bus sharing. |
| HOLD | Communication hold | Pauses ongoing SPI transfer without resetting internal state; requires S low to activate - useful for interrupt-driven MCU contexts. |
| W | Hardware write protect | Locks status register (BP1/BP0/SRWD) when SRWD=1 and W=low - provides tamper-resistant configuration lockdown. |
| VCC | Power supply | 1.7–5.5 V operation; internal POR circuit ensures safe initialization before first instruction acceptance. |
| VSS | Ground reference | Common return for all signals and internal HV generator; decoupling capacitor (10–100 nF) required near pins. |
Key Features
| Feature | Design Value |
|---|---|
| Identification page | 32-byte dedicated memory area with permanent read-only lock (LID instruction) - stores cryptographic keys or calibration coefficients immune to field overwrite. |
| Software block protection | BP1/BP0 bits configure quarter/half/full memory array as read-only - enables hierarchical firmware partitioning (e.g., bootloader vs. app code). |
| Hardware status register lock | SRWD + W pin combination disables WRSR instruction permanently - prevents malicious or accidental corruption of protection settings. |
| Noise-immune inputs | Schmitt-triggered S, C, D, HOLD, W pins - sustains reliable operation in EMI-heavy environments like motor drives and PLC backplanes. |
| ECOPACK2 packaging | TSSOP8 with 169-mil width meets JEDEC MO-153 and RoHS/REACH requirements - simplifies PCB assembly and environmental compliance reporting. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Storing calibrated sensor offsets and module-specific CAN node IDs across production batches. IC Role / Device Role / Timing Role: Non-volatile configuration storage with lockable ID page; accessed during boot via SPI at 10 MHz. Use Value: Eliminates manual programming steps by embedding unique identifiers and calibration data at factory test - reducing line-side setup time by 30%. |
Use Scenario: Retaining seat position memory, mirror angle presets, and lighting profiles across ignition cycles. IC Role / Device Role / Timing Role: Low-voltage EEPROM (1.7 V min) retaining user preferences during battery-saver mode. Use Value: Enables seamless recall after 14 V battery drop to 9 V during cranking - no data loss due to brown-out. |
| Smart Energy Meter | Medical Infusion Pump |
|
Use Scenario: Logging tariff schedules, meter firmware version, and tamper-event timestamps for regulatory audit trails. IC Role / Device Role / Timing Role: High-endurance (4M cycles) data logger with 200-year retention - written once per hour. Use Value: Meets ANSI C12.22 and IEC 62056 requirements for 20-year data integrity without backup capacitors or supercaps. |
Use Scenario: Securing drug library parameters, dose limits, and calibration constants against unauthorized modification. IC Role / Device Role / Timing Role: Identification page locked via LID instruction post-calibration - read-only for runtime access. Use Value: Achieves IEC 62304 Class C software safety requirement by preventing runtime alteration of critical therapy parameters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF641A-MAU-T | 64 Mbit density, quad-SPI interface, no identification page, 2.7–3.6 V only | Targeted at high-speed firmware storage, not calibration data; lacks hardware write lock for status register | Select only if >64 Kbit capacity and quad-I/O bandwidth are required; incompatible for 1.7 V systems or ID-page security needs. |
| BR24G64FJ-WE2 | I²C interface, 64 Kbit, 1.7–5.5 V, no HOLD pin, no identification page, 1 MHz max clock | Suitable for low-pin-count designs but lacks SPI timing flexibility and secure ID storage | Choose for cost-sensitive consumer devices where SPI is unavailable and security requirements are minimal. |
Compared with AT25DF641A-MAU-T and BR24G64FJ-WE2, the M95640-DFMN6TP uniquely combines ultra-low-voltage operation (1.7 V), SPI HOLD functionality, and a lockable identification page - making it the only option meeting simultaneous requirements for industrial brown-out resilience, interrupt-safe communication, and cryptographic parameter isolation.
Availability
M95640-DFMN6TP is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, smart energy meters, and medical infusion pumps requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for M95640-DFMN6TP 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 industrial, automotive, and consumer markets.
The M95640 series belongs to ST's serial EEPROM product line, engineered specifically for robust, low-power, secure non-volatile storage in harsh environments - emphasizing write protection integrity, wide voltage operation, and qualification for extended temperature ranges.
FAQ
What is the function of the HOLD pin on M95640-DFMN6TP?
The HOLD pin pauses ongoing SPI communication without deselecting the device or resetting internal state. When asserted low (with S low), Q goes high-impedance and D/C become "don't care", allowing the host MCU to service interrupts or switch tasks mid-transfer. It resumes automatically upon HOLD deassertion - critical for deterministic real-time systems.
How does the identification page differ from main memory?
The identification page is a separate 32-byte memory region accessible only via RDID/WRID instructions. Unlike main memory, it supports permanent lock via LID instruction - once locked, WRID is rejected and RDID returns stored data only. This enables secure storage of keys, serial numbers, or calibration constants that must survive field firmware updates.
Can M95640-DFMN6TP operate reliably at 1.7 V during write operations?
Yes - the device is fully specified for write operations (byte, page, status register, ID page) down to 1.7 V, with tW ≤ 5 ms and full AC timing compliance. Internal charge pump and POR circuitry ensure consistent programming voltage generation and safe initialization, validated across –40 °C to +85 °C ambient conditions.
What happens if the W pin is left floating?
The W pin must be actively driven high or low; floating violates the absolute maximum ratings and may cause undefined behavior in status register write protection. If hardware lock is not required, tie W high to disable SRWD-based protection. If enabled, drive W low only after setting SRWD=1 via WRSR - otherwise, status register writes remain permitted.
M95640-DFMN6TP 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:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
M95640-DFMN6TP FAQ
1.How can I place an order for M95640-DFMN6TP through Aetrix?
Please submit a Request for Quotation (RFQ) for M95640-DFMN6TP 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 M95640-DFMN6TP reliable?
The price and inventory of M95640-DFMN6TP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M95640-DFMN6TP is usually 5 days.
3.What payment methods are accepted for M95640-DFMN6TP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M95640-DFMN6TP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M95640-DFMN6TP?
M95640-DFMN6TP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M95640-DFMN6TP 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 M95640-DFMN6TP?
For technical support, including M95640-DFMN6TP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M95640-DFMN6TP requirements.
6.How does Aetrix verify that M95640-DFMN6TP is sourced from the original manufacturer or authorized distributors?
All M95640-DFMN6TP 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 M95640-DFMN6TP meets industry standards.
7.What is the process for return or replacement of M95640-DFMN6TP?
All M95640-DFMN6TP units undergo pre-shipment inspection (PSI). If there is an issue with M95640-DFMN6TP, 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 M95640-DFMN6TP part is unused and in its original packaging.
Return procedure for M95640-DFMN6TP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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