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Home > Products > Integrated Circuits (ICs) > Memory > Memory

STMicroelectronics M95128-RDW6TP

Name: M95128-RDW6TP
Brand: STMicroelectronics
SKU: M95128-RDW6TP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M95128-RDW6TP

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 8-TSSOP (0.173", 4.40mm Width)

Datasheet:: M95128-RDW6TP.pdf

Description:: IC EEPROM 128KBIT SPI 8TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:8,325

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Product details

Overview

M95128-RDW6TP from STMicroelectronics is a 128-Kbit serial SPI bus EEPROM organized as 16,384 × 8 bits, operating from 1.8 V to 5.5 V supply voltage with 20 MHz clock support. It features 64-byte page write capability, quarter/half/whole-array write protection, and an additional lockable 64-byte Identification page for secure parameter storage. Used in industrial control modules for firmware revision tracking and calibration data retention.

For engineers reviewing the M95128-RDW6TP datasheet, M95128-RDW6TP pinout, M95128-RDW6TP application, or M95128-RDW6TP equivalent, key selection considerations include its 1.8 V minimum V_CC, ECOPACK2®-compliant TSSOP8 package, 4 million write cycles, 200-year data retention, and hardware/software write protection architecture.

Technical Context

The device implements a standard SPI interface supporting CPOL=0/CPHA=0 and CPOL=1/CPHA=1 modes, with data latched on C's rising edge and output shifted on its falling edge. Internal high-voltage generation enables byte/page writes within 5 ms without external charge pumps.

It integrates a non-volatile status register with BP1/BP0 bits for software-configurable block protection and SRWD+W pin for hardware-enforced Status register lockdown. The HOLD pin allows pause/resume of ongoing SPI transfers without chip deselection or state loss.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	128 Kbit (16 Kbytes), organized as 16,384 × 8 bits - directly addressable via two-byte SPI address field
Supply voltage	1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters
Max clock frequency	20 MHz - supports ≤50 ns t_CH/t_CL, enabling fast configuration reads in real-time systems
Write endurance	4 million cycles - sufficient for daily firmware update logging over 10+ years in field-deployed equipment
Data retention	200 years at 25 °C - ensures calibration constants remain valid across product lifecycle without refresh
Operating temperature	−40 °C to +85 °C - qualified for industrial ambient environments including motor drives and PLC I/O modules
Page size	64 bytes - aligns with common MCU DMA buffer sizes and minimizes partial-page write overhead

Pinout & Package

Supplied in ECOPACK2®-compliant TSSOP8 (169 mil width) package with gull-wing leads, compatible with standard reflow profiles and automated optical inspection.

Pin/Terminal	Circuit Role	Design Meaning
S	Chip select	Active-low enable; falling edge required after power-up before first instruction - prevents spurious writes during rail ramp-up
C	Serial clock	Input timing reference; rising edge latches D, falling edge outputs Q - defines deterministic SPI timing boundaries
D	Serial data input	MSB-first instruction/address/data input; sampled only when S is low and C rising - enforces strict protocol compliance
Q	Serial data output	MSB-first read data output; driven only when S is low and C falling - avoids bus contention in multi-device SPI daisy chains
W	Write protect	Hardware lock for BP1/BP0/SRWD bits; low + SRWD=1 enables Hardware Protected mode - blocks accidental Status register corruption
HOLD	Communication hold	Pauses active SPI transfer without resetting internal state; requires S low and C low to assert - preserves partial command context
V_CC	Supply voltage	1.8–5.5 V power rail; decoupling capacitor (10–100 nF) required near pins to suppress switching noise during write cycles
V_SS	Ground	Reference for all I/O and internal logic; must be low-impedance return path to prevent V_CC droop during HV generation

Key Features

Feature	Design Value
Identification page	64-byte dedicated memory area with permanent lock (LID instruction) - stores immutable device-specific keys or calibration IDs
Multi-level write protection	Software (BP1/BP0 bits) + hardware (W pin + SRWD) dual-layer control - prevents unauthorized writes even if firmware is compromised
Hold function	Real-time SPI transaction suspension without chip deselect - essential for time-critical systems sharing SPI bus with ADCs or sensors
ECOPACK2® packaging	TSSOP8 with halogen-free, RoHS-compliant materials and enhanced thermal performance - meets industrial sustainability and reliability requirements
Power-on reset (POR)	Internal POR circuit holds device inactive until V_CC exceeds threshold - eliminates need for external reset IC in space-constrained designs

Applications

Industrial PLC I/O Modules

Medical Device Calibration Storage

Use Scenario: Storing channel-specific gain/offset coefficients and sensor linearization tables in modular analog input cards.

IC Role / Device Role / Timing Role: Non-volatile configuration memory accessed during power-up and runtime recalibration sequences.

Use Value: Enables field-upgradable calibration without firmware reflashing; 200-year retention guarantees accuracy across device lifetime.

Use Scenario: Securing FDA-mandated device serial numbers, manufacturing dates, and calibration timestamps in portable diagnostic tools.

IC Role / Device Role / Timing Role: Tamper-resistant identity and audit log storage with hardware-locked Identification page.

Use Value: LID instruction permanently disables writes to ID page, satisfying regulatory traceability requirements for Class II devices.

Automotive Body Control Units

Smart Energy Meter Firmware Logs

Use Scenario: Recording door actuator cycle counts, window position limits, and seat memory presets in BCM modules.

IC Role / Device Role / Timing Role: High-endurance parameter storage interfaced via SPI to 32-bit automotive MCUs (e.g., SPC5).

Use Value: 4 million write cycles support >10 years of daily usage; −40 °C to +85 °C rating matches under-hood thermal profile.

Use Scenario: Logging firmware version rollbacks, meter tamper events, and time-of-use tariff changes in ANSI C12.22-compliant meters.

IC Role / Device Role / Timing Role: Secure event journal with write-protection granularity down to quarter-memory blocks.

Use Value: BP1/BP0 bits allow locking tariff tables while permitting firmware update logs - enforces data integrity hierarchy.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT25128B-SSHL-T	1.8–5.5 V operation, 20 MHz max, but lacks Identification page and hardware SRWD+W lock	No permanent ID lock capability; relies solely on software BP bits for protection	Select when cost sensitivity outweighs need for hardware-enforced ID immutability
BR24G128FJ-WE2	I²C interface (not SPI), 1.7–5.5 V, 1 MHz max clock, 1 million write cycles	Requires I²C-capable host; unsuitable for high-speed SPI-bus systems with tight timing budgets	Choose only for legacy I²C designs where bus topology prohibits SPI adoption

Compared with AT25128B-SSHL-T and BR24G128FJ-WE2, M95128-RDW6TP uniquely combines SPI speed, hardware-locked ID page, and 4M-cycle endurance - making it optimal for safety-critical industrial firmware storage where both speed and security are mandatory.

Availability

M95128-RDW6TP is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical calibration systems, automotive body control units, and smart energy meter firmware logging requiring stable component supply and long-term obsolescence management.

Supply support for M95128-RDW6TP 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, specializing in microcontrollers, power management, and non-volatile memory solutions for industrial, automotive, and consumer markets.

M95128-RDW6TP belongs to ST's M95 serial EEPROM product line, engineered for robustness in harsh environments with emphasis on data integrity, long-term reliability, and seamless integration into resource-constrained embedded systems.

FAQ

What is the function of the HOLD pin during active SPI communication?

The HOLD pin pauses ongoing SPI transfers without deselecting the device or resetting internal state. It requires Chip Select (S) to be low and Serial Clock (C) to be low when asserted. During HOLD, Q goes high-impedance and D/C are ignored, allowing the host to service higher-priority interrupts while preserving command context for resumption.

How does the Identification page differ from standard memory array pages?

The Identification page is a dedicated 64-byte region accessible only via RDID/WRID instructions (not standard READ/WRITE). Once locked using the LID instruction, it becomes permanently read-only - preventing overwrite of critical device identifiers like serial numbers or calibration keys, even if the Status register is reconfigured.

Can the M95128-RDW6TP operate reliably at 1.8 V while sustaining 20 MHz clock speed?

Yes - the M95128-R variant (including -RDW6TP) is fully specified for 1.8 V to 5.5 V operation with 20 MHz maximum clock across the full −40 °C to +85 °C temperature range. DC and AC parameters in DS1356 Rev 20 confirm t_CH/t_CL ≥50 ns and setup/hold times meet timing at 1.8 V.

What happens if the Write Protect (W) pin is left floating during operation?

Leaving W floating violates the absolute maximum ratings and may cause unpredictable behavior: SRWD bit writes could fail, Block Protect bits might become unchangeable, or the device may enter undefined protection states. STMicroelectronics specifies W must be actively driven high or low - a 10 kΩ pull-up to V_CC is recommended for default unprotected operation.

M95128-RDW6TP 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:: 128Kbit

Memory Organization:: 16K x 8

Memory Interface:: SPI

Clock Frequency:: 20 MHz

Write Cycle Time - Word, Page:: 5ms

Access Time:: -

Voltage - Supply:: 1.8V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

M95128-RDW6TP FAQ

1.How can I place an order for M95128-RDW6TP through Aetrix?

Please submit a Request for Quotation (RFQ) for M95128-RDW6TP 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 M95128-RDW6TP reliable?

The price and inventory of M95128-RDW6TP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M95128-RDW6TP is usually 5 days.

3.What payment methods are accepted for M95128-RDW6TP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M95128-RDW6TP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M95128-RDW6TP?

M95128-RDW6TP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M95128-RDW6TP 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 M95128-RDW6TP?

For technical support, including M95128-RDW6TP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M95128-RDW6TP requirements.

6.How does Aetrix verify that M95128-RDW6TP is sourced from the original manufacturer or authorized distributors?

All M95128-RDW6TP 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 M95128-RDW6TP meets industry standards.

7.What is the process for return or replacement of M95128-RDW6TP?

All M95128-RDW6TP units undergo pre-shipment inspection (PSI). If there is an issue with M95128-RDW6TP, 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 M95128-RDW6TP part is unused and in its original packaging.

Return procedure for M95128-RDW6TP:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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