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

Infineon Technologies FM25640B-GTR

Name: FM25640B-GTR
Brand: Infineon Technologies
SKU: FM25640B-GTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FM25640B-GTR

Manufacturer:: Infineon Technologies

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: FM25640B-GTR.pdf

Description:: IC FRAM 64KBIT SPI 20MHZ 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:3,113

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Product details

Overview

FM25640B-GTR from Infineon Technologies (formerly Cypress) is a 64-Kbit serial SPI F-RAM organized as 8K × 8, delivering NoDelay™ writes, 10¹⁴ read/write endurance, and 151-year data retention at industrial temperature (–40 °C to +85 °C). It operates at up to 20 MHz SPI clock, supports modes 0 and 3, and replaces serial EEPROM/flash in real-time data logging systems.

For engineers reviewing the FM25640B-GTR datasheet, FM25640B-GTR pinout, FM25640B-GTR application, or FM25640B-GTR equivalent, key selection criteria include write-cycle speed without polling, hardware/software write protection granularity, SOIC-8 package compatibility, and VDD = 4.5–5.5 V operation in embedded control and metering environments.

Technical Context

The FM25640B-GTR implements ferroelectric memory cell architecture enabling true byte-write capability at bus speed-no internal write cycle delay or status polling required. Its SPI interface handles opcodes (e.g., WREN, READ, WRITE) with 13-bit addressing (upper 3 bits ignored), and integrates a nonvolatile status register for block protection configuration.

Write protection is enforced via dual-layer control: hardware-level WP pin assertion (when WPEN=1) blocks status register writes, while software-configurable block protection (1/4, 1/2, or full array) uses the status register's BP0/BP1 bits. The device lacks internal power management beyond POR, requiring strict VDD regulation during active CS.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	64 Kbit (8K × 8); enables direct byte-addressable storage without page management overhead
Endurance	10¹⁴ read/write cycles; supports >27,000 writes/sec continuously for 10+ years in data-logging nodes
Data retention	151 years at +85 °C; eliminates periodic refresh or backup power requirements in sealed industrial sensors
SPI speed	Up to 20 MHz; achieves 2.5 MB/s peak throughput-5× faster than typical 4-MHz EEPROM writes
Supply voltage	VDD = 4.5 V to 5.5 V; compatible with legacy 5 V microcontroller I/O without level shifting
Operating temp	–40 °C to +85 °C; qualified for use in motor drives, smart meters, and factory automation controllers
Active current	250 µA at 1 MHz; reduces average power in battery-backed event recorders
Standby current	4 µA (typ); enables multi-year operation on coin-cell batteries in maintenance-free IoT endpoints

Pinout & Package

FM25640B-GTR is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package with standard 150-mil body width and gull-wing leads. Pin spacing is 1.27 mm, compliant with IPC-7351B footprint MS-012AA.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select input	Active-low enable: must fall before each opcode; places device in standby (high-Z SO, 4 µA IDD) when high
SCK	Serial clock input	Synchronizes all I/O; rising edge latches SI, falling edge drives SO; supports 0–20 MHz with arbitrary pauses
SI	Serial input	Receives opcodes, addresses, and write data; must be driven to valid logic level even during idle to meet IDD spec
SO	Serial output	Drives read data on falling SCK edge; tristated when CS high or HOLD low; not shared with SI by default
WP	Write protect input	Hardware lock: when WPEN=1 in status register, LOW on WP blocks status register writes only-not memory writes
HOLD	Operation suspend input	Pauses ongoing read/write mid-transfer; requires SCK=LOW during transition; resumes automatically on HIGH
VSS	Ground	Reference return path for all signals and power; must connect to system ground plane with low-inductance trace
VDD	Power supply	4.5–5.5 V supply; powers core logic and F-RAM array; decoupling capacitor (0.1 µF) required within 5 mm

Key Features

Feature	Design Value
NoDelay™ write execution	Byte writes complete within one SPI frame-no internal timing delay or polling loop needed, eliminating firmware latency in time-critical logging
Ferroelectric memory cell	Enables 10¹⁴ endurance and 151-year retention without wear leveling or ECC, reducing host MCU processing load
Dual-mode SPI interface	Supports both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), ensuring interoperability with diverse microcontroller SPI peripherals
Configurable block protection	Software-selectable 1/4, 1/2, or full-array write lock via status register BP0/BP1 bits-enables secure parameter storage in field-upgradable devices
Hardware/software write protection	WP pin guards status register writes when enabled; SI-driven WREN/WRDI instructions control memory write latch-provides layered security against accidental overwrites

Applications

Smart Energy Metering

Industrial PLC Data Logging

Use Scenario: Storing tariff rates, consumption timestamps, and tamper events in ANSI C12.19-compliant electricity meters.

IC Role / Device Role / Timing Role: Nonvolatile scratchpad memory interfacing directly with 8-bit/16-bit metering SoCs via SPI.

Use Value: 10¹⁴ endurance ensures >30 years of hourly billing data writes without degradation; 20 MHz SPI enables sub-millisecond log commits during power failover.

Use Scenario: Capturing sensor readings, fault codes, and operational states in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: High-reliability data buffer between real-time I/O modules and ARM-based controller CPUs.

Use Value: NoDelay™ writes prevent data loss during 10 ms scan cycles; 151-year retention guarantees integrity across product lifecycle without battery backup.

Medical Diagnostic Equipment

Automotive Telematics Control Units

Use Scenario: Recording calibration coefficients, usage logs, and diagnostic snapshots in portable ultrasound and ECG devices.

IC Role / Device Role / Timing Role: Secure configuration store accessed during boot and runtime by Cortex-M4 application processors.

Use Value: Hardware WP pin prevents corruption of FDA-required calibration data during firmware updates; SOIC-8 footprint simplifies layout in space-constrained handheld enclosures.

Use Scenario: Storing GPS trajectory buffers, crash event pre-triggers, and OTA update metadata in automotive-grade TCUs.

IC Role / Device Role / Timing Role: SPI-connected nonvolatile memory operating across –40 °C to +85 °C ambient in engine bay proximity.

Use Value: Industrial temp rating and 4.5–5.5 V operation ensure reliability under alternator ripple; block protection isolates critical firmware parameters from user-accessible data partitions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MB85RS64V	64 Kbit FRAM, 1.8–3.6 V supply, 15 MHz max SPI, SOIC-8 but no HOLD pin	Requires level-shifting for 5 V systems; lacks HOLD for interrupt-safe logging; lower voltage range suits portable designs	Select when operating from 3.3 V rails and HOLD functionality is unnecessary
AT25DF041A	4 Mbit serial flash, 2.7–3.6 V, 80 MHz DTR SPI, requires 25 ms page programming, 100k endurance	Higher density but slower writes, limited endurance, and voltage incompatibility with 5 V hosts	Choose only if cost-per-bit is primary and write frequency is low (<100 writes/day)

Compared with MB85RS64V and AT25DF041A, FM25640B-GTR uniquely delivers 5 V compatibility, HOLD pin support for deterministic interrupt handling, and 10⁹× higher endurance-making it optimal for high-write industrial and metering applications where 5 V infrastructure persists.

Availability

FM25640B-GTR is available at Aetrix Electronics and suitable for smart metering, industrial PLC data buffering, and medical device calibration storage requiring stable component supply across extended product lifecycles.

Supply support for FM25640B-GTR 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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, sensing, and connectivity solutions for industrial, automotive, and IoT markets.

The FM25640B-GTR belongs to Infineon's F-RAM portfolio-designed specifically for applications demanding unlimited write endurance, instant write commit, and long-term data integrity without battery backup or complex firmware overhead.

FAQ

Is FM25640B-GTR pin-compatible with standard SPI EEPROMs like AT25040?

Yes-FM25640B-GTR uses identical SOIC-8 pinout and SPI command set (WREN, WRITE, READ, RDSR) as AT25040, enabling drop-in replacement. However, it adds HOLD and WP pins not present on AT25040, which remain NC or tied to VDD in legacy designs. No PCB change is needed for basic read/write migration.

Does FM25640B-GTR require external high-voltage programming pulses?

No-FM25640B-GTR performs all writes using standard VDD (4.5–5.5 V) with no charge pumps or high-voltage generators. Unlike EEPROM or flash, it writes data immediately upon receiving each byte over SPI, eliminating the need for erase-before-write sequences or elevated programming voltages.

How does the HOLD pin behave during an active write operation?

When HOLD is pulled LOW during a write, the FM25640B-GTR suspends the current transaction after completing the current byte transfer. SCK and CS are ignored until HOLD returns HIGH, then the device resumes from the next address without data corruption. This enables deterministic interruption for higher-priority CPU tasks in real-time systems.

Can FM25640B-GTR be used in 3.3 V systems?

No-FM25640B-GTR is specified only for 4.5–5.5 V operation. Attempting 3.3 V supply violates absolute maximum ratings and causes undefined behavior, including failed writes and status register corruption. For 3.3 V designs, consider Infineon's MB85RS64V or Cypress' FM25V05 as functionally similar alternatives.

FM25640B-GTR Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: F-RAM™

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:: FRAM

Technology:: FRAM (Ferroelectric RAM)

Memory Size:: 64Kbit

Memory Organization:: 8K x 8

Memory Interface:: SPI

Clock Frequency:: 20 MHz

Write Cycle Time - Word, Page:: -

Access Time:: -

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

FM25640B-GTR FAQ

1.How can I place an order for FM25640B-GTR through Aetrix?

Please submit a Request for Quotation (RFQ) for FM25640B-GTR 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 FM25640B-GTR reliable?

The price and inventory of FM25640B-GTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FM25640B-GTR is usually 5 days.

3.What payment methods are accepted for FM25640B-GTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FM25640B-GTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FM25640B-GTR?

FM25640B-GTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FM25640B-GTR 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 FM25640B-GTR?

For technical support, including FM25640B-GTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FM25640B-GTR requirements.

6.How does Aetrix verify that FM25640B-GTR is sourced from the original manufacturer or authorized distributors?

All FM25640B-GTR 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 FM25640B-GTR meets industry standards.

7.What is the process for return or replacement of FM25640B-GTR?

All FM25640B-GTR units undergo pre-shipment inspection (PSI). If there is an issue with FM25640B-GTR, 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 FM25640B-GTR part is unused and in its original packaging.

Return procedure for FM25640B-GTR:

1.Submit a request within 90 days.

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

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