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

Cypress Semiconductor Corp FM25640B-G2TR

Name: FM25640B-G2TR
Brand: Cypress Semiconductor Corp
SKU: FM25640B-G2TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: FM25640B-G2TR

Manufacturer:: Cypress Semiconductor Corp

Category:: Memory

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

Datasheet:: FM25640B-G2TR.pdf

Description:: FRAM (FERROELECTRIC RAM) MEMORY

Quantity:: RFQ Add To RFQ list

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Inventory:2,500

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Product details

Overview

FM25640B-G2TR from Infineon Technologies (formerly Cypress) is a 64-Kbit (8K × 8) serial SPI F-RAM nonvolatile memory with NoDelay™ writes, 10¹⁴ read/write endurance, and 151-year data retention. It operates at up to 20 MHz SPI clock, supports SPI modes 0 and 3, and uses an 8-pin SOIC package for industrial applications requiring rapid, reliable data logging in energy metering and PLC I/O modules.

For engineers reviewing the FM25640B-G2TR datasheet, FM25640B-G2TR pinout, FM25640B-G2TR application, or FM25640B-G2TR equivalent, key selection criteria include write latency independence from bus speed, hardware/software write protection granularity (1/4, 1/2, full array), VDD = 4.5–5.5 V operation, and –40 °C to +85 °C industrial temperature compliance.

Technical Context

The FM25640B-G2TR implements ferroelectric memory cells enabling true RAM-like random-access reads/writes without erase cycles or write delays. Its internal architecture includes a dedicated instruction decoder, address counter, and nonvolatile status register managing WPEN, BP1/BP0 bits for block protection.

It functions as a synchronous SPI slave device with rising-edge input sampling and falling-edge output driving on SCK, supporting direct hardware replacement of serial EEPROM and flash in legacy designs while eliminating polling overhead and endurance limitations.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	64 Kbit (8K × 8) - provides 8,192 addressable bytes for compact firmware parameter storage or real-time sensor log buffers.
SPI Speed	Up to 20 MHz - enables sub-1 μs per-byte write transfer time, critical for burst-mode data capture without CPU blocking.
Endurance	10¹⁴ read/write cycles - supports >27,000 writes/second continuously for 10+ years, eliminating wear leveling firmware overhead.
Data Retention	151 years at +85 °C - ensures unpowered data integrity across product lifecycles in industrial control cabinets.
Supply Voltage	VDD = 4.5 V to 5.5 V - matches standard 5 V logic rails and avoids level-shifting in legacy microcontroller interfaces.
Operating Temp	–40 °C to +85 °C - qualified for deployment in outdoor utility meters and factory-floor automation equipment.
Active Current	250 μA at 1 MHz - reduces average power in battery-backed data loggers during frequent small-write operations.

Pinout & Package

FM25640B-G2TR is housed in an 8-pin Small Outline Integrated Circuit (SOIC) package with standard 1.27 mm pitch, compatible with automated PCB assembly and 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 (4 μA) when high, isolating SO/SI from bus contention.
SCK	Serial Clock Input	Synchronizes all transfers; inputs latched on rising edge, outputs driven on falling edge; supports 0–20 MHz with no minimum duty cycle requirement.
SI	Serial Input	Receives opcodes, addresses, and write data; sampled on SCK rising edge; must be held valid during active CS to meet IDD specs.
SO	Serial Output	Drives read data and status register contents on falling SCK edge; tristated when CS high or HOLD low.
WP	Write Protect Input	Hardware lock: when WPEN=1 in status register and WP low, prevents status register writes only-not memory array writes.
HOLD	Operation Suspend Input	Pauses ongoing read/write mid-transfer when pulled low while SCK is low; resumes automatically when released, preserving internal state.
VSS	Ground	Reference return path for all digital and analog circuitry; requires low-impedance connection to system ground plane.
VDD	Power Supply	5 V nominal supply; internal POR circuit ensures safe initialization; must remain within 4.5–5.5 V during all operations.

Key Features

Feature	Design Value
NoDelay™ Write Architecture	Zero-latency byte writes: data committed immediately after SI shift-in completes-no polling, no timeout, no firmware wait loops required.
10¹⁴ Endurance	Enables continuous logging at 100 Hz for >31 years without degradation-replaces EEPROM in smart grid endpoint nodes where field replacement is prohibitive.
Configurable Block Protection	Software-selectable 1/4, 1/2, or full-array write lock via status register BP1/BP0 bits-secures calibration tables while allowing runtime parameter updates.
SPI Mode 0 & 3 Compatibility	Interoperates with legacy and modern MCUs (e.g., STM32, PIC, MSP430) without protocol translation or GPIO bit-banging overhead.

Applications

Energy Metering

Industrial PLC I/O Modules

Use Scenario: Storing tariff schedules, tamper-event timestamps, and cumulative kWh registers in Class 0.5S electricity meters.

IC Role / Device Role / Timing Role: Nonvolatile parameter store with deterministic <1 μs write latency per byte, synchronized to metrology IC interrupt pulses.

Use Value: Eliminates risk of data loss during mains dropout by completing writes before next AC cycle zero-crossing.

Use Scenario: Logging sensor fault codes, configuration changes, and diagnostic snapshots in DIN-rail mounted remote I/O terminals.

IC Role / Device Role / Timing Role: High-endurance event logger interfaced directly to ARM Cortex-M4 UART-to-SPI bridge.

Use Value: Sustains 10,000+ daily configuration writes over 15-year product lifecycle without wear leveling or backup capacitors.

Medical Infusion Pumps

Automotive Body Control Modules

Use Scenario: Recording dose history, alarm logs, and calibration drift compensation values in FDA-cleared infusion systems.

IC Role / Device Role / Timing Role: Fail-safe audit trail memory with 151-year retention, powered from isolated 5 V rail during main power failure.

Use Value: Meets IEC 62304 SW safety Class C requirements for persistent data integrity without external supervision.

Use Scenario: Storing seat position presets, mirror angle offsets, and lighting configuration profiles in 12 V automotive BCMs.

IC Role / Device Role / Timing Role: SPI-configurable NV memory accessed during ignition-on initialization and runtime profile switching.

Use Value: Withstands 40 V load-dump transients and –40 °C cold-cranking without data corruption due to robust ferroelectric cell design.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT25SF041-SSHD-B	4 Mbit SPI flash; requires 50 ms sector erase before write; 100k endurance; 20-year retention at 25 °C.	Requires firmware erase management; unsuitable for sub-millisecond write bursts; higher latency invalidates real-time logging.	Select only if density >64 Kbit is mandatory and write frequency <100x/hour.
BR24G64FJ-WE2	64 Kbit I²C EEPROM; 1 MHz max clock; 1M endurance; 40-year retention at 85 °C; no hardware WP pin.	Slower interface limits throughput; lower endurance risks field failure in high-write telemetry nodes.	Prefer for space-constrained designs where I²C bus already exists and write rate is <10x/minute.

Compared with AT25SF041-SSHD-B and BR24G64FJ-WE2, FM25640B-G2TR delivers deterministic write timing, 100,000× higher endurance, and guaranteed 151-year retention at operating temperature-making it the sole choice for mission-critical, high-frequency nonvolatile storage where firmware simplicity and long-term reliability are non-negotiable.

Availability

FM25640B-G2TR is available at Aetrix Electronics and suitable for energy metering, industrial PLC I/O modules, medical infusion pumps, and automotive body control modules requiring stable component supply across multi-year production programs.

Supply support for FM25640B-G2TR 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, delivering power management, sensing, and connectivity solutions for industrial, automotive, and IoT markets.

The FM25640B-G2TR belongs to Infineon's F-RAM portfolio-designed specifically to replace serial EEPROM and flash in applications demanding infinite endurance, zero-write-latency, and guaranteed data retention without complex firmware overhead.

FAQ

Is FM25640B-G2TR pin-compatible with standard 8-pin SOIC serial EEPROMs?

Yes-FM25640B-G2TR uses identical 8-pin SOIC packaging and SPI pinout (CS, SCK, SI, SO, WP, HOLD, VSS, VDD) as industry-standard serial EEPROMs like the AT25xxx family. No PCB redesign is needed for drop-in replacement, though firmware must disable EEPROM-specific polling sequences due to NoDelay™ writes.

Does FM25640B-G2TR require external high-voltage programming circuitry?

No-FM25640B-G2TR performs all writes at standard VDD (4.5–5.5 V) with no charge pump or elevated voltage generation. Unlike EEPROM and flash, its ferroelectric memory cells switch polarization states using normal I/O voltage levels, simplifying power design and eliminating HV-related EMI concerns.

Can the HOLD pin be left unconnected in space-constrained designs?

No-HOLD must be tied to VDD if unused, per datasheet specification. Leaving it floating risks metastability during noise events, potentially causing undefined suspension of memory operations and bus lockup. A 10 kΩ pull-up to VDD satisfies this requirement with minimal board area.

What happens if WP is asserted during a WRSR command when WPEN=1?

When WPEN=1 in the status register and WP is driven LOW, the FM25640B-G2TR blocks execution of WRSR (Write Status Register) and ignores the command. Memory array writes remain enabled unless software block protection bits (BP1/BP0) are also set-ensuring critical status register configuration cannot be altered accidentally in field-deployed units.

FM25640B-G2TR Specifications

Product attributes: Attribute value

Manufacturer:: Cypress Semiconductor Corp

Series:: F-RAM™

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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-G2TR FAQ

1.How can I place an order for FM25640B-G2TR through Aetrix?

Please submit a Request for Quotation (RFQ) for FM25640B-G2TR 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-G2TR reliable?

The price and inventory of FM25640B-G2TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FM25640B-G2TR is usually 5 days.

3.What payment methods are accepted for FM25640B-G2TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FM25640B-G2TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for FM25640B-G2TR?

FM25640B-G2TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your FM25640B-G2TR 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-G2TR?

For technical support, including FM25640B-G2TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FM25640B-G2TR requirements.

6.How does Aetrix verify that FM25640B-G2TR is sourced from the original manufacturer or authorized distributors?

All FM25640B-G2TR 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-G2TR meets industry standards.

7.What is the process for return or replacement of FM25640B-G2TR?

All FM25640B-G2TR units undergo pre-shipment inspection (PSI). If there is an issue with FM25640B-G2TR, 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-G2TR part is unused and in its original packaging.

Return procedure for FM25640B-G2TR:

1.Submit a request within 90 days.

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

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