Infineon Technologies FM25L16B-G

Overview

FM25L16B-G from Infineon Technologies (formerly Cypress) is a 16-Kbit serial SPI F-RAM organized as 2K × 8, delivering true RAM-like write performance with nonvolatile data retention. It supports up to 20 MHz SPI clock, operates from 2.7 V to 3.6 V, and guarantees 10¹⁴ read/write cycles with 151-year data retention at +85 °C - ideal for high-frequency data logging in industrial controllers and metering systems.

For engineers reviewing the FM25L16B-G datasheet, FM25L16B-G pinout, FM25L16B-G application, or FM25L16B-G equivalent, key selection criteria include NoDelay™ write capability, hardware/software write protection granularity (1/4–full array), SPI mode 0/3 compatibility, and industrial temperature operation without polling or erase cycles.

Technical Context

The FM25L16B-G implements a ferroelectric memory array with zero-latency write architecture: data commits immediately upon byte transfer completion, eliminating wait states and status polling. Its internal control logic handles address decoding, opcode interpretation (WREN, READ, WRITE, RDSR, WRSR), and status register management without external timing constraints.

It integrates dedicated hardware write protection via the WP pin and software-configurable block protection through a 3-bit nonvolatile status register. The device functions as a pure SPI slave with no internal power management beyond POR, requiring strict adherence to VDD ramp and CS/SCK timing rules per Rev. *J datasheet.

Key Specifications

Pinout & Package

FM25L16B-G is available in two RoHS-compliant packages: 8-pin SOIC (3.9 mm × 4.9 mm) and 8-pin DFN (2 mm × 3 mm) with exposed pad (NC). Both share identical pin functionality and footprint-compatible layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MB85RS16 and AT25DF021, FM25L16B-G uniquely delivers simultaneous high endurance, zero-write-latency, and industrial retention - making it the sole option for systems where write cycle count, deterministic timing, and 15+ year unattended operation are co-constrained.

Availability

FM25L16B-G is available at Aetrix Electronics and suitable for industrial data loggers, smart meter firmware storage, PLC I/O module parameter retention, and medical device event recorders requiring stable component supply across multi-year production programs.

Supply support for FM25L16B-G 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, automotive ICs, and secure connectivity solutions.

The FM25L16B-G belongs to Infineon's F-RAM portfolio - engineered specifically for applications demanding ultra-high write endurance, instant nonvolatile storage, and elimination of flash/EEPROM timing complexities in real-time systems.

FAQ

Is FM25L16B-G pin-compatible with standard SPI EEPROMs like AT25010B?

Yes - FM25L16B-G uses identical 8-pin SOIC/DFN footprints and SPI command set (READ, WRITE, WREN, RDSR) as common 16-Kbit SPI EEPROMs. No PCB redesign is needed; only firmware timing adjustments (removing poll loops) are required for drop-in replacement.

Does FM25L16B-G require external high-voltage programming circuitry?

No - FM25L16B-G performs all writes at standard VDD (2.7–3.6 V) with no charge pumps or elevated voltages. Unlike EEPROM or flash, it writes data synchronously with the SPI clock without internal voltage boosting or erase-before-write sequences.

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

No - HOLD must be tied to VDD if unused. Leaving it floating risks unintended bus suspension due to noise coupling, causing communication stalls or corrupted transactions. The datasheet explicitly requires VDD termination for robust operation.

What is the maximum supported SPI clock duty cycle variation?

The FM25L16B-G accepts any SCK duty cycle between 30% and 70% across its 0–20 MHz range. Its synchronous interface samples SI on rising edges and drives SO on falling edges regardless of duty cycle asymmetry - enabling compatibility with software-bitbanged SPI implementations.