Infineon Technologies CY15B104QN-20LPXCT

Overview

CY15B104QN-20LPXCT from Infineon is a 4-Mb serial ferroelectric RAM (F-RAM) organized as 512K × 8, operating over SPI at up to 50 MHz with 1.8 V–3.6 V supply, 10¹⁵ write endurance, and 151-year data retention. It serves as nonvolatile memory in real-time data logging systems where rapid, reliable byte-level writes eliminate flash/EEPROM latency and wear-out.

For engineers reviewing the CY15B104QN-20LPXCT datasheet, CY15B104QN-20LPXCT pinout, CY15B104QN-20LPXCT application, or CY15B104QN-20LPXCT equivalent, key selection criteria include SPI mode 0/3 compatibility, hardware/software write protection, deep power-down current (0.70 µA), and industrial temperature range (–40°C to +85°C).

Technical Context

The CY15B104QN-20LPXCT implements an SPI slave interface with zero-write-latency architecture: data commits immediately upon byte transfer without polling, enabling deterministic timing in time-critical control loops. Its ferroelectric memory array eliminates erase cycles and supports true random-access reads/writes at bus speed.

It integrates a nonvolatile status register with WPEN bit, dedicated 256-byte special sector surviving three reflow cycles, Device ID (manufacturer + product ID), and writable 8-byte serial number - all accessible via standardized SPI opcodes including WREN, WRDI, RDSR, and RDID.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), RoHS-compliant, surface-mount, standard footprint compatible with automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY15B104QSN-20LPXC and FM25V04-G, the CY15B104QN-20LPXCT uniquely delivers industrial SOIC reliability, dedicated reflow-tolerant sector, and full serialization-making it optimal for field-upgradable, safety-critical, and long-lifecycle deployments.

Availability

CY15B104QN-20LPXCT is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, and PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for CY15B104QN-20LPXCT 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 German semiconductor leader specializing in power management, sensing, and nonvolatile memory solutions for industrial, automotive, and IoT applications.

The EXCELON™ LP F-RAM product line targets high-reliability, low-power embedded systems demanding instant-write nonvolatility-replacing legacy EEPROM and flash where endurance, speed, and predictability are critical.

FAQ

Is CY15B104QN-20LPXCT pin-compatible with standard SPI EEPROMs like AT25DF041?

No. While both use 8-pin SOIC and SPI communication, CY15B104QN-20LPXCT has a DNU pin and different pin assignments (e.g., WP function on pin 3 vs. HOLD on many EEPROMs). Its command set, status register layout, and absence of erase cycles require firmware adaptation-not drop-in replacement.

Does the 256-byte special sector support read-modify-write operations?

Yes. The special sector is fully readable and writable via standard SPI memory opcodes (READ, WRITE), with identical timing and protection mechanisms as main array. Its content survives reflow because ferroelectric cells retain polarization through soldering thermal profiles.

What happens if the WP pin is left floating during operation?

Leaving WP floating violates the datasheet requirement. It may float LOW unpredictably, unintentionally locking status register writes and preventing configuration changes. Infineon specifies WP must be tied to VDD if unused to ensure reliable operation and avoid intermittent write-protection faults.

Can CY15B104QN-20LPXCT operate at 50 MHz with 3.3 V VDD and industrial temperature?

Yes. The datasheet confirms 50 MHz maximum SPI clock applies across the full industrial temperature range (–40°C to +85°C) and entire VDD range (1.8 V–3.6 V). No derating is required; AC timing parameters are specified at worst-case conditions including 3.3 V and +85°C.