Infineon Technologies CY15B108QN-50BKXQT

Overview

CY15B108QN-50BKXQT from Infineon is an 8-Mbit serial ferroelectric RAM (F-RAM) organized as 1024K × 8, operating at up to 50 MHz SPI clock speed with 1.8 V–3.6 V supply, -40°C to +105°C extended industrial temperature range, and 100 trillion (10¹⁴) read/write endurance - deployed in real-time data logging systems where rapid non-volatile writes prevent loss during power interruption.

For engineers reviewing the CY15B108QN-50BKXQT datasheet, CY15B108QN-50BKXQT pinout, CY15B108QN-50BKXQT application, or CY15B108QN-50BKXQT equivalent, key selection criteria include instant write capability (no polling), deep power-down current (1.10 µA), hardware/software write protection, dedicated 256-byte reflow-survivable sector, and SPI Mode 0/3 compatibility with microcontroller host interfaces.

Technical Context

The CY15B108QN-50BKXQT implements a true serial F-RAM architecture with zero write latency: data commits immediately upon byte transfer completion, eliminating timeout polling and enabling deterministic bus timing. Its internal control logic decodes standard SPI opcodes (e.g., Read, Write, WREN, WRDI) and manages status register-based protection without external timing components.

It integrates dual-layer write protection - hardware via active-low WP pin (when WPEN=1) and software via Status Register bits - plus configurable block protection for 1/4, 1/2, or full array. The device also embeds manufacturer ID, product ID, unique device ID, and user-writable 8-byte serial number registers accessible over SPI.

Key Specifications

Pinout & Package

Package: 24-ball fine-pitch ball grid array (24-ball FBGA), 4.0 mm × 3.0 mm × 0.7 mm body, 0.5 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial non-volatile memory applications.

Compared with CY15B108QSN-50ZSXI, the CY15B108QN-50BKXQT offers superior board-level miniaturization and thermal performance in high-density layouts; versus AT45DB081E-SHN-T, it delivers 1 billion× higher endurance and eliminates erase latency - critical for deterministic real-time systems.

Availability

CY15B108QN-50BKXQT is available at Aetrix Electronics and suitable for industrial data loggers, automotive telematics units, smart utility meters, and medical infusion pumps requiring stable component supply across multi-year production cycles.

Supply support for CY15B108QN-50BKXQT 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, automotive ICs, security controllers, and non-volatile memory solutions.

The EXCELON™ LP F-RAM product line targets high-reliability, low-power, high-endurance applications where traditional flash or EEPROM fails - especially in mission-critical data acquisition, industrial control, and automotive black-box recording.

FAQ

Is CY15B108QN-50BKXQT pin-compatible with standard SPI flash devices?

Yes - it uses industry-standard SPI pinout (CS, SCK, SI, SO, WP, VDD, VSS) and supports SPI Modes 0 and 3. No hardware redesign is needed when replacing 8-Mbit SPI flash or EEPROM, though firmware must remove polling loops due to instant write behavior.

What is the purpose of the DNU pin, and how should it be handled on the PCB?

The DNU (Do Not Use) pin is internally unconnected and serves no electrical function. Per Infineon's design guidance, it may be left floating or tied to VDD - neither choice affects operation, but tying to VDD simplifies layout and avoids potential ESD concerns in high-noise environments.

How does the 256-byte special sector differ from main memory in terms of reflow survivability?

This sector is fabricated with enhanced ferroelectric layer stability and undergoes additional process qualification. It retains data through three full JEDEC J-STD-020D reflow cycles (peak 260°C, 60 sec), whereas main array data may degrade after repeated thermal exposure - enabling permanent board ID or calibration storage set during manufacturing.

Can the unique device ID be read without issuing a write-enable command?

Yes - the 64-bit unique device ID is stored in a read-only register and accessible via the RDID instruction (0x9F) without any prior WREN command. This allows secure device authentication and inventory tracking at boot time, independent of write protection state.