Infineon Technologies CY15B108QN-50BKXI

Overview

CY15B108QN-50BKXI from Infineon is an 8-Mbit serial ferroelectric RAM (F-RAM) organized as 1024K × 8, operating at up to 50 MHz SPI clock, with 1.8 V to 3.6 V supply, industrial temperature range (–40°C to +85°C), and 24-ball FBGA package. It delivers instant non-volatile writes, 10¹⁵ read/write endurance, and 151-year data retention for high-cycle logging in industrial controllers.

For engineers reviewing the CY15B108QN-50BKXI datasheet, CY15B108QN-50BKXI pinout, CY15B108QN-50BKXI application, or CY15B108QN-50BKXI equivalent, key selection criteria include SPI mode 0/3 compatibility, hardware/software write protection (WP pin + WRDI instruction), 256-byte dedicated special sector surviving three reflow cycles, and ultra-low deep power-down current (0.1 µA).

Technical Context

The CY15B108QN implements a true SPI slave interface with zero-write-latency architecture: data commits immediately upon byte transfer without polling, enabling deterministic timing in real-time systems. Its ferroelectric memory array eliminates erase-before-write overhead and supports full 50 MHz bus-speed writes across all address ranges.

It integrates a non-volatile status register with WPEN bit control, hardware write protect (WP pin), software block protection (1/4, 1/2, or full array), and dual identification resources - read-only Device ID (manufacturer + product ID) and writable 8-byte serial number registers - all accessible via standardized SPI opcodes.

Key Specifications

Pinout & Package

Package: 24-ball fine-pitch ball grid array (FBGA), 6 mm × 8 mm footprint, 0.8 mm ball pitch, RoHS-compliant, suitable for automated SMT assembly and thermal cycling reliability in harsh environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY15B108QN-50ZSXI and FM25V05-G, the CY15B108QN-50BKXI uniquely combines 8 Mbit density, 50 MHz speed, FBGA miniaturization, and 0.1 µA hibernate current - making it the sole option for space-constrained, high-throughput, battery-powered industrial recorders.

Availability

CY15B108QN-50BKXI is available at Aetrix Electronics and suitable for industrial data loggers, smart metering systems, PLC I/O modules, and medical diagnostic recorders requiring stable component supply across extended product lifecycles.

Supply support for CY15B108QN-50BKXI 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, and high-reliability memory solutions, with global manufacturing and quality certification to ISO/TS 16949 and IATF 16949.

The EXCELON™ LP F-RAM product line targets mission-critical non-volatile data capture in industrial automation, energy infrastructure, and medical devices - prioritizing write endurance, zero-latency persistence, and extended temperature reliability over cost-per-bit.

FAQ

Is CY15B108QN-50BKXI pin-compatible with standard SPI serial flash or EEPROM devices?

No - while it uses the same 4-wire SPI interface (CS, SCK, SI, SO) and shares functional pin roles, its 24-ball FBGA package differs physically from common 8-pin SOIC or WSON flash packages. Board layout requires dedicated footprint; however, firmware migration from SPI flash is straightforward due to identical command set structure and absence of erase commands.

Does the 256-byte special sector retain data during PCB rework or reballing?

Yes - the dedicated special sector is qualified to survive up to three standard JEDEC J-STD-020D reflow cycles (peak 260°C, 20–40 sec above 220°C). This enables reliable pre-programming of board IDs or calibration data before final assembly, with verified retention post-reflow per Infineon characterization data.

How does write protection behave when both WP pin and Status Register WPEN bit are active?

When WPEN = 1 in the Status Register, the WP pin becomes active-low hardware protection for Status Register writes only - it does not block memory array writes. Memory array protection is controlled separately by software block protection bits (BP0/BP1) and Write Disable (WRDI) instruction. This layered scheme allows independent lockdown of configuration vs. data regions.

Can CY15B108QN-50BKXI operate reliably at 1.8 V while sustaining 50 MHz SPI communication?

Yes - the datasheet specifies full 50 MHz operation down to VDD = 1.8 V, with timing parameters (tSU, tH, tV) validated across the entire 1.8–3.6 V range. At 1.8 V, active current is 2.5 mA (typ), meeting industrial low-power requirements without frequency derating.