Infineon Technologies CY15B108QN-40LPXI

Overview

CY15B108QN-40LPXI 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 voltage, -40°C to +85°C industrial temperature range, and 24-ball FBGA package. It delivers instant non-volatile writes, 10¹⁵ read/write endurance, and 151-year data retention - ideal for high-frequency logging in industrial controllers and metering systems.

For engineers reviewing the CY15B108QN-40LPXI datasheet, CY15B108QN-40LPXI pinout, CY15B108QN-40LPXI application, or CY15B108QN-40LPXI equivalent, key selection criteria include SPI mode 0/3 compatibility, hardware/software write protection, dedicated 256-byte special sector, deep power-down current (0.1 µA), and drop-in replacement capability for serial EEPROM or flash in real-time data capture systems.

Technical Context

The CY15B108QN-40LPXI implements a true SPI slave interface with zero-write-latency architecture: data commits immediately upon byte transfer without polling, enabled by ferroelectric memory cell physics. Its internal control logic handles opcode decoding, status register management, and dual-layer write protection (WP pin + WRDI instruction + block lock bits).

It integrates a non-volatile status register, manufacturer/product ID registers, 8-byte user-writable serial number, and a dedicated 256-byte F-RAM sector qualified for three reflow cycles. The device supports full-array, half-array, and quarter-array software block protection, with WP pin overriding status register settings when asserted.

Key Specifications

Pinout & Package

Package: 24-ball fine-pitch ball grid array (FBGA), 6 mm × 8 mm, 0.8 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 CY15B108QN-40LPXI, the SOIC variant trades miniaturization and reflow robustness for assembly flexibility, while the DataFlash alternative sacrifices write speed and endurance for lower unit cost - making CY15B108QN-40LPXI the sole choice for deterministic, high-cycle, zero-latency non-volatile storage.

Availability

CY15B108QN-40LPXI is available at Aetrix Electronics and suitable for industrial data loggers, smart energy meters, and PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for CY15B108QN-40LPXI 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 memory solutions for industrial, automotive, and IoT applications.

CY15B108QN belongs to the EXCELON™ LP F-RAM product line, engineered specifically for applications demanding rapid, reliable, and low-power non-volatile data capture - replacing legacy EEPROM and flash where write latency or endurance limits system performance.

FAQ

Is CY15B108QN-40LPXI pin-compatible with standard SPI EEPROMs like AT25DF081?

No. While both use SPI interfaces, CY15B108QN-40LPXI uses a 24-ball FBGA package with specific pin assignments (e.g., DNU, NC, dedicated WP), whereas AT25DF081 uses 8-lead SOIC or WSON packages. Signal mapping differs: SO/SI are separate pins here but shared in some EEPROMs, and WP functionality is hardware-enforced only in CY15B108QN when WPEN=1.

Does the 256-byte special sector require special initialization before first use?

No initialization is required. The special sector is fully functional at power-on and behaves identically to main array F-RAM - supporting immediate reads/writes with same timing and endurance. Its reflow tolerance is inherent to the ferroelectric process and does not depend on firmware setup or OTP programming.

Can CY15B108QN-40LPXI operate reliably at 1.75 V supply?

No. The CY15B108QN variant specifies a minimum VDD of 1.8 V. Operation below 1.8 V violates absolute maximum ratings and may cause undefined behavior, including failed writes or corrupted status register reads. For 1.71–1.89 V operation, select CY15V108QN instead.

How is the Unique Device ID programmed and verified?

The 64-bit Unique Device ID is factory-laser-programmed during wafer test and permanently stored in read-only registers. It is accessible via the RDID instruction (0x9F) and cannot be altered. Verification is performed by reading bytes 4–11 of the 12-byte RDID response, which contain the unique value alongside manufacturer and product IDs.