The S25FL128SDPBHIC03 is a 128 Mbit SPI NOR Flash from Infineon's FL-S series, organized as 16M x 8 bits. It uses a Quad I/O SPI interface running at up to 66 MHz, which means the read throughput can reach about 33 MB/s in quad mode — enough to shadow code to RAM or serve XIP (eXecute-In-Place) for a Cortex-M class MCU without stalling the bus. This covers most factory-floor and outdoor telecom enclosures where the ambient stays below 70°C and the die self-heating adds another 10-15°C. Packaged in a 24-ball BGA (8x6 mm body), the part is surface-mount and ships on tape and reel — the 0.80 mm ball pitch requires a controlled impedance layout on a 4-layer PCB for the SPI traces, but the small footprint saves board space compared to a 16-pin SOIC.
Active lifecycle — sourcing posture
Infineon lists the S25FL128SDPBHIC03 as Active (current production).
Board integration and compliance
The 24-BGA package has a 0.80 mm ball pitch and a 8x6 mm body. The recommended PCB land pattern is a 4x6 array with 0.40 mm pad diameter; the centre area is unpopulated, so no thermal pad is needed. Route the SPI signals (CS#, SCK, SI/SIO0, SO/SIO1, WP#/SIO2, HOLD#/SIO3) with matched trace lengths if running above 50 MHz. Operating from a single 2.7-3.6 V rail, the part draws its peak current during quad-read bursts. Place a 100 nF ceramic cap within 2 mm of each VCC ball pair to decouple the switching noise.