[PREFIX][DENSITY][PACKAGE]
   |       |        |
   |       |        +-- Package code (A, B, C, D)
   |       +-- Memory density (32, 64, 128, 256, 512)
   +-- Series prefix (XM25QH, XM25QU, XM25LU)

XM25QH64A
|  |  |||
|  |  ||+-- A = SOIC-8 package
|  |  |+-- 64 = 64 Mbit density
|  |  +-- H = Standard 3.3V series
|  +-- 25Q = SPI Flash family
+-- XM = XMC prefix

XM25QU128B
|  |  | ||
|  |  | |+-- B = SOIC-16 package
|  |  | +-- 128 = 128 Mbit density
|  |  +-- U = 1.8V Low Voltage series
|  +-- 25Q = SPI Flash family
+-- XM = XMC prefix

XM25LU256C
|  |  | ||
|  |  | |+-- C = WSON-8 package
|  |  | +-- 256 = 256 Mbit density
|  |  +-- LU = Ultra Low Voltage series
|  +-- 25 = SPI Flash family
+-- XM = XMC prefix

// XM25QH series - Standard 3.3V
Pattern XM25QH_PATTERN = Pattern.compile("^XM25QH\\d+[A-Z]*.*", Pattern.CASE_INSENSITIVE);

// XM25QU series - 1.8V Low Voltage
Pattern XM25QU_PATTERN = Pattern.compile("^XM25QU\\d+[A-Z]*.*", Pattern.CASE_INSENSITIVE);

// XM25LU series - Ultra Low Voltage
Pattern XM25LU_PATTERN = Pattern.compile("^XM25LU\\d+[A-Z]*.*", Pattern.CASE_INSENSITIVE);

// XMC format: XM25QHxxxY where Y is the package code
// Extract the letter after density digits
Matcher matcher = DENSITY_PATTERN.matcher(upperMpn);
if (matcher.find()) {
    int densityEnd = matcher.end();
    if (densityEnd < upperMpn.length()) {
        String pkgCode = upperMpn.substring(densityEnd, densityEnd + 1);
        // Map to package: A=SOIC-8, B=SOIC-16, C=WSON-8, D=USON-8
    }
}

// Determine operating voltage based on series
switch (series) {
    case "XM25QH" -> "2.7V-3.6V";
    case "XM25QU" -> "1.65V-2.0V";
    case "XM25LU" -> "1.65V-1.95V";
}