[PREFIX][SERIES][VARIANT][PACKAGE][SUFFIX]
   |       |        |        |       |
   |       |        |        |       +-- Optional: -TR (Tape/Reel), -E (RoHS)
   |       |        |        +-- Package code (2-3 letters): GQW, GSP, GB
   |       |        +-- Optional variant or voltage code
   |       +-- 4-digit series number (e.g., 8059, 9013)
   +-- RT or RTQ (automotive grade)

RT8059GQW
||  | |||
||  | ||+-- W = Part of QFN suffix
||  | |+-- Q = QFN package indicator
||  | +-- G = Package code start
||  +-- 8059 = DC-DC converter series
|+-- RT = Richtek prefix
+-- Standard industrial grade

RT9013-33GB
||  | || ||
||  | || |+-- B = SOT-23-5 package suffix
||  | || +-- G = Package code start
||  | |+-- 33 = 3.3V voltage code
||  | +-- Hyphen separates voltage
||  +-- 9013 = LDO series
|+-- RT = Richtek prefix
+-- Standard grade

RTQ2106GQW
|||  | |||
|||  | ||+-- W = Part of QFN suffix
|||  | |+-- Q = QFN indicator
|||  | +-- G = Package start
|||  +-- 2106 = Part number
||+-- Q = Automotive grade (AEC-Q100)
|+-- RT = Richtek
+-- Automotive qualified

// Richtek package codes are typically 2-3 letters after the part number
// Pattern: RT[Q]?[0-9]{4}[package-letters]...
// Examples: RT8059GQW -> GQW -> QFN
//           RT9013-33GB -> GB -> SOT-23-5

// Handle voltage code in middle (e.g., RT9013-33GB)
// Pattern: RT[0-9]{4}-[0-9]{2}[package]
Pattern voltagePattern = Pattern.compile("^RT[0-9]{4}-[0-9]{2}([A-Z]{2,3})$");

// RTQ series returns "RTQ"
// Standard RT[4-9]xxx returns "RT4", "RT5", "RT6", "RT8", "RT9"
if (upperMpn.startsWith("RTQ")) {
    return "RTQ";
}
if (upperMpn.matches("^RT[4-9][0-9]{3}.*")) {
    return upperMpn.substring(0, 3);  // RT4, RT5, RT6, RT8, RT9
}

// LED Drivers: RT4xxx, RT84xx, RT85xx
// Voltage Regulators: RT5xxx, RT6xxx, RT8[0-367-9]xx, RT9xxx

private boolean isLEDDriver(String mpn) {
    return mpn.matches("^RT4[0-9]{3}.*") ||      // RT4xxx
           mpn.matches("^RT8[45][0-9]{2}.*") ||   // RT84xx, RT85xx
           mpn.matches("^RTQ4[0-9]{3}.*") ||      // RTQ4xxx
           mpn.matches("^RTQ8[45][0-9]{2}.*");    // RTQ84xx, RTQ85xx
}

// RTQ prefix indicates AEC-Q100 automotive qualification
// Also check for -AEC suffix
public boolean isAutomotiveGrade(String mpn) {
    String upper = mpn.toUpperCase();
    return upper.startsWith("RTQ") || upper.contains("-AEC");
}

// RTQ6150 is automotive version of RT6150
// Check for equivalent parts with/without Q
private boolean areEquivalentParts(String mpn1, String mpn2) {
    // RTQ6150 <-> RT6150
    if (mpn1.startsWith("RTQ") && mpn2.startsWith("RT") && !mpn2.startsWith("RTQ")) {
        String num1 = mpn1.substring(3, 7);  // 4-digit from RTQxxxx
        String num2 = mpn2.substring(2, 6);  // 4-digit from RTxxxx
        return num1.equals(num2);
    }
}