cmedia

name: cmedia description: C-Media Electronics MPN encoding patterns, USB audio controller decoding, and handler guidance. Use when working with C-Media audio ICs or CMediaHandler.

C-Media Electronics Manufacturer Skill

MPN Structure

C-Media specializes in USB and HD audio controller ICs.

CM Series (USB Audio)

CM[SERIES][VARIANT]-[PACKAGE][PINS]
   |   |      |        |       |
   |   |      |        |       +-- Pin count (optional)
   |   |      |        +-- Package code (QFP, LQFP, etc.)
   |   |      +-- Variant (A, AH, B)
   |   +-- Series (108, 109, 119, 6xxx)
   +-- CM = C-Media prefix

CMI Series (HD/PCI Audio)

CMI[SERIES][VARIANT]
    |   |      |
    |   |      +-- Variant suffix
    |   +-- Series (8738, 8768, 8788)
    +-- CMI = C-Media Interface

Example Decoding

CM108AH
|  | ||
|  | |+-- H = variant revision
|  | +-- A = first variant
|  +-- 108 = Basic USB stereo audio codec
+-- CM = C-Media prefix

CM6631A-S
|  |   ||
|  |   |+-- S = SSOP package
|  |   +-- A = variant
|  +-- 6631 = Professional USB 2.0 audio processor
+-- CM = C-Media prefix

CMI8788
|   |||
|   ||+-- 8 = series number
|   |+-- 8 = 8-channel HD audio
|   +-- 87 = HD audio codec series
+-- CMI = C-Media Interface

Product Families

CM108 Series - Basic USB Audio Codec

Entry-level USB stereo audio for PC peripherals.

CM109 Series - USB Audio with HID

USB audio with keyboard/HID controller for headsets.

CM119 Series - USB 7.1 Channel Audio

Multi-channel USB audio for gaming and surround sound.

CM6xxx Series - Professional USB Audio

Higher-end USB audio ICs for professional applications.

CMI87xx Series - HD Audio Codec (PCI/PCIe)

HD audio codecs for motherboards and sound cards.

CMI83xx Series - Legacy PCI Audio

Older PCI audio codecs.

Package Codes

Package Code Extraction

// Handle hyphenated suffixes
// CM6631A-LQ -> LQFP
// CM6631A-S -> SSOP

// Handle embedded package codes
// After variant letters, look for package indicators

Variant Suffixes

Handler Implementation Notes

Series Extraction

// CM108, CM109, CM119 - return 5 characters
if (upperMpn.matches("^CM108.*")) return "CM108";
if (upperMpn.matches("^CM109.*")) return "CM109";
if (upperMpn.matches("^CM119.*")) return "CM119";

// CM6xxx - return 6 characters (CM + 4 digits)
if (upperMpn.matches("^CM6[0-9]{3}.*")) {
    return upperMpn.substring(0, 6);  // CM6631
}

// CMI87xx - return 7 characters (CMI + 4 digits)
if (upperMpn.matches("^CMI87[0-9]{2}.*")) {
    return upperMpn.substring(0, 7);  // CMI8788
}

Base Part Number Extraction

// Include variant letters in base part
// CM108AH -> CM108AH
// CM6631A -> CM6631A

// Stop at package indicators
if (remaining.matches("^(QFP|LQFP|QFN|SSOP|TQFP).*")) {
    break;
}

Matching Patterns

// CM10x series
"^CM10[89][A-Z]*.*"

// CM119 series
"^CM119[A-Z]*.*"

// CM6xxx series
"^CM6[0-9]{3}[A-Z]*.*"

// CMI87xx series
"^CMI87[0-9]{2}[A-Z]*.*"

// CMI83xx series
"^CMI83[0-9]{2}[A-Z]*.*"

Replacement Rules

Same Series Variants

Parts in the same series with different variants (A, AH, B) are generally compatible:

• CM108 -> CM108A -> CM108AH (increasing quality)
• CM119 -> CM119A -> CM119B (same features, different optimization)

Different Series

Different series are NOT compatible (different USB classes, channel counts):

• CM6206 != CM6631 (different USB audio implementations)
• CM108 != CM119 (stereo vs 7.1 channel)

Related Files

• Handler: manufacturers/CMediaHandler.java
• Component types: ComponentType.IC

Common MPNs

USB Class Compliance

Applications

• USB headsets
• USB sound cards
• Gaming audio devices
• USB DACs
• Webcams with audio
• Conference devices
• PCI/PCIe sound cards
• Motherboard audio

Learnings & Edge Cases

• CM vs CMI prefix: CM = USB audio controllers, CMI = PCI/PCIe HD audio codecs.
• USB Class matters: CM108/CM119 are class-compliant (driverless), CM6631 needs drivers on Windows.
• 7.1 channel support: CM119 series is for 7.1 surround, CM108 is stereo only.
• HID keyboard support: CM109 has integrated HID controller for headset buttons/volume.
• CMI8788 "Oxygen": High-end part used in audiophile sound cards (Asus Xonar, etc.).
• Variant progression: A < AH < B is not always quality progression - check datasheets.
• Package suffix position: Package code comes after variant letter(s) in hyphenated format.