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.

| Part | Description | Features | |------|-------------|----------| | CM108 | USB stereo codec | Basic stereo | | CM108AH | Enhanced version | Higher quality | | CM108B | Cost-optimized | Lower cost |

CM109 Series - USB Audio with HID

USB audio with keyboard/HID controller for headsets.

| Part | Description | |------|-------------| | CM109 | USB audio + HID keyboard | | CM109A | Enhanced variant |

CM119 Series - USB 7.1 Channel Audio

Multi-channel USB audio for gaming and surround sound.

| Part | Description | Channels | |------|-------------|----------| | CM119 | 7.1 USB audio | 8 | | CM119A | Enhanced version | 8 | | CM119B | Cost-optimized | 8 |

CM6xxx Series - Professional USB Audio

Higher-end USB audio ICs for professional applications.

| Part | Description | |------|-------------| | CM6206 | USB 2.0 basic audio | | CM6400 | USB audio controller | | CM6631 | USB 2.0 audio processor | | CM6631A | Enhanced CM6631 | | CM6632 | USB audio DAC |

CMI87xx Series - HD Audio Codec (PCI/PCIe)

HD audio codecs for motherboards and sound cards.

| Part | Description | Features | |------|-------------|----------| | CMI8738 | PCI audio codec | Legacy 7.1 | | CMI8768 | PCI-E audio | 7.1 surround | | CMI8788 | Oxygen HD Audio | High-end 8-ch |

CMI83xx Series - Legacy PCI Audio

Older PCI audio codecs.

| Part | Description | |------|-------------| | CMI8330 | Legacy PCI audio |

Package Codes

| Code | Package | Notes | |------|---------|-------| | QFP | QFP | Quad flat package | | LQFP, LQ | LQFP | Low-profile QFP | | QFN | QFN | Quad flat no-lead | | SSOP, S | SSOP | Shrink small outline | | TQFP | TQFP | Thin QFP | | PLCC | PLCC | Plastic leadless | | BGA | BGA | Ball grid array |

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

| Suffix | Meaning | |--------|---------| | A | First variant revision | | AH | Enhanced variant | | B | Second variant (often cost-optimized) |

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

| MPN | Description | Application | |-----|-------------|-------------| | CM108AH | USB stereo codec | USB headsets | | CM109 | USB audio + HID | Gaming headsets | | CM119 | USB 7.1 audio | Gaming audio | | CM6631A | USB 2.0 audio processor | USB DACs | | CM6632 | USB audio DAC | External audio | | CMI8788 | Oxygen HD Audio | Sound cards |

USB Class Compliance

| Series | USB Class | Driver Required | |--------|-----------|-----------------| | CM108 | USB Audio Class 1.0 | No (driverless) | | CM119 | USB Audio Class 1.0 | No (driverless) | | CM6631 | USB Audio Class 2.0 | Yes (on Windows) |

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.