Murata Part Number Reference

MPN Structure Overview

Murata part numbers follow a structured format that varies by product family:

•GRM/GCM: Multilayer Ceramic Chip Capacitors (MLCC)
•LQM/LQW/LQG: Chip Inductors
•BLM: Ferrite Beads
•NFM: EMI Suppression Filters
•DFE: Power Inductors
•DLW: Common Mode Choke Coils

MLCC Capacitor Format (GRM/GCM Series)

code

GRM [Size] [Temp] [Voltage] [Value] [Tolerance] [Packaging]
 |    |      |       |        |         |           |
 |    |      |       |        |         |           +-- Packaging code
 |    |      |       |        |         +-- Tolerance (J=5%, K=10%, M=20%)
 |    |      |       |        +-- Capacitance value
 |    |      |       +-- Voltage rating code
 |    |      +-- Temperature characteristic
 |    +-- Case size (188=0603, 155=0402, 21=0805)
 +-- Series (GRM=Standard, GCM=Automotive)

Example Decoding

code

GRM188R71H104KA93D
 |   |  | |  |  ||+-- Packaging (D=7" reel)
 |   |  | |  |  |+-- Reserved
 |   |  | |  |  +-- Tolerance (K=10%)
 |   |  | |  +-- Capacitance (104=100nF)
 |   |  | +-- Voltage (1H=50V)
 |   |  +-- Temperature characteristic (R7=X7R)
 |   +-- Case size (188=0603)
 +-- Series (GRM=Standard MLCC)

Size Codes (Case Size)

Code	Metric	Imperial	Notes
033	0201	01005	Ultra-small
055	0402	0201	Very small
155	0402	0201	Standard
188	0603	0402	Common
21	0805	0402	Standard
31	1206	0603	Common
32	1210	0805	Large
55	2220	1210	High capacity

Temperature Characteristics

Code	Characteristic	Temp Range	Tolerance
C0	C0G/NPO	-55C to +125C	0 ppm/C
R7	X7R	-55C to +125C	+/-15%
R6	X5R	-55C to +85C	+/-15%
F1	Y5V	-30C to +85C	+22%/-82%

Voltage Rating Codes

Code	Voltage
0J	6.3V
1C	16V
1E	25V
1H	50V
2A	100V
2E	250V
2J	630V

Inductor Series (LQx)

LQM - Metal Power Inductors

code

LQM [Size] [Type] [Value] [Tolerance] [Packaging]

LQW - Wire Wound Inductors

code

LQW [Size] [Type] [Value] [Tolerance] [Packaging]

LQG - RF Chip Inductors

code

LQG [Size] [Type] [Value] [Tolerance] [Packaging]

EMI Components

BLM - Ferrite Beads

code

BLM [Size] [Series] [Impedance] [Current] [Packaging]

NFM - EMI Filters

code

NFM [Size] [Type] [Cutoff] [Rating] [Packaging]

Handler Implementation Notes

Package Code Extraction

The handler extracts size codes from positions 3-6 for GRM/GCM series:

java

// GRM/GCM series
if (mpn.startsWith("GRM") || mpn.startsWith("GCM")) {
    return mpn.substring(3, 6);  // Size code like "188", "155"
}

// LQx series inductors
if (mpn.matches("^LQ[MGW].*")) {
    return mpn.substring(3, 7);  // Size code like "2012"
}

Series Extraction

java

// GRM/GCM/KC series capacitors
if (mpn.matches("^(?:GRM|GCM|KC[ABMZ]).*")) {
    return mpn.substring(0, 6);  // Include size code
}

// LQx series inductors
if (mpn.matches("^LQ[MGW].*")) {
    return mpn.substring(0, 7);  // Include size code
}

Supported ComponentTypes

java

ComponentType.CAPACITOR
ComponentType.CAPACITOR_CERAMIC_MURATA
ComponentType.INDUCTOR
ComponentType.INDUCTOR_CHIP_MURATA
ComponentType.INDUCTOR_POWER_MURATA
ComponentType.EMI_FILTER_MURATA
ComponentType.COMMON_MODE_CHOKE_MURATA

Known Handler Issues

1. HashSet in getSupportedTypes()

Uses mutable HashSet instead of Set.of():

java

Set<ComponentType> types = new HashSet<>();  // Should be Set.of()

2. Pattern Anchoring

Some patterns use $ anchor which may miss parts with additional suffixes.

3. Limited Series Coverage

Only covers GRM, GCM, KC, LQM, LQW, LQG, DFE, BLM, NFM, DLW series. Missing resonators, sensors, and other Murata products.

Test Patterns

Valid MLCC MPNs

code

GRM188R71H104KA93D
GRM155R71C104KA88D
GCM188R71H104KA93D
GRM21BR71A105KA73L
GRM31CR71H475KA88L

Valid Inductor MPNs

code

LQM2MPN2R2MG0L
LQW18AN2N2D00D
LQG15HS2N2S02D
DFE201612P-1R0M

Valid EMI MPNs

code

BLM15AG121SN1D
NFM41PC104R1E3L
DLW5BTM102SQ2L

Related Files

•Handler: manufacturers/MurataHandler.java
•Component types: CAPACITOR_CERAMIC_MURATA, INDUCTOR_CHIP_MURATA, INDUCTOR_POWER_MURATA, EMI_FILTER_MURATA, COMMON_MODE_CHOKE_MURATA
•Test: handlers/MurataHandlerTest.java

Learnings & Edge Cases

•GCM series is automotive grade, same structure as GRM
•KC series is high voltage MLCC with slightly different prefix pattern
•Inductor size codes are 4 digits (e.g., 2012) vs capacitor 3 digits (e.g., 188)
•Packaging codes vary: D=7" reel, J=13" reel, B=bulk, etc.
•Temperature characteristics determine voltage derating behavior