Sumida Corporation Manufacturer Skill

Overview

Sumida Corporation is a leading manufacturer of magnetic components, specializing in:

• Power Inductors - SMD and through-hole designs for DC-DC converters
• Drum Core Inductors - High current applications
• Shielded Inductors - EMI-sensitive designs
• Chip Inductors - Compact surface mount applications
• Common Mode Chokes - EMI/EMC filtering
• Edge-Wound Inductors - High frequency applications

MPN Structure

Sumida MPNs follow this general structure:

[SERIES][SIZE][SUFFIX]-[VALUE][TOLERANCE][TERMINATION]
   |      |      |        |       |          |
   |      |      |        |       |          +-- Termination code (NC, MC, etc.)
   |      |      |        |       +-- Tolerance: M=+/-20%, N=+/-30%, J=+/-5%
   |      |      |        +-- Inductance value (R-notation: 4R7 = 4.7uH)
   |      |      +-- Optional suffix (NP=Non-magnetic, etc.)
   |      +-- Size code (series-dependent encoding)
   +-- Series prefix (CDRH, CDR, CDEP, CR, CLF, etc.)

Example Decoding

CDRH6D28NP-4R7NC
|   |  | |  |  |
|   |  | |  |  +-- NC = Non-magnetic terminals
|   |  | |  +-- 4R7 = 4.7uH inductance (R = decimal)
|   |  | +-- NP = Non-magnetic core/shield
|   |  +-- 28 = 2.8mm height
|   +-- 6D = 6mm x 6mm footprint
+-- CDRH = SMD Power Inductor series

CDR125NP-100MC
|  |  | |  |
|  |  | |  +-- MC = Magnetic terminals
|  |  | +-- 100 = 10uH (EIA code: 10 x 10^0)
|  |  +-- NP = Non-magnetic
|  +-- 125 = 12.5mm diameter drum
+-- CDR = Drum Core Inductor series

Product Series

SMD Power Inductors

Drum Core Inductors

Chip Inductors

EMI Components

Inductance Value Code

Sumida uses two notation systems for inductance values:

R-Notation (Primary)

The "R" character represents the decimal point:

EIA 3-Digit Code

Standard EIA multiplier format (first two digits x 10^third digit):

Tolerance Codes

Termination Codes

Size Code Reference by Series

CDRH Series Size Codes

CDRH uses format [L]D[H] where L=length/width, D=delimiter, H=height:

Height decoding: 28 = 2.8mm, 43 = 4.3mm, 58 = 5.8mm

CDR Series Size Codes

CDR uses diameter encoding:

CDEP Series Size Codes

CDEP uses format [WW][H] where WW=width, H=height:

CR Series Size Codes

CR chip inductors use millimeter encoding:

CLF Series Size Codes

CLF uses format [LL][WW][H] (5 digits):

Package Code Extraction

The handler extracts and decodes size codes to human-readable dimensions:

Series Extraction

The handler extracts the series prefix (without size code):

Series Extraction Order (Important)

Due to prefix overlap, series must be checked in this order:

1. CDRH (before CDR)
2. CDEP (before CDE)
3. CDEF (before CDE)
4. CDC
5. CDR (generic CD prefix)
6. CLF
7. CR
8. RCH
9. CEP

Supported Component Types

The SumidaHandler supports:

• ComponentType.INDUCTOR - Base inductor type

Note: Sumida does not have a manufacturer-specific inductor type (e.g., INDUCTOR_SUMIDA) in this codebase.

Example MPNs with Full Decoding

CDRH6D28NP-4R7NC

Series:      CDRH (SMD Power Inductor)
Size:        6D28 (6.0mm x 6.0mm x 2.8mm)
Suffix:      NP = Non-magnetic core
Inductance:  4R7 = 4.7 uH
Tolerance:   N = +/- 30%
Termination: C = Standard

Full Series: CDRH
Package:     6x6x2.8mm

CDR125NP-100MC

Series:      CDR (Drum Core Inductor)
Size:        125 (12.5mm diameter)
Suffix:      NP = Non-magnetic core
Inductance:  100 = 10 x 10^0 = 10 uH
Tolerance:   M = +/- 20%
Termination: C = Standard

Full Series: CDR
Package:     12.5mm

CDEP104NP-1R5MC

Series:      CDEP (Shielded SMD Power Inductor)
Size:        104 (10.0mm x 10.0mm x 4.0mm)
Suffix:      NP = Non-magnetic core
Inductance:  1R5 = 1.5 uH
Tolerance:   M = +/- 20%
Termination: C = Standard

Full Series: CDEP
Package:     10x10x4mm

CR21-100JM

Series:      CR (Chip Inductor)
Size:        21 (2.1mm x 1.2mm, ~0805)
Inductance:  100 = 10 uH
Tolerance:   J = +/- 5%
Suffix:      M = (variant)

Full Series: CR
Package:     2.1mm

CLF10040-470MC

Series:      CLF (Low Profile Power Inductor)
Size:        10040 (10.0mm x 10.0mm x 4.0mm)
Inductance:  470 = 47 x 10^0 = 47 uH
Tolerance:   M = +/- 20%
Termination: C = Standard

Full Series: CLF
Package:     10x10x4.0mm

CDC2G2NP-100MC

Series:      CDC (Common Mode Choke)
Size:        2G2 (variant designation)
Suffix:      NP = Non-magnetic core
Inductance:  100 = 10 uH
Tolerance:   M = +/- 20%
Termination: C = Standard

Full Series: CDC
Package:     2G2

Handler Implementation Notes

Pattern Matching

// Sumida patterns have series-specific structures:
// CDRH series: CDRH + size code (nDnn format) + optional suffix + hyphen + value
"^CDRH[0-9]+[A-Z]?[0-9]*[A-Z]*-?[0-9R]+[A-Z]*$"

// CDR drum core: CDR + size code (2-3 digits) + optional suffix + hyphen + value
"^CDR[0-9]+[A-Z]*-?[0-9R]+[A-Z]*$"

// CR chip: CR + size (2 digits) + hyphen + value
"^CR[0-9]+[A-Z]*-?[0-9R]+[A-Z]*$"

// Combined pattern for quick Sumida detection:
"^(CDRH|CDR|CDEP|CDEF|CR|RCH|CEP|CDC|CLF)[0-9A-Z]+-?[0-9R]*[A-Z]*$"

Inductance Value Extraction

The handler includes extractInductanceValue() method that:

1. Finds the value portion after the hyphen
2. Parses R-notation (4R7 = 4.7uH, R47 = 0.47uH, 10R = 10uH)
3. Parses EIA 3-digit code (100 = 10uH, 101 = 100uH)
4. Returns formatted string (e.g., "4.7uH", "10uH")

Official Replacement Check

Two Sumida parts are considered official replacements if:

1. Same series (e.g., both CDRH)
2. Same inductance value (e.g., both 4.7uH)

Different size codes, tolerances, or termination options are NOT automatic replacements because they affect electrical performance and footprint compatibility.

Utility Methods

The handler provides additional helper methods:

// Check if MPN is a Sumida inductor
boolean isSumidaInductor(String mpn)

// Get human-readable inductor type description
String getInductorTypeDescription(String mpn)
// Returns: "SMD Power Inductor", "Drum Core Inductor", etc.

Related Files

• Handler: manufacturers/SumidaHandler.java
• Component types: ComponentType.INDUCTOR
• Tests: Check for SumidaHandlerTest.java in handlers package

Learnings & Edge Cases

• Hyphen is optional: MPNs may appear as CDRH6D28NP-4R7NC or CDRH6D28NP4R7NC
• R-notation ambiguity: 10R means 10uH (R as terminator), but 1R0 also means 1.0uH (R as decimal)
• NP suffix common: Most Sumida inductors use NP (non-magnetic) suffix before the value separator
• CDC series alphanumeric: CDC series uses alphanumeric size codes (e.g., CDC2G2) unlike numeric-only codes in other series
• CDRH vs CDR prefix: CDRH is the SMD variant, CDR is drum core - pattern matching must check CDRH first to avoid false CDR match
• Series check order matters: Due to prefix overlaps (CDRH/CDR, CDEP/CDEF/CDC), check longer prefixes before shorter ones
• Height encoding varies: CDRH uses 2-digit encoding (28=2.8mm), CDEP uses 1-digit (4=4mm), CLF uses 2-digit different format
• getSupportedTypes() uses Set.of(): Handler correctly uses immutable Set.of() pattern (not HashSet)
• No manufacturer-specific type: Unlike some handlers, Sumida only uses base INDUCTOR type, not INDUCTOR_SUMIDA

Common MPN Variants

CDRH6D28NP-4R7NC   - Standard shielded SMD
CDRH6D28NP-4R7MC   - Magnetic terminals
CDRH6D28-4R7NC    - No NP suffix
CDRH6D284R7NC     - No hyphen separator

Size Code Decoding Edge Cases

The size code decoding assumes specific formats:

• CDRH: [L]D[HH] - Letter D is always delimiter, not "10" like "10D43"
• CDR: Pure numeric diameter
• CDEP: [WW][H] - First 2 digits are width, last is height
• CLF: [LL][WW][H] - Format may vary for different sizes

When decoding produces unexpected results, verify against datasheet.