Agent skill

elna

Elna Company MPN encoding patterns, suffix decoding, and handler guidance. Use when working with Elna audio-grade aluminum electrolytic capacitors and supercapacitors.

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npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/elna

SKILL.md

Elna Company Manufacturer Skill

MPN Structure

Elna MPNs follow this general structure for capacitors:

[SERIES]-[VOLTAGE]V[CAP_CODE][TOL][PACKAGE]#[SUFFIX]
   |         |        |       |      |        |
   |         |        |       |      |        +-- Optional suffix (P, etc.)
   |         |        |       |      +-- Package code (H3, F5, etc.)
   |         |        |       +-- Tolerance (M=20%)
   |         |        +-- Capacitance code (101=100uF or R notation)
   |         +-- Voltage rating
   +-- Series prefix (RFS, ROA, RE3, etc.)

Example Decoding

RFS-25V101MH3#P
|   | |  | | |
|   | |  | | +-- P suffix (packaging option)
|   | |  | +-- H3 = 5x11mm package
|   | |  +-- M = +/-20% tolerance
|   | +-- 101 = 100uF (10 x 10^1)
|   +-- 25V
+-- RFS = Silmic II (premium audio grade)

ROA-50V4R7MF3#
|   | |  | |
|   | |  | +-- F3 = 5x7mm package
|   | |  +-- M = +/-20% tolerance
|   | +-- 4R7 = 4.7uF (R notation)
|   +-- 50V
+-- ROA = TONEREX Type A (audio grade)

DB-5R5D105T
|  | | |  |
|  | | |  +-- T = Radial THT package
|  | | +-- 105 = 1F (10 x 10^5 = 1,000,000uF = 1F)
|  | +-- D suffix (EDLC type)
|  +-- 5R5 = 5.5V (R notation)
+-- DB = Dynacap Standard (supercapacitor/EDLC)

Series Reference

Audio Grade Series

Series Name Description
RFS Silmic II Premium audio-grade, silk fiber separator
ROA TONEREX Type A High-quality audio capacitor
ROB TONEREX Type B High-quality audio capacitor
CE-BP CE-BP Audio Crossover Bi-polar for speaker crossovers

Standard Aluminum Electrolytic

Series Name Description
RE3 RE3 Standard General purpose aluminum electrolytic
RJ3 RJ3 Standard Standard aluminum electrolytic
RJH RJH High Temp High temperature (105C)

Specialized Series

Series Name Description
RBD RBD Bi-Polar Non-polar electrolytic
RBI RBI Bi-Polar Non-polar electrolytic
RSE RSE Super Low ESR Ultra-low ESR
RVD RVD Low Leakage Low leakage current
RVE RVE Low Leakage Low leakage current

Dynacap (EDLC/Supercapacitors)

Series Name Description
DB Dynacap Standard Standard EDLC
DX Dynacap Low Profile Low profile EDLC
DZ Dynacap Ultra-Low Profile Ultra-low profile EDLC

Legacy/STARGET Series

Series Name Description
LAO STARGET Audio Legacy audio series
LAS STARGET Standard Legacy standard series

Capacitance Codes

EIA 3-Digit Code

Code Value Calculation
100 10uF 10 x 10^0
101 100uF 10 x 10^1
221 220uF 22 x 10^1
471 470uF 47 x 10^1
102 1000uF 10 x 10^2

R Notation (decimal placement)

Code Value
1R0 1.0uF
2R2 2.2uF
4R7 4.7uF
10R 10uF
R47 0.47uF

Dynacap (high values)

Code Value
105 1F (10 x 10^5 uF)
225 2.2F
475 4.7F
106 10F

Package Codes

Dimension Codes (R-series)

First letter indicates diameter range, digit indicates height:

Code Dimensions Notes
H3 5x11mm Small radial
H5 6.3x11mm Standard radial
H7 8x11.5mm Medium radial
F3 5x7mm Low profile
F5 6.3x7mm Low profile
L5 10x12.5mm Large radial
L7 10x16mm Large radial tall
M5 12.5x15mm Extra large
M8 12.5x20mm Extra large tall
P5 16x25mm Power
P8 16x31.5mm Power tall
Q5 18x25mm High power
R5 22x25mm Very high power

Dynacap Package Suffixes

Suffix Package Type
T Radial THT
V Vertical SMD
H Horizontal SMD
C Coin Cell

Handler Implementation Notes

Pattern Recognition

java
// Silmic II series
"^RFS-[0-9]+V[0-9A-Z]+.*"

// TONEREX series
"^RO[AB]-[0-9]+V[0-9A-Z]+.*"

// Standard R-series (RE3, RJ3, RJH, RBD, RBI, RSE, RVD, RVE)
"^R[A-Z]{2}-[0-9]+V.*"

// Dynacap series
"^D[BXZ]-[0-9]+R[0-9]+[A-Z][0-9]+.*"  // With R voltage notation
"^D[BXZ][0-9]+.*"                      // Alternative format

// Legacy STARGET series
"^LA[OS][0-9]+.*"

// CE-BP bi-polar
"^CE-BP.*"

Voltage Extraction

java
// R-series: extract digits between hyphen and V
// RFS-25V101MH3#P -> 25
int dashIdx = mpn.indexOf('-');
String afterDash = mpn.substring(dashIdx + 1);
int vIdx = afterDash.indexOf('V');
String voltage = afterDash.substring(0, vIdx);  // "25"

// Dynacap: R notation for voltage
// DB-5R5D105T -> 5.5V (5R5)

Capacitance Extraction

java
// After V, before M (tolerance)
// RFS-25V101MH3#P -> 101 (100uF)
// ROA-50V4R7MF3# -> 4R7 (4.7uF)
int vIdx = mpn.indexOf('V');
String afterV = mpn.substring(vIdx + 1);
int mIdx = afterV.indexOf('M');
String capCode = afterV.substring(0, mIdx);  // "101" or "4R7"

Package Code Extraction

java
// R-series: 2-char code after M and before #
// RFS-25V101MH3#P -> H3
int mIdx = mpn.indexOf('M');
String suffix = mpn.substring(mIdx + 1);
int hashIdx = suffix.indexOf('#');
String packagePart = hashIdx > 0 ? suffix.substring(0, hashIdx) : suffix;
String packageCode = packagePart.substring(0, 2);  // "H3"

Replacement Rules

The handler supports these replacement scenarios:

  1. Silmic II can replace TONEREX: Higher grade audio capacitor
  2. TONEREX Type A and Type B: Interchangeable within same specs
  3. Same series: Compatible if voltage and capacitance match

All replacements require matching voltage and capacitance.

Related Files

  • Handler: manufacturers/ElnaHandler.java
  • Component types: CAPACITOR
  • Supported types: CAPACITOR, IC

Audio Capacitor Notes

Elna is renowned for audio-grade capacitors. Key characteristics:

  1. Silmic II (RFS): Uses silk fiber separator, lowest distortion
  2. TONEREX (ROA/ROB): Good balance of performance and cost
  3. CE-BP: Bi-polar design for speaker crossover networks

Audio capacitors are often specified by:

  • Low ESR (Equivalent Series Resistance)
  • Low distortion characteristics
  • High-quality dielectric materials

Learnings & Edge Cases

  • Hash suffix: Many Elna MPNs end with # or #P for packaging options
  • R notation: Used for decimal values (4R7=4.7, 5R5=5.5)
  • Series pattern: All R-series use R[A-Z]{2}- format
  • Dynacap voltage: Uses R notation (5R5=5.5V) not standard format
  • Audio grade priority: Silmic II > TONEREX > Standard for audio quality
  • Bi-polar types: RBD, RBI, CE-BP are non-polar (no polarity requirement)

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