Elna Company Manufacturer Skill

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

Standard Aluminum Electrolytic

Specialized Series

Dynacap (EDLC/​Supercapacitors)

Legacy/​STARGET Series

---

Capacitance Codes

EIA 3-Digit Code

R Notation (decimal placement)

Dynacap (high values)

---

Package Codes

Dimension Codes (R-series)

First letter indicates diameter range, digit indicates height:

Dynacap Package Suffixes

---

Handler Implementation Notes

Pattern Recognition

// 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

// 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

// 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

// 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)

<!-- Add new learnings above this line -->