name: iqd description: IQD Frequency Products MPN encoding patterns, package decoding, and handler guidance. Use when working with IQD crystals, oscillators, TCXOs, VCXOs, or OCXOs.

IQD Frequency Products Manufacturer Skill

Manufacturer Overview

IQD (International Quartz Devices) is a UK-based manufacturer specializing in frequency control products. Their product range includes:

• Crystals: Low frequency, standard, SMD, and through-hole crystal units
• Oscillators: Standard clock oscillators (XO)
• TCXOs: Temperature Compensated Crystal Oscillators
• VCXOs: Voltage Controlled Crystal Oscillators
• OCXOs: Oven Controlled Crystal Oscillators
• Clock Modules: Integrated timing solutions
• RTC Modules: Real-Time Clock modules
• Filters: Crystal filters, SAW filters, resonator bandpass

MPN Structure

IQD MPNs follow product-family-specific structures:

Crystal Units

[PREFIX][SIZE]-[FREQUENCY]-[TOLERANCE]-[LOAD]-[TEMP]
   |      |        |           |        |       |
   |      |        |           |        |       +-- Temperature range
   |      |        |           |        +-- Load capacitance
   |      |        |           +-- Frequency tolerance (PPM)
   |      |        +-- Frequency value
   |      +-- Size code (e.g., 016, 020, 032)
   +-- Series prefix (CFPX, XTALS, XTAL, LFXTAL)

Oscillators (XO, TCXO, VCXO, OCXO)

[PREFIX]-[SIZE][SPEC]-[FREQUENCY]-[STABILITY]-[OUTPUT]
   |       |     |         |          |          |
   |       |     |         |          |          +-- Output type
   |       |     |         |          +-- Stability (PPM)
   |       |     |         +-- Frequency value
   |       |     +-- Specification variant (H=High freq, L=Low power)
   |       +-- Package size code (21, 25, 32, 50, 70, 90)
   +-- Family prefix (IQXO, IQTX, IQVCXO, IQOCXO)

Example Decoding

Crystal Examples

CFPX-032-16.000MHz-10ppm
|    |      |        |
|    |      |        +-- 10 PPM frequency tolerance
|    |      +-- 16.000 MHz frequency
|    +-- 032 = 3.2 x 2.5mm package
+-- Standard Crystal series

XTALS-020-8.000MHz
|     |      |
|     |      +-- 8.000 MHz frequency
|     +-- 020 = 2.0 x 1.6mm package
+-- SMD Crystal series

LFXTAL-25.000kHz
|        |
|        +-- 25.000 kHz (low frequency)
+-- Low Frequency Crystal series

Oscillator Examples

IQXO-32-16.000MHz
|    |     |
|    |     +-- 16.000 MHz output frequency
|    +-- 32 = 3.2 x 2.5mm package
+-- Standard Oscillator

IQXO-L50-1.000MHz
|    ||    |
|    ||    +-- 1.000 MHz frequency
|    |+-- 50 = 5.0 x 3.2mm package
|    +-- L = Low Power variant
+-- Low Power Oscillator

IQTX-H25-10.000MHz-0.5PPM
|    ||     |         |
|    ||     |         +-- 0.5 PPM stability
|    ||     +-- 10.000 MHz frequency
|    |+-- 25 = 2.5 x 2.0mm package
|    +-- H = High Stability variant
+-- High Stability TCXO

IQVCXO-32-100.000MHz
|      |      |
|      |      +-- 100.000 MHz center frequency
|      +-- 32 = 3.2 x 2.5mm package
+-- Voltage Controlled Crystal Oscillator

IQOCXO-H70-10.000MHz-1PPB
|      ||     |        |
|      ||     |        +-- 1 PPB (parts per billion) stability
|      ||     +-- 10.000 MHz frequency
|      |+-- 70 = 7.0 x 5.0mm package
|      +-- H = High Stability variant
+-- High Stability Oven Controlled Crystal Oscillator

Module Examples

IQCM-100-25.000MHz
|       |     |
|       |     +-- 25.000 MHz output
|       +-- Series/variant code
+-- Clock Module

IQRTC-32768Hz
|        |
|        +-- 32.768 kHz (standard RTC frequency)
+-- RTC Module

IQXF-455kHz
|      |
|      +-- 455 kHz center frequency
+-- Crystal Filter

IQSPF-100.000MHz
|       |
|       +-- 100.000 MHz center frequency
+-- SAW Filter

Package Codes

Crystal Packages (CFPX, XTALS series)

Size codes appear after a dash and indicate package dimensions:

Oscillator Packages (IQXO, IQTX, IQVCXO, IQOCXO series)

Size codes appear after the dash (or after H/L modifier):

Component Type Prefixes

Crystal Prefixes

Oscillator Prefixes

Module and Filter Prefixes

Supported Component Types

The IQDHandler supports these component types:

Handler Implementation Notes

Package Code Extraction

// For crystals (CFPX, XTALS), size code is 3 digits after dash
// CFPX-032-16.000MHz → dashIndex=4, extract positions 5-7 → "032"
int dashIndex = upperMpn.indexOf('-');
if (dashIndex > 0 && dashIndex + 4 <= upperMpn.length()) {
    String sizeCode = upperMpn.substring(dashIndex + 1, dashIndex + 4);
    // Map to readable format
}

// For oscillators (IQXO, IQTX, etc.), size code is 2 digits
// Split by dash, take first 2 chars of second part
// IQXO-32-16.000MHz → parts[1]="32..." → pkgCode="32"
String[] parts = upperMpn.split("-");
if (parts.length >= 2) {
    String pkgCode = parts[1].substring(0, 2);
    // Map to readable format
}

Series Extraction

// Series extraction uses prefix matching with variant detection
// More specific variants (H, L) checked before base prefix

if (upperMpn.startsWith("IQXO")) {
    if (upperMpn.startsWith("IQXO-H")) return "High Frequency Oscillator";
    if (upperMpn.startsWith("IQXO-L")) return "Low Power Oscillator";
    return "Standard Oscillator";  // Base case last
}

if (upperMpn.startsWith("IQTX")) {
    if (upperMpn.startsWith("IQTX-H")) return "High Stability TCXO";
    if (upperMpn.startsWith("IQTX-L")) return "Low Power TCXO";
    return "Standard TCXO";
}

Replacement Compatibility Logic

// IQDHandler implements sophisticated replacement logic:
// 1. Same series required (or compatible upgrade)
// 2. Same package size required
// 3. Same frequency required
// 4. Better or equal stability allowed

// Compatible upgrades:
// - High Stability can replace Standard (e.g., IQTX-H → IQTX)
// - Low Power variants may be compatible with Standard

// Stability comparison:
// Lower PPM value = better stability
// A 0.5 PPM part can replace a 2.5 PPM part

Stability Grades

Frequency stability is a key specification for timing products:

Common Frequency Values

Standard Crystal Frequencies

Standard Oscillator Frequencies

Related Files

• Handler: manufacturers/IQDHandler.java
• Component types: CRYSTAL, CRYSTAL_IQD, OSCILLATOR, OSCILLATOR_IQD, OSCILLATOR_TCXO_IQD, OSCILLATOR_VCXO_IQD, OSCILLATOR_OCXO_IQD, CRYSTAL_FILTER_IQD, RTC_MODULE_IQD

Known Issues (Technical Debt)

The IQDHandler has these documented issues:

1. HashSet in getSupportedTypes() - Should use Set.of() for immutability
2. Missing IC type - Handler registers patterns for ComponentType.IC (clock modules, RTC, filters) but does not include IC in getSupportedTypes()
3. No handler tests - Listed in handlers without tests in CLAUDE.md

Learnings & Quirks

• Variant modifiers (H, L): Appear between prefix and size code (e.g., IQXO-H32 vs IQXO-32). The handler correctly checks for these before falling back to base series.
• Package extraction differs by product type: Crystals use 3-digit codes after dash, oscillators use 2-digit codes. The handler splits logic based on prefix.
• Replacement compatibility: IQD handler includes sophisticated replacement logic that considers stability grades - better stability parts can replace worse ones but not vice versa.
• PPM vs PPB: OCXOs use parts-per-billion (PPB) while other products use parts-per-million (PPM). Both are extracted as stability grades.
• IQTX vs IQXO: Easy to confuse - IQTX is TCXO (Temperature Compensated), IQXO is standard XO (crystal oscillator).
• Missing IC in getSupportedTypes(): Clock modules (IQCM), RTC modules (IQRTC), and filters (IQXF, IQSPF, IQRB) are registered under ComponentType.IC but IC is not in the supported types set.