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iqd

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

personAuthor: jakexiaohubgithub
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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:

| Code | Package Size | Common Use | |------|--------------|------------| | 016 | 1.6 x 1.2mm | Ultra-small SMD | | 020 | 2.0 x 1.6mm | Small SMD | | 025 | 2.5 x 2.0mm | Standard SMD | | 032 | 3.2 x 2.5mm | Standard SMD (most common) | | 050 | 5.0 x 3.2mm | Larger SMD | | 070 | 7.0 x 5.0mm | Large SMD |

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

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

| Code | Package Size | Common Use | |------|--------------|------------| | 21 | 2.0 x 1.6mm | Ultra-compact oscillators | | 25 | 2.5 x 2.0mm | Compact oscillators | | 32 | 3.2 x 2.5mm | Standard oscillators | | 50 | 5.0 x 3.2mm | Standard/high stability | | 70 | 7.0 x 5.0mm | High stability / OCXO | | 90 | 9.0 x 7.0mm | High stability OCXO |

Component Type Prefixes

Crystal Prefixes

| Prefix | Component Type | Description | |--------|----------------|-------------| | LFXTAL | Low Frequency Crystal | 32.768 kHz and other low frequencies | | CFPX | Standard Crystal | General purpose SMD crystals | | XTALS | SMD Crystal | Surface mount crystal units | | XTAL | Through-hole Crystal | Leaded crystal units (HC-49, etc.) |

Oscillator Prefixes

| Prefix | Component Type | Description | |--------|----------------|-------------| | IQXO | Standard Oscillator | Basic clock oscillator (XO) | | IQXO-H | High Frequency Oscillator | Higher frequency range XO | | IQXO-L | Low Power Oscillator | Reduced power consumption XO | | IQTX | TCXO | Temperature Compensated Crystal Oscillator | | IQTX-H | High Stability TCXO | Tighter frequency stability | | IQTX-L | Low Power TCXO | Reduced power consumption | | IQVCXO | VCXO | Voltage Controlled Crystal Oscillator | | IQVCXO-H | High Stability VCXO | Tighter frequency stability | | IQOCXO | OCXO | Oven Controlled Crystal Oscillator | | IQOCXO-H | High Stability OCXO | Ultra-stable (PPB range) |

Module and Filter Prefixes

| Prefix | Component Type | Description | |--------|----------------|-------------| | IQCM | Clock Module | Integrated clock/timing module | | IQRTC | RTC Module | Real-Time Clock module | | IQXF | Crystal Filter | Crystal-based bandpass filter | | IQSPF | SAW Filter | Surface Acoustic Wave filter | | IQRB | Resonator Bandpass | Resonator-based bandpass filter |

Supported Component Types

The IQDHandler supports these component types:

| ComponentType | Description | |---------------|-------------| | CRYSTAL | Base crystal type | | CRYSTAL_IQD | IQD-specific crystal | | OSCILLATOR | Base oscillator type | | OSCILLATOR_IQD | IQD standard oscillator | | OSCILLATOR_TCXO_IQD | IQD TCXO | | OSCILLATOR_VCXO_IQD | IQD VCXO | | OSCILLATOR_OCXO_IQD | IQD OCXO | | CRYSTAL_FILTER_IQD | IQD crystal filter | | RTC_MODULE_IQD | IQD RTC module |

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:

| Grade | Typical PPM | Application | |-------|-------------|-------------| | Standard | +/- 20-100 | General purpose | | Medium | +/- 2.5-10 | Precision timing | | High | +/- 0.5-2.5 | High accuracy | | Ultra | +/- 0.1-0.5 | Precision instruments | | OCXO | PPB range | Ultra-stable references |

Common Frequency Values

Standard Crystal Frequencies

| Frequency | Common Application | |-----------|-------------------| | 32.768 kHz | RTC, watch crystals | | 4.000 MHz | General purpose | | 8.000 MHz | Microcontrollers | | 12.000 MHz | USB (12 Mbps) | | 16.000 MHz | Microcontrollers | | 20.000 MHz | General purpose | | 25.000 MHz | Ethernet PHY | | 48.000 MHz | USB (480 Mbps) |

Standard Oscillator Frequencies

| Frequency | Common Application | |-----------|-------------------| | 1.000 MHz | Low frequency reference | | 10.000 MHz | Reference standard | | 12.288 MHz | Audio (48 kHz * 256) | | 19.200 MHz | Telecom reference | | 24.576 MHz | Audio (96 kHz * 256) | | 100.000 MHz | High-speed systems |

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.
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