NDK (Nihon Dempa Kogyo) Manufacturer Skill

Manufacturer Overview

NDK (Nihon Dempa Kogyo Co., Ltd.) is a leading Japanese manufacturer of timing devices and frequency control products including:

• Crystal Units: Standard crystals (NX), tuning fork crystals (NT), high frequency crystals (NH), automotive grade (NAT)
• Clock Oscillators: Standard oscillators (NZ), programmable oscillators (NP), low jitter oscillators (NV)
• TCXOs: Temperature Compensated Crystal Oscillators (NT, NTW)
• VCXOs: Voltage Controlled Crystal Oscillators (NV, NVW)
• OCXOs: Oven Controlled Crystal Oscillators (NO, NH)
• VCSOs: Voltage Controlled SAW Oscillators (VS, VSW)
• SAW Devices: SAW filters (SF), SAW resonators (SR), SAW duplexers (SD)

NDK is known for high-precision timing components used in telecommunications, networking, automotive, and industrial applications.

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MPN Structure

NDK MPNs follow this general structure:

[PREFIX][SIZE][VARIANT]-[FREQUENCY][OPTIONS]
   |       |      |          |         |
   |       |      |          |         +-- Temperature grade, packaging
   |       |      |          +-- Frequency code (MHz or kHz)
   |       |      +-- Variant/specification letter
   |       +-- Size code (2 digits indicating package dimensions)
   +-- Product family prefix (NX, NT, NZ, NV, etc.)

Family Prefixes

| Prefix | Product Type | Description | |--------|--------------|-------------| | NX | Standard Crystal | AT-cut MHz range crystals | | NT | Tuning Fork Crystal / TCXO | 32.768 kHz crystals or TCXOs | | NH | High Frequency Crystal | High frequency AT-cut crystals | | NAT | Automotive Crystal | AEC-Q200 qualified crystals | | NZ | Standard Oscillator | SPXO (Simple Packaged Crystal Oscillator) | | NP | Programmable Oscillator | User-programmable frequency | | NV | VCXO / Low Jitter | Voltage controlled or low jitter oscillators | | NTW | Wide Temp TCXO | Extended temperature range TCXO | | NVW | Wide Pull VCXO | Extended pull range VCXO | | NO | OCXO | Oven Controlled Crystal Oscillator | | VS | VCSO | Voltage Controlled SAW Oscillator | | VSW | Wide Pull VCSO | Extended pull range VCSO | | SF | SAW Filter | Surface Acoustic Wave filter | | SR | SAW Resonator | Surface Acoustic Wave resonator | | SD | SAW Duplexer | Surface Acoustic Wave duplexer |

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Example MPN Decoding

Crystal Example

NX3225SA-24.000M
|  |  | |     |
|  |  | |     +-- 24.000M = 24 MHz frequency
|  |  | +-- - = Separator
|  |  +-- SA = Series/specification variant
|  +-- 32 25 = 3.2 x 2.5mm package
+-- NX = Standard Crystal family

Oscillator Example

NZ2520SDA-20.000M
|  |  |  |     |
|  |  |  |     +-- 20.000M = 20 MHz frequency
|  |  |  +-- - = Separator
|  |  +-- SDA = Series/specification variant
|  +-- 25 20 = 2.5 x 2.0mm package (note: size code is first 2 digits after prefix)
+-- NZ = Standard Oscillator family

Automotive Crystal Example

NAT3225SBTC-25.000M
|   |   |     |
|   |   |     +-- 25.000M = 25 MHz frequency
|   |   +-- SBTC = Automotive specification variant
|   +-- 32 25 = 3.2 x 2.5mm package
+-- NAT = Automotive grade Crystal

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Supported Component Types

The NDKHandler supports these ComponentTypes:

| ComponentType | Description | Example Prefixes | |---------------|-------------|------------------| | CRYSTAL | Generic crystal type | NX, NT, NH, NAT | | CRYSTAL_NDK | NDK-specific crystal | NX, NT, NH, NAT | | OSCILLATOR | Generic oscillator type | NZ, NP, NV, NT, NTW, NVW, NO, NH, VS, VSW | | OSCILLATOR_NDK | NDK-specific oscillator | NZ, NP, NV | | OSCILLATOR_TCXO_NDK | Temperature compensated | NT, NTW | | OSCILLATOR_VCXO_NDK | Voltage controlled | NV, NVW | | OSCILLATOR_OCXO_NDK | Oven controlled | NO, NH | | SAW_FILTER_NDK | SAW filter devices | SF | | SAW_RESONATOR_NDK | SAW resonator devices | SR |

Note: SAW devices (SF, SR, SD) are registered under ComponentType.IC in patterns but SAW_FILTER_NDK and SAW_RESONATOR_NDK are listed in getSupportedTypes().

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Package Code Extraction

The handler extracts package dimensions from the size code in the MPN. The size code is positions 3-4 (0-indexed) after the prefix.

Crystal Packages (NX, NT, NH, NAT)

| Size Code | Package Dimensions | |-----------|-------------------| | 12 | 1.2 x 1.0mm | | 16 | 1.6 x 1.2mm | | 20 | 2.0 x 1.6mm | | 25 | 2.5 x 2.0mm | | 32 | 3.2 x 2.5mm | | 50 | 5.0 x 3.2mm | | 80 | 8.0 x 4.5mm |

Extraction Logic:

// For crystals: extract characters at positions 3-4 (after NX, NT, NH, or NAT prefix)
// Example: NX3225SA → position 3 is "3", position 4 is "2" → "32" → 3.2 x 2.5mm
String sizeCode = upperMpn.substring(3, 5);  // Gets "32" from "NX3225..."

Oscillator Packages (NZ, NP, NV, NO)

| Size Code | Package Dimensions | |-----------|-------------------| | 21 | 2.0 x 1.6mm | | 25 | 2.5 x 2.0mm | | 32 | 3.2 x 2.5mm | | 50 | 5.0 x 3.2mm | | 70 | 7.0 x 5.0mm | | 98 | 9.8 x 7.5mm |

Extraction Logic:

// For oscillators: extract characters at positions 3-4
// Example: NZ2520SDA → "25" → 2.5 x 2.0mm
String sizeCode = upperMpn.substring(3, 5);

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Series Extraction

The handler returns descriptive series names based on the MPN prefix:

Crystal Series

| Prefix | Series Name | |--------|-------------| | NX | Standard Crystal | | NT | Tuning Fork Crystal | | NH | High Frequency Crystal | | NAT | Automotive Crystal |

Oscillator Series

| Prefix | Variant Check | Series Name | |--------|---------------|-------------| | NZ | - | Standard Oscillator | | NP | - | Programmable Oscillator | | NV | char[2] == 'W' | Wide Pull VCXO | | NV | (other) | VCXO | | NT | char[2] == 'W' | Wide Temp TCXO | | NT | (other) | TCXO | | NO | - | OCXO | | NH | (not crystal pattern) | High Stability OCXO |

VCSO Series

| Prefix | Series Name | |--------|-------------| | VS | VCSO | | VSW | Wide Pull VCSO |

SAW Device Series

| Prefix | Series Name | |--------|-------------| | SF | SAW Filter | | SR | SAW Resonator | | SD | SAW Duplexer |

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Frequency Code Patterns

NDK MPNs include frequency specifications after the hyphen:

| Format | Meaning | Example | |--------|---------|---------| | XX.XXXM | Megahertz | 24.000M, 48.000M | | XX.XXXXM | Megahertz (4 decimal) | 24.0000M | | 32.768K | 32.768 kHz | Tuning fork crystal frequency |

Extraction Logic:

private String extractFrequencyCode(String mpn) {
    // Extract everything after the last hyphen
    int lastDash = mpn.lastIndexOf('-');
    if (lastDash >= 0 && lastDash < mpn.length() - 1) {
        return mpn.substring(lastDash + 1);
    }
    return "";
}

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Common Example MPNs

Standard Crystals (NX)

| MPN | Type | Size | Frequency | |-----|------|------|-----------| | NX3225SA-24.000M | Standard | 3.2 x 2.5mm | 24 MHz | | NX2520SA-16.000M | Standard | 2.5 x 2.0mm | 16 MHz | | NX2016SA-32.000M | Standard | 2.0 x 1.6mm | 32 MHz | | NX5032GA-8.000M | Standard | 5.0 x 3.2mm | 8 MHz |

Tuning Fork Crystals (NT)

| MPN | Type | Size | Frequency | |-----|------|------|-----------| | NT2012SA-32.768K | Tuning Fork | 2.0 x 1.2mm | 32.768 kHz | | NT1612SA-32.768K | Tuning Fork | 1.6 x 1.2mm | 32.768 kHz |

Automotive Crystals (NAT)

| MPN | Type | Size | Frequency | |-----|------|------|-----------| | NAT3225SBTC-25.000M | Automotive | 3.2 x 2.5mm | 25 MHz | | NAT2520SBTA-20.000M | Automotive | 2.5 x 2.0mm | 20 MHz |

Standard Oscillators (NZ)

| MPN | Type | Size | Frequency | |-----|------|------|-----------| | NZ2520SDA-20.000M | Standard | 2.5 x 2.0mm | 20 MHz | | NZ3225SDA-24.000M | Standard | 3.2 x 2.5mm | 24 MHz | | NZ5032SDA-50.000M | Standard | 5.0 x 3.2mm | 50 MHz |

TCXOs (NT oscillator)

| MPN | Type | Size | Stability | |-----|------|------|-----------| | NT2520SD-26.000M | TCXO | 2.5 x 2.0mm | Standard | | NTW3225CC-26.000M | Wide Temp TCXO | 3.2 x 2.5mm | Extended temp |

VCXOs (NV)

| MPN | Type | Size | Pull Range | |-----|------|------|------------| | NV2520SA-100.000M | VCXO | 2.5 x 2.0mm | Standard | | NVW3225SD-155.520M | Wide Pull VCXO | 3.2 x 2.5mm | Extended |

OCXOs (NO)

| MPN | Type | Size | Stability | |-----|------|------|-----------| | NO5032SD-10.000M | OCXO | 5.0 x 3.2mm | High | | NO7050SD-10.000M | OCXO | 7.0 x 5.0mm | Very High |

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Handler Implementation Notes

Pattern Registration

The handler registers patterns for both base types and NDK-specific types:

// Crystal patterns - register for BOTH generic and manufacturer-specific types
registry.addPattern(ComponentType.CRYSTAL, "^NX[0-9].*");
registry.addPattern(ComponentType.CRYSTAL_NDK, "^NX[0-9].*");

Prefix Overlap Issues

NT Prefix Conflict: The NT prefix is used for BOTH:

• Tuning fork crystals (when followed by size code like NT1612, NT2012)
• TCXOs (Temperature Compensated Crystal Oscillators)

The handler's extractSeries() method has overlapping checks:

// This check comes first, returning "Tuning Fork Crystal"
if (upperMpn.startsWith("NT")) return "Tuning Fork Crystal";

// This check is never reached because the first one matches
if (upperMpn.startsWith("NT") && upperMpn.length() > 3) {
    // TCXO logic
}

NH Prefix Conflict: The NH prefix is used for BOTH:

• High frequency crystals
• High stability OCXOs

Replacement Compatibility

The isOfficialReplacement() method checks:

1. Series compatibility - Same series or compatible upgrade path
2. Package match - Same physical dimensions required
3. Frequency match - Identical frequency code required

// Compatible series: Wide temp/stability can replace standard
if (series1.startsWith("Wide Temp") &&
    series2.equals(series1.replace("Wide Temp ", ""))) return true;
if (series1.startsWith("High Stability") &&
    series2.equals(series1.replace("High Stability ", ""))) return true;

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Related Files

• Handler: manufacturers/NDKHandler.java
• Component types: CRYSTAL, CRYSTAL_NDK, OSCILLATOR, OSCILLATOR_NDK, OSCILLATOR_TCXO_NDK, OSCILLATOR_VCXO_NDK, OSCILLATOR_OCXO_NDK, SAW_FILTER_NDK, SAW_RESONATOR_NDK

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Learnings & Quirks

Handler Issues (Identified)

• HashSet in getSupportedTypes(): Uses mutable HashSet, should use Set.of() for immutability (see CLAUDE.md "Handlers Without Tests" section)
• Missing IC type in getSupportedTypes(): SAW devices (SF, SR, SD) register patterns under ComponentType.IC but IC is not in getSupportedTypes()
• NT prefix ambiguity: Same prefix used for tuning fork crystals AND TCXOs; series extraction logic has unreachable code
• NH prefix ambiguity: Same prefix used for high frequency crystals AND high stability OCXOs
• Package extraction position: Uses fixed positions 3-4 which assumes 2-letter prefix; NAT (3-letter) will extract wrong characters ("T3" from "NAT3225...")

Size Code Mapping

NDK uses a unique size code system where digits represent dimensions:

• First digit = first dimension (mm), second digit = second dimension
• "32" = 3.2mm x 2.5mm (but "25" in oscillators = 2.5mm x 2.0mm)
• The mapping is not always intuitive; always verify against datasheet

Oscillator Type Hierarchy

| Type | Stability | Temperature Range | Use Case | |------|-----------|-------------------|----------| | SPXO (NZ) | ±25-50 ppm | -20 to +70°C | General timing | | TCXO (NT) | ±0.5-2 ppm | -30 to +85°C | Cellular, GPS, IoT | | VCXO (NV) | ±25-50 ppm | -20 to +70°C | PLL, clock recovery | | OCXO (NO) | ±0.01-0.1 ppm | -40 to +85°C | Telecom, instrumentation |

SAW Device Applications

| Type | Application | |------|-------------| | SF (Filter) | RF filtering in mobile phones, base stations | | SR (Resonator) | Timing reference for RF circuits | | SD (Duplexer) | Simultaneous TX/RX in wireless devices |

Competing Products

| NDK | Epson | TXC | Kyocera/AVX | Murata | |-----|-------|-----|-------------|--------| | NX series | FA series | 7A series | KC series | - | | NZ series | SG series | 8Z series | KT series | - | | NT (TCXO) | TG series | 8P series | - | - | | SF/SR/SD | - | - | - | SAW devices |

Temperature Grade Suffixes

Common temperature grade indicators in NDK MPNs:

• No suffix: Commercial (0°C to +70°C)
• T or TC: Industrial (-40°C to +85°C)
• A or AC: Automotive (-40°C to +125°C)

Packaging/Tape Options

| Suffix | Meaning | |--------|---------| | -K or K3 | Tape and reel packaging | | (no suffix) | Tray packaging |

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