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XK

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Product Longevity: 2040

55fs Small Package Quartz-based PLL Oscillator

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Features

  • Phase jitter (12kHz to 20MHz): 55fs RMS (typ.) at 156.25MHz
  • Package options:
    • 1.8 × 1.4 × 0.85 mm (1.6 × 1.2 mm footprint compatible)
    • 2.0 × 1.6 × 0.85 mm
    • 2.5 × 2.0 × 0.7 mm
    • 3.2 × 2.5 × 0.7 mm
  • Factory programmable with up to three frequencies (from 50MHz to 1250MHz) and/or output types
  • Output types: LVCMOS, LVDS, HCSL, LVPECL, CML
  • Supply voltage: 1.8V, 2.5V or 3.3V
  • Total stability (including temperature, power supply, and aging):
    • ± 50ppm (2.5V, 3.3V)
  • Operating temperatures: -40°C to +85°C
Find Other Products in Crystal Oscillators
XK - Pin Assignment
XK - Pin Assignment

Description

The XK devices are a second-generation follow-on to the XF ProXO high-performance oscillators designed for high-performance applications and are often referred to as ProXO II. The XK family is optimized for communications applications requiring ultra-low jitter and is available in the industry’s smallest package. Each device can be factory programmed with up to 3 frequencies and/or output types.

The differential oscillator supports 20 commonly used networking frequencies from 50MHz to 1250MHz. It features 55fs RMS jitter (typ.), excellent immunity to power supply noise and environmental hazards, industry-standard package sizes down to 1.8 x 1.4 mm and operating temperature support from -40°C to 85°C.

This device is factory-configurable.
Try the Custom Part Configuration Utility.

Parameters

AttributesValue
FunctionXO
Output TypeHCSL, LVCMOS, LVDS
Output Freq Range (MHz)50 - 1250
Supply Voltage (V)1.8 - 1.8, 3.3 - 3.3
Phase Jitter Max RMS (ps)0.055
Freq. Stability Total (± PPM)30, 50
Temp. Range (°C)-40 to 85°C
Product CategoryCrystal Oscillators

Package Options

Pkg. TypePkg. Dimensions (mm)Lead Count (#)Pitch (mm)
LGA1.4 x 1.8 x 0.8560.55
LGA2.0 x 1.6 x 0.8560.73
LGA2.0 x 2.5 x 0.760.9
LGA3.2 x 2.5 x 0.761.06
This device is factory-configurable.
Try the Custom Part Configuration Utility.
Part NumberStatusSamplesLongevityStockPackageLead Count (#)Carrier TypeMoisture Sensitivity Level (MSL)Output Freq (MHz)Pitch (mm)Pkg. Dimensions (mm)Output TypeFreq. Stability Total (± PPM)Supply Voltage (V)Pb (Lead) FreePb Free CategoryTemp. Range (°C)
XK01H050H100H125IActiveAvailable2040 AprIn StockLGA6#Cut Tape350MHz, 100MHz, 125MHz0.55mm1.4 x 1.8 x 0.85LVCMOS30± PPM1.8 - 1.8Yese3 Sn-40 to 85°C
XK03L106L212L425IActiveAvailable2040 AprIn StockLGA6#Cut Tape3106.25MHz, 212.5MHz, 425MHz0.55mm1.4 x 1.8 x 0.85LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK03L156L312L625IActiveAvailable2040 AprOut of StockLGA6#Cut Tape3156.25MHz, 312.5MHz, 625MHz0.55mm1.4 x 1.8 x 0.85LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK03L161L322L644IActiveAvailable2040 AprIn StockLGA6#Cut Tape3161.132813MHz, 322.265625MHz, 644.53125MHz0.55mm1.4 x 1.8 x 0.85LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK03R156R312R625IActiveAvailable2040 AprIn StockLGA6#Cut Tape3156.25MHz, 312.5MHz, 625MHz0.55mm1.4 x 1.8 x 0.85HCSL50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK11H050H100H125IActiveAvailable2040 AprIn StockLGA6#Cut Tape350MHz, 100MHz, 125MHz0.73mm2.0 x 1.6 x 0.85LVCMOS30± PPM1.8 - 1.8Yese3 Sn-40 to 85°C
XK13L106L212L425IActiveAvailable2040 AprIn StockLGA6#Cut Tape3106.25MHz, 212.5MHz, 425MHz0.73mm2.0 x 1.6 x 0.85LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK13L156L312L625IActiveAvailable2040 AprIn StockLGA6#Cut Tape3156.25MHz, 312.5MHz, 625MHz0.73mm2.0 x 1.6 x 0.85LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK13L161L322L644IActiveAvailable2040 AprIn StockLGA6#Cut Tape3161.132813MHz, 322.265625MHz, 644.53125MHz0.73mm2.0 x 1.6 x 0.85LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK13R156R312R625IActiveAvailable2040 AprIn StockLGA6#Cut Tape3156.25MHz, 312.5MHz, 625MHz0.73mm2.0 x 1.6 x 0.85HCSL50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK21H050H100H125IActiveAvailable2040 AprIn StockLGA6#Cut Tape350MHz, 100MHz, 125MHz0.9mm2.0 x 2.5 x 0.7LVCMOS30± PPM1.8 - 1.8Yese3 Sn-40 to 85°C
XK23L106L212L425IActiveAvailable2040 AprIn StockLGA6#Cut Tape3106.25MHz, 212.5MHz, 425MHz0.9mm2.0 x 2.5 x 0.7LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK23L156L312L625IActiveAvailable2040 AprIn StockLGA6#Cut Tape3156.25MHz, 312.5MHz, 625MHz0.9mm2.0 x 2.5 x 0.7LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK23L161L322L644IActiveAvailable2040 AprIn StockLGA6#Cut Tape3161.132813MHz, 322.265625MHz, 644.53125MHz0.9mm2.0 x 2.5 x 0.7LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK23R156R312R625IActiveAvailable2040 AprIn StockLGA6#Cut Tape3156.25MHz, 312.5MHz, 625MHz0.9mm2.0 x 2.5 x 0.7HCSL50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK31H050H100H125IActiveAvailable2040 AprIn StockLGA6#Cut Tape350MHz, 100MHz, 125MHz1.06mm3.2 x 2.5 x 0.7LVCMOS30± PPM1.8 - 1.8Yese3 Sn-40 to 85°C
XK33L106L212L425IActiveAvailable2040 AprIn StockLGA6#Cut Tape3106.25MHz, 212.5MHz, 425MHz1.06mm3.2 x 2.5 x 0.7LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK33L156L312L625IActiveAvailable2040 AprIn StockLGA6#Cut Tape3156.25MHz, 312.5MHz, 625MHz1.06mm3.2 x 2.5 x 0.7LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK33L161L322L644IActiveAvailable2040 AprIn StockLGA6#Cut Tape3161.132813MHz, 322.265625MHz, 644.53125MHz1.06mm3.2 x 2.5 x 0.7LVDS50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
XK33R156R312R625IActiveAvailable2040 AprOut of StockLGA6#Cut Tape3156.25MHz, 312.5MHz, 625MHz1.06mm3.2 x 2.5 x 0.7HCSL50± PPM3.3 - 3.3Yese3 Sn-40 to 85°C
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    Recommended Documents (1)

  1. Datasheet
    XK Datasheet
    RECOMMENDED
    PDF 1.13 MB R31DS0145EU0116 Rev.1.16 Sep 25, 2025

    Datasheets (13)

  1. Datasheet
    XK Datasheet
    RECOMMENDED
    PDF 1.13 MB R31DS0145EU0116 Rev.1.16 Sep 25, 2025
  2. Datasheet Addendum
    XK23L156L312L625I Datasheet Addendum
    PDF 139 KB R31DS0198EU0100 Rev.1.00 Nov 06, 2023
  3. Datasheet Addendum
    XK33L156L312L625I Datasheet Addendum
    PDF 138 KB R31DS0195EU0100 Rev.1.00 Nov 06, 2023
  4. Datasheet Addendum
    XK23R156R312R625I Datasheet Addendum
    PDF 139 KB R31DS0196EU0100 Rev.1.00 Nov 06, 2023
  5. Datasheet Addendum
    XK23L161L322L644I Datasheet Addendum
    PDF 137 KB R31DS0197EU0100 Rev.1.00 Nov 06, 2023
    6. View More (13)

    Application Notes & White Papers (1)

  1. Application Note
    Layout Recommendations for Optimal Thermal Dissipation in ProXO II
    PDF 158 KB R31AN0057EU0100 Rev.1.00 Jul 25, 2023
    AI-generated Summary: Layout recommendations focus on optimizing thermal dissipation for ProXO II devices by managing junction temperature through proper PCB design and operating conditions. Key techniques include using thermal vias connected to ground and power planes, placing devices centrally away from PCB edges and high-power components, employing wider and thicker solder traces, and using thicker PCBs to enhance heat spread. Power supply design emphasizes quiet, well-regulated sources with close bypass capacitors. Clamshell test sockets require caution due to limited thermal dissipation. Reference layouts specify copper plane areas and via configurations to maintain device junction temperatures within safe limits.
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Simulation Models

    Simulation Models (1)

  1. Model - IBIS
    XK IBIS Model
    ZIP 104 KB rs-proxoii_IBIS Mar 17, 2025
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Learn about how the ProXO2 family delivers the industry’s smallest package and uncompromised performance at 55fs typical phase jitter.

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Knowledge Base

  1. What is the flammability rating for your Crystal Oscillators?

    Last Updated: 01/13/2026 Question: What is the flammability rating for your Crystal Oscillators? Answer: All these are hermetic packages. There is no classification for hermetic packages as they are non-flammable components. Suitable Products (XO): XK, XF, XT, XU, XL and XA

    Jan 13, 2026
  2. Crystal Oscillator Radiation Testing

    ... Question: Do you have radiation test reports for your crystal oscillators? Answer: As these are commercially rated devices, these do not undergo radiation qualifications and we cannot recommend them for use in space applications or other radiation environments.   Suitable Products Crystal Oscillator Series XA, XF, XK, XL, XP, XT, XU

    Mar 31, 2026
  3. Can the Clock Oscillators, Quartz Crystal Oscillators be washed in the PCB assembly process.

    Yes, all these family devices [ (XO): XK, XF, XT, XU, XL & XA ] are sealed and can go through the washing process.

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