{"product_id":"3-579545mhz-3-57mhz-quartz-crystal-resonator-hc-49s-small-profile","title":"3.57MHz Quartz Crystal Resonator – HC 49S Small Crystal Oscillator","description":"\u003ch5\u003eOverview \u0026amp; Features\u003c\/h5\u003e\n\u003cp\u003eThe \u003cstrong\u003e3.579545MHz (commonly designated as 3.57MHz or 3.58MHz) Small Quartz Crystal Resonator\u003c\/strong\u003e is a high-stability, precision passive frequency-control component designed for embedded timing, telecommunications, and legacy video circuitry. Built using an AT-cut quartz blank housed within a hermetically sealed, low-profile \u003cstrong\u003eHC-49S (HC-49US)\u003c\/strong\u003e metal can, it delivers consistent, low-aging clock oscillations while occupying minimal vertical clearance on crowded PCBs.\u003c\/p\u003e\n\n\u003cp\u003eWidely recognized as the standard NTSC color burst subcarrier frequency, this 3.579545MHz crystal is an industry-standard component for dual-tone multi-frequency (DTMF) tone generation, modem decoders, radio transceivers, and microcontroller system clocks. The rugged two-pin through-hole package ensures high mechanical shock resistance, low equivalent series resistance (ESR), and dependable thermal stability across standard operating temperatures.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAlso searched as:\u003c\/strong\u003e 3.579545mhz crystal, 3.57 mhz small crystal, hc-49s 3.579mhz crystal oscillator, color burst crystal, dtmf crystal 3.58mhz, 2-pin quartz resonator.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch5\u003eTechnical Specifications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Frequency:\u003c\/strong\u003e 3.579545 MHz (3.57 MHz)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage \/ Case:\u003c\/strong\u003e HC-49S \/ HC-49US (Low-Profile Metal Casing)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e 2-Pin Through-Hole (Radial Leads)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLead Pitch:\u003c\/strong\u003e 4.88mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration \/ Cut Mode:\u003c\/strong\u003e AT-Cut Fundamental\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoad Capacitance (CL):\u003c\/strong\u003e 18pF – 20pF (Typical)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Tolerance:\u003c\/strong\u003e ±20 ppm \/ ±30 ppm (at 25°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Stability:\u003c\/strong\u003e ±30 ppm \/ ±50 ppm (-20°C to +70°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquivalent Series Resistance (ESR):\u003c\/strong\u003e ≤60Ω – 150Ω\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive Level:\u003c\/strong\u003e 100μW (500μW Max)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature Range:\u003c\/strong\u003e -20°C to +70°C\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch5\u003eCommon Applications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDTMF \u0026amp; Telecom Circuits:\u003c\/strong\u003e Providing the precise reference frequency required by dedicated DTMF generators and telephone receiver decoders (such as MT8870\/HT9170 ICs).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicrocontroller \u0026amp; Microprocessor Clocking:\u003c\/strong\u003e Supplying a steady, jitter-free external clock source for logic chips, timers, and legacy 8-bit embedded processors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalog Video \u0026amp; Television Systems:\u003c\/strong\u003e Maintaining frequency synchronization for NTSC subcarrier regeneration, video encoders, and composite signal decoders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVintage Computing \u0026amp; Retro Game Restorations:\u003c\/strong\u003e Servicing and repairing retro video game consoles, RF modulators, and legacy home computers that rely on color burst timing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch5\u003eFrequently Asked Questions\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why is 3.579545 MHz such a common crystal frequency?\u003c\/strong\u003e\u003cbr\u003e\nA: It was established as the exact color subcarrier frequency for the NTSC color television standard to avoid interference between the audio subcarrier and monochrome luminance signals. Due to mass production for televisions and radios, it became extremely inexpensive and was widely adopted for telephone DTMF tone dialers, modems, and general microcontroller clocks.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does this crystal have polarity?\u003c\/strong\u003e\u003cbr\u003e\nA: No. Quartz crystal resonators are passive, non-polarized components. You can install the two leads in either orientation on your printed circuit board or breadboard without affecting operation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What external load capacitors should I pair with this crystal?\u003c\/strong\u003e\u003cbr\u003e\nA: Standard oscillator Pierce circuits typically pair this crystal with two matching ceramic capacitors (usually 18pF to 22pF) connected from each crystal pin to ground, tailored to your microcontroller's internal inverter and trace capacitance.\u003c\/p\u003e","brand":"TOMSON ELECTRONICS","offers":[{"title":"Default Title","offer_id":49552789045486,"sku":"OSC-01997","price":5.48,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2132\/9029\/files\/3.57_MHz_SMALL_CRYSTAL.avif?v=1788870786","url":"https:\/\/www.tomsonelectronics.com\/products\/3-579545mhz-3-57mhz-quartz-crystal-resonator-hc-49s-small-profile","provider":"Tomson Electronics ","version":"1.0","type":"link"}