Product Overview
24 MHz Quartz Crystal in a Low-Profile HC-49/S Metal Can, Two Wire Leads, New Unused Stock
Condition
New and unused. The photographed piece is representative of the shelf stock: the plated metal can is bright and unmarked by handling, the seam is clean, and the two wire leads come off the base straight and bright with no solder and no kinks. The lead ends read as cut flat, and at this resolution the plating finish on the leads is not established one way or the other. The photo is a side-on view, so the flat face of the can is turned away from the camera and any printed marking on it is not visible here. No packaging is shown, so nothing is claimed about how the piece is stored.
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Product Overview
This is a 24 MHz quartz crystal in the HC-49/S package - the low-profile thru-hole metal can with two wire leads that has been the default clock element on hobby and production boards for decades. It is a passive resonator, not a powered oscillator module: it sets the frequency, and the gain stage and load capacitors on your board do the rest. The listing carries this part under the number 24.000816, which is the number to match if you are reordering against an existing build. 24 MHz is a workhorse timebase - a common bus and peripheral clock in microcontroller and USB designs - and the HC-49/S footprint is the one most through-hole boards are already laid out for. Load capacitance, frequency tolerance, temperature stability and drive level are not confirmed here; check them against the datasheet for your design before you commit a board to it.
Key Features
- Nominal frequency: 24 MHz
- Package: HC-49/S low-profile metal can, thru-hole mount
- Terminations: two wire leads, straight and bright in the photo, free of solder - lead plating finish not established at this resolution
- Part number carried on this listing: 24.000816
- Type: passive quartz crystal resonator - it needs an oscillator circuit and load capacitors, it is not a powered four-pin oscillator can
- Condition: New, unused, no solder and no installation marks
- Load capacitance, tolerance, stability and drive level: not confirmed - verify against your datasheet before use
- Stock on hand: 26 pieces, sold in the exact count you need
Applications
- Firmware developer clocking a microcontroller board at 24 MHz and wanting a through-hole part they can socket, swap and measure on the bench
- Repair technician replacing a cracked or dead crystal on a legacy board that was laid out for an HC-49/S footprint
- Kit builder or student stuffing a prototype board by hand, where a two-lead metal can is far easier to place than a surface-mount resonator
- Bench experimenter building a test oscillator or divider chain and needing a known nominal 24 MHz starting point
Frequently Asked Questions
Is this a crystal or a crystal oscillator module?
It is a crystal. The photo shows the two-lead HC-49/S can of a passive quartz resonator, not the four-pin powered oscillator package that the phrase crystal oscillator usually means. Our older listing text used the looser wording, and we have corrected it here so nobody orders the wrong thing. You supply the oscillator circuit and the load capacitors; this part supplies the frequency.
What load capacitance does it want?
Not confirmed. Nothing in our records or in the photo establishes the load capacitance, tolerance, stability or drive level, and guessing at those is how a timebase ends up a few hundred parts per million off. Check the datasheet for this part number and match your load caps to it before you commit a board.
Is the frequency bench-verified on each piece?
No. These are sold as new unused stock at the nominal 24 MHz on the listing, not as individually measured parts. If your application is frequency-critical - a serial link, a USB clock, anything where the tolerance budget is tight - measure the piece in your own circuit before the board is final.
Will it drop into an existing HC-49/S footprint?
It is the standard low-profile HC-49/S can with two wire leads, which is what those footprints are cut for. We have not measured the lead spacing against the photo, so if your board is tight or the original part was a taller HC-49U, compare against your layout before you order a stack of them.
Why buy four of these here instead of a bag of a hundred somewhere else?
Because a board usually needs one crystal, and a spares drawer needs two or three. We have 26 on the shelf and you pick the number, so you are not carrying 96 crystals you will never place to get the four you actually need. Shipping is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day, so a small handful of parts stays a small purchase.
A quartz crystal has exactly one job and no opinions about it: hold the beat while everything else on the board argues. Give this HC-49/S its load caps and a short, clean layout, and your 24 MHz timebase stops being the part of the design you think about.
