If you are looking for a reliable and inexpensive 32.768 kHz crystal, then our M3215RR in a 3.2x1.5mm/2pad ceramic housing is the ideal choice. The M3215RR is the cheapest SMD clock crystal ever and is characterised by optimum availability, durability and economy in equal measure.
The SMD watch crystals in the M3215RR series are also equipped with our innovative and patented LRT resonators (Low ESR Resonator Technology). With a maximum resistance of just 50 kΩ, they impress with excellent transient behaviour in every 32,768 kHz oscillator stage, reliable data retention over the entire service life, outstanding reliability and longevity, which are of long-term benefit to you and optimally support your product performance.
Every single crystal is 100 % tested so that you can rely on consistent quality, a long service life and dependable technical support.
Thanks to our own mould design (housing), we can offer the M3215RR crystals at particularly favourable prices.
Why do without smaller designs?
Even smaller 32,768 kHz crystals (e.g. 2.0 x 1.2 mm or 1.6 x 1.2 mm) are often used in the miniaturisation of PCBs. However, these models usually have significantly higher ESR values (up to 90 kΩ) and are much more expensive than the M3215RR. The higher resistance of these miniaturised 32,768 kHz crystals can lead to oscillation problems with many 32,768 kHz oscillator stages (not only at +25°C, but also in particular over the specified operating temperature range) - and at higher product prices.
We therefore recommend sticking with the tried and tested 3.2 x 1.5 mm/2-pad ceramic housing. This offers the ideal balance of compact design, electrical stability and economic efficiency - even for demanding automotive applications, for which M3215RR variants are also available.
Technical options and availability
The M3215RR 32.768 kHz crystals are available with different load capacities (4 pF, 6 pF, 7 pF, 9 pF and 12.5 pF) - generally available directly from stock.
Recommendation for the development engineer
Many development engineers have to design small circuit boards/applications. It is much more favourable to use the M3215RR in combination with a very small MHz crystal in a 1.6x1.2mm/4pad ceramic package than a small 32.768kHz crystal (e.g. in a 2.0x1.2mm or 1.6x1.0mm ceramic package) in combination with a larger MHz SMD crystal. Ask our specialists, who can give you the best advice based on their many years of experience.
The after-sales guarantee for both quartz versions is >20 years! This means that both SMD oscillating quartz versions can be used safely in long-running applications.
Your advantages at a glance
✅ Extremely favourable 32,768 kHz SMD clock crystal
✅ Low ESR design for stable oscillation under all conditions
✅ 100% quality testing & long service life
✅ Ideal for industrial and automotive applications
✅ Available immediately from stock
Links:
Product configurator SMD01612/4
