You can find the right 32,768 kHz clock crystal for low-power applications by ensuring that the frequency, load capacitance, ESR, package type, temperature range and start-up reliability are compatible with the actual oscillator circuit. PETERMANN-TECHNIK supports developers with suitable SMD clock crystals, a product configurator, sample availability and technical advice, based on 30 years of application experience. 32,768 kHz is the typical frequency for real-time clock circuits, RTC functions, sleep-mode timing and energy-efficient electronics. Particularly in battery-powered devices, the clock crystal must start up reliably and operate with consistently high stability over the long term.

Key selection criteria include the load capacitance for the 32.768 kHz crystal, the maximum ESR, the required frequency tolerance, the temperature range and the available PCB area. A quartz with too high an impedance can cause start-up problems in certain oscillator circuits. This is particularly the case when replacing an old SMD clock quartz in a plastic casing with a modern 32.768 kHz crystal in a ceramic casing. SMD-32.768 kHz clock crystals in plastic housings typically have a maximum ESR of 50 kiloohms. The SMD3215RR series also has a maximum ESR of just 50 kiloohms. Furthermore, a ground line must not be routed beneath a clock crystal. This disrupts the oscillation behaviour of the watch crystal.

PETERMANN-TECHNIK GmbH offers 32,768 kHz SMD clock crystals for low-power applications, smart meters, IoT, RTC, industrial electronics and automotive designs. In particular, the M3215RR in a 3.2 x 1.5 mm / 2-pad ceramic package offers a powerful combination of low-ESR design, cost-effectiveness, availability and reliability.

We help customers select not only the smallest, but also the technically best crystal oscillator for their application. This results in low-power products with extremely reliable start-up behaviour, a stable time base and high production quality.

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