RT3215-32.768-7-TR Quartz Resonator: A Key Component for Stable RTC Clocks and IoT Applications

The RT3215-32.768-7-TR quartz resonator from Raltron is widely used in circuits requiring precise timekeeping. Its specifications make it an excellent choice for applications such as watches, RTC modules, or IoT devices.

1. Basic Information:

• Manufacturer: Raltron
• Model: RT3215-32.768-7-TR
• Resonator Type: Quartz
• Nominal Frequency: 32.768 kHz — the standard frequency for watch resonators, allowing for easy signal division in digital circuits (e.g., in digital watches, it is responsible for counting one second).
• Package: SMD 3215 (surface-mount), with dimensions of 3.2 mm × 1.5 mm.
• Packaging Type: TR (tape & reel), suitable for automated SMT (Surface Mount Technology) assembly.

2. Electrical Characteristics:

• Frequency Tolerance (at 25°C): ±20 ppm (parts per million), corresponding to a deviation of approximately 0.0002% — a key parameter indicating the resonator's precision.
• Load Capacitance (CL): 7 pF — specifies the capacitance the resonator must work with in an oscillator circuit to achieve its nominal frequency.
• Equivalent Series Resistance (ESR): Up to 70 kΩ — ESR impacts the stability of the oscillator and energy consumption in low-power systems.
• Operating Temperature Range: -40°C to +85°C — allows operation in a wide range of environmental conditions, making the resonator suitable for industrial and consumer applications.

3. Advantages of the RT3215-32.768-7-TR Resonator:

• Compact Size: Its small dimensions make it easy to integrate even in miniature devices.
• Low Power Consumption: Resonators with a frequency of 32.768 kHz are characterized by very low energy usage, which is crucial in battery-powered applications (e.g., IoT devices).
• Temperature Stability: Due to the use of high-quality quartz, this resonator exhibits excellent stability across a wide temperature range, minimizing frequency drift.
• Standards Compliance: It meets industrial standards, making it suitable for a broad range of devices, including medical, automotive, and telecommunications equipment.

4. Applications in RTC (Real-Time Clock) Circuits:

Quartz resonators with a frequency of 32.768 kHz are commonly used in RTC modules that provide precise clock signals for microprocessors. Examples of such applications include:

• Digital and Analog Watches: Ensure accurate second counting and synchronization.
• Microcontrollers: RTC modules use the 32.768 kHz signal to maintain accurate time even during battery-powered operation (in sleep mode).
• Medical Devices and IoT: Thanks to low power requirements, this resonator can be employed in battery-operated devices like glucose meters or fitness trackers.

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