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Product Detailed Parameters
- Description：XTAL OSC XO 32.7680 KHZ CMOS SMD
- Series：QTK325
- Mfr：QST
- Package：Tape & Reel (TR),Cut Tape (CT)
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：32.768 kHz
- Function：Enable/Disable
- Output：CMOS
- Voltage - Supply：3.3V
- Frequency Stability：±50ppm
- Absolute Pull Range (APR)：-
- Operating Temperature：-40°C ~ 85°C
- Spread Spectrum Bandwidth：-
- Current - Supply (Max)：3mA
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：4-SMD, No Lead
- Size / Dimension：0.126" L x 0.098" W (3.20mm x 2.50mm)
- Height - Seated (Max)：0.043" (1.10mm)
- Supplier Device Package：4-VDFN (3.2x2.5)
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Overview
The QTK325-32.768KBE-T is a standard CMOS crystal oscillator manufactured by QST, operating at a fixed frequency of 32.768 kHz. It utilizes a 4-SMD, no-lead package with dimensions of 3.2mm x 2.5mm and a height of 1.0mm. The device supports a supply voltage of 3.3V and features an enable/disable control function. Frequency stability is specified at ±50 ppm over the industrial temperature range of -40°C to +85°C. The output type is CMOS, designed for direct integration into digital circuits requiring precise timing references.
Feature Summary
- Integrated CMOS output stage compatible with standard logic levels
- Compact surface-mount package optimized for space-constrained PCB layouts
- Enable/Disable pin functionality allows for power management control
Applications
- Real-time clock (RTC) modules in consumer electronics
- Industrial communication gateways requiring stable timing
- Battery-powered IoT devices needing low-power operation
Procurement Notes
Verify that the specific part number suffix matches the required voltage and tolerance specifications. Confirm the package outline drawing aligns with the target PCB footprint. Ensure the operating temperature range meets the environmental requirements of the final assembly. Cross-reference the datasheet revision date to confirm current manufacturing status.
Selection Notes
Select this component when a 32.768 kHz reference is needed in a small form factor. The 3.3V supply requirement must match the system voltage rail. Consider the ±50 ppm stability sufficient for general-purpose timing applications. Evaluate the enable pin utility if power cycling the oscillator is necessary for energy conservation.
Part Context
This oscillator belongs to the QTK325 series from QST, which focuses on compact quartz-based timing solutions. The series offers various frequencies and packages, but this specific model targets the common 32.768 kHz application. It serves as a drop-in replacement for discrete crystal resonators where external load capacitors are undesirable.
Replacement Considerations
Direct substitutes include other 32.768 kHz CMOS oscillators in 3225 packages with similar electrical characteristics. Verify pin compatibility and voltage levels before swapping. Alternative models may offer different stability grades or temperature ranges.
