QTV750-38.880MBB-T

Overview

The QTV750-38.880MBB-T is a Voltage Controlled Crystal Oscillator (VCXO) manufactured by QST Products, LLC. It operates at a nominal frequency of 38.880 MHz with CMOS output signal levels. The device supports a supply voltage of 3.3 VDC and features an Absolute Pull Range (APR) of ±50 ppm. Frequency stability is rated at ±50 ppm over the specified operating temperature range of -40°C to +85°C. The component is housed in a compact 4-SMD, No Lead package with dimensions of 7.0 mm x 5.0 mm x 1.4 mm. It is RoHS compliant and lead-free.

Feature Summary

• Voltage controlled crystal oscillator design for precise frequency tuning
• CMOS output interface compatible with standard digital logic
• Wide operating temperature range suitable for industrial environments
• Compact surface-mount package for space-constrained PCB layouts

Applications

• Clock generation in telecommunications equipment
• Frequency synthesis in data communication systems
• Timing references in embedded control systems
• Jitter attenuation in high-speed serial links

Procurement Notes

Verify the specific manufacturer designation on the datasheet, as some distributors list this part under TXC Corporation due to manufacturing relationships. Confirm the exact pull range and stability specifications match the system requirements before ordering. Ensure the 3.3V supply voltage aligns with the target circuit design. Check for any specific handling precautions related to the ceramic or quartz construction during assembly.

Selection Notes

Select this VCXO when a stable 38.880 MHz reference with voltage-controlled tuning capability is required. The ±50 ppm APR allows for necessary frequency adjustments within the system. The CMOS output simplifies interfacing with microcontrollers or FPGAs. Consider the thermal performance if the application involves significant self-heating or extreme ambient temperatures beyond the standard range.

Part Context

This component belongs to the QTV750 series of VCXOs from QST. Similar parts in the series include the QTV750-122.880MBB-T, which offers higher stability at ±25 ppm but operates at a different frequency. The series generally provides options for various frequencies and stability grades within the same 7x5mm footprint, allowing for consistent board design across different product variants.

Replacement Considerations

Direct substitutes may include other 38.880 MHz VCXOs in 7x5mm SMD packages with CMOS outputs and similar electrical characteristics. Verify that any replacement matches the APR, stability, and voltage requirements. Cross-reference with manufacturers like TXC or Abracon for equivalent performance. Ensure pinout compatibility if replacing directly on existing PCBs.