QTM216E-37.400MDM-T

Overview

The QTM216E-37.400MDM-T is a low EMI clock oscillator manufactured by QST, designed to mitigate electromagnetic interference in high-speed digital circuits. It operates at a nominal frequency of 37.4 MHz and utilizes a phase modulation technique to spread the clock spectrum, thereby reducing radiated emissions without requiring external filtering components. The device supports supply voltages of 1.8V, 2.5V, and 3.3V, ensuring compatibility with various logic families. It is housed in a compact 2.0x1.6x0.76mm SMD ceramic package, suitable for space-constrained applications such as mobile devices and industrial equipment. The component features a dedicated control pin for enabling or disabling the low EMI mode, allowing flexible integration into system designs.

Feature Summary

• Integrated phase modulation circuitry reduces electromagnetic interference by spreading the clock spectrum, eliminating the need for additional external filtering components.
• Dediable low EMI mode via a single GPIO control pin, providing flexibility to switch between standard and low emission operation based on system requirements.
• Wide supply voltage compatibility supporting 1.8V, 2.5V, and 3.3V rails, facilitating integration across diverse platform architectures.
• Compact surface-mount ceramic package design optimized for high-density PCB layouts in portable and industrial electronics.

Applications

• High-definition video transmission systems requiring precise clocking with minimal signal integrity degradation
• Mobile consumer electronics and wearable devices with strict spatial constraints and EMC certification requirements
• Industrial automation controllers operating in electrically noisy environments
• Automotive infotainment and sensor interfaces demanding reliable clock signals under varying thermal conditions

Procurement Notes

Verify the specific suffix codes against official QST documentation to confirm exact frequency tolerance, temperature range, and packaging specifications. Ensure that the selected variant matches the required supply voltage and output interface for your target application. Cross-reference the part number with authorized distributors to confirm authenticity and availability. Request detailed datasheets and reliability reports prior to finalizing procurement decisions to ensure compliance with project standards.

Selection Notes

Select this component when designing systems where electromagnetic interference is a critical constraint and board space is limited. Consider the trade-off between phase noise performance and EMI reduction capabilities when configuring the control pin. Evaluate the thermal management requirements if operating at the upper end of the specified temperature range. Confirm that the output swing levels are compatible with the receiving logic inputs to ensure signal integrity across all operating conditions.

Part Context

The QTM216E series represents QST's solution for low EMI clock generation in compact form factors. This model belongs to a family of oscillators designed to replace traditional crystal oscillators that require extensive filtering. The series targets markets sensitive to radiated emissions, offering a software-configurable alternative to hardware-based mitigation strategies. It complements other QST timing solutions by providing a balance between performance, size, and ease of integration.

Replacement Considerations

Direct substitutes may include other low EMI oscillators from manufacturers such as SiTime or Microchip, provided they offer similar frequency stability and package dimensions. Verify that any replacement maintains the same control pin functionality for EMI mode switching. Ensure that the alternative component meets the same electrical specifications regarding supply voltage and load capacitance to avoid redesign efforts.