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Product Detailed Parameters
- Description：74.571428 M XO 1.8V 2.0X1.6MM PD
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：74.571428 MHz
- Function：Standby (Power Down)
- Output：LVCMOS
- Voltage - Supply：1.8V
- Frequency Stability：±50ppm
- Absolute Pull Range (APR)：-
- Operating Temperature：-40°C ~ 85°C
- Spread Spectrum Bandwidth：-
- Current - Supply (Max)：26mA
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：4-SMD, No Lead
- Size / Dimension：0.079" L x 0.063" W (2.00mm x 1.60mm)
- Height - Seated (Max)：0.031" (0.80mm)
- Supplier Device Package：-
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Overview
The 18QHTF21-74.571428-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 74.571428 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and features a Standby (Power Down) control function for power management. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications.
Feature Summary
- Supports Standby (Power Down) mode for reduced power consumption
- Utilizes LVCMOS output logic for digital interface compatibility
- Designed as a standard XO with precise frequency stability
Applications
- Digital signal processing systems requiring clock synchronization
- Communication equipment utilizing LVCMOS interfaces
- Portable electronic devices necessitating low-power standby modes
Procurement Notes
Verify the exact frequency tolerance and load capacitance specifications against the official datasheet before integration. Confirm that the 1.8V supply voltage aligns with the target system's power rails. Ensure the 4-SMD No Lead package dimensions fit within the designated PCB footprint constraints to avoid mechanical interference during assembly.
Selection Notes
Select this component when a specific 74.571428 MHz frequency is required alongside LVCMOS signaling standards. Consider the 1.8V operating voltage requirement for compatibility with modern low-voltage logic families. Evaluate the need for a Standby feature if power efficiency during idle states is a critical design parameter for the application.
Part Context
This part belongs to Mercury Electronics' line of quartz-based frequency control products. Mercury has specialized in manufacturing crystals and oscillators since 1973, establishing itself as a pioneer in the Taiwan quartz industry. The company produces various frequency control solutions including TCXOs and OCXOs, supporting diverse industrial and consumer electronics markets.
Replacement Considerations
No public confirmed substitute part numbers are available in the provided documentation. Direct replacement requires matching the 74.571428 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD No Lead package form factor from other manufacturers.
