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Product Detailed Parameters
- Description：1.205888 MHz XO 1.8V 2.0X1.6 PD
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：1.205888 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)：21mA
- 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 18QHTF21-1.205888-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fundamental frequency of 1.205888 MHz and utilizes LVCMOS output logic levels. The device is designed for a supply voltage of 1.8V and features a power-down (Standby) control function to reduce consumption when inactive. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm.
Feature Summary
- Supports low-voltage operation at 1.8V for energy-efficient applications
- Includes standby mode capability for power management
- Provides stable LVCMOS signal output
- Utilizes a small form-factor surface-mount package
Applications
- Battery-powered portable electronic devices
- Low-power consumer electronics
- Embedded systems requiring precise timing references
- Communication modules with strict size constraints
Procurement Notes
Verify the specific suffix 'PD' indicates the Power Down feature as documented. Confirm the operating temperature range and load capacitance requirements against the official datasheet before integration. Ensure the 1.8V supply rail stability meets the component's noise immunity specifications. Cross-reference the pinout diagram with the PCB layout design to prevent soldering defects on the no-lead package.
Selection Notes
Select this component when a 1.205888 MHz reference is required in ultra-compact designs. The 1.8V supply requirement limits compatibility with 3.3V-only systems without level shifting or voltage regulation. The power-down feature is critical for applications demanding extended battery life. Evaluate the 2.0x1.6mm footprint against available board space constraints.
Part Context
This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz-based frequency control products. The series includes various frequencies and packages, with the '18QHTF21' prefix denoting the specific 2.0x1.6mm SMD form factor. Mercury Electronics has produced these components since 1973, focusing on Taiwan-manufactured timing solutions.
Replacement Considerations
Direct substitutes include other 1.205888 MHz XO units in 2.0x1.6mm packages with LVCMOS outputs and 1.8V operation. Verify electrical parameters such as frequency tolerance and phase noise match the original specification. Check if alternative manufacturers offer equivalent power-down functionality.
