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Product Detailed Parameters
- Description：12.7455 MHz XO 1.8V 2.0X1.6MM PD
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：12.7455 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)：22mA
- 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 18QHTF21-12.7455-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 12.7455 MHz with LVCMOS output logic. The device requires a 1.8V supply voltage and features a Standby function for power down control. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.
Feature Summary
- Supports standby mode for power management
- Compact surface-mount form factor
Applications
- Digital signal processing systems
- Communication equipment timing references
- Embedded microcontroller clock sources
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against the target circuit design before procurement. Confirm that the 1.8V supply rail is stable and within the operational limits specified in the official datasheet. Ensure the PCB footprint matches the 4-SMD No Lead package dimensions to guarantee proper soldering and mechanical stability during assembly processes.
Selection Notes
Select this component when a precise 12.7455 MHz reference is required for LVCMOS-compatible digital circuits. The choice is driven by the need for low-voltage operation at 1.8V and the integration of a power-down feature to reduce energy consumption during idle states. The small 2.0x1.6 mm package makes it suitable for space-constrained portable or high-density electronic designs.
Part Context
This oscillator belongs to the QHTF series from Mercury Electronics, designed for general-purpose clock generation. The series typically offers standard frequency options with LVCMOS outputs. The 'PD' suffix indicates the inclusion of a power-down pin functionality, allowing external control over the active state of the oscillator to conserve power in battery-operated applications.
Replacement Considerations
Direct substitutes must match the 12.7455 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify compatibility of the standby pin configuration with existing board layouts.
