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Product Detailed Parameters
- Description：1.544 MHz XO 1.8V 2.0X1.6 MM PD
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：1.544 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 18QHTF21-1.544-PD is a crystal oscillator manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 1.544 MHz with a supply voltage of 1.8V. The device features an LVCMOS output type and includes a standby (power down) function. It is housed in a 4-SMD, No Lead package with dimensions of 2.0x1.6 mm.
Feature Summary
- Supports low voltage operation at 1.8V for energy efficiency
- Includes standby mode to reduce power consumption during idle periods
- Utilizes compact surface-mount packaging for space-constrained designs
Applications
- Battery-powered portable devices
- Low-power consumer electronics
- Embedded systems requiring precise timing references
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Confirm that the 1.8V supply voltage aligns with your system's power rails. Ensure the 4-SMD no-lead package footprint matches your PCB layout specifications to avoid assembly issues.
Selection Notes
Select this component when a low-frequency reference around 1.544 MHz is required with minimal power consumption. The integrated standby feature makes it suitable for applications where power management is critical. Consider the small form factor if board space is limited compared to larger oscillator packages.
Part Context
This part belongs to the 18QHTF21 series from Mercury Electronics, which focuses on low-voltage crystal oscillators. The series offers various frequencies tailored for digital communication and timing applications. The 'PD' suffix indicates the presence of a power-down control pin, enhancing operational flexibility in battery-sensitive environments.
Replacement Considerations
Direct substitutes must match the 1.544 MHz frequency, 1.8V supply, and 4-SMD no-lead package. Verify equivalent electrical characteristics such as current consumption and output drive strength. Cross-reference with other manufacturers offering similar low-profile oscillators with standby functionality.
