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Product Detailed Parameters
- Description：12.5445 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：12.5445 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 18QHTF21-12.5445-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 12.5445 MHz with an LVCMOS output logic level. The device requires a 1.8V supply voltage and features a standby (power down) function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.00mm x 1.60mm.
Feature Summary
- Supports low voltage operation at 1.8V
- Includes standby mode capability
- Utilizes LVCMOS output interface
Applications
- Battery-powered portable devices
- General clock signal generation
- Embedded system timing references
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Confirm that the 1.8V supply rail is stable within the operational limits defined 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.
Selection Notes
Select this component when a precise 12.5445 MHz reference is required in space-constrained designs. The 1.8V operation makes it suitable for modern low-power digital circuits. Consider the standby feature if power conservation is critical. Compare against other models in the 18QHTF series for alternative frequencies or package options if specifications do not align perfectly.
Part Context
This part belongs to the 18QHTF series of surface-mount crystal oscillators from Mercury Electronics. The series typically offers various frequencies and voltage levels. The 'PD' suffix indicates the inclusion of a power-down pin or functionality. These components are designed for applications requiring reliable timing signals in small form factors.
Replacement Considerations
Direct substitutes must match the 12.5445 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD package. Verify electrical parameters such as phase noise and jitter against the original specification. Cross-reference with other manufacturers offering similar MEMS or ceramic oscillators if availability is an issue.
