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Product Detailed Parameters
- Description：1.1389 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：1.1389 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 18QHTF21-1.1389-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fundamental frequency of 1.1389 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a power-down capability via standby control. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6 mm.
Feature Summary
- LVCMOS output logic for digital interface compatibility
- Integrated power-down function for energy management
- Compact 4-SMD surface-mount package design
Applications
- General clock signal generation in embedded systems
- Timing reference for low-frequency digital circuits
- Power-sensitive portable electronic devices
Procurement Notes
Verify the specific frequency suffix matches the required 1.1389 MHz specification. Confirm the 1.8V supply voltage requirement aligns with the target circuit design. Ensure the 4-SMD No Lead package footprint corresponds to the PCB layout constraints. Check for active status availability through authorized distributors.
Selection Notes
Select this component when a precise 1.1389 MHz timing source is required within a 1.8V logic environment. The LVCMOS output ensures direct interfacing with standard digital inputs without additional level shifting. The power-down feature supports battery-operated applications requiring extended standby life. The small form factor aids in dense board layouts.
Part Context
This part belongs to the 18QHTF21 series of standard crystal oscillators from Mercury Electronic. The series offers various frequencies with consistent 1.8V operation and LVCMOS outputs. The 'PD' suffix indicates the inclusion of a power-down control pin, distinguishing it from always-on variants within the same package family.
Replacement Considerations
Direct substitutes include other 1.1389 MHz XO models with identical 1.8V LVCMOS specifications and 2.0x1.6mm SMD footprints. Verify pinout compatibility and electrical parameters before substitution.
