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Product Detailed Parameters
- Description：12.68857 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：12.68857 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 18QHTF21-12.68857-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 12.68857 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and includes a standby or power-down function. It is housed in a compact 4-SMD, no lead package with dimensions of 2.0 x 1.6 mm.
Feature Summary
- Supports low-voltage operation at 1.8V
- Integrates standby and power-down functionality
- Provides LVCMOS output signal compatibility
Applications
- General clock generation in embedded systems
- Timing reference for digital circuits
- Portable electronic devices requiring low power consumption
Procurement Notes
Verify the specific frequency tolerance and operating temperature range against the official datasheet before integration. Confirm that the 1.8V supply requirement aligns with the target system's power architecture. Ensure the 4-SMD no-lead package footprint matches the PCB design constraints to guarantee proper soldering and mechanical stability.
Selection Notes
Select this component when a precise 12.68857 MHz timing source is required for low-power applications. The choice is driven by the need for LVCMOS interface compatibility and the availability of a power-down mode to extend battery life in portable designs. Consider the small form factor suitable for space-constrained layouts.
Part Context
This part belongs to the 18QHTF21 series from Mercury Electronics, which specializes in quartz crystal frequency control products. The series offers various frequencies within a standardized 2.0x1.6mm SMD package. The manufacturer has decades of experience in Taiwan's quartz industry, providing reliable timing solutions for global electronics markets.
Replacement Considerations
Direct substitutes include other 12.68857 MHz oscillators with identical 1.8V LVCMOS specifications and 4-SMD no-lead packages. Verify pinout compatibility and thermal characteristics when cross-referencing with alternative manufacturers' offerings.
