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Product Detailed Parameters
- Description：6.78 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：6.78 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 18QHTF21-6.780-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 6.78 MHz and utilizes an LVCMOS output interface. The device is designed for a supply voltage of 1.8V and features a power-down mode for standby applications. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0x1.6 mm.
Feature Summary
- Supports low-voltage operation at 1.8V
- Includes power-down functionality for energy efficiency
- Utilizes LVCMOS output signal compatibility
Applications
- Battery-powered portable devices
- General-purpose digital timing circuits
- Low-power embedded systems
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 guarantee proper soldering and mechanical stability during assembly.
Selection Notes
Select this component when a precise 6.78 MHz clock source is required for low-voltage logic families. Consider the small 2.0x1.6 mm form factor for space-constrained designs. Evaluate the power consumption characteristics if battery life is a critical constraint, noting the availability of a power-down state for idle periods.
Part Context
This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronic. The series typically offers various frequencies within a standardized 4-pin SMD package. These components are engineered for stable frequency generation in consumer electronics and industrial control applications requiring reliable timing signals.
Replacement Considerations
Direct substitutes include other 18QHTF21 series variants with identical pinouts and electrical characteristics but different frequencies, such as 18QHTF21-6.000-PD or 18QHTF21-8.000-PD, provided the system clock requirement can be adjusted accordingly.
