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Product Detailed Parameters
- Description：7.9925 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：7.9925 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 18QHTF21-7.9925-PD is a standard crystal oscillator manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 7.9925 MHz and utilizes LVCMOS output logic. The device is designed for low-voltage applications with a supply voltage of 1.8V. It features a Standby (Power Down) control function to manage power consumption. The component 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 standby mode for power management
- Compact surface-mount form factor
Applications
- Battery-powered portable devices
- Low-power embedded systems
- Digital signal processing circuits
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against the system design specifications before procurement. Ensure that the 1.8V supply voltage aligns with the target circuit's power rails. Confirm the availability of the 4-SMD no-lead package variant suitable for automated assembly processes.
Selection Notes
Select this component when a precise 7.9925 MHz clock source is required for low-voltage logic interfaces. Consider the 1.8V operating voltage as a primary constraint for power-sensitive designs. Evaluate the physical footprint constraints to ensure the 2.0x1.6 mm package fits within the designated PCB area without compromising thermal or mechanical integrity.
Part Context
This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronic. The series typically offers various standard frequencies and supports low-voltage operation. The 'PD' suffix indicates the inclusion of a power-down feature, distinguishing it from continuous-operation variants within the same family.
Replacement Considerations
Direct substitutes include other 18QHTF21 series parts with identical pinout and voltage specifications but different frequencies, such as 18QHTF21-8.000-PD or 18QHTF21-7.9875-PD, provided the frequency difference is acceptable for the application.
