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Product Detailed Parameters
- Description：7.9875 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：7.9875 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 18QHTF21-7.9875-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 7.9875 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package, suitable for surface-mount applications requiring precise timing signals.
Feature Summary
- LVCMOS output logic for digital interface compatibility
- Integrated standby mode for power reduction
- Surface-mount 4-SMD no lead package design
Applications
- General purpose timing reference circuits
- Digital signal processing systems
- Communication equipment clock sources
Procurement Notes
Verify the specific ordering suffix PD against the manufacturer's current datasheet to confirm package type and tape/reel specifications. Ensure the 1.8V supply requirement aligns with the target system voltage rails. Confirm that the 4-SMD no lead footprint matches the PCB land pattern design to avoid assembly issues.
Selection Notes
Select this component when a low-voltage 1.8V operation is required alongside standard LVCMOS signaling levels. The choice depends on the need for a compact 4-pin SMD form factor and the availability of a standby control feature. Evaluate thermal performance and frequency stability requirements against the standard XO specifications provided in the official documentation.
Part Context
This part belongs to the 18QHTF21 series of crystal oscillators from Mercury Electronics Ind. Co. Ltd. The series typically offers various frequencies within a small footprint. The 'PD' suffix likely indicates a specific packaging variant, such as tape and reel, distinct from bulk or other handling methods offered in the same product family.
Replacement Considerations
Direct substitutes must match the 7.9875 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no lead package dimensions. Verify pinout compatibility and electrical characteristics before swapping. Consult the manufacturer's cross-reference list for approved alternatives.
