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Product Detailed Parameters
- Description：77.0 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：77 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)：26mA
- 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 18QHTF21-77.000-PD is a 77.0 MHz crystal oscillator (XO) manufactured by Mercury Electronic Ind. Co., Ltd. It operates with an LVCMOS output logic and requires a 1.8V supply voltage. The device features a Standby function for power down capabilities. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. The unit supports a strip packaging format.
Feature Summary
- Supports low-voltage LVCMOS output signaling
- Includes standby mode for power management
- Utilizes surface-mount no-lead package design
Applications
- General clock signal generation
- Embedded system timing references
- Digital circuit synchronization
Procurement Notes
Verify the specific frequency tolerance and stability parameters against the official datasheet before integration. Confirm that the 1.8V supply requirement aligns with the target system's power rails. Ensure the 2.0x1.6mm footprint matches the PCB layout constraints. Check for any specific handling requirements associated with the no-lead SMD package during assembly processes.
Selection Notes
Select this component when a precise 77.0 MHz reference is required in space-constrained designs. The 1.8V operation makes it suitable for modern low-power digital systems. The integrated standby feature aids in energy efficiency applications. Consider the small form factor for high-density board layouts where larger packages are not feasible.
Part Context
This part belongs to the Mercury Electronics XO series, designed for standard clocking needs. The model number indicates the specific frequency and package type within the product line. Similar variants exist with different frequencies and voltage levels, sharing the same physical footprint and logical interface standards for consistent design implementation across projects.
Replacement Considerations
Direct substitutes must match the 77.0 MHz frequency, 1.8V supply, LVCMOS output, and 2.0x1.6mm package. Verify pinout compatibility and electrical characteristics of alternative sources to ensure functional equivalence without redesigning the host circuitry.
