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Product Detailed Parameters
- Description：77.76 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：77.76 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 18QHTF21-77.760-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 77.76 MHz and utilizes LVCMOS output logic. The device requires a 1.8V supply voltage and features a standby function for power down control. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. The component supports an operating temperature range of -40°C to 85°C and maintains a frequency stability of ±50ppm.
Feature Summary
- Supports standby mode for power management
- LVCMOS output interface
- Compact 4-SMD no lead package
Applications
- Telecommunications equipment
- Data communication devices
- Consumer electronics
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against your circuit design before procurement. Ensure the 1.8V supply rail is stable within the specified operating temperature range. Confirm that the PCB footprint matches the 4-SMD no lead package dimensions to avoid assembly issues. Check for any specific handling instructions regarding electrostatic discharge sensitivity during storage and installation.
Selection Notes
Select this component when a low-voltage 1.8V clock source is required for space-constrained designs. The LVCMOS output is suitable for direct interfacing with digital logic circuits. Consider the ±50ppm stability for applications requiring moderate frequency accuracy. The wide operating temperature range makes it suitable for industrial or automotive environments where thermal variations are expected.
Part Context
This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies in a small form factor. Similar models include the 18QHTF21-96.768-PD and 18QHTF21-51.200-PD, differing primarily in output frequency. The series is characterized by its low profile and power-down capability, catering to modern portable and high-density electronic systems.
Replacement Considerations
Direct substitutes must match the 1.8V supply, LVCMOS output, and 4-SMD package. Verify frequency compatibility if replacing with other variants in the same series. Cross-reference with other manufacturers offering similar SMD oscillators, ensuring pinout and electrical specifications align.
