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Product Detailed Parameters
- Description：77.75 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：77.75 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 18QHTF21-77.750-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a frequency of 77.75 MHz with LVCMOS output logic and a supply voltage of 1.8V. The device features a Standby (Power Down) function and is housed in a 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm. It supports an operating temperature range of -40°C to 85°C and offers frequency stability of ±50ppm.
Feature Summary
- Supports low power consumption via standby mode
- Compact surface-mount design for space-constrained applications
- LVCMOS output compatibility for digital interfaces
Applications
- High-speed data communication systems
- Embedded computing modules
- Industrial control equipment
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. Check for RoHS compliance status if required by your manufacturing standards. Validate the operating temperature range suitability for your intended environment.
Selection Notes
Select this component when a precise 77.75 MHz clock signal is required for LVCMOS-compatible digital circuits. Consider the ±50ppm stability for applications sensitive to timing jitter. The 1.8V supply requirement dictates compatibility with low-voltage logic families. The compact 2.0x1.6mm package is suitable for dense PCB layouts. Evaluate the standby feature if power management during idle states is critical.
Part Context
This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series typically includes various frequencies within the 1.8V LVCMOS category. Similar parts in the series include models like 18QHTF21-77.7776-PD and 18QHTF21-77.780-PD, which share identical packaging and electrical characteristics but differ in nominal frequency.
Replacement Considerations
Direct substitutes include 18QHTF21-77.7776-PD and 18QHTF21-77.780-PD from Mercury Electronics, provided the slight frequency deviation is acceptable for the application. Other manufacturers offering 77.75 MHz LVCMOS oscillators in 2.0x1.6mm packages may serve as alternatives, though pinout and electrical specs must be verified.
