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Product Detailed Parameters
- Description：6.51755 MHz XO 1.8V 2.0X1.6MM PD
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：6.51755 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 18QHTF21-6.51755-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 6.51755 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a standby or power-down mode capability. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm.
Feature Summary
- Supports low-voltage operation at 1.8V
- Includes standby and power-down functionality
- Utilizes LVCMOS output logic
Applications
- Battery-powered electronic devices
- Portable consumer electronics
- General timing clock applications
Procurement Notes
Verify the specific frequency tolerance and load capacitance requirements against the official datasheet before procurement. Confirm that the 1.8V supply voltage aligns with the target system design. Ensure the 4-SMD no-lead package footprint matches the PCB layout specifications to guarantee proper soldering and mechanical stability during assembly.
Selection Notes
Select this component when a precise 6.51755 MHz reference is required for low-power systems. The LVCMOS interface ensures compatibility with standard digital logic families. Consider the 1.8V operating voltage as a primary constraint for power budgeting. The small form factor makes it suitable for space-constrained designs where minimal board area is critical.
Part Context
This part belongs to the Mercury Electronics XO series, which provides standard frequency control solutions. The 'PD' suffix indicates the inclusion of power-down capabilities, distinguishing it from continuous-operation variants. The 18QHTF21 series generally targets applications requiring stable timing signals in portable and battery-operated environments.
Replacement Considerations
Direct substitutes must match the 6.51755 MHz frequency, 1.8V supply, LVCMOS output, and 2.0x1.6mm package. Verify pinout compatibility and thermal characteristics. Cross-reference with other Mercury Electronics models in the same series if availability is an issue.
