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Product Detailed Parameters
- Description：8.448 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：8.448 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 18QHTF21-8.448-PD is a standard crystal oscillator (XO) manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a fixed frequency of 8.448 MHz and utilizes LVCMOS output logic levels. The device is designed for low-voltage applications, requiring a 1.8V supply voltage. It features a power-down standby function to reduce energy consumption when not in active use. The component is housed in a compact 4-SMD, No Lead package with dimensions of 2.0 x 1.6 mm, suitable for surface-mount assembly processes.
Feature Summary
- LVCMOS output interface
- Power-down standby capability
- Compact 4-SMD no-lead package
Applications
- Digital signal processing systems
- Communication equipment timing
- Embedded microcontroller clock sources
Procurement Notes
Verify the exact operating temperature range and load capacitance requirements against the specific application design before procurement. Ensure that the 1.8V supply voltage aligns with the target system's power rails. Confirm that the 4-SMD package footprint matches the PCB layout specifications to avoid assembly issues.
Selection Notes
Select this component when a precise 8.448 MHz reference is required for LVCMOS-compatible circuits. Consider the power-down feature if energy efficiency during idle states is critical. The small form factor makes it suitable for space-constrained designs compared to larger through-hole alternatives.
Part Context
This part belongs to the 18QHTF21 series from Mercury Electronics, which offers various frequencies within the same physical package. The series supports different output voltages and logic types. The 'PD' suffix indicates the inclusion of a power-down control pin, distinguishing it from continuous-operation variants in the same family.
Replacement Considerations
Direct replacements must match the 8.448 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD 2.0x1.6mm package. Verify pinout compatibility for the power-down function. Cross-reference with other manufacturers offering similar SMD oscillators ensuring identical electrical characteristics.
