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Product Detailed Parameters
- Description：1.234567 MHz XO 1.8V 2.0X1.6 PD
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：1.234567 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 18QHTF21-1.234567-PD is a standard crystal oscillator manufactured by Mercury Electronic Ind. Co., Ltd. It operates at a frequency of 1.234567 MHz and utilizes LVCMOS output logic. The device supports a supply voltage of 1.8V and includes a standby or power-down function for energy management. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.0mm x 1.6mm.
Feature Summary
- Integrates LVCMOS output interface for digital signal compatibility
- Supports standby mode to reduce power consumption during idle periods
- Utilizes surface-mount packaging for automated assembly integration
Applications
- General clock source for embedded systems
- Timing reference for low-frequency digital circuits
- Power-sensitive portable electronic devices
Procurement Notes
Verify the specific frequency suffix matches the required 1.234567 MHz specification. Confirm the 1.8V operating voltage aligns with the target circuit design. Ensure the 4-SMD no-lead package footprint corresponds to the PCB layout requirements. Check for RoHS compliance status if environmental regulations apply to the final product.
Selection Notes
Select this component when a precise 1.234567 MHz timing reference is required. Consider the 1.8V supply constraint and LVCMOS output levels. Evaluate the need for power-down functionality against system power budgets. Compare physical dimensions against available board space constraints.
Part Context
This part belongs to the 18QHTF21 series of surface-mount oscillators from Mercury Electronic. The series offers various frequencies within a standardized 2.0x1.6mm footprint. The PD suffix indicates the inclusion of a power-down control feature, distinguishing it from continuous-output variants.
Replacement Considerations
Direct substitutes must match the 1.234567 MHz frequency, 1.8V voltage, and LVCMOS output type. Verify pinout compatibility for the 4-SMD no-lead package. Cross-reference with other manufacturers offering identical electrical specifications and mechanical dimensions.
