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Product Detailed Parameters
- Description：1.28 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：1.28 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 18QHTF21-1.280-PD is a crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a fundamental frequency of 1.28 MHz and utilizes LVCMOS output logic. The device is designed for a supply voltage of 1.8V and features a power-down (standby) mode capability. It is housed in a compact 4-SMD, No Lead package with dimensions of 2.5x2.0 mm. The maximum supply current is specified at 21 mA. This component serves as a standard clock source for digital circuits requiring precise timing.
Feature Summary
- Integrates LVCMOS output logic for direct digital interface compatibility
- Supports power-down mode to reduce energy consumption during standby periods
- Utilizes a base crystal resonator for stable frequency generation
Applications
- Battery-powered portable electronic devices
- Digital signal processing systems
- Microcontroller clock sources
Procurement Notes
Verify the specific ordering suffix and package variant against the manufacturer's latest datasheet before procurement. Confirm that the 1.8V supply requirement aligns with the target system design. Ensure the 4-SMD no-lead footprint matches the PCB layout specifications to avoid assembly issues.
Selection Notes
Select this component when a low-voltage 1.8V operation is required alongside a 1.28 MHz reference frequency. Consider the 21 mA maximum current draw for power budget calculations. The compact 2.5x2.0 mm package is suitable for space-constrained designs compared to larger oscillator footprints.
Part Context
Mercury Electronic Ind. Co., Ltd. has been manufacturing frequency control products since 1973 and is recognized as a pioneer in the quartz crystal industry in Taiwan. The company produces various oscillators and crystals, positioning itself as a specialized supplier for precision timing applications within the electronics supply chain.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with alternative models based on matching electrical parameters and mechanical footprint requirements.
