SWS1446D48B-32.768K

Crystals Overview

The SWS1446D48B-32.768K is a surface-mount tuning fork crystal manufactured by Suntsu Electronics, Inc., designed for precise timekeeping applications. It operates at a nominal frequency of 32.768 kHz with a frequency tolerance of ±20 ppm. The component features a load capacitance of 6 pF and an equivalent series resistance (ESR) of 50 kOhms. It utilizes a 4-SOJ package with a 2.29 mm pitch, measuring 9.60 mm in length, 4.06 mm in width, and up to 3.60 mm in height. The device supports base mode operation within a temperature range of -40°C to +85°C.

Crystals Feature Summary

• Provides direct replacement compatibility for discontinued Epson MC-406 crystals with identical electrical parameters and physical dimensions.
• Ensures design continuity by maintaining the same footprint and layout requirements as original components.
• Delivers stable oscillation performance suitable for low-power real-time clock circuits.

Crystals Applications

• Real-time clock modules in consumer electronics
• Timekeeping systems in industrial control equipment
• Battery-powered wearable devices requiring precise frequency stability

Crystals Procurement Notes

Verify that the target application requires a 6 pF load capacitance, as this specific parameter distinguishes the SWS1446 variant from other SWS144 series options such as the 12 pF or 9 pF versions. Confirm that the 4-SOJ package dimensions align with the existing PCB silkscreen and copper pad layout to ensure proper surface mount assembly. Check datasheet specifications for ESR limits to guarantee circuit stability under operating conditions.

Crystals Selection Notes

Select this component when replacing obsolete Epson MC-406 units to avoid redesigning the oscillator circuit. Ensure the system design accommodates the specified ±20 ppm tolerance and 50 kOhm ESR. Verify that the operating environment remains within the -40°C to +85°C range. Consider the 6 pF load capacitance requirement against the host microcontroller's internal capacitance settings to maintain accurate frequency output.

Crystals Part Context

This part belongs to the SWS144 series, which Suntsu Electronics developed specifically as seamless replacements for discontinued high-frequency and 32.768 kHz crystals. The series maintains consistent size and electrical characteristics to minimize engineering costs associated with design modifications. Unlike the SXT144 series used for higher frequencies, the SWS144 line focuses on standard watch crystal frequencies with optimized pin-out compatibility.

Crystals Replacement Considerations

Publicly confirmed substitute: SWS1446D48A-32.768K. This alternative shares identical electrical specifications and package dimensions but may differ in manufacturing lot or minor cosmetic attributes. Both parts serve as direct drop-in replacements for the discontinued Epson MC-406 32.7680K-E0.