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[Background of Development]SII has already been mass-producing the "SC-12S" (32.768kHz), one of the world's smallest tuning-fork crystal resonators at 1.2 x 1.0mm. As wearable devices such as smart rings and smartwatches, as well as IoT devices, continue to become smaller, the electronic components built into these devices are increasingly required to support high-density mounting, low power consumption, and high performance. To meet these needs, SII leveraged its proprietary photolithography technology to develop and mass-produce the world's smallest tuning-fork crystal resonator, the "SC-10S," which achieves a 33% reduction in mounting area compared to existing models (1.0 x 0.8 x 0.32mm).

[Main Features]1. World's Smallest SizeUsing SII's proprietary photolithography technology, which forms fine patterns on quartz wafers, the SC-10S achieves high-precision processing at the world's smallest size for a 32.768kHz tuning-fork crystal resonator: 1.0 x 0.8 x 0.32mm.

2. Low ESR (90 k? max.)Miniaturization typically leads to an increase in ESR (Equivalent Series Resistance). However, through SII's proprietary design and manufacturing technologies, the SC-10S maintains a low ESR of 90k? max., equivalent to that of existing models.

3. High Shock Resistance and Frequency StabilityThe SC-10S ensures excellent frequency stability even in environments subjected to shock or vibration, delivering highly reliable operation.

-0- *T [Main specifications]ItemSpecificationDimensions1.0 x 0.8 x 0.32mmNominal Frequency32.768kHzFrequency Tolerance+-20x10-6Turnover Temperature+25+-5°CParabolic Coefficient(-0.036+-10%)x10-6/°C2Load Capacitance4pF, 6pF, 7pF, 9pF, 12.5pFMotional Resistance (ESR)90k? max.Absolute Maximum Drive Level0.3?W max.Recommended Drive Level0.1?W typ.Shunt Capacitance1.1pFFrequency Ageing+-5x10-6/yearOperating Temperature Range-40 to +85°CStorage Temperature Range-55 to +125°C*T

[Main Applications]Smart rings, smartwatches, smart tags, hearing aidCommunication modules such as Bluetooth and LPWAClock frequency source for RTCs (Real-Time Clocks)Sub-clock for various microcontrollers

[Production Schedule]Sample Shipments Begin: December 2025Mass Production Start: April 2026

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Contact

[Contact Information]Media RelationsSeiko Instruments Inc.Corporate Planning Division, Public Relations SectionContact Form: https://www.sii.co.jp/en/contact/sii_inquiry

CustomerSeiko Instruments Inc.Electronic Devices Business Promotion Division, Sales Promotion DepartmentContact Form: https://www.sii.co.jp/en/quartz/contact TEL: +81-43-211-1207

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