Seiko Instruments Inc. (President: Yoichi Endo; Headquarters: Chiba City, Chiba Prefecture; hereinafter “SII”) will begin mass production of the “SC-10S” (32.768kHz), the world’s smallest* tuning-fork crystal resonator measuring 1.0 × 0.8mm, starting in April 2026.
*Based on SII research as of November 2025.
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Product Image-1
[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 × 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 × 0.8 × 0.32mm).
[Main Features]
1. World’s Smallest Size
Using 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 × 0.8 × 0.32mm.
2. Low ESR (90 kΩ 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 90kΩ max., equivalent to that of existing models.
3. High Shock Resistance and Frequency Stability
The SC-10S ensures excellent frequency stability even in environments subjected to shock or vibration, delivering highly reliable operation.
[Main specifications] |
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Item |
Specification |
|
Dimensions |
1.0 x 0.8 x 0.32mm |
|
Nominal Frequency |
32.768kHz |
|
Frequency Tolerance |
±20×10-6 |
|
Turnover Temperature |
+25±5°C |
|
Parabolic Coefficient |
(-0.036±10%)×10-6/°C2 |
|
Load Capacitance |
4pF, 6pF, 7pF, 9pF, 12.5pF |
|
Motional Resistance (ESR) |
90kΩ max. |
|
Absolute Maximum Drive Level |
0.3μW max. |
|
Recommended Drive Level |
0.1μW typ. |
|
Shunt Capacitance |
1.1pF |
|
Frequency Ageing |
±5×10-6/year |
|
Operating Temperature Range |
-40 to +85°C |
|
Storage Temperature Range |
-55 to +125°C |
|
[Main Applications]
Smart rings, smartwatches, smart tags, hearing aid
Communication modules such as Bluetooth and LPWA
Clock frequency source for RTCs (Real-Time Clocks)
Sub-clock for various microcontrollers
[Production Schedule]
Sample Shipments Begin: December 2025
Mass Production Start: April 2026
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