Industry Insights 03 Jan 2026 views ( )

SII Starts Mass Production of World\'s Smallest Tuning Fork Crystal Resonator ＂SC-10S＂ (1.0×0.8×0.32mm)

SII Electronics Co., Ltd. (President: Yoichi Endo; Head Office: Chiba City, Chiba Prefecture; hereinafter "SII") will begin mass production of the world's smallest* tuning-fork crystal resonator "SC-10S" (32.768 kHz), measuring just 1.0×0.8 mm, in April 2026.
*Based on SII research as of November 2025.

[Development Background]
SII previously mass-produced the 1.2×1.0 mm "SC-12S" (32.768 kHz), one of the world’s smallest tuning-fork crystal resonators. As wearable devices such as smart rings and smartwatches, along with IoT devices, continue to shrink in size, there is an increasing demand for higher component density, lower power consumption, and improved performance in embedded electronic components. To meet these needs, SII has developed and will mass-produce the SC-10S—the world’s smallest tuning-fork crystal resonator—using its proprietary photolithography technology. The new device reduces mounting area by 33% compared to existing models, with dimensions of just 1.0×0.8×0.32 mm.

[Key Features]
1. World’s Smallest Size
Utilizing SII’s proprietary photolithography technology capable of forming fine patterns on quartz wafers, the SC-10S achieves high-precision fabrication in the world’s smallest size (1.0×0.8×0.32 mm) for a 32.768 kHz tuning-fork crystal resonator.

2. Low ESR (90 kΩ Max)
Miniaturization typically leads to increased equivalent series resistance (ESR). However, through SII’s unique design and manufacturing technologies, the SC-10S maintains a low ESR comparable to existing models, with a maximum of only 90 kΩ.

3. High Shock Resistance and Frequency Stability
The SC-10S ensures excellent frequency stability even under shock or vibration, enabling highly reliable operation.

[Main Specifications]

Item

Specification

Dimensions

1.0×0.8×0.32 mm

Nominal Frequency

32.768 kHz

Frequency Tolerance

±20×10??

Turnover Temperature

+25±5°C

Parabolic Coefficient

(-0.036±10%)×10?? /°C2

Load Capacitance

4 pF, 6 pF, 7 pF, 9 pF, 12.5 pF

Motional Resistance (ESR)

90 kΩ Max

Absolute Maximum Drive Level

0.3 μW Max

Recommended Drive Level

0.1 μW Typ

Shunt Capacitance

1.1 pF

Frequency Aging

±5×10?? /year

Operating Temperature Range

-40～+85°C

Storage Temperature Range

-55～+125°C

[Main Applications]
Smart rings, smartwatches, smart tags, hearing aids
Communication modules such as Bluetooth and LPWA (Low-Power Wide-Area Networks)
Clock frequency source for real-time clocks (RTC)
Sub-clocks for various microcontrollers

[Production Schedule]
Sample shipments: December 2025
Start of mass production: April 2026

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