kHz Crystal Units: Low Power Timing Solutions

kHz Crystal Units

32.768 kHz tuning-fork crystal units provide the frequency reference for timekeeping functions and low-power sleep operation in IoT devices and wearable electronics. River Eletec achieves an extremely small and ultra-thin package using its proprietary Metal Diffusion Sealing (MDS) technology, enabling compact designs for space-constrained electronic systems.
A key advantage is support for industry-leading low load capacitance (CL), enabling highly efficient oscillator circuit design and ultra-low-power operation. Despite the miniature size, the crystal maintains excellent crystal impedance (CI) characteristics, supporting stable oscillation while minimizing overall system power consumption. These characteristics make it an ideal timing solution for battery-powered devices requiring long operating life.

Product Lineup

Model	Size		Nominal frequency		Frequency tolerance	Operating temperature		E.S.R	Load capacitance	Product features
	(mm: L × W)	(mm: H Max.)	min. (kHz)	max. (kHz)	@ 25 ℃ (ppm)	min. (℃)	max. (℃)	(kΩ)
TFX-05X	1.2 × 1.0	0.35	32.768	32.768	±20, ±30, ±50, other	-40	+105	90 Max.	5.0, 7.0, 9.0, 12.5 (Please specify)	“Crystal Package”created with “Metal Diffusion Sealing”
TFX-04C	1.6 × 1.0	0.5	32.768	32.768	±10, ±20, ±30, ±50, other	-40	+105	60 Max.	5.0, 7.0, 9.0, 12.5 (Please specify)	Low-ESR type : TFX-04
TFX-04	1.6 × 1.0	0.5	32.768	32.768	±10, ±20, ±30, ±50, other	-40	+105	90 Max.	5.0, 7.0, 9.0, 12.5 (Please specify)
TFX-03C	2.0 × 1.2	0.6	32.768	32.768	±10, ±20, ±30, ±50, other	-40	+105	50 Max.	5.0, 7.0, 9.0, 12.5 (Please specify)	Low-ESR type : TFX-03
TFX-03	2.0 × 1.2	0.6	32.768	32.768	±10, ±20, ±30, ±50, other	-40	+105	90 Max.	5.0, 7.0, 9.0, 12.5 (Please specify)
TFX-02S	3.2 × 1.5	0.8	32.768	32.768	±10, ±20, ±30, ±50, other	-40	+105	70 Max.	7.0, 9.0, 12.5 (Please specify)