March 12, 2021
Nihon Dempa Kogyo Co., Ltd.
Representative Director and President
Hiromi Katoh
Developed the world's smallest 1.2×1.0mm size tuning fork type quartz crystal unit
for pacemakers with MRI-compatible
Nihon Dempa Kogyo Co., Ltd. has developed the world's smallest class (*1) 1.2×1.0mm-sizedtuning fork type quartz crystal unit

for use in MRI-compatible pacemakers, and has begun

sample shipments since January 2021.
In recent years, the demand for pacemakers has been increasing year by year with the aging society, butone of the issues is that people who have pacemaker implantation cannot undergo MRI examinations.
This is because the ferromagnetic materials contained in the pacemaker components may be affected bymagnetic fields and cause abnormal operation.
To solve this problem, we have been studying the reduction of ferromagnetic materials
contained in the tuning fork type quartz crystal unit , one of the components, and havesucceeded in developing a tuning fork type quartz crystal unit

for pacemakers that canaccommodate such MRI inspections.
Commercially available conventional tuning fork type quartz crystal unit use materials that
contain a large amount of magnetic materials (metal covers), but we have replaced them withceramic material covers that contain a small amount of magnetic materials, and have developed
packaging methods that differ from conventional products to minimize the effects of magnetic
fields and ensure quality that satisfies the standard

for medical devices.

Pacemaker equipment has also evolved. Conventional products use a body implanted into the humanbody to connect the lead wires (electrodes) to the heart. However, the development of the direct
implantable leadless type has greatly reduced the size. The components used in pacemakers are also
required to be miniaturized, and in order to meet this need, we have developed and marketed theworld's smallest 1.2 x 1.0mm size tuning fork type quartz crystal unit
1.2mm size (NX2012VA) and 3.2 x 1.5mm size (NX3215VA) products.

in addition to the 2.0 x

In order to realize the world's smallest tuning fork type quartz crystal unit withfewer ferromagnetic materials, we have realized this product with ultra-compact size andhigh reliability by utilizing FEM analysis (*2) simulation on the quartz crystal element
mounted in the package (housing ) and applying high-definition processing technology
using photolithography method.
We will continue to contribute to the realization of a safe, secure and comfortable society throughour quartz device and crystal application equipment businesses.
(*1) Jan. 2021, our survey(*2) FEM analysis is a finite element method (Finite Element Method) which is a numericalanalysis method (simulation method) for differential-equation approximate solutions thatare difficult to solve analytically.
[Sample] Sample shipment started in January 2021
[Product name] NX1210VA[Outline Photo]Developed productComparison of size with0.5mmφ lead mechanical pencil

NX1210VA(1.2×1.0mm, 2.0×1.2mm,3.2×1.5mm from the left)【 Product characteristic】
Product Name

NX1210VA

Product Size

1.2 × 1.0 × 0.45mm

Nominal Frequency

32.768kHz

Frequency Tolerance (+25℃+/-3℃)+/-20×10-6

Operating Temperature Range-40 to +85℃

Equivalent Series Resistance

90kΩMax.

Load Capacity

12.5pF

Turning point Temperature+25℃+/-5℃

Temperature Coefficient-0.04×10-6/℃²Max.

[Contact]
NIHON DEMPA KOGYO CO., LTD.
e-mail ：newsrelease@ndk.com

MRI-compatible product(3.2 × 1.5mm size)