Actual size
Crystal unit
S
p
ecifications
(
characteristics
)
Item Symbol Specifications Conditions / Remarks
Nominal frequency range f_nom 32.768 kHz 20 kHz to 120 kHz Please contact us about available frequencies.
Storage temperature T_stg -55 C to +125 C Storage as single product.
Operating temperature T_use -40 C to +85 C
Level of drive DL 1.0
W Max.
Frequency tolerance (standard) f_tol 20 10-6,
50
10-6
50
10-6,
100
10-6 +25 C, DL=0.1 W
Turnover temperature Ti +25 C
5 C
Parabolic coefficient B -0.04
10-6 / °C2Max.
Load capacit ance CL 6 pF to
(standard :12.5 pF) Please specify
Motional resistance (ESR) R1 50 k
Max. As per t able below
Motional capacitance C1 1.8 fF Ty p. 4.0 fF to 0.6 fF MC-306
2.0 fF Typ. MC-405 / 406
Shunt capacitance C0 0.9 pF Typ. 2.0 pF to 0.6 pF MC-306
0.85 pF Typ. MC-405 / 406
Frequency aging f_age 3 10-
6
/ year Max.
5
10-
6
/ year Max. +25 C, First year
Motional resistance
(
ESR
)
Frequency 20 kHzf_nom< 31.2 kHz 31.2 kHz
f_nom< 40 kHz 40 kHz
f_nom< 90 kHz 90 kHzf_nom
120 kHz
Motional resistance 55 k Max. 35 k
Max. 20 k
Max. 12 k
Max.
External dimensions
Unit:mm
.
Foot
p
rint
(
Recommended
)
(
Unit:mm
)
MC-306 MC-405 / 406
MC-306
The metal case inside of the molding compound may be exposed on the top or bottom of this product.
This purely cosmetic and does not have any effect on quality, reliability or electrical specs.
Do not connect #2 and #3 to external device.
Internal connection
(TOP VIEW)
#4
#1 #2
#3
1.9
(0.9)
(0.9)
5.5
0.5
2.54 Max.
2.38
8.0 Max.
#4
#1 #2
#3
3.8 Max.
3.2
32.768 k
E 571
Do not connect # 2 and #3 of MC- 406 to external device.
The first digit of No. means: 5×××× MC-405
6×××× MC-406
MC-405 / 406
#4
#1 #2
#3
#4
#1 #2
#3
Internal connection in MC-406
(TOP VIEW)
Internal connection in MC-405
(TOP VIEW)
0.2 Min.
3.6 Max.
3.15
2.54
2.54
4.06 Max.
#1
#4 #3
#2
10.41 Max.
9.60
32.768 k
E 6571A
0.51
0.51
2.29
MC-306 MC-405
1.52
0.8
4.1 3.9 4.1
1.52
4.1 3.9 4.1
4.1
MC-406
1.9 1.9
1.3
4.2
1.3 1.3
kHz RANGE CRYSTAL UNIT
SMD
MC - 306
MC - 405 / MC - 406
Frequency range : 32.768 kHz (20 kHz to 120 kHz)
Thickness : 8.0 × 3.8 × 2.54 mm ···MC-306
10.41 × 4.06 × 3.6 mm ···MC-405 / 406
Overtone order : Fundamental
Applications : Clock and Microcomputer
Product Number (please contact us)
MC-306 : Q1xMC3062xxxx00
MC-405 : Q1xMC4052xxxx00
MC-406 : Q1xMC4062xxxx00
PROMOTION OF ENVIRONMENTAL MANAGEMENT SYSTEM
CONFORMING TO INTERNATIONAL STANDARDS
At Seiko Epson, all environmental initiatives operate under the
Plan-Do-Check-Action (PDCA) cycle designed to achieve continuous
improvements. The environmental management system (EMS)
operates under the ISO 14001 environmental management standard.
All of our major manufacturing and non-manufacturing sites, in
Japan and overseas, completed the acquisition of ISO 14001
certification.
WORKING FOR HIGH QUALITY
In order provide high quality and reliable products and services
than meet customer needs,
Seiko Epson made early efforts towards obtaining ISO9000 series
certification and has acquired ISO9001 for all business
establishments in Japan and abroad. We have also acquired ISO/TS
16949 certification that is requested strongly by major automotive
manufacturers as standard.
►Explanation of the mark that are using it for the catalog
►Pb free.
►Complies with EU RoHS directive.
*About the products without the Pb-free mark.
Contains Pb in products exempted by EU RoHS directive.
(Contains Pb in sealing glass, high melting temperature type solder or other.)
►The products have been designed for high reliability applications such as Automotive.
Seiko Epson Corporation
Notice
• This material is subject to change without notice.
• Any part of this material may not be reproduced or duplicated in any form or any means without the written permission of Seiko Epson.
• The information about applied circuitry, software, usage, etc. written in this material is intended for reference only. Seiko Epson does
not assume any liability for the occurrence of infringing on any patent or copyright of a third party. This material does not authorize the
licensing for any patent or intellectual copyrights.
• When exporting the products or technology described in this material, you should comply with the applicable export control laws and
regulations and follow the procedures required by such laws and regulations.
• You are requested not to use the products (and any technical information furnished, if any) for the development and/or manufacture of
weapon of mass destruction or for other military purposes. You are also requested that you would not make the products available to
any third party who may use the products for such prohibited purposes.
• These products are intended for general use in electronic equipment. When using them in specific applications that require extremely
high reliability, such as the applications stated below, you must obtain permission from Seiko Epson in advance.
/ Space equipment (artificial satellites, rockets, etc.) / Transportation vehicles and related (automobiles, aircraft, trains,
vessels, etc.) / Medical instruments to sustain life / Submarine transmitters / Power stations and related / Fire work equipment
and security equipment / traffic control equipment / and others requiring equivalent reliability.
• All brands or product names mentioned herein are trademarks and/or registered trademarks of their respective.
ISO 14000 is an international standard for environmental
management that was established by the International
Standards Organization in 1996 against the background of
growing concern regarding global warming, destruction of
the ozone layer, and global deforestation.
ISO/TS16949 is the international standard that added the
sector-specific supplemental requirements for automotive
industry based on ISO9001.