A
ctual size
http://www.epsontoyocom.co.jp
Crystal unit
12
S
p
ecifications
(
characteristics
)
Item Symbol Specifications Remarks
Nominal frequency range f 32.768 kHz 20 kHz to 165 kHz
307.2 kHz(MC-405 / 406) Please contact us regarding available frequencies
Storage temperature T_stg -55 °C to +125 °C Stored as bare product after unpacking Temperature
range Operating temperature T_use -40 °C to +85 °C
Level of drive DL 1.0 µW Max.
Frequency tolerance (standard) f_tol ±20 × 10-6, ±50 × 10-6 ±50 × 10-6, ±100 × 10-6 +25 °C, DL=0.1 µW
Turnover temperature Ti +25 °C ±5 °C
Parabolic coefficient B -0.04 × 10-6 / °C2 Max.
Load capacitance CL 6 pF to ∞ (standard :12.5 pF) Please specify
Motional resistance (ESR) R1 50 kΩ Max. 55 kΩ to 6 kΩ As per below table
1.8 fF Typ. MC-306
Motional capacitance C1 2.0 fF Typ. 4.0 fF to 0.6 fF MC-405 / 406
0.9 pF Typ. MC-306
Shunt capacitance C0 0.85 pF Typ. 2.0 pF to 0.6 pF 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 kHz≤f< 31.2 kHz 31.2 kHz≤f< 40 kHz 40 kHz≤f< 90 kHz 90 kHz≤f< 130 kHz 130 kHz≤f≤165 kHz 307.2 kHz
Motional resistance 55 kΩ Max. 35 kΩ Max. 20 kΩ Max. 12 kΩ Max. 10 kΩ Max. 6 kΩ Max.
External dimensions
(
Unit:mm
)
.
Foot
p
rint
(
Recommended
)
(
Unit:mm
)
MC-306 MC-405 / 406
MC-306
Metal may be exposed on the top or bottom of this product.
This will not affect any quality, reliability or electrical spec.
Do not connect #2 and #3 to external device.
Internal connection
#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
Internal connection in MC-405
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 / 405 / 406
•Frequency range : 32.768 kHz (20 kHz to 165 kHz)
•Thickness : 2.54 mm Max.(MC-306)
3.60 mm Max.(MC-405 / 406)
•Overtone order : Fundamental /Overtone (307.2 kHz)
•Applications : Clock and Microcomputer
•Lead(Pb)-free : High melting temperature type solder
(Pb85 %) exempted by RoHS directive.
