Actual size
Crystal unit
Specifications (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 / °C2 Max.
Load capacitance
CL
6 pF to (standard :12.5 pF)
Please specify
Motional resistance (ESR)
R1
50 k Max.
As per table below
Motional capacitance
C1
1.8 fF Typ.
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 kHzf_nom< 40 kHz
40 kHzf_nom< 90 kHz
90 kHzf_nom120 kHz
Motional resistance
55 k Max.
35 k Max.
20 k Max.
12 k Max.
Product name MC-306 32.768000kHz 12.5 +20.0-20.0
(Standard form) ① ② ③ ④
①Model ②Frequency ③Load capacitance(pF) ④Frequency tolerance(× 10-6, +25 C)
External dimensions (Unit:mm)
.
Footprint (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
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
