C-Press
121 Series
®
Coaxial— Snap On & Screw On Types
/
50 Ohm & 75 Ohm
These 50 and 75 Ohm coaxial connectors are
easily inserted into your printed circuit board
using an insertion tool. Solder is eliminated and
a dependable press-fit connection is made.
Note
Types:
SMB = Snap On
SMC = Screw On
SPECIFICATIONS
Material:
Body — Brass per QQ-B-
620 half hard insulator —
Teflon per MIL-P-19468
Center contacts mating area
shall be gold plated to a
minimum thickness of
0.00003 inch in accordance
with MIL-G-45204 Type II
Grade C. All other metal
parts shall be finished to
provide a connector which
meets the corrosion
requirements as called out in
this specification.
Insertion Loss:
50 Ohms
(dB Max.):
SMB:
SMC:
75 Ohms
(dB Max.):
SMB & SMC:
Mating
Characteristics:
Finish:
@ 1.5 GHz .30
@ 4.0 GHz .25
@ 1.5 GHz .30
Interface design per MIL-C-
39012 and interchangeable
with other manufacturers.
The connector to be tested
and its mating connector
shall be subjected to 500
insertion and withdrawal
cycles at 12 cycles per
minute. The connector shall
show no evidence of
mechanical failure and the
connector shall meet the
mating characteristic
requirements.
Electrical:
50 Ohms:
Impedance:
Frequency:
Insulation
Resistance:
75 Ohms:
Impedance:
Frequency:
Insulation
Resistance:
Dielectric
Withstanding
Voltage:
50 Ohms:
Connector
Durability:
50 Ohms nominal
0 to 4 GHz
1,000 Megohms (min.)
75 Ohms nominal
0 to 2 GHz
1,000 Megohms (min.)
Environmental
Vibration:
SMB:
SMC:
Shock:
SMB:
SMC:
Corrosion
(salt spray):
From dc to 4 GHz, the
VSWR shall not exceed 1.3
& .04 (f) where f is the
frequency in Gigahertz
(GHz).
From dc to 10 GHz the
VSWR shall not exceed 1.25
& .04 (f) where f is the
frequency in Gigahertz
(GHz).
Corona Level:
75 Ohms:
The magnitude of the test
voltage shall be 1,000 volts
rms at sea level.
The magnitude of the test
voltage shall be 2,000 volts
rms at sea level.
Specification MIL-STD-202,
method 204, test condition B
Specification MIL-STD-202,
method 204, test condition D
Specification MIL-STD-202,
method 213, test condition B
Specification MIL-STD-202,
method 213, test condition C
Specification MIL-STD-202,
method 101, test condition B
The connector shall not
exhibit breakdown (corona)
when 190 volts rms is
applied and the altitude is
70,000 feet.
The center contact resis-
tance drop shall not exceed
2.5 milliohms and the outer
contact resistance drop shall
not exceed 2.0 milliohms.
Voltage
Standing
Wave Ratio
(VSWR):
SMB:
SMC:
Contact
Resistance:
Winchester Electronics
400 Park Road
■
R.F. Leakage
(dB) Min. @ 2 to
3 GHz:
SMC:
60
SMB:
55
■
Watertown, Connecticut 06795-0500
Phone: (860) 945-5000
■
FAX: (860) 945-5191
■
Internet: http://www.litton-wed.com
CP /
34
C-Press
121 Series
OUTLINE
®
Coaxial-Snap on & Screw on Types 50 Ohm & 75 Ohm
50 Ohm
Screw On Type — SMC
.350
8.89
.020 ± .001
0.51 ± 0.03
.145 ± .001
3.68 ± 0.03
.145
3.68
.084 ± .002
2.13 ± 0.05
.240
6.09
.128
3.25
.194
4.93
Min. THD.
.180 ± .015
4.57 ± 0.38
50 Ohm
Snap On Type — SMB
.180
4.57
.084
2.13
.047
1.19
.020
0.51
.240
6.09
.044
1.12
.136
3.45
.087
2.20
C
L
.350
8.89
Groove
#10-32 UNF-2A
75 Ohm
Screw On Type — SMC
.240
6.10
.128
3.25
.020 ± .001
0.51 ± 0.03
.360
9.14
.180 ± .015
4.57 ± 0.38
75 Ohm
Snap On Type — SMB
.360
9.14
.240
6.10 .136
3.45
.180 Ref.
4.57
.244
6.20
.054
1.37
.244 ± .001
6.20 ± 0.03
.134 ± .002
3.40 ± 0.05
.50
12.7
.134
3.40
.047
1.19
.020
0.51
.054 ± .015
1.37 ± 0.38
.28
7.1
.400 Ref.
10.16
5/16-32 UNF-2A THD.
BACKPANEL REQUIREMENTS
Hole pattern
.100
2.54
.200
5.08
Hole Size & Plating -
Standard
C-Press
®
:
Winchester illustration on page CP/4.
Consult Winchester Electronics for
C-Press
®
applications for backpanels less than .093" thick and for
bare copper plated through holes.
NOTE:
.200
5.08
X
.100
2.54
.040 ± .003
1.02 ± 0.08
(5Holes)
Finished hole size
X Y
Y
.004 (0.10 Dia.)
ORDERING INFORMATION
Connector Type
50 Ohm
75 Ohm
Screw on Type
121-27341-1 Without CAP
121-27341-2 With CAP
121-10349-1 With CAP
121-10349-2 Without CAP
Snap on Type
121-10302-1 With CAP
121-10302-2 Without CAP
121-14165-1 With CAP
121-14165-2 Without CAP
®
Recognized under the Component Program of Underwriters Laboratories Inc. File No. E136181, to Standard UL 1863
Winchester Electronics
400 Park Road
■
Watertown, Connecticut 06795-0500
■
Phone: (860) 945-5000
■
FAX: (860) 945-5191
■
Internet: http://www.litton-wed.com
CP /
35
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