SERIES BMA, SUBMINIATURE BLIND MATE CONNECTORS
DESCRIPTION
HUBER+SUHNER BMA blind mate connectors open up
special dimensions in microwave applications up to 18
GHz. HUBER+SUHNER offers a range of connectors for
fixed as well as “floating” configurations with any axial
or radial misalignment taken out by the outer contact of
the jacks.
The BMA series presents an outstanding range of prod-
ucts featuring high reliability and ease of assembly.
CONTENTS
PAGE
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Interface Dimensions . . . . . . . . . . . . . . . . . . . . . 165
Interface Dimensions in mm /
inches
. . . . . . . . . 165
Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . 166
BMA Connector Applications . . . . . . . . . . . . . . 168
Cable Connectors . . . . . . . . . . . . . . . . . . . . . . . . 171
Receptacles with Solder-in Hermetic Seal . . . . . . . 174
Receptacles with Solder End . . . . . . . . . . . . . . . . 175
PCB Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . 176
INTERFACE DIMENSIONS
INTERFACE DIMENSIONS (MM /
INCHES)
Plug
Jack
max.
min.
max.
Plug (male)
A
B
C
D
E
F
G
H
I
min.
4.88 /
.192 nom.
5.31/.209
5.35/.211
4.09 /
.161 nom.
----
5.71/.225
7.37/.290
3.05/.120
----
5.08/.200
----
----
3.23/.127
5.03/.198
7.62 /
.300 nom.
5.03/.198
3.25/.128
----
----
2.29 /
.090 nom.
0.90/.035
0.94/.037
1.78 /
.070 nom.
Interface dimensions conformable to
the Standards:
Jack (female)
USA:
MIL-STD-348A/321
COMPATIBILITY
The HUBER+SUHNER range of BMA connectors is fully
compatible with the OSP connector series.
IP rating (interface, mated) IP60
HUBER+SUHNER BMA
165
BMA
4.09 /
.161 nom
1.78 /
.070 nom.
TECHNICAL DATA
ELECTRICAL DATA
Cable type
Impedance
Frequency range
Dielectric withstanding voltage
(at sea level)
Insulation resistance
Contact resistance
- centre contact
- outer contact
VSWR (typical values)
- DC ... 18 GHz
RF-leakage interface only (fully mated)
RF-testing voltage (at sea level)
Admissible power (at sea level and
room temperature)
1) measured at interface with reference planes being in true alignment
REQUIREMENTS
.086” Semi-Rigid
50
DC ... 18 GHz
1.5 kV rms, 50 Hz
1.0 kV rms, 50 Hz
5
¡
10
3
M
2m
2m
(mated connector pair)
1.02 + 0.005 f (GHz)
90 dB - f (GHz)
1
1.0 kV rms, 5 MHz
670 V rms, 5 MHz
300 W at 3 GHz
(mated connector pair)
1.05 + 0.005 f (GHz)
.141” Semi-Rigid
MECHANICAL DATA
Engagement force
Disengagement force
Contact captivation
Cable retention force
1)
Durability (matings)
REQUIREMENTS
13.5 N
2N
27 N /
6.1 lbs
see pages 28 – 34
1000
1) Value considers maximum load of the cables without irreversible variations of specifications.
ENVIRONMENTAL DATA
Temperature range
Thermal shock
Moisture resistance
Corrosion
Vibration
Shock
TEST CONDITIONS
– 65 C ... + 125 C / –
85 F ... + 257 F
MIL-STD-202, Method 107, Condition B
MIL-STD-202, Method 106
Saltspray test acc. to MIL-STD-202, Method 101, Condition B
MIL-STD-202, Method 204, Condition D
MIL-STD-202, Method 213, Condition I
166
HUBER+SUHNER
BMA
MATERIAL DATA
CONNECTOR PARTS
Bodies
Pin contacts
Spring basket
Springs (floating connectors)
Insulators
Gaskets
MATERIAL
copper-beryllium alloy
stainless steel
copper-beryllium alloy
copper-beryllium alloy
stainless steel
PTFE or PFA
EPDM, 40 shore A
PLATING
gold
gold
gold
Some connectors may have a specification that differs from the above mentioned data.
The products are designed and guaranteed to pass the above mentioned test procedures. Any
additional or different requirement arising from specific applications or environmental conditions
which is not covered by these test procedures is subject to request.
HUBER+SUHNER
BMA
167
BMA
BMA CONNECTOR APPLICATIONS
Quick and reliable engagement and disengagement of
multiple microwave transmission lines, high packaging
density of flexible and rigid coaxial lines and cable free
connection of modules to motherboard are some needs
of modern microwave systems.
HUBER+SUHNER BMA connectors offer an economi-
cal solution for the most demanding interconnector ap-
plications found today in civil and military microwave cir-
cuits. To help ensure a problem free, reliable long term
operation the following guidelines should be used.
Assembly hints
Radial and axial misalignments can be accomodated
with the spring outer contacts of the
HUBER+SUHNER BMA connector.
These misalignments are due to the build up of toler-
ances with the major contributions coming from: Axial di-
rection, mounting plate distances and plate distortions.
Radial direction: mounting hole positions and concen-
tricity, plate distortion and misalignment.
For recommended mounting hole sizes see page 412.
Rigid mounting
Maximum misalignment
Axial: 0.38 mm /
.015 in.
*
Radial: 0.20 mm /
.008 in.
* For applications with reduced return loss specifications
0.76 mm /
.030 in.
is allowable.
Hole dimensions
To avoid tolerances build up all mounting holes must be toler-
anced from a single datum point.
It is also important that both of the mounting plates are prop-
erly afficed and correctly positioned.
168
HUBER+SUHNER
BMA
Float mounting
The increased tolerance correction of the connector is achieved
by using an extra spring system.
This allows the centre assembly of the connector to move freely
within the flange body.
Recommended maximum tolerances:
Axial: 1.52 mm /
.060 in.
Radial: 0.51 mm /
.020 in.
F
25 N
20 N
15 N
10 N
5N
0
Spring Load Force
9.25 9.5 9.75 10 10.25 10.5 10.75 mm
.346 .374 .384 .394 .404 .413 .423 in.
To ensure optimum contact under extreme radial misalignment the following points must be considered:
A:
The maximum misalignment tolerances must not be ex-
ceeded. Any possible bending of the mounting plate due
to the spring preloading of the individual connectors
must be taken into account.
If distortion occurs the following steps should be taken to
minimize the effect:
– re-dimensioning
– bracing of the mounting plate
– reduction of maximum connector preloading force
which will result in the limitation of length L.
B:
A minimum preloading force of 16 N must be ensured for
each connector pair so that the maximum engaging
force will be exceeded. This represents the upper limit of
separation. For the example above this is a length L of
maximum 10.65 mm /
.419 in.
Data on other connector combinations available on re-
quest.
For the dimensioning of the holes the same points must
be considered as for the rigid mounting.
HUBER+SUHNER
BMA
169
BMA
The dj
Th adjacent di
t diagram shows the relationship between th con-
h
th l ti hi b t
the
nector preloading force and the separation distance “L” be-
tween the mounting reference planes for a typical connector
pair (25_BMA-50-3-2 and
14 BMA-50-3-2).
14_BMA-50-3-2).
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