SERIES BMA
SUBMINIATURE BLIND MATE CONNECTORS
Description
SUHNER BMA blind mate connectors open up spe-
cial dimensions in microwave applications up to
22 GHz. 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
products featuring high reliability and ease of as-
sembly.
Interface dimensions
Plug (male)
Interface Dimensions in mm /
inches
Plug
min.
A
B
C
D
E
F
G
H
I
max.
min.
4.09 /
.161 nom
4.88 /
.192 nom.
5.31/.209
5.03/.198
3.25/.128
0.90/.035
5.35/.211
----
----
.094/.037
7.62 /
.300 nom.
Jack
max.
1.78 /
.070 nom.
4.09 /
.161 nom.
----
5.71/.225
7.37/.290
3.05/.120
----
5.08/.200
----
----
3.23/.127
5.03/.198
2.29 /
.090 nom.
1.78 /
.070 nom.
Interface dimensions conformable to
the Standards:
Jack (female)
USA:
MIL-STD-348A/321
Compatibility
The SUHNER range of BMA connectors is fully
compatible with the OSP connector series.
SUHNER
â
BMA
Technical Data
ELECTRICAL DATA
Cable type
Impedance
Frequency range
VSWR (typical values)
- DC ... 18 GHz
- 18 ... 22 GHz
RF-leakage (fully mated)
Dielectric withstanding voltage
(at sea level)
RF-testing voltage (at sea level)
Insulation resistance
Contact resistance
- centre contact
- outer contact
Admissible power (at sea level and
room temperature)
1) measured at interface with reference planes being in true alignment.
REQUIREMENTS
RG 402/U
RG 405/U
50
Ω
DC ...
18
GHz
(mated connector pair)
≤
1.02 + 0.005 f (GHz)
≤
1.02 + 0.008 f (GHz)
(mated connector pair)
≤
1.05 + 0.005 f (GHz)
≤
1.05 + 0.009 f (GHz)
≥
90 dB - f (GHz)
1)
1.5 kV rms, 50 Hz
1.0 kV rms, 5 MHz
1.0 kV rms, 50 Hz
670 V rms, 5 MHz
≥
5
⋅
10
3
MΩ
≤
2 mΩ
≤
2 mΩ
≤
300 W at 3 GHz
MECHANICAL DATA
Engagement force
Disengagement force
Contact captivation
Durability (matings)
REQUIREMENTS
≤
13.5 N
≥
2N
≥
27 N
≥
1000
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
SUHNER
â
BMA
MATERIAL DATA
CONNECTOR PART
Bodies
Centre contacts
Spring basket
Springs
(floating connectors)
Insulators
Gaskets
STANDARDS
QQ-C-530
QQ-S-763
QQ-C-530
QQ-C-530
MATERIAL
beryllium-copper, hardened
stainless steel
beryllium-copper, hardened
beryllium-copper
stainless steel
PTFE or PFA
EPDM, 40 shore A
PLATING
gold
gold
gold
passivated
Some connectors may have a specification that differs from the above mentioned data.
SUHNER
â
BMA
BMA Connector Applications
Quick and reliable engagement and disengage-
ment of multiple microwave transmission lines,
high packaging density of flexible and rigid coax-
ial lines and cable free connection of modules to
motherboard are some needs of modern micro-
wave systems.
SUHNER BMA connectors offer an economical
solution for the most demanding interconnector
applications found today in civil and military mi-
crowave circuits.
To help ensure a problem free, reliable long term
operation the following guidelines should be used.
Assembly hints
Radial and axial misalignments can be accomo-
dated with the spring outer contacts of the
SUHNER BMA connector.
These misalignments are due to the build up of tol-
erances with the major contributions coming from:
Axial direction: mounting plate distances and
plate distortions.
Radial direction: mounting hole positions and con-
centricity, plate distortion and misalignment.
Rigid Mounting
Maximum misalignment
Axial: 0.38 mm /
.015 in.
*
Radial: 0.20 mm /
.008 in.
* For applications with reduced specifications
0.76 mm /
.030 in.
is allowable.
Hole Dimensions
To avoid tolerances build up all mounting holes must be
toleranced from a single datum point.
It is also important that both of the mounting plates are
properly afficed and correctly positioned.
SUHNER
â
BMA
Floating Assembly
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
The dj
Th adjacent di
t diagram shows th relationship b t
h
the l ti hi between
the connector preloading force and the separation dis-
tance “L” between the mounting reference planes for a
typical connector pair (25 BMA-50-3-2 and
14 BMA-50-3-2).
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
exceeded. 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 en-
sured 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 request.
For the dimensioning of the holes the same points
must be considered as for the rigid assembly.
SUHNER
â
BMA
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