Microminiature Connectors
MDMH connectors are ideal for applications
requiring a better seal than can be achieved
with epoxy resins.
The connector utilizes size 24 AWG contacts
that are compression glass sealed through a
steel shell and into a diallyl pthalate front end
insulator. An interfacial seal provides
environmental protection when mated. We
recommend MDMH receptacles be soldered
to the chassis or container for a completely
leak-proof joint.
MDMH receptacles mate with standard MDM
plugs.
Hermetic-MDMH
Features
• Hermetically sealed connector designed for
those applications where a vacuum, inert
gas or a constant controlled pressure are
required to eliminate adverse effects creat-
ed by atmospheric changes.
• Steel shells to provide greater strength, pre-
vent chipping, cracking or breaking, offer
electro-magnetic (EMI) and RFI shielding.
• Silicone elastomer compression interfacial
seal to provide a moisture and humidity
seal between each contact and between
contacts and shell.
Specifications
Standard materials & finishes
Shell
Insulator
Contacts
Hermetic seal
Leak rate
ELECTRICAL DATA
No. of contacts
Dielectric withstanding voltage
Insulation resistance
Wire size
Contact termination
MECHANICAL FEATURES
Size or length
Service class
Coupling
Polarization
Contact spacing
Shell style
Mild steel, tin-lead plated
Glass filled diallyl phthalate per MIL-M-14. Type SDGF
Copper alloy, gold plated sockets on mild steel gold plated pins. Solder pots - mild steel gold plated
Compression glass
1 micron cubic ft/hr max (1.04 x 10-5 cc/sec at 1 ATM pressure differential)
9 to 100
150 VAC
5000 Mohm minimum
#26 through #30 AWG
Solder pot
8 sizes
Hermetically sealed
Friction/jacks
Keystone shaped shells
.050 (1,27) centers
Receptacle, solder mount
How to Order
MDMH – 51
Hermetic Micro D Receptacle Series
Contact layout
9, 15, 21, 25, 31, 37, 51, 100
S
S
Socket Contacts (only)
Termination type
Dimensions shown in inch (mm)
Specifications and dimensions subject to change
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23
Microminiature Connectors
Contact Arrangements
Face vew of socket insert - use reverse order for wiring side.
5
4
3
2
1
8
7
6
5
4
3
2
1
11
10 9
8
7
6
5
4
3
2
1
Hermetic-MDMH
13 12 11 10 9
8
7
6
5
4
3
2
1
9
8
7
6
15 14 13 12 11 10
9
21 20 19 18 17 16 15 14 13 12
25
24 23 22 21 20 19 18 17 16 15 14
9 Contacts
15 Contacts
21 Contacts
25 Contacts
4
3
2
1
18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20
51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36
31 Contacts
1
2
3
4
5
6
7
8
37 Contacts
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
46 47 48 49 50 51
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
51 Contacts
52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
100 Contacts
Contact identification numbers are for reference only and do not appear on insulator or connector body.
Shell Dimensions
6,61
(.260)
MAX
A
B
F
4,58
(.180)
MAX
D
G
E
2 HOLES
2-56 UNC (9-51 WAY)
4-40 UNC (100 WAY)
5,06 (.199) MAX
1,93
(.076)
MAX
C
Part Number
by shell size
MDMH-9S
MDMH-15S
MDMH-21S
MDMH-25S
MDMH-31S
MDMH-37S
MDMH-51S
MDMH-100S
A
max
.885 (22,48)
1.035 (26,29)
1.185 (30,10)
1.285 (32,64)
1.435 (36,45)
1.585 (40,26)
1.535 (38,99)
2.275 (57,78)
B
max
.738 (18,74)
.888 (22,55)
1.038 (26,36)
1.137 (28,87)
1.288 (32,72)
1.438 (36,53)
1.388 (35,26)
2.078 (52,78)
C
max
.400 (10,16)
.550 (13,97)
.770 (17,78)
.800 (20,32)
.950 (24,13)
1.100 (27,94)
1.050 (26,67)
1.455 (36,97)
D
max
.270 (6,86)
.270 (6,86)
.270 (6,86)
.270 (6,86)
.270 (6,86
.270 (6,86)
.310 (8,00)
.365 (9,27)
E
max
.430 (10,92)
.430 (10,92)
.430 (10,92)
.430 (10,92)
.430 (10,92)
.430 (10,92)
.473 (12,01)
.522 (13,26)
F
±.005 (0,13)
.565 (14,35)
.715 (18,16)
.865 (21,97)
.965 (24,51)
1.115 (28,32)
1.265 (32,13)
1.215 (30,86)
1.800 (45,72)
G
max
.261 (6,63)
.261 (6,63)
.261 (6,63)
.261 (6,63)
.261 (6,63)
.261 (6,63)
.315 (8,00)
.410 (10,41)
Dimensions shown in inch (mm)
Specifications and dimensions subject to change
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24
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