1
MD CONNECTOR
Miniature circular connectors
―10
―20
―30
―40
―50
―60
―70
―80
―90
―100
―11030 100 300 600
Shielding effect(dB)
Frequency(MHz)
MD connector(with ground clip)
Braided wires soldered to the metal shell
Layout
Circuits Mating section layout PC board layout (viewed from component side)
Standard and Type B Front shielding type
4
5
6
2
4
1
3
3
5
2
4
1
4
6
3
5
12
φ0.9
＋0.1
0
8.5max.
4
2
3
1
3±0.05
6.8±0.1
φ2.2±0.1
13.5±0.1 
Hole dimensions (from the front)
2.5±0.05
Socket mating
side surface
φ0.9
＋0.1
0
8.5 max.
4
2
3
1
Note
0.8±0.1
6.8±0.1
2.5±0.05
2.4±0.1
13.5±0.1
0.8±0.1
2.2±0.1
3±0.05
3.8±0.05
Socket mating
side surface
φ0.9
＋0.1
0
8.5max.
5
3
4
2
Note
0.8±0.1
6.8±0.1
2.5±0.05
2.4±0.1
13.5±0.1
0.8±0.1
2.2±0.1
3±0.05
3.8±0.05
1.3
±0.05
1
Socket mating
side surface
φ0.9
＋0.1
0
8.5max.
5
3
4
2
1
6.8±0.1
1.3±0.05
2.5±0.05
3±0.05
φ2.2±0.1
13.5±0.1 
Hole dimensions (from the front)
Socket mating
side surface
φ0.9
＋0.1
0
8.5max.
6
4
5
3
12
Note
6.8±0.1
2.6
±0.05
2.4±0.1
0.8±0.1
2.5±0.05
3±0.05
2.2±0.1
0.8±0.1
3.8±0.05
13.5±0.1 Socket mating
side surface
φ0.9
＋0.1
0
8.5max.
6
4
5
3
12
6.8±0.1
φ2.2±0.1
2.5±0.05
3±0.05
2.6±0.05
13.5±0.1 
Hole dimensions (from the front)
Socket mating
side surface
Standards ––––––––––––––––––––––
0Recognized E60389
1Certified LR20812
Shielding effect
•The shielding effect differs depending on the wire specifications.
*Refer to "General Instruction and Notice when using
Terminals and Connectors" at the end of this catalog.
* Contact JST for details.
* Compliant with RoHS
The extremely compact MD miniature circular
connector has an outside diameter roughly half
that of conventional circular DIN connectors.
The connector's contact exclusively designed
by JST dramatically reduces assembly time
while improving contact reliability. The MD
connector's shielding is superb. All you need
to do is crimp the connector ground clip over
the cable's braided shielding wire. Simple and
reliable, JST's MD connector is well suited for
the production of high-density office
automation equipments as well as audio and
video products.
• Crimp contact with integral construction for
improved reliability
• Easy assembly without using special tools
• Simple braid-to-connector assembly and
effective EMI protection
PC board layout
2
MD CONNECTOR
Layout
Circuits
Mating section
layout
PC board layout (viewed from component side)
Standard and Type B Front shielding type
7
8
9
4
7
3
5
12
6
5
8
3
6
12
7
4
5
8
3
6
12
7
4
φ0.9
＋0.1
0
8.5max.
7
4
5
3
12
6
Note
6.8±0.1
2.6±0.05
0.9±0.05
2.4±0.1
13.5±0.1
0.8±0.1
2.5±0.05
3±0.05
2.2±0.1
3.8±0.05
0.8±0.1
Socket mating
side surface
φ0.9
＋0.1
0
8.5max.
8
5
6
3
12
7 4
6.8±0.1
0.9±0.05
2.6±0.05
φ2.2±0.1
13.5±0.1 
Hole dimensions (from the front)
2.5
±0.05
3±0.05
Socket mating
side surface
φ0.9
＋0.1
0
8.5max.
8
5
6
3
12
7 4
Note
6.8±0.1
2.6±0.05
0.9±0.05
2.4±0.1
0.8±0.1
2.5±0.05
3±0.05
2.2±0.1
3.8±0.05
0.8±0.1
13.5±0.1
Socket mating
side surface
(Type B)
6
9
3
7
12
8
45
Note: 1. The two holes are necessary when installing a shielding cover.
2. Tolerances are non-cumulative:
±
0.05 mm for all centers.
3. Hole dimensions differ depending on the type of PC board and piercing method. The dimensions above should serve as a guideline.
For details, contact JST.
4. The layout drawing is viewed from the socket mounting side.
5. When using a socket with shielding cover or with flange shielding cover, the pattern should be designed to connect the shielding cover and the shielding
tube, if necessary. (No need for the front shielding cover.)
3
Plug
Socket
Straight type Side entry type
Standard type
Type B
With shielding cover
Standard type
Type B
With flange shielding
cover
Front shielding type
13.2 20
15.6
12.8
8.5
12.5 20
15.6
19.4
8.5
MD CONNECTOR
Assembly layout
4
3.9 1.71.1
13
φ0.6
Model No. Applicable wire
Silver-plated Tin-plated mm2AWG #
Insulation
O.D. (mm)
Gold-plated
(flash)Q´ty/
reel
MD-SP2240
MD-SP1240
MD-SP2270
MD-SP1270
MD-SP2290
MD-SP1290
0.06〜0.13
0.13〜0.2
30〜26
26〜24
0.7〜1.1
1.0〜1.2
10,000
10,000
• Series name
• Product form: S ... Chain, B ... Loose piece
• Type of contact: P ... Plug contact
• Applicable wire: 1 ... AWG #26 〜 #24, 2 ... AWG #30 〜 #26
• Material: 2 ... Phosphor bronze
• Finish: 40 ... Gold-plated (flash)
44 ... 0.76 micron gold-plated
45 ... 1.3 micron gold-plated
70 ... Silver-plated
90 ... Tin-plated (reflow treatment)
MD SP2240-
Plug contact
RoHS compliance Gold-plated products display (LF)(SN) on a label.
Model number identification
*Contact JST for details.
Part name Material and Finish
Phosphor bronze, nickel-undercoated,
Mating part; gold-plated
Crimping part; tin-plated (reflow treatment)
Phosphor bronze, tin-plated (reflow treatment)
Phosphor bronze, nickel-undercoated silver-plated
Housing A, B
Metal shell
Ground clip
Contact
PBT, UL94V-0, black
Steel, nickel-plated
Brass, nickel-plated
1.0 A AC, DC (AWG #26)
50 V AC, DC
500 VAC/minute
AWG #30〜#24
Initial value/ 100 mΩ max.
After environmental tests/ 300 mΩ max.
-25˚C 〜 +85˚C(including temperature rise in applying electrical current)
50 MΩ min.
Current rating
Voltage rating
Temperature range
Contact resistance
Insulation resistance
Withstanding voltage
Applicable wire
Contact
JST's exclusive one-piece contact is
formed and cold worked by stamping
presses to ensure the highest reliability.
Housing B
Ground clip
If used, the ground
clip is crimped to
cover the cable
braid.
Housing A
Housing A is designed to keep the
contacts firmly in place while
protecting them from damage.
Metal Shell
Three shell types
(standard, A and B)
are available.
Solder tail
MD CONNECTOR
Assembled product Molded product
Contact
Metal Shell
One piece including
ground clip
Housing B
Housing A
Plug
Straight type plug Side entry type plug
Specifications–––––––––––––––––––––––––––––––––––––––––––––––––––––
Characteristics
Materials
Molded productAssembled product
5
MD CONNECTOR
Housing A
Housing B
Housing B Housing A
Combined housings A and B
Q´ty/box
Circuits Model No.
Housing A Housing B
MD-PI 4A
−
MD-PI 6A
MD-PI 8A
MD-PI 9A
1,000
1,000
1,000
1,000
1,000
4
5
6
8
9
MD-PI 4B
MD-PI 5B
MD-PI 6B
MD-PI 8B
MD-PI 9B
φ8.15
0.4
22
0.4
2
2.5 2.5
11 8.4
6.1
2
φ9.15
0.4
2.62.7
0.7
2
3.1 3.1
8.4
6.1
2
1.10.9 11
JST
φ8.15
2
1.2
2.5 2.5
22
1.60.4
4.6 1
JST
φ8.15
2
2.5 2.5
22
0.4
4.6 1
1
2
JST
φ8.15
2
22
20.4
4.6 1
2.52.5 11
JST
φ8.15
2
2.5 2.5
22
0.4
1
2
0.4
11
JST
1
φ9.15
2
3.1 3.1
0.4 2
2.62.7
0.7
0.9 1.1
11
Housing
<With 4 to 8 circuits> <With 9 circuits>
<With 4 circuits> <With 5 circuits> <With 6 circuits>
<With 8 circuits> <With 9 circuits>
Housing A is used with housing B. Housing B must have the
same number of orifices as there will be contacts in the connector.
However, housing A can have a greater number of cavities (but
never less). Thus in applications in which a user may require MD
connectors with different pin counts, only one kind of "A" housing
needs to be inventoried - the one with the highest pin count.
For more details regarding such combinations, contact JST.
RoHS compliance
Note: MD-PI5B is not CSA certified.
6
100°
Solder tail
3.4
21.6
25
φ9.05
3.421.6
25
φ9.95
100°
Solder tail
Model No. Q´ty/box
Circuits Standard Type A (features three polarizing keys)
Type B (features 4 polarizing keys...8 circuits only)
With solder tail Without solder tail With solder tail Without solder tail With solder tail Without solder tail
MD-PS8T
MD-PS9T
750
750
4〜8
9
*MD-PS8T1
*MD-PS9T1
*MD-PS8AT
−
*MD-PS8AT1
−
*MD-PS8BT
−
*MD-PS8BT1
−
100° 3.421.6
25
φ9.05
Solder tail
100° 3.421.6
25
φ9.05
Solder tail
5
9.4
3.3
Q´ty/reel
Circuits Model No.
Applicable cable O.D. (mm)
MD-PCC8T-S1
MD-PCC8T-S2
MD-PCC9T-S3
4〜8
9
2.7〜3.8
4.3〜5.5
3.6〜4.8
1,000
1,000
1,000
Metal shell (straight type)
<With 9 circuits><With 4 to 8 circuits>
Standard type
Type A Type B
<features polarizing keys, usable with S-VHS connector> <features 4 polarizing keys, usable with having 8 circuits>
RoHS compliance
*Marked products are not CSA certified.
Ground clip
RoHS compliance
MD CONNECTOR
7
MD CONNECTOR
100°
φ9.05
15°
39.7
21
Q´ty/box
Circuits Model number
Type LR
MD-PS8SR
MD-PS8ASR
MD-PS8BSR
Standard
A
B
500
500
500
4〜8
4〜8
8
MD-PS8SL
−
−
100°
φ9.05
15°
39.7
21
100°
φ9.05
15°
39.7
21
50°
Socket
Plug
Wiring direction RL
Metal shell (side entry type)
Standard type
Type A Type B
<features polarizing keys, usable with S-VHS connector> <features 4 polarizing keys, usable with housing having 8 circuits>
Viewing from the socket mounting side
RoHS compliance
Crimp applicator
Applicator
Dies
Crimp applicator with dies Crimp applicator
Applicator
Dies
Crimp applicator with dies
Crimping
machine Crimping
machine
Note: *Strip-crimp applicator
Contact
MD-PCC8T-S1
MD-PCC8T-S2
MD-PCC8T-S3
MD-PS8SL
MD-PS8ASR
AP-K2N
MKS-L
*MKS-SC
MKS-L
*MKS-SC
MK/MD-PCC8T-S1
–
MK/MD-PCC8T-S2
–
MKS-L
*MKS-SC
MK/MD-PCC8T-S3
–
MKS-L-RG
*MKS-SC MK/MD-PS8SR
–
MKS-L-RG
*MKS-SC MK/MD-PS8SR
–
APLMK MD-PCC8T-S1
–
APLMK MD-PCC8T-S2
APLMK MD-PCC8T-S3
–
–
APLMK MD-PS8SR
–
APLMK MD-PS8SR
–
Contact
MD-PS8BSR
MD-PS8SR
MD-SP12**
MD-SP22**
AP-K2N
MKS-L-RG
*MKS-SC
MKS-L-RG
*MKS-SC
MK/MD-PS8SR
–
MK/MD-PS8SR
–
MKS-L
*MKS-SC MK/MD-SP12
SC/MD-SP12
MKS-L
*MKS-SC MK/MD-SP22
SC/MD-SP22
APLMK MD-PS8SR
–
APLMK MD-PS8SR
APLMK MD-SP12
–
APLSC MD-SP12
APLMK MD-SP22
APLSC MD-SP22
Crimping machine, Applicator
8
• Split round contact provides maximum contact
area and contact redundancy
The socket contact is split to insure redundant connection and is
cylindrically shaped to provide maximum contact mating area.
The result is a highly reliable connection to the mating pin.
This superb contact performance is maintained even after many
mating and unmating cycles.
• Flange construction
The flange construction allows the
socket to be secured on the
equipment chassis with screws,
ensuring more reliable electrical
connection.
Shielding cover
Housing
Holder
Shielding tube
A spring lock
temporarily secures
the socket to the
printed circuit board.
Contact
The socket is a split
round contact that at once
provides maximum contact area
and contact redundancy.
• Series name
• Product name: S ... Socket
• Circuits: 4, 5, 6, 7, 8, 9
• Shielding cover: 0 ... Without shielding cover
1 ... With shielding cover
3 ... With front shielding cover
• Flange: 00 ... Without flange
30 ... With flange
50 ... With top flange with nuts
• Type B indication
B ... Type B (Applicable to Type B plug)
Blank...Standard type (Applicable to Standard and Type A plugs)
...Front shielding type (Applicable to Standard and Type plugs)
• Finish: 10 ... Gold-plated (flash)
13 ... 0.4 micron gold-plated
14 ... 0.76 micron gold-plated
70 ... Silver-plated
90 ... Tin-plated (reflow treatment)
-
MD S 8 0 00B10
-
Part name Material and Finish
Phosphor bronze, nickel-undercoated,
Mating part; gold-plated
Solder tail; tin-plated (reflow treatment)
Phosphor bronze, nickel-undercoated silver-plated
Phosphor bronze, tin-plated (reflow treatment)
Contact
Housing / Holder PBT, UL94V-0
1.0 A AC, DC
50 V AC, DC
500 VAC/minute
1.6 mm
Initial value/ 100 mΩ max.
After environmental tests/ 300 mΩ max.
-25˚C 〜 +85˚C(including temperature rise in applying electrical current)
Current rating
Voltage rating
Temperature range
Contact resistance
Withstanding voltage
Applicable PC board thickness
Shielding tube
Shielding cover
Brass, nickel-plated (*note)
Brass, nickel-undercoatd, tin/copper alloy-plated
Shielding cover Brass, nickel-plated (*note)
Socket (through-hole type)
Standard type with flange shielding cover
(Standard type/Type B)
• Compact, high-density design
This socket has a low profile with a mounting height of just
12.8 mm and width of 14 mm. It takes up little space on the
printed circuit board, allowing high-density product design.
• Spring locks make it easy to temporarily secure
sockets to printed circuit boards for soldering
The shielding tubes
are equipped with
spring locks which can
be used to temporarily
secure the sockets to
printed circuit boards.
This prevents the
sockets from moving
and ensures reliable
soldering.
(Front shielding type)
• Front shielding construction
A metal shielding cover integrating the connection part which
connects to the plug's shell is used. Because there is no gap
between the socket and the plug, this construction prevents the
entry of space conductive noise.
• Effective shielding
With the front shielding construction
and the flange construction, the
shielding effect is improved by
about 15 dB over the conventional
models.
Standard type without shielding cover (left)
Standard type with shielding cover (center)
Type B (applicable to Type B plug) (right)
Front shielding type socket
Specifications–––––––––––––––––––––––––––––––––––––––––––––––––––––
Model number identification
Materials
Characteristics
Note: Use soldering flux that is suitable for nickel-plating.
Tin plated version is also available. Note: Contact JST for special plating requirements.
[Standard type/Type B]
[Front shielding Type]
MD CONNECTOR
9
MD CONNECTOR
Standard type / Type B
12
43
14
13.5
12.8
(3.5)
6.8
6.5
13.5
6.8
12.8
(3.4) 6.5
19.5
9.5
7
12.5
1.5
4.7
8.5
0.6
2.5
1.5 13
4.7
8.5 2.5 8.5 2.5
13.2
(2)
M3
4.7
Q´ty/
box
Cir-
cuits Model No.
Gold-plated(flash)socket
Silver-plated socket Tin-plated socket
MD-S4000-10
MD-S5000-10
MD-S6000-10
MD-S7000-10
MD-S8000-10
MD-S9000-10
4
5
6
7
8
9
200
200
200
200
200
200
MD-S4000-70
MD-S5000-70
MD-S6000-70
MD-S7000-70
MD-S8000-70
MD-S9000-70
MD-S4000-90
MD-S5000-90
MD-S6000-90
MD-S7000-90
MD-S8000-90
MD-S9000-90
With flange
shielding cover
Without shielding cover
With shielding cover Without
shielding cover With
shielding cover With flange
shielding cover
Q´ty/
box
Cir-
cuits Model No.
Gold-plated(flash)socket
Silver-plated socket
MD-S4130-10
MD-S5130-10
MD-S6130-10
MD-S7130-10
MD-S8130-10
4
5
6
7
8
200
200
200
200
200
MD-S4130-70
MD-S5130-70
MD-S6130-70
MD-S7130-70
MD-S8130-70
MD-S4130-90
MD-S5130-90
MD-S6130-90
MD-S7130-90
MD-S8130-90
Tin-plated socket
200
200
200
200
200
200
MD-S4100-70
MD-S5100-70
MD-S6100-70
MD-S7100-70
MD-S8100-70
MD-S9100-70
MD-S4100-90
MD-S5100-90
MD-S6100-90
MD-S7100-90
MD-S8100-90
MD-S9100-90
Q´ty/
box
Cir-
cuits Model No.
Gold-plated(flash)socket
Silver-plated socket
4
5
6
7
8
9
Tin-plated socket
MD-S4100-10
MD-S5100-10
MD-S6100-10
MD-S7100-10
MD-S8100-10
MD-S9100-10
Q´ty/
box
Cir-
cuits Model No.
Gold-plated(flash)socket
Silver-plated socket Tin-plated socket
MD-S8000B-10
8200
MD-S8000B-70 MD-S8000B-90
Q´ty/
box
Cir-
cuits Model No.
Gold-plated(flash)socket
Silver-plated socket Tin-plated socket
MD-S8100B-10
8200
MD-S8100B-70 MD-S8100B-90
Q´ty/
box
Cir-
cuits Model No.
Gold-plated(flash)socket
Silver-plated socket Tin-plated socket
MD-S8130B-10
8200
MD-S8130B-70 MD-S8130B-90
Q´ty/
box
Cir-
cuits Model No.
Gold-plated(flash)socket
Silver-plated socket Tin-plated socket
MD-S4350-10
MD-S5350-10
MD-S6350-10
MD-S8350-10
4
5
6
8
200
200
200
200
MD-S4350-70
MD-S5350-70
MD-S6350-70
MD-S8350-70
MD-S4350-90
MD-S5350-90
MD-S6350-90
MD-S8350-90
19.4
M2.6
13
7
6.8
13.5
15.9
12.2
6.5
2.6
8.5
6
12.5
2.5
5.5
• Standard type: With shielding cover
• Standard type: Without shielding cover • Standard type: With flange shielding cover
• Type B: Without shielding cover
• Type B: With shielding cover
• Type B: With flange shielding cover
• Front shielding type
RoHS compliance Gold-plated products display (LF)(SN) on a label.
RoHS compliance Gold-plated products display (LF)(SN) on a label.
Silver-plated/Tin-plated products display (LF) on a label. RoHS compliance Gold-plated products display (LF)(SN) on a label.
Silver-plated/Tin-plated products display (LF) on a label.
RoHS compliance Gold-plated products display (LF)(SN) on a label.
Silver-plated/Tin-plated products display (LF) on a label.
RoHS compliance Gold-plated products display (LF)(SN) A on a label.
Silver-plated/Tin-plated products display A on a label.
( shows space.)
RoHS compliance Gold-plated products display (LF)(SN) on a label.
RoHS compliance Gold-plated products display (LF)(SN) on a label.
Silver-plated/Tin-plated products display (LF) on a label.
Front shielding type
［
［