MD
CONNECTOR
Miniature circular connectors
Standards ––––––––––––––––––––––
0
Recognized E60389
1
Certified LR20812
Shielding effect
–
10
–
20
–
30
–
40
–
50
–
60
–
70
–
80
–
90
–
100
–
110
Shielding effect(dB)
Braided wires soldered to the metal shell
MD connector(with ground clip)
30
100
Frequency(MHz)
300
600
•The
shielding effect differs depending on the wire specifications.
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.
* Contact JST if Lead-Free product is required.
* Refer to "General Instruction and Notice when using
Terminals and Connectors" at the end of this catalog.
* Contact JST for details.
727
MD
CONNECTOR
PLUG –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Straight type plug
Contact
JST's exclusive one-piece contact is
formed and cold worked by stamping
presses to ensure the highest reliability.
Contact
Side entry type plug
Housing B
Metal Shell
Three shell types
(standard, A and B)
are available.
Metal Shell
One piece including
ground clip
Housing A
Ground clip
Housing A
Housing A is designed
to keep the contacts
firmly in place while
protecting them from
damage.
If used, the
ground clip is
crimped to cover
the cable braid.
Housing B
Solder tail
Assembled product
Molded product
Assembled product
Molded product
Features––––––––––––––––––––––––
• Crimp contact with integral construction for
improved reliability
JST's exclusive one-piece construction of the pin and crimping
section not only enhances the connection's reliability but also
substantially improves productivity and efficiency by eliminating
the need for soldering. Little force is required to insert the
contact into the housing. Even a wire as thin as AWG #30 can
be inserted easily by hand.
Specifications –––––––––––––––––––
Materials
Part name
Material and Finish
Phosphor bronze, nickel-undercoated
Mating section: gold-plated
Crimping section: tin-plated
Phosphor bronze, copper-undercoated, tin/lead-plated
Phosphor bronze, nickel-undercoated silver-plated
PBT, UL94V-0, black
Mild steel, nickel-plated
Brass, nickel-plated
Contact
Housing A, B
Metal shell
Ground clip
• Easy assembly without using special tools
Other than crimping tools, no special tools are required to
assemble the connector. Simply install the contacts, housing,
ground clip and metal shell in that order. This makes it possible
to greatly increase assembly efficiency, resulting in significant
reductions in total cost.
Characteristics
Current rating
Voltage rating
Temperature range
Contact resistance
Insulation resistance
Withstanding voltage
Applicable wire
1.0A, AC, DC (using AWG #26)
50V, AC, DC
-
25˚C to
+
85˚C
• Simple braid-to-connector assembly and
effective EMI protection
Because the ground clip is crimped to the cable braid, no
soldering is required. While securely holding the cable, the
ground clip also ensures the integrity of the grounded circuit.
This is a critical factor in reducing noise. The shielding effect of
this method is approximately 20dB greater than that obtained by
the conventional method of bundling and soldering cable braid
to the metal shell.
(including temperature rise in applying electrical current)
Initial value: 100mΩ max.
After environmental testing: 300mΩ max.
50MΩ min.
500V AC/minute
AWG #30 to #24
728
MD
Model number identification
CONNECTOR
Plug contact –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
• Series name
MD -
S
P
2
2
40
• Product from: S ... Chain, B ... Loose piece
• Type of contact: P ... Plug contact
• Applicable wire: 1 ... AWG #26 to #24
2 ... AWG #30 to #26
• Material: 2 ... Phosphor bronze
• Finish
40 ... Gold-plated (flash)
44 ... 0.76 micron(30 micro-inch) gold-plated
45 ... 1.3 micron(51 micro-inch) gold-plated
70 ... Silver-plated
90 ... Tin-plated
*Contact JST for details.
13.0(.512)
3.9(.154)
0.6 (.024) dia.
1.1
1.7
(.043) (.067)
Model No.
Gold-plated (flash)
MD-SP2240
MD-SP1240
Silver-plated
MD-SP2270
MD-SP1270
Tin-plated
MD-SP2290
MD-SP1290
mm
2
Applicable wire
AWG #
30 to 26
26 to 24
Insulation O.D. mm(in.)
0.7 to 1.1(.028 to .043)
1.0 to 1.2(.039 to .047)
Q´ty / reel
10,000
10,000
0.06 to 0.13
0.13 to 0.2
729
MD
CONNECTOR
Housing –––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Housing A
(With 4 to 8 circuits)
8.15 (.321) dia.
2.5(.098) 2.5(.098)
1.0(.039) 1.0(.039)
2.0(.079)
(With 9 circuits)
9.15 (.360) dia.
3.1(.122) 3.1(.122)
1.0(.039) 1.0(.039)
0.9(.035)
1.1(.043)
0.4(.016) 2.0(.079)
8.4(.331)
8.4(.331)
2.0(.079)
0.4(.016)
2.0(.079) 2.0(.079)
0.4(.016)
6.1(.240)
2.0(.079)
0.7(.028)
2.7(.106) 2.6(.102)
6.1(.240)
Housing B
(With 4 circuits)
0.4(.016) 1.6(.063) 1.2(.047)
8.15 (.321) dia.
2.5(.098) 2.5(.098)
(With 5 circuits)
8.15 (.321) dia.
2.5(.098) 2.5(.098)
1.0(.039)
2.0(.079)
(With 6 circuits)
8.15 (.321) dia.
2.5(.098) 2.5(.098)
1.0(.039) 1.0(.039)
2.0(.079)
4.6(.181)
1.0(.039)
4.6(.181)
1.0(.039)
4.6(.181)
1.0(.039)
2.0(.079)
JST
2.0(.079)
2.0(.079)
2.0(.079) 2.0(.079)
0.4(.016)
JST
2.0(.079) 2.0(.079)
2.0(.079) 2.0(.079)
(With 8 circuits)
8.15(.321) dia.
2.5(.098) 2.5(.098)
1.0(.039) 1.0(.039)
2.0(.079)
(With 9 circuits)
9.15(.360) dia.
3.1(.122) 3.1(.122)
1.0(.039) 1.0(.039)
0.9(.035) 1.1(.043)
2.0(.079)
1.0(.039)
1.0(.039)
2.0(.079)
2.0(.079)
0.4(.016)
2.0(.079) 2.0(.079)
0.4(.016)
JST
0.7(.028)
2.7(.106) 2.6(.102)
Combined housings A and B
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.
Housing A
Housing B
0.4(.016)
JST
Circuits
Housing A
4
5
6
8
9
Model No.
Housing B
MD-PI4B
MD-PI5B
MD-PI6B
MD-PI8B
MD-PI9B
MD-PI4A
—
MD-PI6A
MD-PI8A
MD-PI9A
0.4(.016)
JST
Q´ty / box
1,000
1,000
1,000
1,000
1,000
Note: MD-PI5B is not CSA certified.
730
MD
CONNECTOR
Metal shell (straight type) ––––––––––––––––––––––––––––––––––––––––––––––––––
Standard type
(With 4 to 8 circuits)
25.0(.984)
21.6(.850)
9.05(.356) dia.
(With 9 circuits)
100°
3.4(.134)
9.95(.392) dia.
25.0(.984)
21.6(.850)
100°
3.4(.134)
Solder tail
Solder tail
Type A
(features polarizing keys, usable with S-VHS connector)
Type B
(features 4 polarizing keys, usable with having 8 circuits)
100°
25.0(.984)
21.6(.850)
9.05(.356) dia.
3.4(.134)
100°
9.05(.356) dia.
25.0(.984)
21.6(.850)
3.4(.134)
Solder tail
Solder tail
Model No.
Circuits
Standard
With solder tail
4 to 8
9
Type A (features three polarizing keys)
With solder tail
*MD-PS8AT
—
Without solder tail
*MD-PS8AT1
—
Type B (features 4 polarizing keys
...8 circuits only))
With solder tail
*MD-PS8BT
—
Without solder tail
*MD-PS8BT1
—
Q´ty / box
Without solder tail
*MD-PS8T1
MD-PS8T
750
750
MD-PS9T
*MD-PS9T1
*Marked products are not CSA certified.
Ground clip ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
Circuits
4 to 8
Model No.
MD-PCC8T-S1
MD-PCC8T-S2
MD-PCC9T-S3
Applicable cable O.D.
mm(in.)
2.7(.106) to 3.8(.150)
4.3(.169) to 5.5(.217)
3.6(.142) to 4.8(.189)
Q´ty / reel
1,000
1,000
1,000
9.4(.370)
5.0(.197) 3.3(.130)
9
731
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