1.25FJ
CONNECTOR
1.25mm pitch/Board-to-board connectors
• Low profile
• Allows connection after mounting
• Assures a reliable connection
Specifications –––––––––––––––––––
• Current rating: 0.5A(1.0A :1.25FJ-N type) AC, DC
• Voltage rating: 50V AC, DC
• Temperature range: -25˚C to +85˚C
(including temperature rise in applying
electrical current)
• Contact resistance:
Short type………Initial value/40m
Ω
max.
After environmental testing/60m
Ω
max.
Long type……… Initial value/70m
Ω
max.
After environmental testing/90m
Ω
max.
1.25FJ-N type… Initial value/50m
Ω
max.
After environmental testing/100m
Ω
max.
• Insulation resistance:
500M
Ω
min.
• Withstanding voltage: 500V AC/minute
• Applicable PC board thickness: 1.6mm
* Compliant with RoHS.
* Refer to "General Instruction and Notice when using
Terminals and Connectors" at the end of this catalog.
* Contact JST for details.
The 1.25FJ connector is a 1.25mm pitch
board-to-board connector. Its plug
consists of a unique flexible hinge that
absorbs circuit board misalignment.
Board-to-board connection requires less
labor and is more reliable because the
connection can be made without the use
of harnesses after the printed circuit
boards are installed in their enclosures.
Standards ––––––––––––––––––––––
1
Certified LR20812
Long type
0
Recognized E60389
PC board layout (viewed from component side) and Assembly layout
Short type
1.7min.
1.7min.
1.7min
1.7min.
5.0
±0.5
2.0
±0.05
1.0min.
1.0min.
2.0
±0.05
（13.0）
2.0
±0.05
19.5
±0.5
1.0min. 1.0min.
2.0
±0.05
（27.5）
2.5
±0.05
1.25
±0.05
1.25
±0.05
2.5
±0.05
5.0
2.5
±0.05
1.25
±0.05
1.25
±0.05
2.5
±0.05
2.0 （5.0）
2.0
3.0
2.0
＋0.1
φ0.7
0
＋0.1
φ0.7
0
（19.5）
2.0
＋0.1
φ0.7
0
＋0.1
φ0.7
0
1.25FJ-N type(250)
1.7
min.
1.7
min.
20.5
± 1.5
2.5
±0.05
1.0
min
1.0
min
2.5
±0.05
1.25FJ-N type(280)
1.7
min.
1.7
min.
24.5
±1.5
2.5
±0.05
（31.8）
4.0
1.0
min
1.0
min
2.5
±0.05
5.9
2.5
±0.05
1.25
±0.05
1.25
±0.05
2.5
±0.05
1.25
±0.05
2.5
±0.05
1.25
±0.05
2.5
±0.05
φ0.8
0
＋0.1
φ0.8
0
＋0.1
φ0.8
0
＋0.1
φ0.8
0
＋0.1
2.5
24.5
2.5
Note: 1. Tolerances are non-cumulative:
±
0.05mm for all centers.
2. Hole dimensions differ according to the kind of PC board and piercing method. The dimensions above should serve as a guideline. Contact JST for details.
3.0
5.0
3.0
5.0
1
1.25FJ CONNECTOR
Plug
Short type
4.0
3.0
1.5
Long type
4.0
3.0
Circuit No.1
3.0
H JST
5.0
A
B
0.6
3.0
（1.7）
1.25
1.0
2.0
1.25
0.6
A
B
0.15
5.0
22.0
29.5
15.0
Circuit No.1
4.2
3.2
2.0
1.25FJ-N type (250)
0.15
4.2
3.2
1.25FJ-N type (280)
（31.5）
4.7
3.0 5.0
1.7 1.25
A
B
0.6
Circuit No.1
2.5
1.7 1.25
A
B
0.6
Model No.
Circuits
7
9
11
13
15
19
21
Dimensions (mm)
1.25FJ-N type
250 type
280 type
07P280K-1.25FJN
−
11P280K-1.25FJN
13P280K-1.25FJN
−
19P280K-1.25FJN
−
Material and Finish
A
7.5
10.0
12.5
15.0
17.5
22.5
25.0
3.0 5.0
Circuit No.1
2.5
（34.5）
4.7
Q'ty / box
Short type
−
09P-1.25FJ
11P-1.25FJ
13P-1.25FJ
15P-1.25FJ
19P-1.25FJ
21P-1.25FJ
Long type
−
−
−
−
−
19P215S-1.25FJ
−
B
10.9
13.4
15.9
18.4
20.9
25.9
28.4
Short
type
−
120
120
120
120
120
120
Long
type
−
−
−
−
−
280
1.25FJ-N type
250 type
400
280 type
400
07P250K-1.25FJNA
−
11P250K-1.25FJNA
13P250K-1.25FJNA
−
19P250K-1.25FJNA
−
−
280
280
−
280
280
−
200
−
200
−
−
−
Contact: Short type & Long type / Phosphor bronze, tin-plated (reflow treatment)
Contact:
1.25FJ-N type / Copper-alloy, tin-plated (reflow treatment)
Housing: Glass-filled PA 66, UL94V-0
RoHS compliance
Receptacle
Short type & Long type
（1.7）
B
A
5.0
Circuits
7
9
11
5.0
13
15
19
21
Circuit No.1
1.25
0.6
1.0
2.0
Model No.
Short type & Long type 1.25FJ-N type
07RK-1.25FJN
−
09R-1.25FJ
−
11R-1.25FJ 11RK-1.25FJN
13R-1.25FJ 13RK-1.25FJN
15R-1.25FJ
−
19R-1.25FJ 19RK-1.25FJN
21R-1.25FJ
−
Dimensions (mm)
A
B
7.5
10.0
12.5
15.0
17.5
22.5
25.0
10.9
13.4
15.9
18.4
20.9
25.9
28.4
Short type &
Long type
Q'ty / box
1.25FJ-N type
1,710
−
1,170
990
−
720
−
−
500
500
500
500
250
200
3.0
1.25FJ-N type
1.7
B
A
5.3
Material and Finish
Contact: Phosphor bronze, copper-undercoated, tin-plated (reflow treatment)
Housing: Glass-filled PA 66, UL94V-0
RoHS compliance
This product displays (LF)(SN) on a label.
1.4
2.6
5.9
1.0
2.5
3.0
Circuit No.1
1.25
0.6
2
stm32/stm8
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