1.25FJ CONNECTOR
1.25mm pitch/Board-to-board connectors
1
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.
• 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 Ωmax.
After environmental testing/60m Ωmax.
Long type………Initial value/70m Ωmax.
After environmental testing/90m Ωmax.
1.25FJ-N type… Initial value/50m Ωmax.
After environmental testing/100m Ωmax.
• Insulation resistance: 500M Ωmin.
• 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.
Standards ––––––––––––––––––––––
0Recognized E60389
1Certified LR20812
φ0.7＋0.1
1.25±0.05
1.7min
1.7min.
1.0min.
5.0±0.5
1.0min.
2.5±0.05
2.0±0.05 2.0±0.05
2.5 ±0.05
1.25±0.05
0φ0.7＋0.1
0
φ0.7＋0.1
1.25±0.05
1.7min.
1.7min.
1.0min.
19.5±0.5
1.0min.
2.5±0.05
2.0±0.05 2.0±0.05
2.5±0.05
1.25±0.05
0φ0.7＋0.1
0
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.
（13.0）
3.0 5.0
（5.0）2.0 2.0
2.5
4.0
24.5
（31.8）
2.5
5.0
3.0
5.9
（27.5）
3.0 5.0
（19.5） 2.0
2.0
Short type Long type
φ0.8＋0.1
2.5±0.05
2.5±0.05 1.0min 2.5±0.05
1.0min
20.5±1.5
2.5±0.05 1.7 min.
1.25±0.05
1.25±0.05
0φ0.8＋0.1
0
1.7 min.
1.25FJ-N type(250)
2.5±0.05
2.5±0.05 1.0min 2.5±0.05
1.0min
24.5±1.5
2.5 ±0.05 1.7min.
1.25±0.05
1.25±0.05
1.7 min.
φ0.8＋0.1
0φ0.8＋0.1
0
1.25FJ-N type(280)
PC board layout (viewed from component side) and Assembly layout
2
B
A（1.7）
Circuit No.1
1.25 0.6
5.0
5.03.0
2.01.0
Circuits Model No.
Short type & Long type
1.25FJ-N type Short type &
Long type
1.25FJ-N type
Dimensions (mm)
Q'ty / box
AB
Material and Finish
Contact: Phosphor bronze, copper-undercoated, tin-plated (reflow treatment)
Housing: Glass-filled PA 66, UL94V-0
7
9
11
13
15
19
21
−
09R-1.25FJ
11R-1.25FJ
13R-1.25FJ
15R-1.25FJ
19R-1.25FJ
21R-1.25FJ
07RK-1.25FJN
−
11RK-1.25FJN
13RK-1.25FJN
−
19RK-1.25FJN
−
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
−
500
500
500
500
250
200
1,710
−
1,170
990
−
720
−
Short type & Long type
1.25FJ-N type
1.0
0.6
1.7
Circuit No.1
5.3
2.5
1.42.6
5.93.0
1.25
A
B
1.25FJ CONNECTOR
Circuits B
7
9
11
13
15
19
21
−
09P-1.25FJ
11P-1.25FJ
13P-1.25FJ
15P-1.25FJ
19P-1.25FJ
21P-1.25FJ
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
−
120
120
120
120
120
120
−
−
−
−
−
19P215S-1.25FJ
−
07P250K-1.25FJNA
−
11P250K-1.25FJNA
13P250K-1.25FJNA
−
19P250K-1.25FJNA
−
07P280K-1.25FJN
−
11P280K-1.25FJN
13P280K-1.25FJN
−
19P280K-1.25FJN
−
A
−
−
−
−
−
280
−
400
−
280
280
−
200
−
400
−
280
280
−
200
−
Model No.
Short type Long type 250 type 280 type 250 type 280 type
1.25FJ-N type
Dimensions (mm)
Short
type
Long
type
1.25FJ-N type
Q
'
ty / box
Material and Finish
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
1.25 A
B
4.0
Circuit No.1
0.6
29.522.0
3.0 5.0
HJST
2.0
3.0
1.7
4.2
3.2
4.7
5.03.0
0.6
2.5
0.15（31.5）
1.25 A
B
Circuit No.1
4.2
3.2
2.5
1.7
4.7
5.03.0
0.6
0.15（34.5）
1.25 A
B
Circuit No.1
RoHS compliance
RoHS compliance This product displays (LF)(SN) on a label.
Circuit No.1
1.25
（1.7）
0.6
A
B
4.0
3.0
1.55.0
3.0 15.0
2.01.0
1.25FJ-N type (250)
Short type Long type
1.25FJ-N type (280)
Plug
Receptacle
