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| SH-101 Datasheet, PDF (24/45 Pages) NEC – DC Line Fileters | |||
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DIP Type
Common Mode for Telephone Sets
Noise Filters for Telephone Sets
ST-104A4, 204A Series
[RoHS Compliant]
Model
ST-104A4
ST-204A1
ST-204A3
ST-204A4
Frequency range
(MHz)
Impedance
(kâ²) min.
Rated voltage
DC (V)
0.5 to 7 3.0 (at 0.5 MHz)
50
7 to 100 0.25 (at 10 MHz)
50
7 to 40 1.0 (at 7 MHz)
50
7 to 40 0.6 (at 7 MHz) REF
50
Rated current
(mA)
500
500
500
500
DC resistance
(â²/Line) max.
0.36
0.10
0.17
0.12
Operating
temperature range
(ËC)
â20 to +75
â20 to +75
â20 to +75
â20 to +75
⢠Withstanding voltage: 500VDC (one minute, between lines) ⢠Insulation resistance: more than 10MⲠ(250VDC, between lines)
Remarks
AM band
FM band
FM band
FM band
Shape and Dimensions/Circuit Diagram
*12 max. with ST-104A4
13 max.
*11max. 3.5±1.0
Bottom view
2.54±0.5Ò3
áá
áá
áá
á
á
Circuit diagram
1
5
2
6
3
7
4
8
[mm]
Installation Examples
Telephone set
Rosette
Installation position
Terminal
(facsimile, card reader, etc.)
Telephone line
Installed filter
ST-201 ST-101
ST-201A ST-101A
ST-202 ST-101F2
ST-202A ST-101F4
ST-202S ST-110AH
SZ-03 ST-110AV
ST-110BH
ST-110BV
ST-104A4
ST-204A1
ST-204A3
ST-204A4
Line terminal unit
Installed filter LFT
HFT
Design Examples
áInstallation at rosette or circuit input/output
ST, LFT, HFT
áInsertion in Driver/ Receive
circuit in telephone
Telephone
L1
Circuit
Drv.
Telephone
L2
Rec.
Impedance vs. Frequency
100
10
104A4
1
0.1
0.01
0.1
204A3
204A4
204A1
1
10
100
500
Frequency (MHz)
DC Line Filters VOL.10
24
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