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| SH-101 Datasheet, PDF (21/45 Pages) NEC – DC Line Fileters | |||
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DIP Type
Noise Filters for Telephone Sets
ST-101A, 201A, 202A
[RoHS Compliant]
Common Mode for Telephone Sets
Model
Frequency range
(MHz)
Impedance
(kâ²) min.
Rated voltage
DC (V)
ST-101A
0.5 to 7 3 (at 0.5 MHz)
50
ST-201A
7 to 40
1.5 (at 7 MHz)
50
ST-202A
7 to 100 0.6 (at 100 MHz)
50
Rated current
(mA)
200
200
1000
DC resistance
(mâ²/Line) max.
250
150
50
Operating
temperature range
(ËC)
â20 to +65
â20 to +65
â20 to +65
⢠Withstanding voltage: 500VDC (one minute, between lines) ⢠Insulation resistance: more than10MⲠ(100VDC, between lines)
Remarks
AM band
FM band
FM band
Shape and Dimensions/Circuit Diagram
16 max.
10.5 max.
Circuit diagram
á
á
ø0.7
á
á
7.62±0.5
á
á
5.08±0.5
á
á
[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
101A
10
1
201A
202A
0.1
0.01
0.1
1
10
100
500
Frequency (MHz)
DC Line Filters VOL.10
21
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%$-70-&&
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