Application Notes:
Compact V.92 T14H
and Telephone Line Impedance Matching Transformers for Modems|
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Telephone Modem Coupling Transformers:
Low Cost Top Quality Designed to meet FCC Part 68.31(a) standards for data & voice access Public Switched Telephone Networks.
Lead-Free soldering Process. RoHS compliant products.
Designed for ITU / CCITT V.90, 56Kbps, V.34 33.6Kbps & 28.8Kbps, V.32terbo 19.2Kbps, V.32 14.4Kbps industry standards modems.
Telephone line isolation, impedance matching & line balance for voice band telephones; and DC bias current up to 90mA.
Top Quality Highly Permeable Super thin Nickel Alloy Cores, Thermal Molded Phenolic UL 94V.0 Bobbins. Hard Copper Molded pins. Top Quality UEW2 Magnet Copper Wires.
Impregnated with Varnished. Insulation with 631S Polyester tapes.
UL Dielectric Strength of 1500 VAC min. between windings and core. T19Z is tested to 3750 Vrms for International requirements.
UL Insulation Resistance of 2 Mega Ohms at 500VDC between windings and core.
Analog Modem Coupling Transformer Selection Guide (drawings in Part Number Listings in pdf):
|
Part Number |
Modem Applications | Special Features |
| T14H | V.92 56Kbps, Data/FAX/Voice | Small circuit board footprint, compact, full function |
| T14N | 14400bps, DTMF, FAX/Voice | Low cost dry circuit telephone coupling line matching |
| T16N | 28800bps, Data/FAX/Voice | Economical for Data, FAX, and voice modem |
| T24Z | V.92, above 56Kbps, Data | High current, high performance, full industry size |
| T16Z | 14400bps, Voice, DTMF, FAX | Wet circuit, 55mA current for phone line coupling |
| T19Z | 14400bps, Voice/FAX/Data | Wet circuit, 90mA bias current, 3750Vrms International |
Application Notes:
Compact V.92 T14H
and Telephone Line Impedance Matching Transformers for ModemsModem Transformer Specifications:
| Part Number |
Turn Ratio |
Impedance Ohms |
Inductance Primary |
Resistance Ohms, DC |
Insertion Loss @ 1KHz |
Return Loss at 300 & 1KHz |
Primary DC Bias current |
| T14H | 1 : 1 | 600 : 390 | 4 H | 95 : 120 | 2.5 dB | 20 & 25 dB | 0 mA, Dry |
| T14N | 1 : 1 | 600 : 600 | 350 mH | 80 : 75 | 1.6 dB | 21 & 35 dB | 0 mA, Dry |
| T16N | 1 : 1 | 600 : 600 | 360 mH | 60 : 60 | 1.3 dB | 28 & 38 dB | 0 mA, Dry |
| T24Z | 1 : 1 | 600 : 374 | 12 H | 140 : 150 | 2.0 dB | 20 & 25 dB | 0 mA, Dry |
| T16Z | 1 : 1 | 600 : 600 | 420 mH | 82 : 82 | 2.2 dB | 21 & 32 dB | 55mA, Wet |
| T19Z | 1 : 1 | 600 : 600 | 400 mH | 75 : 105 | 1.8 dB | 15 & 35 dB | 90 mA, Wet |
Transformer Dimension in inches and Adobe Acrobat pdf drawings
| Part Number |
W" x L" H" |
| T14H | 0.44 x 0.57 x 0.50 |
| T14N | 0.57 x 0.55 x 0.49 |
| T16N | 0.63 x 0.55 x 0.59 |
| T24Z | 0.89 x 0.49 x 0.97 |
| T16Z | 0.63 x 0.55 x 0.59 |
| T19Z | 0.75 x 1.18 x 0.51 |
T14H/T14N T16N/T16Z T19Z T24Z
