Telecom Transformers

Telecom transformers can serve a variety of roles. For example, they can function as isolation transformers, preparing the voltage before transmission across telecom cables or adjusting the voltage so that it is suitable for a low-voltage application inside the home.

What are telecom transformers used for?

The telecom transformer is one of the most common and vital components in any telecommunications system. Other types of equipment, such as resistors and capacitors, are sometimes used to achieve the same goals that a telecom transformer achieves. However, telecom transformers perform these tasks with a greater degree of efficiency and ease of use, and thus are more commonly used than their alternatives.

Types of telecom transformers

Telecom transformers are designed with different types of inductance, mounting styles and other specifications that dictate whether those devices will be appropriate for a given application or use in a given device.

They can be mounted in different ways. Some designs are surface mounted, while others are mounted through the holes in a breadboard.


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Description Price Primary Inductance Primary DC Resistance Secondary DC Resistance Insertion Loss Turns Ratio Mounting Type Leakage Inductance Dimensions Depth Length Width Maximum Operating Frequency Minimum Operating Frequency Construction
RS Stock No. 170-4969
Mfr. Part No.IT255
BrandSchaffner
TWD123.40
Each (In a Box of 200)
units
22mH - - - 1:1 Through Hole - 16.7 x 17.6 x 11.3mm 11.3mm 16.7mm 17.6mm - - -
RS Stock No. 173-6384
Mfr. Part No.IT255
BrandSchaffner
TWD193.00
Each
units
22mH - - - 1:1 Through Hole - 16.7 x 17.6 x 11.3mm 11.3mm 16.7mm 17.6mm - - -
RS Stock No. 170-4972
Mfr. Part No.IT258
BrandSchaffner
TWD195.60
Each (In a Box of 200)
units
2.5mH - - - 1:1 Through Hole - 16.7 x 17.6 x 11.3mm 11.3mm 16.7mm 17.6mm - - -
RS Stock No. 173-6429
Mfr. Part No.IT258
BrandSchaffner
TWD323.00
Each
units
2.5mH - - - 1:1 Through Hole - 16.7 x 17.6 x 11.3mm 11.3mm 16.7mm 17.6mm - - -
RS Stock No. 167-4838
Mfr. Part No.DXW21BN7511SL
BrandMurata
TWD11.50
Each (On a Reel of 2000)
units
- 75Ω 75Ω 1.4dB 1:1 Surface Mount - 2 x 1.2 x 1.2mm 1.2mm 2mm 1.2mm - - -
RS Stock No. 173-6356
Mfr. Part No.IT242
BrandSchaffner
TWD204.00
Each
units
2.5mH - - - 1:1:1 Through Hole - 16.7 x 17.6 x 11.3mm 11.3mm 16.7mm 17.6mm - - -
RS Stock No. 839-0913
Mfr. Part No.DXW21BN7511SL
BrandMurata
TWD24.20
Each (In a Bag of 5)
units
- 75Ω 75Ω 1.4dB 1:1 Surface Mount - 2 x 1.2 x 1.2mm 1.2mm 2mm 1.2mm - - -
RS Stock No. 170-4968
Mfr. Part No.IT242
BrandSchaffner
TWD130.10
Each (In a Box of 200)
units
2.5mH - - - 1:1:1 Through Hole - 16.7 x 17.6 x 11.3mm 11.3mm 16.7mm 17.6mm - - -
RS Stock No. 106-8558
Mfr. Part No.1002C
TWD154.40
Each (In a Tube of 30)
units
3mH 1.4Ω 1.7Ω - 1:1 PCB Mount 9µH - - 15.06mm 15.06mm - - -
RS Stock No. 800-4344
Mfr. Part No.1002C
TWD158.00
Each
units
3mH 1.4Ω 1.7Ω - 1:1:1 PCB Mount 9µH 15.06 x 15.06 x 15.75mm 15.75mm 15.06mm 15.06mm - - -
RS Stock No. 715-6908
Mfr. Part No.782485/55C
TWD70.00
Each
units
513µH 0.6Ω - - 1:1.5 Through Hole 0.192µH 9.14 x 10.46 x 6.35mm 6.35mm 9.14mm 10.46mm - - -
RS Stock No. 106-8561
Mfr. Part No.782485/55C
TWD49.90
Each (In a Tube of 50)
units
513µH 0.6Ω - - 1:1.5 Through Hole 0.192µH - - 9.14mm 10.46mm - - -
RS Stock No. 715-6879
Mfr. Part No.78253/35C
TWD88.00
Each
units
0.38mH - - 1:2.27 Through Hole 1µH 9 x 9.52 x 6.35mm 6.35mm 9mm 9.52mm - - -
RS Stock No. 170-4980
Mfr. Part No.IT314
BrandSchaffner
TWD338.30
Each (In a Box of 100)
units
35mH - - - 3:1:1 Through Hole - 25.5 x 25.5 x 25mm 25mm 25.5mm 25.5mm - - -
RS Stock No. 667-5940
Mfr. Part No.PT6SM
BrandOEP
TWD165.00
Each
units
3mH 0.65Ω 0.55Ω - 1:1:1 Surface Mount 1.8 μH, 3.5 μH 13.1 x 17 x 11.95mm 11.95mm 13.1mm 17mm - - -
RS Stock No. 756-7500
Mfr. Part No.750311599
TWD366.00
Each
units
8µH 0.03Ω 0.012Ω - 1.5:1 Surface Mount 1µH 29.08 x 23.11 x 11.43mm 11.43mm 29.08mm 23.11mm - - -
RS Stock No. 210-6330
Mfr. Part No.PT10E
BrandOEP
TWD266.00
Each
units
- 5.1Ω 2.6Ω - 2:1 Through Hole 115µH 15 x 15 x 16mm 16mm 15mm 15mm 1MHz 3kHz -
RS Stock No. 756-7440
Mfr. Part No.750311564
TWD302.00
Each
units
9.07µH 0.036Ω 0.007Ω - 3:1 Surface Mount 250nH 17.75 x 13.46 x 12.7mm 12.7mm 17.75mm 13.46mm - - -
RS Stock No. 170-4971
Mfr. Part No.IT248
BrandSchaffner
TWD137.10
Each (In a Box of 200)
units
17mH - - - 2:1 Through Hole - 16.7 x 17.6 x 11.3mm 11.3mm 16.7mm 17.6mm - - -
RS Stock No. 667-5947
Mfr. Part No.PT4SM
BrandOEP
TWD165.00
Each
units
3mH 0.36Ω 0.46Ω - 1:1 Surface Mount 3 μH, 4 μH 13.1 x 17 x 11.95mm 11.95mm 13.1mm 17mm - - -