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
TWD129.50
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
TWD202.00
Each
units
22mH - - - 1:1 Through Hole - 16.7 x 17.6 x 11.3mm 11.3mm 16.7mm 17.6mm - - -
RS Stock No. 173-6429
Mfr. Part No.IT258
BrandSchaffner
TWD347.00
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. 170-4972
Mfr. Part No.IT258
BrandSchaffner
TWD205.30
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. 173-6356
Mfr. Part No.IT242
BrandSchaffner
TWD213.00
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
TWD25.60
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. 106-8558
Mfr. Part No.1002C
TWD166.00
Each (In a Tube of 30)
units
3mH 1.4Ω 1.7Ω - 1:1 PCB Mount 9µH - - 15.06mm 15.06mm - - -
RS Stock No. 170-4968
Mfr. Part No.IT242
BrandSchaffner
TWD136.50
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. 715-6908
Mfr. Part No.782485/55C
TWD73.00
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
TWD52.40
Each (In a Tube of 50)
units
513µH 0.6Ω - - 1:1.5 Through Hole 0.192µH - - 9.14mm 10.46mm - - -
RS Stock No. 800-4344
Mfr. Part No.1002C
TWD170.00
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. 167-4838
Mfr. Part No.DXW21BN7511SL
BrandMurata
TWD12.00
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. 831-9324
Mfr. Part No.ATB3225-75011CT
BrandTDK
TWD62.00
Each
units
- 0.7Ω - 0.8dB 1:1 Surface Mount - 3.2 x 2.5 x 2.3mm 2.3mm 3.2mm 2.5mm 200MHz 5MHz -
RS Stock No. 162-0595
Mfr. Part No.IT243
BrandSchaffner
TWD136.50
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. 163-4316
Mfr. Part No.750311624
TWD232.50
Each (On a Reel of 200)
units
9µH 0.034Ω 0.021Ω - 1.5:1 Surface Mount 250nH 17.75 x 13.46 x 12.7mm 12.7mm 17.75mm 13.46mm - - -
RS Stock No. 883-9092
Mfr. Part No.IT155
BrandSchaffner
TWD165.80
Each (In a Pack of 100)
units
5mH 1.2Ω 1.2Ω - 1:1 Through Hole 85µH - - 27mm 22.5mm 40 kHz, 500 (Data Transmission) kHz - Enclosed
RS Stock No. 170-9231
Mfr. Part No.76601/1C
TWD68.10
Each (On a Reel of 50)
units
- - - - 1:1 Through Hole - 12.7 x 8.89 x 6.35mm 6.35mm 12.7mm 8.89mm - - -
RS Stock No. 715-6882
Mfr. Part No.78253/35MVC
TWD119.00
Each
units
142µH 0.5Ω - - 1:2.14 Surface Mount 5µH 9 x 12.7 x 6.55mm 6.55mm 9mm 12.7mm - - -
RS Stock No. 163-4296
Mfr. Part No.750311305
TWD281.40
Each (On a Reel of 250)
units
50µH 0.175Ω 0.028Ω - 3:1 Surface Mount 2µH 15.24 x 13.34 x 11.43mm 11.43mm 15.24mm 13.34mm - - -
RS Stock No. 883-9124
Mfr. Part No.IT370
BrandSchaffner
TWD589.70
Each (In a Pack of 300)
units
0.3mH 0.16Ω 0.18Ω - 1:1 Through Hole 6µH - - 27mm 32.2mm 40 kHz, 500 (Data Transmission) kHz - Enclosed