EI Type Audio Isolation Transformer 20Hz-20kHz 600:600Ω for Telephone Systems

This EI-type audio isolation transformer is designed for audio systems and telecom isolation applications. Frequency range is 20Hz to 20kHz. Impedance is 600:600Ω. Turns ratio is 1:1.Withstand voltage: 1250VAC/1mA/2 seconds (Primary-Secondary).It is widely used in telephone systems, PABX systems, modems, multimedia audio equipment, and telecom isolation applications.

Features 

• Turns ratio – 1:1 (Pin1-3 : Pin6-4)

• Impedance – 600Ω ±10% @1KHz

• Primary inductance – 1.5H Min @250Hz, 0.5V

• DCR (Pin1-3 / Pin6-4) – 75Ω Max

• Insertion loss – ≤1.0dB @1KHz

• Frequency response – ±0.35dB Max (300Hz-4.0KHz)

• Return loss – ≥20dB @300Hz / ≥23dB @1KHz/4KHz

• Longitudinal balance – ≥70dB (200Hz-4.0KHz)

Electrical specification:

• Turns ratio: Pin1-3 : Pin6-4=1:1
• Pin1-3 inductance: 1.5H Min@250Hz,0.5V
• Impedance: 600Ω±10%@1KHz,0dB,4-6 W/H 600Ω Load
• Pin1-3 DCR: 75Ω Max
• Pin4-6 DCR: 75Ω Max
• Insertion loss: 1.0dB Max@1KHz,0dB,W/H 600Ω Load
• Frequency response: ±0.35dB Max@ 300Hz~4.0KHz
• Return loss: 20dB Min@ 300Hz
• 23dB Min@ 1KHz
• 23dB Min@ 4KHz
• Longitudinal BAL.: 70dB Min@200Hz~4.0KHz
• Hi-Pot: 1250VAC,1mA,2S Pri to Sec

• Operating temperature:-25 to +125°C

  Storage temperature: -25 to +85°C

Applications

• Telephone systems

• PABX private branch exchanges

• Modems

• Multimedia audio equipment

• Telecom isolation

• Audio signal isolation

• Broadcast equipment

• Communication equipment

Shinhom Policy of quality control

It is Shinhom surviving lifeline to seek for customer satisfaction,which can be gained by a combination of superior quality,reasonable delivery time , competitive prices as well as customer-oriented services,so as to ensure that the turned out products measure up to customers,demands .

FAQ

Q: What is the significance of the return loss parameter?

A: Return loss ≥20dB @300Hz and ≥23dB @1kHz/4kHz indicates the transformer has excellent impedance matching characteristics in the audio frequency band. Signal reflection is low, energy transmission efficiency is high, ensuring audio signal quality.

Q: What does longitudinal balance ≥70dB mean?

A: Longitudinal balance ≥70dB indicates the transformer has strong common-mode signal suppression capability. It effectively reduces ground loops and external noise coupling, providing better anti-interference performance in telecom and audio applications.

Q: How to apply for samples? What is the lead time?

A: You can submit a sample application through our website or email. Please provide your company information and target model. Samples are free of charge and will be shipped within 3-5 working days. Mass order lead time is generally 2-8 weeks.