STCM21T

RF Balun Transformer Features:： STCM21T RF Balun Transformer, 1: 2CT Flux Coupled Transformer ◆1: 2CT Impedance ◆50Ω Characteristic Impedance ◆Frequency: 0.3to500 MHz ◆RF power: 0.25W ◆DC current: 30mA ◆Operating temperature range: -40℃ to +85℃ ◆Storage temperature range: -55℃ to +100℃ Applications: ◆For broadband and wireless communications ◆For VHF/UHF receivers/transmitters and push-pull amplifiers Dimension Diagram （Unit:mm）： Electrical structure： Rev.01 Recommended layout： Page 1 of 4 www.sunltech.com STCM21T RF Balun Transformer Pin configuration: Pin No. Function 1 Secondary (Output 2) 2 Centre tap (Ground) 3 Secondary dot (Output 1) 4 Primary dot (Input) 6 Primary (Ground) Application circuit ： Parameter Test Conditions Units Min Typ Max Main line Loss(out1) 0.3-500MHz dB － 1.50 2.50 Main line Loss(out2) 0.3-500MHz dB － 0.50 1.50 Amplitude Balance 0.3-500MHz dB － ±1.5 ±2.00 Phase Balance 0.3-500MHz ° － ±5.00 ±10.00 Input Return Loss 0.3-500MHz dB 10.00 18.00 － Rev.01 Page 2 of 4 www.sunltech.com STCM21T RF Balun Transformer Main line Loss(out2) dB dB Main line Loss(out1) Frequency(MHz) Frequency(MHz) Phase Balance dB Degrees Amplitude Balance Frequency(MHz) Frequency(MHz) dB Input Return Loss Frequency(MHz) Rev.01 Page 3 of 4 www.sunltech.com RF Balun Transformer STCM21T Recommended Soldering Temperature Graph： Packging Dimension For Caeeier Tape(UNIT:mm): Rev.01 Page 4 of 4 www.sunltech.com