50k:1500 Ohm CT Epoxy Potted Input Transformer

The 106C is a miniature epoxy-potted input audio transformer from the 106 Series, with a 50000 ohm primary and a 1500 ohm center-tapped secondary. It mounts on a P.C. board and fits designers interfacing a high-impedance source into a lower-impedance, balanced input.

The center-tapped secondary is bifilar wound for balanced resistive and capacitive characteristics. Rugged black epoxy potting produces a completely sealed unit that withstands severe environmental conditions, including those of MIL-T-27 (Grade 5, Class S). Pins are square, 0.025 in square typical, and unused connections have no pin. According to the 106C drawing the part weighs 1.44 oz and has a maximum operating altitude of 50,000 ft.

The series table rates the 106C for 10 mW output with 1 dB insertion loss and a -1 dB low frequency roll-off at 60 Hz. Maximum primary DC is 0 mA. DC resistance is 2400 ohms primary and 52 ohms secondary, +/- 15%. The drawing gives these typical characteristics:

• Frequency response: +/-1.0 dB, 215 Hz to 20 kHz at 10 dBu
• DCR: 2300 ohms (pins 1-4), 25.145 ohms (pins 5-6), 25.150 ohms (pins 6-8), all +/-15%
• Primary inductance, pins 1-4, at 1 V, 1 kHz open circuit: 27 H, 186K ohms impedance
• Primary leakage inductance, pins 1-4, at 1 V, 1 kHz short circuit: 167.28 mH
• Dielectric strength 500 V RMS; temperature class 105 degrees C; peak working voltage 200 Vp-p

This part is RoHS and REACH compliant, follows drawing figure 7 and ships at 0.09 lbs (0.04 kg).