Hammond 108T 10K CT 1:1 Isolation Potted PCB Audio Transformer

The 108T is a miniature epoxy potted audio transformer from the 500 mW-rated 108 Series, built for printed circuit board mounting. It has matched 10K ohm center-tapped primary and secondary windings with a 1:1 turns ratio, for isolating two 10K ohm audio circuits. Designers of audio input, line matching, isolation and output stages will find it a compact, board-level way to add transformer coupling.

Nominal impedances are 10K ohm CT on the primary (pins 1-3) and 10K ohm CT on the secondary (pins 4-6). The ordering table lists D.C. resistance of 1050 ohms primary and 1200 ohms secondary (+/- 20%) and a maximum D.C. unbalance of 1.5 mA. The part drawing gives typical values of 424Ω (172Ω/252Ω) primary DCR, 11.7 H primary and 11.8 H secondary inductance, 2.3 H leakage inductance, a 1:1 turns ratio and 500 Vrms dielectric strength.

The series is rated 500 milliwatt (+/- 1.5 db, 300 Hz. - 50 KHz.), and the 108T drawing lists a power level of 150 mW from 300 Hz to 50 kHz with typical output power of 0.500 W. Frequency range is 300 Hz to 50 kHz +/- 1.5 dB at +0 dBm and 300 Hz to 100 kHz +/- 1.5 dB at +20 dBm, measured with no D.C. saturation. Power ratings are maximum at the lowest frequency, and the secondary may be used as the primary and vice versa.

Construction is rugged epoxy potting in a black molded case, producing a completely sealed unit, with pin type P.C. board terminals of at least 0.187" length. The part withstands soldering for 10 seconds at 260 °C, is rated for 85 °C maximum ambient, and the casting epoxy has a workable range of -40 °C to +105 °C. It is RoHS and REACH compliant, made in Canada, and ships at 0.08 lbs (0.04 kg).