Hammond 107D Dual 150 Ohm CT 1:1 Miniature Isolation Transformer

The 107D is a 1:1 miniature audio transformer in the 107 Series, with 150 ohm centre-tapped windings on both the primary (pins 1-3) and the secondary (pins 4-6). The equal ratio and centre taps on both sides make it a fit for the isolation and line matching roles the series is designed for, as well as audio input and output duty.

It handles 150mw from 150 Hz. to 50 Khz., and its frequency range is 150 Hz. to 80 Khz. +/- 1.5db at +0, +10 and +20 dbm (no D.C. saturation); the drawing lists ±1.5db from 300Hz to 50KHz as the frequency response. Typical DCR is 22 ohms primary (11.0/11.0 ohms) and 27 ohms secondary (13.5/13.5 ohms); the table values are 20 and 25 ohms (+/- 20%). Both windings measure 312 mH and 1.4 K ohms impedance at 1.0 kHz, 1.0 V, and leakage inductance is 190 mH. Maximum D.C. unbalance is 12 mA; dielectric strength is 100 Vrms.

Every 107 Series unit is epoxy potted in an attractive black molded case, and the rugged potting produces a completely sealed part that withstands severe environmental conditions. It will withstand soldering for 10 sec. at 260 degrees C, with a maximum ambient temperature of 85 degrees C; the casting epoxy has a workable range of -40°C to +105°C under a normal rate of change, not including thermal shock. Primary and secondary are interchangeable according to the drawing.

It mounts on a PC board with pin-type terminals of min. 0.187" length and is RoHS and REACH compliant, with a shipping weight of 0.02 lbs (0.01 kg).