Hammond 140UEX 10K Ohm Shielded Audio Isolation Transformer

The 140UEX is a studio grade 1:1 audio transformer with a 10K ohm primary and a 10K ohm secondary. Its listed typical application is input/output isolation, and the drawing also names line matching, driver and hybrid applications. It is aimed at audio designers who need to isolate higher-impedance signal circuits while keeping the same impedance on both sides.

Typical drawing values are 886.0 ohms primary DCR (RED - YEL) and 903.5 ohms secondary DCR (GRN - BLU), with 36.5 H inductance and 882k impedance on each winding at 1 kHz, 1 V.

An 80% nickel core provides high permeability with low losses, and the metal can shields against a broad range of external sources. The 140UEX operates across 20 Hz to 20 kHz (1 dB), is rated for 10.0 dBm output (marked 5 mW) and is designed for lowest distortion at +10 dBm or less. Insertion loss is under 1.0 dB, return loss 20.0 dB, longitudinal balance -50.0 dB and dielectric strength 500 Vrms.

It is a chassis mount, shielded transformer in a metal can with an adjustable height case bracket. The case is 1.00 in (25 mm) high and 1.25 in (32 mm) in diameter, mounting holes are listed at 1.88 in (48 mm), leads are 5.00 in (127 mm) long, and net weight is 3 oz (shipping weight 0.13 lbs / 0.06 kg). The drawing shows a 1.875 in mounting hole spacing. The part is made in Canada and RoHS and REACH compliant.