Hammond 1140-LU-FPC Quad-Filar +27 dBu PCB Line Output Transformer

The 1140-LU-FPC is a printed circuit board mount line output transformer in the 1140-PC Series. Unlike its bi-filar siblings it uses quad-filar windings on an 80% nickel core, with each side split into two 150 Ω sections that combine to 600 Ω.

The manufacturer's drawing says this construction gives very low distortion levels and good output levels, and that the part can drive 600 Ω loads up to +27 dBu at 20 Hz. It notes the 1140-LU-FPC is suited to 1:2 step up applications, and that if a 1:1 ratio is needed better performance can be obtained from the 1140-LU-G. The drive signal should have no DC component and the source impedance should be as low as possible.

Pin-out: primary sections PIN 2–PIN 4 and PIN 3–PIN 5 (150 Ω each), PIN 2–PIN 5 600 Ω; secondary sections PIN 11–PIN 9 and PIN 10–PIN 8 (150 Ω each), PIN 11–PIN 8 600 Ω. DC resistance is 30/30 Ω on both primary and secondary at 20°C.

Typical data: frequency response -0.001 dB at 20 Hz and +0.007 dB at 20 kHz, THD 0.007% at 1 kHz and 0.001% at 20 Hz (4 dBu), common mode rejection 105 dB at 60 Hz and 75 dB at 3 kHz, phase shift 0.08° at 20 Hz and -3.80° at 20 kHz. Primary input impedance is 180 Ω and secondary output impedance 80 Ω at 1 kHz; capacitance is 30 nF and 80 pF to shield and case; dielectric strength 250 Vrms. Shipping weight 0.2 lbs (0.09 kg); RoHS and REACH compliant.