Hammond 141D 3000CT:1000CT Ohm Low Profile PCB Audio Transformer

The 141D is a low profile, PC board mount audio transformer from the 141 Series, matching a 3000 ohm center-tapped primary to a 1000 ohm center-tapped secondary. It suits OEM engineers and designers building compact audio circuit boards who need a small signal transformer with center taps on both windings.

Electrically, the 141D is rated for 150 milliwatts output with a maximum primary D.C. current of 1 mA. The series table lists D.C. resistance of 120 ohms on the primary and 51 ohms on the secondary, while the part drawing breaks this down by pin: 64.480 and 64.400 ohms on primary pins 1-2 and 2-3, and 23.230 and 22.900 ohms on secondary pins 4-5 and 5-6, each ±20%. Frequency response is 200 Hz to 50 kHz within +/- 1 dB, referenced at 1 kHz.

Typical primary inductance across pins 1-3 is 923.90 mH (7.88K ohm impedance) measured at 1 kHz, 1 V open circuit, with leakage inductance of 6.24 mH. Dielectric strength is 250 VRMS and the temperature class is up to 105 °C. The core uses high grade 29M6 silicon laminations.

Construction is low profile and open type, with pin terminals 0.25" long and 0.035" in diameter for direct P.C. board mounting. Net weight is 0.6 oz. The 141D is listed as RoHS and REACH compliant.