I'm trying to parameterize this device to find a suitable equivalent. Trouble is, there seems to be no datasheet available, and one of the two secondaries are measuring open, so complete measurements are not possible. The manufacturer has the 5046-X006 datasheet, but nothing for the X005.

  • Primary and one secondary measure 1.0Ω DCR
  • With good secondary open, primary measures 3.61mH / 143Ω (LCR meter)
  • With primary open, good secondary measures 3.9mH / 143Ω
  • With good secondary shorted, primary measures 0.02mH / 1Ω
  • With primary shorted, good secondary measures 0.03mH / 1Ω

Vacuumschmelze 5046-X005 gate pulse transformer

From what I can gather, the ratio is 1:1.1:1.1. Two of these are present in parallel and they function as 140kHz power switch-mode transformers. They are driven from unipolar 24vDC and clamped to -24vDC. Here is a primary waveform in-circuit:

Primary of VAC 5042-X005

This Vacuumschmelze document lists their modern devices and none are rated for >100kHz, whereas the X006 (closest datasheet I could find) is rated for 130kHz. But only the X100 (L=1.4mH) and X008 (through-hole, 18v/100kHz) are available from Mouser...

Is this a lost cause?

  • 1
    \$\begingroup\$ Don't give up there are faster pulse transformers to be found \$\endgroup\$ Jan 22, 2020 at 19:00
  • 1
    \$\begingroup\$ I work in marketing at VAC and like to leave a short comment: of course, VAC has data-sheets for all products they manufacture. As the item in the photo is a customer specific product, it cannot be published. I would suggest that you contact the manufacturer of the device, this transformer was built in. They should be able to help you. Best wishes and good luck. \$\endgroup\$ Feb 24, 2020 at 12:41

2 Answers 2


It appears to be labelled the same as a '5046×005 Transformers 10 nos Siemens S120'
These are advertised online by a number of sellers.
One example can be found here


I disassembled this transformer and determined its following data: primary winding - 27 turns, wire diameter 0.11, two secondary windings, each with 30 turns, wire diameter 0.1. The outer diameter of the ferrite ring is 9 mm, the inner diameter is 6 mm, and the height of the ring is 5 mm.

  • \$\begingroup\$ 0.11 and 0.1 mm? \$\endgroup\$
    – winny
    Oct 8, 2021 at 11:56

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