Microspire just developed a ruggedizzed 300mW push pull transformer with 2400Vrms DWV in a 8.7 x 5.7 x 7.7 mm package weighing less than 2 grams.
It has been designed to work with a MAX845 circuit under a -55°C+125°C temperature range.
Initially designed for civil aerospace ,this very light SMD high grade transformer offers a DWV of 2400 Vrms during 3 seconds.

It is described into the data sheet :
http://www.exxelia.com/uk-20-p139-push-pull-transformers.html