On Sun, 13 Dec 2009 12:34:40 -0800 (PST), ghiotom
put finger to keyboard and composed:

TO-220 3 leads. Below 041M03 is R535 with the Motorola symbol. This is
a vehicle information center from a 1996 Jeep.

Here's a pictu
http://i747.photobucket.com/albums/x...91213-1448.jpg

The MC33060AP is a "Precision SWITCHMODE Pulse Width Modulator Control
Circuit":
http://www.datasheetcatalog.org/data.../MC33060AD.pdf

Could the subject TO-220 device be an NPN chopper, or N-channel
MOSFET, in a SMPS?

The pinout looks like BCE or GDS, from L to R.

The SMPS could be generating 50VDC (?) for a vacuum fluorescent
display.

FWIW, here is a VFD reference design for automotive applications:
http://www.embeddeddesignindia.co.in...URCES=DOWNLOAD

- Franc Zabkar
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