The INFINITI EX35 front turn signal bulb size is 7440NA or 7440, while the rear turn signal bulb size is PY21W or 12496. The replacement chart covers vehicle production years from 2008 to 2012 with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7440 is an ANSI-standard single-filament wedge bulb in the T20 form factor, rated at 12V and 21W. It is the front turn signal bulb for the INFINITI EX35 across the 2008-2010 model years.
The 7440NA shares the same T20 wedge form factor, voltage, and wattage as the 7440 but features natural amber glass rather than a clear envelope. This variant replaced the 7440 in the front turn signal position for the 2011-2012 model years.
Because the 7440 and 7440NA share the same physical base and electrical ratings, the amber tint on the 7440NA is achieved through the glass itself rather than through a different socket or wiring configuration. Substituting a clear 7440 in a 2011-2012 application may affect the amber color output of the front turn signal.
The PY21W is an ECE-standard single-filament amber bulb rated at 12V and 21W. It uses a BAU15s bayonet base, which is an offset-pin base designed to prevent installation of non-amber bulbs in amber-designated sockets.
The BAU15s base of the PY21W is not interchangeable with the BA15s base found on many other common automotive bulbs. The offset pin configuration physically prevents cross-fitting, making socket compatibility a relevant factor for the 2011-2012 rear turn signal position on the EX35.
The 12496 is a Philips/Osram part number designation for a 12V halogen bulb intended for specialty applications. It serves as the rear turn signal bulb on the INFINITI EX35 for the 2008-2010 model years.
The rear turn signal specification for the INFINITI EX35 changed from the 12496 to the PY21W between the 2010 and 2011 model years, representing a shift from a Philips/Osram-designated halogen part to an ECE-standard bayonet-base bulb.
All four bulb types listed across both front and rear turn signal positions operate at 12 volts, consistent with standard 12V automotive electrical systems.
The 7440 and 7440NA are ANSI standards applicable to the US and Canadian markets, while the PY21W is an ECE standard with broader international application. The presence of both standards within the same model's production run reflects a change in regional or regulatory sourcing across model years.
The front and rear turn signal positions on the EX35 do not share a common bulb type in any single model year, requiring separate bulb selections for each position regardless of the year.