The Lexus ES330 front and rear turn signal bulbs both utilize a 7440NA bulb size for proper operation. The replacement chart covers vehicle production spanning 2004 to 2006 with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 7440NA is the sole bulb type specified for the Lexus ES330, covering both front and rear turn signal positions across the 2004-2006 model years.
The 7440NA follows the ANSI standard, meaning it conforms to the electrical and photometric requirements recognized in the United States and Canada.
This bulb belongs to the T20 wedge family, a single-filament design where the base wedges directly into the socket without a separate metal base or bayonet pins.
The single-filament construction means the 7440NA serves one dedicated function per socket, as opposed to dual-filament bulbs that handle two functions such as braking and turn signaling simultaneously.
The natural amber glass of the 7440NA produces its amber turn signal color through the glass itself rather than through a colored lens or housing, which is a relevant fitment consideration when the housing is clear or white.
Operating at 12 volts and 21 watts, the 7440NA draws a specific current load that the vehicle's turn signal flasher relay is calibrated to recognize; substituting a bulb with a significantly different wattage can cause hyperflashing or irregular flash rates.
The 7440 designation is sometimes confused with the 7443, which is a physically similar T20 wedge bulb but carries a dual-filament design; the two are not interchangeable in single-filament sockets without risking incorrect function or socket damage.
Because the same 7440NA size is specified for both the front and rear positions across all three model years, a single bulb type services all four turn signal sockets on the vehicle.