TO-273AA Component Package

TO-273AA (Transistor Outline 273AA) is a through-hole component package.

The TO-273AA (also known as the Super-220) can be considered a variant of the TO-220 which replaces the screw-mounted design of the TO-220 with a clip-mounted design. Because of the clip, this package can usually achieve lower junction-to-ambient thermal resistances, hence the “Super”. It is used by International Rectifier.

Synonyms

• Super TO-220: International Rectifier.

3D Render

A 3D render of the TO-273AA (Super TO-220) component package. Image from http://www.irf.com/part/INTELLIGENT-POWER-SWITCH-1-CHANNEL-LOW-SIDE-DRIVER-IN-A-SUPER-220-TO-273AA-PACKAGE/_/A~IPS0551T.

Dimensions

The case outline and dimensions of the TO-273AA component package (Super TO-220). Image from http://www.irf.com/product-info/datasheets/data/ips0551t.pdf.

Pitch is 2.54mm (100mil).

Height is approx. 20.5mm when mounted vertically, with pins pushed into PCB until they hit the taper.

Thermal Resistance

• $T_{JC} = 0.7^{\circ}{\rm C}/W$
• $T_{JA} = 60^{\circ}{\rm C}/W$ (min. PCB footprint)
• $T_{JA} = 35^{\circ}{\rm C}/W$ (1” sq. PCB footprint)

All of the above values are from the IPS0551T MOSFET datasheet¹.

Similar To

• TO-220: TO-220 is a more popular screw-mounted package that looks like this TO-273AA.

Footnotes

1. International Rectifier. IPS0551T - Fully Protected Power MOSFET Switch. Retrieved 2024-04-21, from https://www.irf.com/product-info/datasheets/data/ips0551t.pdf. ↩