LaserJet 5SI

Launched in 1996, the HP LaserJet 5Si was the A3-capable workgroup tank of its generation — a big, fast monochrome laser built to anchor a busy office's print queue. Departments that needed tabloid-size output and serious duty cycles leaned on the 5Si for years.

Its cartridge is the HP 09A, part number C3909A. We stock compatible 09A toner for high-volume value and genuine OEM C3909A cartridges for factory-spec output on this classic workhorse.

Toner Cartridges for LaserJet 5SI

This printer works with the following toner cartridges:

HP C3909A

More HP Printers

Frequently Asked Questions

Can I use a compatible HP 09A cartridge in the HP LaserJet 5SI?

Yes — compatible HP 09A cartridges are built to the same fit and function as the OEM C3909A for the HP LaserJet 5SI. They install exactly the same way and are a straightforward way to spend less on toner for the HP LaserJet 5SI.

What should I do when the HP LaserJet 5SI shows a toner-low warning?

A toner-low alert on the HP LaserJet 5SI is an early heads-up, not a stop sign. Reorder the C3909A now, redistribute the current HP 09A cartridge, and keep printing on the HP LaserJet 5SI until quality actually drops.

Where can I still buy toner for the HP LaserJet 5SI?

You can still buy C3909A toner for the HP LaserJet 5SI from office-supply retailers and online — it is a mainstream cartridge, not a rare one. Check that the box lists the HP LaserJet 5SI or the HP 09A code and you are set.