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HP 645A Magenta Toner Cartridge

Magenta · Standard yield

Color
Magenta
Yield
Standard yield
Type
Genuine HP
Part number
C9733A
$871 CAD

Volume discount at checkout: 1% over $100 · 2% over $1,000 · 3% over $5,000

1

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Ships within 7 business days.

Brand new, US modelFull HP manufacturer warranty
Genuine or compatibleOriginal cartridges, or compatible toner that costs less
30-day returnsUnopened, in original packaging

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ColorMagenta
YieldStandard yield
TypeGenuine HP
Part numberC9733A
Overview

About the HP 645A Magenta Toner Cartridge

Genuine HP drum unit, part number C9733A. Color: Magenta.

Works with: HP Color LaserJet 5500, HP Color LaserJet 5550.

Original HP supplies give the most consistent print quality and keep your printer warranty intact.

Not sure it fits? Check the model name on the front of your printer, or send us the model and we will confirm before you order.

Learn before you buy

Understanding the HP 645A

What this is

A drum unit (also called an imaging drum) is the part of a laser printer that transfers toner onto paper. It is not the toner. A drum usually lasts through several toner cartridges, so you replace it far less often.

Genuine (also called OEM or original) means made by HP. It gives the most consistent quality and color, and it is what the manufacturer designs and tests the printer with.

Page yield & cost per page

~12,000 pages · about 7.3¢ per page

Page yield is how many pages a cartridge prints in the industry-standard test (ISO/IEC 19752). That test prints pages with about 5% coverage, roughly a short business letter. Pages full of photos or dark graphics use more, so your real count may be lower.

Cost per page = price ÷ page yield. It is the fairest way to compare cartridges. High-yield (often marked X or XL) versions usually cost less per page. How yield works

How to install it

  1. Open the front cover and pull out the toner-and-drum assembly.
  2. Press the lock lever and lift the toner cartridge out of the old drum.
  3. Unpack the new drum and remove the protective cover. Don't touch the green or blue drum surface.
  4. Click the toner cartridge into the new drum until it locks.
  5. Slide the assembly back in, close the cover and reset the drum counter from the printer menu (see the manual for your model).

Get more pages for your money

  • Don't swap at the first "low" warning. Most printers warn early. Keep printing until pages actually fade.
  • Use draft or toner-save mode for internal documents and printing you don't need to look sharp.
  • Faded pages? Take the cartridge out and rock it gently. It often gives you dozens more pages.
  • Buy in pairs. Keeping one spare means you never stop mid-job, and larger orders get our volume discount.

Storage & shelf life

Keep spare cartridges sealed in their bag, lying flat, at room temperature and out of direct sunlight. Most are best used within about two years. Check the date on the box. Once opened, install the cartridge right away.

Will it fit my printer?

Match the cartridge number (this one is part number C9733A) or your exact printer model, found on the front or top of the printer. Models that differ by one letter often take different cartridges.

Find my toner · Ask us to confirm

Guides

Setup guides and answers

Browse all guides →