HP Q5945A

A multifunction machine still needs just one toner cartridge when it is monochrome, and for the LaserJet 4345 family that cartridge is the Q5945A (45A). Printing, copying and faxing all draw from the same black toner supply, and every configuration — the base LaserJet 4345, the LaserJet 4345MFP and the extended XMFP builds — accepts the identical unit. A high-yield Q5945X (45X) stretches the supply to about 24,000 pages per cartridge, so high-volume sites swap less often. All listings here are Clever Supplies compatibles with a 1-year warranty and 1-year returns.

Consolidating four office functions onto one supply has a quiet operational benefit: the busiest machine on the floor has exactly one consumable to run out of, and one spare on the shelf stands between it and any downtime. Facilities teams feel this most during peak periods — a copying surge and a fax surge draw on the same cartridge, so there is no version of events where the printer has toner for one job but not another. One cartridge, four functions, and a supply routine a new hire can learn in a single walkthrough.

Toner Cartridges for HP Q5945A

Q5945A (45A) Toner Cartridge Black — single — Black — See product page
Q5945A Toner Cartridge Black MICR — single — Black — See product page
Q5945A Premium Quality Toner Cartridge Black — single — Black — See product page
Q5945X (45X) Toner Cartridge Black Maximum Yield — single — Black — About 24,000 pages
LaserJet 4345 Toner Cartridge Black — model-named single — Black — See product page

Which cartridge should you buy?

The standard Q5945A fits a 4345 that does honest but unhurried work — a department's second machine, or one whose copying load is light. The decision changes with traffic: because every function drinks from this one cartridge, a busy MFP empties it faster than a plain printer would, and that is where the Q5945X earns its place. At about 24,000 pages — a rating measured at 5% page coverage, so dense documents finish sooner — it is built for the machine everyone queues at. The Premium standard single suits buyers who want the upgraded build without stepping up in capacity, and the MICR single is reserved for check printing.

Chip, toner and everyday use

These MFPs authenticate the cartridge chip and report toner levels from it, so a compatible with a properly matched chip installs and registers like the original supply. When the low-toner warning appears, the machine typically still has a comfortable window before output actually degrades — use it to get the spare out of the closet rather than waiting for visible fading. Fitting a new cartridge is a front-door job: sealing tape off, unit in firmly, done. Keep the spare sealed, cool and dry; on a shared floor machine, writing the install date on the box is a small habit that makes consumption patterns obvious at a glance.

Frequently Asked Questions

My machine copies and faxes too — does this cartridge cover those, or do I need other supplies?

This cartridge covers everything the machine does. The 4345 family is monochrome, so printing, copying and fax output all draw on the same black toner. It is the printer's only consumable — there is no second supply hiding behind any of its functions.

Will a compatible cartridge pass the machine's chip checks?

A quality compatible includes a chip the machine recognizes, so the cartridge is accepted and toner levels report normally. That is the design intent of the listings here: the printer sees a valid supply and gets on with its work, and the operator sees honest level readings instead of errors.

This is our busiest machine — how should we manage its supply?

Step up a size and stock in depth. Run the high-yield cartridge in the busiest unit — its roughly 24,000-page capacity is made for exactly that queue — and keep at least one spare sealed nearby at all times. When the low-toner warning shows, you still have a window to swap on your schedule rather than the machine's.

What is the Premium listing on this page?

It is the standard-yield cartridge in an upgraded build — same capacity class as the regular single, positioned for buyers who prefer the premium construction. If your machine's workload is the problem, the high-yield cartridge is the more direct answer; if build preference is the question, the Premium single is the one to compare.