Arriving With the Good Cartridges Already Fitted

Most printers in this family ship with standard-yield toner. This one does not: Brother loads the MFC-L8970CDW with high-yield TN635XL cartridges (5,500 pages black, 4,500 per color), a statement about who the machine is for. It is the Workhorse all-in-one — 33 pages per minute printing and copying, an 80-page feeder scanning two-sided at up to 104 images per minute, a legal-size glass, a 7-inch touchscreen with room for 64 shortcuts, and NFC badge authentication under Triple Layer Security.

The supply decision therefore starts a tier up from its siblings, and it has one extra rung at the top.

The Full Ladder, Including the Rung Only This End of the Family Reaches

Cartridge	Yield	Our compatible price*	Cost per page
TN635BK (black)	~3,000 pages	$50.80	≈1.7¢
TN635C / M (each)	~1,800 pages	$50.80	≈2.8¢
TN635Y	~1,800 pages	$47.34	≈2.6¢
TN635XLBK (black)	~5,500 pages	$53.30	≈1.0¢
TN635XLC / M (each)	~4,500 pages	$53.30	≈1.2¢
TN635XLY	~4,500 pages	$46.48	≈1.0¢
TN635XXLBK (black)	~7,500 pages	$76.47	≈1.0¢
TN635XXLC / M / Y (each)	~6,500 pages	$76.47	≈1.2¢
TN637 (each color incl. black)	~10,000 pages	genuine only — see below	—

*Prices checked on our product pages on November 2, 2026; they can change. Yields are Brother's ratings.

About that last row: the TN637 is this machine's party trick, a 10,000-page cartridge in every color — but we do not currently sell a compatible TN637, so it appears here with its yield and no price or link. Everything above it in the table is on our shelf today. Judge the ladder on the numbers: our XL and XXL tiers sit at the same cost per page (about a cent in black), so within what we sell, the choice is interval length, not economy. The standard tier is the only genuinely expensive way to run this printer.

Changing a Cartridge

1. Power stays on. Open the front cover and slide the drum assembly out. 2. Press the green lock lever on the slot the 7-inch display identifies and lift the finished cartridge clear. 3. Rock the new cartridge gently side to side, remove the protective cover, and press it into the slot until it clicks. 4. Slide the assembly home, close the cover, and confirm the new level on the supplies screen.

Every Cartridge We Sell for It, Color by Color

• Black: TN635BK · TN635XLBK · TN635XXLBK
• Cyan: TN635C · TN635XLC · TN635XXLC
• Magenta: TN635M · TN635XLM · TN635XXLM
• Yellow: TN635Y · TN635XLY · TN635XXLY

Sets and Standardization

Restocking is not limited to single cartridges on this flagship: a TN635XL four-color set is stocked at $158.14 — $48.24 below the $206.38 its four cartridges come to individually — and standard and XXL sets mirror it, which suits a department that standardizes on one tier. The working pattern stays the same: pick XL or XXL as the house tier, keep one spare black on the shelf, order colors as the touchscreen forecasts them, and let the set handle the moments when the whole row runs low together. If your organization also runs the MFC-L8930CDW or the HL-L8430 series, the same standard covers them all, because the TN635 tiers are shared across the whole family; only the TN637 stays exclusive to this model, the HL-L8570CDW and the MFC-EX575.

Drum, Belt and Waste Box

One DR635CL drum unit (about 30,000 pages) underpins every tier, TN637 included — upgrading cartridge series never means a different drum. The BU635CL belt unit and WT229CL waste toner box follow at about 50,000 pages each. Our store has no compatible listings for these three parts yet, so they are noted without links; the machine counts each down and warns long before any of them is due.

Frequently Asked Questions

Should I ever buy the standard-yield TN635 for this printer? Only to match a rigid procurement list. It costs roughly triple the XL's price per page in black, and the printer that ships with XL cartridges is telling you the intended tier.

Is the TN637 worth buying as a genuine cartridge? If the machine is remote or serviced on rounds, a 10,000-page cartridge in every slot is the longest leash available and can be worth genuine pricing. At a staffed office, our XXL compatibles reach the same per-page cost territory with 7,500/6,500-page intervals.

Does copying from the feeder wear the drum faster? The drum is rated in printed pages; scanning alone does not consume it, and copies count exactly like prints.

Can the MFC-L8970CDW share cartridges with our MFC-L8730CDW? Yes — all TN635 tiers interchange across the family. The only cartridge that must not travel is the TN637, which the L8730CDW cannot accept.

What paper capacity should we plan around? It starts at 250 sheets plus a 50-sheet multipurpose tray and grows to 1,340 with optional trays — enough that paper, like toner, can be managed on a schedule rather than per-job.

Other Printers That Use TN635

Completing the family: the HL-L8430CDW, HL-L8430CDWT, HL-L8570CDW, MFC-L8730CDW, MFC-L8930CDW and MFC-EX575. Each of them runs on the TN635 tiers linked above; the TN637 line is drawn between this model, the HL-L8570CDW and the MFC-EX575 on one side, and the remaining three on the other.

Our shelf for this machine starts at the MFC-L8970CDW toner page.