Our take
The Brother MFC-8840DN is a legacy monochrome laser all-in-one for a wired office that needs print, copy, color scan, and fax in one chassis. Brother rates it up to 21 pages per minute on Letter and documents automatic duplex for printing, copying, and fax reception. A 50-sheet ADF supports stacks of originals, while standard input is 250 sheets and output is 150. Its DN configuration includes 10/100BaseTX Ethernet, USB 2.0, and parallel. Brother does not establish duplex scanning through the ADF, and the saved sources give no recommended monthly range or current support and supply status.
A legacy wired office needing fax and automatic two-sided output with a feeder for single-sided originals..
Choose another device if you need confirmed one-pass duplex scanning, wireless networking, a known current driver and parts path, or a published monthly workload recommendation.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- The exact model combines monochrome print, copy, color scan, and fax with standard wired Ethernet.
- Brother specifies automatic duplex for print output, copying, and fax reception, reducing paper handling in those workflows.
- A 50-sheet ADF and 250-sheet standard input support more than occasional single-page desk use.
What to weigh up
- The sources do not establish duplex scanning through the ADF, so two-sided originals may need manual handling.
- This is an older discontinued design, and present parts, toner, driver compatibility, and unit condition are unknown.
- Brother does not provide a comparable recommended monthly-volume range in the saved exact-model materials.
The key details
| Model covered | MFC-8840DN |
|---|---|
| Main functions | Monochrome print, copy, color scan, and fax |
| Print output | Up to 21 ppm Letter |
| Two-sided printing | Automatic duplex for printing; 250-sheet input and 150-sheet output |
Performance figures are manufacturer claims. Source checked October 4, 2026. Regional models and included accessories can differ.
What the features mean for you
The DN suffix identifies a networked fax MFP
Brother's exact MFC-8840DN material lists monochrome printing, copying, color scanning, and fax. The product description distinguishes the DN from the MFC-8840D sibling by its built-in network feature. That is useful for a wired shared office, but it makes the full suffix important when evaluating a listing or replacement chassis. The machine does not provide color print output; color is supported for scanning. Buyers who need color pages should choose a different model rather than interpreting color scan as color printing.
Automatic duplex covers output, not proven ADF scanning
Brother documents automatic duplex for print jobs and copying, and lists duplex reception for fax. These functions allow the machine to turn sheets for supported output tasks. The 50-sheet ADF is a separate input path, and the saved Brother scanner fields do not establish automatic duplex scanning through that feeder. A buyer handling two-sided contracts or archival originals should plan for manual page turns unless the exact device or documentation confirms another scan feature. Do not infer one-pass scanning from the duplex copy specification.
A feeder and optional tray serve recurring paper work
The standard input holds 250 sheets and output holds 150. Brother documents an optional lower tray that can expand input to 500 sheets; that accessory is not part of the standard capacity and should be checked on an individual listing. The 50-sheet ADF reduces hand placement for multi-page single-sided originals, but it does not answer every scan workflow question. Compare the actual volume of printing, copying, and faxing with the tray supply and inspect feed rollers, duplex operation, and the optional tray if included.
The interface set is wired and includes legacy ports
Brother lists 10/100BaseTX Ethernet, full-speed USB 2.0, and a parallel interface. Ethernet gives the MFC-8840DN a documented route onto a wired office network, while USB or parallel can serve direct connection environments. Built-in Wi-Fi is not listed in the saved interface set. The sources also do not establish compatibility with a present-day operating system or managed network, so verify the intended host and security setup before depending on this older product. Do not treat a separate print server as an included wireless radio.
Ownership depends on the particular machine
The historical Amazon page returned an internal error, so this guide uses a tagged exact-model search rather than claiming that an old ASIN identifies the MFC-8840DN. The manufacturer material establishes its original feature set but does not establish present condition, remaining toner, service history, or support availability. Ask for the label, port panel, feeder, fax operation, and sample duplex output to be checked on the actual device. Those are pre-purchase checks, not tests performed for this review. Brother does not state a recommended monthly volume in the saved source set.
What else to compare
Compare the Brother MFC-L5800DW for a newer documented monochrome fax workflow, or select a model with confirmed duplex ADF scanning when two-sided capture is central.
Before you buy
Does the MFC-8840DN print on both sides automatically?
Yes. Brother lists automatic duplex for print output on the exact MFC-8840DN model.
Can its ADF be assumed to scan both sides at once?
No. The saved Brother scanner fields do not establish duplex scanning through the 50-sheet feeder.
Does the DN model include wired networking?
Yes. Brother identifies built-in 10/100BaseTX Ethernet on the MFC-8840DN, separate from the MFC-8840D sibling.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- Brother MFC-8840DN U.S. specifications ↗ — checked October 4, 2026.
- Brother MFC-8840DN U.S. specifications, general, fax, print, copy and scanner fields ↗ — checked October 4, 2026.
- Brother product description, model category and built-in-network distinction ↗ — checked October 4, 2026.
- Search this model on Amazon · Tagged exact-model Amazon search; historical ASIN association remains unverified ↗Paid link · We may earn a commission. — checked October 4, 2026.
The decision
The MFC-8840DN's best-defined role is legacy wired fax and document handling with automatic output duplex. Its ADF scan limits and unknown current support make the exact workflow and unit history decisive.
Is it the right fit?
Check the exact model and today’s offers on Amazon.