Generally flips the page (RADF) or scans in one pass (modern DADF). Extremely Fast (Ideal for high volume).

There is no device that uses SPDF calculations to drive a DADF feeder. However, a modern MFP might use a which relies on quantum efficiency (light hitting silicon) – that quantum efficiency is described by SPDF principles.

All SPDFs are duplexing feeders, but not all duplexing feeders (specifically older Reversing Automatic Document Feeders or RADFs) are single-pass. What is a DADF (Duplexing Automatic Document Feeder)?

Before diving into the differences, it is important to understand the base technology. An is the motorized component sits on top of a printer or scanner. Instead of forcing you to lift the lid and place pages down one by one on the glass platen, an ADF allows you to stack a bundle of papers into a tray. The machine then automatically feeds, scans, and ejects each page.

Speed is where an SPDF truly shines. Because it scans both sides in one pass, the rated speed is often given in —the number of sides it can capture each minute. A typical DADF might manage about 55 ipm when scanning double‑sided pages, while an SPDF can reach 80 ipm or even higher .

When looking for the best performance, look for products with "Single-Pass" capabilities, often found in high-end office series like the Xerox VersaLink Canon imageRUNNER Efficiency:

In the context of modern printers and scanners, (Single Pass Document Feeder) and

Because a DADF only requires one scanning sensor and simpler electronics, it is much cheaper to manufacture. MFP models equipped with a DADF are standard across entry-level and mid-tier office copiers, making them highly accessible for small businesses and startups. Cheaper Maintenance and Repairs

is faster and more reliable because it scans both sides in one pass using two scan heads.

There is no universal winner; the "best" choice depends entirely on your office volume, budget, and workflow priorities. Choose a DADF if:

Look for the phrase "Single Pass" or "Dual Scan" in the specifications to ensure you are getting the fastest, most reliable scanning technology. If you're interested, I can: Compare specific printer models that use SPDF. Detail the difference between CIS and CCD sensors. List top brands for high-speed scanners.

Since the paper doesn't have to be pulled back and flipped, there is almost no chance of the paper crumpling or jamming during the "u-turn." 🔄 DADF: The Versatile Choice

When shopping for a modern office copier or multifunction printer (MFP), you will inevitably face a choice between two primary types of automatic document feeders: (Single Pass Document Feeder) and DADF (Duplex Automatic Document Feeder). Choosing the right one directly impacts your office productivity, scanning speed, and long-term budget.

SPDF is the clear winner for speed. Because it scans both sides in one go, there is no physical turning of the page, which significantly reduces the total time required for double-sided jobs. 2. Durability and Paper Jams