Brother DS-940DW vs DS-640 – How to Choose?

When it comes to scanning documents on the go, a portable scanner is the best investment. There are a lot of scanner brands and models available in the market, so choosing the right one could be a little tricky.

The Brother DS-940DW and DS-640 are two of the best scanners that offer portability and many advanced features at a reasonable price. So, here we will compare the Brother DS-940DW and DS-640 to help you decide which is a better option for you.

Brother DS-940DW vs DS-640

Brother DS-940DW vs DS-640 – Comparison Table:

FeaturesBrother DS-940DW
Brother DS-940DW vs DS-640
Brother DS-640
Brother DS-940DW vs DS-640
TypePortable Sheetfed scannerPortable Sheetfed scanner
Body ColorWhiteWhite
ModesColor / Black & WhiteColor / Black & White
Scan Speed16 PPM16 PPM
Image SensorDual CISSingle CIS
Display SizeNoNo
Touch ScreenNoN/A
Optical Resolution600 dpi600 dpi
Duplex ScanningYesNo
Single Pass DuplexYesYes
Automatic Image CorrectionYesYes
Overlap DetectionNoYes
Length DetectionYesYes
Mobile SupportYes (iPrint&Scan app)No
InterfaceUSB 3.0, Wi-Fi, and Wi-Fi DirectUSB 3.0
Wi-Fi Standard802.11 b/g/nN/A
Power InputPowered by USB and BatteryPowered by USB
Power Usage (Max.)4.6 Watt2.5 Watt
Power On Sleep Mode (Max.)1.6 Watt1.4 Watt
Operating Temperature5 to 35 °C5 to 35 °C
Operating Humidity20% to 80%20% to 80%
Compatible OSWindows, macOS, LinuxWindows, macOS, Linux
Weight1.54 lbs1.029 lbs
Warranty1 Year1 Year
Dimensions (W x D x H)14.8” x 3.0” x 6.4”14.7 ” x 3 ” x 6.3 “
PriceView on Amazon View on Amazon

Brother DS-940DW vs DS-640 – Similarities

Scan Speed

Both the Brother DS-940DW and Brother DS-640 portable sheetfed scanners offer a scan speed of 16 pages per minute, which is great to have in a portable scanner.

This also ensures that users can quickly and efficiently scan documents, improving productivity and reducing scanning times.


Neither scanner has a display or a touchscreen. The Brother DS-940DW and DS-640 both lack an integrated display.

This means that users must rely on external devices, such as computers or mobile devices, to control the scanner and view scanned images.

Scan Quality

When it comes to scanning quality, then both the Brother DS-940DW and DS-640 deliver high-quality scans with an optical resolution of 600 dpi.

This ensures that scanned images are clear and accurate, making them suitable for a variety of purposes, including archiving, sharing, and printing.

Automatic Image Correction

Both the Brother DS-940DW and DS-640 scanners are equipped with automatic image correction technology. This feature ensures that scanned images are clean and accurate, reducing the need for manual editing and adjustments.

Compatible OS

Windows, macOS, and Linux are all compatible with Brother’s DS-940DW and DS-640 scanners.

Operating Temperature and Humidity

The Brother DS-940DW and DS-640 scanners have an operating temperature range of 5 to 35 °C and a humidity range of 20% to 80%.

Brother DS-940DW vs DS-640 – Differences

Mobile Support

The Brother DS-940DW supports mobile devices through the iPrint&Scan app, allowing users to scan and print documents from their smartphones or tablets.

In contrast, the Brother DS-640 lacks mobile support, which means users must rely on computer or laptop connections for scanning and printing documents.

Connectivity Interface

The Brother DS-940DW offers a versatile set of connectivity options, including USB 3.0, Wi-Fi, and Wi-Fi Direct. This allows users to connect the scanner to a variety of devices and networks, ensuring compatibility and convenience.

In comparison, the Brother DS-640 is limited to USB 3.0 connectivity, which is a major drawback of this scanner.

Duplex Scanning

Duplex scanning is one of the most important features of any scanner as this ensures document scanning from both sides simultaneously without having to turn over the document.

In this regard, the Brother DS-940DW is a better option since it comes with a duplex scanning feature. On the flip side, Brother DS-640 does not come with duplex scanning capabilities.

Power Usage

The Brother DS-940DW has a slightly higher power usage at 4.6 watts compared to the Brother DS-640’s 2.5 watts. This difference may be a consideration for users who are concerned about energy consumption and efficiency.

Image Sensor

The image sensor in the Brother DS-940DW is a dual CIS, which provides improved image quality and color accuracy. The Brother DS-640, on the other hand, comes with a single CIS sensor.

Brother DS-940DW vs DS-640 – Pros and Cons

Brother DS-940DW
Brother DS-940DW vs DS-640
Brother DS-640
Brother DS-940DW vs DS-640
● Mobile Support
● Duplex Scanning Capabilities
● Multiple Connectivity Options
● Dual CIS Image Sensor
● Compact and Lightweight
● Decent Scan Quality
● Automatic Image Correction
● Wide OS Compatibility
● Slightly higher power usage
● Limited connectivity options
● Single CIS Image Sensor
● No Mobile support
 View on Amazon View on Amazon

Brother DS-940DW vs DS-640 – Which One is Better?

The Brother DS-940DW is a way better option in comparison to the Brother DS-640 since it comes with many advanced features which are missing in the Brother DS-640 scanner. For instance, the Brother DS-940W comes with a Dual CIS image sensor, mobile support, multiple connectivity options, and also has duplex scanning support.

Frequently Asked Questions:

Which Brother Scanner Offers Better Portability?

The Brother DS-940W offers better portability since it comes with a built-in battery and doesn’t even need a computer for scanning as it supports mobile scanning.

Can You Scan Credit or Debit Cards in These Scanners?

Yes, you can easily scan credit/debit cards with both of these scanners.

How Accurate Are Brother Scanners?

Brother is a well-known brand in the scanners industry, and its scanners are highly accurate.


In short, if you are confused between the Brother DS-940W and DS-640, then you should go with the Brother DS-940W, especially if you don’t have budget constraints.

However, if you are low on budget, then go with the Brother DS-640, but you will need to compromise with some advanced features.

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