General Specifications

Memory Capacity

DSmobile DS-635/DSmobile DS-640: 128 MB

DSmobile DS-740D: 256 MB

DSmobile DS-940DW: 512 MB

Power Source

DSmobile DS-635/DSmobile DS-640/DSmobile DS-740D: USB bus-power

DSmobile DS-940DW: USB bus-power/rechargeable Li-ion battery

Power Consumption *1

DSmobile DS-635/DSmobile DS-640: Approx. 2.6 W

DSmobile DS-740D: Approx. 3.3 W

DSmobile DS-940DW:

  • Approx. 4.6 W (Wi-Fi Mode)
  • Approx. 4.2 W (USB Mode)


DSmobile DS-635/DSmobile DS-640: Approx. 1.4 W

DSmobile DS-740D: Approx. 1.4 W

DSmobile DS-940DW *2:

  • Approx. 2.3 W (Wi-Fi Mode)
  • Approx. 1.6 W (USB Mode)

Power Down

DSmobile DS-635/DSmobile DS-640: Approx. 0.01 W

DSmobile DS-740D: Approx. 0.01 W

DSmobile DS-940DW *2: Approx. 0.11 W


DSmobile DS-635/DSmobile DS-640:


DSmobile DS-740D:


DSmobile DS-940DW:



DSmobile DS-635/DSmobile DS-640: Approx. 1.03 lbs (466 g)

DSmobile DS-740D: Approx. 1.43 lbs (646 g)

DSmobile DS-940DW: Approx. 1.54 lbs (699 g)


41°F to 95°F (5°C to 35°C) *3


-4°F to 140°F (-20°C to 60°C)


20% to 80%


10% to 90%

Measured when the machine is connected to the USB interface.
(DSmobile DS-940DW) Measured when the rechargeable Li-ion battery is fully charged.
(DSmobile DS-940DW) Charging stops when the temperature of the specifications is exceeded.

Document Specifications

Paper Type
Photo, Paper, Card (embossed), Business Card, Receipt
Document Size

DSmobile DS-635/DSmobile DS-640:

  • 3.4 in. x 2.0 in. to 72 in. x 8.5 in. (86.4 mm x 50.8 mm to 1828.8 mm x 215.9 mm)

DSmobile DS-740D/DSmobile DS-940DW:

  • Single-sided Scan

    3.4 in. x 2.0 in. to 72 in. x 8.5 in. (86.4 mm x 50.8 mm to 1828.8 mm x 215.9 mm)

  • 2-sided Scan

    3.4 in. x 2.0 in. to 16 in. x 8.5 in. (86.4 mm x 50.8 mm to 406.48 mm x 215.9 mm)

  • Output Guide

    4.13 in. x 2.91 in. to 11.69 in. x 8.5 in. (105 mm x 74 mm to 297 mm x 215.9 mm)

Scanner Specifications



TWAIN Compliant

Windows 7 (SP1) / Windows 8.1 / Windows 10

Windows Server 2012 / Windows Server 2012 R2 / Windows Server 2016 / Windows Server 2019

WIA Compliant

Windows 7 (SP1) / Windows 8.1 / Windows 10

ICA Compliant

macOS v10.12.x / v10.13.x / v10.14.x *1

Color Depth

48 bit color processing


24 bit color processing


Up to 1200 x 1200 dpi


Up to 600 x 600 dpi

Scanning Width

Up to 8.5 in. (215.9 mm)

Gray Scale

256 levels

Max. Speed

See your model’s page on your local Brother website.

For the latest macOS driver updates, visit

Rechargeable Li-ion Battery (DSmobile DS-940DW)

Charging Time
2.6 hours
Continuous Standby Time
10 minutes (when the Auto Power Off feature is active)
Scannable Number of Sheets (WLAN ON)
200 sheets
Scannable Number of Sheets (WLAN OFF)
320 sheets
  • The numbers described in the Rechargeable Li-ion Battery table may differ depending on the documents scanned and on environmental factors, such as temperature and the charging and discharging method.
  • For longer battery life, turn the scanner off when you are not using it.

Interface Specifications


USB 3.0 *1

Use a USB 3.0 cable (Standard A/Micro B) or USB 2.0 interface cable (Standard A/Micro B) that is no more than 6 feet (2.0 meters) long.

Memory Card

(DSmobile DS-940DW)

microSD memory card: 2 GB - 32 GB (SDHC)

Wireless LAN

(DSmobile DS-940DW)

IEEE 802.11b/g/n (Infrastructure mode)

IEEE 802.11g (Wireless Direct)


Your machine has a USB 3.0 interface. The machine can also be connected to a computer that has a USB 2.0 interface.

Third-party USB ports are not supported.

Network Specifications (DSmobile DS-940DW)

Wireless Network Security

WEP 64/128 bit, WPA-PSK (TKIP/AES), WPA2-PSK (AES)

Setup Support Utility


WLAN Assistant

Supported Protocols and Security Features (DSmobile DS-940DW)

Protocol (IPv4)

DHCP, APIPA (Auto IP), WINS/NetBIOS, DNS Resolver, mDNS, SNMPv1/v2c, ICMP, Web Services (Scan), HTTP/HTTPS server, LLMNR responder, SNTP Client

Protocol (IPv6)

RA, DNS Resolver, mDNS, LLMNR responder, Web Services (Scan), SNTP Client, HTTP/HTTPS server, ICMPv6

Network Security (Wireless)


Wireless Certification

Wi-Fi Certification Mark License (WPA/WPA2 - Personal), Wi-Fi Protected Setup (WPS) Identifier Mark License