Your monitor ships with the components shown in the table below. If any
component is missing, contact Dell technical support. For more information, see
Contact Dell.
NOTE: Some items may be optional and may not ship with your monitor.
Some features may not be available in certain countries.
NOTE: If you are attaching a stand that you purchased from any other
source, follow the set up instructions that were included with the
stand.
Display
Stand riser
6 │ About your monitor
Stand base
Power cable (varies by
country)
DisplayPort cable
(DisplayPort to DisplayPort)
HDMI cable
USB Type-C cable (USB 3.2
Gen1 (5 Gbps))
USB 3.2 Gen1 (5 Gbps)
upstream cable (enables the
USB ports on the monitor)
Cable tie
• Quick Setup Guide
• Safety, Environmental,
and R
egulatory
Information
About your monitor │ 7
Product features
The Del l P3421W monitor has an active matrix, Thin-Film Transistor (TFT), Liquid
Crystal Display (LCD) and LED backlight. The monitor features include:
• 86.72 cm (34.14 in.) viewable area (measured diagonal l y).
3440 x 1440 (21:9) resolution, plus full-screen support for lower resolutions.
• Wide viewing angle to allow viewing from a sitting or standing position.
• Color gamut of 99% sRGB.
• Digital connectivity with DisplayPort, USB Type-C and HDMI.
• Single USB Type-C to suppl y power (PD 65 W) to a compatib le notebook
while receiving video & data signal.
• Tilt, swivel, height, and slant adjustment capabilities.
• Ultra-thin bezel minimizes the bezel gap in multi-monitor usage, enabling
easier setup with an elegant viewing experience.
• Removable stand and Video Electronics Standards Association (VESA™)
100
mm mounting holes for flexible mounting solutions.
• Equipped with 1 USB Type-C upstream port, 1 USB Type B upstream port, and
4 USB Type-A downstream ports.
• Plug and play capabil ity if supported by your system.
• The buil t-in KVM switch allows you to control up to 2 computers from a single
set of keyboard and mouse connected to the monitor.
• Supports Auto KVM for multiple input setup.
• On-Screen Display (OSD) adjustments for ease of set-up and screen
optimization.
• Supports Picture by Picture (PBP) and Picture in Picture (PIP) Select mode.
• Power and joystick buttons lock.
• Security lock slot.
• Stand lock.
• < 0.3 W in Standby Mode.
• Optimize eye comfort with a flicker-free screen.
WARNING: The possible long-term effects of blue light emission from
the monitor may cause damage to the eyes, including eye fatigue,
digital eye strain, and so on. ComfortView feature is designed to reduce
the amount of blue light emitted from the monitor to optimize eye
comfort.
8 │ About your monitor
Identifying parts and controls
Front view
LabelDescription
1Power LED indicator
Solid white light indicates that the mo
normal ly. Blinking white light indicates that the monitor is in Standby
Mode.
nitor is turned on and functioning
About your monitor │ 9
Back view
Back view with monitor stand
LabelDescriptionUse
1VESA mounting holes (100 mm
x 10
0 mm - behind attached
VESA Cover)
2Regulatory labelLists the regulatory approvals.
3Stand release buttonReleases stand from the monitor.
4Barcode, serial number, and
Service T
5Power On/Off buttonTo turn the monitor on or off.
6JoystickUse to control the OSD menu. (For
7Cable-management slotUse to organize cables by inserting
ag label
Wall mount monitor using VESAcompatible wal l mount kit (100 mm x
100 mm).
Refer to this label if you need to
contact Dell for technical support.
mor
e Information, see Operating the
monitor)
them
through the slot.
10 │ About your monitor
Bottom view
Bottom view without monitor stand
LabelDescriptionUse
1Security lock slotSecures the monitor with security lock
(
security lock not included).
2Power connectorConnect the power cable (shipped with your
mon
itor).
3HDMI portConnect your computer with the HDMI cable
(
shipped with your monitor).
4DisplayPortConnect your computer with the DisplayPort
c
able (shipped with your monitor).
5Stand lock featureTo lock the stand to the monitor using a M3 x
6 mm s
6USB Type-C portConnect the USB Type-C cable that came
with
device. This port supports USB Power
Delivery, Data, and DisplayPort video signal.
The USB 3.2 Gen1 (5 Gbps) Type-C port
o
al ternate mode with DP 1.2 supports a
maximum resolution of 3440 x 1440 at 60 Hz,
PD
NOTE: U
versions of Windows prior to Windows 10.
crew (screw not included).
your monitor to the computer or mobile
ffers the fastest transfer rate and the
20 V/3.25 A, 15 V/3 A, 9 V/3 A, 5 V/3 A.
SB Type-C is not supported on
About your monitor │ 11
7
SuperSpeed USB1
5
Gbps (USB 3.2 Gen1)
upstream port
1
8USB 2.0 downstream
port (2)
Connect the USB cable that came with your
monitor to the computer. Once this cable is
connected, you can use the USB connectors
on the monitor.
Connect your USB 2.0 device.*
NOTE: To use these ports, you must connect
the USB cable (shipped with your monitor) to
the USB-upstream port on the monitor and
to your computer.
9SuperSpeed USB
5
Gbps (USB 3.2 Gen1)
downstream port (2)
Connect your USB 3.2 Gen1 (5 Gbps)
2
device.
NOTE: To use these ports, you must connect
the USB cable (shipped with your monitor) to
the USB-upstream port on the monitor and
to your computer.
1
Pending USB-IF compliance certification.
2
To avoid signal interference, when a wireless USB device has been connected to a
USB downstream port, it is NOT recommended to connect any other USB devices
to the adjacent port(s).
Monitor specifications
ModelP3421W
Screen typeActive matrix - TFT LCD
Panel technologyIn-Plane Switching Technology
Aspect ratio21:9
Viewable image
Diagonal
Width (active area)
Height (active area)
Tot a l a re a
867.2 mm (34.14 in.)
799.8 mm (31.49 in.)
334.8 mm (13.18 in.)
267773.04 mm2 (415.05 in.2)
Pixel pitch0.2325 mm x 0.2325 mm
Pixel per inch (PPI)109
12 │ About your monitor
Viewing angle178° (vertical) typical
178° (horizontal) typical
Luminance output300 cd/m² (typical)
Contrast ratio1000 to 1 (typical)
Faceplate coatingAnti-Glare with 3H hardness
BacklightWhite LED edgelight system
Response time8 ms (Normal)
5 ms (Fast)
Curvature3800R (typical)
Color depth1.07 billion colors
NOTE: Video output from the USB-C port at maximum resolution 3440 x 1440 at
60
Hz is limited to 16.7 Million colors.
Color gamutsRGB 99%
Connectivity• 1 x DisplayPort version 1.2 (HDCP 2.3)
• 1 x HDMI port version 2.0 (HDCP 2.3)
• 1 x USB Type-C upstream port (Alternate mode with
DisplayPort 1.2, Power Delivery PD up to 65
• 1 x SuperSpeed USB 5 Gbps (USB 3.2 Gen1)
upstream port
• 2 x SuperSpeed USB 5 Gbps (USB 3.2 Gen1)
downstream port
• 2 x USB 2.0 downstream port
Border width (edge of
monitor to active area)
Adjustability
Height adjustable stand
Ti l t
Swivel
Slant adjust
NOTE: Do not mount or use this monitor in portrait (vertical) orientation or
inverse (180°) landscape mount as it may damage the monitor.
8.7 mm (Top)
8.7 mm (Left/Right)
21.9 mm (Bottom)
150 mm
-5° to 21°
-30° to 30°
-4° to 4°
W)*
About your monitor │ 13
Del l Display Manager
comp
atibility
SecuritySecurity lock slot (cable lock sold separately)
*DisplayPort and USB Type-C (Alternate mode with DisplayPort 1.2): HBR2 is
supported.
Easy Arrange and other key features
Resolution specifications
ModelP3421W
Horizontal scan range30 kHz to 85 kHz (automatic)
Vertical scan ra nge48 Hz to 85 Hz (automatic)
Maximum preset resolution3440 x 1440 at 60 Hz
Supported video modes
ModelP3421W
Video display capabilities (HDMI
& Disp
layPort & USB Type-C
alternate mode)
Preset display modes
480p, 480i, 576p, 576i, 720p, 1080i, 1080p
Display modeHorizontal
fr
equency
(kHz)
VESA, 640 x 48031.559.925.2-/+
VESA, 640 x 48037.575.031.5-/-
VESA, 720 x 40031.570.128.3-/+
VESA, 800 x 60037.960.340.0+/+
VESA, 800 x 60046.975.049.5+/+
VESA, 1024 x 76848.460.065.0-/-
VESA, 1024 x 76860.075.078.8+/+
14 │ About your monitor
Vertical
frequency
(Hz)
Pixel
clock
(MHz)
Sync
polarity
(Horizontal
/Vertical)
VESA, 1152 x 86467.575.0108.0+/+
VESA, 1280 x 102464.060.0108.0+/+
VESA, 1280 x 102480.075.0135.0+/+
VESA, 1600 x 120075.060.0162.0+/+
VESA, 1920 x 108067.560.0148.5+/+
VESA, 2560 x 144088.860.0241.5+/-
VESA, 3440 x 144088.860.0319.8+/-
Electrical specifications
ModelP3421W
Video input signalsHDMI 2.0/DisplayPort 1.2*, 600 mV for each differential
l
ine, 100 ohm input impedance per differential pair
AC input vo l tage/
fr
equency/current
100 VAC to 240 VAC / 50 Hz or 60 Hz ± 3 Hz / 1.5 A
(typical)
Inrush current• 120 V: 40 A (Max.) at 0°C (cold start)
• 240 V: 80 A (Max.) at 0°C (cold start)
Power consumption•0.2 W (Off mode)
•0.3 W (Standby Mode)
•31.5 W (On mode)
•126 W (Max.)
•25.29 W (Pon)
• 80.31 kWh (TEC)
1
1
1
2
3
3
*HBR2 is supported.
1
As defined in EU 2019/2021 and EU 2019/2013.
2
Max brightness and contrast setting with maximum power loading on all USB
ports.
3
Pon: Power consumption of On mode as defined in Energy Star 8.0 version.
TEC: Total energy consumption in kWh as defined in Energy Star 8.0 version.
About your monitor │ 15
This document is informational only and reflects laboratory performance. Your
product may perform differently, depending on the software, components and
peripherals you ordered and shall have no obligation to update such information.
Accordingly, the customer should not rely upon this information in making
decisions about electrical tolerances or otherwise. No warranty as to accuracy or
completeness is expressed or implied.
NOTE: This monitor is ENERGY STAR certified.
This product qualifies for ENERGY STAR in the factory
default settings which can be restored by “Factory Reset”
function in the OSD menu. Changing the factory default
settings or enabling other features may increase power
consumption that could exceed the ENERGY STAR specified
limit.
Physical characteristics
ModelP3421W
Signal cable type• Digital: DisplayPort, 20 pins
• Digital: HDMI, 19 pins
• Universal Series Bus: Type-C, 24 pins
• Universal Serial Bus: USB, 9 pins
NOTE: Dell monitors are designed to work optimally with the video cables that
are shipped with your monitor. As Dell does not have control over the different
cable suppliers in the market, the type of material, connector and process used to
manufacture these cables, Dell does not guarantee video performance on cables
that are not shipped with your Dell monitor.
Dimensions (with stand)
Height (extended)541.1 mm (21.30 in.)
Height (compressed)391.1 mm (15.40 in.)
Width815.7 mm (32.11 in.)
Depth237.4 mm (9.35 in.)
Dimensions (without stand)
Height365.4 mm (14.39 in.)
Width815.7 mm (32.11 in.)
Depth58.1 mm (2.29 in.)
16 │ About your monitor
Stand dimensions
Height (extended)433.3 mm (17.06 in.)
Height (compressed)386.5 mm (15.22 in.)
Width307.0 mm(12.09 in.)
Depth237.4 mm (9.35 in.)
Base307.0 mm x 235.0 mm (12.09 in. x 9.25 in.)
Weight
Weight with packaging14.9 kg (32.80 lb)
Weight with stand assembl y and
cables
Weight without stand assembly
(For wall mount or VESA mount
considerations - no cables)
Weight of stand assembly3.6 kg (7.92 lb)
Front frame gloss17 ± 3
10.8 kg (23.89 lb)
6.7 kg (14.85 lb)
About your monitor │ 17
Environmental characteristics
ModelP3421W
Compliant standards
• ENERGY STAR certified monitor
• EPEAT registered where applicable. EPEAT registration varies by country. See
• Arsenic-free glass and Mercury-free for the panel only
Te m p er at u r e
Operating0°C to 40°C (32°F to 104°F)
Non-operating• Storage: -20°C to 60°C (-4°F to 140°F)
Humidity
Operating20% to 80% (non-condensing)
Non-operating• Storage: 10% to 90% (non-condensing)
Altitude
Operating5000 m (16404 ft) (maximum)
Non-operating12192 m (40000 ft) (maximum)
Thermal dissipation• 429.91 BTU/hour (maximum)
or registration status by country.
• Shipping: -20°C to 60°C (-4°F to 140°F)
• Shipping: 10% to 90% (non-condensing)
• 111.74 BTU/hour (typical)
18 │ About your monitor
Pin assignments
DisplayPort connector
Pin
number
1ML3 (n)
2GND
3ML3 (p)
4ML2 (n)
5GND
6ML2 (p)
7ML1 (n)
8GND
9ML1 (p)
10ML0 (n)
11GND
12ML0 (p)
13GND
14GND
15AUX (p)
16GND
17AUX (n)
18Hot Plug Detect
19Re-PWR
20+3.3 V DP_PWR
20-pin side of the
connected signal cable
About your monitor │ 19
HDMI connector
Pin
number
1TMDS DATA 2+
2TMDS DATA 2 SHIELD
3TMDS DATA 2-
4TMDS DATA 1+
5TMDS DATA 1 SHIELD
6TMDS DATA 1-
7TMDS DATA 0+
8TMDS DATA 0 SHIELD
9TMDS DATA 0-
10TMDS CLOCK+
11TMDS CLOCK SHIELD
12TMDS CLOCK-
13CEC
14Reserved (N.C. on device)
15DDC CLOCK (SCL)
16DDC DATA (SDA)
17DDC/CEC Ground
18+5 V POWER
19HOT PLUG DETECT
19-pin side of the
connected signal cable
20 │ About your monitor
Plug and play capability
You can install the monitor in any Plug and Play-compatible system. The monitor
automatically provides the computer system with its Extended Display Identification
Data (EDID) using Display Data Channel (DDC) protocols so that the system can
configure itself and optimize the monitor settings. Most monitor installations are
automatic; you can select different settings if desired. For more information about
changing the monitor settings, see Operating the monitor.
Universal Serial Bus (USB) interface
This section gives you information about the USB ports that are available on the
monitor.
SuperSpeed USB 5 Gbps (USB 3.2 Gen1)
Transfer speedData rateMaximum power supported
Super-Speed5 Gbps5 V/0.9 A (Max, each port)
High speed480 Mbps5 V/0.9 A (Max, each port)
Full speed12 Mbps5 V/0.9 A (Max, each port)
USB 2.0
Transfer speedData rateMaximum power supported
High speed480 Mbps5 V/0.5 A (Max, each port)
Full speed12 Mbps5 V/0.5 A (Max, each port)
Low speed1.5 Mbps5 V/0.5 A (Max, each port)
NOTE: This monitor is SuperSpeed USB 5 Gbps (USB 3.2 Gen1) and
High-Speed USB 2.0 compatible.
USB Type-C
USB Type-CDescription
VideoDisplayPort 1.2*
DataUSB 3.2 Gen1 (5 Gbps)
Power Delivery (PD)Up to 65 W
*HBR2 is supported.
About your monitor │ 21
USB 3.2 Gen1 (5 Gbps) upstream connector
Pin number9-pin side of the connector
1VCC
2D-
3D+
4GND
5SSTX-
6SSTX+
7GND
8SSRX-
9SSRX+
USB 3.2 Gen1 (5 Gbps) downstream connector
Pin number9-pin side of the connector
1VCC
2D-
3D+
4GND
5SSRX-
6SSRX+
7GND
8SSTX-
9SSTX+
22 │ About your monitor
USB 2.0 downstream connector
Pin number4-pin side of the connector
1VCC
2DMD
3DPD
4GND
USB Type-C connector
Pin NumberSignal NamePin NumberSignal Name
A1GNDB1GND
A2TX1+B2TX2+
A3TX1-B3TX2-
A4VBUSB4VBUS
A5CC1B5CC2
A6D+B6D+
A7D-B7D-
A8SBU1B8SBU2
A9VBUSB9VBUS
A10RX2-B10RX1-
A11RX2+B11RX1+
A12GNDB12GND
About your monitor │ 23
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