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Samsung Galaxy S5 vs Samsung Galaxy A21 vs LG K51

Compare phone and tablet specifications of up to three devices at once.

Display

Size:

5.1 inches
6.5 inches
6.5 inches

Resolution:

1920 x 1080 pixels, 432 PPI
1600 x 720 pixels, 20:9 ratio, 270 PPI
1560 x 720 pixels, 19.5:9 ratio, 264 PPI

Technology:

Super AMOLED
IPS LCD
IPS LCD

Screen-to-body:

69.76 %
79.20 %
79.70 %

Colors:

16 777 216

Touchscreen:

Capacitive, Multi-touch

Features:

Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor
60Hz refresh rate, Ambient light sensor, Proximity sensor
Ambient light sensor, Proximity sensor

Hardware

System chip:

Qualcomm Snapdragon 801 MSM8974-AC
Mediatek Helio P35
MediaTek Helio P22 MT6762

Processor:

Quad-core, 2500 MHz, Krait 400, 32-bit, 28 nm
Octa-core, 2300 MHz, Arm Cortex-A53, 64-bit, 12 nm
Octa-core, 2000 MHz, Arm Cortex-A53, 64-bit, 12 nm

GPU:

Adreno 330
PowerVR GE8320
IMG PowerVR GE8320

RAM:

2GB LPDDR3
3GB LPDDR4
3GB

Internal storage:

32GB
32GB (eMMC 5.1), available to use: 19.8 GB
32GB, available to use: 18 GB

Storage expansion:

microSDXC up to 128 GB
microSDXC up to 512 GB
microSDXC up to 2000 GB

Device type:

Smartphone
Smartphone
Smartphone

OS:

Android (6.0 Marshmallow, 5.1 Lollipop, 5.0 Lollipop, 4.4.4, 4.4.2), Samsung TouchWiz UI
Android (10), Samsung One UI
Android (10)

Battery

Capacity:

2800 mAh
4000 mAh
4000 mAh

Type:

Li - Ion, User replaceable
Li - Polymer, Not user replaceable
Li - Ion, Not user replaceable

Charging:

Fast charging

Max charge speed:

Wired: 15.0W

Camera

Rear:

Single camera
Quad camera
Triple camera

Main camera:

16 MP (BSI sensor, PDAF)
16 MP (PDAF)
13 MP (PDAF)

Specifications:

Aperture size: F2.2; Focal length: 31 mm; Sensor size: 1/2.6"; Pixel size: 1.12 μm
Aperture size: F1.8; Sensor size: 1/3.06"; Pixel size: 1 μm
Aperture size: F1.8; Sensor size: 1/3"; Pixel size: 1.12 μm

Second camera:

8 MP (Ultra-wide)
5 MP (Ultra-wide)

Specifications:

Aperture size: F2.2; Sensor size: 1/4"; Pixel size: 1.12 μm
Aperture size: F2.2; Sensor size: 1/5"; Pixel size: 1.12 μm

Third camera:

2 MP (Macro)
2 MP (Depth information)

Specifications:

Aperture size: F2.4
Sensor size: 1/5"; Pixel size: 1.75 μm

Fourth camera:

2 MP (Depth information)

Specifications:

Aperture size: F2.4

Video recording:

3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (60 fps)
1920x1080 (Full HD) (30 fps)
1920x1080 (Full HD)

Features:

HDR, Continuous autofocus, EIS, Video calling, Video sharing
Picture-taking during video recording

Front:

2.1 MP
13 MP
13 MP

Video capture:

1920x1080 (Full HD)
1920x1080 (Full HD)
1920x1080 (Full HD)

Design

Dimensions:

5.59 x 2.85 x 0.32 inches (142 x 72.5 x 8.1 mm)
6.61 x 3.02 x 0.32 inches (167.8 x 76.7 x 8.1 mm)
6.57 x 3.07 x 0.33 inches (166.9 x 77.9 x 8.4 mm)

Weight:

5.11 oz (145.0 g)
6.81 oz (193.0 g)
7.17 oz (203.4 g)

Materials:

Back: Plastic
Back: Plastic; Frame: Plastic

Resistance:

Water, Dust; IP67
Yes; MIL-STD-810 certified

Biometrics:

Fingerprint (swipe)
Fingerprint (touch)
Fingerprint (touch)

Features:

Touch sensitive control keys, Interchangeable covers, Notification light

Keys:

Left: Volume control; Right: Lock/Unlock key
Right: Volume control, Lock/Unlock key
Left: Volume control; Right: Lock/Unlock key

Colors:

Black, Gold, Blue, White
Black
Titan gray

Cellular

LTE (FDD):

Bands 1(2100), 2(1900), 3(1800), 5(850), 7(2600), 8(900), 20(800 DD)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 17(700 b), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 66(AWS-3), 71(600)
Bands 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 12(700 a), 13(700 c), 20(800 DD), 25(1900+), 26(850+), 66(AWS-3), 71(600)

LTE (TDD):

Bands 38(2600), 39(1900+), 40(2300), 41(2600+)
Bands 41(2600+)

UMTS:

850, 900, 1900, 2100 MHz
850, 900, 1700/2100, 1900, 2100 MHz
850, 900, 1700/2100, 1900, 2100 MHz

Data Speed:

LTE Cat 4 (150/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s, UMTS
LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s

SIM type:

Micro SIM
Nano SIM
Nano SIM

HD Voice:

Yes
Yes

VoLTE:

Yes
Yes

Multimedia

Headphones:

3.5mm jack
3.5mm jack
3.5mm jack

Speakers:

Earpiece, Loudspeaker
Earpiece, Loudspeaker
Earpiece, Multiple speakers

Features:

Album art cover, Background playback
DTS:X Virtual Surround

Screen mirroring:

MHL
Wireless screen share
Wireless screen share

Radio:

FM
FM

Additional microphone(s):

for Noise cancellation, Video recording
for Noise cancellation

Connectivity & Features

Bluetooth:

4.0
5.0
5.0

Wi-Fi:

802.11 a, b, g, n, ac, dual-band; Multiple antennas, MIMO, Hotspot, Wi-Fi Direct
802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot
802.11 a, b, g, n, ac, dual-band; Wi-Fi Direct, Hotspot

USB:

microUSB, USB 3.0
Type-C (reversible), USB 2.0
Type-C (reversible), USB 2.0

Features:

Mass storage device, OTG, Charging, Video out
Charging
Charging

HDMI:

Yes

Location:

GPS, A-GPS, Glonass
GPS, A-GPS, Glonass, BeiDou, Cell ID, Wi-Fi positioning
GPS, A-GPS, Cell ID, Wi-Fi positioning

Sensors:

Accelerometer, Gyroscope, Pedometer, Compass, Hall (for flip covers), Gesture, Barometer, Step detector, Step counter
Accelerometer, Gyroscope, Compass
Accelerometer, Gyroscope, Compass

Other:

NFC, ANT+, Infrared, Tethering, Computer sync, OTA sync
NFC

Hearing aid compatible:

M4, T3
M3, T3

Phone features

Notifications:

Haptic feedback, (MP3)

Other features:

Voice dialing, Voice commands, Voice recording

Regulatory Approval

FCC approval:

Date approved:

Apr 17, 2020

FCC ID value:

ZCASMA215U link

Measured SAR:

Head:

0.42 W/kg

Body:

1.27 W/kg

Simultaneous Transmission:

1.27 W/kg

Wireless Router:

1.27 W/kg

Buyers information

Price:

$ 250
$ 200

User Manual:

This is the official LG K51 User Guide in English provided from the manufacturer.

In The Box:

This is the official Samsu​ng Galaxy A21 User Guide in English provided from the manufacturer.
Charger, USB Cable, SIM Ejector

Availability

Officially announced:

Feb 24, 2014
Apr 08, 2020
May 06, 2020
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