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LG K51 vs Samsung Galaxy A42 vs Samsung Galaxy A51 5G

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

Comparison mode:

Display

Size:

6.5 inches
6.6 inches
6.5 inches

Resolution:

1560 x 720 pixels, 19.5:9 ratio, 264 PPI
1600 x 720 pixels, 20:9 ratio, 266 PPI
2400 x 1080 pixels, 20:9 ratio, 405 PPI

Technology:

IPS LCD
Super AMOLED
Super AMOLED

Refresh rate:

60Hz
60Hz

Screen-to-body:

79.70 %
84.26 %
87.37 %

Features:

Ambient light sensor, Proximity sensor
Ambient light sensor, Proximity sensor
Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor

Hardware

System chip:

MediaTek Helio P22 MT6762
Qualcomm Snapdragon 750G SM7225
Samsung Exynos 980

Processor:

Octa-core, 2000 MHz, Arm Cortex-A53, 64-bit, 12 nm
Octa-core, 2200 MHz, Kryo 570, 64-bit, 8 nm
Octa-core, 2200 MHz, ARM Cortex-A77 and ARM Cortex-A55, 64-bit, 8 nm

GPU:

IMG PowerVR GE8320
Adreno 619
Mali-G76 MP5

RAM:

3GB
4GB LPDDR4
6GB LPDDR4

Internal storage:

32GB, available to use: 18 GB
128GB, available to use: 106 GB
128GB, available to use: 105.3 GB

Storage expansion:

microSDXC up to 2000 GB
microSDXC up to 1000 GB
microSDXC up to 1000 GB

Device type:

Smartphone
Smartphone
Smartphone

OS:

Android (10)
Android (11, 10), Samsung One UI
Android (11, 10), Samsung One UI

Battery

Capacity:

4000 mAh
5000 mAh
4500 mAh

Type:

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

Charging:

Samsung Adaptive Fast Charging
Fast charging

Max charge speed:

Wired: 15.0W
Wired: 25.0W

Camera

Rear:

Triple camera
Quad camera
Quad camera

Main camera:

13 MP (PDAF)
48 MP (PDAF)
48 MP (PDAF)

Specifications:

Aperture size: F1.8; Sensor size: 1/3"; Pixel size: 1.12 μm
Aperture size: F1.8; Pixel size: 0.8 μm
Aperture size: F2.0; Focal length: 26 mm; Sensor size: 1/2"; Pixel size: 0.8 μm

Second camera:

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

Specifications:

Aperture size: F2.2; Sensor size: 1/5"; Pixel size: 1.12 μm
Aperture size: F2.2
Aperture size: F2.2; Focal Length: 13 mm; Pixel size: 1.12 μm

Third camera:

2 MP (Depth information)
5 MP (Macro)
5 MP (Macro)

Specifications:

Sensor size: 1/5"; Pixel size: 1.75 μm
Aperture size: F2.4
Aperture size: F2.4; Focal Length: 40 mm

Fourth camera:

5 MP (Depth information)
5 MP (Depth information)

Specifications:

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

Video recording:

1920x1080 (Full HD)
3840x2160 (4K UHD) (30 fps), 1280x720 (HD) (480 fps)
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (480 fps)

Features:

Picture-taking during video recording
Hyperlapse, EIS

Front:

13 MP
20 MP (Autofocus)
32 MP (HDR)

Video capture:

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

Design

Dimensions:

6.57 x 3.07 x 0.33 inches (166.9 x 77.9 x 8.4 mm)
6.47 x 2.99 x 0.34 inches (164.4 x 75.9 x 8.6 mm)
6.26 x 2.90 x 0.34 inches (158.9 x 73.6 x 8.7 mm)

Weight:

7.17 oz (203.4 g)
6.81 oz (193.0 g)
6.60 oz (187.0 g)

Materials:

Back: Plastic; Frame: Aluminum

Resistance:

Yes; MIL-STD-810 certified

Biometrics:

Fingerprint (touch)
In-screen fingerprint
2D Face unlock, In-screen fingerprint

Keys:

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

Colors:

Titan gray
Prism Dot black, Prism Dot white, Prism Dot grey
Prism cube black

Cellular

5G:

n1, n3, n5, n7, n8, n28, Sub-6
n41, n71, SA, NSA

LTE (FDD):

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)
Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 17(700 b), 20(800 DD), 28(700 APT)
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)

LTE (TDD):

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

UMTS:

Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)
Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)
Bands 1(2100), 2(1900), 4(1700/2100), 5(850)

Data Speed:

LTE-A Cat 6 (300/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
LTE-A Pro Cat 16 (1000/150 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s

Dual SIM:

Shared with microSD

SIM type:

Nano SIM
Nano SIM

HD Voice:

Yes
Yes

VoLTE:

Yes

Multimedia

Headphones:

3.5mm jack
3.5mm jack
3.5mm jack

Speakers:

Earpiece, Multiple speakers
Earpiece, Loudspeaker
Earpiece, Loudspeaker

Features:

DTS:X Virtual Surround
Dolby Atmos

Screen mirroring:

Wireless screen share
Wireless screen share
Wireless screen share

Radio:

FM
FM

Additional microphone(s):

for Noise cancellation
for Noise cancellation

Connectivity & Features

Bluetooth:

5.0
5.0
5.0

Wi-Fi:

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

USB:

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

Features:

Charging
Charging
Charging, OTG

Location:

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

Sensors:

Accelerometer, Gyroscope, Compass
Accelerometer, Gyroscope, Compass
Accelerometer, Gyroscope, Compass, Hall (for flip covers)

Other:

NFC
NFC, ANT+

Hearing aid compatible:

M3, T3
M3, T3

Regulatory Approval

FCC approval:

Date approved:

Jun 16, 2020
Apr 08, 2021
Jul 15, 2020

FCC ID value:

ZNFL555DL
A3LSMA426U
A3LSMA516U

Measured SAR:

Head:

0.66 W/kg
1.11 W/kg
1.18 W/kg

Body:

1.20 W/kg
1.25 W/kg
1.20 W/kg

Simultaneous Transmission:

1.59 W/kg
1.59 W/kg
3.25 W/kg

Wireless Router:

1.27 W/kg
1.06 W/kg
1.37 W/kg

Phablet:

3.96 W/kg
3.81 W/kg

Buyers information

Price:

$ 200
€ 340
$ 500

User Manual:

This is the official LG K51 User Guide in English provided from the manufacturer.
This is the official Samsu​ng Galaxy A42 User Guide in English provided from the manufacturer.
This is the official Samsu​ng Galaxy A51 5G User Guide in English provided from the manufacturer.

In The Box:

Charger, USB Cable, SIM Ejector
A to C USB Cable, Wall Adapter, SIM Pin/Ejector, Quick Start Guide, Terms & Conditions

Availability

Officially announced:

May 06, 2020
Sep 02, 2020
Apr 08, 2020
FCC OKs Cingular\'s purchase of AT&T Wireless