Samsung Galaxy A9 (2018) vs Samsung Galaxy A51 Specs Comparison

Design

Dimensions
6.40 x 3.03 x 0.31 inches 162.5 x 77 x 7.8 mm	6.24 x 2.90 x 0.31 inches 158.5 x 73.6 x 7.9 mm
Weight
6.46 oz (183.0 g)	6.07 oz (172.0 g)
Materials
Back: Glass Frame: Metal	Back: Plastic Frame: Plastic
Biometrics
2D Face unlock, Fingerprint (touch)	2D Face unlock, Optical in-screen fingerprint
Keys
Left: Other; Right: Volume control, Lock/Unlock key; Back: Other	Right: Volume control, Lock/Unlock key
Colors
Caviar black, Lemonade blue, Bubblegum pink	Prism Crush black, Prism Crush white, Prism Crush pink, Prism Crush blue

Display

Size
6.3-inch	6.5-inch
Resolution
2220x1080px, 18.5:9 ratio, 392 PPI	2400x1080px, 20:9 ratio, 405 PPI
Technology
Super AMOLED	Super AMOLED
Refresh rate
	60Hz
Screen-to-body
80.51 %	87.37 %
Features
Ambient light sensor, Proximity sensor	Scratch-resistant glass (Corning Gorilla Glass 3), Ambient light sensor, Proximity sensor

Hardware

System chip
Qualcomm Snapdragon 660 SDM660 (14 nm)	Samsung Exynos 9611 (10 nm)
Processor
Octa-core 2200 MHz Kryo 260	Octa-core 2300 MHz 4x 2.3GHz Cortex-A73 + 4x 1.7GHz Cortex-A53
GPU
Adreno 512	Mali-G72 MP3
RAM
6GB (LPDDR4)	4GB (LPDDR4)
Internal storage
128GB, available to use: 108.9 GB	128GB, available to use: 105.9 GB
Storage expansion
microSDXC up to 512 GB	microSDXC up to 512 GB
OS
Android (10, 9.0 Pie, 8.0 Oreo), Samsung One UI	Android (11, 10), Samsung One UI

Battery

Capacity
3800 mAh	4000 mAh
Type
Li - Polymer	Li - Polymer
Charging
Samsung Adaptive Fast Charging	Fast charging

PhoneArena Battery Tests

Battery Life Estimate

Untested

Browsing

Untested

Video

Untested

Gaming

Untested

Battery Life Estimate

5h 22min

Browsing

11h 35min

Video

8h 35min

Gaming

6h 40min

Learn more on our PhoneArena Battery Test Results page

Camera

Rear
Quad camera	Quad camera
Main camera
24 MP (PDAF) Aperture size: F1.7 Focal length: 27 mm Sensor size: 1/2.8" Pixel size: 0.9 μm	48 MP (PDAF) Aperture size: F2.0 Focal length: 26 mm Sensor size: 1/2" Pixel size: 0.8 μm
Second camera
8 MP (Ultra-wide) Aperture size: F2.4 Focal Length: 12 mm Sensor size: 1/4" Pixel size: 1.12 μm	12 MP (Ultra-wide) Aperture size: F2.2 Focal Length: 13 mm Pixel size: 1.12 μm
Third camera
8 MP (Telephoto, Autofocus) Optical zoom: 2.0x Aperture size: F2.4 Focal Length: 52 mm Sensor size: 1/3.9" Pixel size: 1 μm	5 MP (Macro) Aperture size: F2.4 Focal Length: 40 mm
Fourth camera
5 MP (Depth information) Aperture size: F2.2 Focal Length: 24 mm Sensor size: 1/5" Pixel size: 1.12 μm	5 MP (Depth information) Aperture size: F2.2 Sensor size: 1/5" Pixel size: 1.12 μm
Flash
LED	LED
Video recording
3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (30 fps) Hyperlapse, Continuous autofocus, EIS, Video calling, Video sharing	3840x2160 (4K UHD) (30 fps), 1920x1080 (Full HD) (120 fps), 1280x720 (HD) (240 fps) Hyperlapse, EIS
Front
24 MP, Video capture: 1920x1080 (Full HD)	32 MP (HDR), Video capture: 1920x1080 (Full HD)

Connectivity & Features

Bluetooth
5.0	5.0
WLAN
802.11 a,b,g,n,ac,dual-band MIMO, Wi-Fi Direct, Hotspot	802.11 a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot
USB
Type-C, USB 2.0	Type-C, USB 2.0
Location
GPS, A-GPS, Glonass, Galileo, BeiDou	GPS, A-GPS, Glonass, Galileo, BeiDou, Cell ID, Wi-Fi positioning
Sensors
Accelerometer, Gyroscope, Compass, Hall (for flip covers)	Accelerometer, Gyroscope, Compass, Hall (for flip covers)
Other
NFC, ANT+, VoIP, Tethering, Computer sync, OTA sync	NFC, ANT+

Multimedia

Headphones
3.5mm jack	3.5mm jack
Speakers
Earpiece, Loudspeaker	Earpiece, Loudspeaker
Features
Album art cover, Background playback	Dolby Atmos
Screen mirroring
Wireless screen share	Wireless screen share
Radio
FM	FM
Additional microphone(s)
	Noise cancellation

Cellular

4G (FDD)
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), 26(850+), 28(700 APT), 66(AWS-3)	Bands 1(2100), 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 8(900), 12(700 a), 13(700 c), 14(700 PS), 20(800 DD), 25(1900+), 26(850+), 28(700 APT), 29(700 d), 30(2300 WCS), 66(AWS-3), 71(600)
4G (TDD)
Bands 38(2600), 40(2300), 41(2600+)	Bands 38(2600), 39(1900+), 41(2600+)
3G
Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)	Bands 1(2100), 2(1900), 4(1700/2100), 5(850), 8(900)
Data Speed
LTE-A Cat 9 (450/50 Mbit/s), HSDPA+ (4G) 42.2 Mbit/s, HSUPA, UMTS	LTE-A, HSDPA+ (4G) 42.2 Mbit/s, HSUPA 5.76 Mbit/s
SIM type
Nano SIM	Nano SIM

Regulatory Approval

FCC approval
Date approved: Oct 18, 2018 FCC ID value: A3LSMA920F	Date approved: Nov 28, 2019 FCC ID value: A3LSMA515FN
Measured SAR
Head: 0.24 W/kg Body: 0.84 W/kg Simultaneous Transmission: 1.58 W/kg Wireless Router: 1.40 W/kg Phablet: 3.95 W/kg	Head: 0.89 W/kg Body: 1.18 W/kg Simultaneous Transmission: 1.56 W/kg Wireless Router: 1.12 W/kg Phablet: 2.76 W/kg

Buyers information

MSRP
	$ 400
In The Box
Charger, USB cable, Headphones, SIM removal tool, Documentation

Availability

Officially announced
Oct 11, 2018	Dec 12, 2019

Alternative variants

Dual SIM

Dual SIM	Yes

with 128GB storage

RAM	6GB
Internal storage	128GB

for Verizon

4G (FDD)	Bands 2(1900), 3(1800), 4(AWS-1), 5(850), 7(2600), 13(700 c), 20(800 DD), 28(700 APT), 66(AWS-3)
3G	Bands 5(850), 8(900), 2(1900), 1(2100)

for AT&T

4G (FDD)	Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 13(700 c), 25(1900+), 26(850+), 66(AWS-3), 71(600)
4G (TDD)	Bands 41(2600+)

for Sprint

4G (FDD)	Bands 2(1900), 4(AWS-1), 5(850), 12(700 a), 13(700 c), 25(1900+), 26(850+), 66(AWS-3), 71(600)
4G (TDD)	Bands 41(2600+)

for Europe

4G (FDD)	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), 26(850+), 28(700 APT), 66(AWS-3)
4G (TDD)	Bands 38(2600), 40(2300), 41(2600+)
Dual SIM	Yes

Links

Full specifications
Samsung Galaxy A9 (2018) Specs	Samsung Galaxy A51 Specs
PhoneArena Review
Samsung Galaxy A9 (2018) Review	Samsung Galaxy A51 Review
User Reviews
Samsung Galaxy A9 (2018) User Reviews	Samsung Galaxy A51 User Reviews