LG K40 vs LG K51 Specs Comparison

Availability

Officially announced
Feb 20, 2019	May 06, 2020
Prices (MSRP)
$180	$200

Design

Dimensions
6.02 x 2.83 x 0.33 inches 153.0 x 71.9 x 8.3 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	7.17 oz / 203.4 g
Materials
Back: Plastic
Resistance
Shock; MIL-STD-810 certified	Yes; MIL-STD-810 certified
Biometrics
Fingerprint (touch)	Fingerprint (touch)
Keys
Left: Volume control; Right: Lock/Unlock key	Left: Volume control; Right: Lock/Unlock key
Colors
Black, Gray, Blue	Titan gray

Display

Size
5.7-inch, 76.28% screen-to-body	6.5-inch, 79.70% screen-to-body
Type
IPS LCD	IPS LCD
Resolution
1440x720px, 18:9 ratio, 282 PPI	1560x720px, 19.5:9 ratio, 264 PPI
Protection
Tempered Glass

Hardware

System chip
Snapdragon 450 SDM450 (14 nm)	MediaTek Helio P22 MT6762 (12 nm)
Processor
Octa-core 2000 MHz ARM Cortex-A53	Octa-core 2000 MHz Arm Cortex-A53
GPU
Adreno 506	IMG PowerVR GE8320
Memory
2GB (LPDDR3)/16GB 2GB/32GB	3GB/32GB
Storage expansion
microSDXC up to 2000 GB	microSDXC up to 2000 GB
OS
Android (8.1 Oreo)	Android (10)

Battery

Type
3000 mAh, Li - Polymer	4000 mAh, Li - Ion

Camera

Rear
Single camera	Triple camera
Main camera
8 MP (PDAF) Aperture size: F2.0 Sensor size: 1/3" Pixel size: 1 μm	13 MP (PDAF) Aperture size: F1.8 Sensor size: 1/3" Pixel size: 1.12 μm
Second camera
	5 MP (Ultra-wide) Aperture size: F2.2 Sensor size: 1/5" Pixel size: 1.12 μm
Third camera
	2 MP (Depth information) Sensor size: 1/5" Pixel size: 1.75 μm
Flash
LED	LED
Video recording
1080p (30 fps) Video calling, Video sharing	1080p Picture-taking during video recording
Front
5 MP (Flash)	13 MP Video capture: 1080p

Connectivity & Features

Bluetooth
5.0	5.0
WLAN
a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot 802.11 a, b, g, n, ac	a,b,g,n,ac,dual-band Wi-Fi Direct, Hotspot 802.11 a, b, g, n, ac
USB
microUSB, USB 2.0	Type-C, USB 2.0
Sensors
Accelerometer, Compass, Ambient light sensor, Proximity sensor	Accelerometer, Gyroscope, Compass, Ambient light sensor, Proximity sensor
Hearing aid compatible
M3/T3	M3/T3
Location
GPS, A-GPS, Glonass, Cell ID, Wi-Fi positioning	GPS, A-GPS, Cell ID, Wi-Fi positioning
Other
NFC, VoIP, Tethering, Computer sync, OTA sync

Multimedia

Headphones
3.5mm jack	3.5mm jack
Speakers
Earpiece, Loudspeaker	Earpiece, Multiple speakers
Features
Album art cover, Background playback	DTS:X Virtual Surround
Screen mirroring
Wireless screen share	Wireless screen share
Radio
FM	FM
Additional microphone(s)
Noise cancellation	Noise cancellation

Cellular

4G (FDD) Bands
2, 4, 5, 12, 13, 66	2, 3, 4, 5, 7, 12, 13, 20, 25, 26, 66, 71
4G (TDD) Bands
	41
3G Bands
5, 8, 2, 1	1, 2, 4, 5, 8
Data Speed
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
Nano SIM	Nano SIM
HD Voice
Yes	Yes
VoLTE
	Yes

Regulatory Approval

FCC approval
	Date approved: Jun 16, 2020 FCC ID value: ZNFL555DL
Measured SAR
	Head: 0.66 W/kg Body: 1.20 W/kg Simultaneous Transmission: 1.59 W/kg Wireless Router: 1.27 W/kg Phablet: 3.96 W/kg

Alternative variants

International version

System chip	MediaTek Helio P22 MT6762 (12 nm)
Processor	Octa-core 2000 MHz ARM Cortex-A53
GPU	IMG PowerVR GE8320
Memory	32GB
Main camera	16 MP
Front	8 MP
4G (FDD) Bands	1, 3, 7, 8, 20
4G (TDD) Bands	38
Dual SIM	Yes

for Boost Mobile

OS	Android (9.0 Pie)
4G (FDD) Bands	2, 4, 5, 12, 13, 25, 26, 66, 71

for Metro by T-Mobile

Memory	32GB
OS	Android (9.0 Pie)
Main camera	13 MP
Front	5 MP
4G (FDD) Bands	2, 4, 5, 7, 12, 25, 26, 66, 71
4G (TDD) Bands	41
FCC approval	Date approved: May 28, 2019 FCC ID value: ZNFX420MM
Measured SAR	Head: 0.51 W/kg Body: 0.98 W/kg Simultaneous Transmission: 1.59 W/kg Wireless Router: 0.98 W/kg Phablet: 3.99 W/kg

for Verizon

4G (FDD) Bands	2, 3, 4, 5, 7, 12, 13, 20, 66
Prices (MSRP)	$170

for Metro

4G (FDD) Bands	1, 2, 3, 4, 5, 7, 12, 13, 20, 25, 26, 66, 71
4G (TDD) Bands	38, 41
3G Bands	5, 4, 2, 1

Links

Full specifications
LG K40 Specs	LG K51 Specs
User Reviews
LG K40 User Reviews	LG K51 User Reviews