Samsung Galaxy A51 (TV SM-A515F/DST) vs Xiaomi Redmi Note 9 (128GB/4GB)
Side by side comparison between Samsung Galaxy A51 vs Xiaomi Redmi Note 9 phones, differences, pros, cons and full specifications. What's the better?
,
6.5"
AMOLED
AMOLED
1080x2400
48
MP
MP
32mp
4GB
RAM
RAM
Octa-core
4000
mAh
mAh
(Non removable)
vs
6.53"
IPS
IPS
1080x2340
48
MP
MP
13mp
4GB
RAM
RAM
Octa-core
5020
mAh
mAh
(Non removable)
What's the better phone? Samsung Galaxy A51 (TV SM-A515F/DST)
The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!
15 Advantages 
6 Advantages | 32 Common items in both devices |
| 4GB LPDDR4X |
| 128GB (107GB available) / 128GB (106GB available) |
| eMMC 5.1 |
| Until 1TB microSD, microSDXC / Until 512GB microSD, microSDXC |
| Plastic body, glass front |
| 60Hz |
| 16 million |
| +25 specs and more in the table below |
Check the comparison table below for more items that are not evaluated in comparison score above.
Highlight differences Clear highlight📱 Model features | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| Model | Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) |
| Other model names | Galaxy A51 TV SM-A515F/DST | Mi Redmi Note 9 CX296VRD, CX296CIN, M2003J15SS/2003J15SC |
| Country or region available |  Brazil |   Brazil, China, India |
| Brand | Samsung | Xiaomi |
| Release date | 12/16/2019, Announced: 12/12/2019 | 5/12/2020, Announced: 4/30/2020 |
| Depth | 7.9 millimeters (0.31 inches) | 8.9 millimeters (0.35 inches) |
| Size (width x height) | 73.6 x 158.5 millimeters (2.9 x 6.24 in) | 77.2 x 162.3 millimeters (3.04 x 6.39 in) |
| Weight | 172 grams (6.02 ounces) | 199 grams (6.97 ounces) |
| Build, materials | Plastic body, glass front | Plastic body, glass front |
| Protection against water and others | Not supported | Water repellent nano-coating (don't immerse) |
📲 Display | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| Display type | Super AMOLED | TFT IPS LCD |
| Screen size | 6.5" inches | 6.53" inches |
| Screen-to-body ratio | ~87.4% (screen-to-body ratio) | ~83.5% (screen-to-body ratio) |
| Display resolution | 1080x2400 pixels (20:9) | 1080x2340 pixels (19.5:9) |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 405 PPI | 395 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Gorilla Glass 3 | Gorilla Glass 5 |
| Refresh rate | 60Hz | 60Hz |
| Display features | Always-On Display | 450nits[typ] |
🤖 Operating System | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| System version | Android 10 | Android 10 |
| Firmware update | Android 13 | Android 11 |
| User Interface | One UI 2.5 / 3.1 / 4.1 / 5.0 | MIUI 11 / 12 |
⚙️ Processor | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| Chipset | 64bit: Samsung Exynos 9611 (10nm) | 64bit: MediaTek Helio G85 (12nm) |
| CPU | Octa-core, 2 processors: 4x 2.3GHz ARM Cortex-A73 (Quad-core) 4x 1.7GHz ARM Cortex-A53 (Quad-core) | Octa-core, 2 processors: 2x 2GHz ARM-Cortex-A75 (Dual-core) 6x 1.8GHz ARM-Cortex-A55 (Hexa-core) |
| GPU graphical controller | ARM Mali-G72 MP3 (850MHz) | ARM Mali-G52 MC2 (1GHz) |
| Performance (benchmark) | AnTuTu: 113051 (v7), 175363 (v8) Geekbench: 5401 (v4.4), 1294 (v5.1) GFXBench: 5.6fps (ES 3.1 onscreen) | AnTuTu: 200451 (v8) Geekbench: 1292 (v5.1) |
💽 Memory and storage | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| RAM memory | 4GB LPDDR4X | 4GB LPDDR4X |
| Internal storage | 128GB (107GB available) eMMC 5.1 | 128GB (106GB available) eMMC 5.1 |
| External storage | Until 1TB microSD, microSDXC (dedicated slot) | Until 512GB microSD, microSDXC (dedicated slot) |
📶 Mobile networks | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| Dual-SIM | Dual-SIM Standby - Call active on one sim card (dedicated slot) | Dual-SIM Standby - Call active on one sim card (dedicated slot) |
| SIM card | 2 slots (Dual-SIM) nano-SIM (4FF) | 2 slots (Dual-SIM) nano-SIM (4FF) |
| Maximum Download / Upload | 600/150 Mbps | 300/150 Mbps |
| Network technology | 2G, 3G, 4G | 2G, 3G, 4G |
| Frequency, bands | Expand band details Collapse details | |
| GSM MHz band | Quad-Band 850/900/1800/1900 | Quad-Band 850/900/1800/1900 |
| Primary 2G network | GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
| Primary 3G network | UMTS 850/900/1700/1900/2100 | UMTS 850/900/1700/1900/2100 |
| Primary 4G network | LTE Cat12/13 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 20, 26, 28, 66) VoLTE | LTE Cat7 (1, 2, 3, 4, 5, 7, 8, 20, 28) TD-LTE (38, 40, 41) VoLTE |
| Primary 5G network | Not supported | Not supported |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE, LTE-A | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A |
| Secondary 2G network | GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
| Secondary 3G network | Not supported | UMTS 850/900/1700/1900/2100 |
| Secondary 4G network | Not supported | LTE Cat7 (1, 2, 3, 4, 5, 7, 8, 20, 28) TD-LTE (38, 40, 41) VoLTE |
| Secondary data network | GPRS, EDGE | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A |
📷 Camera | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| Back camera (main camera) | (quad camera) 48 megapixels 12MP ultrawide f/2.213mm1.12µm 5MP telephoto f/2.440mm 5MP depth f/2.21/5.0"1.12µm | (quad camera) 48 megapixels 8MP ultrawide f/2.213mm1/4"1.12µm118° 2MP macro f/2.41.75µmAF 2MP depth f/2.41/5"1.7µm |
| Main camera resolution | 8000x6000 pixels | 8000x6000 pixels |
| Video recording (primary) | 4K UHD (3840x2160) 30 fps | Full HD (1920x1080) 30 fps |
| Flash | LED flash | LED flash |
| Focal aperture | f/2.0 (aperture) | f/1.8 (aperture) |
| Focal length | 26mm lens | 26mm lens |
| Sensor size | 1/2" inches | 1/2" inches |
| Pixel size | 0.8µm pixel | 0.8µm pixel |
| Autofocus | PDAF: phase detection autofocus | PDAF: phase detection autofocus |
| Touch focus | Supported | Supported |
| Image stabilization | EIS: Digital stabilization | EIS: Digital stabilization |
| Zoom | Only digital zoom | Only digital zoom |
| Face/smile detection | Face detection, Smile detection | Face detection, Smile detection |
| BSI sensor | Not supported | Supported |
| HDR | HDR photo on both cameras | HDR photo on both cameras |
| Camera extras | feature not registered | feature not registered |
📸 Front camera | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| Front camera (secondary) | 32 megapixels | 13 megapixels |
| Front camera resolution | 6528x4896 pixels | 4128x3096 pixels |
| Video recording (secondary) | 4K UHD (3840x2160) | Full HD (1920x1080) |
| Front flash | Not supported | Not supported |
| Focal aperture | f/2.2 (aperture) | f/2.3 (aperture) |
| Focal length | 26mm lens | 29mm lens |
| Sensor size | 1/2.8" inches | 1/3.06" inches |
| Pixel size | 0.8µm pixel | 1.12µm pixel |
🔉 Sound and multimedia | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| Loudspeaker | Supported | Mono sound (not stereo) |
| Active noise cancellation | 2 microphones or more | 2 microphones or more |
| Radio | FM (RDS) | FM |
| TV | Digital TV | Not supported |
| Video formats | MP4, H.265, H.264, H.263, XviD, MKV | MP4, H.265, H.264, H.263, XviD, MKV |
| Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, WAV, WMA, eAAC+, FLAC |
🔌 Connectivity | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| USB | USB 2.0 Type-C, USB OTG On-The-Go | USB 2.0 Type-C, USB OTG On-The-Go |
| Audio output | 3.5mm jack | 3.5mm jack |
| TV output | Not supported | USB Type-C (reversible) |
| Bluetooth | 5.0 + A2DP/LE | 5.0 + A2DP/LE |
| WiFi | 802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot | 802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot |
| DLNA | Not supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou |
| NFC | Supported | Not supported |
| Infrared port | Not supported | Supported |
🧭 Sensors | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| Sensors | Accelerometer Ambient light sensor ANT+ Compass Face unlock Fingerprint sensor (under display) Gyroscope Hall effect Virtual proximity sensor | Accelerometer Ambient light sensor Compass Face unlock Fingerprint sensor (rear-mounted) Gyroscope Proximity sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| Battery type | LiPo: li-ion polymer (Non removable) | LiPo: li-ion polymer (Non removable) |
| Battery capacity | 4000 mAh | 5020 mAh |
| Charger, watts | 15W Wired fast charging | 18W Wired fast charging 9W Reverse charging by cable |
| Inductive / wireless charging | Not supported | Not supported |
| Talk time autonomy | feature not registered | 33 hours (1.4 days) |
| Standby | feature not registered | feature not registered |
➕ Other features | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| Call control | Voice dialing, Voice recorder | Voice dialing, Voice recorder, Voice commands |
| Messaging | SMS (T9), MMS, E-mail, Push mail | SMS (T9), MMS, E-mail, Push mail |
| Hands-free calling | Supported | Supported |
| Video calling | Supported | Supported |
| Ringtones | Polyphonic and customized | Polyphonic and customized |
| Web browser | HTML, XHTML, HTML5 | HTML, XHTML, HTML5 |
| Antenna | Internal antenna | Internal antenna |
| Qwerty physical keyboard | Not supported | Not supported |
| Miscellaneous | • Colors: Prism, Crush Black, White, Blue, Pink | • Colors: Forest Green, Midnight Grey, Polar White • 22.5W charger (18W phone support) |
☢️ Radiation rate | ||
| Galaxy A51 (TV SM-A515F/DST) | Redmi Note 9 (128GB/4GB) | |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | 0.84W/kg (head), 0.9W/kg (body) |
| SAR 2W/kg (Europe, UK, etc.) | 0.369W/kg (head), 1.59W/kg (body) | 0.8W/kg (head), 1.14W/kg (body) |