Samsung MB-MJ256KA 256 GB MicroSDXC UHS-I Class 10

The MB-MJ256KA/AM is the official manufacturer part number for the Samsung PRO Endurance 256GB microSDXC Memory Card (packaged with a full-size SD adapter). It is specifically engineered for high-intensity, continuous loop recording in always-on surveillance hardware like dash cams, security infrastructure, IP network cameras, and body cams.

Below are the complete technical specifications for this 256GB model:

⚙️ Performance & Core Architecture

• Storage Capacity: 256 GB (1GB = 1,000,000,000 bytes; usable capacity may be slightly lower due to system file formatting)

• Form Factor: microSDXC

• Bus Interface: UHS-I (SDR104)

• Speed Class Ratings: Class 10, UHS Speed Class 3 (U3), and Video Speed Class 30 (V30)

• Maximum Sequential Read Speed: Up to 100 MB/s

• Maximum Sequential Write Speed: Up to 40 MB/s

• Minimum Sustained Write Speed: 30 MB/s (guaranteed by the V30/U3 standard specification to prevent dropped frames during video encoding)

• Video Resolution Optimization: Fully optimized for continuous capture of Full HD (1080p) and Ultra HD 4K video feeds

🛡️ Endurance & Industrial Reliability Ratings

• Recording Lifespan: Up to 140,160 hours (over 16 years) of continuous loop recording (tested using Full HD video content encoded at 26 Mbps).

• 6-Proof Ruggedized Protections:

  • Waterproof: Withstands up to 72 hours of submersion in 1-meter deep salt water (3% NaCl solution).

  • Temperature-proof: Operating tolerances from -25°C to 85°C (-13°F to 185°F); non-operating storage tolerance from -40°C to 85°C.

  • X-Ray proof: Protects data up to 100mGy/210sec against airport security scanners (ISO/IEC7816-1 compliance).

  • Magnetic-proof: Resists magnetic field exposure up to 15,000 Gauss for 30 seconds.

  • Drop-proof: Designed to survive impacts and drops up to 5 meters (16.4 feet).

  • Wear-out resistant: Passes mechanical durability stress testing up to 10,000 card swipes/insertions.

• Warranty Profile: Backed by a 5-year limited manufacturer warranty (Note: Included full-size SD adapter features a 1-year independent warranty partition).

📐 Physical Dimensions & Power Parameters

• Operating Voltage: 2.7V to 3.6V standard flash rail allocation

• Operating Humidity Bounds: 40°C, 93%, 500 hours (storage environment baseline)

• microSD Dimensions (W x H x D): 15.00 mm x 11.00 mm x 1.00 mm (0.6 x 0.4 x 0.04 inches)

• microSD Weight: 0.25 grams (0.01 oz)

• Product Base Color: White housing with black text identifiers

📦 Retail Package & Logistics

• Part Suffix Meaning: The "/AM" designation indicates the standard retail packaging and wholesale configuration assigned for the Americas region.

• Included Accessories: Includes 1 x native microSDXC memory card and 1 x premium full-size microSD-to-SD physical hardware adapter sleeve.

• UPC Code: 887276591100