The Blackmagic Design Spares - Camera URSA Mini Pro 12K - Sensor Assy is the pinnacle of Blackmagic’s imaging technology. Unlike the 4.6K sensors found in previous models, this is a revolutionary 12K S35 sensor with a native resolution of $12,288 \times 6,480$.
This assembly is a matched set containing the CMOS sensor, the specialized optical stack, and the massive thermal mass required to keep the high-bandwidth processor stable during 12K recording.
The 12K "Generation 5" Technology
The 12K sensor is unique because it does not use a traditional Bayer pattern. It uses a new symmetrical pixel design with equal parts red, green, and blue pixels, optimized for multiple resolutions.
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No-Crop Scaling: This sensor assembly is designed to allow the camera to shoot 8K and 4K without cropping the field of view, as the sensor scales internally.
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Integrated OLPF/IR Stack: The glass in front of the sensor is specifically tuned to the 12K resolution to prevent moiré, which becomes a significant challenge at such high pixel densities.
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Thermal Architecture: Because the 12K sensor processes an astronomical amount of data (up to 80 megapixels per frame), the assembly features a heavy-duty copper/aluminum heat-sync backing that must mate perfectly with the camera's internal active cooling system.
When to Replace the 12K Sensor Assembly
Replacing this assembly is usually the result of catastrophic damage or a permanent imaging defect:
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Permanent Sensor "Lines": Vertical or horizontal lines that appear in the RAW data and cannot be removed by black shading or pixel remapping.
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Internal Glass Delamination: If the IR-cut filter or OLPF inside the assembly begins to peel or shows "oil-slick" patterns, the entire assembly usually needs replacement as the 12K stack is highly integrated.
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Physical Pitting: Scratches on the sensor glass that are visible even at wide apertures.
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Electronic Failure: The camera displays a "Sensor Error" or fails to produce an image while the rest of the UI remains functional.
Key Features
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High-Resolution Accuracy: Delivers 80 megapixels per frame with 14 stops of dynamic range.
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12K Specific: This assembly is strictly for the URSA Mini Pro 12K and 12K OLPF models. It is not compatible with the 4.6K G1 or G2 bodies due to different data-pin counts and physical mounting depths.
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Low ISO Noise: Features a native ISO of 800, optimized for the Gen 5 Color Science.
Technical Installation Note
EXTREME CAUTION: Replacing a 12K sensor is the most difficult repair in the URSA lineup. The tolerances at 12K are so tight that the margin for error is nearly zero.
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ISO Class 5 Cleanliness: Even a microscopic dust mote that might be invisible on a 4K sensor will block several pixels on a 12K sensor. Do not open the sensor block outside of a professional clean-bench environment.
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Back Focus Precision: The depth of the 12K sensor is critical. After installation, you must use a flange focal distance gauge or a high-end prime lens and a Siemens star chart to shim the mount. If the sensor is off by $0.01\text{mm}$, your lens marks will not be accurate.
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Firmware Initialization: Once the new sensor is installed, the camera's Main Board must "handshake" with the new silicon. You will likely need to perform a full factory reset and "Black Shading" calibration via the camera menu.
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Thermal Bonding: You must replace the thermal pads or compound behind the sensor. If the 12K sensor is not properly bonded to the cooling block, it will reach critical temperature and shut down (or sustain damage) within minutes of recording in 12K BRAW.
Are you seeing a specific "Sensor Data" error on your 12K, or has the internal glass been physically damaged? Given the cost of this part, it's often worth checking if the issue is just the user-replaceable PL/EF mount glass before replacing the whole assembly.
