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Kioxia’s QLC UFS 4.0 is embedded phone-class flash storage designed to make higher-capacity device configurations practical in a compact package. Kioxia began mass production of its first QLC UFS 4.0 devices in October 2024, initially at 512GB. The chip is not a user-installable upgrade, and its published speed figures are component ratings—not measured results from a particular phone.
What is Kioxia QLC UFS 4.0?
It is an embedded storage component that combines Kioxia BiCS FLASH 3D NAND with an integrated controller in a JEDEC-standard UFS package. UFS (Universal Flash Storage) is designed for use inside finished products such as smartphones and tablets; consumers encounter it as the device’s built-in storage, not as a removable card.
QLC means quadruple-level cell. Each NAND cell stores four bits, compared with fewer bits in a traditional TLC (triple-level cell) design. Storing more bits in each cell increases bit density, which can help device makers offer larger capacities in a compact package. Kioxia describes QLC UFS as suited to mobile devices that need higher storage capacities. That density advantage does not, by itself, guarantee better speed, endurance, power use, or price than a TLC-based alternative.
How fast is the 512GB UFS 4.0 device?
Kioxia rates its 512GB QLC UFS 4.0 device for sequential reads of up to 4,200MB/s and sequential writes of up to 3,200MB/s. These are vendor maximums for the component, not independent benchmarks of a phone. Actual performance in a finished device can depend on its implementation and workload, and the quoted sequential ratings do not establish random-access performance.
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Kioxia’s UFS product page points to WriteBooster as a feature for workloads such as downloads, high-definition video recording, and mobile gaming. Those are potential uses of the storage technology, not a promise that every phone using it will achieve the same result or feel faster in every task.
How does QLC compare with TLC UFS?
QLC’s main stated advantage is capacity density: four bits per cell can make higher capacities feasible within a small package. The available product announcements do not establish a head-to-head comparison with TLC UFS for power consumption, endurance, write amplification, or handset-level speed. Controller and error-correction advances are important to managing QLC NAND, but no comparative figures for those characteristics are supplied here.
Rank #2
- model; THGJFJT2T85BAT0. Chip volume：11 x 13 x 0.95mm Chip capacity ：UFS 4.0. 512Gb.Memory chip Package : 153 FBGA
- THGJFJT2T85BAT0 Chip. FBGA153. UFS4.0.512GB. Memory Chip IC
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| Comparison point | What is established |
|---|---|
| Capacity per package | QLC stores four bits per cell, increasing bit density over traditional TLC; Kioxia’s first announced QLC UFS 4.0 capacity was 512GB. |
| Sequential performance | The 512GB QLC UFS 4.0 device is rated up to 4,200MB/s read and 3,200MB/s write by Kioxia. No directly comparable TLC figure is established here. |
| Random performance | No UFS 4.0 QLC-versus-TLC comparison is established here. |
| Controller and error correction | The package integrates a controller; specific comparative controller or error-correction results are not stated. |
| Power, endurance, and write amplification | Comparative values are not stated. |
| Availability to consumers | The component is embedded storage for OEM-built devices, not a consumer-replaceable module. |
What changed with Kioxia UFS 4.1?
In January 2026, Kioxia announced sampling of QLC UFS 4.1 in 512GB and 1TB capacities. Compared with its prior UFS 4.0/BiCS6 QLC UFS generation, Kioxia reports 25% higher sequential write performance, 90% higher random read performance, and 95% higher random write performance. These are manufacturer-reported generation-level improvements; the announcement does not make them independent phone benchmarks or establish when a particular consumer device will ship.
Will this give phones more storage, and when will 1TB phones arrive?
QLC UFS gives manufacturers another way to build higher-capacity configurations into phones and other compact devices. Kioxia’s 2024 mass-production announcement named 512GB for its initial QLC UFS 4.0 device. The company’s January 2026 UFS 4.1 sampling announcement included a 1TB option, but sampling a component is not the same as announcing a retail phone. The announcements cited here do not identify a handset launch date or guarantee that a 1TB QLC UFS phone is available in a given market.
Rank #3
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Kioxia lists smartphones and tablets alongside PCs, networking equipment, AR/VR, IoT, and AI-enabled devices as target applications. Whether a device maker adopts the component—and which capacity it offers—depends on its product design and launch choices.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can you upgrade a phone with QLC UFS 4.0?
No. This is an embedded storage package with an integrated controller, intended for installation by device manufacturers as part of a finished product. It is not a standard consumer module that can be swapped into an existing phone. If you need more space on a current device, check that model’s supported storage options; an external drive or memory card, where supported, is a separate technology and is not an upgrade to the phone’s internal UFS chip.
Quick Recap
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Rank #4
- KLUGG8NHHB-F0G1 Chip.FBGA153. UFS, 4.0.1TGB. Memory Chip IC
- model; KLUGG8NHHB-F0G1 Chip volume：9 x 13 x 0.9 mm Chip capacity ：UFS.4.0. 1TGb.Memory chip Package : 153 FBGA
- Suitable for use on mobile phones Smart products Repair usage Or upgrade the motherboard capacity Mainboard memory chip IC.
- Support bulk procurement Various integrated circuits Component chip IC.Mainboard memory chip IC Integrated circuit chips Component chip IC。various. Motherboard repair tool Mobile motherboard repair tool
- Various electronic chip models are available in stock from companies. not sure about the chip version Or it can be purchased in bulk You can contact customer service Consultation and confirmation,
Sources
- KIOXIA America: QLC UFS 4.0 mass-production announcement
- KIOXIA America: QLC UFS capacity and application details, October 29, 2024
- Kioxia Corporation: QLC UFS 4.1 sampling announcement, January 2026
- KIOXIA America: UFS product information
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