When a mixed lot of NAND Flash chips arrives at a recycling station, the instinct is to grab a magnifier and read the silkscreen for brand identification. In practice, package form factor is the primary sorting criterion — it determines which processing line the chip goes through, what equipment is needed, what the yield rate will be, and ultimately how the lot is priced. BGA (Ball Grid Array) chips, TSOP (Thin Small Outline Package) chips, and Wafer/Die lots each require fundamentally different disassembly processes and precious metal recovery paths. Mixing them on one line drags down the overall yield.
BGA Chip Line: Sourced primarily from SSD and USB drive teardowns. BGA chips have a solder ball array on the underside; removal requires a hot air rework station at 230–260°C followed by tweezers or a suction pen. A single SSD typically contains 4–16 BGA NAND chips. After removal, chips are graded by process node and brand. BGA chips have dense, small pads, making them suitable for re-balling and re-soldering or grinding for material recovery. Yield is the highest of the three lines.
TSOP Chip Line: Found in older SD/CF memory cards and low-end USB drives. TSOP chips have leads on two sides; removal is a simple soldering iron job. Individual chip value is low, so batches must be sub-sorted by brand (Samsung, SK Hynix, Kioxia, SanDisk, Micron, Intel) and process node (SLC/MLC/TLC/QLC). Mixed lots cannot be quoted as a single SKU.
Wafer/Die Line: Sourced from wafer fab offcuts or scrapped wafers. Uncut wafers must go through dicing (sawing) to produce individual dies before grading. Pre-cut dies go straight to inspection. This line handles the largest volume but the lowest per-unit value. Key variables: wafer size (4/6/8-inch) and process node. An 8-inch wafer SLC die can be worth significantly more per die than a 12-inch TLC die.
Once the form factor assigns the chip to a line, process node (SLC > MLC > TLC > QLC) sets the value gradient. SLC chips command the highest price but are scarce in the secondary market. MLC follows. TLC dominates 2024–2026 volume. QLC is essentially scrap or low-end re-manufacturing feedstock. On the brand tier, Samsung and SK Hynix original (genuine) chips top the pricing ladder, followed by Kioxia (formerly Toshiba) and SanDisk, then Micron and Intel (Solidigm). Within the same brand and node, genuine original > white label > black label, with a 3–5x price spread.
| Category | Typical Source | Node | Brand Tier | Reference Price (CNY) |
|---|---|---|---|---|
| BGA NAND (64Gb TLC) | SSD teardown | TLC | Samsung / SK Hynix genuine | 30%–50% above TLC white-label per chip |
| TSOP NAND (4Gb MLC) | Legacy SD cards | MLC | Kioxia / SanDisk genuine | Weight-based; 2–3x TLC equivalent per gram |
| Wafer Die (16Gb SLC) | Fab offcut | SLC | Samsung / Micron | Highest per-die value; quoted per wafer |
| eMMC A-grade (64GB) | Phone/tablet teardown | TLC-dominant | Samsung / Kioxia / WD | 35–50 CNY per chip |
| eMMC Industrial (64GB, -40~85°C) | Industrial / automotive | TLC / MLC | Samsung / SK Hynix | 60–80 CNY per chip |
Note: Prices reflect September 2026 Shenzhen Huaqiangbei spot reference ranges. Actual quotes fluctuate with the monthly CFM Flash Market index and OEM production cut/restore cycles. Industrial-grade eMMC commands a 50%–100% premium over consumer grade due to the -40~85°C wide-temperature spec.
On receiving a mixed lot, first split into three piles by form factor (BGA / TSOP / Wafer-Die), then sub-sort each pile by process node and brand. Do not sort by brand first — the same brand's BGA and TSOP chips go to different lines and will interfere with each other during disassembly. For TSOP, weigh the batch on a digital scale, divide by chip count to estimate per-chip value. For BGA, count chips and multiply by per-chip rate. For Wafer/Die, quote by wafer count; an 8-inch wafer typically yields dozens to hundreds of dies, and yield rate directly determines final material recovery.
MemoryRecycle (Contact: Mr. Wu, Tel: 188-2424-1693) handles full-spectrum NAND Flash chip and eMMC module recycling across BGA, TSOP, and Wafer/Die formats, with 30-second initial grading and a detailed classification quote within 48 hours.