BM1396

BM1396 is a 7 nm SHA-256 mining ASIC from Bitmain (silicon chip ID 0x1396), the die D-Central's canonical chip database attributes to the "Plus" members of the Antminer S17 generation — the S17+ and T17+. It belongs to Bitmain's Gen 2 7 nm family that reached the market in 2020, and like every chip in the lineage it does one job: compute the double-SHA-256 hashes that Bitcoin's proof-of-work depends on, as fast and as efficiently as its silicon allows.

Where the BM1396 is used

In D-Central's chip database, the BM1396 is the die behind the air-cooled Antminer S17+ and the T17+ — the higher-binned "Plus" refresh of Bitmain's first 7 nm generation. These were the efficiency-leading machines of their era, landing in the neighborhood of 36 J/TH at a time when the previous generation hovered far higher.

Here it is worth being honest about an attribution nuance. Many references group the entire S17/T17 generation — base S17, S17 Pro, T17, S17+, T17+, S17e, T17e — under the closely related BM1397 (0x1397). D-Central's database draws a finer line: it treats the "Plus" boards as carrying their own 0x1396 die that enumerates with a distinct chip ID, while the base S17/T17 boards run the BM1397. The two are register-compatible within the same BM1397-era 0x51/0x41 header family, which is precisely why marketplace listings so often conflate them. Whether you regard BM1396 as a separate die or as a high-bin of the BM1397 envelope, the practical takeaway is the same: an 0x1396 readback belongs to an S17+/T17+ board, and that lineage should be tracked rather than assumed.

What the silicon looks like

On a stock S17+ hashboard, D-Central's database records 65 BM1396 chips wired in a single serial chain, with the board divided into 12 voltage domains. Each domain places several chips in series behind one DC-DC converter, so the control board manages current across groups of chips rather than one chip at a time — voltage here is a per-domain quantity (nominally around 1.55 V across a domain), never a per-chip setting. The exact chips-per-domain count on these Plus boards is not independently verified in D-Central's records and is flagged accordingly; the database lists per-chip throughput on the order of 200 GH/s as the working nominal figure for the generation.

Architecturally the BM1396 sits a generation behind the 5 nm dies that power today's flagships. Compared to the newer BM1368 (the 5 nm S21-class die) or the BM1366, the BM1396 trades absolute efficiency for the durability and serviceability that make S17+ boards a long-lived workhorse on the secondary market. It is, in short, a mature, well-understood member of the ASIC chip family.

Repair and diagnostic relevance

The single most useful fact for anyone servicing this hardware is the chip-ID disambiguation. Because BM1396 and BM1397 are frequently conflated in listings and even in repair notes, the safe move before swapping or harvesting a board is to read back the chip ID and confirm 0x1396 (S17+/T17+) versus 0x1397 (base S17/T17). Keep the families on their own lanes: an S17+/T17+ board should not be casually mixed into a base-S17 chain, and vice versa, even though the two enumerate through a shared header family.

For diagnostics, the usual S17-generation discipline applies — read the chain for missing or zero-hashing chips, check each voltage domain rather than chasing a single chip, and treat a domain-wide dropout as a converter or rail problem rather than a chip failure. If you are sourcing or repairing S17+/T17+ units, our miner catalog lays out the family context, and the firmware comparison covers the tuning options that decide how much usable hashrate you pull from these boards in their second life.