BM1362

BM1362 is Bitmain's first 5 nm SHA-256 mining ASIC (silicon chip ID 0x1362), a fourth-generation die introduced in 2022 to power the air-cooled Antminer S19j Pro family. It computes the double-SHA-256 hashes that Bitcoin's proof-of-work depends on. The BM1362 is genuinely distinct silicon rather than a relabelled earlier part — it carries its own registered bm1362.rs driver and reads back a unique 0x1362 chip ID. Some older component catalogs conflate it with neighbouring Bitmain dies, but the chip-ID readback settles the question.

Where the BM1362 is used

The BM1362 is the die inside the Antminer S19j Pro and S19j Pro+ (also badged S19j Pro-A or S19j Pro Plus). One practical wrinkle for anyone sourcing parts is that the "S19j Pro" badge has spanned both 7 nm and 5 nm silicon depending on the production revision, so the model sticker alone does not reliably tell you which die is inside — only the chip-ID readback does. The BM1362 is also easy to confuse with the 7 nm BM1398 that powers the closely named S19 and S19 Pro: a different process node, a different chip ID, and a different board layout. A hashboard built around one die will not drop into another even when the badges look alike, so always confirm the chip-ID readback before sourcing a replacement.

What the silicon looks like

The BM1362 is built on a TSMC 5 nm process, a step down from the 7 nm node of the BM1398 generation it succeeds. On a firmware-verified S19j Pro hashboard, 126 BM1362 dies are wired in a single serial chain. Like the rest of its ASIC chip generation, each die receives the full block header over its serial interface and performs on-chip version rolling (the hardware ASICBoost technique standardised as BIP 320), iterating the version-field bits to search more of the nonce space per job. The board is segmented into voltage domains so the control board can manage current across groups of chips rather than one die at a time — the standard per-domain power scheme for this family, though the exact domain count on these specific boards is not firmware-confirmed in our data. Late-production S19j Pro units drive these boards from a BeagleBone-class control board rather than the FPGA-based controllers of earlier Antminers, and bench testing has run a complete S19j Pro at sustained throughput to confirm the die is fully production-grade rather than a paper part.

Power, efficiency, and tuning

Each BM1362 die is rated on the order of 110 GH/s, with a die-level efficiency near 21.5 J/TH. At the complete-miner level the wall figures are higher once the PSU, fans, and control board are included: Bitmain rates the full S19j Pro near 100 TH/s and the S19j Pro+ around 120 TH/s, both roughly in the 28–30 J/TH range at the wall. Because the chip exposes a tunable PLL frequency alongside per-domain voltage, custom firmware can walk these operating points to chase efficiency, raw hashrate, or a fixed power envelope — the same tuning levers available across the related BM1366 and BM1368 dies further along the lineup.

Why it matters for repairs and buyers

For anyone servicing or buying an S19j Pro, the BM1362 is the detail that decides whether a part actually fits. Because the model badge alone cannot tell you whether a unit carries 7 nm or 5 nm silicon, the safe practice is to read the chip ID back from the chain rather than trusting the sticker — this is also how you spot a board that has been re-badged across revisions. Knowing the chip identity helps you reason about real efficiency, plan repairs at the hashboard level, and judge whether a low hashrate reading points to a tuning issue or a failing chain. Our miner catalog lays out the S19-class options side by side, and the firmware comparison shows how tuning choices turn a known quantity of silicon into sustainable hashrate.