BM1744AB Chip Stencil & Holder Tin Tool for Antminer Z11 Hashboard

Antminer BM1744AB Chip Stencil and Holder Tin Tool Kit | ASIC Repair Kit for Z11 Hash Board

The BM1744AB chip stencil and holder tin tool kit is a complete reballing fixture for the Antminer Z11 Equihash miner hashboard. Each Z11 hashboard hosts just 3 BM1744 chips — one per power management IC — running at a working voltage of 0.84V and operating frequency of 650MHz. The chip is built on Bitmain's proprietary 12nm process with Bare Die molding for improved heat dissipation, and delivers 45 KSol/s per chip (135 KSol/s aggregate per board).

Because Z11 hashboards have so few chips per board, a single failed BM1744AB takes out one-third of the board's hashrate immediately. The standard recovery path is chip-level reballing — and reballing without a proper fixture is the #1 cause of failed Z11 hashboard repairs. This kit pairs a laser-cut steel mesh stencil with an anti-static chip holder, giving repair benches the alignment precision and ESD protection the BM1744AB needs.

Where the BM1744AB Tin Tool Fits in Z11 Repair

• Chip-level repair — when one of the 3 BM1744 chips fails, reball or replace it to restore hashboard performance.
• Z11j and Z11e variants — same BM1744 chip family, same kit fits.
• Z15 hashboards — share the BM1746 / BM1746AA chip variants in the same stencil family per AliExpress reseller listings.
• Bare Die molding pad work — the kit accommodates the open-die BGA layout characteristic of 12nm Bitmain chips.
• Repair-bench production work on legacy Equihash mining hardware.

Construction and Materials

• High-temperature resistant composite steel — withstands SAC305 reflow profiles without warping.
• Anti-static chip holder — protects the BM1744AB from ESD damage during handling.
• Laser-cut steel mesh stencil — burr-free dimensional consistency on the BGA pad pattern.
• Anti-charge generation on contact surfaces — safe for the small voltage envelope (0.84V) of the BM1744 power domain.
• Reinforced, long-lasting construction — survives hundreds of reballing cycles with proper cleaning.

BM1744AB Tin Tool Kit Specifications

FAQ — BM1744AB Tin Tool Kit

Q: How do I diagnose which BM1744 chip failed on a Z11 hashboard?
A: With only 3 chips per board, the diagnosis is direct: measure the 0.84V working voltage on each chip's power domain. The chip whose domain is dead or out-of-spec is the failed one. Some Z11 hashboard testers also report the chip count directly.

Q: Will this kit work for Z11j or Z11e variants?
A: Yes — the Z11j and Z11e use the same BM1744 chip family in the same BGA footprint. The kit is interchangeable across Z11 / Z11j / Z11e repair work.

Q: Can I use this kit for Z15 hashboards too?
A: Z15 uses the BM1746 / BM1746AA chip family. AliExpress resellers commonly list this kit as compatible with both Z11 (BM1744 / BM1744AB) and Z15 (BM1746 / BM1746AA) — confirm with our sales team if you're working specifically on Z15 boards.

Q: What's the right reflow profile for the 12nm Bare Die BM1744AB?
A: Bare Die packages are slightly more sensitive to thermal shock than standard BGAs. Preheat the board to 150°C before applying hot air, ramp to peak ~240°C, hold for 30-45 seconds, then controlled cool-down. Don't exceed 250°C peak.

Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com for volume pricing on Z11 / Z15 reballing kits.

Related products

• Antminer BM1744AB Stencil Plate (Z11 — stencil only)
• Antminer BM1760 Tin Tool Kit (D3)
• BM1368PA / PB Stencil (S21 / T21 Hydro)
• APW7 PSU (compatible with Z11 setup)

Repair benches rebuilding Antminer Z11 / Z11j / Z11e fleets in volume? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.