Antminer S19 S21 T21 S19kpro Hashboard LM75A Temperature Control Module U2
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LM75A Temperature Control Module | U2 Position Repair for Antminer S19 / S19kpro / S21 / T21 Hashboards
The LM75A is the digital temperature sensor IC sitting at the U2 position on Antminer S19, S19kpro, S21, and T21 hashboards. It monitors hashboard temperature and feeds the controller's thermal-protection loop — when the LM75A fails, the controller either reads a stuck temperature (preventing thermal throttling) or trips a false over-temperature shutdown.
Operating temperature range -55°C to +125°C. The sensor reports temperature to the miner controller over the I2C bus, allowing software-readable temperature monitoring for fan-speed control and thermal-protection logic.
When to Replace the LM75A
- Hashboard reports stuck temperature — always reads the same value regardless of load.
- Phantom over-temperature shutdowns — controller trips thermal protection when board is actually cool.
- Temperature reading missing from miner log — sensor not responding on I2C bus.
- Visible damage on the U2 position chip — burnt or cracked package.
LM75A Specifications
| Feature | Specification |
|---|---|
| Module Type | Digital Temperature Sensor |
| Temperature Range | -55°C to +125°C |
| Interface | I2C bus |
| Compatible Hashboard | Antminer S19 / S19kpro / S21 / T21 (U2 position) |
| Function | Temperature monitoring + thermal-protection input |
| Installation | SMD replacement at the U2 chip location |
FAQ — LM75A Temperature Sensor
Q: How do I confirm the LM75A is the failed part?
A: Read the miner log — if temperature is reported as 0°C, 127°C, or a stuck value, the sensor is failed. Probe the I2C bus (SCL / SDA pins) with a scope: healthy sensor responds to address polls; failed sensor produces no acknowledgment.
Q: Are there multiple LM75A positions on the hashboard?
A: Most Antminer hashboards have several temperature sensors at different positions. The "U2" designation refers to one specific location. If multiple sensors fail, replace each — controllers typically average or use the highest reading for thermal-protection logic.
Q: Bulk pricing?
A: Yes — email contact@lys-sz.com for tape-and-reel quantities.
Related products
- TMP75AIDR Digital Temperature Sensor (Antminer hashboard)
- S75 Temperature Sensor Chip
- Antminer S21 / T21 Control Board
- BM1368PB ASIC Chip (S21 / T21)
Antminer S19 / S21 / T21 hashboard repair benches stocking LM75A sensors in volume? Email contact@lys-sz.com for tape-and-reel pricing. Worldwide shipping from our Shenzhen warehouse.
Shipping & Customs
🇺🇸🇪🇺 USA & European Union (DDP):
Orders are delivered DDP (Delivered Duty Paid). All customs duties, import taxes, and fees are included — no additional charges on delivery.
🌍 Rest of world:
Orders ship from China. Depending on your country, local customs authorities may apply import duties or taxes. Any such fees are set by your local authorities and are not included in the product price.
Buying in bulk for a mining farm or repair shop?
Get dedicated B2B pricing on this part and across our full catalog — quote response within 24 hours, payment by T/T USD bank wire, and DDP delivery available for US & EU customers (and other lanes on request).
