TMP75AIDR TMP75 Temperature Sensor for Antminer Iceriver Hashboard
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TMP75AIDR Digital Temperature Sensor – Precision Thermal Monitoring for Antminer & IceRiver Hashboards
The TMP75AIDR (also marked 87K or A78JG4) is a board-mount digital temperature sensor in an SOIC-8 package, used on Antminer and IceRiver hashboards to monitor ASIC chip temperatures in real time. With ±3 °C accuracy, a 2.7–5.5 V supply range and a standard I2C / SMBus interface, it provides the thermal feedback the miner firmware needs to manage fan speed, trigger throttling, and initiate protective shutdowns when temperatures exceed safe limits.
Symptoms of a Failed TMP75
A defective temperature sensor can manifest in multiple ways: the miner may report wildly fluctuating temperatures that do not correlate with actual heatsink warmth, the firmware may lock the fans at maximum speed regardless of load, or the board may trigger a false over-temperature shutdown while the intake air is cool. In some cases the I2C bus hangs entirely, preventing the control board from reading any sensors on the chain — which can take the entire hashboard offline.
Replacement Procedure
Locate the TMP75 on the hashboard — it is typically near the edge of the board close to the connector, marked 87K or A78JG4. Apply flux, remove the old sensor with a hot-air station at 280–300 °C, and clean the eight pads with solder wick. Place the new TMP75AIDR with pin-1 aligned to the board dot marking, apply solder paste, and reflow. After reassembly, boot the miner and verify the reported temperature is stable and reads within a few degrees of ambient at idle — confirming healthy I2C communication.
The TMP75's configurable 9-to-12-bit resolution allows the miner firmware to balance measurement granularity against conversion time. Most mining firmware uses the default 9-bit mode for fast polling, but the sensor supports up to 12-bit (0.0625 °C per LSB) for applications requiring finer thermal tracking.
TMP75AIDR Specifications
| Parameter | Value |
|---|---|
| Category | Board Mount Temperature Sensor |
| Output Type | Digital |
| Configuration | Local |
| Accuracy | ±3°C |
| Supply Voltage | 2.7V – 5.5V |
| Interface | 2-Wire, I2C, SMBus |
| Resolution | 9–12 bit |
| Operating Temperature | -40°C to +125°C |
| Package | SOIC-8 (SMD/SMT) |
| Operating Current | 85µA |
| Output Current | 3mA |
| Temperature Threshold | Programmable |
| Condition | New |
Related Temperature Sensors & Hashboard Components
- LM75A Temperature Sensor – Antminer & Whatsminer
- TMP451 Temperature Sensor – Antminer Hashboard
- S75 Temperature Sensor – Antminer & Whatsminer
- NCT218 Temperature Sensor – Antminer S17 S17e L7
Replacing temperature sensors across multiple boards? Contact us at contact@lys-sz.com — we stock all common sensor ICs for Antminer and IceRiver hashboards.
Worldwide shipping from our Shenzhen warehouse.
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🌍 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.
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