Where is the important chip of Whatsminer M21S hash board located?

Whatsminer M21S is a miner using the SHA-256 algorithm, the maximum hash rate is 58Th/s, and the power consumption is 3360W. The M21S miner has three hash boards. How much do you know about the chips on the hash board? Let's find out together through this article!

Chip silkscreen: KF1921

Chip name: WhatsMiner KF1921 Chip

A single Whatsminer M21S hash board consists of 66 KF1921 chips, which are responsible for the hash rate calculation of Whatsminer M21S.

KF1921 ASIC chip

Chip location: UP37

Chip silkscreen: 24C02RP

Chip name: M24C02-DRMF3TG/K

M24C02-DRMF3TG/K is a serial memory (EEPROM) with 2KBIT memory size, I2C memory interface, operating power supply voltage between 1.8V ~ 5.5V, and operating temperature between -40°C ~ 125°C. Chip data retention time, up to 1 million write cycles, Schmitt trigger input for noise filtering.


Chip location: UP39

Chip silkscreen: TAR

Chip name: SN74LVC1T45DCKR

Designed for asynchronous communication between two data buses, the SN74LVC1T45 is packaged in SC70(6) technology and is a single-bit non-inverting bus transceiver. The fully configurable dual rail design allows each port to operate over the full 1.65V to 5.5V supply work within the scope.

single-bit non-inverting bus transceiver chip

Chip location: UP38

Chip silkscreen: 75018093

Chip name: SGM3750

With an integrated switching FET rated for 40V, the SGM3750 is a boost converter that can drive LEDs in series. It is marked in a green TDFN-2×2-6L package, and the operating ambient temperature is between -40°C and +85°C. The boost converter operates at a fixed switching frequency of 650kHz to reduce output ripple, improve conversion efficiency, and allow the use of small external components that prevent the output voltage from exceeding the IC's absolute maximum voltage rating under open LED conditions.

SGM3750 chip

Chip location: UP36

Chip silkscreen: 75825J3A

Chip name: CT75MMR

The CT75 is a digital temperature sensor chip with an accuracy of ±0.5°C and is compatible with SMBus, I2C, and 2-wire interfaces. The operating temperature range is -40°C to 125°C, and the chip has built-in programmable over-temperature/under-temperature protection. In addition, it includes a high-precision bandgap circuit, a 12-bit analog-to-digital converter that provides 0.0625°C resolution, a calibration unit with non-volatile memory, and a digital interface module.

CT75 temperature sensor chip

Chip location: UP34

Chip silkscreen: A9jMU

Chip name: Si9183DT-AD-T1

The Si9183DT-AD-T1 is a high-performance and small-size 150mA CMOS LDO (low dropout) regulator. Its ultra-low ground current and dropout voltage extend battery life in portable electronics. The device offers better line/load transient response and ripple rejection than bipolar or Bi CMOS LDO regulators. It is designed to maintain regulation while delivering a 300mA peak current. It is packaged in a thin SOT23-5 and operates between -40°C and 85°C.

CMOS LDO regulator

Chip silkscreen: 2AB

Chip name: MMBT3906

The MMBT3906 is a 220mV -200mA MOS chip in a SOT-23 package. The operating crystallization temperature is between -55°C and +150°C.

2A MOS chip

Whatsminer M21S hash board chip summary:

hash board chip summary

About products purchase, please contact our sales manager:
[email protected]

About miner repair and after-sale issues, please contact the repair manager email:
[email protected]

For business cooperation, please contact:
[email protected]

If you have any dissatisfaction during the transaction or have valuable suggestions for us, please contact us via this email address:
[email protected]
National Day Holiday Notice

Dear Customers
As China is about to usher in the National Day, international logistics will be suspended. Our company will suspend shipments on September 29, 2022, and resume out of warehouse shipments on October 5, 2022. Thank you for your trust and support.
Best wishes,


Recently, many companies claiming to be mining companies imitate us and say that they are related to us, or that they are our branch companies, which has caused customers to be deceived. Please be careful not to believe any impostors, please check our correct contact information and beware of being deceived getting scammed, and losing money.
please check our right contact way: Here