NCT7491RQR2G Thermal Management by ON Semiconductor

Remote Thermal Monitor and Fan Controller with PECI 3.0 Interface and SMBus Compatible Master

Status: Active
Series: NCT7491
RoHS: Compliant
Download Datasheet Visit Manufacturer Site View Pricing & Stock

The NCT7491 is a two wire serially programmable hardware monitor. It can monitor 2 remote temperature zones and its own ambient temperature. A PECI 3.0 single wire interface allows the NCT7491 to monitor CPU temperatures. The NCT7491 also implements an SMBus compatible master, allowing it to read automatically from thermal sensors on the SMBus. The NCT7491 can automatically control the speed of 3 fans using PWM control, and monitor the speed of 4 fans. There are 4 analog inputs, used for measuring 12 V, 5 V, 2.5 V and Vccp channels. The NCT7491 supply voltage and PECI VTT voltage are also monitored. Each of the measured temperature, voltage and fan speed values are compared with programmable limits and if any channel is outside the programmed limit an interrupt is generated via the ALERT output pin. A THERM output is also available for fail safe thermal control. Up to 3 GPIO pins are available for digital control or signalling. Communication with the NCT7491 is accomplished via the SMBus/I2C interface which is compatible with industry standard protocols. The SMBus address is set by 2 address selection pins. The NCT7491 is available in a 24 lead QFN or QSOP package and operates over a supply range of 3.0 V to 3.6 V.

Where to Buy

Prices starting from US$1.18

Distributor Stock
Logo for Farnell
Farnell
from US$1.18
955
in stock
Buy Now
Logo for Newark Electronics
Newark Electronics
from US$2.15
955
in stock
Buy Now
Logo for element14
element14
from US$1.55
955
in stock
Buy Now
Logo for Avnet America
Avnet America
from US$1.58
-
Buy Now
Logo for Avnet Asia
Avnet Asia
from US$1.53
-
Buy Now
Logo for EBV Elektronik
EBV Elektronik
-
-
Buy Now
Logo for Avnet Silica
Avnet Silica
-
-
Buy Now

Features

PECI 3.0 Master for CPU Monitoring
SMBus Compatible Master
On chip Temperature Sensor
2 Remote Sensor Channels
Series Resistance Cancellation on Remote Sensors
3 PWM Fan Control Outputs
4 Tach Monitoring Input
PWM Automatic Fan Speed Control
4 Analog Inputs for Voltage Monitoring
Vdd Supply Voltage Monitoring
PECI VTT Voltage Monitoring
Over temperature Outputs
Limit Comparison of Monitored Channels
SMBus Address Selection Allows up to 3 Devices
Meets SMBus 2.0 Electrical Specifications (fully SMBus 1.1 compliant)
These Devices are PbFree, Halogen Free/BFR Free and are RoHS Compliant
Applications
System Thermal Management
Desktop Computers
Mobile platforms
End Products
PECI 3.0 Generic Interface
Servers

Specifications

Description NCT7491
Compliance Pb-free Halide free
Data Transmission Standard SMBus
ICC Max (mA) 5
VCC Min (V) 3
VCC Max (V) 3.6
T Min (°C) -40
T Max (°C) 125
Package Type QSOP-24

Alternative Descriptions

Motor Driver, Qsop-24 | Newark Electronics
MOTOR DRIVER, QSOP-24 | element14
REMOTE THERMAL MO | Avnet America


Frequently Asked Questions

Where can I find additional details, specifications and documents for a NCT7491RQR2G?

Additional datasheets, footprints and schematics for NCT7491RQR2G are listed on our Part Details page. You can also find images and similar parts to NCT7491RQR2G on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for NCT7491RQR2G on our Product Comparison page. Access via the 'View Pricing & Stock' button to view NCT7491RQR2G price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does NCT7491RQR2G fall under?

The NCT7491RQR2G is listed under Sensors > Thermal Management > Fan Controllers.

Can I view similar or alternative parts?

You can view similar parts to NCT7491RQR2G when available in the Fan Controllers range under the specifications section at the bottom of the details page.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the NCT7491RQR2G you can contact the distributor directly for product support, shipping queries etc.

Is the NCT7491RQR2G RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by ON Semiconductor.

Which authorised distributors for NCT7491RQR2G have stock available?

Authorised distributors including Newark Electronics, element14, Farnell, Avnet America and Avnet Asia have stock available or on a lead time for NCT7491RQR2G.

How do I check stock and lead times for all distributors?

Stock availability and lead times will be displayed for NCT7491RQR2G often in real-time on the comparison pages.

What if I can't find stock of NCT7491RQR2G?

You can fill out our help required form which you can use to request a quote for NCT7491RQR2G from some of our verified obsolescence suppliers. Alternatively, contact us via our web chat in the bottom left of your screen and one of our team will try to help.

We use cookies to improve your experience. See our privacy policy.
Okay