Technical Specifications

Key Features

Applications

• Compact server and computer equipment cooling
• Networking and communications equipment ventilation
• Industrial electronic equipment thermal management
• Control cabinet ventilation where the fan dimensions and performance match
• Compact machinery cooling assemblies
• Electronic enclosures with restricted airflow passages
• Replacement of a matching SUNON SG40281B1-000U-G99 fan
• Equipment requiring 12 VDC axial cooling with tachometer feedback

Purchase Information

We support inquiries for the SUNON SG40281B1-000U-G99 axial cooling fan. Please note that DigiKey lists this model as obsolete and no longer manufactured, so current sourcing availability must be confirmed before purchase. For replacement applications, provide the complete part number, the original fan label, operating voltage, mounting dimensions, lead configuration and required airflow performance. A similar SUNON model, PF40281B1-000U-G99, is listed by DigiKey, but similarity alone does not establish direct compatibility. Confirm mechanical fit, electrical requirements and system cooling performance before choosing an alternative.

Frequently Asked Questions

What is SUNON SG40281B1-000U-G99?
It is a SUNON SG-series DC brushless tubeaxial fan listed with a 40 x 40 x 28 mm frame, 12 VDC supply, three wire leads and high-speed cooling performance.

What is the rated voltage?
The distributor lists a nominal voltage of 12 VDC and an operating voltage range of 8-13.8 VDC. Confirm that the supply and controller match these requirements before installation.

What are the rated current and power?
The listed rated current is 0.520 A and the rated power consumption is 6.24 W. These are the values published for the exact model on the distributor product page.

What are the dimensions of this fan?
The nominal frame dimensions are 40 x 40 x 28 mm. Check the available mounting space, frame thickness, hole positions and cable clearance against the original fan before ordering a replacement.

What is the rated speed?
The listed rated speed is 19,000 RPM. This value belongs to the complete SG40281B1-000U-G99 model and should not be transferred to a different SG-series fan without confirming its specifications.

What airflow does the fan provide?
The distributor lists airflow of 25.6 CFM, or approximately 0.717 m³/min. Installed airflow may be lower depending on system impedance, inlet restrictions and the cooling assembly.

What is the maximum static pressure?
The listed maximum static pressure is 1.450 inH₂O, equivalent to approximately 361.2 Pa. This rating is useful for comparing cooling requirements, but actual system performance depends on the operating point and airflow resistance.

How noisy is SG40281B1-000U-G99?
DigiKey lists a noise level of 58.5 dB(A). Actual measured noise can vary with mounting, airflow obstruction, operating voltage and measurement conditions.

What type of bearing does it use?
The distributor identifies a ball bearing. It also lists an expected service life of 80,000 hours at 40°C. These figures should be understood as published product attributes rather than a guarantee of service life in every installation.

Does this fan have speed feedback?
Yes. The distributor lists a speed sensor (tachometer) and three wire leads. Confirm the exact signal pinout and electrical characteristics against the supplied fan documentation and the host controller.

Is SG40281B1-000U-G99 still manufactured?
DigiKey currently classifies the exact model as obsolete and states that it is no longer manufactured. Remaining inventory or third-party sourcing may vary. Confirm the condition and availability of the specific item before placing an order.

Can PF40281B1-000U-G99 replace this fan?
DigiKey lists PF40281B1-000U-G99 as a similar SUNON part. However, a similar classification does not prove identical speed, airflow, static pressure, connector wiring or mounting compatibility. Verify the replacement datasheet and the equipment requirements before substitution.

What should be checked before ordering?
Confirm the full model number, 12 VDC supply, 0.520 A current rating, 6.24 W power, 40 x 40 x 28 mm frame, 19,000 RPM speed, 25.6 CFM airflow, 1.450 inH₂O static pressure, three-wire connection, tachometer signal, bearing type and lifecycle status. Because the model is listed as obsolete, confirm sourcing availability and evaluate any proposed substitute against the original installation requirements.