Description
The Sunon PF40281B1-1000U-G9H (also known as PF40281B11000UG9H) is a high-performance 40x40x28 mm (1.57×1.57×1.10 in) DC brushless tubeaxial cooling fan engineered for extreme thermal density applications. Operating on 12 VDC at an impressive 17,600 RPM, this compact unit produces an airflow of 24.9 CFM (42.3 m³/h) and an immense static back pressure of 2.05 in H₂O (510.6 Pa) while consuming 6.12 W. Built with a rugged thermoplastic PBT housing, reinforced impeller, and precision dual ball bearings, the fan incorporates automatic restart protection and a third-wire frequency generator (tachometer) output for real-time rotational speed monitoring.
Key Features
- Extreme Static Pressure: Generates 2.05 in H₂O to drive dense airflow across tightly packed server heatsinks.
- Ultra-High Speed Motor: Precision brushless DC motor operates at 17,600 RPM delivering outstanding 24.9 CFM volume.
- Dual Ball Bearings: Heavy-duty ball bearing architecture ensures continuous-duty longevity in high-temperature operating environments.
- Tachometer Speed Monitoring: Integrated third-wire frequency generator output provides real-time RPM feedback to system controllers.
- Automated Motor Protection: Built-in auto restart and reverse polarity safeguards protect circuitry during locked-rotor faults.
Technical Specifications
| Manufacturer | Sunon |
|---|---|
| Manufacturer Part Number (MPN) | PF40281B1-1000U-G9H |
| Alternate Part Number | PF40281B11000UG9H |
| Product Series | PF Series |
| Product Category | DC Axial Fans |
| Fan / Component Type | Brushless DC Tubeaxial Fan |
| Supply Type | DC |
| Rated Voltage | 12 VDC |
| Operating Voltage Range | 10.8 to 13.2 VDC |
| Rated Current | 0.51 A |
| Power Rating | 6.12 W |
| Speed (RPM) | 17,600 RPM |
| Airflow | 24.9 CFM (42.3 m³/h / 0.697 m³/min) |
| Static Pressure | 2.050 in H₂O (510.6 Pa) |
| Noise Level | 56.0 dB(A) |
| Airflow Direction | Intake over Struts / Exhaust past Impeller |
| Direction of Rotation | Counter-Clockwise (viewed from front of impeller) |
| Dimensions (L × H × D) | 40 × 40 × 28.0 mm (1.57 × 1.57 × 1.10 in) |
| Mounting Hole Pitch | 32.0 ± 0.3 mm (1.26 in) |
| Mounting Hole Diameter | 3.5 mm (4 Corner Holes) |
| Housing Material | Thermoplastic PBT (UL94V-0) |
| Impeller Material | Thermoplastic PBT (UL94V-0) |
| Bearing Type | Precision Dual Ball Bearings |
| Operating Mode / Duty Cycle | Continuous (S1) |
| Weight | 0.042 kg (0.093 lbs / 42.0 g) |
| Termination & Cable Specs | 3 Lead Wires, 28 AWG, Stripped & Tinned Ends |
| Wiring Pinout / Connection | Red (+12 VDC), Black (GND), Yellow (FG / Tachometer Signal) |
| Control / Signal Features | Frequency Generator (FG) Open-Collector Tachometer Output |
| Motor Protection | Auto Restart, Polarity Protection, Locked Rotor Protection |
| Insulation Resistance | Min. 10 MΩ at 500 VDC between frame and (+) terminal |
| Dielectric Strength | 500 VAC for 1 minute or 600 VAC for 2 seconds (5 mA max) |
| Operating Temperature | -10°C to +70°C (+14°F to +158°F) |
| Storage Temperature | -40°C to +70°C (-40°F to +158°F) |
| Operating Humidity | 5% to 90% RH (non-condensing) |
| Standards & Compliance | cURus, TUV, CE, CCC, RoHS3 |
Applications
The Sunon PF40281B1-1000U-G9H axial cooling fan is engineered for space-constrained, high-impedance thermal architectures found across enterprise 1U and 2U rack-mount servers, high-density PoE network switches, and optical routing chassis. It serves as an essential active cooling component within telecom power rectifiers, embedded industrial computing enclosures, and modular instrumentation drawers requiring forceful air delivery through fine-pitch heatsinks. Maintenance technicians and OEM builders rely on this unit for mission-critical thermal management in high-throughput data communication equipment and specialized laboratory diagnostic systems.
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