Description
Sunon PF40561BX-1000U-S9H (also known as PF40561BX1000US9H) is a high-pressure 40 x 40 x 56 mm (1.57 x 1.57 x 2.20 in) dual counter-rotating DC tubeaxial cooling fan engineered for dense thermal enclosures. Operating on a nominal 12 VDC supply, the dual-rotor assembly delivers a synchronized speed of 21,500 RPM on the intake impeller and 18,000 RPM on the exhaust impeller, generating an airflow rating of 31.7 CFM (53.86 m³/h) and an impressive static pressure of 3.76 in H₂O (935.6 Pa). Built with UL 94V-0 rated thermoplastic PBT housings and dual precision ball bearings, the unit draws 1.390 A (16.68 W average) under continuous duty. The motor incorporates locked-rotor auto-restart, reverse polarity protection, integrated frequency generator (FG) tachometer speed feedback, and 25 kHz PWM input control.
Key Features
- Counter-Rotating Impellers: Dual motorized stages achieve 21,500/18,000 RPM to overcome extreme static backpressure in confined channels.
- Extreme Static Pressure: Delivers 3.76 in H₂O static head and 31.7 CFM airflow for dense thermal packaging.
- Precision Ball Bearings: Heavy-duty mechanical ball bearing system guarantees 70,000 hours of continuous service life at 40°C.
- Intelligent Signal Control: Integrated open-collector FG tachometer feedback and wide-range PWM speed control allow fine thermal throttling.
- Comprehensive Motor Safety: Features automatic locked-rotor recovery restart within 10 seconds and polarity protection in a UL94V-0 frame.
Technical Specifications
| Manufacturer | Sunon |
|---|---|
| Manufacturer Part Number (MPN) | PF40561BX-1000U-S9H |
| Alternate Part Number | PF40561BX1000US9H |
| Product Series | PF Series |
| Product Category | DC Axial Fans |
| Fan / Component Type | Dual Counter-Rotating DC Tubeaxial Fan |
| Phase & Supply Type | DC Brushless |
| Rated Voltage | 12 VDC |
| Operating Voltage Range | 10.2 to 13.2 VDC |
| Min. Starting Voltage | 10.2 VDC (at 25°C power on/off) |
| Rated Speed | 21500 RPM (Inlet) / 18000 RPM (Outlet) ± 10% |
| Rated Current (Avg.) | 1.390 A |
| Max. Current Draw | 1.599 A |
| Power Rating (Avg.) | 16.68 W |
| Max. Input Power | 19.19 W |
| Safety Power Consumption | 20.70 W |
| Airflow at Zero Static Pressure (Nominal) | 31.7 CFM (53.86 m³/h / 0.898 m³/min) |
| Static Pressure at Zero Airflow (Nominal) | 3.76 in H₂O (935.6 Pa / 95.5 mmH₂O) |
| Acoustical Noise (Nominal) | 65.9 dB(A) |
| Noise Test Standard | Semi-anechoic chamber at 1 m intake distance, shaft horizontal |
| Airflow Direction | Axial exhaust through dual counter-rotating stages |
| Direction of Rotation | Counter-Clockwise (viewed from blade side) |
| Dimensions (L × H × D) | 40 x 40 x 56 mm (1.57 x 1.57 x 2.20 in) |
| Weight | 87 g (0.192 lbs / 0.087 kg) |
| Bearing Type | Precise Ball Bearing System |
| Housing Material | Thermoplastic PBT (UL 94V-0) |
| Impeller Material | Thermoplastic PBT (UL 94V-0) |
| Mounting Screw Specification | M3.0 JIS B1111-1974 Pan Head Machine Screw (Torque: 1 to 2 kgf-cm) |
| Termination & Cable Specs | Lead wires (UL Style leads, 4-wire interface) |
| Speed Control Input | Pulse Width Modulation (PWM) |
| PWM Operating Frequency | 100 Hz to 50 kHz (Typical: 25 kHz) |
| PWM Signal Voltage High (VH) | 2.3 to 5.5 V (Typical: 5.0 V) |
| PWM Signal Voltage Low (VL) | 0 to 0.8 V |
| PWM Duty Cycle Range | 0% to 100% (Min. start up duty cycle: 10%) |
| PWM Open Pin Behavior | Defaults to maximum speed if PWM input is unconnected |
| Tachometer Output Signal | Frequency Generator (FG) Open-Collector Type |
| FG Supply Voltage (V+) | 3 VDC to Vcc |
| FG Output Sink Current (If) | 5 mA Max. |
| FG Output Voltage Low (VL) | 0.5 V Max. |
| FG Pulses per Revolution | 2 pulses per revolution (4 states per rotation) |
| Motor Protection | Automatic Restart & Polarity Protection |
| Auto Restart Delay | Auto restart within 10 seconds following rotor unlock |
| Insulation Type | UL Class A |
| Insulation Resistance | 10 MΩ min. at 500 VDC between frame and (+) terminal |
| Dielectric Strength | 5 mA max. at 500 VAC 50/60 Hz for 1 minute between frame and (+) terminal |
| Operating Temperature Range | -10 °C to +70 °C (14 °F to 158 °F) |
| Storage Temperature Range | -40 °C to +80 °C (-40 °F to 176 °F) |
| Operating Humidity Range | 5% to 90% RH |
| Storage Humidity Range | 5% to 95% RH |
| Shock Proof Resistance | 100G acceleration in X, Y, Z axes for 2 ms duration |
| Vibration Proof Resistance | 2 mm amplitude at 5-55-5 Hz in X, Y, Z axes (3 hours total) |
| Service Life Expectancy | 70,000 Hours (L10 at 40 °C, 15% to 65% RH) |
| Agency Certifications | cURus, TUV, CE, CCC |
| Environmental Compliance | RoHS Directive 2011/65/EU, REACH, Halogen-Free Compliant |
Applications
Sunon PF40561BX-1000U-S9H dual axial fan is engineered specifically for ultra-dense 1U rackmount server chassis, high-throughput network switches, and modular optical transport equipment. It delivers targeted forced-air cooling across dense processor heatsinks, high-speed ASIC routing boards, and redundant telecom power rectifier shelves where air impedance is exceptionally high. Additionally, field technicians and system architects rely on this unit for replacement and upgrade duties inside compact industrial computing nodes, edge AI accelerator boxes, and medical imaging backplanes.
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