Description
The Sunon PF40281B3-1000U-A9H (also known as PF40281B31000UA9H) is a compact, high-static-pressure DC brushless tubeaxial cooling fan measuring 40 × 40 × 28 mm (1.57 × 1.57 × 1.10 in). Operating on a nominal 12 VDC supply with an operating range of 6.0 to 13.2 VDC, it delivers an impressive nominal airflow of 15.4 CFM (26.16 m³/h) and static pressure of 0.78 in H₂O (194.3 Pa) at 11,000 RPM. Constructed with UL 94V-0 flame-retardant thermoplastic PBT frame and impeller, the unit integrates a precision dual ball bearing assembly rated for 70,000 hours of continuous service at 40 °C. Integrated protection mechanisms include reverse polarity protection and automatic locked-rotor restart recovery within 10 seconds.
Key Features
- Precision Ball Bearings: Dual ball bearing assembly delivers a continuous L10 operating life of 70,000 hours at 40 °C.
- High Static Pressure: Generates up to 0.78 in H₂O static head to overcome severe airflow impedance in dense enclosures.
- Automatic Restart Protection: Motor automatically powers down during locked-rotor events and re-engages safely within 10 seconds.
- Rugged PBT Construction: Frame and impeller molded from flame-retardant UL 94V-0 thermoplastic for high operational safety.
- Wide Voltage Range: Functions dependably across 6.0 to 13.2 VDC with a low starting threshold of 6.0 VDC.
Technical Specifications
| Manufacturer | Sunon |
|---|---|
| Manufacturer Part Number (MPN) | PF40281B3-1000U-A9H |
| Alternate Part Number | PF40281B31000UA9H |
| Sunon Sequence Number | D04165340G-00 |
| Product Series | PF Series |
| Product Category | DC Axial Fans |
| Fan / Component Type | Brushless DC Tubeaxial Fan |
| Supply Type | Direct Current (DC) |
| Rated Voltage | 12 VDC |
| Operating Voltage Range | 6.0 to 13.2 VDC |
| Min. Starting Voltage | 6.0 VDC (at 25 °C) |
| Rated Speed | 11000 RPM ± 10% |
| Power Rating (Average) | 1.74 W |
| Max. Input Power | 2.19 W |
| Safety Power Consumption | 2.19 W |
| Rated Current (Average) | 0.145 A |
| Max. Current Draw | 0.182 A |
| Airflow (Nominal) | 15.4 CFM (26.16 m³/h / 0.436 m³/min) |
| Static Pressure (Nominal) | 0.780 in H₂O (194.3 Pa / 19.81 mmH₂O) |
| Noise Level (Average) | 43.9 dB(A) (at 1 m) |
| Max. Noise Level | 50.4 dB(A) (at 1 m) |
| Airflow Direction | Intake over struts / exhaust opposite side |
| Direction of Rotation | Counter-Clockwise (CCW viewed from blade side) |
| Bearing Type | Precision Ball Bearing System |
| Dimensions (L × H × D) | 40 × 40 × 28 mm (1.57 × 1.57 × 1.10 in) |
| Housing Material | Thermoplastic PBT (UL 94V-0) |
| Impeller Material | Thermoplastic PBT (UL 94V-0) |
| Recommended Screw Specification | M3.0 (JIS B1111-1974 pan head machine screw) |
| Recommended Screw Torque | 1 to 2 kgf-cm |
| Weight | 42.0 g (0.093 lbs / 1.48 oz) |
| Termination & Cable Specs | 2 Lead Wires (UL 1007, 26 AWG) |
| Wiring Pinout / Connection | Red Wire: (+), Black Wire: (-) |
| Motor Protection | Automatic Locked-Rotor Restart & Polarity Protection |
| Auto Restart Window | Shuts down on lock; restarts within 10 seconds |
| Insulation Class | 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 min between frame and (+) |
| 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 (non-condensing) |
| Storage Humidity Range | 5% to 95% RH (non-condensing) |
| Shock Proof Resistance | 100 G force, 3 directions (X, Y, Z), 2 ms each |
| Vibration Proof Resistance | 2 mm amplitude, 5-55-5 Hz, 3 axes (X, Y, Z), 1 hr/axis (3 hrs total) |
| Service Life (L10) | 70,000 Hours at 40 °C (15% to 65% RH) |
| Standards & Compliance | UL, cURus, CE, TUV, CCC, RoHS Directive 2011/65/EU |
Applications
The Sunon PF40281B3-1000U-A9H tubeaxial cooling fan is engineered for space-constrained, high-resistance thermal architectures including 1U rack-mount servers, high-density Ethernet network switches, and modular telecom rectifiers. It delivers targeted forced-air cooling for optical transceivers, embedded industrial PCs, compact power supplies, and medical diagnostic hardware. OEM systems benefit from its reliable operation across dense server backplanes, micro-blade chassis, and industrial control electronics where compact dimensions and dependable back-pressure performance are required.
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