Description
The Nidec W38S12BS1B5-57 (also known as W38S12BS1B557) is a high-performance 38 x 38 x 28 mm (1.50 x 1.50 x 1.10 in) DC brushless tubeaxial cooling fan from the UltraFlo series designed for dense 1U rackmount enclosures. Operating on a nominal 12 VDC supply, it generates an impressive 21.1 CFM (36.0 m³/h) of airflow and a formidable static back pressure of 3.59 in H₂O (895 Pa) at a nominal speed of 25,000 RPM, consuming just 9.24 W. Constructed with flame-retardant UL94 V-0 glass-fiber reinforced PBT housing and impeller, the fan utilizes precision dual ball bearings rated for 70,000 hours of continuous L10 operation at 40°C. Factory termination consists of four 300 mm UL10368 AWG26 lead wires providing dedicated connections for power, ground, open-collector tachometer frequency generator output, and high-frequency PWM speed control.
Key Features
- Extreme Pressure Output: Generates up to 3.59 in H₂O static back pressure to penetrate ultra-dense 1U heatsink assemblies.
- Precision Speed Control: Accepts 20 kHz to 30 kHz PWM duty input paired with open-collector tachometer speed feedback.
- Industrial Ball Bearings: Heavy-duty dual ball bearing system delivers 70,000 hours continuous service life at 40°C.
- Robust Circuit Protection: Features integrated auto-restart current-limiting locked rotor protection alongside reverse polarity safeguards.
- Flame-Retardant Construction: Precision-molded PBT housing and impeller meet rigorous UL94 V-0 safety standards for networking enclosures.
Technical Specifications
| Manufacturer | Nidec Components (Nidec ) |
|---|---|
| Manufacturer Part Number (MPN) | W38S12BS1B5-57 |
| Alternate Part Number | W38S12BS1B557 |
| Product Series | UltraFlo |
| Product Category | DC Axial Fans |
| Fan / Component Type | Brushless DC Tubeaxial Fan (Single Rotor) |
| Supply Type | DC |
| Rated Voltage | 12 VDC |
| Operating Voltage Range | 10.8 to 13.2 VDC |
| Rated Current | 0.77 A (Nominal) |
| Max. Current Draw | 0.84 A (Max. in free air) |
| Power Rating | 9.24 W (Nominal) |
| Max. Power Input | 10.08 W (Max.) |
| Speed (RPM) | 25,000 RPM (min-1 Nominal) |
| Min. Speed Rating | 22,500 RPM (min-1 at rated voltage) |
| Max. Speed Rating | 27,500 RPM (min-1 at rated voltage) |
| Low Speed (0% PWM) | 3,000 ± 1,500 RPM |
| Airflow | 21.1 CFM (36.0 m³/h / 0.60 m³/min) |
| Min. Airflow Rating | 18.0 CFM (30.6 m³/h / 0.51 m³/min) |
| Static Pressure | 3.59 in H₂O (895 Pa Nominal) |
| Min. Static Pressure Rating | 2.76 in H₂O (688 Pa) |
| Noise Level | 59.5 dB(A) (Nominal) |
| Max. Acoustic Noise | 66.0 dB(A) |
| Airflow Direction | Air discharge over label side (intake over impeller) |
| Direction of Rotation | Clockwise looking from label / strut side |
| Dimensions (L × H × D) | 38.0 × 38.0 × 28.0 mm (1.50 × 1.50 × 1.10 in) |
| Mounting Hole Pitch | 30.0 ± 0.2 mm (1.18 in) |
| Mounting Hole Diameter | 4.0 ± 0.25 mm (0.157 in, 8 holes total) |
| Housing Material | Glass-Fiber Reinforced PBT (UL94 V-0, PBT-GF30) |
| Impeller Material | Glass-Fiber Reinforced PBT (UL94 V-0) |
| Bearing Type | Dual Ball Bearings |
| Weight | 0.060 kg (0.132 lbs / approx. 60 g) |
| Termination & Cable Specs | 4 Lead Wires, UL10368 AWG26, Length: 300 ± 20 mm (11.8 in) |
| Wiring Pinout / Connection | Red: +12 VDC, Black: GND, Yellow: Revolution Signal (Tach / FG), Blue: PWM Control |
| Control / Signal Features | PWM Speed Control (20 kHz to 30 kHz, 3.3V/5V TTL/CMOS OD/OC) & Open Collector Tachometer Output |
| Tachometer Output Rating | Open Collector, IC max 10 mA, VOH max 15 V, VOL max 0.8 V (at 5 mA) |
| PWM Stop Duty | 10% ± 5% |
| Motor Protection | Automatic Restart Current-Limiting Protection & Reverse Polarity Protection |
| Locked Rotor Withstand | Continuous locked rotor withstand for 1 hour without damage |
| Insulation Resistance | Min. 10 MΩ at 500 VDC between frame and lead wires |
| Dielectric Strength | 500 VAC for 1 minute (Max. 1 mA between frame and lead wires) |
| Operating Temperature | -10°C to +70°C (14°F to 158°F, normal humidity) |
| Storage Temperature | -40°C to +75°C (-40°F to 167°F, normal humidity) |
| Operating / Storage Humidity | 60% to 65% RH (Normal Humidity) |
| Service Life (L10) | 70,000 hours at 40°C (104°F) & 65% RH |
| Vibration Resistance | 0.2 mm amplitude, 55 Hz for 30 min in X, Y, Z axes |
| Mechanical Shock Resistance | Free fall 30 cm natural drop in packaged container |
| Standards & Compliance | RoHS3 Compliant (IEC62321 PBB/PBDE < 300 ppm), UL94 V-0 Flammability |
Applications
The Nidec W38S12BS1B5-57 compact brushless tubeaxial fan delivers high-static forced-air cooling for dense communication infrastructure and mission-critical compute architectures. It is purpose-built for 1U rackmount server chassis, modular telecom rectifiers, optical routing transceivers, and high-port-density enterprise network switches where restricted airflow cavities require high-pressure displacement. Furthermore, this component serves as an exact OEM replacement fan in embedded industrial box PCs, high-frequency RF power amplifiers, and automated medical diagnostic instrumentation.
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