Description
ebm-papst 252/2N (also known as 2522N) is an ultra-compact brushless DC axial cooling fan engineered in a space-saving 25 x 25 x 8 mm (0.98 x 0.98 x 0.31 in) miniature square profile. Operating on a nominal 12 VDC supply, it delivers 2.0 CFM (3.4 m³/h) of airflow and a maximum static pressure of 28 Pa (0.112 in H₂O) at 9,000 RPM while drawing a meager 0.45 W of power. Built with lightweight PBT plastic housing and impeller, the unit incorporates a Sintec sleeve bearing system, an integrated open-collector frequency generator (tachometer) output, and impedance protection against locked-rotor events.
Key Features
- Ultra-Compact Profile: Miniature 25x25x8 mm frame designed for high-density electronic assemblies and space-restricted enclosures.
- Whisper-Quiet Operation: Generates a sound pressure level of only 15.0 dB(A) for noise-sensitive operating environments.
- Integrated Tachometer Output: Features an open collector speed sensor lead providing continuous closed-loop RPM monitoring.
- Robust Electrical Protection: Incorporates built-in reverse polarity diode protection and impedance protection against locked-rotor overload.
- Reliable Bearing System: Engineered with ebm-papst Sintec sleeve bearings delivering up to 40,000 hours of continuous service life.
Technical Specifications
| Manufacturer | ebm-papst |
|---|---|
| Manufacturer Part Number (MPN) | 252/2N |
| Alternate Part Number | 2522N |
| Product Series | 250 |
| Product Category | DC Axial Fans |
| Fan / Component Type | Tubeaxial Cooling Fan |
| Phase & Supply Type | DC |
| Rated Voltage | 12 VDC |
| Operating Voltage Range | 10.0 to 14.0 VDC |
| Speed (RPM) | 9,000 RPM (7,500 RPM at 10 VDC / 10,500 RPM at 14 VDC) |
| Power Rating | 0.45 W (0.30 W at 10 VDC / 0.60 W at 14 VDC) |
| Rated Current | 38 mA (33 mA at 10 VDC / 43 mA at 14 VDC) |
| Starting Current | 55 mA |
| Locked Rotor Current | 55 mA |
| Airflow | 2.0 CFM (3.4 m³/h) |
| Static Pressure | 0.112 in H₂O (28 Pa) |
| Noise Level | 15.0 dB(A) |
| Sound Power Level | 3.0 Bel(A) |
| Airflow Direction | Air outlet over struts |
| Direction of Rotation | Counterclockwise (viewed looking at rotor) |
| Dimensions (L × H × D) | 25.0 × 25.0 × 8.0 mm (0.98 × 0.98 × 0.31 in) |
| Housing Material | Plastic (PBT) |
| Impeller Material | Plastic (PA) |
| Bearing Type | Sintec Sleeve Bearing |
| Installation Position | Any (horizontal or vertical) |
| Max. Mounting Torque | 20 N·cm (ISO 4762 – M2.5 screw without washer) |
| Weight | 0.005 kg (0.011 lbs / 5 g) |
| Termination & Cable Specs | 3 Lead Wires, AWG 28, Length 160 mm (6.3 in), Insulation Ø 0.90 mm |
| Wiring Pinout / Connection | Red = +UB, Blue = -GND, White = Tacho Output (/2) |
| Control / Signal Features | Open Collector Tachometer Output (Type /2, UBS <= 30V, Isink <= 2 mA, 300 Hz at 9000 RPM) |
| Tachometer Slew Rate | >= 0.5 V/µs |
| Motor Protection | Impedance Protected (Locked Rotor) & Reverse Polarity Protection Diode |
| Max. Reverse Current | <= 30 µA |
| Electrical Protection Class | Class III |
| Insulation Resistance | RI > 10 MΩ (at 500 VDC for 1 min after 48h at 95% RH) |
| Clearance / Creepage Distance | 1.0 mm / 1.2 mm |
| Pollution Degree | Pollution Degree 1 (acc. to DIN EN 60664-1) |
| Operating Temperature | -10 to +70 °C (14 to +158 °F) |
| Storage Temperature | -40 to +80 °C (-40 to +176 °F) |
| Climatic Resistance | Humid heat constant per DIN EN 60068-2-78 (14 days) |
| Service Life (L10) | 40,000 h at 20 °C / 22,500 h at 40 °C / 12,000 h at 60 °C / 9,000 h at 70 °C |
| Standards & Compliance | CE, EAC, UL (UL507), VDE (EN 60950), CSA (C22.2 No. 113), RoHS3 |
Applications
ebm-papst 252/2N miniature axial fans are specifically deployed for localized spot cooling within space-constrained telecom rectifiers, optical transceivers, and modular enterprise Ethernet switches. They provide critical forced-air thermal dissipation for embedded industrial PCs, compact single-board computers, and portable medical diagnostic equipment. System integrators and MRO technicians rely on this micro-fan assembly inside compact laboratory test instrumentation and audiovisual broadcast micro-chassis.
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