Description
The Delta BFB03505HHA-A (also known as BFB03505HHAA) is an ultra-compact single-inlet DC centrifugal blower engineered with an integrated single-phase, eight-pole brushless motor housed in a precision 35 × 35 × 10 mm (1.38 × 1.38 × 0.39 in) scroll enclosure. Operating at a nominal 5 VDC, this micro blower delivers a rated speed of 8500 RPM, generating an airflow of 2.12 CFM (0.060 m³/min) against static back pressures up to 0.443 in H₂O (110.3 Pa). Robustly manufactured from UL 94V-0 flame-retardant plastic, it integrates dual precision ball bearings, UL Class A insulation, and comprehensive locked-rotor and reverse-polarity protection. Electrical connection is cleanly established via UL 1571 AWG #28 lead wires, ensuring reliable localized heat dissipation in restricted spaces.
Key Features
- High-Pressure Aerodynamics: Delivers 2.12 CFM airflow and 0.443 in H₂O back pressure for tight enclosures.
- Dual Ball Bearings: Heavy-duty dual ball bearing system ensures a continuous operating life exceeding 30,000 hours.
- Compact Scroll Geometry: Space-saving 35x35x10mm open-type blower housing channels concentrated air into narrow thermal ducts.
- Comprehensive Circuit Safety: Integrated impedance locked-rotor protection withstands continuous stall while reverse-polarity defense prevents installation damage.
Technical Specifications
| Manufacturer | Delta |
|---|---|
| Manufacturer Part Number (MPN) | BFB03505HHA-A |
| Alternate Part Number | BFB03505HHAA |
| Product Series | BFB Series |
| Product Category | DC Blower Fans |
| Fan / Component Type | DC Brushless Centrifugal Scroll Blower |
| Motor Type | Single Phase, 8 Poles Brushless DC Motor |
| Phase & Supply Type | DC |
| Rated Voltage | 5 VDC |
| Operating Voltage Range | 4.0 to 5.5 VDC |
| Rated Current | 0.15 A (Max. 0.23 A) |
| Power Rating | 0.75 W (Max. 1.15 W) |
| Speed (RPM) | 8500 RPM |
| Airflow | 2.12 CFM (0.060 m³/min) [Min. 1.70 CFM / 0.048 m³/min] |
| Static Pressure | 0.443 in H₂O (110.3 Pa / 11.25 mmH₂O) [Min. 0.283 in H₂O / 70.6 Pa] |
| Noise Level | 31.0 dB(A) (Max. 36.0 dB(A)) |
| Dimensions (L × H × D) | 35 × 35 × 10.0 mm (1.38 × 1.38 × 0.39 in) |
| Housing Material | Plastic (UL 94V-0) |
| Impeller Material | Plastic (UL 94V-0) |
| External Cover Construction | Open Type |
| Bearing Type | Two Ball Bearings |
| Direction of Rotation | Counterclockwise (viewed from front airflow inlet) |
| Weight | 0.024 lbs (11.0 g) |
| Termination & Cable Specs | 2 Lead Wires, UL 1571 AWG #28 |
| Wiring Pinout / Connection | Red Wire: Positive (+), Black Wire: Negative (-) |
| Motor Protection | Locked Rotor Protection (Impedance Protected up to 96 Hours), Polarity Protection |
| Insulation Class | UL Class A |
| Insulation Resistance | 10 MΩ min. at 500 VDC (between frame and positive terminal) |
| Dielectric Strength | 5 mA max. at 500 VAC, 60 Hz for 1 minute (between frame and positive terminal) |
| Operating Temperature | -10 to +70 °C (14 to 158 °F) |
| Storage Temperature | -40 to +75 °C (-40 to 167 °F) |
| Operating Humidity | 5 to 90% RH |
| Storage Humidity | 5 to 95% RH |
| Service Life (L10) | 30,000 Hours continuous operation at 40 °C (15 to 65% RH) |
| Standards & Compliance | CE, CSA, UL, VDE, RoHS3 Compliant |
Applications
The Delta BFB03505HHA-A micro centrifugal blower delivers targeted spot-cooling within ultra-compact electronics and densely packed OEM architectures. It is commonly integrated into portable medical diagnostic analyzers, handheld instrumentation, and compact embedded IPC motherboards where high static pressure is required to push air through cramped heat sink fins. Thermal engineers also specify this blower for pico projectors, point-of-sale terminals, and miniature telecommunication devices requiring reliable continuous duty.
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