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| PartNumber | BT-21752-000 | BT-21751-005 | BT-21751-000 |
| Description | Microphones | Microphones | Microphones |
| Manufacturer | Knowles | Knowles | Knowles |
| Product Category | Microphones | Microphones | Microphones |
| Series | BT | - | BT |
| Type | Electret Condenser | - | Electret Condenser |
| Packaging | Bulk | - | Bulk |
| Current Rating | 40 uA | - | 40 uA |
| Termination Style | Solder Pad | - | Solder Pad |
| Length | 7.87 mm | - | 7.87 mm |
| Width | 5.54 mm | - | 5.54 mm |
| Impedance | 3.5 kOhm | - | 3.5 kOhm |
| Termination | Solder Pads | - | Solder Pads |
| Voltage Rated | 1.3V | - | 1.3V |
| Current Supply | 40μA | - | 40μA |
| Port Location | Side | - | Side |
| Size Dimension | 7.87mm L x 5.54mm W | - | 7.87mm L x 5.54mm W |
| Output Type | Analog | - | Analog |
| Direction | - | - | - |
| Frequency Range | 100Hz ~ 4.2kHz | - | 100Hz ~ 4.2kHz |
| Sensitivity | -60dB ±3dB @ 74dB SPL | - | -61.5dB ±1.5dB @ 74dB SPL |
| S N Ratio | - | - | - |
| Seal Rating | None | - | None |
| Height Max | 2.24mm | - | 2.24mm |
| Shape | Rectangular | - | Rectangular |
| Operating Supply Voltage | 1.3 VDC | - | 1.3 VDC |
| Depth | 2.24 mm | - | 2.24 mm |
| Length in | 0.31 in | - | 0.31 in |
| Length mm | 7.87 mm | - | 7.87 mm |
| Width in | 0.218 in | - | 0.218 in |
| Width mm | 5.54 mm | - | 5.54 mm |
| Directional Properties | - | - | Omnidirectional |