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| Part Number | HM-31066-000 | HM-31308-P113 | HM-31308-P137 |
| Manufacturer | Knowles | Knowles | Knowles |
| Series | HM | - | - |
| Packaging | Bulk | Bulk | Tray |
| Product Status | Obsolete | Obsolete | Active |
| Type | - | Electret Condenser | - |
| Output Type | Analog | Analog | - |
| Direction | - | - | - |
| Frequency Range | 100 Hz ~ 10 kHz | 100 Hz ~ 10 kHz | - |
| Sensitivity | -20dB ±3dB @ 94dB SPL | -32dB ±3dB @ 94dB SPL | - |
| S/N Ratio | 66dB | 62dB | - |
| Impedance | 500 Ohms | 500 Ohms | - |
| Voltage - Rated | 3 V | 3 V | - |
| Voltage Range | - | 2.5 V ~ 5.5 V | - |
| Current - Supply | 500 µA | 500 µA | - |
| Port Location | - | Bottom | - |
| Ratings | - | IP67 - Dust Tight, Waterproof | - |
| Termination | - | Wire Leads | - |
| Size / Dimension | - | 0.236" Dia (6.00mm) | - |
| Height (Max) | - | 0.142" (3.60mm) | - |
| Shape | - | Circular | - |
| Grade | - | - | - |
| Qualification | - | - | - |
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