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| Part Number | TO38-30886-B21 | TO38-31020-B21 | TO38-31548-B20 | TO38-31638-B21 | TO38-31018-B20 |
| Manufacturer | Knowles | Knowles | Knowles | Knowles | Knowles |
| Series | TO | TO | - | - | TO |
| Packaging | Tray | Tray | Tray | Tray | Tray |
| Product Status | Active | Active | Active | Active | Active |
| Type | Electret Condenser | Electret Condenser | - | - | Electret Condenser |
| Output Type | Analog | Analog | - | - | Analog |
| Direction | Unidirectional | Omnidirectional | - | - | Omnidirectional |
| Frequency Range | - | 80 Hz ~ 10 kHz | - | - | 80 Hz ~ 10 kHz |
| Sensitivity | - | -54dB ±3dB @ 74dB SPL | - | - | -64.5dB ±3dB @ 74dB SPL |
| S/N Ratio | - | - | - | - | - |
| Impedance | - | 4.4 kOhms | - | - | 4.4 kOhms |
| Voltage - Rated | - | - | - | - | - |
| Voltage Range | - | 0.9 V ~ 1.6 V | - | - | 0.9 V ~ 1.6 V |
| Current - Supply | - | 29 µA | - | - | 29 µA |
| Port Location | - | Side | - | - | Side |
| Ratings | - | - | - | - | - |
| Termination | - | Solder Pads | - | - | Solder Pads |
| Size / Dimension | - | 0.141" L x 0.141" W (3.57mm x 3.57mm) | - | - | 0.141" L x 0.141" W (3.57mm x 3.57mm) |
| Height (Max) | - | 0.053" (1.35mm) | - | - | 0.053" (1.35mm) |
| Shape | - | Square | - | - | Square |
| Grade | - | - | - | - | - |
| Qualification | - | - | - | - | - |
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