The 104B is a miniature input audio transformer from the 104 Series with a very high step-up: a 150 ohm primary into an 80000 ohm secondary. It is designed for P.C. board mounting and suits designers feeding a low-impedance source into a high-impedance input.
Rugged black epoxy potting produces a completely sealed unit that withstands severe environmental conditions, including those of MIL-T-27 (Grade 5, Class S). The 104B uses 0.025 in square pins (drawing tolerance +/-0.005 in) with a series pin length of 0.11 in +/-15%. Unused connections have no pin. The drawing marks the part with a white dot and a stamp on top, and sets a +/-0.030 in tolerance for dimensions not otherwise stated.
Series table ratings are 5 mW output, 1 dB insertion loss and a -1 dB low frequency roll-off at 60 Hz. DC resistance is 6.6 ohms primary and 3730 ohms secondary, +/- 15%, and maximum primary DC is 0 mA. Peak working voltage is 200 V. The drawing rates the 104B at 5 mW over 60 Hz - 20 kHz at a 1 kHz 0 dB level, with 0 mA DC. Its production tests list:
This part is RoHS and REACH compliant and ships at 0.1 lbs (0.05 kg). It follows drawing figure 5.
| Series | 104 Series Miniature Audio Epoxy Potted |
| Description | Audio transformer, potted, primary 150 ohms, secondary 80000 ohms |
| Product Type | Audio transformer, potted |
| Short Description | AUDIO TX INPUT POTTED |
| Typical Application | Input |
| Drawing Figure | 5 |
| Dimension Tolerance When Not Stated | +/-0.030 in |
| Output Power | 5 mW |
| Drawing Rating | 5 mW, 60 Hz - 20 kHz @ 1 kHz 0 dB level, 0 mA DC |
| Insertion Loss | 1 dB |
| Peak Working Voltage | 200V |
| Max. Primary D.C. Current | 0 mA |
| Primary Nominal Impedance | 150 ohms |
| Hipot, Primary - Secondary | 250 V, 60 Hz, 1 sec |
| Secondary Nominal Impedance | 80000 ohms |
| Low Frequency Roll Off (-1 DB) | 60 Hz |
| Drawing Schematic Winding Labels | Primary 150 CT, secondary 80k CT |
| DCR @ 20 Degrees C, Pin 1 - Pin 3 | 6.600 ohms +/-15% |
| DCR @ 20 Degrees C, Pin 4 - Pin 6 | 3760 ohms +/-15% |
| Primary D.C. Resistance (+/- 15%) | 6.6 ohms |
| Secondary D.C. Resistance (+/- 15%) | 3730 ohms |
| Excitation Current (Iex) @ 0.9 V, 60 Hz, Pin 1 - Pin 3 | 4.8 mA max. |
| Sec. No-Load Voltage @ 0.9 V, 60 Hz On Pins 1-3: Pin 4 - Pin 6 | 20.88 V +/-2% |
| UPC | 623980179704 |
| UNSPSC | 39121301 |
| Shipping Weight | 0.1 lbs (0.05 kg) |
| Marking | White dot; stamp on top |
| Mounting | P.C. board mount |
| Pin Type | Square pin, 0.025 in square typical |
| Pin Length | 0.11 in +/-15% |
| Construction | Rugged black epoxy potted construction; completely sealed unit withstanding severe environmental conditions |
| Pin Size (Drawing) | 0.025 in SQ pin +/-0.005 |
| Unused Connections | If a connection is not used, no pin will exist |
| Environmental Rating | Withstands conditions including those of MIL-T-27 (Grade 5, Class S) |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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It couples a 150 ohm primary to an 80000 ohm secondary.
The drawing rates it at 5 mW from 60 Hz to 20 kHz at a 1 kHz 0 dB level. The series table gives a -1 dB low frequency roll-off at 60 Hz.
The series construction withstands severe environmental conditions including those of MIL-T-27 (Grade 5, Class S).
250 V, 60 Hz for 1 second, primary to secondary.
No. Maximum primary DC is 0 mA.
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