Hammond 102B 50:1500 Ohm Epoxy Potted PCB Input Transformer
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Create Free Business AccountKey Features
- 50 ohm primary to 1500 ohm secondary input transformer
- 20 mW output, 1.5 dB insertion loss
- -1 dB low frequency roll-off at 310 Hz
- DCR 4 ohms primary, 95 ohms secondary (+/- 15%)
- 0 mA max primary DC
- Black epoxy potted, completely sealed; 100 V peak working voltage
- 0.025 in square PCB pins
The 102B is a miniature input audio transformer from the 102 Series. It steps a 50 ohm primary up to a 1500 ohm secondary and is built for P.C. board mounting, which suits audio designers bringing a low-impedance source into a higher-impedance input stage.
The part is encapsulated in rugged black epoxy, producing a completely sealed unit. Terminals are square pins, 0.025 in square typical, and any connection that is not used simply has no pin. The 102B appears as drawing figure 1 in the series table.
Electrically, the 102B is rated for 20 mW output with 1.5 dB insertion loss and a low frequency roll-off of 310 Hz at -1 dB. DC resistance is 4 ohms primary and 95 ohms secondary, both +/- 15%. Maximum primary DC current is 0 mA, so the primary is not rated to carry DC. Peak working voltage is 100 V.
This part is RoHS and REACH compliant, with a shipping weight of 0.02 lbs (0.01 kg). For more economical open-type P.C. mount alternatives the series notes point to the 148 and 149 series.
Ideal For
- Low-impedance audio input stages
- Matching a 50 ohm source to a 1500 ohm input on PCBs
- Sealed audio input circuits
Overview
| Series | 102 Series Miniature Audio Epoxy Potted |
| Description | Audio transformer, potted, primary 50 ohms, secondary 1500 ohms |
| Product Type | Audio transformer, potted |
| Short Description | AUDIO TX INPUT POTTED |
| Typical Application | Input |
Dimensions
| Drawing Figure | 1 |
Electrical
| Output Power | 20 mW |
| Insertion Loss | 1.5 dB |
| Peak Working Voltage | 100V |
| Max. Primary DC Current | 0 mA |
| Primary Nominal Impedance | 50 ohms |
| Secondary Nominal Impedance | 1500 ohms |
| Low Frequency Roll Off (-1 DB) | 310 Hz |
| Primary DC Resistance (+/- 15%) | 4 ohms |
| Secondary DC Resistance (+/- 15%) | 95 ohms |
Identifiers
| UPC | 623980178707 |
| UNSPSC | 39121301 |
Packaging & Shipping
| Shipping Weight | 0.02 lbs (0.01 kg) |
Construction & Finish
| Mounting | P.C. board mount |
| Pin Type | Square pin, 0.025 in square typical |
| Construction | Rugged black epoxy potted construction; completely sealed unit |
| Unused Connections | If a connection is not used, no pin will exist |
Compliance & Certifications
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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Frequently Asked Questions
What is the 102B used for?▾
Its typical application is as an input transformer, stepping a 50 ohm primary to a 1500 ohm secondary.
Can the primary carry DC current?▾
No. Maximum primary DC current is listed as 0 mA.
What is its low-frequency limit?▾
Roll-off is -1 dB at 310 Hz.
What pins does it use?▾
Square pins, 0.025 in square typical, for P.C. board mounting.
What is the peak working voltage?▾
100 V.
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