The SPW31002D is a bipolar integrated circuit produced by SeCoSGmbH company. It is designed for telephone bell replacement. It has a small current consumption and an internal threshold circuit that prevents false triggering due to power noise as well as "chirps" due to rotary dial.
The SPW31002D is a bipolar integrated circuit designed for telephone bell replacement. It comes in a compact DIP‑8 package and offers a variable oscillation frequency with few external components, low current consumption, and RoHS compliance.
The document lists absolute maximum ratings, electrical characteristics such as supply voltage, current consumption, and oscillator frequencies, as well as pin assignments and example application circuits. It also describes how the RSL terminal can be used to adjust the initiation supply current.
| Package Type | DIP‑8 |
|---|---|
| Operating Temperature Range | -40 °C to 85 °C |
| Supply Voltage (Vcc) | 30 V max |
| Power Dissipation | 500 mW |
| Initiation Supply Voltage (Vsi) | Typical 19 V |
| Sustaining Supply Voltage (Vsus) | Typical 12 V |
| Initiation Current Consumption (Isi) | Typical 3.3 mA |
| Sustaining Current Consumption (Isus) | Typical 1.4 mA |
| High‑frequency Oscillator (fH1) | Typical 512 Hz |
| Output Voltage (Vee) | 24 V |
| "L" Level Voltage (VoL) | Typical 0.7 V |
It is supplied in a compact DIP‑8 package.
The typical initiation supply voltage (Vsi) is 19 V.
By connecting a resistor (RSL) to ground from Pin 2, the initiation current (Isi) can be changed.