ISP521-1

Transistor, Photovoltaic Output Optoisolators Overview

The ISP521-1 is a single-channel phototransistor optocoupler manufactured by Isocom Components. It integrates an infrared emitting diode and an NPN silicon phototransistor within a compact DIP-4 package. The device provides electrical isolation with a maximum insulation voltage of 5300 Vrms. Key electrical parameters include a maximum forward current of 50 mA, a typical rise time of 4 μs, and a typical fall time of 3 μs. The unit operates within a temperature range of -30°C to 100°C and features a minimum collector-emitter breakdown voltage of 55 V.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Integrates an infrared LED and NPN silicon phototransistor for signal transmission
• Provides high-voltage electrical isolation between input and output circuits
• Utilizes a space-efficient dual in-line plastic package for mounting

Transistor, Photovoltaic Output Optoisolators Applications

• Logic-to-logic isolation in noisy environments
• Line receiver circuits
• Programmable current level sensors
• Power supply digital programming
• Computer and peripheral device interfaces

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific manufacturer designation when sourcing, as Isocom produces industry-standard replacements. Confirm that the component meets required UL or VDE safety certifications for your application. Ensure the DIP-4 package dimensions align with your PCB layout constraints before finalizing procurement.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component for applications requiring robust galvanic isolation with standard transistor output characteristics. Consider the 5300 Vrms isolation rating for high-voltage separation needs. Evaluate the 4 μs switching speed against system timing requirements. Verify thermal limits for operation up to 100°C in enclosed designs.

Transistor, Photovoltaic Output Optoisolators Part Context

The ISP521-1 belongs to the TLP521 series family of optically coupled isolators from Isocom Components. This series is designed as a direct replacement for common commercial optocouplers. The device maintains consistent performance standards across the family while offering specific parameter selections for diverse circuit design requirements.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

Public confirmed substitute part numbers include TLP521GB and ISP621-1. These components share similar high-density mounting phototransistor isolation characteristics. Verify pinout compatibility and electrical ratings before substituting.