TLP121(F)

Overview

The TLP121(F) is a single-channel transistor output optocoupler manufactured by Toshiba Semiconductor and Storage. It features a gallium arsenide infrared emitting diode optically coupled to a photo-transistor in a mini flat DIP-4 plastic package. Key electrical parameters include a minimum collector-emitter breakdown voltage of 80 V, a nominal current transfer ratio of 100%, and a maximum forward current of 50 mA. The device supports an isolation voltage of 3750 Vrms and operates within a temperature range of -25 °C to 85 °C.

Feature Summary

• Integrates a GaAs infrared LED with a photo-transistor for signal isolation
• Provides high insulation capability with 3750 Vrms isolation voltage
• Designed for surface mount assembly using a compact mini flat DIP-4 package

Applications

• Office machines such as copiers and laser beam printers
• Programmable controllers and AC/DC input modules
• Telecommunication equipment interfaces

Procurement Notes

Verify the specific suffix designation against official Toshiba documentation to confirm pinout configuration and lead material specifications. Ensure compliance with relevant safety standards such as UL recognition (File No. E67349) if required for the target application. Confirm that the component meets RoHS directives applicable to the region of use.

Selection Notes

Select this component when a small form factor is required for isolating low-speed digital signals. The transistor output type is suitable for general switching applications rather than high-speed logic transmission. Consider the 80 V collector-emitter voltage limit and the 100 nA maximum dark current when designing circuits sensitive to leakage or requiring higher voltage tolerance.

Part Context

This part belongs to the TLP121 series of mini flat couplers designed for surface mount technology. It represents a compact alternative to traditional through-hole optocouplers, allowing for denser PCB layouts. The series is widely utilized in industrial and consumer electronics where space constraints and reliable galvanic isolation are critical design factors.

Replacement Considerations

TLP121(GR-TPR)