4N26S-TA

Overview

The Lite-On Inc. 4N26S-TA is a single-channel transistor output optocoupler designed for surface-mount applications. It features an NPN phototransistor output with a base terminal, housed in a 6-pin PDIP SMD (gull-wing) package. The device provides electrical isolation with an insulation voltage of 1500 Vrms. Key electrical parameters include a minimum current transfer ratio of 20%, a maximum collector-emitter voltage of 30 V, and a maximum collector current of 100 mA. The input forward voltage is typically 1.5 V at 80 mA, while the output saturation voltage is limited to 500 mV. Switching characteristics specify rise and fall times of 3 µs each.

Feature Summary

• Integrates an NPN phototransistor with a dedicated base terminal for enhanced switching control and faster response capabilities compared to standard configurations.
• Provides robust galvanic isolation between input and output circuits, rated for 1500 Vrms insulation voltage to protect sensitive components.
• Utilizes a compact 6-pin gull-wing surface-mount package suitable for automated assembly and space-constrained PCB layouts.

Applications

• Signal isolation in microcontroller-based digital communication interfaces
• Switching control for solid-state relays and motor drivers
• Noise immunity enhancement in industrial measurement systems

Procurement Notes

Verify the specific suffix TA against official Lite-On documentation to confirm the surface-mount gull-wing package variant. Ensure compliance with RoHS directives as indicated by manufacturer specifications. Cross-reference the Mouser number 859-4N26S-TA1 or equivalent distributor identifiers to validate authenticity and exact pinout configuration before integration into design files.

Selection Notes

Select this component when a surface-mount solution with a phototransistor base is required for improved turn-off speed. Compare the 20% minimum CTR and 3 µs switching times against system timing requirements. Consider the 1500 Vrms isolation rating for safety standards compliance. Evaluate the 6-pin SMD footprint compatibility with existing board designs versus through-hole alternatives like the standard DIP version.

Part Context

This part belongs to the 4N2x series of transistor output optocouplers manufactured by Lite-On Inc. The 'S' designation typically indicates a surface-mount variant, distinguishing it from the traditional through-hole DIP packages found in the standard 4N26 line. The inclusion of a base terminal on the phototransistor allows for external biasing or faster discharge, offering performance advantages over basic two-terminal phototransistor isolators within the same family.

Replacement Considerations

Direct substitutes include other surface-mount transistor output optocouplers with similar pinouts and electrical ratings, such as the HCPL-2630 or PC817X variants, provided they meet the 1500 Vrms isolation and 30 V collector voltage requirements. Verify that any replacement maintains the base terminal functionality if fast switching is critical.