APT1221W

Overview

The Panasonic Electric Works APT1221W is a single-channel optoisolator featuring a Triac output, designed for high-voltage isolation applications. It provides 5000Vrms isolation voltage between input and output circuits. The device supports a maximum RMS on-state current of 100 mA and a peak off-state voltage of 600 V. Key electrical parameters include a maximum turn-on time of 100 µs and a minimum static dV/dt rating of 500 V/µs. The LED forward current maximum is 50 mA with a typical forward voltage of 1.21 V. It operates within a temperature range of -40°C to 100°C and is available in a 4-DIP Gull Wing package.

Feature Summary

• Provides robust 5000Vrms electrical isolation for safe signal transmission across potential barriers.
• Features a low zero-cross voltage characteristic to significantly reduce electromagnetic interference and device noise.
• Delivers fast switching performance with a maximum turn-on time of 100 µs for efficient control.

Applications

• Solid-state relay driver circuits requiring high isolation
• AC power switching control systems
• Industrial automation interfaces

Procurement Notes

Verify the specific suffix designation to ensure compatibility with required packaging or lead-free specifications. Confirm that the 5000Vrms isolation rating meets safety standards for the target application environment. Cross-reference the 600V blocking voltage against peak line voltages to prevent breakdown. Ensure the operating temperature range aligns with system thermal management capabilities.

Selection Notes

Select this component when high-voltage isolation and low-noise AC switching are critical. The Triac output is suitable for direct driving of resistive or inductive loads. Consider the 100mA current limit for load sizing. The absence of an integrated zero-crossing detector allows for phase-angle control flexibility, though external timing may be required for precise synchronization.

Part Context

This part belongs to the APT series of phototriac couplers from Panasonic Electric Works. It serves as a bridge between low-voltage control logic and high-voltage AC power stages. The design emphasizes noise reduction through low zero-cross voltage characteristics, distinguishing it from standard triac outputs in industrial optocoupler families.

Replacement Considerations

The APT1221AX is documented as a substitute part number by the manufacturer. Verify pinout compatibility and electrical parameter equivalence before substitution. Ensure the alternative maintains the 5000Vrms isolation rating and 600V blocking voltage requirements.

FAQ

Does the APT1221W include an internal zero-crossing detection circuit?

No, the device does not have an integrated zero-crossing circuit, allowing for flexible phase-control applications.

What is the maximum off-state voltage rating for this optoisolator?

The device supports a maximum off-state voltage of 600 V.