FTZ4.3ET148

Overview

The FTZ4.3ET148 is a quad Zener diode array manufactured by ROHM Semiconductor, designed for terminal protection applications. It features four independent Zener chips in a single SOT-25T (SC-74A) package with five terminals. The typical Zener voltage is 4.3 V, with a minimum of 4.04 V and a maximum of 4.57 V at a test current of 5 mA. The device has a power dissipation rating of 200 mW and operates within a junction temperature range of -55°C to +150°C. It complies with IEC61000-4-2 standards, offering 8 kV contact and 15 kV air electrostatic discharge protection.

Feature Summary

• Integrates four Zener diodes in a compact surface-mount package for space-constrained designs.
• Provides robust electrostatic discharge protection compliant with IEC61000-4-2 standards.
• Features a common anode configuration suitable for multi-channel signal line protection.

Applications

• Terminal protection for electronic devices against electrostatic discharge.
• Clamping circuits for multiple signal lines requiring common reference.
• Protection interfaces in consumer electronics subject to IEC61000-4-2 requirements.

Procurement Notes

Verify the specific ordering suffix and tape/reel specifications when sourcing components. Confirm that the application does not require automotive qualification, as this standard-grade product is not recommended for车载 equipment. Ensure the design accounts for the 200 mW power dissipation limit under expected operating conditions.

Selection Notes

Select this component when multiple channels require clamping to a common ground or supply rail. The 4.3 V nominal voltage suits low-voltage signal lines. Consider the SC-74A footprint compatibility during PCB layout. Verify that the 5 mA test current aligns with the target circuit's leakage and clamping requirements.

Part Context

This part belongs to the FTZ series of Zener arrays from ROHM Semiconductor. It shares the SOT-25T package form factor with other quad configurations in the lineup but differs in Zener voltage ratings. The ET148 suffix indicates the specific packaging and taping format used for automated assembly processes.

Replacement Considerations

Direct substitutes must match the quad configuration, 4.3 V Zener voltage, and SOT-25T package. Check alternative manufacturers for equivalent IEC61000-4-2 performance ratings. Verify pinout compatibility, specifically the common anode arrangement, before integration into existing designs.