KA75420ZTA

Supervisors Overview

The KA75420ZTA is a voltage detector manufactured by onsemi, designed for supervisory circuit applications. It features a single monitored input with an open collector or open drain output type and provides a low-active reset signal. The component operates within a supply voltage range of 300 mV to 15 V. It has a threshold voltage of 4.2 V, with specific under-voltage and over-voltage thresholds at 4.05 V and 4.35 V respectively. The device draws a working power current of 500 uA and supports a maximum power dissipation of 200 mW. It is housed in a TO-92-3 package for through-hole installation and functions reliably across a temperature range of -25 C to +85 C.

Supervisors Feature Summary

• Provides simple reset and power-on reset functionality via a low-active signal.
• Features an open collector or open drain output interface for flexible integration.
• Monitors a single voltage input channel without manual reset or watchdog timer capabilities.

Supervisors Applications

• Voltage supervision in electronic systems requiring power monitoring
• Microprocessor reset circuits for reliable startup sequences
• Battery-powered devices needing under-voltage detection

Supervisors Procurement Notes

Verify the exact suffix ZTA against official documentation to confirm the bulk tape-and-reel packaging configuration. Confirm RoHS compliance status directly from the manufacturer datasheet as regulatory details may vary. Check for obsolescence notices since this product line may be subject to discontinuation. Ensure that the through-hole TO-92-3 package matches your PCB footprint requirements before finalizing procurement decisions.

Supervisors Selection Notes

Select this component when a through-hole voltage supervisor with a fixed 4.2 V threshold is required. The open-drain output allows for wired-OR configurations or compatibility with various logic levels. Consider the 500 uA quiescent current for battery efficiency. Verify that the 15 V maximum supply voltage aligns with your system's operating range. The absence of a watchdog timer simplifies design but requires external implementation if timing protection is needed.

Supervisors Part Context

The KA75420ZTA belongs to the KA75 series of voltage supervisors from onsemi. This family includes variants with different threshold voltages and packages, such as the KA75420ZBU in bulk packaging and the KA75420MTF in surface-mount SOT-89-3 format. All variants share similar electrical characteristics regarding reset functionality and monitoring capabilities, differing primarily in physical packaging and manufacturing lot specifications.

Supervisors Replacement Considerations

KA75420ZBU serves as a direct substitute with identical electrical parameters but differs in packaging quantity and style. KA75420MTF offers the same 4.2 V threshold in a surface-mount SOT-89-3 package for space-constrained designs. Cross-reference datasheets to ensure pinout compatibility and thermal performance match your application requirements.