KA78RM33TSTU

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The KA78RM33TSTU is a fixed positive low-dropout voltage regulator manufactured by Fairchild Semiconductor, now part of onsemi. It provides a stable 3.3V output with a maximum current capability of 0.5A. The device operates within an input voltage range of 4.3V to 16V and features a maximum dropout voltage of 0.6V at full load. It is housed in a D-PAK surface-mount package with short leads (Rail packing). Key electrical characteristics include a line regulation of 20mV and load regulation of 20mV. The unit supports an operating temperature range from -25°C to +125°C.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Low dropout voltage performance below 0.6V at rated current
• Integrated over-current protection and thermal shutdown circuitry
• Safe Operating Area (SOA) protection for enhanced reliability
• Short circuit protection capabilities

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Constant voltage power sources for electronic equipment
• Battery-powered systems requiring efficient linear regulation
• General-purpose low-dropout regulation in consumer electronics

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the manufacturer origin as this component was originally produced by Fairchild Semiconductor before its acquisition by onsemi. Confirm that the specific ordering suffix TSTU corresponds to the D-PAK package with short leads and rail packing format. Ensure compatibility with existing PCB footprints designed for D-PAK packages. Check for any RoHS compliance documentation if required for your manufacturing standards.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this regulator when a fixed 3.3V output is required with moderate current demands up to 0.5A. It is suitable for applications where space constraints favor surface-mount D-PAK packaging over through-hole alternatives. Consider the thermal resistance of 110 °C/W without a heatsink when designing for high ambient temperatures or continuous full-load operation.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This component belongs to the KA78RM33 series of low-dropout voltage regulators. The series includes variants such as the standard TO-220 version (KA78RM33TU) and other tape-and-reel options like the KA78RM33RTF. The KA78RM33TSTU specifically denotes the D-PAK surface-mount variant with short leads, offering a compact solution for modern printed circuit board designs.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes include the KA78RM33TU (TO-220 package) and KA78RM33RTF (D-PAK Tape & Reel). Verify pinout compatibility and thermal management requirements when switching between package types.