KA78T15

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

The KA78T15 is a monolithic fixed positive voltage regulator from the KA78TXX family, manufactured by Fairchild Semiconductor and now part of onsemi. It provides a nominal output voltage of 15 V with a tolerance of ±4%. The device is capable of driving loads in excess of 3.0 A and features internal short-circuit current limiting, thermal overload protection, and safe operating area (SOA) compensation. It operates within a junction temperature range of 0 °C to +125 °C and supports a maximum input voltage of 40 V. The component is housed in a TO-220 package.

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

• Internal short circuit current limiting
• Internal thermal overload protection
• Output transistor safe operating area compensation

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

• General-purpose power supply regulation
• Local on-card regulation for switching regulators
• Power supplies for test equipment

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

Verify that the specific ordering suffix matches the required package variant, as the KA78TXX family includes different mechanical options. Confirm manufacturer lineage, noting that Fairchild Semiconductor products are integrated into onsemi's portfolio. Ensure the procurement documentation references the correct datasheet revision to align with electrical characteristics and mechanical dimensions.

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

Select the KA78T15 when a stable 15 V output at currents exceeding 3.0 A is required. Consider the 40 V maximum input voltage limit and the 25 W internal power dissipation capability. Evaluate thermal management requirements based on the junction-to-air thermal resistance, as adequate heat sinking may be necessary to maintain performance under high load conditions.

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

The KA78T15 belongs to the KA78TXX series of three-terminal positive linear regulators. This family offers multiple fixed output voltages, including 5 V, 12 V, and 15 V, all packaged in TO-220. These regulators are designed for applications requiring robust protection features and high current drive capabilities without the need for external components.

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

Equivalent parts include MC78T15 and NTE1918. Verify pinout compatibility and thermal specifications before substitution.