DI78L18UAB

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

The DI78L18UAB is a positive fixed voltage linear regulator from Diotec Semiconductor, housed in an SOT-89 package. It provides a nominal output of 18 V with a tolerance of ±5%, supporting a maximum output current of 0.1 A. The device operates with input voltages up to 40 V and features thermal overload and short circuit protection. Key electrical parameters include a dropout voltage of 1.7 V, quiescent current of 6.5 mA at 25°C, and ripple rejection of 38 dB typical. It functions within a junction temperature range of -40°C to +125°C.

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

• Integrated thermal overload protection for safe operation under high load conditions
• Short circuit protection capability ensures device safety during fault events
• Fixed voltage output eliminates the need for external feedback components

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

• High efficiency linear regulators
• Active SCSI termination regulator
• Post regulators for switch mode DC-DC converters
• Battery backed-up regulated supply

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

Verify the specific ordering suffix against the manufacturer's documentation to confirm compliance requirements. Standard versions are commercial/industrial grade, while suffixes such as -Q indicate AEC-Q100 compliance. Ensure the selected variant matches the required reliability standards for the intended application environment before finalizing procurement.

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

Select this component when a stable 18 V rail is required with a maximum load of 100 mA. The SOT-89 package offers a compact footprint suitable for surface mount designs. Consider the 40 V maximum input rating and 1.7 V dropout voltage to ensure adequate headroom between the input source and the regulated output under all operating conditions.

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

This part belongs to the DI78LxxUAB series of positive fixed voltage regulators manufactured by Diotec Semiconductor. The series includes various output voltage options ranging from 3.3 V to 24 V, all sharing similar electrical characteristics and protection features. The UAB designation specifically denotes the SOT-89 surface mount package variant within this product family.

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

Direct substitutes may include other manufacturers' 78L18 variants in SOT-89 packages, provided they meet the 100 mA output current and 18 V fixed output specifications. Verify pinout compatibility and thermal resistance values to ensure equivalent performance in existing designs.