LM340S-5.0/NOPB

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

The LM340S-5.0/NOPB is a fixed positive linear voltage regulator from the LM340 series, manufactured by Texas Instruments. It provides a stable 5 V output with a maximum current capacity of 1 A. The device operates within an input voltage range of 7.5 V to 35 V and features a TO-263-3 (DDPAK) surface-mount package. Key electrical specifications include a line regulation of 12 mV, load regulation of 25 mV, and a typical power supply rejection ratio of 80 dB at 120 Hz. It supports a junction temperature range from 0°C to +125°C.

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

• Integrated thermal overload protection safeguards against excessive heat generation during operation.
• Built-in short-circuit current limiting protects the device and connected loads from fault conditions.
• Output transistor remains safe under high energy pulse testing scenarios.

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

• General-purpose power supply regulation
• On-card regulation for distributed power systems
• Local voltage regulation in embedded circuits

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

Verify the specific suffix 'NOPB' confirms lead-free and RoHS compliance status as per manufacturer documentation. Confirm the package variant matches the required TO-263-3 footprint for PCB layout compatibility. Ensure input voltage constraints are respected to maintain regulation performance. Cross-reference the datasheet revision date to confirm technical parameters have not changed.

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

Select this component when a robust, single-output 5 V source is required with moderate current demands up to 1 A. The TO-263-3 package offers improved thermal dissipation compared to smaller SMD packages while maintaining surface-mount convenience. Consider the minimum dropout voltage requirements relative to the available input rail headroom.

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

This part belongs to the LM340 family of three-terminal positive regulators, which are direct replacements for the legacy LM309 series. The 'S' designation indicates the surface-mount TO-263 package, distinguishing it from through-hole variants like the LM340T or LM340K. The NOPB suffix denotes environmental compliance without altering functional characteristics.

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

LM340SX-5.0/NOPB serves as a verified alternative within the same product family offering identical electrical specifications and pinout configuration.