L78LR05DL-TL-E Equivalent & Substitute Parts

Part Overview

The L78LR05DL-TL-E is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 150mA. This through-hole component operates across an input voltage range up to 20V with a maximum dropout voltage of 2.2V at 40mA. The device includes integrated over-current and over-temperature protection with reset control features.

The L78LR05DL-TL-E is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

L78LR05DL-TL-E

onsemiIn Stock: 1191L78LR05DL-TL-E Datasheet

Current PartRFQ

TPS7A6650QDGNRQ1

Texas InstrumentsIn Stock: 26511TPS7A6650QDGNRQ1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the L78LR05DL-TL-E are identified based on the following critical electrical and mechanical parameters:

• Fixed positive 5V output voltage
• 150mA output current capability
• Over-current and over-temperature protection
• ROHS3 compliance
• Compatible input voltage handling (minimum 20V tolerance)

The TPS7A6650QDGNRQ1 meets these core functional requirements. While it operates with a higher maximum input voltage (40V) and lower dropout voltage (0.45V @ 150mA), these represent performance improvements that maintain backward compatibility with the original design specifications. The substitute part provides additional control features (Enable, Power Good) and protection mechanisms (Short Circuit, UVLO, Watchdog) beyond the original device.

Parameter Comparison

Engineering Selection Recommendations

The TPS7A6650QDGNRQ1 is the qualified substitute for the L78LR05DL-TL-E based on the following criteria:

• Both devices deliver fixed 5V output at 150mA, meeting core functional requirements
• Both maintain ROHS3 compliance and EAR99 ECCN classification
• The substitute part is in active production status, ensuring long-term supply availability
• The TPS7A6650QDGNRQ1 carries AEC-Q100 automotive qualification, providing additional reliability assurance
• Enhanced protection features and wider operating temperature range (-40°C ~ 150°C) in the substitute part exceed original specifications

Design migration from through-hole (5-SSIP) to surface-mount (8-MSOP) packaging requires PCB layout modification. The substitute part's superior dropout voltage performance (0.45V vs. 2.2V) and higher input voltage rating (40V vs. 20V) provide design margin improvements for existing applications.

Frequently Asked Questions (FAQ)

Q: Can the TPS7A6650QDGNRQ1 directly replace the L78LR05DL-TL-E in existing designs?

A: Electrical substitution is valid. Both devices provide fixed 5V output at 150mA with equivalent protection features. However, the packaging differs: the original uses through-hole (5-SSIP) while the substitute uses surface-mount (8-MSOP). PCB redesign is required for physical integration.

Q: What are the key electrical advantages of the TPS7A6650QDGNRQ1?

A: The substitute part offers lower dropout voltage (0.45V @ 150mA vs. 2.2V @ 40mA), higher maximum input voltage rating (40V vs. 20V), extended operating temperature range (-40°C ~ 150°C vs. -30°C ~ 80°C), and additional protection mechanisms including short-circuit protection, UVLO, and watchdog functionality.

Q: Are both parts RoHS compliant?

A: Yes. Both the L78LR05DL-TL-E and TPS7A6650QDGNRQ1 are ROHS3 compliant and REACH unaffected.

Q: Does the substitute part require different circuit design considerations?

A: The TPS7A6650QDGNRQ1 includes Enable and Power Good control features not present in the original device. These are optional to use; the part functions as a fixed regulator without these features activated. Quiescent current is lower (20 µA), potentially improving system efficiency.

Q: What is the significance of the automotive qualification on the substitute part?

A: The TPS7A6650QDGNRQ1 carries AEC-Q100 automotive qualification, indicating compliance with automotive reliability and quality standards. This provides additional assurance for applications requiring enhanced reliability, though it is not mandatory for non-automotive use cases.

Q: Are there supply chain considerations between these parts?

A: The L78LR05DL-TL-E is obsolete with limited remaining inventory. The TPS7A6650QDGNRQ1 is in active production with substantial stock availability, ensuring reliable long-term supply for new designs or production continuity.