L78LR05D-MA-E Equivalent & Substitute Parts

Part Overview

The L78LR05D-MA-E is a linear voltage regulator IC manufactured by onsemi, designed to deliver a fixed positive 5V output at 150mA. This Surface Mount device in TO-252-5 (DPAK) packaging is classified as obsolete, making identification of suitable substitute components essential for ongoing production and maintenance applications. The part provides basic protection features including over-current and over-temperature safeguards, with a maximum input voltage of 20V and dropout voltage of 2.2V at 40mA.

Substiute Parts

L78LR05D-MA-E

onsemiIn Stock: 807L78LR05D-MA-E Datasheet

Current PartRFQ

TPS7A6650QDGNRQ1

Texas InstrumentsIn Stock: 26511TPS7A6650QDGNRQ1 Datasheet

SimilarRFQ

L78LR05D-FA-E

SanyoIn Stock: 4164L78LR05D-FA-E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the L78LR05D-MA-E are identified based on the following critical parameters that determine functional compatibility:

• Fixed positive 5V output voltage
• 150mA output current capability
• Surface mount packaging
• Over-current and over-temperature protection
• Positive output configuration

Two substitute options are available, each with distinct characteristics:

Parametric Equivalent (L78LR05D-FA-E): Maintains identical electrical specifications and package form factor, differing only in manufacturer (Sanyo) and product status (Active).

Functional Equivalent (TPS7A6650QDGNRQ1): Meets core voltage and current requirements with enhanced specifications, including lower dropout voltage, higher input voltage rating, and expanded protection features. Package form differs (8-TSSOP vs. TO-252-5).

Parameter Comparison

Engineering Selection Recommendations

L78LR05D-FA-E Selection: This parametric equivalent is the direct replacement for the obsolete L78LR05D-MA-E. It maintains identical electrical performance, thermal characteristics, and package footprint. The part is currently in active production status with established supply availability. Selection of this substitute requires no circuit redesign and provides pin-for-pin compatibility. RoHS compliance status differs; verify applicability to your regulatory requirements.

TPS7A6650QDGNRQ1 Selection: This functional equivalent meets the core voltage regulation and current delivery requirements while offering enhanced performance characteristics. The significantly lower dropout voltage (0.45V vs. 2.2V) reduces power dissipation and thermal stress. Higher maximum input voltage (40V vs. 20V) provides greater design margin. Expanded protection features and automotive-grade qualification (AEC-Q100) support applications requiring higher reliability standards. Circuit board redesign is required due to different package geometry (8-TSSOP vs. TO-252-5). This option is suitable for new designs or redesign initiatives where package change is acceptable.

Frequently Asked Questions (FAQ)

Q: Can L78LR05D-FA-E be used as a direct replacement for L78LR05D-MA-E?

A: Yes. The L78LR05D-FA-E is a parametric equivalent with identical output voltage (5V), output current (150mA), dropout voltage (2.2V @ 40mA), operating temperature range (-30°C to 80°C), and TO-252-5 package form factor. Pin configuration and electrical performance are equivalent, enabling direct substitution without circuit modification.

Q: What are the key differences between the two substitute options?

A: L78LR05D-FA-E maintains identical specifications to the main part with different manufacturer and active product status. TPS7A6650QDGNRQ1 offers enhanced performance (lower dropout voltage, higher input voltage rating, expanded protection) but requires different package footprint (8-TSSOP instead of TO-252-5), necessitating PCB redesign.

Q: Does the TPS7A6650QDGNRQ1 require circuit modifications?

A: The TPS7A6650QDGNRQ1 maintains the same output voltage and current specifications, so core circuit functionality remains compatible. However, the different package type (8-TSSOP vs. TO-252-5) requires PCB layout changes. Pin assignments differ; verify pinout compatibility with your schematic before implementation.

Q: What is the impact of the lower dropout voltage in TPS7A6650QDGNRQ1?

A: Lower dropout voltage (0.45V @ 150mA vs. 2.2V @ 40mA) reduces power dissipation in the regulator, resulting in lower junction temperature and reduced thermal management requirements. This is beneficial in power-constrained or thermally limited applications.

Q: Are there supply chain considerations for these substitutes?

A: L78LR05D-FA-E is in active production with established inventory. TPS7A6650QDGNRQ1 is also active with higher inventory levels (26,486 pcs vs. 4,098 pcs). Both parts are RoHS3 compliant and carry EAR99 export classification.