L78LR05D-LR-E Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The L78LR05D-LR-E is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 150mA. This device features integrated over-current and over-temperature protection with a reset control function. The part is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and production continuity.

Substiute Parts

L78LR05D-LR-E

onsemiIn Stock: 990L78LR05D-LR-E Datasheet

Current PartRFQ

TPS7A6650QDGNRQ1

Texas InstrumentsIn Stock: 26511TPS7A6650QDGNRQ1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L78LR05D-LR-E is determined by the following critical parameters:

• Output Voltage: Fixed 5V output is mandatory
• Output Current: Minimum 150mA capability required
• Output Configuration: Positive fixed output only
• Protection Features: Over-current and over-temperature protection required
• Functional Compatibility: Reset or enable control capability

The TPS7A6650QDGNRQ1 from Texas Instruments meets these core functional requirements. While this substitute introduces differences in packaging (surface mount vs. through hole), input voltage rating (40V vs. 20V), dropout voltage performance (0.45V vs. 2.2V), and additional control features, the fundamental electrical specifications for 5V/150mA fixed positive output regulation are satisfied.

Parameter Comparison

Engineering Selection Recommendations

The TPS7A6650QDGNRQ1 is an active, production-supported substitute for the obsolete L78LR05D-LR-E. Selection of this substitute is justified by:

• Product Availability: Active status ensures long-term supply and support compared to the obsolete original part
• Compliance: ROHS3 compliant and AEC-Q100 qualified, meeting automotive and environmental standards
• Electrical Equivalence: Identical 5V/150mA fixed output specifications satisfy the core functional requirement
• Enhanced Protection: Additional protection features (short circuit, UVLO, watchdog) provide improved system reliability
• Improved Performance: Lower dropout voltage (0.45V vs. 2.2V) and wider input voltage range (40V vs. 20V) offer design flexibility

Critical Consideration: The substitute requires a change from through-hole to surface-mount packaging. PCB layout and assembly process modifications are necessary.

Frequently Asked Questions (FAQ)

Q: Can the TPS7A6650QDGNRQ1 directly replace the L78LR05D-LR-E in existing designs?

A: Electrical substitution is valid for 5V/150mA fixed output applications. However, the package change from 5-SSIP through-hole to 8-MSOP surface-mount requires PCB redesign and assembly process changes. Pin-to-pin compatibility does not exist.

Q: What are the key differences in electrical performance?

A: The substitute offers superior dropout voltage performance (0.45V @ 150mA vs. 2.2V @ 40mA) and wider maximum input voltage rating (40V vs. 20V). Operating temperature range is also extended (-40°C to 150°C vs. -30°C to 80°C). These differences favor the substitute in most applications.

Q: Are there packaging options for the TPS7A6650QDGNRQ1?

A: The TPS7A6650QDGNRQ1 is supplied in 8-HVSSOP package with Cut Tape (CT) and Digi-Reel® packaging options. No through-hole variant is available for this part number.

Q: Does the substitute include additional protection features?

A: Yes. The TPS7A6650QDGNRQ1 includes short-circuit protection, under-voltage lockout (UVLO), and watchdog functionality in addition to the over-current and over-temperature protection present in the original part.

Q: Is the substitute suitable for automotive applications?

A: Yes. The TPS7A6650QDGNRQ1 carries automotive grade qualification (AEC-Q100) and is ROHS3 compliant, making it suitable for automotive and industrial applications.

Q: What is the quiescent current of the substitute?

A: The TPS7A6650QDGNRQ1 has a quiescent current (Iq) of 20 µA, which is relevant for low-power standby applications.