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

Part Overview

The L78LR05D-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 over-current and over-temperature protection features, making it suitable for general-purpose power management applications.

The L78LR05D-TL-E is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

L78LR05D-TL-E

onsemiIn Stock: 3619L78LR05D-TL-E Datasheet

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BA178M05FP-E2

Rohm SemiconductorIn Stock: 63911BA178M05FP-E2 Datasheet

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BA78M05FP-E2

Rohm SemiconductorIn Stock: 84466BA78M05FP-E2 Datasheet

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LM340SX-5.0/NOPB

Texas InstrumentsIn Stock: 19612LM340SX-5.0/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

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

Fixed Output Voltage: All substitute parts must provide a fixed 5V output to maintain circuit compatibility.

Output Current Capability: The original part delivers 150mA. Substitute parts with equal or greater current ratings (500mA, 1.5A) are electrically compatible and provide design margin.

Input Voltage Range: The original part accepts up to 20V. Substitutes with equal or higher maximum input voltage ratings (25V, 35V) maintain or exceed input voltage tolerance.

Output Configuration: All substitutes must provide positive fixed output configuration.

Protection Features: Over-current and over-temperature protection are standard across all listed substitutes, ensuring equivalent safety characteristics.

Mounting and Packaging: The original part uses through-hole mounting (5-SSIP package). Surface-mount alternatives (TO-252-3, TO-263) require PCB redesign but offer functional equivalence. Selection depends on board layout constraints.

Compliance and Status: All substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory standing.

Parameter Comparison

Engineering Selection Recommendations

BA178M05FP-E2 and BA78M05FP-E2 (Rohm Semiconductor): Both parts are active products with higher output current ratings (500mA) and extended input voltage tolerance (25V maximum). BA78M05FP-E2 includes over-current and over-temperature protection matching the original part's safety features. Both require surface-mount PCB redesign due to TO-252-3 packaging. These substitutes are suitable for applications where board layout permits surface-mount implementation and higher current capacity is acceptable.

LM340SX-5.0/NOPB (Texas Instruments): This active product offers the highest output current capability (1.5A) and maximum input voltage rating (35V), providing substantial design margin. The TO-263 (DDPAK-3) package requires surface-mount PCB redesign. Over-temperature and short-circuit protection are included. The extended operating temperature range (0°C ~ 125°C) exceeds the original part's specification. This substitute is appropriate for applications requiring higher current delivery or broader temperature operation.

All three substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory equivalence with the original L78LR05D-TL-E.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the L78LR05D-TL-E with a surface-mount substitute without PCB modification?

A: No. The original L78LR05D-TL-E uses through-hole 5-SSIP packaging, while all listed substitutes employ surface-mount packages (TO-252-3 or TO-263). Direct socket replacement is not possible. PCB redesign is required to accommodate the different package footprint and pin configuration.

Q: Are the substitute parts electrically compatible with the original circuit?

A: Yes, all substitute parts provide fixed 5V output with positive configuration, matching the original part's electrical function. Substitutes with higher current ratings (500mA, 1.5A) are backward-compatible with circuits designed for 150mA operation. Higher input voltage ratings (25V, 35V) provide additional margin compared to the original 20V maximum.

Q: What is the difference between BA178M05FP-E2 and BA78M05FP-E2?

A: Both are Rohm Semiconductor 5V, 500mA regulators in TO-252-3 packages. BA78M05FP-E2 includes over-current and over-temperature protection, while BA178M05FP-E2 does not list protection features. BA78M05FP-E2 is the preferred substitute when protection feature parity with the original part is required.

Q: Which substitute offers the best performance margin?

A: LM340SX-5.0/NOPB provides the highest performance margin with 1.5A output current capability and 35V maximum input voltage rating. It also offers the widest operating temperature range (0°C ~ 125°C). This part is suitable for applications requiring substantial design headroom.

Q: Are all substitutes RoHS and REACH compliant?

A: Yes. All three substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original L78LR05D-TL-E.

Q: Can I use a higher-current substitute in a circuit designed for 150mA?

A: Yes. Higher-current rated regulators (500mA, 1.5A) are fully compatible with circuits designed for lower current operation. The regulator will deliver only the current demanded by the load, up to its rated maximum.