L78LR05EL-TL-E Equivalent & Substitute Parts

Part Overview

The L78LR05EL-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 L78LR05EL-TL-E is classified as obsolete. Due to its discontinued status, identifying functionally equivalent substitute parts is necessary for design continuity, board redesigns, and long-term production support. Substitute parts must maintain compatibility with the fixed 5V output specification and core protection features while accommodating potential differences in packaging, current capacity, and thermal characteristics.

Substiute Parts

L78LR05EL-TL-E

onsemiIn Stock: 951L78LR05EL-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 eligibility for the L78LR05EL-TL-E is determined by the following critical parameters:

• Fixed Output Voltage: Must be 5V
• Output Current Capacity: Must meet or exceed 150mA
• Input Voltage Range: Must accommodate up to 20V maximum input
• Output Configuration: Must be positive fixed output
• Protection Features: Over-current and over-temperature protection required
• Compliance: ROHS3 compliance and EAR99 classification maintained

The substitute parts identified below satisfy these core electrical requirements. However, packaging differences exist: the original part uses through-hole mounting (5-SSIP), while substitute options employ surface-mount technology (TO-252-3 or TO-263). Design integration must account for these mechanical differences.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts maintain ROHS3 compliance and EAR99 classification, ensuring regulatory continuity with the original L78LR05EL-TL-E.

BA178M05FP-E2 and BA78M05FP-E2 (Rohm Semiconductor): Both devices provide 500mA output current, exceeding the original 150mA specification. BA78M05FP-E2 includes over-current and over-temperature protection matching the original design. Both operate across -40°C to 85°C, extending the lower temperature range. These parts use TO-252-3 surface-mount packaging, requiring PCB layout modification from the original through-hole design.

LM340SX-5.0/NOPB (Texas Instruments): This device delivers 1.5A output current with the highest input voltage rating (35V) and widest operating temperature range (0°C to 125°C). It includes over-temperature and short-circuit protection. The TO-263 (DDPAK-3) package provides superior thermal dissipation compared to smaller packages. This option is suitable for applications requiring higher current capacity or extended temperature operation.

Selection should prioritize product status (all substitutes are active), compliance certifications, and mechanical compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can BA178M05FP-E2 directly replace L78LR05EL-TL-E without circuit modification?

A: Electrical substitution is valid—both provide fixed 5V output with adequate current capacity. However, packaging differs: BA178M05FP-E2 uses surface-mount TO-252-3 versus the original through-hole 5-SSIP. PCB layout redesign is required.

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

A: Both are Rohm Semiconductor 5V regulators in TO-252-3 packages with 500mA output. BA78M05FP-E2 includes over-current and over-temperature protection; BA178M05FP-E2 does not list protection features. For applications requiring protection, BA78M05FP-E2 is the preferred choice.

Q: Is LM340SX-5.0/NOPB suitable for low-current applications originally designed for 150mA?

A: Yes. LM340SX-5.0/NOPB operates at any current level up to its 1.5A maximum. Excess current capacity does not degrade performance in lower-current applications. The higher input voltage rating (35V vs. 20V) and extended temperature range provide additional design margin.

Q: What are the thermal considerations when switching from through-hole to surface-mount packages?

A: TO-252-3 (DPAK) and TO-263 (D2PAK) surface-mount packages typically offer better thermal performance than through-hole equivalents due to direct PCB contact. Verify thermal pad design and copper area in PCB layout to ensure adequate heat dissipation for your application's power budget.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. L78LR05EL-TL-E, BA178M05FP-E2, BA78M05FP-E2, and LM340SX-5.0/NOPB are all ROHS3 compliant, maintaining regulatory compatibility for end-use applications.

Q: Can I use these substitutes in designs with input voltages exceeding 20V?

A: BA178M05FP-E2 and BA78M05FP-E2 support up to 25V input; LM340SX-5.0/NOPB supports up to 35V. If your original design operated at 20V maximum, all substitutes are compatible. For higher input voltages, verify the substitute's maximum rating before implementation.